TY - CHAP A1 - Smeets, Mario A1 - Rötzel, Peter T1 - The Moderating Role of Non-Monetary Gamification in Reducing Algorithm Aversion in the Adoption of AI-based Decision Support Systems T2 - ECIS - European Conference on Information Systems N2 - Integrating artificial intelligence (AI) into decision-making processes is key to improving organizational performance. However, trust in AI-based decision support systems (DSSs), similar to other information systems, is important for successful integration. A disruptive phenomenon, “algorithm aversion”, can impede AI trust and, thus, acceptance. Although AI recommendations outperform human recommendations in different decision-making fields, individuals underweight recommendations from AI-based DSSs compared to human decision-makers due to a lack of AI trust. We conducted a lab experiment to investigate the role of AI recommendations in workplace-related tasks, first focusing on the mediating effect of AI trust and the negative impact of algorithm aversion on decision-making performance and the moderating effect of technical competence. Second, we analyzed the ability of gamification to reduce this phenomenon. We provide evidence regarding how to enhance decision-making performance when AI recommendations are deployed and identify countermeasures against algorithm aversion to facilitate the adoption of AI-based DSSs. KW - Decision Support Systems KW - Algorithm Aversion KW - Gamification KW - Künstliche Intelligenz KW - Gamification Y1 - 2024 VL - 2024 IS - 1 ER - TY - CHAP A1 - Sauer, Jonas A1 - Hoppe, Florian A1 - Bruhm, Hartmut T1 - Modellierung des Antriebsstrangs einer Textilmaschine zum Zweck der modellbasierten Steuerung T2 - Tagungsband AALE 2024, 20. Konferenz N2 - Zur Produktion von gewirkten Textilien werden mehrere Nadeln auf eine Legebarre gesetzt, die durch Servoantriebe positioniert werden. Aufgrund der erzwungenen Bewegung kann der Antriebsstrang bei hohen Drehzahlen zur Schwingung angeregt werden. Die richtige Wahl der Steuerkurven ist daher eine sehr wichtige und anspruchsvolle Aufgabe, die durch ein Antriebsstrangmodell unterstützt werden soll. Dafür wird am Beispiel eines Teststands ein Modell des Antriebsstranges in MATLAB/Simulink® entwickelt. Für das Antriebsstrangmodell müssen eine geeignete Modellordnung und Modellparameter gewählt werden. Die unbekannten Modellparameter werden durch eine Parameteridentifikation ermittelt. Mit einer Validierung wird ein geeignetes Anregungsspektrum für die Bestimmung der Modellordnung und die Parameteridentifikation ermittelt. KW - Textilmaschine KW - Triebstrang KW - MATLAB KW - SIMULINK KW - Modellierung KW - Grey-Box-Modell KW - Parameteridentifikation KW - MATLAB/ Simulink® KW - Inverses Modell KW - Input Shaping Y1 - 2024 U6 - https://doi.org/https://doi.org/10.33968/2024.33 VL - 2024 ER - TY - BOOK A1 - Leimeister, Katja A1 - Schumacher, Meike A1 - Wenderoth, Lucia ED - Hofmann, Georg Rainer ED - Alm, Wolfgang T1 - Krisen und Auswege : Ringvorlesung im Wintersemester 2022/2023 an der TH Aschaffenburg N2 - Krisen gab es schon immer. Aktuell hat sich jedoch ein ganzes Spektrum an Krisen entfaltet – es gibt politische und militärische Krisen, es brechen Energiemärke und Lieferketten weg, wir sehen ganze Branchen gefährdet, auch die Gesundheit macht uns Sorgen, vom Klimawandel ganz zu schweigen. In den Veranstaltungen der Ringvorlesung „Krisen und Auswege“, die im Wintersemester 2022/2023 stattfand, wurden Phänomene, Konzepte und Lösungen aus vielfältiger Perspektive erschlossen und damit die Komplexität des Gegenstands aufgezeigt. Herausforderungen für Unternehmen und Privatpersonen wurden identifiziert sowie der Einfluss auf technologische und organisatorische Entwicklungswege dargelegt. In dieser Publikation wurden die einzelnen Vorträge der Ringvorlesung von den Autorinnen zusammengefasst. KW - Nachhaltigkeit KW - Lieferketten KW - Energiemärkte KW - Mobilität KW - Gesundheitssystem KW - Krise KW - Energiemarkt KW - Klimaänderung KW - Supply Chain Management Y1 - 2023 UR - https://www.mainproject.eu/shop SN - 978-3-9823413-6-1 PB - IMI Verlag, TH Aschaffenburg CY - Aschaffenburg ER - TY - RPRT A1 - Alm, Wolfgang A1 - Hofmann, Georg Rainer A1 - Reuter, Carsten A1 - Ruppert, Erich A1 - Schumacher, Meike A1 - Leimeister, Katja A1 - Schmitt, Joachim A1 - Wenderoth, Lucia T1 - 15 Jahre Wissenstransfer am Information Management Institut (IMI) N2 - Im Sommer des Jahres 2022 hatte der Bayerische Landtag das neue Hochschulinnovationsgesetz (BayHIG) verabschiedet. Darin ist erstmals der Wissenstransfer als die dritte, neue Säule der Hochschulaufgaben enthalten. Tatsächlich hat sich das IMI bereits seit 15 Jahren dem Wissenstransfer Hochschule - Wirtschaft verschrieben und zahlreiche Projekte mit unterschiedlichem Fokus erfolgreich durchgeführt. In der vorliegenden Publikation werden die bearbeiteten Themen im Wissenstransfer, die zahlreichen verschiedenen Veranstaltungsformate sowie die Drittmittelprojekte beleuchtet. KW - Europäischer Sozialfonds, Drittmittel KW - Informationsmanagement KW - Wissenschaftstransfer Y1 - 2023 UR - https://www.mainproject.eu/shop ER - TY - BOOK A1 - Hofmann, Georg Rainer ED - Alm, Wolfgang ED - Hofmann, Georg Rainer T1 - Vertrauen als ein Verhältnis zwischen Menschen und Maschinen N2 - Der technische Fortschritt von IT-Systemen, wie zum Beispiel der sogenannten „Künstlichen Intelligenz“ (KI) oder den „Common Data Spaces“ (CDSs), bringt die Frage nach der Akzeptanz dieser Systeme mit sich. Sowohl die aktive (ökonomische) Akzeptanz in Form des Erwerbs und der Nutzung, als auch die passive (soziale) Akzeptanz in Form der Duldung der aktiven Nutzung durch Dritte, sind für den Erfolg von IT-Systemen ausschlaggebend. Eine geringe Akzeptanz der Systeme und ein mangelndes Vertrauen in dieselben wird in einen Zusammenhang gebracht: Man fragt nach der Gestaltung „zuverlässiger und vertrauenswürdiger Systeme“, da diese besonders akzeptiert werden. In diesem Beitrag werden „Vertrauen“ und dessen Zusammenhang mit „Zuverlässigkeit“ und „Verstehen“ im Kontext von IT-Systemen erörtert. KW - KI KW - Vertrauen KW - Akzeptanz KW - Künstliche Intelligenz Y1 - 2023 UR - https://www.mainproject.eu/shop SN - 978-3-9823413-7-8 PB - IMI Verlag, TH Aschaffenburg CY - Aschaffenburg ER - TY - JOUR A1 - Lutz, Christian A1 - Helm, Jonas A1 - Tschirpke, Katrin A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Drilling Sequence Optimization Using Evolutionary Algorithms to Reduce Heat Accumulation for Femtosecond Laser Drilling with Multi-Spot Beam Profiles JF - MDPI Materials N2 - We report on laser drilling borehole arrays using ultrashort pulsed lasers with a particular focus on reducing the inadvertent heat accumulation across the workpiece by optimizing the drilling sequence. For the optimization, evolutionary algorithms are used and their results are verified by thermal simulation using Comsol and experimentally evaluated using a thermal imaging camera. To enhance process efficiency in terms of boreholes drilled per second, multi-spot approaches are employed using a spatial light modulator. However, as higher temperatures occur across the workpiece when using simultaneous multi-spot drilling as compared to a single-spot process, a subtle spatial distribution and sequence of the multi-spot approach has to be selected in order to limit the resulting local heat input over the processing time. Different optimization approaches based on evolutionary algorithms aid to select those drilling sequences which allow for the combination of a high efficiency of multi-spot profiles, a low-generated process temperature and a high-component quality. In particular, using a 4 x 4 laser spot array allows for the drilling of 40,000 boreholes in less than 76 s (526 boreholes/s) with a reduced temperature increase by about 35%, as compared to a single spot process when employing an optimized drilling sequence. KW - USP laser processing KW - Laser drilling KW - Optimization of heat accumulation KW - Evolutionary Algorithms KW - Thermal simualtions KW - Laserbohren KW - Ultrakurzzeitlaser Y1 - 2023 UR - https://www.mdpi.com/1996-1944/16/17/5775 U6 - https://doi.org/10.3390/ma16175775 VL - 2023 IS - 16/5775 SP - 1 EP - 12 ER - TY - JOUR A1 - Lutz, Christian A1 - Schwarz, Simon A1 - Marx, Jan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Multi-Bessel Beams Generated by an Axicon and a Spatial Light Modulator for Drilling Applications JF - MDPI Photonics N2 - We report on an optical setup to generate multi-Bessel beam profiles combining a refractive axicon and a spatial light modulator. Based on their particular beam profile, Bessel beams offer advantageous properties for micro drilling processes and internal volume processing, especially for transparent materials. In addition, the laser power of industrial, ultrashort pulsed lasers has increased significantly over the last few years, offering the possibility for highly efficient processes using multi-spot profiles. Our optical concept combines the dynamic possibilities of beam splitting using a spatial light modulator with the benefits of Bessel beams, which facilitates multi-Bessel beam processing. Beside the simulation and experimental evaluation of the generated multi-Bessel beams, we exemplify the applicability of the developed module for the perforation of thin metal foils by micro drilling. KW - Bessel beam KW - Axicon KW - Optical System KW - Ultrashort pulsed laser KW - Material ablation KW - Bessel-Bündel KW - Ultrakurzzeitlaser Y1 - 2023 UR - https://www.mdpi.com/2304-6732/10/4/413 U6 - https://doi.org/10.3390/photonics10040413 VL - 2023 IS - 10/413 SP - 1 EP - 9 ER - TY - JOUR A1 - Sommer, David A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Static and Dynamic Mechanical Behaviour of Hybrid-PBF-LB/M-Built and Hot Isostatic Pressed Lattice Structures JF - Mechanical Properties of Polymeric, Metallic, and Composite Materials N2 - We report on a comprehensive study of the mechanical properties of maraging steel body-centred cubic lattice structures fabricated by a hybrid additive manufacturing technology that combines laser powder bed fusion with in situ high-speed milling. As the mechanical properties of additive manufactured components are inferior to, e.g., cast components, surface modifications can improve the mechanical behaviour. Different hybrid additive manufacturing technologies have been designed using additive and subtractive processes, improving process quality. Following this, mechanical testing is performed with respect to static tensile properties and dynamic stress, hardness, and porosity, comparing specimens manufactured by laser powder bed fusion only to those manufactured by the hybrid approach. In addition, the influence of different heat-treatment techniques on the mechanical behaviour of the lattice structures is investigated, namely solution and aging treatment as well as hot isostatic pressing. Thus, the influence of the superior surface quality due to the hybrid approach is evaluated, leading to, e.g., an offset of about 14–16% for the static testing of HIP lattice structures. Furthermore, the dynamic load behaviour can be improved with a finished surface, heading to a shift of the different zones of fatigue behaviour in the testing of hybrid-built specimens. KW - Hybrid additive manufacturing KW - Lattice structures KW - Hot isostatic pressing KW - Fatigue behaviour KW - Isostatisches Heißpressen KW - Selektives Laserschmelzen Y1 - 2023 UR - https://www.mdpi.com/1996-1944/16/9/3556 U6 - https://doi.org/https://doi.org/10.3390/ma16093556 VL - 16 IS - 9 SP - 1 EP - 14 ER - TY - CHAP A1 - Marx, Jan A1 - Esen, Cemal A1 - Lutz, Christian A1 - Hellmann, Ralf A1 - Ostendorf, Andreas T1 - Holographic tuning of physical axicons N2 - Axicon generated Bessel beams are a popular tool for high aspect ratio precision laser drilling. Spot diameter and working distance are given by the geometric parameters of the axicon and the wavelength used. Thus, it is difficult to manipulate the beam shape of a Bessel beam for a given setup. Spatial light modulators (SLMs) overcome limitations in flexibility. However, due to the limited phase shift of SLMs, only Bessel beams with flat cone angles and large focal length can be generated. In this contribution, an approach for generating Bessel beams with a shorter, but tunable focal length is presented. A physical axicon was combined with an SLM. A holographic image of a negative axicon is put on the SLM to generate a ring beam, which is focused by a subsequent physical axicon to get a small focal diameter. Thus, different sized high aspect ratio micro holes can be drilled without using any moving components. KW - Bessel beam KW - Micro drilling KW - Axicon KW - Spatial light modulator KW - Beam shaping KW - Bessel-Bündel KW - Axicon KW - Strahlformung, Laser Y1 - 2023 VL - 2023 IS - 154 SP - 1 EP - 9 PB - LiM 2023 Proceedings ER - TY - JOUR A1 - Flachs, Dennis A1 - Zhukov, Sergey A1 - Zech, Isabella A1 - Schreck, Timo A1 - Belle, Stefan A1 - von Seggern, Heiinz A1 - Kupnik, Mario A1 - Altmann, Alexander Anton A1 - Thielemann, Christiane T1 - Enzymatic Self-Degradable PLA-Based Electrets JF - Journal of Polymers and the Environment N2 - In recent years, the demand for sustainable and degradable materials and electronic devices has increased significantly. Among a range of biodegradable polymers, poly(lactic acid) (PLA) is a good alternative to conventional petrol-based polymers because of its attractive mechanical properties and its easy processability. Recently, PLA has also been described as a promising dielectric material with piezoelectric and electret properties. We expect that PLA—after further optimization— will play an important role as a material for environmentally friendly sensors in the future, where first applications such as air filters and pressure sensors have already been proposed. However, degradation under normal ambient conditions is very slow, and an accelerated and controllable degradation process is highly desirable for any type of PLA-based sensors. Enzymatic hydrolysis with embedded enzymes has been proposed as an approach to accelerate and control degradation. In this work, we investigate the properties of PLA in terms of dielectric and mechanical properties with a focus on its ability to store charges after the enzyme proteinase K (Trit. album) has been incorporated. Results reveal that proteinase K has a positive effect on the charge stability of solvent-cast PLA electrets after complete evaporation of the solvent. Furthermore, we observed a concentration-dependent acceleration of mass loss in a Tris-HCl buffer. A fast degradation within only one day occurred at a concentration of 6 wt% proteinase K. KW - Biologisch abbaubarer Kunststoff Y1 - 2024 U6 - https://doi.org/Journal of https://doi.org/10.1007/s10924-024-03240-6 VL - 2024 IS - 1 SP - 1 EP - 11 ER - TY - CHAP A1 - Sauer, Timm A1 - Gorks, Manuel A1 - Spielmann, Luca A1 - Hepp, Nils A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - AI-based control approaches for lateral vehicle guidance of industrial trucks T2 - IFAC WC 2023 – The 22nd World Congress of the International Federation of Automatic Control 2023, Yokohama, Japan, 09.07.2023 - 14.07.2023 N2 - Two different control concepts for the automatic track guidance of forklifts are proposed. Both approaches are based on Reinforcement Learning (RL), a method of Artificial Intelligence (AI), and are able to take into account time-variant parameters, such as the vehicle velocity, and to reduce the influence of the path curvature, the most important disturbance variable of lateral vehicle control. In the first approach, both, the path curvature and the vehicle velocity signal, are provided to the controller in addition to the state variables of the controlled system. By varying the corresponding parameters in the training process, both signals can be considered and the control parameters can be optimized accordingly. In the second approach, several controllers (multi-model concept) considering the path curvature are used and the varying vehicle velocity is taken into account using a gain-scheduling concept. Considering time-variant vehicle parameters and the influence of the disturbance variable during operation, a stable track guidance is guaranteed within the whole speed range of the industrial trucks. KW - Artificial intelligence, Lateral vehicle control, Intelligent transportation systems KW - Flurförderer KW - Künstliche Intelligenz Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S2405896323019092 U6 - https://doi.org/https://doi.org/10.1016/j.ifacol.2023.10.1501. ER - TY - JOUR A1 - Balleis, Kristina A1 - Wagner, Stefan T1 - Haftung für Wildschäden in gemeinschaftlichen Jagdbezirken JF - Zeitschrift für Jagdwissenschaft KW - Jagdrecht KW - Forstrecht Y1 - 1998 VL - 44 IS - Juni SP - 85 EP - 93 ER - TY - JOUR A1 - Balleis, Kristina T1 - Keine Heilbarkeit eines Mangels unzureichender interkommunaler Abstimmung im ergänzenden Verfahren nach §215 a BauGB, Urteilsbesprechung JF - Verwaltungsrecht für die Anwaltspraxis KW - Deutschland, Baugesetzbuch KW - Kommunale Zusammenarbeit Y1 - 2000 VL - 2000 IS - 6 SP - 192 EP - 192 ER - TY - JOUR A1 - Balleis, Kristina T1 - Rechtswidrigkeit einer Vorkaufssatzung zur Sicherung städtebaulicher Entwicklung, Urteilsbesprechung JF - Verwaltungsrecht für die Anwaltspraxis KW - Stadtentwicklung KW - Vorkaufsrecht KW - Rechtswidrigkeit Y1 - 2000 VL - 2000 IS - 5 SP - 155 EP - 155 ER - TY - JOUR A1 - Balleis, Kristina T1 - Zulässigkeit und Notwendigkeit einer landesgesetzlichen Verbandsklage im Wasserrecht JF - Recht der Natur / Schnellbrief KW - Verbandsklage KW - Wasserrecht Y1 - 1997 VL - 1997 IS - 47 SP - 18 EP - 19 ER - TY - BOOK A1 - Balleis, Kristina A1 - Schraml, Ulrich A1 - Wagner, Stefan T1 - Jagdrecht und Verbandsklage : aktuelle Fragen des Jagdrechts und der Mitwirkungs- und Klagerechte von Naturschutzverbänden im Wasserrecht KW - Verbandsklage KW - Jagdrecht KW - Wasserrecht Y1 - 1997 SN - 3-932374-01-0 PB - RIWA-Verlag CY - Augsburg ER - TY - BOOK A1 - Balleis, Kristina A1 - Bieling, Alfons A1 - Hufnagl, Natalie A1 - Kleinschmit von Lengefeld, Andreas A1 - Riehtmüller, Anne A1 - Röhrscheid, Stefan A1 - Suda, Michael A1 - Timinger, Michael A1 - Wagner, Stefan A1 - Wiegmann, Stefanie T1 - Rechtliche und fachliche Aspekte des Erhalts schützenswerter Wälder KW - Forstschutz KW - Waldpflege KW - Forstrecht Y1 - 1995 PB - Fachverband Forst CY - Augsburg ER - TY - BOOK A1 - Wörlen, Rainer A1 - Metzler-Müller, Karin A1 - Kokemoor, Axel A1 - Balleis, Kristina T1 - Schuldrecht BT KW - Deutschland KW - Schuldrecht KW - Besonderer Teil Y1 - 2022 SN - 978-3-8006-6546-4 PB - Vahlen CY - München ER - TY - BOOK A1 - Wörlen, Rainer A1 - Metzler-Müller, Karin A1 - Balleis, Kristina A1 - Kokemoor, Axel T1 - BGB AT KW - Deutschland KW - Bürgerliches Recht KW - Allgemeiner Teil Y1 - 2023 SN - 978-3-8006-6833-5 PB - Vahlen CY - München ER - TY - BOOK A1 - Wörlen, Rainer A1 - Metzler-Müller, Karin A1 - Balleis, Kristina A1 - Kokemoor, Axel T1 - Schuldrecht AT KW - Deutschland KW - Schuldrecht KW - Allgemeiner Teil Y1 - 2023 SN - 978-3-8006-7242-4 PB - Vahlen CY - München ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - Information Overload in Decision Support Systems T2 - International Symposium on Accounting Information Systems KW - Information Overload KW - Information Systems KW - Controlling KW - Entscheidungsunterstützungssystem KW - Information KW - Überlastung Y1 - 0024 VL - 2024 CY - Paphos ER - TY - JOUR A1 - Gvozdovskyy, Igor A1 - Bratova, Daria A1 - Kazantseva, Z. A1 - Malyuta, S. A1 - Lytvyn, Petro A1 - Schwarz, Simon A1 - Hellmann, Ralf T1 - Light-controllable hybrid aligning layer based on LIPSS on sapphire surface and PVCN-F film JF - Journal of Molecular Liquids N2 - The creation of aligning layers for the uniform orientation of liquid crystals is significant for both research and the application of liquid crystals. For all applications, the creation of aligning layers possessing controllable characteristics such as azimuthal and polar anchoring energies, easy-axis of director alignment and pretilt angle, in the same way as it is achieved by using photoaligning layers processed by light, is very important. Here, aligning properties of hybrid aligning layers created on the basis of sapphire surfaces additionally coated by photoaligning layer of PVCN-F are studied. These hybrid layers possess the properties of the nano-structured sapphire layer and the photosensitive PVCN-F layer, and complement each other. The irradiation time dependence of the azimuthal anchoring energy of the hybrid layers is studied. By using certain experimental conditions during irradiation of hybrid layers, e.g., polarization of light and irradiation time, a minimum value of the azimuthal anchoring energy, close to zero, was obtained. Atomic force microscope studies of the irradiated hybrid layers were also carried out. It was found that the behavior of the contact angle of nematic droplets placed on treated sapphire surfaces are in good agreement with properties of hybrid aligning layers and parameters of structuring surface obtained from AFM images. KW - Flüssigkristall KW - Saphir KW - Kristallfläche Y1 - 2023 U6 - https://doi.org/10.1016/j.molliq.2023.122623 VL - 387 IS - keine SP - 122623 EP - 122623 ER - TY - BOOK A1 - Borgeest, Kai T1 - 内燃机测量技术和试验台架 KW - Verbrennungsmotor KW - Prüfstand KW - Verbrennungsanalyse KW - Abgasemission KW - internal combustion engines KW - engine testing KW - exhaust gas analysis KW - combustion analysis Y1 - 2023 SN - 978-7-111-71807-9 PB - China Machine Press ER - TY - JOUR A1 - Häfner, Tom A1 - Bischoff, Kay A1 - Helm, Jonas A1 - Kunz, Tim A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - KEINE FREISCHALTUNG - Urheberrecht 0 bei Dokument mit Volltext Picosecond laser microvia drilling of ABF material using MHz burst mode JF - Materials Research Express N2 - We report on a comprehensive study of laser percussion microvia drilling of Ajinomoto build-up film (ABF) material using an ultrashort pulsed laser in MHz burst mode. After laser processing, microvia drilling quality is being evaluated by the fabricated diameter and taper using laser scanning microscopy and metallography. The influences of the incubation effect, heat accumulation and shielding effects as a result of pulse to pulse interactions are being discussed on the ablation threshold, penetration depth and laser microvia drilling quality. We find that an increasing heat accumulation in MHz burst mode processing is responsible for the void formation and delamination of the insulating ABF layer. Therefore, the parameter clearance is introduced to evaluate these effects on the microvia sidewalls. For a comparable clearance, applying 2 intra-burst pulses achieves an average reduced taper of down to 19.5% compared to single pulse mode. At the same time, a reduced laser drilling time of 16.7% per microvia highlights the enormous potential of the MHz burst mode for laser drilling of ABF material in printed circuit board fabrication. KW - Ultrakurzzeitlaser KW - Pikosekundenbereich Y1 - 2023 VL - 10 IS - 9 SP - 096301 EP - 096311 ER - TY - JOUR A1 - Zettl, Julian A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fundamental Considerations and Analysis of the Energy Distribution in Laser Turning with Ultrashort Laser Pulses JF - mdpi Micromachines N2 - This article discusses the process of the laser turning of rotational symmetric, cylindrical components using ultrashort laser pulses with respect to the geometrical conditions and the resulting energy distribution during the laser turning process. As a result, process predictions and potential process optimizations are feasible. Particular attention is drawn to the laser spot formation on the cylindrical surface of the work piece in conjunction with the positioning of the laser beam relative to the rotation axis of the specimen. Based on fundamental calculations and experimental results, an optimum processing strategy is discussed, whereat the use of a trepanning optic in the laser turning process and the forming of a particular surface structure is additionally being issued. KW - ultrashort pulse laser KW - laser turning KW - tangential processing KW - trepanning optic KW - Ultrakurzzeitlaser Y1 - 2023 UR - https://www.mdpi.com/2072-666X/14/10/1838 U6 - https://doi.org/10.3390/mi14101838 VL - 14 IS - 10 SP - 1 EP - 15 ER - TY - CHAP A1 - Bischoff, Kay A1 - Mücke, Dominik A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - UV-Femtosecond-Laser Structuring of Silicon Carbide T2 - International Congress on Applications of Lasers & Electro-Optics (ICALEO) 2023 N2 - We report on ultraviolet ultrashort pulsed laser processing of silicon carbide. Laser ablated cavities are evaluated with respect to their ablation rates, surface roughness and overall quality by varying the laser pulse fluence. Using this type of laser, high edge quality and surface roughness down to 107 nm can be achieved with an ablation efficiency of up to 0.228 mm 3 W −1 min −1. Functional surfaces are produced by generating laser induced periodic surface structures. The comparison with infrared wavelength underlines the advantages of the ultraviolet wavelength for laser micro machining this material. Significant differences with respect to the measured ablation depths and roughness as well as generated micro-and nanostructures appear. While infrared ablation is dominated by a chipping mechanism above a critical fluence of 9.93 Jcm −2 , higher ablation rates are observed with strong quality losses at the same time. In comparison to the infrared emission wavelength, in general , a significantly higher processing quality is achieved with the ultraviolet emission wavelength. In addition, the influence of spot size and repetition rate in UV processing is investigated. By increasing these parameters, a process acceleration without quality losses is enabled. The generation of a sophisticated microstructure exemplifies the advantages of processing silicon carbide with the UV laser reported here. KW - Femtosekundenlaser KW - Siliciumcarbid Y1 - 2023 ER - TY - CHAP A1 - Bischoff, Kay A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Acceleration of Femtosecond Reductive Laser Sintering of Copper(II) Oxide for Conductive Copper Patterns on Cyclic Olefin Copolymers T2 - International Congress on Applications of Lasers & Electro-Optics (ICALEO) 2023 N2 - We report on the acceleration of femtosecond reductive laser sintering of copper (II) oxide on the surface of transparent cyclic olefin copolymers (COC) by varying the focus size to generate metallic copper (Cu) layers. By using different focusing conditions, different process speeds are achieved, and the structural accuracies are controlled. The formation of Cu lines is observed for different focus sizes at various scan speeds, which is attributed to laser exposure duration and chemical reaction time. The formed lines are categorized and measured by optical microscopy and provide the basis for two-dimensional Cu surfaces. By hatching, high quality conductive films are produced with an increased focus diameter of up to 400 µm at a scan speed of 400 mm/s and a hatch distance of 250 µm resulting in a multiple increased process speed by a factor of thirteen compared to previous research. Using 4-tip measurement , a low sheet resistance of 0.165 Ω/sq was validated on these Cu films, which have an atomic Cu content of 89.5%. KW - Femtosekundenlaser Y1 - 2023 ER - TY - JOUR A1 - Dobrovolskij, Dascha A1 - Stark, Hans-Georg T1 - Synthetic demand data generation for individual electricity consumers: Inpainting JF - Energy and AI N2 - In this contribution we deal with the problem of producing “reasonable” data, when considering recorded energy consumption data, which are at certain sections incomplete and/or erroneous. This task is important, when energy providers employ prediction models for expected energy consumption, which are based on past recorded consumption data, which then of course should be reliable and valid. In a related contribution Yilmaz (2022), GAN-based methods for producing such “artificial data” have been investigated. In this contribution, we describe an alternative and complementary method based on signal inpainting, which has been successfully applied to audio processing Lieb and Stark (2018). After giving a short overview of the theory of proximity-based convex optimization, we describe and adapt an iterative inpainting scheme to our problem. The usefulness of this approach is demonstrated by analyzing real-world-data provided by a German energy supplier. KW - Energieverbrauch KW - Energieversorgungsunternehmen Y1 - 2024 VL - 15 IS - Januar 2024 SP - 100312 EP - 100320 ER - TY - JOUR A1 - Lieb, Florian A1 - Knopp, Tobias T1 - A wavelet-based sparse row-action method for image reconstruction in magnetic particle imaging JF - Medical Physics N2 - Purpose Magnetic particle imaging (MPI) is a preclinical imaging technique capable of visualizing the spatio-temporal distribution of magnetic nanoparticles. The image reconstruction of this fast and dynamic process relies on efficiently solving an ill-posed inverse problem. Current approaches to reconstruct the tracer concentration from its measurements are either adapted to image characteristics of MPI but suffer from higher computational complexity and slower convergence or are fast but lack in the image quality of the reconstructed images. Methods In this work we propose a novel MPI reconstruction method to combine the advantages of both approaches into a single algorithm. The underlying sparsity prior is based on an undecimated wavelet transform and is integrated into a fast row-action framework to solve the corresponding MPI minimization problem. Results Its performance is numerically evaluated against a classical FISTA (Fast Iterative Shrinkage-Thresholding Algorithm) approach on simulated and real MPI data. The experimental results show that the proposed method increases image quality with significantly reduced computation times. Conclusions In comparison to state-of-the-art MPI reconstruction methods, our approach shows better reconstruction results and at the same time accelerates the convergence rate of the underlying row-action algorithm. KW - Wavelet KW - Bildgebendes Verfahren KW - Magnetpartikelbildgebung Y1 - 2021 UR - https://doi.org/10.1002/mp.14938 VL - 48 IS - 7 SP - 3893 EP - 3903 ER - TY - JOUR A1 - Bischoff, Kay A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Preparation of Dispersed Copper(II) Oxide Nanosuspensions as Precursor for Femtosecond Reductive Laser Sintering by High-Energy Ball Milling JF - Nanomaterials N2 - This contribution demonstrates and discusses the preparation of finely dispersed copper(II) oxide nanosuspensions as precursors for reductive laser sintering (RLS). Since the presence of agglomerates interferes with the various RLS sub-processes, fine dispersion is required, and oversized particles must be identified by a measurement methodology. Aside from the established method of scanning electron microscopy for imaging individual dried particles, this work applies the holistic and statistically more significant laser diffraction in combination with dynamic image analysis in wet dispersion. In addition to direct ultrasonic homogenization, high-energy ball milling is introduced for RLS, to produce stable nanosuspensions with a high fine fraction, and, above all, the absence of oversize particles. Whereas ultrasonic dispersion stagnates at particle sizes between 500 nm and 20 μm, even after 8 h, milled suspension contains a high proportion of finest particles with diameters below 100 nm, no agglomerates larger than 1 μm and a trimodal particle size distribution with the median at 50 nm already, after 100 min of milling. The precursor layers produced by doctor blade coating are examined for their quality by laser scanning microscopy. The surface roughness of such a dry film can be reduced from 1.26 μm to 88 nm by milling. Finally, the novel precursor is used for femtosecond RLS, to produce homogeneous, high-quality copper layers with a sheet resistance of 0.28 Ω/sq and a copper mass concentration of 94.2%. KW - Laserstrahlsintern KW - Femtosekundenlaser Y1 - 2023 U6 - https://doi.org/https://doi.org/10.3390/nano13192693 VL - 13 IS - 19 SP - 2693 EP - 2693 ER - TY - JOUR A1 - Bischoff, Kay A1 - Kefer, Stefan A1 - Wienke, Alexander A1 - Overmeyer, Ludger A1 - Kaierle, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Integration of Bragg gratings in aerosol-jetted polymer optical waveguides for strain monitoring capabilities JF - Optics Letters N2 - We demonstrate and discuss the integration of Bragg gratings in aerosol-jetted polymer optical waveguides, produced in the optical assembly and connection technology for component-integrated bus systems (OPTAVER) process. By using a femtosecond laser and adaptive beam shaping, an elliptical focal voxel generates different types of single pulse modification by nonlinear absorption in the waveguide material, which are arranged periodically to form Bragg gratings. Integration of a single grating structure or, alternatively, an array of Bragg grating structures in the multimode waveguide yields a pronounced reflection signal with typical multimodal properties, i.e., a number of reflection peaks with non-Gaussian shapes. However, the main wavelength of reflection, located around 1555 nm, is evaluable by means of an appropriate smoothing algorithm. When loaded by mechanical bending, a pronounced Bragg wavelength shift of this reflected peak up to 160 pm is detected. This demonstrates that the additively manufactured waveguides can be used not only for signal transmission but also as a sensor. KW - Bragg-Reflektor KW - Lichtwellenleiter Y1 - 2023 U6 - https://doi.org/https://doi.org/10.1364/OL.481801 VL - 48 IS - 7 SP - 1778 EP - 1781 ER - TY - CHAP A1 - Franz, Daniel A1 - Mücke, Dominik A1 - Kunz, Tim A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - UV picosecond laser drilling of ABF film material for printed circuit boards using laser burst mode and beam shaping T2 - International Congress on Applications of Lasers & Electro-Optics (ICALEO) 2023 N2 - We report on an experimental study of laser microvia percussion drilling of Ajinomoto build-up film (ABF) material using an ultrashort pulsed laser in the ultraviolet region. In order to optimize the drilling quality in terms of the fabricated taper and microvia diameter, the MHz burst mode is used in combination with both a Gaussian and a top-hat laser intensity distribution. To evaluate the influence of the top-hat beam shape on defocusing, microvias were drilled at different z-positions in the range of 200 μm evenly distributed around the focal plane. The drilling quality was evaluated by laser scanning microscopy and metallography. When using a top-hat beam shape, a reduced taper of down to 26.8 % on average is achieved compared to a Gaussian beam. For the application of 3 intra-burst pulses, we find an improvement of the taper by 11.6% compared to the single pulse mode due to the increasing heat accumulation. Using a top-hat beam shape in combination with the MHz burst mode, an 18.2 % reduction in laser drilling time for a microvia with a similar taper is remarkable, demonstrating the high potential for scaling throughput in electronics manufacturing. KW - Pikosekundenbereich KW - Laserbohren Y1 - 2023 ER - TY - JOUR A1 - Bischoff, Kay A1 - Mücke, Dominik A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer JF - Polymers N2 - We report on the laser ablation of cyclic olefin copolymer using an amplified ultrashort pulsed laser in the ultraviolet spectral range. In addition to a high ablation depth per laser-structured layer up to 74 μm at a fluence of 22 J cm−2, an excellent mean roughness 𝑅𝑎 of laser-patterned surfaces down to 0.5 μm is demonstrated. Furthermore, with increasing fluence, increasing ablation efficiencies up to 2.5 mm3 W−1 min−1 are determined. Regarding the quality of the ablation, we observed steep ablation flanks and low debris formation, though for fluences above 10.5 J cm−2 the formation of troughs was observed, being attributed to multiple reflections on the ablation flanks. For comparison, laser ablation was performed under identical conditions with an infrared laser wavelength. The results highlight that UV ablation exhibits significant advantages in terms of ablation efficiency, surface roughness and quality. Moreover, our results show that a larger UV focus spot accelerates the ablation process with comparable quality, paving the way for high-power UV ultrashort pulsed lasers towards an efficient and qualitative tool for the laser machining of cyclic olefin copolymer. The production of complex microfluidics further underlines the suitability of this type of laser. KW - Femtosekundenlaser Y1 - 2022 U6 - https://doi.org/https://doi.org/10.3390/polym14142962 VL - 14 IS - 14 SP - 2962 EP - 2962 ER - TY - JOUR A1 - Franz, Daniel A1 - Yang, Yongting A1 - Michel, Luis A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Evaluation of an ultrashort pulsed laser robot system for flexible and large-area micromachining JF - Journal of Laser Applications N2 - We report for the first time on the realization, characterization and application of an ultrashort pulsed laser robot system for flexible and large-area 2D and 3D laser micromachining with 6 articulated axes. To characterize the dynamic positioning of the laser beam during and after axes movement, CMOS image sensors were integrated into the beam path. A method introduced for the alignment of the optical axes allows a reduction of the deviations in laser beam positioning to less than 141.8 ± 92.9 μm within a 110° rotation range of axis 4. In addition, a high laser beam positioning repeatability of less than 102.2 μm is demonstrated over a total period of 14 h for a movement of axis 5 within a range of 0° to 90°. Initial laser cutting, laser structuring and laser marking applications on automotive dashboards and glass substrates are presented for flexible and large area 2D and 3D manufacturing. By applying a special laser cutting strategy for processing AF 32 eco thin glass, high cutting quality is achieved with a taper of up to 96.3% without the generation of cracks, demonstrating the innovative potential of the high-precision laser robot system. Nonetheless, different identified inherent influences of each axis 1–5 during robot axis movement demand for an innovative beam stabilization concept to achieve high precision in laser beam positioning. KW - Ultrakurzzeitlaser KW - Industrieroboter Y1 - 2023 N1 - Proceedings of the International Congress of Applications of Lasers & Electro-Optics (ICALEO 2023) VL - 35 IS - 4 SP - 042057 EP - 042065 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Friedrich, Peter A1 - Burwitz, Vadim A1 - Jelinek, Martin A1 - Hudec, Rene T1 - Testing of lobster-eye type telescopes with X-rays and visible light T2 - SPIE Proceedings N2 - Reflective coatings for astronomical X-ray optics were developed at the “Aschaffenburg Competence Center for Astronomical and Space Instrumentation” (ACCASI) since several years. As part of a Bavarian-Czech cooperation between the Technical University of Aschaffenburg and the Czech Technical University of Prague, now two mechanically identical telescopes were built. One telescope optic was equipped with conventional gold-coated mirrors, manufactured by the Czech project partners. The 34 X-ray mirrors of the second telescope use an innovative coating system made of chromium and iridium, which was applied at the Aschaffenburg coating laboratory. Both telescopes are designed according to the bionic principle of a reflecting lobster eye. The optics works with two consecutive reflections on mutually perpendicular mirror surfaces. This enables a large field of view with many square degrees in diameter, which, however, comes at the price of a reduced angular resolution. An extensive X-ray characterization of these telescopes was carried out at the PANTER test facility of MPE, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. Furthermore, the used X-ray mirrors reflect and focus visible light as well and this functionality in the optical regime was checked in laboratory tests. Now another test campaign was done to examine the telescope resolution for real objects of the visible sky and the imaging properties for star constellations. Such functional tests by observing astronomical objects of the visible sky may simplify and accelerate the development of X-ray telescopes for satellite applications. KW - X-rays KW - Telescopes KW - X-ray telescopes KW - Reflection KW - Mirrors KW - Röntgenteleskop Y1 - 2023 U6 - https://doi.org/https://doi.org/10.1117/12.2665429 VL - 2023 IS - 12576 SP - 1257606-1 EP - 1257606-5 PB - SPIE ER - TY - JOUR A1 - Raiyn, Jamal A1 - Weidl, Galia T1 - Predicting Autonomous Driving Behavior through Human Factor Considerations in Safety-Critical Events JF - Smart Cities N2 - This paper investigates the ability of autonomous driving systems to predict outcomes by considering human factors like gender, age, and driving experience, particularly in the context of safety-critical events. The primary objective is to equip autonomous vehicles with the capacity to make plausible deductions, handle conflicting data, and adjust their responses in real-time during safety-critical situations. A foundational dataset, which encompasses various driving scenarios such as lane changes, merging, and navigating complex intersections, is employed to enable vehicles to exhibit appropriate behavior and make sound decisions in critical safety events. The deep learning model incorporates personalized cognitive agents for each driver, considering their distinct preferences, characteristics, and requirements. This personalized approach aims to enhance the safety and efficiency of autonomous driving, contributing to the ongoing development of intelligent transportation systems. The efforts made contribute to advancements in safety, efficiency, and overall performance within autonomous driving systems. To describe the causal relationship between external factors like weather conditions and human factors, and safety-critical driver behaviors, various data mining techniques can be applied. One commonly used method is regression analysis. Additionally, correlation analysis is employed to reveal relationships between different factors, helping to identify the strength and direction of their impact on safety-critical driver behavior. Keywords: car following; decision making; driving behavior; naturalistic driving studies; safety-critical events; cognitive vehicles 1. Introduction Despite the increasing prevalence of vehicle automation, the persistently high number of car crashes remains a concern. Safety-critical events in human-driven scenarios have become more intricate and partially uncontrollable due to unforeseen circumstances. Investigating human driving behavior is imperative to establish traffic baselines for mixed traffic, encompassing traditional, automated, and autonomous vehicles (AVs). Various factors, such as weather conditions affecting visibility in longitudinal car-following (CF) behavior [1,2], influence human driving behavior [3]. Car-following behavior, illustrating how a following vehicle responds to the lead vehicle in the same lane, is a crucial aspect. Existing car-following models often make assumptions about homogeneous drivers, neglecting significant heterogeneity in driving experience, gender, character, emotions, and sociological, psychological, and physiological traits. Failing to account for this heterogeneity hampers a comprehensive understanding of car-following behavior, limiting model accuracy and applicability. In the development of more realistic car-following models for mixed traffic, acknowledging the diversity among drivers is crucial. By including individual variations such as risk-taking tendencies, reaction times, decision-making processes, and driving styles, the modeling of real-world driving complexities can be improved. Simplifying drivers into a few categories overlooks the richness and variety of their characteristics, prompting the need for a more comprehensive approach to capture nuances within different driver profiles. To address these Smart Cities KW - Autonomes Fahrzeug KW - Mensch-Maschine-Kommunikation Y1 - 2024 UR - https://www.mdpi.com/2624-6511/7/1/18 U6 - https://doi.org/https://doi.org/10.3390/ smartcities7010018 VL - 7 IS - 1 SP - 460 EP - 474 ER - TY - CHAP A1 - Kefer, Stefan A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Sapphire-Based Planar Bragg Grating Devices T2 - 28th International Conference on Optical Fiber Sensors N2 - This study reports on the long-term stability and the high-temperature capability of sapphire-based photonic crystal waveguides with integrated Bragg gratings. Furthermore, their Bragg grating reflectivity as well as their temperature sensitivity is quantified. KW - Bragg-Reflektor KW - Wellenleiter Y1 - 2023 SN - 978-1-957171-30-2 U6 - https://doi.org/10.1364/OFS.2023.W2.4 ER - TY - CHAP A1 - Kefer, Stefan A1 - Pape, Natalie A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Fabrication of Lattice-Like Waveguides in Planar Cyclic Olefin Copolymers T2 - 28th International Conference on Optical Fiber Sensors N2 - This work demonstrates the femtosecond laser-based fabrication of lattice-like waveguides in planar cyclic olefin copolymers. An overview of the fabrication process is provided and waveguiding in the C-band is proven via optical near-field analysis. KW - Wellenleiter KW - Femtosekundenlaser Y1 - 2023 SN - 978-1-957171-30-2 U6 - https://doi.org/10.1364/OFS.2023.Th6.69 ER - TY - JOUR A1 - Kefer, Stefan A1 - Limbach, Tobias A1 - Pape, Natalie A1 - Klamt, Kathrin A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Birefringence in Injection-Molded Cyclic Olefin Copolymer Substrates and Its Impact on Integrated Photonic Structures JF - Polymers N2 - This contribution quantifies the birefringence within injection-molded cyclic olefin copolymer plates and discusses its impact on the mechanical properties of the plates. It also focuses on the impact of birefringence on integrated waveguides and Bragg gratings and provides fabrication guidelines for such structures. The anisotropy in all three dimensions of the workpiece is examined by means of polarimetry and a prism coupler. It is found that the birefringence is inhomogenously distributed within the workpieces, whereas the maximum birefringence not only varies locally, but also depends on the observation direction. Overall, a maximum birefringence of 10 × 10−4 is found at the plate’s surface near the injection gate. The anisotropy then reduces exponentially towards the center of the workpiece and saturates at 1.8 × 10−4, in a depth of 0.4 mm. Thus, the birefringence strongly affects near-surface photonic structures. It is found that, depending on their orientation and the local birefringence of the substrate, waveguides and Bragg gratings fabricated with comparable parameters behave completely differently in terms of polarization-dependent optical attenuation, cross-sectional intensity distribution and Bragg reflection signal. For example, the support of the TM mode can vary between total loss and an optical attenuation of 0.9 dB × cm−1. In consequence, this study underlines the importance of quantifying the birefringent state of an injection-molded cyclic olefin copolymer workpiece if it is supposed to serve as a substrate for integrated photonic structures. The study furthermore demonstrates that birefringence effects can be omitted by burying the photonic structures deeper into the volume of the thermoplastic. KW - cyclic olefin copolymer KW - birefringence KW - integrated photonics KW - Bragg grating KW - injection molding KW - Bragg-Reflektor KW - Wellenleiter KW - Doppelbrechung Y1 - 2024 UR - https://www.mdpi.com/2073-4360/16/2/168 U6 - https://doi.org/10.3390/polym16020168 VL - 16 IS - 2 SP - 168 EP - 168 ER - TY - CHAP A1 - Normann, Marc A1 - Haug, Jim A1 - Valencia, Yeimy A1 - Abke, Jörg A1 - Hagel, Georg ED - Mottock, Jürgen ED - Hagel, Georg T1 - Adaptive Learning Path Sequencing Based on Learning Styles within N-dimensional Spaces T2 - ECSEE '23: Proceedings of the 5th European Conference on Software Engineering Education N2 - Planning adaptive learning paths for students’ progress throughout a course can be a challenging task, although it can be helpful for their learning progress. Within the HASKI-System, students should be able to get their own, personalized learning paths. In this paper, we present an approach towards the learning path sequencing problem. This idea is based on a novel proposal for arranging learning objects in a multi-dimensional space, bringing the relationship and similarities of these objects into a new relationship. We show, that we can use both, the Ant Colony Optimization Algorithm and the Genetic Algorithm with the idea of the Traveling-Salesman-Problem and get results, that are comparable with a proposed literature-based adaption mechanism. Nevertheless, the learning paths are all personalized based on the Felder & Silverman Learning Style Model and the hyperspace model will allow us later on to include more dimensions for other influencing factors. KW - Learning Path Sequencing KW - Adaptive Learning Path KW - Ant Colony KW - Genetic Algorithm KW - Adaptive Learning Environment KW - Lernstil KW - Lernerfolg Y1 - 2023 UR - https://dl.acm.org/doi/abs/10.1145/3593663.3593676 U6 - https://doi.org/https://doi.org/10.1145/3593663.3593676 VL - 2023 SP - 56 EP - 64 ER - TY - JOUR A1 - Trent, Davis A1 - Thielemann, Christiane A1 - Monici, Monica T1 - How are cell and tissue structure and function influenced by gravity and what are the gravity perception mechanisms? JF - npj Microgravity N2 - Progress in mechanobiology allowed us to better understand the important role of mechanical forces in the regulation of biological processes. Space research in the field of life sciences clearly showed that gravity plays a crucial role in biological processes. The space environment offers the unique opportunity to carry out experiments without gravity, helping us not only to understand the effects of gravitational alterations on biological systems but also the mechanisms underlying mechanoperception and cell/tissue response to mechanical and gravitational stresses. Despite the progress made so far, for future space exploration programs it is necessary to increase our knowledge on the mechanotransduction processes as well as on the molecular mechanisms underlying microgravity-induced cell and tissue alterations. This white paper reports the suggestions and recommendations of the SciSpacE Science Community for the elaboration of the section of the European Space Agency roadmap “Biology in Space and Analogue Environments” focusing on “How are cells and tissues influenced by gravity and what are the gravity perception mechanisms?” The knowledge gaps that prevent the Science Community from fully answering this question and the activities proposed to fill them are discussed. KW - Zellkultur KW - Schwere KW - Raumfahrtbiologie Y1 - 0024 UR - https://rdcu.be/dyCjL U6 - https://doi.org/10.1038/s41526-024-00357-9 VL - 2014 IS - 10 / 16 SP - 1 EP - 7 ER - TY - CHAP A1 - Voigt, Jorrit A1 - Moeckel, Michael T1 - Modelling dynamic 3D heat transfer in laser material processing based on physics informed neural networks N2 - Machine learning algorithms make predictions by fitting highly parameterized nonlinear functions to massive amounts of data. Yet those models are not necessarily consistent with physical laws and offer limited interpretability. Extending machine learning models by introducing scientific knowledge in the optimization problem is known as physics-based and data-driven modelling. A promising development are physics informed neural networks (PINN) which ensure consistency to both physical laws and measured data. The aim of this research is to model the time-dependent temperature profile in bulk materials following the passage of a moving laser focus by a PINN. The results from the PINN agree essentially with finite element simulations, proving the suitability of the approach. New perspectives for applications in laser material processing arise when PINNs are integrated in monitoring systems or used for model predictive control. KW - Neuronales Netz KW - Laserbearbeitung Y1 - 2022 UR - https://www.researchgate.net/publication/364325407_Modelling_dynamic_3D_heat_transfer_in_laser_material_processing_based_on_physics_informed_neural_networks U6 - https://doi.org/10.1051/epjconf/202226602010 ER - TY - CHAP A1 - Akcatepe, Osman A1 - Moeckel, Michael T1 - Hybrid Physics-Inspired Machine Learning Framework for Predictive Maintenance of Forklift Chains: Leveraging Sensor Data Characteristics N2 - Bridging the gap between physics-based modeling and data-driven machine learning promises to reduce the amount of training data required and to improve explainability in predictive maintenance applications. For a small fleet of industrial forklift trucks, we develop a physically inspired framework for predicting remaining useful life (RUL) for selected components by integrating physically motivated feature extraction, degradation modelling and machine learning. The discussed approach is promising for situations of limited data availability or large data heterogeneity, which often occurs in fleets of customized vehicles optimized for particular tasks. KW - Maschinelles Lernen KW - Gabelstapler Y1 - 2023 UR - https://ieeexplore.ieee.org/abstract/document/10375057/authors#authors U6 - https://doi.org/10.1109/ICCMA59762.2023.10375057 ER - TY - JOUR A1 - Voigt, Jorrit A1 - Moeckel, Michael T1 - Benchmarking a multi-layer approach and neural network architectures for defect detection in PBF-LB/M JF - Materials Today Communications N2 - The substitution of expensive non-destructive material testing by data-based process monitoring is intensively explored in quality assurance for additive manufactured components. Machine learning show promising results for defect detection but require conceptual adaption to layer wise manufacturing and line scanning patterns in laser powder bed fusion. A multi-layer approach to co-register µ-computer tomography measurements with process monitoring data is developed and a workflow for automatic data set generation is implemented. The objective of this research is to benchmark the volumetric multi-layer approach and specifically selected deep learning methods for defect detection. The volumetric approach shows superior results compared to single slice monitoring. All investigated structured neural network topologies deliver similar performance. KW - Neuronales Netz KW - Maschinelles Lernen KW - Fehlererkennung Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S2352492822017196?via%3Dihub U6 - https://doi.org/https://doi.org/10.1016/j.mtcomm.2022.104878 VL - 2022 IS - 33/104878 SP - * EP - * ER - TY - JOUR A1 - Voigt, Jorrit A1 - Bock, Thomas A1 - Hilpert, Uwe A1 - Hellmann, Ralf A1 - Moeckel, Michael T1 - Increased relative density and characteristic melt pool Signals at the edge in PBF-LB/M JF - Additive Manufacturing N2 - Limited process control can cause metallurgical defect formation and inhomogeneous relative density in laser powder bed fusion manufactured parts. This study shows that process monitoring, based on optical melt-pool signal analysis is capable of tracing relative density variations: Unsupervised machine learning, applied to cluster multiple-slice monitoring data, reveals characteristic patterns in this noisy time-series signal, which can be co-registered with geometrical positions in the build part. For cylindrical 15–5 PH stainless steel specimens, manufactured under constant process parameters and post-analyzed by µ-computer tomography, correlations between such patterns and an increased local relative density at the edge have been observed. Finite element method (FEM) modeling of thermal histories at exemplary positions close to the edge suggest pre-heating effects caused by neighboring laser scan trajectories as possible reasons for the increased melt pool intensity at the edge. KW - Maschinelles Lernen KW - Schmelze Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S2214860422001993?via%3Dihub U6 - https://doi.org/https://doi.org/10.1016/j.addma.2022.102798 VL - 2022 IS - 57/102798 SP - * EP - * ER - TY - JOUR A1 - Pineda, Aruane M. A1 - Alves, Caroline L. A1 - Möckel, Michael A1 - de O Toutain, Thaise G. L. A1 - Moura Porto, Joel Augusto A1 - Rodrigues, Francisco A. T1 - Analysis of quantile graphs in EGC data from elderly and young individuals using machine learning and deep learning JF - Journal of Complex Networks N2 - Heart disease, also known as cardiovascular disease, encompasses a variety of heart conditions that can result in sudden death for many people. Examples include high blood pressure, ischaemia, irregular heartbeats and pericardial effusion. Electrocardiogram (ECG) signal analysis is frequently used to diagnose heart diseases, providing crucial information on how the heart functions. To analyse ECG signals, quantile graphs (QGs) is a method that maps a time series into a network based on the time-series fluctuation proprieties. Here, we demonstrate that the QG methodology can differentiate younger and older patients. Furthermore, we construct networks from the QG method and use machine-learning algorithms to perform the automatic diagnosis, obtaining high accuracy. Indeed, we verify that this method can automatically detect changes in the ECG of elderly and young subjects, with the highest classification performance for the adjacency matrix with a mean area under the receiver operating characteristic curve close to one. The findings reported here confirm the QG method’s utility in deciphering intricate, nonlinear signals like those produced by patient ECGs. Furthermore, we find a more significant, more connected and lower distribution of information networks associated with the networks from ECG data of the elderly compared with younger subjects. Finally, this methodology can be applied to other ECG data related to other diseases, such as ischaemia. KW - Maschinelles Lernen KW - Elektrokardiogramm KW - Älterer Mensch KW - Heranwachsender Y1 - 2023 UR - https://academic.oup.com/comnet/article-abstract/11/5/cnad030/7260365?redirectedFrom=fulltext U6 - https://doi.org/https://doi.org/10.1093/comnet/cnad030 VL - 2023 IS - 11/5 SP - * EP - * ER - TY - JOUR A1 - Stier, Simon P. A1 - Xu, Xukuan A1 - Gold, Lukas A1 - Möckel, Michael T1 - Ontology-Based Battery Production Dataspace and Its Interweaving with Artificial Intelligence-Empowered Data Analytics JF - Energy Technology N2 - Heart disease, also known as cardiovascular disease, encompasses a variety of heart conditions that can result in sudden death for many people. Examples include high blood pressure, ischaemia, irregular heartbeats and pericardial effusion. Electrocardiogram (ECG) signal analysis is frequently used to diagnose heart diseases, providing crucial information on how the heart functions. To analyse ECG signals, quantile graphs (QGs) is a method that maps a time series into a network based on the time-series fluctuation proprieties. Here, we demonstrate that the QG methodology can differentiate younger and older patients. Furthermore, we construct networks from the QG method and use machine-learning algorithms to perform the automatic diagnosis, obtaining high accuracy. Indeed, we verify that this method can automatically detect changes in the ECG of elderly and young subjects, with the highest classification performance for the adjacency matrix with a mean area under the receiver operating characteristic curve close to one. The findings reported here confirm the QG method’s utility in deciphering intricate, nonlinear signals like those produced by patient ECGs. Furthermore, we find a more significant, more connected and lower distribution of information networks associated with the networks from ECG data of the elderly compared with younger subjects. Finally, this methodology can be applied to other ECG data related to other diseases, such as ischaemia. KW - Batterie KW - Künstliche Intelligenz Y1 - 2024 UR - https://onlinelibrary.wiley.com/doi/epdf/10.1002/ente.202301305 U6 - https://doi.org/https://doi.org/10.1002/ente.202301305 VL - 2024 IS - 2301305 SP - 1 EP - 13 ER - TY - JOUR A1 - Zanotto, Franco M. A1 - Zapata Dominguez, Diana A1 - Ayerbe, Elixabete A1 - Boyano, Iker A1 - Burmeister, Christine A1 - Duquesnoy, Marc A1 - Eisentraeger, Marlene A1 - Florez Montaño, Jonathan A1 - Gallo-Bueno,, Alfonso A1 - Gold, Lucas A1 - Hall, Florian A1 - Kaden, Nicolaj A1 - Muerkens, Bernhard A1 - Otaegui, Laida A1 - Reynier, Yvan A1 - Stier, Simon A1 - Thomitzek, Matthias A1 - Turetskyy, Artem A1 - Vallin, Nicolas A1 - Wessel, Jacob A1 - Xu, Xukuan A1 - Abbasov, Jeyhun A1 - Franco, Alejandro A. T1 - Data Specifications for Battery Manufacturing Digitalization: Current Status, Challenges, and Opportunities JF - Chemistry Europe - Batteries & Supercaps N2 - Lithium-ion battery (LIB) manufacturing requires a pilot stage that optimizes its characteristics. However, this process is costly and time-consuming. One way to overcome this is to use a set of computational models that act as a digital twin of the pilot line, exchanging information in real-time that can be compared with measurements to correct parameters. Here we discuss the parameters involved in each step of LIB manufacturing, show available computational modeling approaches, and discuss details about practical implementation in terms of software. Then, we analyze these parameters regarding their criticality for modeling set-up and validation, measurement accuracy, and rapidity. Presenting this in an understandable format allows identifying missing aspects, remaining challenges, and opportunities for the emergence of pilot lines integrating digital twins. Finally, we present the challenges of managing the data produced by these models. As a snapshot of the state-of-the-art, this work is an initial step towards digitalizing battery manufacturing pilot lines, paving the way toward autonomous optimization. KW - Batterie KW - Digitalisierung Y1 - 2022 UR - https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/batt.202200224 U6 - https://doi.org/https://doi.org/10.1002/batt.202200224 VL - 2022 IS - 5/9 SP - 1 EP - 35 ER - TY - JOUR A1 - Alves, Caroline A1 - Ciba, Manuel A1 - de O Toutain, Thaise GL A1 - Moura Porto, Joel Augusto A1 - de Sena, Eduardo Pondé A1 - Thielemann, Christiane A1 - Rodrigues, Francisco A T1 - On the advances in machine learning and complex network measures to an EEG dataset from DMT experiments JF - Journal of Physics: Complexity N2 - There is a growing interest in the medical use of psychedelic substances, as preliminary studies using them for psychiatric disorders have shown positive results. In particular, one of these substances is N, N-dimethyltryptamine (DMT), an agonist serotonergic psychedelic that can induce profound alterations in the state of consciousness. In this work, we use an exploratory tool to reveal DMT-induced changes in brain activity using EEG data and provide new insights into the mechanisms of action of this psychedelic substance. We used a two-class classification based on (A) the connectivity matrix or (B) complex network measures derived from it as input to a support vector machine. We found that both approaches could detect changes in the brain's automatic activity, with case (B) showing the highest AUC (89%), indicating that complex network measurements best capture the brain changes that occur due to DMT use. In the second step, we ranked the features that contributed the most to this result. For case (A), we found that differences in the high alpha, low beta, and delta frequency bands were most important in distinguishing between the state before and after DMT inhalation, which is consistent with the results described in the literature. Further, the connection between the temporal (TP8) and central cortex (C3) and between the precentral gyrus (FC5) and the lateral occipital cortex (P8) contributed most to the classification result. The connection between regions TP8 and C3 has been found in the literature associated with finger movements that might have occurred during DMT consumption. However, the connection between cortical areas FC5 and P8 has not been found in the literature and is presumably related to the volunteers' emotional, visual, sensory, perceptual, and mystical experiences during DMT consumption. For case (B), closeness centrality was the most crucial complex network measure. Furthermore, we discovered larger communities and longer average path lengths when DMT was used and the converse when not, showing that the balance between functional segregation and integration had been disrupted. These findings support the idea that cortical brain activity becomes more entropic under psychedelics. Overall, a robust computational workflow has been developed here with interpretability of how DMT (or other psychedelics) modify brain networks and insights into their mechanism of action. Finally, the same methodology applied here may help interpret EEG time series from patients who consumed other psychedelic drugs. KW - Neuronales Netz KW - Halluzinogen Y1 - 2024 U6 - https://doi.org/10.1088/2632-072X/ad1c68 VL - 2024 IS - 1 SP - 1 EP - 2 ER - TY - RPRT A1 - Jost, Thomas T1 - Zentralbankverluste und "ungerechte?" Bankengewinne infolge der Wertpapieraufkaufprogramme und der Verzinsung der Überschussreserven T2 - Weidener Diskussionspapiere N2 - Das Eurosystem und auch die Deutsche Bundesbank werden 2023 Verluste erzielen, die einige Jahre anhalten dürften. Aufgrund der massiven Käufe von Wertpapieren in den letzten 10 Jahren, vor allem Staatsanleihen, sind die Überschussreserven der Banken stark angestiegen. Die dadurch bedingten hohen Zinszahlungen an die Banken seit der geldpolitischen Kehrtwende, bei geringen Einnahmen für die hohen Wertpapierbestände, führten zu massiver Kritik. Die Banken würden dadurch „ungerechte“ Gewinne erzielen, während die Fiskalbehörden auf die früher üblichen Überweisungen der Zentralbankgewinne verzichten müssen. Populistische Forderungen nach einer Begrenzung der Bankengewinne durch z.B. eine pauschale, drastische Erhöhung der Mindestreservesätze im Eurosystem zur Reduzierung der Überschussreserven bergen neue Probleme und sind nicht hilfreich. Letztlich haben die Staaten sehr lange von historisch niedrigen Zinsen infolge der expansiven Geldpolitik des Eurosystems profitiert und müssen nun die Folgen der massiven Aufblähung der Zentralbankbilanzen während des Zeitraums der Normalisierung der Geldpolitik tragen. N2 - The Eurosystem and also Deutsche Bundesbank will make losses in 2023, which are likely to last for several years. Due to massive purchases of securities over the last 10 years, especially government bonds, banks' excess reserves have risen sharply. The resulting high interest payments to the banks since the change of the monetary policy course due to high inflation, combined with low income for the high securities holdings, led to massive criticism. The banks would thereby receive “unfair” subsidies, while fiscal authorities would lose transfers of central bank profits. Populist calls for a cap on bank profits through, e.g., a drastic increase in the minimum reserve ratios in the Eurosystem to reduce excess reserves do not appear to be helpful and pose new problems. Ultimately, states have benefited from historically low interest rates for a very long time as a result of the Eurosystem’s expansionary monetary policy. Now, they have to bear the consequences of the massive increase of central bank balance sheets during the period of normalization of monetary policy KW - Europäische Zentralbank KW - Europäisches Währungssystem KW - Geldpolitik KW - eurosystem, zentralbank, überschussreserven, geldpolitik Y1 - 2023 UR - https://www.oth-aw.de/hochschule/mediathek/weitere-veroeffentlichungen/weidener-diskussionspapiere/ ER - TY - CHAP A1 - Dörringer, Antonia A1 - Klopp, Marco A1 - Schaab, Lukas A1 - Hochstetter, Marvin A1 - Glaab, Daniel A1 - Bartel, Paula A1 - Abke, Jörg A1 - Elsebach, Jens A1 - Rossmann, Raphael A1 - Hagel, Georg ED - Röpke, René ED - Schroeder, Ulrike T1 - AdLer: 3D-Lernumgebung für Studierende T2 - 21. Fachtagung Bildungstechnologien (DELFI) KW - Serious Games KW - 3D-Lernumgebung KW - Game-based Learning KW - Lernspiel KW - Dreidimensionale Computergrafik Y1 - 2023 U6 - https://doi.org/10.18420/delfi2023-41 VL - 2023 SP - 251 EP - 252 ER - TY - GEN A1 - Hochstetter, Marvin A1 - Abke, Jörg T1 - AdLer - Adaptive digitale Lernräume: Autorentool und 3D-Lernumgebung N2 - Die fortschreitende Digitalisierung im Bildungssektor ist gerade für die Berufliche Weiterbildung von zentraler Bedeutung. Bereits seit längerer Zeit sind in diesem Kontext zeit- und ortsunabhängige Lehr-Lern-Formate sehr wichtig. Allerdings bietet digitales Lernen auch großes Potential hinsichtlich dem Thema Motivationsförderung. Serious Games stellen ein vielversprechendes Beispiel von Game-based Learning (GBL) dar, um die Lernmotivation zu adressieren. Hierbei geht es darum, Mechaniken (digitaler) Spiele zu verwenden, um einen Wissenserwerb zu ermöglichen, der zeitgleich motivierend gestaltet ist. Das AdLer-Projekt hat zum Ziel ein frei verfügbares Instrument zu entwickeln, mit welchem Lehrende virtuelle 3D-Lernumgebungen erstellen und in ihrer Lehre in unterschiedlichen Formen einsetzen können. Mit Hilfe eines Autorentools werden Lehrende bei der Konzeption und Erstellung von 3D-Lernumgebungen unterstützt. Dadurch können Lehrende auf schnellem und einfachem Weg eigene digitale 3D-Lernumgebungen erstellen sowie nach ihren individuellen Vorstellungen hinsichtlich der eigenen Lernszenarien konfigurieren. In der 3D-Lernumgebung können Lernende nach den Prinzipien des GBL erkundungsorientiert und interaktiv lernen. Dazu können Lernende mit einem virtuellen Avatar die AdLer-3D-Lernumgebung betreten und verschiedene Handlungsmöglichkeiten wahrnehmen. Sie können sich frei in dieser Lernumgebung bewegen und unterschiedliche Lernangebote (z.B. die Bearbeitung von Lernelementen, wie H5P, Text und Video) durchführen. Im geplanten Poster-Pitch wird eine aktuelle Version der Software AdLer präsentiert und steht für die Konferenzteilnehmer zum Ausprobieren bereit. N2 - Poster KW - 3D-Lernumgebung Autorentool Game-Based-Learning KW - Lernspiel KW - Dreidimensionale Computergrafik Y1 - 2023 ER - TY - CHAP A1 - Klopp, Marco A1 - Dörringer, Antonia A1 - Eigler, Tobias A1 - Bartel, Paula A1 - Hochstetter, Marvin A1 - Weishaupt, Andreas A1 - Geirhos, Philipp A1 - Abke, Jörg A1 - Hagel, Georg A1 - Elsebach, Jens A1 - Rossmann, Raphael ED - Mottok, Jürgen T1 - Development of an Authoring Tool for the Creation of Individual 3D Game-Based Learning Environments T2 - ECSEE '23: Proceedings of the 5th European Conference on Software Engineering Education N2 - Game-based learning in general and serious games in particular have a promising potential in higher education. In this article we going to show the capability of serious games with regard to current challenges in higher education. The focus of this article is the presentation of the AdLer authoring tool, which offers lecturers the possibility to design and generate virtual 3D learning environments in which students can interact with learning content according to the principles of game-based learning. KW - 3D Learning Environment KW - Authoring Tool KW - Game-based Learning KW - Serious Games KW - Lernspiel KW - Dreidimensionale Computergrafik Y1 - 2023 UR - https://dl.acm.org/doi/proceedings/10.1145/3593663 SN - 978-1-4503-9956-2 VL - 2023 IS - 5. SP - 204 EP - 209 PB - Association for Computing Machinery (ACM) CY - New York, NY, United States ER - TY - JOUR A1 - Monici, Monica A1 - Thielemann, Christiane T1 - How do gravity alterations affect animal and human systems at a cellular/tissue level? JF - nature npj Microgravity N2 - The present white paper concerns the indications and recommendations of the SciSpacE Science Community to make progress in filling the gaps of knowledge that prevent us from answering the question: “How Do Gravity Alterations Affect Animal and Human Systems at a Cellular/Tissue Level?” This is one of the five major scientific issues of the ESA roadmap “Biology in Space and Analogue Environments”. Despite the many studies conducted so far on spaceflight adaptation mechanisms and related pathophysiological alterations observed in astronauts, we are not yet able to elaborate a synthetic integrated model of the many changes occurring at different system and functional levels. Consequently, it is difficult to develop credible models for predicting long-term consequences of human adaptation to the space environment, as well as to implement medical support plans for long-term missions and a strategy for preventing the possible health risks due to prolonged exposure to spaceflight beyond the low Earth orbit (LEO). The research activities suggested by the scientific community have the aim to overcome these problems by striving to connect biological and physiological aspects in a more holistic view of space adaptation effects. KW - Raumfahrt KW - Schwere KW - Raumfahrtbiologie Y1 - 2023 U6 - https://doi.org/https://doi.org/10.1038/s41526-023-00330-y N1 - Artikel hat 62 Autoren VL - 2023 IS - 9/84 SP - 1 EP - 9 ER - TY - JOUR A1 - Polyakov, Maxim V. A1 - Weidl, Galia T1 - Chiral expansion in the dual (string) model of the Goldstone meson scattering JF - High Energy Physics - Phenomenology N2 - We consider in details the dual models for the Goldstone mesons (pions) scattering in the presence of the explicit chiral symmetry breaking caused by non-zero current quark mass. New method of incorporation of the quark masses into the dual model is suggested. In contrast to the previously considered in the literature methods, the dual amplitude obtained by this method is consistent with all low-energy theorems following from the Effective Chiral Lagrangian (EChL) to the O(p^4) order and simultaneously it does not contain states with negative width. The resonance spectrum of the model and its implications for the fourth and sixth order EChL in large N_c limit are discussed. We argue that the possible relations between large N_c QCD and some underlying string theory can be revealed by studying interactions of hadrons at low-energies. KW - Chiral expansion KW - dual string models KW - Goldstone meson scattering KW - Stringtheorie Y1 - 1996 UR - https://www.researchgate.net/publication/2034505_Chiral_expansion_in_the_dual_string_model_of_the_Goldstone_meson_scattering#fullTextFileContent U6 - https://doi.org/10.48550/arXiv.hep-ph/9612486 VL - 1997 IS - 0/0 SP - 1 EP - 13 ER - TY - JOUR A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Dahlquist, Erik T1 - Condition Monitoring, Root Cause Analysis and Decision Support on Urgency of Actions JF - Book Series FAIA (Frontiers in Artificial Intelligence and Applications), Soft Computing Systems - Design, Management and Applications N2 - We discuss the use of a hybrid system utilizing Object Oriented Bayesian networks and influence diagrams for probabilistic reasoning under uncertainties in industrial process operations. The Bayesian networks are used for condition monitoring and root cause analysis of process operation. The recommended decision sequence of corrective actions and observations is obtained following the "myopic" approach. The BN inference on most probable root cause is used in an influence diagram for taking decisions on urgency of corrective actions vs. delivery deadline. The build-in chain of causality from root cause to process faults can provide the user with explanation facility and a simulation tool of the effect of intended actions. KW - OOBN KW - Bayesian Networks KW - Prozesssteuerung KW - Prozessanalyse Y1 - 2002 UR - https://www.researchgate.net/publication/228719447_Condition_Monitoring_Root_Cause_Analysis_and_Decision_Support_on_Urgency_of_Actions#fullTextFileContent VL - 2002 IS - 87 SP - 221 EP - 230 ER - TY - CHAP A1 - Weidl, Galia A1 - Vollmar, Gerhard A1 - Dahlquist, Erik T1 - Adaptive Root Cause Analysis under uncertainties in industrial process operation T2 - The Foundations of Computer Aided Process Operations (FOCAPO 2003) N2 - We discuss a Root Cause Analysis (RCA) system implementing a probabilistic approach based on Bayesian inference for adaptive reasoning under uncertainties in industrial process operation. The proposed approach is model based and accumulates the process knowledge within the problem domain, which data is gathered and stored in XML-based information server. The Bayesian networks have been created automatically from the XML-structured data. The interconnection between XML-failure trees is handled as object oriented instances of Bayesian sub-networks within master-network covering the entire process and monitoring its overall condition, output quality and equipment effectiveness. We implement sequential on-line adaptivity of models' parameters to reflect changes in process operation. The system learning can be supervised by user feedback on the actual root cause. The general RCA methodology is applied to plate cutting in a hot rolling mill. KW - uncertainties KW - Adaptive Root Cause Analysis KW - Root Cause KW - Adaptive KW - Prozesssteuerung KW - Prozessmodell Y1 - 2003 UR - https://www.researchgate.net/publication/262562640_Adaptive_Root_Cause_Analysis_under_uncertainties_in_industrial_process_operation#fullTextFileContent ER - TY - CHAP A1 - Weidl, Galia A1 - Dahlquist, Erik T1 - ROOT CAUSE ANALYSIS FOR PULP AND PAPER APPLICATIONS T2 - Proceedings of the 10th Control Systems Conference, Stockholm, Sweden, June 3-5, 2002 N2 - We propose a methodology for Root Cause Analysis (RCA), allowing fast and flexible decision support for operators, maintenance staff and process engineers in pulp and paper industry. RCA can identify non-obvious process problems and is therefore a powerful complement to normal automatic control. The general methodology is applied to a continuous digester. KW - RCA KW - Root Cause Analysis KW - Prozessanalyse KW - Papierindustrie Y1 - 2002 UR - https://www.researchgate.net/publication/262562479_ROOT_CAUSE_ANALYSIS_FOR_PULP_AND_PAPER_APPLICATIONS#fullTextFileContent SP - 343 EP - 347 ER - TY - JOUR A1 - Dahlquist, Erik A1 - Lindberg, Thomas A1 - Karlsson, Christer Per A1 - Weidl, Galia A1 - Bigaran, Carlo A1 - Davey, Austin T1 - Integrated Process Control, Fault Diagnostics, Process Optimization and Production Planning - Industrial IT JF - IFAC Proceedings Volumes N2 - In the presentation a total system is presented, making use of data reconciliation, different types of diagnostics with respect to sensors, control loops and processes. These are used as inputs to a root cause analysis system, optimization and advanced control, using among others MPC, model predictive control. The system is being implemented at Visy Pulp and Paper mill in Tumut, Australia. KW - MPC KW - Model Predictive Control KW - root cause analysis KW - RCA KW - Prozesssteuerung KW - Papierindustrie Y1 - 2001 UR - https://www.sciencedirect.com/science/article/pii/S147466701733567X?via%3Dihub U6 - https://doi.org/10.1016/S1474-6670(17)33567-X VL - 2001 IS - 34/27 SP - 47 EP - 55 ER - TY - JOUR A1 - Alexandrovich Kudryavtsev, Viacheslav A1 - Weidl, Galia T1 - A possible description of the quantum numbers in a hadronic string model JF - High Energy Physics - Theory N2 - We consider a critical composite superconformal string model to desribe hadronic interactions. We present a new approach of introducing hadronic quantum numbers in the scattering amplitudes. The physical states carry the quantum numbers and form a common system of eigenfunctions of the operators in this string model. We give explicit constructions of the quantum number operators. KW - quantum numbers KW - quantum KW - hadronic string model KW - Stringtheorie Y1 - 1996 UR - https://www.researchgate.net/publication/2077915_A_possible_description_of_the_quantum_numbers_in_a_hadronic_string_model#fullTextFileContent VL - 1996 IS - 0/0 SP - 1 EP - 14 ER - TY - JOUR A1 - Sapsai, Iryna A1 - Valencia, Yeimy A1 - Abke, Jörg T1 - Learning Analytics Dashboard for Educators: Proposed Project to Design with Pedagogical Background JF - ECSEE '23: Proceedings of the 5th European Conference on Software Engineering Education N2 - In this article, the authors describe a prototype of a Learning Analytics Dashboard (LAD) for educators. It is based on the analysis of pedagogical actions and taking into the process and learning style of students in an online environment based on learning analytics (LA). A description of the Dashboard structure, divided into levels and categories based on available learning analytics, will allow the educator to dive deeper into the online course themselves and explore more. It will also allow them to determine the level of student performance, identify gaps in learning materials, and research student data. The authors have identified further directions for the development of a LAD for a professor, including modeling algorithms for researching student behavior and learning style using Artificial Intelligence and presenting LA in a visualized form. This paper shows the stages of creating a professor's LAD prototype as a functional part of the adaptive learning system in the HASKI-System to analyze visual information obtained from LA and the possibilities to monitor the learning process, learning progress, student activity, and make decisions on careful intervention in the students’ learning process. KW - Lerntechnik KW - Computerunterstütztes Lernen Y1 - 2023 UR - https://dl.acm.org/doi/abs/10.1145/3593663.3593686 U6 - https://doi.org/https://doi.org/10.1145/3593663.3593686 VL - 2023 IS - ECSEE '23: Proceedings of the 5th European Conference on Software Engineering Education SP - 38 EP - 47 ER - TY - JOUR A1 - Rötzel, Peter A1 - Jöris, Sabine T1 - Trends im Nachhaltigkeitscontrolling - Empirische Ergebnisse aus der Green Controlling Studie 2022 des ICV JF - Controlling N2 - Die vorliegende Studie untersucht Entwicklungen und Trends im Nachhaltigkeitscontrolling, insbesondere hinsichtlich der strategischen Bedeutung der fünf Stufen der Nachhaltigkeit, des Einflusses von Stakeholdergruppen, Zielsetzungen und Instrumenten anhand von drei Studien des Fachkreis Green Controlling for Responsible Business und gibt Implikationen für die Controlling- und Unternehmenspraxis. KW - Nachhaltigkeitscontrolling KW - Green Controlling KW - Controllerstudie KW - Sustainability KW - Nachhaltigkeit KW - Controlling Y1 - 2023 VL - 35 IS - 6 SP - 44 EP - 51 ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Dahlquist, Erik T1 - Object Oriented Bayesian Networks for Industrial Process Operation T2 - Proceedings of the first Bayesian Application Modeling Workshop at the 19th Conference in Uncertainty in Artificial Intelligence, 2003 N2 - We present an application, where extensions of existing methods for decision-theoretic troubleshooting are used for industrial process operation and asset management. The extension includes expected average cost of asset management actions, prediction of signals' level-trend development, risk assessment for disturbance analysis and predictive maintenance on demand. KW - Bayesian Networks KW - OOBN KW - Prozesssteuerung Y1 - 2003 UR - https://www.researchgate.net/publication/2942492_Object_Oriented_Bayesian_Networks_for_Industrial_Process_Operation#fullTextFileContent ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Dahlquist, Erik T1 - Applications of object-oriented Bayesian networks for causal analysis of process disturbances T2 - SIMS'2003 (44th International Conference of the Scandinavian Simulation Society) N2 - We discuss a hybrid approach for causal analysis of disturbances in industrial process operation. It represents a combination of OOBN with first level diagnostic packages and physical models serving as agents in the system design and providing evidence for automated reasoning on abnormality in process operation. The aim is causal analysis of non-measurable disturbances as a decision advice complement to the distributed control system (DCS). The approach includes prediction of signals' level-trend development, risk assessment for disturbance analysis and predictive maintenance on demand. The methodology has been applied on a screening process with a pressure-flow network in a Pulp Mil. KW - OOBN KW - DCS KW - Bayesian Networks KW - Prozessmodell KW - Prozesssteuerung Y1 - 2003 UR - https://www.researchgate.net/publication/228679172_Applications_of_object-oriented_Bayesian_networks_for_causal_analysis_of_process_disturbances#fullTextFileContent ER - TY - CHAP A1 - Weidl, Galia T1 - ADAPTIVE RISK ASSESSMENT IN COMPLEX LARGE SCALE PROCESSES WITH REDUCED COMPUTATIONAL COMPLEXITY T2 - 9th International Conference on Industrial Engineering Theory, Applications & Practice, November 27-30, 2004 N2 - We have developed a methodology that targets risk assessment for process operation. It includes both abnormality prediction and evaluation of its development, provided no corrective actions are taken, as well as a possibility to examine the impact of intended actions. It handles the uncertainties in the domain and the big number of influences on the effect variables by utilizing causal probabilistic modeling. The process is modeled by Hidden Markov Models (HMM), and object oriented dynamic Bayesian networks (OOBNs). Various modeling techniques and assumptions have been used to reduce the computational complexity and ensure fast inference. The methodology is applied in a case study. KW - Adaptive Risk Management KW - Hidden Markov Models KW - HMM KW - OOBN KW - Bayesian Networks KW - Prozessmodell Y1 - 2004 UR - http://www.orsnz.org.nz/conf39/ProgramSummary.pdf ER - TY - JOUR A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Israelson, S. T1 - Applications of object-oriented Bayesian networks for condition monitoring, root cause analysis and decision support on operation of complex continuous processes JF - Computers & Chemical Engineering N2 - The increasing complexity of large-scale industrial processes and the struggle for cost reduction and higher profitability means automated systems for processes diagnosis in plant operation and maintenance are required. We have developed a methodology to address this issue and have designed a prototype system on which this methodology has been applied. The methodology integrates decision-theoretic troubleshooting with risk assessment for industrial process control. It is applied to a pulp digesting and screening process. The process is modeled using generic object-oriented Bayesian networks (OOBNs). The system performs reasoning under uncertainty and presents to users corrective actions, with explanations of the root causes. The system records users’ actions with associated cases and the BN models are prepared to perform sequential learning to increase its performance in diagnostics and advice. KW - Bayes Networks KW - Prozessüberwachung KW - Fehlererkennung KW - Prozesssteuerung Y1 - 2005 UR - https://www.sciencedirect.com/science/article/abs/pii/S009813540500133X?via%3Dihub U6 - https://doi.org/10.1016/j.compchemeng.2005.05.005 VL - 2005 IS - 29/9 SP - 1996 EP - 2009 ER - TY - JOUR A1 - Weidl, Galia A1 - Rode, Manfred A1 - Horch, Alexander A1 - Shaw, Christopher A1 - Vollmer, Andreas T1 - Automated root cause analysis of faults and disturbances in rolling mills JF - Stahl und Eisen N2 - The developed methodology for Root Cause Analysis (RCA) demonstrates a decision support tool evaluating the process state based on both qualitative and quantitative information. The presented RCA system uses the available data to extract the most probable root causes and proposes an action sequence. The learning ability of the system allows its sequential on-line adaptation to reflect changes in process operation. N2 - Die entwickelte Methodik für die Fehlerursachenanalyse (RCA) stellt ein Instrument zur Entscheidungsunterstützung dar, das den Prozesszustand auf der Grundlage qualitativer und quantitativer Informationen bewertet. Das vorgestellte RCA-System nutzt die verfügbaren Daten, um die wahrscheinlichsten Grundursachen zu ermitteln und schlägt eine Handlungssequenz vor. Die Lernfähigkeit des Systems ermöglicht seine sequentielle Online-Anpassung, um Änderungen im Prozessbetrieb zu berücksichtigen. KW - rolling mills KW - Walzwerke KW - Walzwerk KW - Prozessanalyse Y1 - 2005 UR - https://www.researchgate.net/publication/296803110_Automated_root_cause_analysis_of_faults_and_disturbances_in_rolling_mills VL - 2005 IS - 125/8 SP - 29 EP - 34 ER - TY - CHAP A1 - Röhrl, Norbert A1 - Iglesias-Rozas, José R. A1 - Weidl, Galia T1 - Computer Assisted Classification of Brain Tumors T2 - Data Analysis, Machine Learning and Applications N2 - The histological grade of a brain tumor is an important indicator for choosing the treatment after resection. To facilitate objectivity and reproducibility, Iglesias et al. (1986) proposed to use a standardized protocol of 50 histological features in the grading process. We tested the ability of Support Vector Machines (SVM), Learning Vector Quantization (LVQ) and Supervised Relevance Neural Gas (SRNG) to predict the correct grades of the 794 astrocytomas in our database. Furthermore, we discuss the stability of the procedure with respect to errors and propose a different parametrization of the metric in the SRNG algorithm to avoid the introduction of unnecessary boundaries in the parameter space. KW - brain KW - brain tumor KW - tumor KW - Hirntumor Y1 - 2007 UR - https://link.springer.com/chapter/10.1007/978-3-540-78246-9_7 U6 - https://doi.org/10.1007/978-3-540-78246-9_7 SP - 55 EP - 60 PB - Springer ER - TY - JOUR A1 - Weidl, Galia A1 - Röhrl, Norbert A1 - Rozas, Javier T1 - Causal probabilistic modeling for malignancy grading in pathology with explanations of dependency to the related histological features JF - Histology and Histopathology N2 - This work demonstrates that histological grading of brain tumors and astrocytomas can be accurately predicted and causally explained with the help of causal probabilistic models, also known as Bayesian networks (BN). Although created statistically, this allows individual identification of the grade of malignancy as an internal cause that has enabled the development of the histological features to their observed state. The BN models are built from data representing 794 cases of astrocytomas with their malignant grading and corresponding histological features. The computerized learning process is improved when pre-specified knowledge (from the pathologist) about simple dependency relations to the histological features is taken into account. We use the BN models for both grading and causal analysis. In addition, the BN models provide a causal explanation of dependency between the histological features and the grading. This can offer the biggest potential for choice of an efficient treatment, since it concentrates on the malignancy grade as the cause of pathological observations. The causal analysis shows that all ten histological features are important for the grading. The histological features are causally ordered, implying that features of first order are of higher priority, e.g. for the choice of treatment in order not to allow the malignancy to progress to a higher degree. Due to the explanations of feature relations, the causal analysis can be considered as a powerful complement to any malignancy classification tool and allows reproducible comparison of malignancy grading. KW - malignancy KW - pathology KW - Histologie KW - Hirntumor Y1 - 2007 UR - https://pubmed.ncbi.nlm.nih.gov/17523072/ U6 - https://doi.org/10.14670/HH-22.947 VL - 2007 IS - 22/9 SP - 947 EP - 962 ER - TY - JOUR A1 - Röhrl, Norbert A1 - Iglesias-Rozas, José R. A1 - Weidl, Galia T1 - A modern reproducible method for the histologic grading of astrocytomas with statistical classification tools JF - Analytical and quantitative cytology and histology / the International Academy of Cytology [and] American Society of Cytology N2 - To investigate whether statistical classification tools can infer the correct World Health Organization (WHO) grade from standardized histologic features in astrocytomas and how these tools compare with GRADO-IGL, an earlier computer-assisted method. A total of 794 human brain astrocytomas were studied between January 1976 and June 2005. The presence of 50 histologic features was rated in 4 categories from 0 (not present) to 3 (abundant) by visual inspection of the sections under a microscope. All tumors were also classified with the corresponding WHO grade between I and IV. We tested the prediction performance of several statistical classification tools (learning vector quantization [LVQ], supervised relevance neural gas [SRNG], support vector machines [SVM], and generalized regression neural network [GRNN]) for this data set. The WHO grade was predicted correctly from histologic features in close to 80% of the cases by 2 modern classifiers (SRNG and SVM), and GRADO-IGL was predicted correctly in > 84% of the cases by a GRNN. A standardized report, based the 50 histologic features, can be used in conjunction with modern classification tools as an objective and reproducible method for histologic grading of astrocytomas. KW - Cytologie KW - Histologie KW - Hirntumor Y1 - 2008 UR - https://pubmed.ncbi.nlm.nih.gov/18459585/ VL - 2008 IS - 30/1 SP - 33 EP - 8 ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Dahlquist, Erik T1 - Decision Support on Complex Industrial Process Operation T2 - Bayesian Networks: A Practical Guide to Applications N2 - Introduction: A methodology for Root Cause AnalysisPulp and paper applicationThe ABB Industrial IT platformConclusion KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Künstliche Intelligenz KW - Papierindustrie Y1 - 2008 UR - https://www.wiley.com/en-gb/Bayesian+Networks%3A+A+Practical+Guide+to+Applications-p-9780470060308 U6 - https://doi.org/10.1002/9780470994559.ch18 SP - 313 EP - 328 PB - Wiley ER - TY - CHAP A1 - Kaspar, Dietmar A1 - Weidl, Galia A1 - Dang, Thao A1 - Breuel, Gabi A1 - Tamke, Andreas A1 - Rosenstiel, Wolfgang T1 - Erkennung von Fahrmanövern mit objektorientierten Bayes-Netzen T2 - 7. Workshop. Fahrerassistenzsysteme. FAS2011 N2 - In diesem Artikel wird ein Ansatz zur Erkennung von Spurwechselmanövern mit Hilfe von objekt-orientierten Bayes Netzen beschrieben. Dieser Ansatz ist eine Erweiterung von Grundlagenarbeiten zur Einscherererkennung. Zunächst werden die zur Erkennung von Spurwechselvorgängen erforderlichen Fahrsituationsmerkmale vorgestellt. Darauf aufbauend wird das entwickelte objekt-orientierte Bayes Netz zur Modellierung der Spurwechsel erläutert. Dabei wird ein Spurwechsel als eine Beziehung zwischen zwei Fahrzeugen betrachtet. Dabei kann ein Fahrzeug in der Spur bleiben, die Spur nach links oder nach rechts wechseln. Durch die Kombination der Möglichkeiten der beiden Fahrzeuge entstehen 9 Klassen. Aus den relativen Positionen der Fahrzeuge ergeben sich aus den 9 Situationsklassen 27 mögliche Spurwechselmanöver. Dabei ist das Einschervorgang ein Sonderfall der modellierten Fahrmanöver. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2011 UR - https://www.researchgate.net/publication/249226427_Erkennung_von_Fahrmanovern_mit_objektorientierten_Bayes-Netzen#fullTextFileContent ER - TY - JOUR A1 - Kaspar, Dietmar A1 - Weidl, Galia A1 - Dang, Thao A1 - Breuel, Gabi A1 - Tamke, Andreas A1 - Rosenstiel, Wolfgang T1 - Object-Oriented Bayesian Networks for Detection of Lane Change Maneuvers JF - IEEE Intelligent Transportation Systems Magazine N2 - In this paper we introduce a novel approach towards the recognition of typical driving maneuvers in structured highway scenarios and identify some of the key benefits of traffic scene modeling with object-oriented Bayesian networks (OOBNs). The approach exploits the advantages of an introduced lane-related coordinate system together with individual occupancy grids for all vehicles. This combination allows for an efficient classification of the existing vehiclelane and vehicle-vehicle relations in a traffic scene and thus substantially improves the understanding of complex traffic scenes. We systematically propagate probabilities and variances within our network which results in probabilistic sets of the modeled driving maneuvers. Using this generic approach, we are able to classify a total of 27 driving maneuvers including merging and object following. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2011 UR - https://www.researchgate.net/publication/249023568_Object-Oriented_Bayesian_Networks_for_Detection_of_Lane_Change_Maneuvers#fullTextFileContent U6 - https://doi.org/10.1109/IVS.2011.5940468 IS - 4(3) SP - 19 EP - 31 ER - TY - CHAP A1 - Weidl, Galia A1 - Breuel, Gabi T1 - Overall Probabilistic Framework for Modeling and Analysis of Intersection Situations T2 - Advanced Microsystems for Automotive Applications 2012 N2 - We propose a system design for preventive traffic safety in general intersection situations involving all present traffic participants (vehicles and vulnerable road users) in the context of their environment and traffic rules. It exploits the developed overall probabilistic framework for modeling and analysis of intersection situations under uncertainties in the scene, in measured data or in communicated information. It proposes OOBN modeling for the cognitive assessment of potential and real danger in intersection situations and presents schematically an algorithm for multistage cognitive situation assessment. A concept for the interaction between situation assessment and the proposed Proactive coaching Safety Assistance System (PaSAS) is outlined. The assessment of danger in a situation development serves as a filter for the output and intensity of HMI-signals for directing driver's attention to essentials. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2012 UR - https://link.springer.com/chapter/10.1007/978-3-642-29673-4_24 SN - 978-3-642-29673-4 U6 - https://doi.org/10.1007/978-3-642-29673-4_24 SP - 257 EP - 268 PB - Springer ER - TY - JOUR A1 - Kaspar, Dietmar A1 - Weidl, Galia A1 - Dang, Thao A1 - Breuel, Gabi A1 - Tamke, Andreas A1 - Wedel, Andreas A1 - Rosenstiel, Wolfgang T1 - Object-Oriented Bayesian Networks for Detection of Lane Change Maneuvers JF - IEEE Intelligent Transportation Systems Magazine N2 - This article introduces a novel approach towards the recognition of typical driving maneuvers in structured highway scenarios and shows some key benefits of traffic scene modeling with object-oriented Bayesian networks (OOBNs). The approach exploits the advantages of an introduced lane-related coordinate system together with individual occupancy schedule grids for all modeled vehicles. This combination allows an efficient classification of the existing vehicle-lane and vehicle-vehicle relations in traffic scenes and thus substantially improves the understanding of complex traffic scenes. Probabilities and variances within the network are propagated systematically which results in probabilistic sets of the modeled driving maneuvers. Using this generic approach, the network is able to classify a total of 27 driving maneuvers including merging and object following. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Künstliche Intelligenz Y1 - 2012 UR - https://www.researchgate.net/publication/249012939_Object-Oriented_Bayesian_Networks_for_Detection_of_Lane_Change_Maneuvers#fullTextFileContent U6 - https://doi.org/10.1109/MITS.2012.2203229 VL - 2012 IS - 4/3 SP - 19 EP - 31 ER - TY - CHAP A1 - Weidl, Galia A1 - Singhal, Virat A1 - Petrich, Dominik A1 - Kaspar, Dietmar A1 - Wedel, Andreas A1 - Breuel, Gabi T1 - Collision Risk Prediction and Warning at Road Intersections Using an Object Oriented Bayesian Network T2 - 5th International Conference Automotive User Interfaces and Interactive Vehicular Applications (Automotive UI,13), Oct.28-30, 2013 N2 - This paper describes a novel approach to situation analysis at intersections using object-oriented Bayesian networks. The Bayesian network infers the collision probability for all vehicles approaching the intersection, while taking into account traffic rules, the digital street map, and the sensors' uncertainties. The environment perception is fused from communicated data, vehicles local perception and self-localization. Thus, a cooperatively validated set of data is obtained to characterize all objects involved in a situation (resolving occlusions). The system is tested with data, acquired by vehicles with heterogenic equipment (without/with perception). In a first step the probabilistic mapping of a vehicle onto a fixed set of traffic lanes and forward motion predictions is introduced. Second, criticality measures are evaluated for these motion predictions to infer the collision probability. In our test vehicle this probability is then used to warn the driver of a possible hazardous situation. It serves as a likelihood alarm parameter for deciding the intensity of HMI acoustic signals to direct the driver's attention. First results in various simulated and live real-time scenarios show, that a collision can be predicted up to two seconds before a possible impact by applying the developed Bayesian network. The extension of this network to further situation features is the content of ongoing research. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Künstliche Intelligenz Y1 - 2013 UR - https://www.researchgate.net/publication/267764514_Collision_Risk_Prediction_and_Warning_at_Road_Intersections_Using_an_Object_Oriented_Bayesian_Network#fullTextFileContent U6 - https://doi.org/10.1145/2516540.2516577 ER - TY - CHAP A1 - Seeliger, Florian A1 - Weidl, Galia A1 - Petrich, Dominik A1 - Naujoks, Frederik A1 - Breuel, Gabi A1 - Neukum, Alexandra A1 - Dietmayer, Klaus T1 - Advisory warnings based on cooperative perception T2 - IEEE Intelligent Vehicles Symposium Proceedings, June 2014 N2 - The Ko-PER (cooperative perception) research project aims at improvements of active traffic safety through cooperative perception systems. Within the project a prototype of a cooperative warning system was realized. This system provides early advisory warnings which are especially useful in critical situations with occluded conflict partners. The development process was accompanied by a series of driving simulator studies to determine both the potential to reduce traffic conflicts and important design characteristics of early advisory warning signals. The most important details of the prototype system's components inter-vehicle information-fusion and situation analysis are described and the achieved warning timings are compared to the results of the driving simulator studies. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2014 UR - https://www.researchgate.net/publication/264732322_Advisory_warnings_based_on_cooperative_perception#fullTextFileContent U6 - https://doi.org/10.1109/IVS.2014.6856479 ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Kaspar, Dietmar A1 - Breuel, Gabi T1 - Optimizing Bayesian networks for recognition of driving maneuvers to meet the automotive requirements T2 - The 2014 IEEE Multi-Conference on Systems and Control (MSC 2014) N2 - An Object Oriented Bayesian Network for recognition of maneuver in highway traffic has demonstrated an acceptably high recognition performance on a prototype car with a Linux PC having an i7 processor. This paper is focusing on keeping the high recognition performance of the original OOBN, while evaluating alternative modelling techniques and their impact on the memory and time requirements of an ECU-processor for automotive applications. New challenges are faced, when the prediction horizon is to be further extended. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Künstliche Intelligenz Y1 - 2014 UR - https://www.researchgate.net/publication/286570923_Optimizing_Bayesian_networks_for_recognition_of_driving_maneuvers_to_meet_the_automotive_requirements#fullTextFileContent U6 - https://doi.org/10.1109/ISIC.2014.6967630 ER - TY - JOUR A1 - Naujoks, Frederik A1 - Grattenthaler, Heidi A1 - Neukum, Alexandra A1 - Weidl, Galia A1 - Petrich, Dominik T1 - Effectiveness of advisory warnings based on cooperative perception JF - IET Intelligent Transport Systems N2 - Cooperative perception makes it possible – in addition to emergency warnings – to provide drivers with early advisory warnings about potentially dangerous driving situations. Based on research results pertaining to imminent crash warnings, it was expected that the effectiveness of such advisory warnings depends on situation-specific anticipations by the driver. During a simulator study, N = 20 drivers went through a wide range of longitudinal traffic and intersection scenarios. The scenarios varied in the possibility to anticipate traffic conflicts (Anticipation: high vs. low) and were completed under different visibility conditions (Visibility: obstructed vs. visible), with and without driver assistance based on cooperative perception (i.e., visual-auditory advisory warnings two seconds prior to the last-possible warning moment; assistance: no assistance vs. with assistance). The warning concept was based on empirical pre-studies and previously validated on a public test intersection. During non-assisted driving, critical situations were mainly experienced when the possibility to anticipate traffic conflicts was low. Visual obstructions lead to a further increase in the frequency of critical situations. Furthermore, the results indicate a clear mitigation of critical encounters when providing early advisory warnings which is independent from sight obstructions. This applies particularly to surprising and unexpected scenarios and thus illustrates the potential of cooperative perception to enhance active traffic safety. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2015 UR - https://www.researchgate.net/publication/276248479_Effectiveness_of_advisory_warnings_based_on_cooperative_perception#fullTextFileContent U6 - https://doi.org/10.1049/iet-its.2014.0190 VL - 2015 IS - 9 SP - 606 EP - 617 ER - TY - CHAP A1 - Weidl, Galia T1 - Freiraumbewertung für Spurwechselmanöver mit Bayes-Netzen T2 - 7. VDI/VDE Fachtagung AUTOREG Auf dem Weg zum automatisierten Fahren N2 - Kurzfassung Diese Arbeit stellt ein robustes wissensbasiertes Verfahren zur Lückenbewertung für Spur-wechselmanöver vor. Zur Modellierung wurden dynamische Bayes-Netzwerke eingesetzt und mit Hilfe von Lernalgorithmen die Erkennungsleistung verbessert. Die Testergebnisse zeigen eine sehr hohe Trefferquote. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2015 UR - https://www.researchgate.net/publication/279886700_Freiraumbewertung_fur_Spurwechselmanover_mit_Bayes-Netzen#fullTextFileContent ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Tereshchenko, Viacheslav A1 - Kaspar, Dietmar A1 - Breuel, Gabi T1 - Early Recognition of Maneuvers in Highway Traffic T2 - European Conference on Symbolic and Quantitative Approaches to Reasoning and Uncertainty, July 2015 N2 - This paper presents an application of Bayesian networks where early recognition of traffic maneuver intention is achieved using features of lane change, representing the relative dynamics between vehicles on the same lane and the free space to neighbor vehicles back and front on the target lane. The classifiers have been deployed on the automotive target platform, which has severe constraints on time and space performance of the system. The test driving has been performed with encouraging results. Even earlier recognition is possible by considering the trend development of features, characterizing the dynamic driving process. The preliminary test results confirm feasibility. KW - Fahrerassistenzsystem Y1 - 2015 UR - https://www.researchgate.net/publication/300646375_Early_Recognition_of_Maneuvers_in_Highway_Traffic#fullTextFileContent U6 - https://doi.org/10.1007/978-3-319-20807-7_48 ER - TY - CHAP A1 - Weidl, Galia T1 - Early Recognition of Maneuvers in Highway Traffic T2 - The 13th European Conference Symbolic and Qualitative Approaches to Reasoning With Uncertainties, ECSQARU, 15-17 July 2015 N2 - This paper presents an application of Bayesian networks where early recognition of traffic maneuver intention is achieved using features of lane change, representing the relative dynamics between vehicles on the same lane and the free space to neighbor vehicles back and front on the target lane. The classifiers have been deployed on the automotive target platform, which has severe constraints on time and space performance of the system. The test driving has been performed with encouraging results. Even earlier recognition is possible by considering the trend development of features, characterizing the dynamic driving process. The preliminary test results confirm feasibility. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Künstliche Intelligenz Y1 - 2015 UR - https://www.researchgate.net/publication/280244342_Early_Recognition_of_Maneuvers_in_Highway_Traffic#fullTextFileContent ER - TY - JOUR A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Wang, Stevens Ruixi A1 - Kaspar, Dietmar A1 - Karlsen, Martin T1 - Early and Accurate Recognition of Highway Traffic Maneuvers Considering Real-World Application : A Novel Framework Using Bayesian Networks JF - IEEE Intelligent Transportation Systems Magazine N2 - This paper presents a novel application of artificial cognitive systems to traffic scene understanding and early recognition of highway maneuvers. This is achieved by use of Bayesian networks for knowledge representation, to mimic the human reasoning on situation analysis and to manage inherited uncertainties in the automotive domain, that requires efficient and effective analysis of high volume and frequency data streams. The maneuver recognition uses features, analyzing the observed vehicles behavior and available free space on the target lane. Dynamic Bayesian networks (DBN) capture the motion of the own and surrounding vehicles as a dynamic process, following the trend development of lateral motion features. The static and dynamic models for maneuver recognition are statistically evaluated with real highway driving data sequences. The DBN demonstrates earlier recognition (∼ 1.1 seconds) and higher accuracy (1.12% error rate) with more stable performance than the static models. The system is deployed on an experimental vehicle, where a Divide-and-conquer approach to inference in object-oriented Bayesian networks is introduced and its implementation is shown to require computation time of 0.15 milliseconds and ROM memory ∼ 10 2 kilobytes. The promising performance evaluation results are confirmed by test drives in real highway traffic. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Künstliche Intelligenz Y1 - 2018 UR - https://www.researchgate.net/publication/323453898_Early_and_Accurate_Recognition_of_Highway_Traffic_Maneuvers_Considering_Real-World_Application_A_Novel_Framework_Using_Bayesian_Networks#fullTextFileContent U6 - https://doi.org/10.1109/MITS.2018.2842049 VL - 2018 IS - 10/3 SP - 146 EP - 158 ER - TY - CHAP A1 - Weidl, Galia A1 - Madsen, Anders L. A1 - Tereshchenko, Viacheslav A1 - Zhang, Wei A1 - Stevens Ruixi, Wang A1 - Kasper, Dietmar T1 - Situation Awareness and Early Recognition of Traffic Maneuvers T2 - Proceedings of The 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, The 57th SIMS Conference on Simulation and Modelling SIMS 2016 N2 - We outline the challenges of situation awareness with early and accurate recognition of traffic maneuvers and how to assess them. This includes also an overview of the available data and derived situation features,handling of data uncertainties, modelling and the approach for maneuver recognition. An efficient and effective solution, meeting the automotive requirements, is successfully deployed and tested on a prototype car. Test driving results show that earlier recognition of intended maneuver is feasible on average 1 second (and up to 6.72 s) before the actual lane-marking crossing. The even earlier maneuver recognition is dependent on the earlier recognition of surrounding vehicles. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem Y1 - 2018 UR - https://www.researchgate.net/publication/329785176_Situation_Awareness_and_Early_Recognition_of_Traffic_Maneuvers#fullTextFileContent U6 - https://doi.org/10.3384/ecp171428 ER - TY - CHAP A1 - Jarosch, Oliver A1 - Naujoks, Frederik A1 - Wandtner, Bernhard A1 - Gold, Christian A1 - Marberger, Claus A1 - Weidl, Galia A1 - Schrauf, Michael T1 - The Impact of Non-Driving Related Tasks on Take-over Performance in Conditionally Automated Driving – A Review of the Empirical Evidence T2 - 9. Tagung Automatisiertes Fahren, München, Partner TÜV Süd, November 2019 N2 - Conditional automated driving (CAD) systems (SAE level 3) will soon be introduced to the public market. This automation level is designed to take care of all aspects of the dynamic driving task in specific application areas and does not require the driver to continuously monitor the system performance. However, in contrast to higher levels of automation the "fallback-ready" user always has to be able to regain control if requested by the system. As CAD allows the driver to engage in non-driving-related tasks (NDRTs) past human factors research has looked at their effects on takeover time and quality especially in short-term takeover situations. In order to understand how takeover performance is impacted by different NDRTs, this paper summarizes and compares available results according to the NDRT's impact on the sensoric, motoric and cognitive transition. In addition, aspects of arousal and motivation are considered. Due to the heterogeneity of the empirical work and the available data practically relevant effects can only be attested for NDRTs that cause severe discrepancies between the current driver state and the requirements of the takeover task, such as sensoric and motoric unavailability. The paper concludes by discussing methodological issues and recommending the development of standardized methods for the future. KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Fahrerassistenzsystem KW - Autonomes Fahrzeug Y1 - 2019 UR - https://www.researchgate.net/publication/338644809_The_Impact_of_Non-Driving_Related_Tasks_on_Take-over_Performance_in_Conditionally_Automated_Driving_-_A_Review_of_the_Empirical_Evidence#fullTextFileContent ER - TY - CHAP A1 - Raiyn, Jamal A1 - Weidl, Galia T1 - Naturalistic Driving Studies Data Analysis Based on a Convolutional Neural Network T2 - VEHITS 2023: 9th International Conference on Vehicle Technology and Intelligent Transport Systems N2 - The new generation of autonomous vehicles (AVs) are being designed to act autonomously and collect travel data based on various smart devices and sensors. The goal is to enable AVs to operate under their own power. Naturalistic driving studies (NDSs) collect data continuously from real traffic activities, in order not to miss any safety-critical event. In NDSs of AVs, however, the data they collect is influenced by various sources that degrade their forecasting accuracy. A convolutional neural network (CNN) is proposed to process a large amount of traffic data in different formats. A CNN can detect anomalies in traffic data that negatively affect traffic efficiency and identify the source of data anomalies, which can help reduce traffic congestion and vehicular queuing. KW - Autonomes Fahrzeug KW - Künstliche Intelligenz Y1 - 2023 UR - https://www.researchgate.net/publication/368332673_Naturalistic_Driving_Studies_Data_Analysis_Based_on_a_Convolutional_Neural_Network#fullTextFileContent U6 - https://doi.org/10.5220/0011839600003479 ER - TY - CHAP A1 - Chaar, Mohamad Mofeed A1 - Weidl, Galia A1 - Raiyn, Jamal T1 - Analyse the effect of fog on the perception T2 - Conference: International Symposium on Transportation Data & Modelling (ISTDM 2023) KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Autonomes Fahrzeug KW - Fahrerassistenzsystem KW - Nebel Y1 - 2023 UR - https://www.researchgate.net/publication/369484982_Analyse_the_effect_of_fog_on_the_perception#fullTextFileContent ER - TY - CHAP A1 - Weidl, Galia A1 - Raiyn, Jamal A1 - Berres, Stefan T1 - Does a livable city profit from a shared CCAM Shuttle Bus on demand? T2 - International Symposium on Transportation Data & Modelling (ISTDM2023), June 2023 N2 - Livable cities measure quality-of-life factors such as transportation, convenience of daily life, education, and a safe and stable built and natural environment. Livability of a city includes also some social and psychological factors, like emotion and perception. How do we realize the advantages of new technology under mixed traffic conditions, while observing all daily requirements on safety, convenience and high education needs? KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Stadtentwicklung KW - Stadtplanung KW - Digitalisierung Y1 - 2023 UR - https://www.researchgate.net/publication/370492569_Does_a_livable_city_profit_from_a_shared_CCAM_Shuttle_Bus_on_demand#fullTextFileContent ER - TY - CHAP A1 - Valencia, Yeimy A1 - Normann, Marc A1 - Sapsai, Iryna A1 - Abke, Jörg A1 - Madsen, Anders L. A1 - Weidl, Galia T1 - Learning Style Classification by Using Bayesian Networks Based on the Index of Learning Style T2 - ECSEE '23: Proceedings of the 5th European Conference on Software Engineering Education, June 2023 KW - Lernstil KW - Fragebogen Y1 - 2023 U6 - https://doi.org/10.1145/3593663.3593685 SP - 73 EP - 82 ER - TY - CHAP A1 - Rötzel, Peter T1 - Nachhaltige Unternehmenssteuerung T2 - Nachhaltigkeitsmanagement kompakt N2 - Erste Schritte zur Implementierung eines Nachhaltigkeitsmanagements im Unternehmen Dieser kompakte Band geht auf zentrale Prinzipien und Konzepte ein, die Unternehmen helfen, ein Nachhaltigkeitsmanagement aufzubauen und weiterzuentwickeln. Darüber hinaus bietet er einen Überblick über die verschiedenen Ansätze und Instrumente des Nachhaltigkeitsmanagements, damit Unternehmen ihre Aktivitäten analysieren, bewerten und verbessern können, um ökologische und soziale Auswirkungen zu reduzieren und langfristige Wertschöpfung zu ermöglichen. Diese grundlegende Einführung richtet sich an die Führungskräfte in den Unternehmen, die sich mit Fragen des Umwelt- und Nachhaltigkeitsmanagements beschäftigen. Zunächst werden die relevanten normativen und regulativen Anforderungen an das unternehmerische Nachhaltigkeitsmanagement vorgestellt, bevor konkret erste Schritte zur Implementierung eines Nachhaltigkeitsmanagements entwickelt werden. Die beiden letzten Kapitel stellen ein geeignetes Steuerungssystem sowie die Grundlagen der Nachhaltigkeitskommunikation eines Unternehmens vor. KW - Unternehmensplanung KW - Nachhaltigkeit KW - Management KW - Nachhaltigkeitscontrolling KW - Unternehmenssteuerung KW - Management Control Systems KW - Sustainability Y1 - 2023 SP - 59 EP - 76 PB - Vahlen CY - München ER - TY - CHAP A1 - Raiyn, Jamal A1 - Weidl, Galia T1 - Improving Autonomous Vehicle Reasoning with Non-Monotonic Logic: Advancing Safety and Performance in Complex Environments T2 - IEEE International Smart Cities Conference (ISC2) KW - ITS (Intelligent Transportation Systems) KW - Artificial Intelligence KW - Künstliche Intelligenz KW - Autonomes Fahrzeug Y1 - 2023 UR - https://www.researchgate.net/publication/375128760_Improving_Autonomous_Vehicle_Reasoning_with_Non-Monotonic_Logic_Advancing_Safety_and_Performance_in_Complex_Environments U6 - https://doi.org/10.1109/ISC257844.2023.10293463 ER - TY - BOOK A1 - Borgeest, Kai T1 - Elektronik in der Fahrzeugtechnik: Hardware, Software, Systeme und Projektmanagement N2 - Das Buch vermittelt die Grundlagen, um die Besonderheiten der Elektronik und Software im Kfz nicht nur zu kennen, sondern auch zu verstehen. Zusätzlich wird an Beispielen die Komplexität realer Systeme im Fahrzeug vorgeführt und gezeigt, welche Anwendungen durch die Elektronik erst möglich werden. Das Spannungsfeld zwischen Sicherheit, Zuverlässigkeit und Komplexität prägt in Verbindung mit branchenüblichen Abläufen das Vorgehen bei der Entwicklung, das ein in diesem Bereich tätiger Ingenieur verstehen muss. KW - Kraftfahrzeugelektronik KW - Kfz-Elektronik KW - Steuergerät KW - CAN-Bus Y1 - 2023 SN - 978-3658414825 U6 - https://doi.org/https://doi.org/10.1007/978-3-658-41483-2 PB - ‎Springer Vieweg CY - Wiesbaden ER - TY - CHAP A1 - Sauer, Timm A1 - Spielmann, Luca A1 - Gorks, Manuel A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Model Predictive Control of Industrial Trucks with AI-based Plant Model Selection T2 - 9th International Conference on Control, Decision and Information Technologies (CoDIT) N2 - In this paper, a new control concept for automatic track guidance of forklifts within a heterogeneous logistics fleet is presented. The proposed control scheme is universally applicable and based on Artificial Intelligence (AI). The lateral control is realized using a Model Predictive Controller (MPC). In order to take into account the diversity of the industrial truck variants, a multi-model approach is used. Therefore, a plant model for each truck variant is integrated into the MPC. In a practical application, the most suitable model has to be selected. This decision is based on AI in the form of an Artificial Neural Network (ANN). It is able to distinguish the different truck variants based on that part of the plant's state vector, which represents the vehicle dynamic characteristics. Thus, the appropriate model can be used, which significantly improves the control quality and guarantees an accurate track guidance of different forklifts. Due to the AI-based selection of the model, the computational effort can be kept low and real-time capability can be ensured. In order to classify the performance of the proposed control concept, its simulation results are compared to the closed-loop behavior, using a classical MPC. KW - automatic control KW - robust control KW - AI KW - ANN KW - Flurförderer KW - Künstliche Intelligenz Y1 - 2023 UR - https://ieeexplore.ieee.org/abstract/document/10284427 U6 - https://doi.org/10.1109/CoDIT58514.2023.10284427 VL - 2023 IS - Conference Proceedings SP - 263 EP - 268 ER - TY - INPR A1 - Schork, Sabrina A1 - Özdemir-Kaluk, Dilan A1 - Zerey, Cudi T1 - An integrative definition of digital, innovation, and sustainable: A bridge between disciplines N2 - It needs to be clarified how digital, innovation, and sustainable concepts are interdependent and what dimensions they encompass from an organizational perspective. This article aims to fill these gaps. 12,249 articles are analyzed, of which 776 are minimum C-ranked according to VHB-Jourqual, and 457 pass the quality filters. Only 48 publications deal with all three concepts, and 24 offer definitions. This results from an eight-step systematic literaturereview. Three dimensions for 'digital' (data, technologies, and networks), three dimensions for ‘sustainable’(environmental, social, and economic), and four dimensions for ‘innovation’(product, service, business model, and process) are elaborated in a framework. Based on this, an integrated definition is derivedusing a content analysis.The DIS-definition can be used for strategic decision-making processes and bridges the disciplines of technology, innovation, and sustainability management. Finally, a canvas that clarifies the concepts and their connections is proposed for interdisciplinary management discussions. KW - Digital, Innovation, Sustainability, Systematic Literature Review, Content KW - Digitalisierung KW - Innovation KW - Nachhaltigkeit KW - Konzeption Y1 - 2023 UR - https://zenodo.org/records/10143498 U6 - https://doi.org/10.5281/zenodo.10143498 ER - TY - GEN A1 - Eder, PA A1 - Jouanne-Diedrich, Holger K. von A1 - Rashid, A A1 - Soda, H T1 - Der präklinische 4 Item Stroke Scale (4I SS) und die Thrombektomie N2 - Der4I-SS zeigt eine moderate bis hohe diagnostische Genauigkeit in Bezug auf EVTs von Patienten mit akuten Schlaganfä̈llen. Die Implementierung kann zur Verbesserung der Patientenversorgung und Ressourcenallokation beitragen. N2 - Poster KW - Schlaganfall KW - Telemedizin Y1 - 2023 ER - TY - JOUR A1 - Link, Renate T1 - Global Remote Events (GRE) in Science & Higher Education (HE) with a Focus on Intercultural Aspects JF - mondial SIETAR Journal für interkulturelle Perspektiven KW - Hochschulbildung KW - Interkulturelles Verstehen KW - Videokonferenz Y1 - 2022 VL - 28(2022) IS - 1 SP - 47 EP - 52 ER - TY - CHAP A1 - Link, Renate T1 - The Voice of Women in Higher Education: Current Perspectives of Students in Germany, Japan and Taiwan. A Contrastive Analysis of Western and Eastern Perceptions of Women Empowerment and Gender Roles Among Students T2 - Women's Empowerment for a Sustainable Future KW - Hochschulbildung KW - Frau Y1 - 2023 VL - 2023 SP - 243 EP - 269 ER - TY - BOOK A1 - Link, Renate T1 - English for Travel and Tourism BT - Lehrerband KW - Englisch KW - Fachsprache KW - Tourismus Y1 - 2010 SN - 978-3-8045-5076-6 ER - TY - BOOK A1 - Link, Renate T1 - English for Travel and Tourism BT - SChülerband KW - Englisch KW - Fachsprache KW - Tourismus Y1 - 2010 SN - 978-3-8045-5075-9 VL - 2010 PB - Winkler CY - Braunschweig ER - TY - GEN A1 - Jost, Thomas T1 - Missbraucht nicht die Mindestreserve! N2 - Der Vorschlag einer drastischen Erhöhung des Mindestreservesatzes durch die EZB erhitzt die Gemüter. Nach teils heftiger Kritik hochrangiger Bankenvertreter in Deutschland werden die „üblichen“ Beschuldigungen vorgebracht und von Medien z.T. unreflektiert wiedergegeben bzw. kommentiert. Die Banken erhielten seit Herbst 2022 – so das gängige Muster - risikolose und ungerechte Subventionen und wüssten nichts Besseres mit ihren Einlagen bei der Bundesbank anzufangen. Diese Kritik greift zu kurz und ist teils sachlich falsch. KW - Mindestreservesatz KW - Mindestreservepolitik Y1 - 2023 ER - TY - CHAP A1 - Hudec, Rene A1 - Pomahač, Vit A1 - Stanik, Eva A1 - Döhring, Thorsten A1 - Schilling, Klaus T1 - Space Telescopes based on Satellite Tandem Flights T2 - DGaO Proceedings N2 - Progress in satellite control engineering enables tandem flight arrangements of mini-satellites in future space missions. Cost effective CubeSat technologies offer an interesting possibility for space-born telescope payloads. Two small satellites will carry the telescope optics and the detector system, respectively. Related formation flight requirements could be transferred from the NetSat-Mission. KW - Astronomy KW - CubeSat KW - Satellite KW - Tandem Flight KW - Telescope KW - Röntgenteleskop KW - Kleinsatellit Y1 - 2023 UR - https://www.dgao-proceedings.de/download/124/124_p29.pdf SN - 1614-8436 VL - 2023 ER - TY - JOUR A1 - Alves, Caroline A1 - Toutain, Thaise A1 - Porto, Joel A1 - Aguiar, Patricia A1 - de Sena, Eduardo A1 - Rodrigues, Francisco A. A1 - Pineda, Aruane M. A1 - Thielemann, Christiane T1 - Analysis of functional connectivity using machine learning and deep learning in different data modalities from individuals with schizophrenia JF - Journal of Neural Engineering N2 - Objective. Schizophrenia (SCZ) is a severe mental disorder associated with persistent or recurrent psychosis, hallucinations, delusions, and thought disorders that affect approximately 26 million people worldwide, according to the World Health Organization. Several studies encompass machine learning (ML) and deep learning algorithms to automate the diagnosis of this mental disorder. Others study SCZ brain networks to get new insights into the dynamics of information processing in individuals suffering from the condition. In this paper, we offer a rigorous approach with ML and deep learning techniques for evaluating connectivity matrices and measures of complex networks to establish an automated diagnosis and comprehend the topology and dynamics of brain networks in SCZ individuals. Approach. For this purpose, we employed an functional magnetic resonance imaging (fMRI) and electroencephalogram (EEG) dataset. In addition, we combined EEG measures, i.e. Hjorth mobility and complexity, with complex network measurements to be analyzed in our model for the first time in the literature. Main results. When comparing the SCZ group to the control group, we found a high positive correlation between the left superior parietal lobe and the left motor cortex and a positive correlation between the left dorsal posterior cingulate cortex and the left primary motor. Regarding complex network measures, the diameter, which corresponds to the longest shortest path length in a network, may be regarded as a biomarker because it is the most crucial measure in different data modalities. Furthermore, the SCZ brain networks exhibit less segregation and a lower distribution of information. As a result, EEG measures outperformed complex networks in capturing the brain alterations associated with SCZ. Significance. Our model achieved an area under receiver operating characteristic curve (AUC) of 100% and an accuracy of 98.5% for the fMRI, an AUC of 95%, and an accuracy of 95.4% for the EEG data set. These are excellent classification results. Furthermore, we investigated the impact of specific brain connections and network measures on these results, which helped us better describe changes in the diseased brain. KW - Maschinelles Lernen KW - Schizophrenie KW - Deep learning Y1 - 2023 U6 - https://doi.org/10.1088/1741-2552/acf734 VL - 2023 IS - 20/5 SP - 0 EP - 0 ER - TY - JOUR A1 - Pfeifenberger, Hemma T1 - Intermittierende Auskultation – eine alte Technik neu erlernen N2 - Einschlägige Richtlinien empfehlen die intermittierende Auskultation als Überwachungsmethode erster Wahl bei Nicht-Risiko-Schwangeren. Hierfür müssen bestimmte Rahmenfaktoren gegeben sein sowie die Fachexpertise der betreuenden Hebamme. Diese lässt sich durch entsprechende Fortbildung erlangen. KW - Herzfrequenz KW - Messung KW - Fetus Y1 - 2023 UR - https://www.thieme-connect.de/products/ejournals/abstract/10.1055/a-2106-6061 U6 - https://doi.org/10.1055/a-2106-6061 ER - TY - BOOK A1 - Borgeest, Kai T1 - Manipulation von Abgaswerten N2 - Dieses kleine Buch stellt Hintergründe zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuergeräte, Abgasrückführung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Prüfstand möglich sind, mit welchen Fahrzyklen getestet wird und in welchem rechtlichen und politischen Umfeld dies lange Zeit unbemerkt mit unterschiedlichen Konsequenzen in der EU und den USA geschehen konnte. Es werden Maßnahmen vorgestellt, mit denen Fahrzeuge auch real gesetzliche Grenzwerte einhalten können und wie Manipulationen zukünftig rechtlich und politisch verhindert werden können. Dem Leser werden durch Literaturhinweise zusätzliche Details erschlossen. KW - Abgasemmission KW - Grenzwert KW - Kraftfahrzeugelektronik KW - Messung KW - Wirtschaftskriminalität KW - Abgas KW - Steuergerät KW - Verbrennungsmotor KW - Stickstoffoxide KW - Betrug Y1 - 2023 SN - 978-3-658-41304-0 U6 - https://doi.org/https://doi.org/10.1007/978-3-658-41305-7 PB - Springer Vieweg CY - Wiesbaden ER - TY - RPRT A1 - Schork, Sabrina A1 - Schleiss, Johannes A1 - Mah, Dana-Kristin A1 - Böhme, Katrin A1 - Fischer, David A1 - Mesenhöller, Janne A1 - Paaßen, Benjamin A1 - Schrumpf, Johannes T1 - Künstliche Intelligenz in der Bildung: Drei Zukunftsszenarien und fünf Handlungsfelder N2 - Die voranschreitende Digitalisierung und insbesondere der Einsatz von Künstlicher Intelligenz (KI) in der Bildung eröffnen neue Möglichkeiten des Lernens. Bildung kann stärker individuell sowie zeitlich und räumlich entgrenzt stattfinden. ChatGPT verdeutlicht, wie dynamisch die Entwicklungen im Bereich KI sind. Das in Zunahme begriffene Interesse am Thema KI allgemein sowie KI in der Bildung kommt dem erforderlichen Austausch zwischen zentralen Akteur:innen zugute. Dieses Diskussionspapier präsentiert drei Zukunftsszenarien für den Einsatz von KI in der institutionellen Bildung: Hochschule, Weiterbildung und Schule. Im Fokus stehen die übergeordneten Fragestellungen nach Voraussetzungen und Gelingensbedingungen einer erfolgreichen Anwendung sowie nach gemeinsamen Handlungsfeldern für zentrale Stakeholder. Fünf Handlungsfelder für den Einsatz von KI in institutioneller Bildung sind auf Grundlage der skizzierten Zukunftsszenarien hervorzuheben: (1) Interdisziplinäre Zusammenarbeit, (2) Qualifizierungsangebote und Kompetenzentwicklung, (3) Digitale Infrastruktur und Personal, (4) Ethik und Datensouveränität sowie (5) Interoperabilität von Daten in Bildungskontexten. Ziel des vorliegenden Diskussionspapiers ist es, den kooperativen Austausch zwischen relevanten Stakeholdern anzuregen. KW - Künstliche Intelligenz KW - Bildungswesen KW - Digitalisierung Y1 - 2023 UR - https://zenodo.org/record/7702620 VL - Diskussionspapier / März 2023 ER - TY - INPR A1 - Schork, Sabrina A1 - Langemeyer, Ines A1 - Schmitt, Franz-Josef T1 - Identification of Motivated and Creative Highly Gifted People: Development of the CMAC-Test N2 - The following contribution deals with the environmental conditions of highly gifted and sensitive people (HGSP). Three researchers from different perspectives (physics, pedagogy, and innovation management) empathize with the target group and try to understand their experiences. From three interviews with adults, a first point of view is defined adopting the Grounded Theory methodology. Adult interviews are compared with the perceptions of an adolescent from today moving between state and private education systems. By comparing both perspectives, differences and similarities are worked out. The discussions are used to develop an online test focusing on creativity, motivation for achievement, and cognitive capacities, as these are core categories identified that seem to be highly important in combination. The empirical test is intended to provide the state education system with a simple and interactive solution to identify a large group of people who need further support. To achieve a high participation rate, the test will be designed for a maximum of one hour and the implementation and evaluation will be carried out digitally. The authors' vision is to create an adaptive environment that can effectively adjust to and educate diverse groups of learners without over- or under burdening teachers and learners. A key finding of our case-based research is that the existing school and higher education structures are not able to provide sufficient support and challenge for HGSP. Support measures for HGSP are needed as well as a new understanding of learning and teaching, so that new competencies can be built that consider people's self-regulation, creativity, and motivation for achievement, in addition to cognition and meta-cognition. Kuhl (2004, 18) explains why the capacities of self-regulation are paramount for highly gifted students. When they want to meet a challenge, they face problems that are more difficult and therefore need more persistence, resilience, and self� motivation. However, to support these special needs, teachers are often not ready or capable to do so, nor do these needs fit with the performance requirements of the regular curriculum. KW - Hochbegabung KW - Innovationsmanagement Y1 - 2022 UR - https://zenodo.org/record/7368147#.Y4NMyX2ZNmM ER - TY - CHAP A1 - Schork, Sabrina T1 - Circular Innovator Education T2 - Ability to Act N2 - The following article is a first step towards raising the awareness of these new trainers (who are conscious and innovators themselves) and giving them methods, tools, and inspiration to develop sustainable innovators to think holistically. Innovators are the proportion of entrepreneurs who do not copy or optimize what already exists but commercialize new technologies or new ideas. Circular innovators are the doers who create systemic innovations solving our current social and ecological crisis. KW - Innovationsmanagement Y1 - 2021 VL - 2021 SP - 105 EP - 124 PB - BoekenGilde CY - Enschede, Netherlands ER - TY - CHAP A1 - Schork, Sabrina T1 - Innovation Leadership in the Digital Enterprise: Lessons From Pioneers T2 - Handbook of Research on Management and Strategies for Digital Enterprise Transformation N2 - In this chapter, the EIL (Effective Innovation Leadership) framework is tested empirically. First, peer-reviewed journals in the innovation management, leadership, and transformation discipline are analyzed. Second, a pre-test with 58 executives takes place. The response behavior of the participants varies depending on the company's degree of digital maturity. Third, 20 innovation leaders employed in mature digital companies answer the survey. The participants perceive their company as innovative and state that up to 89% of created innovations are digital. Values relevant to digital innovation leaders are innovation, responsibility, positivity, and transparency. Relevant strengths are creativity and learning. Both strongly correlate with a few efficacy items. Decisiveness correlates with innovation strategy. Entrepreneurship, self-regulation, and culture correlate with each other. Creativity connects the value of innovation and the practice of communication. The insights from this chapter contribute to building a reliable and valid factor-based effective digital innovation leadership questionnaire in the future. KW - Innovationsmanagement KW - Digitalisierung KW - Führung Y1 - 2021 UR - https://www.igi-global.com/chapter/innovation-leadership-in-the-digital-enterprise/273781 SP - 86 EP - 109 PB - IGI Global CY - Hershey, Pennsylvania, USA ER - TY - CHAP A1 - Schork, Sabrina T1 - Application of the Effective Innovation Leadership Model in a Digital Innovation Project: Case Study T2 - Digital Innovations for Customer Engagement, Management, and Organizational Improvement N2 - Germany has become sedate and partially missed digital opportunities generating value. Since 1995, the term innovation leadership is getting increasing attention. Still, there exists no clear definition. The effective innovation leadership (EIL) model resulted from a Ph.D. thesis and is grounded in the iteration of six data sets. It has been used in industry since 2014. This chapter examines the application of the EIL model in one German middle-class enterprise in 2018/2019. Core challenges in the systemic context, which hinder the effectiveness of innovation leadership in the organizational context, are the support of people across functions and hierarchies as well as inflexible structures and digital access. Especially negative pressure coming from an overvaluation of the shareholder, egos fighting for power, extensive drama triangular, fixed mindsets, and freeloaders hinder the effectiveness of innovation leadership. A comparison of the EIL model with rival theory shows that innovation leadership is close to entrepreneurial approaches and an integral part of innovation management. KW - Kundenbindung KW - Digitalisierung KW - Innovationsmanagement Y1 - 2020 UR - https://www.igi-global.com/chapter/application-of-the-effective-innovation-leadership-model-in-a-digital-innovation-project/255050 SP - 20 EP - 45 PB - IGI Global CY - Hershey, Pennsylvania, USA ER - TY - CHAP A1 - Kätker, Anna A1 - Schreiber, Kai A1 - Busch, Uwe A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - Unsichtbares erkunden - Experimente im Museumslabor RöLab des Deutschen Röntgen-Museums N2 - Das RöLab versteht sich als ein überregionales, außerschulisches Bildungsangebot, das Begeisterung für Natur- und Ingenieurwissenschaften, Medizin und Medizintechnik an unterschiedliche Zielgruppen vermittelt und damit einen Beitrag zur Allgemeinbildung und MINT-Förderung leistet. Das didaktische Konzept nimmt den „Hands-on-Science“ Gedanken stringent auf, weckt den Forschergeist und ermöglicht es den Lernenden, Unsichtbares zu erkunden. KW - Wilhelm Conrad Röntgen KW - Museum KW - Röntgenstrahlung KW - MINT KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Deutsches Röntgen-Museum KW - Röntgenstrahlung Y1 - 2023 UR - https://www.dgao-proceedings.de/download/124/124_p30.pdf SN - 1614-8436 VL - 2023 IS - 124 SP - 1 EP - 2 PB - DGaO Proceedings ER - TY - CHAP A1 - Busch, Uwe A1 - Kätker, Anna A1 - Schreiber, Kai A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - Hommage auf einen bedeutenden Wissenschaftler - das Deutsche Röntgen-Museum T2 - DGaO Proceedings N2 - 2023 jährte sich der Todestag von Wilhelm Conrad Röntgen zum einhundertsten Mal. Im Jahr 1895 entdeckte er eine neue Art von Strahlung, die feste Materialien durchdringen kann. 1901 erhielt er für diese Entdeckung den ersten Nobelpreis für Physik. Das Deutsche Röntgen-Museum erforscht und dokumentiert das Leben und Werk von W. C. Röntgen und die Auswirkungen seiner Entdeckung. KW - Wilhelm Conrad Röntgen KW - Museum KW - Wissenschaftsgeschichte KW - Röntgenstrahlung KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Deutsches Röntgen-Museum KW - Röntgenstrahlung Y1 - 2023 UR - https://www.dgao-proceedings.de/download/124/124_p31.pdf SN - 1614-8436 VL - 2023 IS - 124 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Pomahac, Vit A1 - Hudec, Rene A1 - Döhring, Thorsten T1 - CubeSat tandem flight for asteroid surveillance T2 - SPIE Proceedings N2 - Conventional mining might not be sufficient to support the growth of humankind which is heavily dependent upon rare materials in technical applications. Asteroid mining might be an answer, with Near-Earth objects (NEOs) being the first targets. However, the first step in the asteroid mining cascade is to probe reachable asteroids. Moreover, to identify the best candidates for further activities hundreds to thousands of asteroids must be screened. The fast progressing development of CubeSats might allow the space community to do the initial in-situ screening in a minimalistical and economical manner. Additionally, formation flying might enable the miniaturization of optical payloads for asteroid composition analysis in CubeSats. The recent developments in formation flying are summarised in this study and the possibility of utilizing formation flying CubeSats for asteroid surveillance explored. KW - asteroid surveillence KW - asteroid mining KW - formation flight KW - tandem flight KW - CubeSat KW - Planetoid KW - Rohstoffgewinnung KW - Kleinsatellit Y1 - 2023 U6 - https://doi.org/doi: 10.1117/12.2672396 VL - 2023 IS - 12576 SP - 125760H-1 EP - 125760H-5 PB - SPIE ER - TY - CHAP A1 - Stanik, Eva A1 - Döhring, Thorsten A1 - Schreiber, Kai A1 - Kätker, Anna A1 - Busch, Uwe T1 - The Röntgen Medal: honouring X-ray excellence T2 - SPIE Proceedings N2 - Starting in 1951, the 50th anniversary of the award of the first Nobel Prize for physics to Wilhelm Conrad Röntgen, the Lord Mayor of the German City of Remscheid has given out Röntgen Medals. The Röntgen Medal annually honours scientists who "in the broadest sense have made a special contribution to the progress and dissemination of X-ray discoveries in the theoretical and applied sciences". The Röntgen Medal has become highly recognized in the scientific world. To date, more than one hundred excellent scientists have received the honour. Through their chronology, this contribution presents a "Who’s Who" of X-ray science and provides selected insights into their scientific work; with the fields of X-ray optics and X-ray astronomy receiving special focus. KW - Röntgen medal KW - X-ray optics KW - X-ray astronomy KW - science history KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Auszeichnung KW - Röntgenoptik KW - Röntgenastronomie Y1 - 2023 U6 - https://doi.org/doi: 10.1117/12.2665424 VL - 2023 IS - 12576 SP - 1257608-1 EP - 1257608-8 PB - SPIE ER - TY - CHAP A1 - Schreiber, Kai A1 - Kätker, Anna A1 - Busch, Uwe A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - A guided tour of the Deutsches Röntgen-Museum: displaying X-ray history T2 - SPIE Proceedings N2 - In 1895, Professor Wilhelm Conrad Röntgen detected a new type of radiation that was able to penetrate solid materials, which he called X-rays. In 1901 Röntgen received the first Nobel Prize in physics in honour of this ground breaking discovery. The Deutsches Röntgen-Museum (DRM) in Remscheid (Germany) is the institution that uniquely and comprehensively explores and documents the life and work of W. C. Röntgen and the impact of his discovery. The DRM’s location in Remscheid is not coincidental, with Röntgen’s birthplace only a short walk away from the exhibits. Every visit to the museum amounts to a unique expedition through the worlds of medicine, science and technology. The museum’s emphasis on the diversity of Röntgen’s invention by a multilingual, multi-medial approach enables all visitors to make their own personal discoveries. The Deutsches Röntgen-Museum in Remscheid is a must-see for X-ray scientists from anywhere in the world. This contribution provides an insight into the history of X-rays and offers a guided tour of the Deutsches Röntgen-Museum and its exhibits. KW - Wilhelm Conrad Röntgen KW - X-ray KW - science history KW - education KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Röntgenstrahlung KW - Deutsches Röntgen-Museum Y1 - 2023 U6 - https://doi.org/doi: 10.1117/12.2665419 VL - 2023 IS - 12576 SP - 125760A-1 EP - 125760A-9 PB - SPIE ER - TY - JOUR A1 - Rötzel, Peter A1 - Roetzel, Lina T1 - “Tis Early Practice only Makes the Master”: Nature and Nurture in Economic Thinking During School Time – A Research Note on Economics Education JF - Open Education Studies N2 - In this article, we contribute to the longstanding debate among economists regarding the question of “nature or nurture” with respect to economics students’ attitudes toward various allocation mechanisms for a scarce resource. While previous research starts the debate by beginning with first-year economics students, we aim to evaluate pre-firstyear individuals, i.e., school pupils. Drawing on the seminal works of Haucap, J., & Just, T. (2010). Not guilty? Another look at the nature and nurture of economics students. European Journal of Law and Economics, 29(2), 239–254 and Frey, B. S., Pommerehne,W.W., & Gygi, B. (1993). Economics indoctrination or selection? Some empirical results. The Journal of Economic Education, 24(3), 271–281, we investigate a sample of pupils ranging from the 5th to the 13th grades to determine whether pupils are “born economists” (nature), develop economic thinking (nurture), or both. We find that young individuals start to think differently in early grades and that their thinking and attitudes are shaped differently throughout their school careers, thereby providing support for the effects of both nature and nurture. Our findings show that school time impacts fairness judgments, particularly regarding price mechanisms. Regarding learning or indoctrination, we find that economics-inclined pupils are positively affected by lessons in economics in school, while pupils who are economics-averse draw completely diametric conclusions from economics lessons, thereby exhibiting increased disapproval of price allocation over the course of these classes and increased approval of the first come, first served and governmental action mechanisms.Moreover, we find strong effects of gender and migration background in this context. This study is the first to elucidate the development of economic thinking in 5th–13th grade pupils. Our results are important for economists, educators, and researchers because they can serve as a starting point for subsequent investigations in this under-researched field. KW - Education KW - Fairness KW - Wirtschaftliches Verhalten KW - Schüler KW - Wirtschaftsstudent Y1 - 2023 UR - https://doi.org/10.1515/edu-2022-0188 U6 - https://doi.org/10.1515/edu-2022-0188 VL - 6 IS - 1 SP - 1 EP - 14 ER - TY - JOUR A1 - Weithmann, Sabrina A1 - Luedtke, Susann T1 - Evaluating the impact of deviating technical standards on business processes, trade and innovation JF - Journal of Standardisation N2 - Surrounding the increasingly intense discussions about the emergence of new global standardization regimes in context of China’s rise as a dominant standardization power, there has been much talk about countries purposefully using deviating national standards to impose trade barriers. The discussion of whether and to what degree technical standards deviate from international standards and how this affects business, trade, innovation and the standard system is of global relevance. As research about the impact of deviating technical standards is still strongly underrepresented in the academic community, this research analyses the different “degrees” of deviation and the respective impact of minor or negligible deviation and strong deviation on businesses trading in a global context. By using a mixed research method based on literature review, analysis of standard documents and semi-structured interviews, this study discusses peculiarities and challenges associated with deviating technical standards. This is of relevance with regards to international trade and especially trade with countries that became increasingly important players in the international standardization regime. Our research will therefore add further insights to a better understanding of the close linkage between economic growth and standardization. This paper further highlights how deviating technical standards impact companies around the globe and how these companies could use a newly developed risk indicator to not only engage in the standard game but also to better assess consequences. KW - Normung KW - standardization KW - deviation KW - technical standard KW - deviating technical standards KW - China KW - Normung Y1 - 2023 UR - https://journals.open.tudelft.nl/jos/article/view/6898 U6 - https://doi.org/https://doi.org/10.18757/jos.2023.6898 VL - 2023 IS - Vol. 2 SP - 1 EP - 28 ER - TY - GEN A1 - Hudec, René A1 - Pomahac, Vit A1 - Döhring, Thorsten A1 - Stanik, Eva A1 - Klaus, Schilling T1 - Space Telescopes based on Satellite Tandem Flights T2 - DGaO Jahrstagung N2 - Due to the recent progress in satellite control engineering, tandem flight arrangements of mini-satellites are currently in discussion and under consideration for future space missions. CubeSat technologies offer an interesting possibility for space-born telescope payloads based on this approach. In such a scenario, two small satellites will fly at a constant distance of a few meters up to 100 meters. Thereby, the front satellite will carry the telescope optics and the second satellite the detector system. Related formation flight requirements were addressed in the NetSat-Mission, composed of four 3U-CubeSats, launched 2020. Space technology challenges concern in particular orbit control by an appropriate propulsion system as well as precision attitude pointing towards the joint target, and could be transferred from the NetSat-mission to the proposed Tandem Mission. This will allow space-based telescopes with a long focal length even placed on board of small or miniature CubeSat-type satellites. Cost effective Kirkpatrick-Baez type X-ray telescopes represent an important application here as they have longer focal lengths compared to previous astronomical observatories using Wolter I type X-ray mirrors. N2 - Poster KW - Satellite KW - CubeSat KW - Tandem Flight KW - Astronomy KW - Telescope KW - Röntgenteleskop KW - Kleinsatellit Y1 - 2023 UR - https://www.dgao-proceedings.de/abstract/abstract_only.php?id=2951 VL - 2023 SP - 1 EP - 1 PB - DGaO ER - TY - GEN A1 - Busch, Uwe A1 - Kätker, Anna A1 - Schreiber, Kai A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - Hommage auf einen bedeutenden Wissenschaftler - das Deutsche Röntgen-Museum T2 - DGaO Jahrestagung N2 - In diesem Jahr jährte sich der Todestag von Wilhelm Conrad Röntgen, gestorben am 10. Februar 1923, zum hundertsten Mal. Dieser Beitrag ist eine Hommage auf diesen bedeutenden deutschen Wissenschaftler. 1895 entdeckte er eine neue Art von Strahlung, welche in der Lage ist, feste Materialien zu durchdringen. 1901 erhielt Professor Röntgen für diese bahnbrechende Entdeckung den ersten Nobelpreis für Physik. Das Deutsche Röntgen-Museum (DRM) erforscht und dokumentiert das Leben und Werk von W. C. Röntgen und die Auswirkungen seiner Entdeckung auf eine einzigartige und umfassende Weise. Der Standort des DRM in Remscheid ist kein Zufall, denn Röntgens Geburtshaus liegt nur wenige Gehminuten von den Exponaten entfernt. Die Betonung der Vielfalt von Röntgens Erfindung durch das Museum mit einer multimedialen Herangehensweise ermöglicht es den Besuchern, hier ihre ganz persönlichen Entdeckungen zu machen. Jeder Museumsbesuch wird so zu einer einzigartigen Entdeckungsreise durch die Welt der Medizin, Wissenschaft und Technik. Dieser Beitrag würdigt das Lebenswerk von Professor Wilhelm Conrad Röntgen und gibt einen Einblick in die Geschichte der Röntgenstrahlen und ihre Anwendungsgebiete. N2 - Poster KW - Röntgen KW - Röntgenstrahlung KW - Museum KW - Deutsches Röntgen-Museum KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Röntgenstrahlung Y1 - 2023 UR - https://www.dgao-proceedings.de/abstract/abstract_only.php?id=2914 VL - 2023 SP - 1 EP - 1 PB - DGaO ER - TY - GEN A1 - Kätker, Anna A1 - Schreiber, Kai A1 - Busch, Uwe A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - Unsichtbares erkunden - Experimente im Museumslabor des Deutschen Röntgen-Museums T2 - DGaO Jahrestagung N2 - „Freude habe ich nur, solange ich es mit dem Experimentieren zu tun habe“, schrieb Wilhelm Conrad Röntgen am 9.6.1920 an Margret Boveri. Das Deutsche Röntgen-Museum und das Remscheider Röntgengymnasium geben getreu diesem Motto Kindern und Jugendlichen die Möglichkeit, selbst aktiv zu werden, zu experimentieren und so auf den Spuren dieses bedeutenden Forschers zu wandeln. Hierzu wurde am 8. November 2011, einem Jahrestag der Entdeckung der Röntgenstrahlen, das Museumslabor RöLab gegründet. Dort werden Themenbrücken in das tägliche Leben geschlagen und so Lernprozesse im MINT-Bereich für die jungen Forschenden anregend, attraktiv und nachhaltig erlebbar. Das RöLab versteht sich als ein überregionales, außerschulisches Bildungsangebot, das Begeisterung für Natur- und Ingenieurwissenschaften, Medizin und Medizintechnik an unterschiedliche Zielgruppen vermittelt und damit einen Beitrag zur Allgemeinbildung und MINT-Förderung leistet. Das didaktische Konzept nimmt den „Hands-on-Science“ Gedanken stringent auf, weckt den Forschergeist und ermöglicht es den Lernenden, Unsichtbares zu erkunden. Dieser Beitrag stellt das Museumslabor RöLab des Deutschen Röntgen-Museums vor. N2 - Poster KW - Röntgenstrahlung KW - MINT KW - Museum KW - Röntgen KW - Deutsches Röntgen-Museum KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Röntgenstrahlung Y1 - 2023 UR - https://www.dgao-proceedings.de/abstract/abstract_only.php?id=2911 VL - 2023 SP - 1 EP - 1 PB - DGaO ER - TY - JOUR A1 - Alves, Caroline A1 - Toutain, Thaise A1 - Aguiar, Patricia A1 - Pineda, Aruane M. A1 - Roster, Kirstin A1 - Thielemann, Christiane A1 - Porto, Joel A1 - Rodrigues, Francisco A. T1 - Diagnosis of autism spectrum disorder based on functional brain networks and machine learning JF - Scientific Reports N2 - Autism is a multifaceted neurodevelopmental condition whose accurate diagnosis may be challenging because the associated symptoms and severity vary considerably. The wrong diagnosis can affect families and the educational system, raising the risk of depression, eating disorders, and self-harm. Recently, many works have proposed new methods for the diagnosis of autism based on machine learning and brain data. However, these works focus on only one pairwise statistical metric, ignoring the brain network organization. In this paper, we propose a method for the automatic diagnosis of autism based on functional brain imaging data recorded from 500 subjects, where 242 present autism spectrum disorder considering the regions of interest throughout Bootstrap Analysis of Stable Cluster map. Our method can distinguish the control group from autism spectrum disorder patients with high accuracy. Indeed the best performance provides an AUC near 1.0, which is higher than that found in the literature. We verify that the left ventral posterior cingulate cortex region is less connected to an area in the cerebellum of patients with this neurodevelopment disorder, which agrees with previous studies. The functional brain networks of autism spectrum disorder patients show more segregation, less distribution of information across the network, and less connectivity compared to the control cases. Our workflow provides medical interpretability and can be used on other fMRI and EEG data, including small data sets. KW - Maschinelles Lernen KW - Gehirn KW - Neuronales Netz KW - Autismus Y1 - 2023 UR - https://rdcu.be/dcwIP U6 - https://doi.org/https://doi.org/10.1038/s41598-023-34650-6 VL - 2023 IS - 13/8072 SP - 1 EP - 20 ER - TY - CHAP A1 - Rötzel, Peter A1 - Schulze, Mike ED - Gleich, Ronald T1 - Results from the Green Controlling-Study 2022 T2 - IGC-General Assembly KW - Nachhaltigkeitscontrolling KW - Green Controlling KW - Controllerstudie KW - Sustainability KW - Survey KW - Nachhaltigkeit KW - Controlling Y1 - 2023 VL - 2023 ER - TY - CHAP A1 - Rötzel, Peter A1 - Bustorff, Naomi A1 - Kokott, Peter T1 - Analysis of the Impact of Recommendations from Intelligent Expert Systems on Personal Trust and Decision-Making Performance KW - Artificial Intelligence KW - Trust KW - Intelligent Expert Systems KW - Künstliche Intelligenz KW - Vertrauen Y1 - 2023 ER - TY - JOUR A1 - Thielemann, Christiane A1 - Krstić, Nenad A1 - Jüttner, Jens A1 - Giegerich, Lars A1 - Mayer, Margot A1 - Knuth, Monika A1 - Müller, Achim T1 - 3D printed biosensor for continuous glucose measurement in cell cultures JF - Annals of 3D Printed Medicine N2 - A novel 3D-printed glucose sensor is presented for cell culture application. Glucose sensing was performed using a fluorescence resonance energy transfer (FRET)-based assay principle based on ConA and dextran. Both molecules are encapsulated in alginate microspheres and embedded in the UV-curable, stable hydrogel polyvinyl alcohol (PVA). The rheology of the formulation was adapted to obtain good properties for an extrusion-based printing process. The printed sensor structures were tested for their ability to detect glucose in vitro. A proportional increase in fluorescence intensity was observed in a concentration range of 0 - 2 g/L glucose. Tests with HEK cell cultures also showed good cell compatibility and excellent adhesion properties on plasma-treated Petri dishes. The printed sensors were able to detect the glucose decay associated with the metabolic activities of the fast-growing HEK cells in the cell culture medium over ten days. The proof-of-principle study shows that metabolic processes in cell cultures can be monitored with the new printed sensor using a standard fluorescence wide-field microscope. KW - Bioprinting, FRET, Enzyme-free glucose sensor, PVA hydrogel KW - Biosensor KW - 3D-Druck KW - Zellkultur Y1 - 2023 U6 - https://doi.org/https://doi.org/10.1016/j.stlm.2023.100111 VL - 2023 IS - - SP - - EP - - ER - TY - CHAP A1 - Kefer, Stefan A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - POLYMER PLANAR BRAGG GRATINGS BASED ON BULK CYCLIC OLEFIN COPOLYMERS: FABRICATION AND FUNCTIONALIZATION T2 - Proceedings of Student Conference on Sensors, Systems and Measurement 2021 KW - Bragg-Reflektor Y1 - 2021 UR - https://scssm.fel.cvut.cz/wp-content/uploads/2021/07/Proceedings-SCSSM-2021.pdf SN - 978-80-01-06822-9 ER - TY - CHAP A1 - Kefer, Stefan A1 - Pape, Natalie A1 - Gries, Nikola A1 - Roth, Gian-Luca A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Towards Pressure Sensors Based on Polymer Planar Bragg Gratings T2 - Organic Photonic Materials and Devices XXV N2 - While Bragg grating-based optical devices have shown promising performances for pressure sensing applications, their sensitivity, especially in the low-pressure regime, is unsatisfying and needs to be optimized by elaborate designs, such as cantilevers or other extrinsic mechanical transducers. This contribution demonstrates and discusses a novel concept for optical pressure sensors based on polymer planar Bragg gratings. Waveguide and Bragg grating are fabricated underneath the surface of a temperature-stable and humidity-insensitive cyclic olefin copolymer substrate by means of a femtosecond laser. Based on the employed direct-writing procedure, in combination with adaptive, in-situ beam shaping with a spatial light modulator, writing depth, i.e., location of the photonic structures within the substrate, as well as Bragg grating periodicity and positioning can be deliberately chosen. Afterwards, the polymer substrate is post-processed with a high-precision micro mill, so a diaphragm comprising the integrated photonic structures is generated. The resulting diaphragm exhibits a thickness of 300 µm and a diameter of 10 mm. Finally, the optical sensor is packaged and sealed to form an air-filled gas pocket underneath the diaphragm. Deformations of the diaphragm by external pressure changes translate to strain variations along the waveguide axis and thus perturb the Bragg grating period. This leads to changes in the grating’s wavelength of main reflection, which can be evaluated in order to quantify the relative external pressure. With this straightforward optical sensor concept, pressure sensitivities up to 39 pm kPa-1, within relative pressures ranges from 78 kPa to 372 kPa, are achieved. KW - Bragg grating KW - pressure sensor KW - integrated photonics KW - cyclic olefin copolymers KW - femtosecond laser KW - Bragg-Reflektor KW - Drucksensor Y1 - 2023 SN - 9781510659414 U6 - https://doi.org/10.1117/12.2648723 ER - TY - CHAP A1 - Kefer, Stefan A1 - Zettl, Julian A1 - Schmauss, Bernhard A1 - Esen, Cemal A1 - Hellmann, Ralf ED - Kling, Rainer ED - Pfleging, Wilhelm ED - Watanabe, Akira T1 - High-Precision Micromachining of Sapphire Towards Optical Waveguiding Structures using Femtosecond Lasers T2 - Laser-based Micro- and Nanoprocessing XVII N2 - While sapphire is one of the most durable materials, its properties entail that high-precision machining, especially in the sub-millimeter regime, is still challenging. This contribution demonstrates and discusses novel femtosecond laser-based micromachining approaches for the fabrication of rotational-symmetric sapphire workpieces, specifically the generation of optical fibers by means of laser lathe of sapphire rods and the practical realization of windmill fibers. In addition, volume refractive index modification in planar sapphire substrates is presented to induce photonic crystal waveguides. The micromachined structures are comprehensively examined with respect to geometric fidelity, surface roughness, refractive index modification, and potential optical waveguiding properties. All micromachining approaches are done by means of frequency-doubled or frequency-tripled femtosecond laser radiation. Different laser optical setups including laser scanning head, spatial beam profilers including a spatial light modulator and axial rotatory movement of the specimen are employed for micro structuring and in-depth refractive index modifications. In particular for laser lathe, a sophisticated scanning pattern, in combination with an incremental axial rotatory movement of the specimen, allows for the precise diameter reduction of sapphire rods with 250 µm diameter to fibers with outer diameters of 25 µm. By supporting the workpiece with a V-groove fixture, multi-mode fibers with lengths up to 20 cm can be processed with an average surface roughness of 250 nm. Additionally, an adapted ablation scanning sequence enables the first practical demonstration of sapphire windmill fibers. Furthermore, using a spatial light modulator allows for the adaption of the laser propagation properties as to enable volume refractive index modifications with free-form arrangement. Hexagonal patterns of refractive index modifications surrounding a pristine waveguide core are fabricated and single-mode waveguiding at 1550 nm is verified. Finally, the possibility of integrating Bragg gratings into this photonic waveguide type is demonstrated KW - sapphire KW - femtosecond laser KW - micromachining KW - laser lathe KW - rod-to-fiber KW - Femtosekundenlaser KW - Saphir Y1 - 2023 SN - 9781510659230 U6 - https://doi.org/10.1117/12.2648758 SP - 3 EP - 11 ER - TY - JOUR A1 - Kefer, Stefan A1 - Zettl, Julian A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Femtosecond Laser-Based Micromachining of Rotational-Symmetric Sapphire Workpieces JF - Materials N2 - Sapphire is a robust and wear-resistant material. However, efficient and high-quality micromachining is still a challenge. This contribution demonstrates and discusses two novels, previously unreported approaches for femtosecond laser-based micromachining of rotational-symmetric sapphire workpieces, whereas both methods are in principal hybrids of laser scanning and laser turning or laser lathe. The first process, a combination of a sequential linear hatch pattern in parallel to the workpiece’s main axis with a defined incremental workpiece rotation, enables the fabrication of sapphire fibers with diameters of 50 µm over a length of 4.5 mm. Furthermore, sapphire specimens with a diameter of 25 µm over a length of 2 mm can be fabricated whereas an arithmetical mean height, i.e., Sa parameter, of 281 nm is achieved. The second process combines a constant workpiece feed and orthogonal scanning with incremental workpiece rotation. With this approach, workpiece length limitations of the first process are overcome and sapphire fibers with an average diameter of 90 µm over a length of 20 cm are manufactured. Again, the sapphire specimen exhibits a comparable surface roughness with an average Sa value of 249 nm over 20 cm. Based on the obtained results, the proposed manufacturing method paves an innovative and flexible, all laser-based way towards the fabrication or microstructuring of sapphire optical devices, and thus, a promising alternative to chemical processes. KW - sapphire KW - femtosecond laser KW - micromachining KW - laser turning KW - ablation threshold KW - Femtosekundenlaser KW - Saphir Y1 - 2022 UR - https://www.mdpi.com/1996-1944/15/18/6233 U6 - https://doi.org/10.3390/ ma15186233 VL - 15 IS - 18 SP - 6233 EP - 6233 ER - TY - CHAP A1 - Weber, Maximilian A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - Resilience-Oriented Management Control Systems as a Translation Mechanism of Resilience Strategy into Managerial Action—A Systematic Review T2 - 45th Annual Congress of the European Accounting Association KW - Management KW - Kontrollsystem KW - Resilienz Y1 - 2023 VL - 2023 IS - 45 SP - 1 EP - 43 ER - TY - CHAP A1 - Kokott, Peter A1 - Weber, Maximilian A1 - Rötzel, Peter T1 - Managerial Attention in Times of Crisis - A Decisive Factor for Organizational Resilience T2 - 45th Annual Congress of the European Accounting Association KW - Führungskraft KW - Krise Y1 - 2023 VL - 2023 IS - 45 ER - TY - CHAP A1 - Rötzel, Peter T1 - How Information Overload in Project Management Reporting Drives Escalation of Commitment - A Lab Experiment T2 - 45th Annual Congress of the European Accounting Association KW - Information Overload KW - Informationsüberlastung KW - Projektmanagement Y1 - 2023 VL - 2023 IS - 45 ER - TY - THES A1 - Ciba, Manuel T1 - Synchrony Measurement and Connectivity Estimation of Parallel Spike Trains from in vitro Neuronal Networks KW - Neuronales Netz Y1 - 2021 U6 - https://doi.org/https://doi.org/10.25972/OPUS-22364 ER - TY - JOUR A1 - Sauer, Timm A1 - Gorks, Manuel A1 - Spielmann, Luca A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Adaptive self-learning controllers with disturbance compensation for automatic track guidance of industrial trucks JF - SICE Journal of Control, Measurement and System Integration N2 - This paper presents an extended control concept for automatic track guidance of industrial trucks in intralogistic systems. It is based on Reinforcement Learning (RL), a method of Artificial Intelligence (AI). The presented approach is able to adapt itself to different industrial truck variants and to the associated specific vehicle parameters. In order to avoid starting the whole training of the controller for each truck variant from scratch, the training process is divided into two steps. In the first step, the controller is trained on a simplified linear model using parameters of a nominal vehicle variant. Based on this, the control parameters are only fine-tuned in the second step using a more complex nonlinear model, representing the real industrial truck. In this way, the controller is adapted to the actual truck variant and the corresponding parameter values. By using the nonlinear model, it can be ensured that the forklift’s dynamic is approximated within the entire operating range, even at high steering angles. Moreover, the influence of the disturbance variable of the system (path curvature) is compensated by considering this a priori knowledge within the control design. Therefore, the Artificial Neural Networks (ANN) of the RL controller and the observation vector are suitably adjusted. In this way, the occurring path curvatures can be considered in both training steps and the control parameters can be optimized accordingly. Thus, the influence of the disturbance variable can be compensated, which significantly improves the control quality. In order to demonstrate this, the new approach is compared to an RL control concept, which is not considering the disturbance variable and to a classical two-degrees-of-freedom (2DoF) control approach. KW - Flurförderer KW - Spurführung KW - Künstliche Intelligenz Y1 - 2023 U6 - https://doi.org/10.1080/18824889.2023.2183009 VL - 2023 IS - Vol. 16, No. 1 SP - 84 EP - 97 ER - TY - JOUR A1 - Sauer, Timm A1 - Gorks, Manuel A1 - Spielmann, Luca A1 - Zindler, Klaus T1 - Automatische Spurführung von Flurförderzeugen mittels KI JF - ATZ heavyduty N2 - Im Verbundprojekt KAnIS forscht die TH Aschaffenburg mit Linde Material Handling an neuen KI-basierten Algorithmen zur querdynamischen Fahrzeugführung von Flurförderzeugen. Ziel des Projekts ist die Entwicklung eines universell einsetzbaren Regelungskonzepts, das verschiedene Arten von Flurförderzeugen automatisch führt, im Betrieb auftretenden Fahrzeugparameterschwankungen gezielt Rechnung trägt und darüber hinaus auch den jeweiligen Fitnesszustand der Fahrzeuge berücksichtigt. KW - Flurförderer KW - Künstliche Intelligenz Y1 - 2022 VL - 15 IS - 04/2022 SP - 44 EP - 47 ER - TY - JOUR A1 - Zindler, Klaus A1 - Sauer, Timm A1 - Spielmann, Luca A1 - Gorks, Manuel T1 - Chancen durch kooperative Logistikflotten JF - Fördern und Heben N2 - In Zeiten einer globalen Weltwirtschaft und einem von zunehmendem Wettbewerb geprägten Markt ist die Automatisierung logistischer Prozesse eine Voraussetzung für den Unternehmenserfolg. Vor allem die Steigerung der Produktivität und der Effizienz des innerbetrieblichen Materialflusses nimmt einen hohen Stellenwert ein. Mit dem Einsatz automatisch fahrender Flurförderzeuge (FFZ) lässt sich dies erreichen. Als Vision sollten jedoch nicht einzelne automatisch fahrende FFZ gelten. Ziel muss es sein, die Mitglieder einer heterogenen Logistikflotte miteinander zu vernetzen und eine Kommunikations- und Rechenplattform einzurichten. Dies bietet ein großes Potenzial im Hinblick auf die Auftragsplanung zur Verbesserung der Wirtschaftlichkeit sowie in den Bereichen Lokalisierung und Sicherheit zur Optimierung automatisch fahrender FFZ. KW - Flurförderer KW - Autonomes Fahrzeug Y1 - 2022 VL - 2022 IS - 10 SP - 36 EP - 40 ER - TY - JOUR A1 - Alves, Caroline A1 - Cury, Rubens G. A1 - Roster, Kirstin A1 - Pineda, Aruane M. A1 - Rodrigues, Francisco A. A1 - Thielemann, Christiane A1 - Ciba, Manuel T1 - Application of machine learning and complex network measures to an EEG dataset from ayahuasca experiments JF - PLOS ONE N2 - Ayahuasca is a blend of Amazonian plants that has been used for traditional medicine by the inhabitants of this region for hundreds of years. Furthermore, this plant has been demon� strated to be a viable therapy for a variety of neurological and mental diseases. EEG experi� ments have found specific brain regions that changed significantly due to ayahuasca. Here, we used an EEG dataset to investigate the ability to automatically detect changes in brain activity using machine learning and complex networks. Machine learning was applied at three different levels of data abstraction: (A) the raw EEG time series, (B) the correlation of the EEG time series, and (C) the complex network measures calculated from (B). Further, at the abstraction level of (C), we developed new measures of complex networks relating to community detection. As a result, the machine learning method was able to automatically detect changes in brain activity, with case (B) showing the highest accuracy (92%), followed by (A) (88%) and (C) (83%), indicating that connectivity changes between brain regions are more important for the detection of ayahuasca. The most activated areas were the frontal and temporal lobe, which is consistent with the literature. F3 and PO4 were the most impor� tant brain connections, a significant new discovery for psychedelic literature. This connec� tion may point to a cognitive process akin to face recognition in individuals during ayahuasca-mediated visual hallucinations. Furthermore, closeness centrality and assorta� tivity were the most important complex network measures. These two measures are also associated with diseases such as Alzheimer’s disease, indicating a possible therapeutic mechanism. Moreover, the new measures were crucial to the predictive model and sug� gested larger brain communities associated with the use of ayahuasca. This suggests that the dissemination of information in functional brain networks is slower when this drug is present. Overall, our methodology was able to automatically detect changes in brain activity during ayahuasca consumption and interpret how these psychedelics alter brain networks, as well as provide insights into their mechanisms of action KW - Ayahuasca KW - Elektroencephalographie KW - Alzheimerkrankheit KW - Gehirn Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1371/journal. pone.0277257 VL - 2022 IS - 12 SP - 1 EP - 26 ER - TY - CHAP A1 - Weithmann, Sabrina T1 - Die Modernisierung des chinesischen Normungssystems T2 - Normungs- und Standardisierungsstrategien in China und Indien - Im Spannungsfeld von Industrie- und Geopolitik und Implikationen für Europa N2 - Das chinesische Normungssystem unterliegt seit Gründung der Volksrepublik 1949 einem kontinuierlichen Wandel. Mit der wirtschaftlichen Öffnung und wachsender Bedeutung am internationalen Handel wurde jedoch eine umfangreichere Modernisierung des chinesischen Normungssystems unausweichlich. Nachdem erste Versuche der Erneuerung des Normungssystems im Hauruckverfahren wenig Erfolg zeigten, geht China seit 2015 nun im Rahmen seiner Reformpläne für das Normungssystem einem ganzheitlicheren Ansatz nach. Einem Ansatz, der den Anforderungen und Ansprüchen einer führenden Wirtschaftsmacht in einem globalen Markt entspricht. Im Vergleich zu anderen führenden Normungsmächten wie Europa oder die USA gilt China als Nachzügler in der internationalen Normung. Das bietet jedoch den Vorteil, dass China aus den Erfahrungen anderer Nationen lernen und selbst ein Normungssystem etablieren kann, welches die besten Aspekte anderer Systeme aufgreift und gleichzeitig Chinas wirtschaftlichem Führungsanspruch gerecht wird. KW - Normung KW - Standardisierung KW - China KW - Normung KW - Standardisierung KW - China KW - Innovation KW - Standardization Y1 - 2022 UR - https://link.springer.com/content/pdf/10.1007/978-3-658-38204-9_8.pdf U6 - https://doi.org/https://doi.org/10.1007/978-3-658-38204-9_8 SP - 145 EP - 154 CY - Springer Gabler Wiesbaden ER - TY - GEN A1 - Stanik, Eva A1 - Döhring, Thorsten A1 - Schreiber, Kai A1 - Kätker, Anna A1 - Busch, Uwe T1 - X-ray honour gallery - award winners of the Röntgen Medal N2 - Starting in 1951, on the 50th anniversary of the award of the first Nobel Prize for physics to Wilhelm Conrad Röntgen, the Lord Mayor of the German city of Remscheid has annually awarded Röntgen Medals to scientists who "in the broadest sense have made a special contribution to the progress and dissemination of X-ray discoveries in the theoretical and applied sciences". The Röntgen Medal has become highly recognized in the scientific world. To date, more than one hundred scientists have received this honour. Through their chronology, this contribution presents a "Who’s Who" of X-ray science and provides selected insights into their scientific work; with special focus on the fields of X-ray optics and X-ray astronomy. N2 - Poster KW - X-ray KW - X-ray discoveries KW - X-ray optics KW - X-ray astronomy KW - Röntgen Medal KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Medaille KW - Röntgenstrahlung Y1 - 2022 ER - TY - GEN A1 - Schreiber, Kai A1 - Kätker, Anna A1 - Busch, Uwe A1 - Stanik, Eva A1 - Döhring, Thorsten T1 - Insights into the history of X-rays: the Deutsches Röntgen-Museum in Remscheid N2 - In 1895, Professor Wilhelm Conrad Röntgen detected a new kind of radiation that was able to penetrate solid materials, which he called x-rays. In 1901 Röntgen received the first Nobel Prize in physics in honour of this ground breaking discovery. The Deutsches Röntgen-Museum in Remscheid in Germany is the institution that uniquely and comprehensively explores and documents the life and work of W. C. Röntgen and the impact of his discovery. The museum’s location in Remscheid is not coincidental, with Röntgen’s birthplace only a short walk away from its exhibits. Every visit to the museum amounts to a unique expedition through the worlds of medicine, science, and technology. The museum’s emphasis on the diversity of Röntgen’s invention by a multilingual, multi-medial approach enables all visitors to make their own personal discoveries. The Deutsches Röntgen-Museum in Remscheid is a mustsee for x-ray scientists from anywhere in the world. This contribution provides an insight into the history of x-rays and offers a guided tour of the Deutsches Röntgen-Museum and its exhibits. N2 - Poster KW - X-ray history KW - Deutsches Röntgen-Museum KW - Wilhelm Conrad Röntgen KW - X-rays KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Röntgenstrahlung KW - Deutsches Röntgen-Museum Y1 - 2022 ER - TY - JOUR A1 - Flachs, Dennis A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Fabrication process for FEP piezoelectrets based on photolithographically structured thermoforming templates JF - Microsystem Technologies N2 - Piezoelectrets fabricated from fluoroethylenepropylene (FEP)-foils have shown drastic increase of their piezoelectric properties during the last decade. This led to the development of FEP-based energy harvesters, which are about to evolve into a technology with a power-generation-capacity of milliwatt per square-centimeter at their resonance frequency. Recent studies focus on piezoelectrets with solely negative charges, as they have a better charge stability and a better suitability for implementation in rising technologies, like the internet of things (IOT) or portable electronics. With these developments heading towards applications of piezoelectrets in the near future, there is an urgent need to also address the fabrication process in terms of scalability, reproducibility and miniaturization. In this study, we firstly present a comprehensive review of the literature for a deep insight into the research that has been done in the field of FEP-based piezoelectrets. For the first time, we propose the employment of microsystem-technology and present a process for the fabrication of thermoformed FEP piezoelectrets based on thermoforming SU-8 templates. Following this process, unipolar piezoelectrets were fabri� cated with air void dimensions in the range of 300–1000 lm in width and approx. 90 lm in height. For samples with a void size of 1000 lm, a d33-coefficient up to 26,508 pC/N has been achieved, depending on the applied seismic mass. Finally, the properties as energy harvester were characterized. At the best, an electrical power output of 0.51 mW was achieved for an acceleration of 1 � g with a seismic mass of 101 g. Such piezoelectrets with highly defined dimensions show good energy output in relation to volume, with high potential for widespread applications. KW - Mikrosystemtechnik Y1 - 2022 UR - Microsystem Technologies https://doi.org/10.1007/s00542-022-05405-6 U6 - https://doi.org/doi.org/10.1007/s00542-022-05405-6 VL - 2022 IS - November SP - 0 EP - 0 ER - TY - THES A1 - Kreß, Viktor T1 - Posenbasierte Intentionserkennung von ungeschützten Verkehrsteilnehmern aus einem Fahrzeug KW - Fahrerassistenzsystem KW - Fußgänger KW - Künstliche Intelligenz Y1 - 2022 ER - TY - JOUR A1 - Alves, Caroline A1 - Wissel, Lennart A1 - Capetian, Philipp A1 - Thielemann, Christiane T1 - Functional connectivity and convolutional neural networks for automatic classification of EEG data JF - Clinical Neurophysiology KW - Elektroencephalographie KW - Neuronales Netz Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1016/j.clinph.2022.01.086 VL - 2022 IS - 137 SP - e37 EP - e47 ER - TY - JOUR A1 - Bouillet, Thomas A1 - Ciba, Manuel A1 - Alves, Caroline A1 - Rodrigues, Francisco A. A1 - Thielemann, Christiane A1 - Colin, Morvane A1 - Buée, Luc A1 - Halliez, Sophie T1 - Revisiting the involvement of tau in complex neural network remodeling: analysis of the extracellular neuronal activity in organotypic brain slice co-cultures JF - Journal of Neural Engineering N2 - Objective: Tau ablation has a protective effect in epilepsy due to inhibition of the hyperexcitability/hypersynchrony. Protection may also occur in transgenic models of Alzheimer's disease by reducing the epileptic activity and normalizing the excitation/inhibition imbalance. However, it is difficult to determine the exact functions of tau, because tau knockout (tauKO) brain networks exhibit elusive phenotypes. In this study, we aimed to further explore the physiological role of tau using brain network remodeling. Approach: The effect of tau ablation was investigated in hippocampal-entorhinal slice co-cultures during network remodeling. We recorded the spontaneous extracellular neuronal activity over two weeks in single-slice cultures and co-cultures from control and tauKO mice. We compared the burst parameters and applied concepts and analytical tools intended for the analysis of the network synchrony and connectivity. Main results: Comparison of the control and tauKO co-cultures revealed that tau ablation had an anti-synchrony effect on the hippocampal-entorhinal two-slice networks at late stages of culture, in line with the literature. Differences were also found between the single-slice and co-culture conditions, which indicated that tau ablation had differential effects at the sub-network scale. For instance, tau ablation was found to have an anti-synchrony effect on the co-cultured hippocampal slices throughout the culture, possibly due to a reduction in the excitation/inhibition ratio. Conversely, tau ablation led to increased synchrony in the entorhinal slices at early stages of the co-culture, possibly due to homogenization of the connectivity distribution. Significance: The new methodology presented here proved useful for investigating the role of tau in the remodeling of complex brain-derived neural networks. The results confirm previous findings and hypotheses concerning the effects of tau ablation on neural networks. Moreover, the results suggest, for the first time, that tau has multifaceted roles that vary in different brain sub-networks. KW - Neuronales Netz KW - Alzheimerkrankheit KW - Gehirn KW - Schnittpräparat Y1 - 2022 U6 - https://doi.org/DOI 10.1088/1741-2552/aca261 VL - 2022 IS - November SP - 1 EP - 2 ER - TY - JOUR A1 - Flachs, Dennis A1 - Etzel, Johannes A1 - Mayer, Margot A1 - Harbecke, Frederic A1 - Belle, Stefan A1 - Rickmeyer, Tim A1 - Thielemann, Christiane T1 - Characterization of electrically conductive, printable ink based on alginate hydrogel and graphene nanoplatelets JF - Biomedical Engineering Advances N2 - In recent years, there has been an increasing interest in electrically conductive hydrogels for a wide range of biomedical applications, like tissue engineering or biosensors. In this study, we present a cost-effective conductive hydrogel based on alginate and graphene nanoplatelets for extrusion-based bioprinters. The hydrogel is prepared under ambient conditions avoiding high temperatures detrimental for cell culture environments. Investigation of the hydrogel revealed a conductivity of up to 7.5 S/cm, depending on the ratio of platelets. Furthermore, in vitro tests with human embyronic kidney cells - as an example cell type - showed good adhesion of the cells to the surface of the conductive hydrogel. Electrochemical measurements revealed a low electrode impedance which is desirable for the extracellular recording, but also low electrode capacitance, which is unfavorable for electrical stimulation purposes. Therefore, future experiments with the graphene nanoplatelets-based hydrogels will focus on electrodes for biosensors and extracellular recordings of neurons or cardiac myocytes. KW - Hydrogel KW - Biosensor KW - Alginate Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1016/j.bea.2022.100045 VL - 2022 IS - 4 SP - 1 EP - 2 ER - TY - JOUR A1 - Alves, Caroline A1 - Pineda, Aruane M. A1 - Roster, Kirstin A1 - Thielemann, Christiane A1 - Rodrigues, Francisco A. T1 - EEG functional connectivity and deep learning for automatic diagnosis of brain disorders: Alzheimer’s disease and schizophrenia JF - Journal of Physics: complexity N2 - Mental disorders are among the leading causes of disability worldwide. The first step in treating these conditions is to obtain an accurate diagnosis. Machine learning algorithms can provide a possible solution to this problem, as we describe in this work. We present a method for the automatic diagnosis of mental disorders based on the matrix of connections obtained from EEG time series and deep learning. We show that our approach can classify patients with Alzheimer’s disease and schizophrenia with a high level of accuracy. The comparison with the traditional cases, that use raw EEG time series, shows that our method provides the highest precision. Therefore, the application of deep neural networks on data from brain connections is a very promising method for the diagnosis of neurological disorders. KW - complex networks KW - Machine learning KW - Hirnfunktionsstörung KW - Alzheimerkrankheit KW - Schizophrenie KW - Elektroencephalographie Y1 - 2022 U6 - https://doi.org/DOI 10.1088/2632-072X/ac5f8d VL - 2022 IS - 3 SP - 1 EP - 13 ER - TY - JOUR A1 - Mayer, Margot A1 - Thielemann, Christiane A1 - Ciba, Manuel A1 - Lieb, Florian A1 - Ritter, Sylvia T1 - Electrophysiological investigation of human embryonic stem cell derived neurospheres using a novel spike detection algorithm JF - Biosensors and Bioelectronics KW - Microelectrode array KW - Microelectrode arrayNeurosphereSpHuman embryonic stem cell-derived neurons KW - Embryonale Stammzelle Y1 - 2018 U6 - https://doi.org/https://doi.org/10.1016/j.bios.2017.09.034 VL - 2018 IS - 100 SP - 462 EP - 468 ER - TY - CHAP A1 - Jost, Thomas ED - Piazolo, Marc ED - Jung, Mario ED - Harms, Inka T1 - Plädoyer für einen unabhängigen Europäischen Währungsfonds T2 - Wirtschaftspolitische Weichenstellung für die Zukunft KW - Europäischer Währungsfonds, ESM, Fiskalregeln, Staatsverschuldung KW - Europäische Union KW - Internationaler Währungsfonds Y1 - 2022 UR - file:///C:/Users/jost/Downloads/Tagungsband_Piazolo_Jung_Harms_07112022-1.pdf VL - 1 SP - 39 EP - 46 CY - Kaiserslautern ER - TY - CHAP A1 - Sauer, Timm A1 - Gorks, Manuel A1 - Spielmann, Luca A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Automatic track guidance of industrial trucks with time-variant vehicle parameters using AI-based controllers T2 - Advanes in Automotive Control - AAC N2 - This paper presents an extension of a self-learning control concept for automatic track guidance of industrial trucks in intralogistic systems. The presented approach is based on Reinforcement Learning (RL), a method of Artificial Intelligence (AI) and is able to adapt itself to different industrial truck variants and the associated specific vehicle parameters. Moreover, time-variant parameters during operation, such as the vehicle's velocity are taken into account. In order to consider the existing a priori knowledge of the controlled system and to avoid starting the whole training process of the controller for each truck variant from scratch, the training process is divided into two steps. In the first step, the controller is trained on a model using parameters of a nominal vehicle variant. Based on this, the control parameters are only finetuned in the second step. In this way the controller is adapted to the actual truck variant and the corresponding parameter values. In order to take into account the time-variant vehicle parameters during operation, the Artificial Neural Networks (ANN) of the RL controller and the observation vector are suitably extended. In this way, the varying speed can be considered in both training steps and the control parameters can be optimized accordingly. Thus, in case of the investigated scenarios a stable control loop behavior can be guaranteed for the entire speed range of industrial trucks. In order to demonstrate this, the new approach is compared with a RL control concept, not considering time-variant parameters. KW - Artificial Intelligence KW - Automatic control KW - Intelligent Transportation Systems KW - Künstliche Intelligenz KW - Flurförderer Y1 - 2022 VL - 2022 ER - TY - CHAP A1 - Sauer, Timm A1 - Spielmann, Luca A1 - Gorks, Manuel A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Automatic track guidance of industrial trucks using AI-based controllers with disturbance compensation T2 - 61st Annual Conference of the Society of Instrument and Control Engineers (SICE), 6-9 Sept. 2022, Japan N2 - This paper presents a new control concept for automatic track guidance of industrial trucks in intralogistic systems. It is based on Reinforcement Learning (RL), a method of Artificial Intelligence (AI). The presented approach is able to adapt itself to different industrial truck variants and to the associated specific vehicle parameters. In order to avoid starting the whole training of the controller for each truck variant from scratch, the training process is divided into two steps. In the first step, the controller is trained on a model using parameters of a nominal vehicle variant. Based on this, the control parameters are only fine-tuned in the second step. In this way the controller is adapted to the actual truck variant and the corresponding parameter values. Moreover, the influence of the disturbance variable of the system (path curvature) is compensated by considering this a priori knowledge within the control design. Therefore, the Artificial Neural Networks (ANN) of the RL controller and the observation vector are suitably adjusted. In this way, the occurring path curvatures can be considered in both training steps and the control parameters can be optimized accordingly. Thus, the influence of the disturbance variable can be compensated, which significanlty improves the control quality. In order to demonstrate this, the new approach is compared to a RL control concept, not considering the disturbance variable and to a classical two-degrees-of-freedom (2DoF) control approach. KW - Artificial Intelligence KW - Automatic Control KW - Intelligent Transportation Systems KW - Künstliche Intelligenz KW - Flurförderer Y1 - 2022 ER - TY - THES A1 - Zernetsch, Stefan T1 - Maschinelle Lernverfahren zur videobasierten Intentionserkennung von Radfahrern mit stationären Kameras KW - Maschinelles Lernen KW - Autonomes Fahrzeug KW - Fahrrad KW - Videoüberwachung Y1 - 2022 UR - https://kobra.uni-kassel.de/handle/123456789/13966 SN - 978-3-7376-1053-7 ER - TY - THES A1 - Belle, Stefan T1 - Herstellung und Charakterisierung von homogenen und inhomogenen Hohlwellenleitern zur Polarisationsänderung KW - Hohlleiter Y1 - 2022 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Hudec, Rene A1 - Sapsai, Iryna A1 - Friedrich, Peter A1 - Burwitz, Vadim T1 - Characterization of a lobster-eye type X-ray telescope T2 - EOSAM-Conference N2 - Lobster-eye type X-ray telescopes use reflecting plano mirrors under grazing incidence and can observe a large field of view. As part of a Bavarian-Czech cooperation, two telescopes were build, equipped with mirrors coated with gold and iridium. Their X-ray characterization was carried out at the PANTER test facility, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. The used X-ray mirrors reflect and focus visible light as well; their functionality in the optical regime was checked in laboratory tests. Now another test campaign will be carried out to examine the telescope resolution for real objects of the visible night sky and the imaging properties for star constellations. KW - Lobster-Eye KW - X-ray KW - telescope KW - iridium KW - mirror KW - Röntgenteleskop KW - Iridium KW - Röntgenspiegel Y1 - 2022 UR - https://www.europeanoptics.org/events/eos/eosam2022.html VL - 2022 SP - 1 EP - 1 ER - TY - CHAP A1 - Hudec, Rene A1 - Gille, Florian A1 - Guimbelot, Elzear A1 - Tichy, Vladimir A1 - Döhring, Thorsten T1 - Effective areas of astronomical X-ray optics for cubesats and rocket experiments T2 - DGaO Proceedings N2 - The effective area is one of the main telescope parameters when justifying real space application. We discuss the estimation of the effective collecting area of an X-ray telescope by two different methods, an analytical method and a simulation algorithm, and then compare the results. The Lobster Eye type telescopes considered here are designed for rocket experiments and CubeSat flights. KW - X-ray KW - telescope KW - satellite KW - effective area KW - Lobster Eye KW - Röntgenteleskop Y1 - 2022 UR - https://www.dgao-proceedings.de/download/123/123_p12.pdf SN - 1614-8436 VL - 2022 IS - 123 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Schmitt, Paul A1 - Szeghalmi, Andrea T1 - Umweltbeständige Spiegelbeschichtungen aus Iridium für den infraroten Spektralbereich T2 - DGaO Proceedings N2 - Das Edelmetall Iridium ist hart; extrem dicht; thermisch, mechanisch und chemisch stabil; weist eine hohe Reflektivität im mittleren und fernen Infrarot auf und hat eine hohe Beständigkeit gegenüber Umwelteinflüssen - auch ohne weitere Schutzschichten. Es wurden die komplexen Brechungsindizes für Iridium-Spiegelbeschichtungen bestimmt, welche vorhandene Literaturwerte ergänzen. KW - Iridium KW - Spiegel KW - Reflektivität KW - Brechungsindex KW - ALD KW - Iridium KW - Beschichtung Y1 - 2022 UR - https://www.dgao-proceedings.de/download/123/123_p13.pdf SN - 1614-8436 VL - 2022 IS - 123 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Rivolta, Giocomo A1 - Basso, Stefano A1 - Civitani, Marta A1 - Cotroneo, Vincenzo A1 - Döhring, Thorsten A1 - Michler, Willy-Leopold A1 - Pareschi, Giovanni A1 - Spiga, Daniele A1 - Stollenwerk, Manfred T1 - Upgrade of a laboratory X-ray diffractometer to extend its operating range towards soft energies T2 - Proceedings of SPIE N2 - The optical properties of X-ray mirror samples are commonly measured using diffractometers based on laboratory sources; like the Bede D1 diffractometer operating at INAF-OAB. This instrument can generate a collimated X-ray beam up to 60 keV, even though the most interesting energy region for x-ray astronomy applications is usually below 10 keV. In the softest part of this range (below 6 keV), high X-ray absorption in air hinders a full and precise characterization of optical components. In this work, we present an upgrade of the Bede D1 diffractometer that extends the operative range of the instrument below 6 keV; this is done by maximizing the flux at lowest energies and by reducing absorption by means of a helium-rich atmosphere. The upgraded instrument will be used for the tests of X-ray mirrors with innovative soft X-ray coatings, with potential application to the next generation X-ray telescopes (such as ATHENA and eXTP). KW - X-ray KW - mirror KW - reflectivity KW - refractometer KW - ATHENA KW - Röntgenspiegel KW - Diffraktometer Y1 - 2022 UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12181/121814S/Upgrade-of-a-laboratory-x-ray-diffractometer-to-extend-its/10.1117/12.2629940.short U6 - https://doi.org/doi: 10.1117/12.2629940 SN - 0277-786X VL - 2022 IS - 12181 SP - 121814S-1 EP - 121814s-7 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten A1 - Zeising, Sebastian A1 - Stieglitz, Veronika A1 - Burwitz, Vadim A1 - Rukdee, Surangkhana A1 - Friedrich, Peter A1 - Jelinek, Martin A1 - Hudec, Rene T1 - Röntgenteleskop-Funktionstests durch Beobachtung astronomischer Objekte am sichtbaren Nachthimmel T2 - DGaO Proceedings N2 - Lobster-Eye-Röntgenteleskope nutzen reflektierende Planspiegel unter streifendem Einfall und zeichnen sich durch ein großes Beobachtungsfeld aus. Die Spiegel reflektieren auch sichtbare Strahlung hervorragend. Nach Röntgen-messungen im Labor wurden nun weitere Tests durchgeführt, um die Abbildungs-eigenschaften mit realen Objekten des sichtbaren Himmels zu untersuchen. KW - Röntgenstrahlung KW - Teleskop KW - Lobster-Eye KW - Iridium KW - Astronomie KW - Röntgenteleskop KW - Spiegelteleskop Y1 - 2022 UR - https://www.dgao-proceedings.de/download/123/123_a35.pdf SN - 1614-8436 VL - 2022 SP - 1 EP - 2 PB - DGaO ER - TY - JOUR A1 - Sommer, David A1 - Pape, Dominik A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Tool Wear and Milling Characteristics for Hybrid Additive Manufacturing Combining Laser Powder Bed Fusion and In Situ High-Speed Milling JF - Ultra-Precision Manufacturing Technology for Difficult-to-Machine Materials N2 - We report on milling and tool wear characteristics of hybrid additive manufacturing comprising laser powder bed fusion and in situ high-speed milling, a particular process in which the cutter mills inside the powder bed without any cooling lubricant being applicable. Flank wear is found to be the dominant wear characteristic with its temporal evolution over utilization period revealing the typical s-shaped dependence. The flank wear land width is measured by microscopy and correlated to the achievable surface roughness of milled 3D-printed parts, showing that for flank wear levels up to 100 μm a superior surface roughness below 3 μm is accessible for hybrid additive manufacturing. Further, based on this correlation recommended tool, life scenarios can be deduced. In addition, by optimizing the finishing tool start position and the number of afore-built layers, the milling process is improved with respect to the maximum millable angle for undercut surfaces of 3D-printed parts to 30° for the roughing process and to 40° for the entire machining process including finishing KW - hybrid additive manufacturing; high-speed milling; laser powder bed fusion; tool wear KW - Hochgeschwindigkeitsfräsen KW - Werkzeugverschleiß Y1 - 2022 UR - https://www.mdpi.com/1996-1944/15/3/1236 U6 - https://doi.org/https://doi.org/10.3390/ma15031236 VL - 15 IS - 3 SP - 1 EP - 13 ER - TY - JOUR A1 - Kefer, Stefan T1 - Sapphire Photonic Crystal Waveguides with Integrated Bragg Grating Structure JF - Photonics N2 - Abstract: This contribution demonstrates photonic crystal waveguides generated within bulk planar sapphire substrates. A femtosecond laser is used to modify the refractive index in a hexagonal pattern around the pristine waveguide core. Near-field measurements reveal single-mode behavior at a wavelength of 1550 nm and the possibility to adapt the mode-field diameter. Based on farfield examinations, the effective refractive index contrast between the pristine waveguide core and depressed cladding is estimated to 3x10-4. Additionally, Bragg gratings are generated within the waveguide core. Due to the inherent birefringence of Al2O3, the gratings exhibit two distinct wavelengths of main reflection. Each reflection peak exhibits a narrow spectral full width at a half maximum of 130 pm and can be selectively addressed by exciting the birefringent waveguide with appropriately polarized light. Furthermore, a waveguide attenuation of 1 dB cm-1 is determined. KW - integrated photonics KW - sapphire KW - Bragg grating KW - femtosecond laser KW - photonic crystal waveguide KW - Wellenleiter KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2022 UR - https://www.mdpi.com/2304-6732/9/4/234 U6 - https://doi.org/https://doi.org/10.3390/photonics9040234 VL - 9 IS - 4 SP - 234 EP - 234 ER - TY - JOUR A1 - Sommer, David A1 - Götzendorfer, Babette A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Design Rules for Hybrid Additive Manufacturing Combining Selective Laser Melting and Micromilling JF - Design and Post Processing for Metal Additive Manufacturing N2 - We report on a comprehensive study to evaluate fundamental properties of a hybrid manufacturing approach, combining selective laser melting and high speed milling, and to characterize typical geometrical features and conclude on a catalogue of design rules. As for any additive manufacturing approach, the understanding of the machine properties and the process behaviour as well as such a selection guide is of upmost importance to foster the implementation of new machining concepts and support design engineers. Geometrical accuracy between digitally designed and physically realized parts made of maraging steel and dimensional limits are analyzed by stripe line projection. In particular, we identify design rules for numerous basic geometric elements like walls, cylinders, angles, inclinations, overhangs, notches, inner and outer radii of spheres, chamfers in build direction, and holes of different shape, respectively, as being manufactured by the hybrid approach and compare them to sole selective laser melting. While the cutting tool defines the manufacturability of, e.g., edges and corners, the milling itself improves the surface roughness to Ra < 2 µm. Thus, the given advantages of this hybrid process, e.g., space-resolved and custom-designed roughness and the superior geometrical accuracy are evaluated. Finally, we exemplify the potential of this particular promising hybrid approach by demonstrating an injection mold with a conformal cooling for a charge socket for an electro mobile KW - hybrid additive manufacturing; high-speed milling; selective laser melting; construction rules KW - Selektives Laserschmelzen KW - Hochgeschwindigkeitsfräsen Y1 - 2021 UR - https://www.mdpi.com/1996-1944/14/19/5753 U6 - https://doi.org/https://doi.org/10.3390/ma14195753 VL - 14 IS - 19 SP - 1 EP - 23 ER - TY - CHAP A1 - Krieg, Janina A1 - Carre, Antoine A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Hull, Tony A1 - Jedamzik, Ralf A1 - Westerhoff, Thomas T1 - The past decade of ZERODUR® glass-ceramics in space applications T2 - Proceedings of SPIE N2 - For the past four decades, ZERODUR® glass ceramics has flown on many satellites including the prominent space missions METEOSAT, Hubble Space Telescope, CHANDRA, and LISA pathfinder. Firstly, this unique material is chosen as mirror substrate for high precision optics due to its extreme thermal stability. Its near-zero thermal expansion over a wide temperature range of several tens of Kelvin is homogenous within the entire volume. This enables control of the ZERODUR®’s surface profile at the 10-picometer level. SCHOTT has conducted comprehensive material characteristics studies on the mechanical properties and the radiation environment effects experienced in realistic orbits to define the suitability of ZERODUR® to survive both high loads during launch and to support long-term missions, respectively. Besides these advantageous material properties, this glass-ceramics can be extremely light-weighted by precision grinding enabled by the new SCHOTT competence center for machining and metrology. In this paper, we will continue to trace the recent developments of ZERODUR® glass ceramics as space material in the context of selected missions flown since 2009 and those anticipated. Major milestones such as the LISA pathfinder mission are discussed. Furthermore, we outline the viable use of ZERODUR® for great observatory architectures for IR/O/UV spaceborne telescopes. The objective of this paper is to supplement an earlier review of the use of ZERODUR® for space applications in the past decade and to summarize the latest progress and results of material studies toward very efficient production capabilities for high-performance light-weighted mirror substrates. KW - mirror KW - space KW - glass ceramics KW - low thermal expansion KW - satellite KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1117/12.2628956 VL - 2022 IS - 12180 SP - 121805N-1 EP - 121805N-15 PB - SPIE ER - TY - JOUR A1 - Morawski, Jaroslaw T1 - Impact of working from home on European office rents and vacancy rates JF - Zeitschrift für Immobilienökonomie N2 - The massive shift to working from home during the Covid-19 pandemic triggered discussions about its potential impact on the future demand for office space and the risk it poses to the performance of office markets. Against this background, the goal of this paper is to investigate the link between working from home and the evolution of key indicators of office occupier markets across Europe over the past three decades. Based on the data from Eurostat and CBRE, the paper uses panel regression to investigate the temporal as well as cross-sectional relationships between the share of the workforce working from home and office rents and vacancy rates in major cities. The results are interesting in several ways. Firstly, changes in the share of employees working from home did not appear to have any significant impact on the evolution of rents or vacancy rates over time. However, occasional homeworking was significant in explaining cross-sectional differences in office market indicators. Moreover, contrary to the initial expectations, higher share of employees occasionally working from home appeared to be associated with stronger performance of the respective office market. As explanation, the paper proposes a hypothesis that this was due to working from home being only one aspect of broader changes in the office work environment and related socio-economic trends that had a net beneficial effect on office occupier markets. Although the results refer to historical developments and may not be fully applicable to the current context of the pandemic, they highlight the need to consider working from home in a broader perspective of office occupier trends and ways of working. KW - Office Markets, Working from Home, Covid-19 KW - Telearbeit KW - Geschäftsraummiete KW - Gewerbeimmobilien KW - COVID-19 Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1365/s41056-022-00057-z VL - 2022 IS - April SP - 1 EP - 16 ER - TY - BOOK A1 - Borgeest, Kai T1 - Manipulation von Abgaswerten N2 - Dieses Buch stellt Hintergründe zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuergeräte, Abgasrückführung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Prüfstand möglich sind, mit welchen Fahrzyklen getestet wird und in welchem rechtlichen und politischen Umfeld dies lange Zeit geschehen konnte. Es werden Maßnahmen vorgestellt, mit denen Fahrzeuge auch real Grenzwerte einhalten können und wie Manipulationen zukünftig rechtlich und politisch verhindert werden können. Dem Leser werden durch Literaturhinweise zusätzliche Details erschlossen. KW - Verbrennungsmotor KW - Kraftfahrzeugabgas KW - Motorsteuerung KW - Abgasskandal KW - Abschalteinrichtung KW - EDC Y1 - 2021 SN - 978-3-658-32810-8 VL - 2021 PB - Springer Vieweg CY - Wiesbaden ET - 2., überarbeitete und aktualisierte Auflage ER - TY - JOUR A1 - Jost, Thomas A1 - Tödter, Karl-Heinz T1 - Schuldenquoten in der Eurozone mit neuer Defizitregel abbauen JF - Ökonomenstimme KW - Fiskalregeln KW - Geldpolitik KW - Öffentliche Schulden KW - Europäische Union KW - Schuldenquote KW - Eurozone Y1 - 2022 VL - 2022 IS - 2022/10 SP - 1 EP - 2 ER - TY - RPRT A1 - Gubitz, Andrea A1 - Jost, Thomas A1 - Seitz, Franz A1 - Tödter, Karl-Heinz A1 - Ziebarth, Gerhard T1 - Das gescheiterte Großexperiment der EZB – und was jetzt? KW - Zinsänderung KW - Geldpolitik KW - EZB KW - Geldpolitik KW - geldpolitisches Instrument Y1 - 2022 UR - https://aktionskreis-stabiles-geld.de/wp-content/uploads/2022/07/Das-gescheiterte-Grossexperiment-der-EZB.pdf ER - TY - JOUR A1 - Jost, Thomas T1 - Direktinvestitionen JF - Das Wirtschaftsstudium KW - Direktinvestitionen KW - Direktinvestition Y1 - 2001 VL - 2001 IS - 2001/7 SP - 963 EP - 964 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Schmitt, Paul A1 - Szeghalmi, Adriana T1 - Environmentally stable iridium mirror coatings for the infrared spectral range T2 - Proceedings of SPIE N2 - Highly reflective metal coatings are essential for numerous optical elements. Established mirror coatings made of silver (Ag) and gold (Au) offer high and broadband self-reflection in the infrared (IR) spectral range but are susceptible to environmental influences and mechanical stress without suitable protective layers. In the long-wavelength spectral range, in particular, the absorption bands of these protective layers partially reduce the high mirror reflectivity again. However, the noble metal iridium (Ir) is hard, extremely dense, and thermally, mechanically, and chemically stable. Iridium provides a similarly high reflectivity in the mid (MIR) and far-infrared (FIR) spectral range, as silver and gold, and high resistance to environmental influences - even without protective layers. In this paper, the different deposition processes, as well as the optical and structural properties of iridium mirror coatings fabricated by atomic layer deposition (ALD) and by magnetron sputtering (MS), are presented and compared with each other. The complex refractive indices for ALD and MS deposited iridium mirror coatings were determined for wavelengths from 200 nm to 20 μm, complementing the existing literature values. We demonstrate that iridium mirror coatings offer a high and broadband reflectivity from the mid to far-infrared spectral range. In contrast to established – protected – silver and gold mirror coatings, the iridium coatings are environmentally durable and thermally stable up to 600 °C, even without protective layers. Therefore, as an interesting mirror coating material, iridium has the potential for special applications in infrared astronomy and probably also for industrial instruments. KW - iridium KW - coating KW - magnetron sputtering KW - atamic layer deposition KW - reflectivity KW - Iridium KW - Beschichtung Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1117/12.2632057 VL - 2022 IS - 12298 SP - 122980A-1 EP - 122980A-08 PB - SPIE ER - TY - RPRT A1 - Schork, Sabrina T1 - CO2-Bindung durch Hydrokulturpflanzen und Cyanobakterien - ein Vergleich im Büro Innenraum N2 - In dem vorliegenden Bericht wird die Veränderung der Innenraumluft durch den Einsatz einer Hydrokultur Pflanzenwand und einem Cyanobakterien Bild im Büroraum verglichen. KW - Nachhaltigkeit; Arbeitsraum; Produkttest; Innenraumluft; Mitarbeiter Produktvität; Innovation KW - Hydrokultur KW - Zimmerpflanzen KW - Raumluft KW - Cyanobakterien Y1 - 2022 ER - TY - GEN A1 - Hudec, Rene A1 - Gille, Florian A1 - Guimbelot, Elzear A1 - Tichy, Vladimir A1 - Döhring, Thorsten T1 - Effective areas of astronomical X-ray optics for cubesats and rocket experiments N2 - We address the problem of estimation the sensitivity of astronomical X-ray telescopes of Lobster Eye type , with emphasis on calculation of effective areas for telescopes designed for rocket and CubeSat flights. This parameter is one of the principal parameters when justifying the real space application. Indeed, the larger the effective area is, the more efficient the optical system is, able to provide images of fainter and more distant celestial targets. We discuss the estimation of the effective collecting area of a X-ray telescope by two different methods and then compare the results: the analytical method and then the simulation algorithm. N2 - Poster KW - CubeSat KW - rocket KW - X-ray KW - telescope KW - effective area KW - Röntgenteleskop Y1 - 2022 SP - 1 EP - 1 PB - DGaO ER - TY - GEN A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Schmitt, Paul A1 - Szeghalmi, Adriana T1 - Umweltbeständige Spiegelbeschichtungen aus Iridium für den infraroten Spektralbereich N2 - Hochreflektierende Metallbeschichtungen sind essenziell für zahlreiche optische Elemente. Bewährte Spiegelbeschichtungen aus Silber und Gold bieten eine hohe und breitbandige Eigenreflexion im infraroten Spektralbereich, sind ohne geeignete Schutzschichten jedoch anfällig gegenüber Umwelteinflüssen und mechanischer Beanspruchung. Insbesondere im langwelligen Spektralbereich verringern die Absorptionsbanden dieser Schutzschichten teilweise die hohe Spiegelreflektivität wieder. Das Edelmetall Iridium (Ir) ist hart; extrem dicht; thermisch, mechanisch und chemisch stabil; weist eine ähnlich hohe Reflektivität im mittleren und fernen Infrarot, wie Silber und Gold, auf und hat zusätzlich eine hohe Beständigkeit gegenüber Umwelteinflüssen - auch ohne Schutzschichten. In diesem Beitrag werden die optischen und strukturellen Eigenschaften von Iridium-Spiegelbeschichtungen, welche mittels Atomlagenabscheidung (ALD) und DC-Magnetron-Sputtern hergestellt wurden, vorgestellt und miteinander verglichen. Die komplexen Brechungsindizes für ALD-erzeugte und gesputterte Iridium-Spiegelbeschichtungen wurden für Wellenlängen von 200 nm bis 20 μm bestimmt, welche nun bereits vorhandene Literaturwerte ergänzen. N2 - Poster KW - Iridium KW - Brechungsindex KW - infrarot KW - Spiegel KW - Beschichtung KW - Iridium KW - Beschichtung Y1 - 2022 SP - 1 EP - 1 PB - DGaO ER - TY - JOUR A1 - Vogl, Markus A1 - Rötzel, Peter A1 - Homes, Stefan T1 - Forecasting performance of wavelet neural networks and other neural network topologies: A comparative study based on financial market data sets JF - Machine Learning with Applications N2 - In this study, we analyse the advantageous effects of neural networks in combination with wavelet functions on the performance of financial market predictions. We implement different approaches in multiple experiments and test their predictive abilities with different financial time series. We demonstrate experimentally that both wavelet neural networks and neural networks with data pre-processed by wavelets outperform classical network topologies. However, the precision of conducted forecasts implementing neural network algorithms still propose potential for further refinement and enhancement. Hence, we discuss our findings, comparisons with “buy-and-hold” strategies and ethical considerations critically and elaborate on future prospects. KW - Wavelet neural networks KW - Financial forecasting KW - Neural network topology KW - Intelligent systems KW - Finance KW - Wavelet KW - Neuronales Netz KW - Kreditmarkt Y1 - 2022 UR - https://www.sciencedirect.com/science/article/pii/S2666827022000287 U6 - https://doi.org/10.1016/j.mlwa.2022.100302 VL - 8 IS - 6 SP - 100302 EP - 100302 ER - TY - JOUR A1 - Weithmann, Sabrina A1 - Luedtke, Susann ED - Tichauer, Peter T1 - Erneuerung und Innovation statt Empörung: Ideen und Lösungen für Normung mit China JF - China Insights Wirtschaftsmagazin N2 - Normung galt lange als ein rein technisches Thema für ausgewiesene Spezialisten. Neuerdings erhält das Thema zusätzliche Aufmerksamkeit durch Vertreter aus industrie- und geopolitischen Fachkreisen, insbesondere aufgrund des Entwicklungsprojekts zur Seidenstraße. Die Autorinnen skizzieren den Erneuerungsbedarf für die Normungswelt und fordern mehr Innovation, um den wachsenden Herausforderungen in der internationalen Normung entgegen zu treten. KW - Normung KW - China KW - deviating technical standards KW - Seidenstrasse KW - Technische Innovation KW - Normung KW - China Y1 - 2022 UR - http://files.eyunhan.com/eweb_upload/assets/pdf/generic/web/viewer.html?file=pdf/1646878080418307e1253-54b1-4adb-8c3e-4d468c872da820220310100800418.pdf VL - 2022 IS - 01-2022 SP - 10 EP - 13 ER - TY - CHAP A1 - Büdel, Johannes A1 - Kuhlmann, Kai A1 - Herkommer, Christian A1 - Teigelkötter, Johannes T1 - Advanced Control Methods for High Performance Dual Two-Level Inverter for Traction Application T2 - Electromechanical Drive Systems 2021; ETG Symposium; 9-10 Nov. 2021 N2 - The topology of the dual two-level inverter in combination with an electrical machine with open-end winding is an optimal solution for the realization of high requirements from the automotive sector for high-performance traction drives. In this publication, methods for extending the operating range and improving output voltage and current quality are presented for synchronous as well as asynchronous PWM methods for the entire operating range for this system configuration. Emphasis is placed on symmetrical power sharing between the inverters to maximize the power range. Optimal integration of the system is achieved by the topology-related possibility of DC fast charging of the energy storages from a DC grid without an additional charging unit. KW - Wechselrichter KW - Elektrische Maschine KW - Elektroantrieb KW - Traktion, Kraftfahrzeugtechnik Y1 - 2021 SN - 978-3-8007-5685-8 ER - TY - CHAP A1 - Sauer, Timm A1 - Zindler, Klaus A1 - Gorks, Manuel A1 - Spielmann, Luca A1 - Jumar, Ulrich T1 - Automatic track guidance of industrial trucks using self-learning controllers considering a priori plant knowledge T2 - IEEE - 5th International Conference on Control Automation and Diagnosis (ICCAD'21), November 3-5, 2021, Grenoble, France N2 - This paper presents a new self-learning control scheme for lateral track guidance of industrial trucks using artificial intelligence. It is an universally applicable lateral dynamic control concept which is able to adapt itself to different truck variants. Moreover it shall consider vehicle parameter variations that occur during operation, such as the load dependent change of vehicle mass and moment of inertia. The proposed approach uses Reinforcement Learning. In order to reduce the training effort, a new concept is realized, taking into account a priori knowledge of vehicle behavior. Its fundamental idea consists of dividing the training process into two steps. In the first step the controller will be pre-trained on basis of a nominal model representing a priori knowledge of lateral dynamic vehicle behavior. Since this model is derived for an industrial truck with average vehicle parameter values, a fine tuning of the control parameters has to be performed in the second step. In this way the controller is adapted to the actual truck variant and the corresponding vehicle parameter values. In order to demonstrate the efficiency of the proposed control scheme, the simulation results given in this paper are compared to the closed loop behavior using standard LQR. KW - Labor für Simulation, Steuerung und Regelung KW - Kooperative Autonome Intralogistik Systeme KW - Flurförderer KW - Spurführung KW - Künstliche Intelligenz Y1 - 2021 ER - TY - JOUR A1 - Rung, Stefan A1 - Häcker, Niklas A1 - Hellmann, Ralf T1 - Thermal imaging of high power ultrashort pulse laser ablation of alumina towards temperature optimized micro machining strategies JF - IOP Conference Series: Materials Science and Engineering KW - Ultrakurzzeitlaser KW - Aluminiumoxide Y1 - 2021 UR - https://iopscience.iop.org/article/10.1088/1757-899X/1135/1/012027 U6 - https://doi.org/0.1088/1757-899X/1135/1/012027 VL - 1135 IS - 012027 SP - 1 EP - 9 ER - TY - JOUR A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Laser-Induced Period Surface Structures to Improve Solderability of Electrical Solder Pads JF - Applied Sciences KW - Laserstrahllöten Y1 - 2021 UR - https://www.mdpi.com/2076-3417/12/1/80/htm U6 - https://doi.org/10.3390/app12010080 VL - 2022 IS - 12/1 SP - 80 EP - 88 ER - TY - THES A1 - Schwarzer, Christian T1 - Kupfersintern als Fügetechnologie für Leistungselektronik KW - Leistungshalbleiter KW - Leistungselektronik KW - Sintern KW - Kupfer Y1 - 2022 ER - TY - JOUR A1 - Rötzel, Peter A1 - Pedell, Burkhard A1 - Groninger, Daniel T1 - Information load in escalation situations: combustive agent or counteractive measure? JF - Journal of Business Economics N2 - This experimental study analyzes how a key factor, information load, influences decision making in escalation situations, i.e., in situations in which decision mak- ers reinvest further resources in a losing course of action, even when accounting information indicates that the project is performing poorly and should be discontin- ued. This study synthesizes prior escalation research with information overload and investigates how different levels of information load influence the escalation of com- mitment. Our findings reveal a U-shaped effect of information load: When decision makers face negative feedback, a higher information load mitigates the escalation tendency up to a certain point. However, beyond this point, more information rein- forces the escalation tendency. Moreover, we find that the type of feedback affects self-justification, and we find a negative and significant interaction between informa- tion load and self-justification in negative-feedback cases. Thus, studies investigat- ing escalation of commitment should control for self-justification and information load when utilizing high levels of information load. Finally, in the positive-feedback condition, higher information load encourages decision makers to continue promis- ing courses of action, i.e., increases decision-making performance. KW - Informationsüberlastung Y1 - 2020 VL - 2020 IS - 90/4 SP - 757 EP - 786 ER - TY - RPRT A1 - Smeets, Mario A1 - Ostendorf, Ralf Jürgen A1 - Rötzel, Peter T1 - RPA for the financial industry N2 - Abstract: Like many service industries, the financial industry is largely characterized by administrative and back-office processes and distinguished by a broad systems landscape with a high proportion of legacy systems. Missing interfaces between information systems, user interfaces, or web applications often require many manual activities. As banks are often functionally organized into traditional departments, a process-oriented organizational structure is rarely in place. The financial industry therefore offers enormous potential for the use of robotic process automation (RPA) and the raising of potential benefits such as process-related cost savings, time reductions, and quality improvements. The aim of this chapter is to describe the tremendous opportunities that the use of RPA technology offers to the financial industry and to explain how these opportunities can be realized. Therefore, we start by explaining the challenges that progressive digitalization poses to the industry and how RPA, but also more advanced technologies (that work not only rule-based but also define own rules), such as artificial intelligence, can help to overcome them. As well as providing an overview of the various applications of RPA in the financial industry, we also provide a comprehensive case study of a relevant practical application KW - Robotic Process Automation KW - Finanzdienstleistung Y1 - 2021 ER - TY - JOUR A1 - Schmitt, Paul A1 - Felde, Nadja A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Uschmann, Ingo A1 - Hanemann, Kevin A1 - Siegler, Marie A1 - Klemm, Georg A1 - Gratzke, Nancy A1 - Tünnermann, Andreas A1 - Schwinde, Stefan A1 - Schröder, Sven A1 - Szeghalmi, Adriana T1 - Optical, structural, and functional properties of highly reflective and stable iridium mirrorcoatings for infrared applications: supplement JF - Optical Materials Express N2 - Metallic coatings are essential for numerous optical systems due to their high and broadband refl ectivity in the infrared spectral range. In contrast to well-established (protected)silver and gold mirror coatings, iridium is environmentally durable, referring to ISO 9211-3 and thermally stable up to 600 °C even without protective layers, as demonstrated. Additionally,the optical and related structural properties of atomic layer deposited (ALD) and magnetron sputtered (MS) Ir coatings were investigated using spectrophotometry, FTIR, ellipsometry, WLI, AFM, XRR, XRD, SEM, and electrical resistivity measurements. The properties of Ir ALD and Ir MS coatings diff er due to their topography and microstructure. KW - Iridium KW - mirror KW - ALD KW - Sputter KW - Iridium KW - Beschichtung Y1 - 2022 U6 - https://doi.org/10.6084/m9.figshare.17121509 VL - 2022 IS - 12/2 SP - 545 EP - 559 ER - TY - JOUR A1 - Schmitt, Paul A1 - Felde, Nadja A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Uschmann, Ingo A1 - Hanemann, Kevin A1 - Siegler, Marie A1 - Klemm, Georg A1 - Gratzke, Nancy A1 - Tünnermann, Andreas A1 - Schwinde, Stefan A1 - Schröder, Sven A1 - Szeghalmi, Adriana T1 - Optical, structural, and functional properties of highly reflective and stable iridium mirror coatings for infrared applications JF - Optical Materials Express N2 - Metallic coatings are essential for numerous optical systems due to their high and broadband refl ectivity in the infrared spectral range. In contrast to well-established (protected)silver and gold mirror coatings, iridium is environmentally durable, referring to ISO 9211-3 and thermally stable up to 600 °C even without protective layers, as demonstrated. Additionally,the optical and related structural properties of atomic layer deposited (ALD) and magnetron sputtered (MS) Ir coatings were investigated using spectrophotometry, FTIR, ellipsometry, WLI,AFM, XRR, XRD, SEM, and electrical resistivity measurements. The properties of Ir ALD and Ir MS coatings diff er due to their topography and microstructure. KW - Iridium KW - mirror KW - Sputter KW - ALD KW - Iridium KW - Beschichtung Y1 - 2022 U6 - https://doi.org/10.1364/OME.447306 VL - 2022 IS - 12 / 2 SP - 545 EP - 559 ER - TY - RPRT A1 - Jost, Thomas A1 - Tödter, Karl-Heinz T1 - Reducing sovereign debt levels in the post-Covid Eurozone with a simple deficit rule T2 - IMFS Working Paper Series KW - Eurozone KW - Öffentliche Schulden KW - Eurozone KW - Fiscal Rules KW - Maastricht Criteria KW - Stability and Growth Pact Y1 - 2021 UR - https://www.imfs-frankfurt.de/forschung/imfs-working-papers/details/publication/reducing-sovereign-debt-levels-in-the-post-covid-eurozone-with-a-simple-deficit-rule.html ER - TY - CHAP A1 - Probst, Anne-Catherine A1 - Hitzinger, Hans A1 - Bochtler, Ulrich A1 - Wölfel, Maximilian A1 - Schmitt, Christoph ED - U.R.S.I. Landesausschuss in Deutschland e.V. 2021, T1 - High Frequency Power Amplifier for Wideband Wireless Communication Systems T2 - Proceedings of the 2021 Kleinheubach Conference N2 - Increasing data transmission rates and bandwidth both belong to the challenges of the development of high-performance wireless communication systems. Multi-channel communication systems commonly use several narrowband power amplifiers each one for a single communication channel. Lossy couplers are needed both to separate the different channels from each other at the amplifiers input and to combine the amplified signals on each channel at the output. This approach depicts a poor efficiency and is limited to a few number of channels since each channel duplication involves 3 dB losses due to couplers. Alternatively, broadband radio frequency power amplifiers ensuring the simultaneous transmission of several carriers on a wide frequency range contribute to increase the cost and resource efficiency of transceivers in wireless communication systems. Gain flatness, a high output power, and low power levels of second and third order harmonics are required on the whole operating frequency range of the power amplifier in multi-carrier communication systems since overtones will degrade the quality of the communication. The present work investigates the performances of a broadband push-pull power amplifier based on LDMOS transistors, the input matching network using a 8:1 transmission line transformer. For the first time investigations on harmonic distortions of the amplified signal when using a transformer with 8:1 impedance transformation ratio are presented. Characterisation of the power amplifiers performances is focused on gain flatness, output power, harmonic distortions and efficiency at 110 W. KW - LDMOS KW - broadband RF power amplifier KW - push-pull KW - transmission line transformer KW - harmonic distortion KW - Hochfrequenzverstärker KW - Leistungsverstärker KW - Kommunikationssystem Y1 - 2021 U6 - https://doi.org/10.23919/IEEECONF54431.2021.9598443 VL - 2021 ER - TY - JOUR A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Chaoticity Versus Stochasticity in Financial Markets: Are Daily S&P 500 Return Dynamics Chaotic? JF - Communications in Nonlinear Science and Numerical Simulation N2 - In this study, we empirically show the dynamics of daily wavelet-filtered (denoised) S&P 500 returns (2000–2020) to consist of an almost equally divided combination of stochastic and deterministic chaos, rendering the series unpredictable after expiration of the Lyapunov time, resulting in futile forecasting attempts. We achieve a clear distinction of the true nature of the underlying time series dynamics by applying a novel and combinatory chaos analysis framework comparing the wavelet-filtered S&P 500 returns with respective surrogate datasets, Brownian motion returns and a Lorenz system realisation. Furthermore, we are the first to show the strange attractor of especially the daily-frequented S&P 500 return system graphically via Takens´ embedding and by spectral embedding in combination with Laplacian Eigenmaps. Finally, we critically discuss implications and future prospects in terms of financial forecasting. KW - nonlinear dynamics KW - chaos KW - recurrence analysis KW - finance KW - prediction KW - Aktienrendite KW - Kreditmarkt Y1 - 2022 VL - 2022 IS - Forthcoming SP - 1 EP - 51 ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - Enterprise Social Media and Control System Design T2 - Proceedings of 19th ACMAR - Annual Conference for Management Accounting Research N2 - Enterprise social media has been found to be a curse and a blessing at the same time. ESM has been reported to lead to unproductive ‘games of visibility’ and ‘exhibitionism’, while it has been also found to enable productive outcomes related to knowledge work and product innovation, the latter being the main reason for its wide-spread adoption. We argue that decisions to use ESM as a control instrument are not made in isolation, but as part of a set of complementary choices. We provide arguments and empirical evidence that the use of ESM as a control instrument in organizations complements the use of subjective evaluations of non-task related performance (SPE). We also show that firms that face high ESM employee concerns, have a stronger complementarity between ESM use and SPE. Additional analyses show that ESM use and performance-based pay (PBP) are also complements. Together the results imply that management control system configuration changes with the employment of ESM. KW - Mangement Control Systems KW - Controlling KW - Social Media KW - Mixed-Method Approach KW - Behavioral Accounting KW - Social Media KW - Unternehmen Y1 - 2022 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Rödling, Claudius A1 - Kimmel, Kevin A1 - Zeising, Sebastian A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Verma, Shruti A1 - Rees, Paul T1 - Optical characterization of reflective coatings for astronomical telescope mirrors T2 - DGaO Proceedings N2 - Aluminium evaporation is still the standard solution for reflective coatings of large astronomical mirrors. Silver and gold are also used in specific cases depending on the targeted wavelength. This study characterized different metallic coatings - including unusual ones like sputtered iridium - to identify the most suitable mirror coating for the spectral range from ultraviolet to infrared wavelengths. KW - Iridium KW - mirror KW - coating KW - reflectivity KW - telescope KW - Spiegelteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p4.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 1 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Cotroneo, Vincenzo A1 - Pareschi, Giovanni A1 - Gibertini, Eugenio A1 - Magagnin, Luca T1 - Low-density coatings for enhanced X-ray reflectivity of astronomical telescope mirrors T2 - DGaO Proceedings N2 - High reflectivity grazing incidence mirrors of astronomical X-ray telescopes are usually coated with thin layers of iridium, gold, or platinum. Due to a series of absorption edges, these noble metals have low reflectivity in the 2 - 4 keV band. We present the development of innovative material combinations using chromium and an additional layer of polydopamine for enhanced reflectivity X-ray coatings. KW - Dopamin KW - Iridium KW - mirror KW - coating KW - X-ray KW - Röntgenteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p3.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Rukdee, Surangkhana A1 - Friedrich, Peter A1 - Sahin, Fatih A1 - Hudec, Rene T1 - Charakterisierung von Weitwinkel-Röntgenteleskopen in der Testanlage PANTER T2 - DGaO Proceedings N2 - Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei Röntgenteleskope, bestückt mit Gold- und Iridium-beschichteten Planspiegeln. Deren Charakterisierung erfolgte an der Röntgentestanlage PANTER, welche parallel auf die Teleskope einfallendes Sternenlicht simuliert. Die Teleskope haben eine Winkelauflösung von ca. 4 Bogenminuten und eine Brennweite von rund 2 Metern. KW - Röntgenstrahlung KW - Teleskop KW - Iridium KW - Beschichtung KW - Astronomie KW - Röntgenteleskop KW - Iridium KW - Spiegelteleskop Y1 - 2021 UR - https://www.dgao-proceedings.de/download/122/122_p2.pdf SN - 1614-8436 VL - 2021 IS - 122 SP - 1 EP - 2 PB - DGaO ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Zuwendungsnießbrauch an GmbH-Anteilen: Gestaltungschancen und Risiken JF - Erbfolgebesteuerung N2 - Der unentgeltliche Zuwendungsnießbrauch an GmbH-Beteiligungen ist eine häufig genutzte Gestaltung, die auf die Versorgung von Angehörigen im Rahmen der vorweggenommenen Erbfolge abzielt. Aus wirtschaftlicher Sicht soll mit der Bestellung Nicht-Gesellschaftern eine regelmäßige Einkunftsquelle verschafft werden; daneben gilt es, bei den Beteiligten ertragsteuerliche, erbschaft- und schenkungsteuerliche Privilegien zu nutzen. Konkret geht es und die Ausschöpfung von Progressionsvorteilen und Freibeträgen. Grundsätzlich bleibt aber festzuhalten, dass die Bestellung eines Zuwendungsnießbrauchs an GmbH-Anteilen nach wie vor mit erheblichen rechtlichen und steuerlichen Unsicherheiten behaftet ist. KW - GmbH-Anteile; Zuwendungsnießbrauch; vorweggenommene Erbfolge; Zivilrecht; Ertragsteuerrecht; Schenkungsteuerrecht; KW - Nießbrauch KW - GmbH KW - Vorweggenommene Erbfolge KW - Steuerrecht Y1 - 2021 VL - 2021 IS - 12 SP - 313 EP - 318 ER - TY - JOUR A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Grilli, Francesco A1 - Benkel, Tara A1 - Hänisch, Jens A1 - Lao, Mayraluna A1 - Reis, Thomas A1 - Berberich, Eva A1 - Wolfstädter, Simon A1 - Schneider, Christian A1 - Miller, Paul A1 - Palmer, Chloe A1 - Glowacki, Bartek A1 - Climente-Alarcon, Vicente A1 - Smara, Anis A1 - Tomkow, Lukasz A1 - Jeunesse, Loic A1 - Staempflin, Martin A1 - Delautre, Guillaume A1 - Zimmermann, Baptiste A1 - van der Woude, Ruud A1 - Perez, Ana A1 - Samoilenkov, Sergey A1 - Molodyk, Alexander A1 - Pardo, Enric A1 - Kapolka, Milan A1 - Li, Shuo A1 - Dadhich, Anang T1 - Superconducting motors for aircraft propulsion: the Advanced Superconducting Motor Experimental Demonstrator project JF - Journal of Physics: Conference Series N2 - The European Union-funded Advanced Superconducting Motor Experimental Demonstrator (ASuMED) project started in May 2017 with the purpose of demonstrating the benefits of a new, fully superconducting motor for reaching the targets established by the Flightpath 2050 plan. The project aims at a motor power density of 20 kW kg−1 using a high-temperature superconducting (HTS) stator. The rotor will use HTS stacks operating like permanent magnets. A highly efficient cryostat for the motor combined with an integrated cryogenic cooling system and associated power converter will be used. This article provides a general overview of the prototype that is currently being assembled and that will be tested soon. KW - Hochtemperatursupraleiter KW - Flugtriebwerk Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1742-6596/1590/1/012051 U6 - https://doi.org/10.1088/1742-6596/1590/1/012051 VL - 1590 ER - TY - GEN A1 - Jost, Thomas ED - Main-Echo, T1 - Die Gefahr ultraexpansiver Geldpolitik KW - Geldpolitik KW - Europäische Zentralbank Y1 - 2021 ER - TY - CHAP A1 - Freudenmann, Dominic A1 - Stollenwerk, Manfred A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Negri, Michele A1 - Lauck, Felix T1 - Combustion efficiency of iridium coated pellets for environmentally friendly space propulsion T2 - 14th Pico- and Nanosatellite Workshop, Würzburg, Germany N2 - Most of the satellite engines still uses critical fuels such as hydrazine, which is chemically aggressive, toxic and carcinogenic. New developments for satellite engines try to avoid such critical propellants. One promising approach is the usage of rocket-grade hydrogen peroxide [H2O2] in mono- and bipropellant driven rocket engines. Catalysts in the rocket engines convert the hydrogen peroxide by an exothermic catalytic reaction; the resulting hot gases oxygen and water vapor provide the thrust. Currently used catalysts are, for example, Al2O3 pellets impregnated with platinum. Within a joint research project of Aschaffenburg University and the German Aerospace Center new catalysts are developed. They consist of ceramic pellets coated with iridium using the magnetron sputtering process. Thereby the surface structure of the iridium layers strongly depends on the used sputtering process conditions [1]. After optimization of the sputtering parameters, it was demonstrated in laboratory experiments that the catalytic effect (measured by the volume of released gas) can be increased by a factor of four compared to platinum impregnated pellets [2]. In first hot firing tests at the test bench complex M11 at the DLR- Institute of Space Propulsion, these new, iridium-based catalysts have been used in a model combustion chamber for hydrogen peroxide decomposition. For this purpose, the reaction chamber was filled with iridium pellets in the high-altitude simulation chamber of the M11.2 test bench. The model chamber was equipped with numerous measuring devices like temperature and pressure sensors (e.g. Tcat, pcat). With the help of the mass flow and the herein obtained data, performance characteristics of the propellant system were accessible. High-concentrated hydrogen peroxide was used in the experiments as monopropellant (~ 87-wt.% H2O2). During the experiments, the combustion chamber was operated in pulse mode and in continuous mode. Aim of this campaign called MoCa (“Monopropellant Catalytic Demonstrator”) is the demonstration of functionality and the performance evaluation of this iridium-based monopropellant system. Recent experimental results will be presented. References: [1] A. Büttner et al., Thin Solid Films 2018, 662: 41–46 [2] M. Stollenwerk et al., Journal of Materials Science 2021, 56(16), 9974-9984 KW - Satellitentechnik KW - Katalysator KW - Iridium Y1 - 2021 ER - TY - GEN A1 - Hudec, Rene A1 - Novakova, Hana A1 - Pritzl, Vaclav A1 - Vojnar, Jan A1 - Döhring, Thorsten T1 - CubeSat mission for the observation of meteoroid impacts on Moon T2 - DGaO Jahrestagung N2 - Recent progress in nanosatellite technologies allows to consider innovative new CubeSat missions for scientific purposes. We present and evaluate the design of a small and cost effective CubeSat mission to monitor lunar meteoroid impacts by detecting their optical flashes. The poster summarizes the results of a comprehensive survey of past and recent ground based and satellite based projects focussing on lunar impact monitoring and discusses important aspects of the proposed mission and various alternatives for their solutions. Several spacecraft orbits around Moon and their usefulness for lunar impact observation are studied. In addition, we discuss the environmental risks and challenges, which such spacecraft needs to face, mainly thermal management and radiation tolerance. Finally, we present and discuss the design an optical camera suitable to detect meteoroid impacts on the lunar surface. N2 - Poster KW - CubeSat KW - satellite KW - Moon KW - meteroid KW - impact KW - Impakt KW - Mond KW - Satellit Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Rödling, Claudius A1 - Kimmel, Kevin A1 - Zeising, Sebastian A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Verma, Shruti A1 - Rees, Paul T1 - Optical characterization of reflective coatings for astronomical telescope mirrors T2 - DGaO Jahrestagung N2 - With ground based optical telescopes astronomers observe celestial objects over a wide spectral range. As usually three or even more reflections at telescope mirrors are involved, good reflection properties of the mirror coatings are important. The aluminum evaporation technique has been - and is still - the standard solution for the reflective coatings of large astronomical mirrors. Such coatings have excellent reflectivity in the ultraviolet and in the visible, but perform poorly in the infrared. Silver is the metal having highest reflectivity for wavelengths longward of 400 nm, but isn´t the best choice for reflectivity in the ultraviolet and for blue light. To avoid degradation by oxidation, durable silver coatings need to be protected by transmitting overcoating layers. In the presented study, different metallic coatings – including unusual ones like sputtered iridium - are characterized to identify a coating that is most suitable for the spectral range from ultraviolet to infrared. Experimental results are compared to simulations based on the complex refractive indices of these materials. Thereby dependence of incidence angle and polarization is also considered. N2 - Poster KW - mirror KW - coating KW - iridium KW - astronomy KW - telescope KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stieglitz, Veronika A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Rukdee, Surangkhana A1 - Friedrich, Peter A1 - Sahin, Fatih A1 - HUdec, Rene T1 - Charakterisierung von Weitwinkel-Röntgenteleskopen in der Testanlage PANTER T2 - DGaO Jahrestagung N2 - Im Rahmen einer bayerisch-tschechischen Kooperation entstanden zwei mechanisch baugleiche Röntgenteleskope, bestückt mit Gold- und Iridium-beschichteten Planspiegeln. Die Charakterisierung der nach dem ägyptischen Gott HORUS benannten Teleskope erfolgte an der Röntgentestanlage PANTER des Max-Plack-Instituts für extraterrestrische Physik. Diese Vakuum-Testanlage simuliert parallel auf die Teleskope einfallendes Sternenlicht, wobei hier die Strahlung aus einer Röntgenquelle in 120 Metern Abstand stammt. Die Messungen selbst fanden in einer daran angebauten 12 Meter langen Testkammer von 3,5 Metern Durchmesser statt. Im März 2021 sahen die HORUS-Teleskope zum erstem Mal Röntgenlicht. Während der Testkampagne von ca. 54 Stunden Dauer wurden 536 Einzelmessungen an den beiden Teleskopen durchgeführt, bei denen Photonenenergien und Einfallswinkel variiert wurden. Von einer empfindlichen CCD-Kamera, einem Prototyp der eROSITA-Satellitenkamera, wurden hierbei insgesamt 11.153.574 Röntgenphotonen individuell detektiert, analysiert und digital verarbeitet. Die beiden Weitwinkel-Röntgenteleskope haben eine Winkelauflösung von circa 4 Bogenminuten und eine Brennweite von rund zwei Metern. N2 - Poster KW - Röntgenstrahlung KW - Spiegel KW - Teleskop KW - Satellit KW - Iridium KW - Röntgenstrahlung KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stadtmüller, Johannes A1 - Stollenwerk, Manfred A1 - Cotroneo, Vincenzo A1 - Pareschi, Giovanni A1 - Gibertini, Eugenio A1 - Magagnin, Luca T1 - Low-density coatings for enhanced X-ray reflectivity of astronomical telescope mirrors T2 - DGaO Jahrestagung N2 - X-ray telescopes usually operate in space and are quite different from astronomical telescopes for visible light. For normal angles of incidence, optical light is reflected on the mirror surface, whereas X-rays are either transmitted or absorbed. However, also high reflectivity X-rays mirrors are possible, when the incident rays direction is almost parallel to the mirror surface. Such grazing incidence mirrors are usually coated with thin layers of precious metals like iridium, gold or platinum, as this result in high X-ray reflectivity. These noble metals offer a wide range of reflection up to high photon energies, but, due to a series of absorption edges, have low reflectivity in the 2 - 4 keV band and below. This contribution presents the development of innovative material combinations based on thin layers of iridium and chromium, followed by an additional layer of carbon-based materials. We also discuss corresponding production methods (like dip coating) for enhanced reflectivity mirror coatings of future X-ray telescopes. N2 - Poster KW - X-ray KW - mirror KW - coating KW - iridium KW - satellite KW - Röntgenstrahlung KW - Spiegelteleskop Y1 - 2021 UR - https://dgao.de/jahrestagung/ VL - 2021 SP - 1 EP - 1 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Current results on laser-based production of complex optics in glass T2 - 10. Wetzlarer Herbsttagung "Moderne Optikfertigung", 29. - 30. September 2020, Wetzlar KW - Laserbearbeitung KW - Fertigungstechnik Y1 - 2020 ER - TY - GEN A1 - Schwarz, Simon A1 - Hellmann, Ralf T1 - Rapid laser fabrication of complex glass optics T2 - International Research Days N2 - Poster KW - Laserbearbeitung Y1 - 2021 ER - TY - JOUR A1 - Zettl, Julian A1 - Klar, Maximilian A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Laser turning with ultrashort laser pulses JF - Journal of Manufacturing Processes N2 - We report on a comprehensive micromachining study of rotationally symmetric parts using femtosecond laser. A laser turning process with tangential impingement of the laser radiation complemented by a trepanning optics is implemented as to accomplish a true laser lathe micromachining approach. With the objective of optimized ablation rate and reduced surface roughness, the influence of pulse energy, feed rate, trepanning diameter and angular beam incidence, respectively, is investigated for processing stellite rods. We find the smallest feasible feature sizes of 8.5 μm in diameter and smoothest surfaces with an arithmetic average of the roughness profile as low as 0.18 μm. The surface roughness, however, appears to be limited by the occurrence of laser induced periodic surface structures provoked by the femtosecond laser radiation. Furthermore, the variation of the fluence in accordance to the incidence on a curved surface is discussed and the heat input into the material is examined through a longitudinal cross section. KW - Ultrashort laser pulses KW - Turning KW - Ablation rate KW - Tangential processing KW - Trepanning optic KW - Ultrakurzer Lichtimpuls KW - Laserbearbeitung KW - Mikrobearbeitung KW - Femtosekundenlaser Y1 - 2021 U6 - https://doi.org/10.1016/j.jmapro.2021.06.025 VL - 2021 IS - 68 SP - 1562 EP - 1568 ER - TY - JOUR A1 - Zettl, Julian A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Tangential Laser Turning of Fused Silica Using Ultra-short Laser Pulses JF - Journal of Laser Micro/Nanoengineering N2 - Laser turning with ultra-short laser pulses provides the possibility of manufacturing rotationally symmetric geometries, even of hard to machine materials as fused silica, down to a micrometer scale. In this laser micro machining approach, the laser beam is oriented perpendicularly to the rotational axis and tangentially to the material, whereas the target geometry is realized by moving the constantly rotating specimen according to the specified geometry under the focused laser spot. Due to the fric-tion-less laser ablation it is possible to realize a turning process in fused silica without the use of a contacting tool and therefore without causing mechanical tensions in the work piece. The processing head focuses the laser to a calculated spot size of 18 μm in diameter and the applied processing gas pressure assists in removing the ablated material. In this study, femto-second laser turning of fused silica with a diameter of 3.7 mm is investigated. The influence of the applied pulse energy is stated and the use of a trepanning optic during the turning process is characterized. Furthermore, compre-hensive parameter studies in order to optimize roughness and to find the maximum achievable abla-tion rate are shown. Limited by the mechanical speed of the rotational axis, the highest feasible abla-tion rate is 19.5 mm³/min. A roughness of Ra 0.65 μm are demonstrated. KW - Ultra-short Laser Pulses KW - Laser Turning KW - Fused Silica KW - Ablation Rate KW - Process Efficiency KW - Laserbearbeitung KW - Mikrobearbeitung KW - Quarzglas KW - Ultrakurzer Lichtimpuls Y1 - 2021 U6 - https://doi.org/10.2961/jlmn.2021.01.2008 VL - 16 IS - 1 SP - 42 EP - 46 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Schleier, Max A1 - Hellmann, Ralf T1 - Laser Cut Interruption Detection from Small Images by Using Convolutional Neural Network JF - Sensors KW - laser cutting KW - remote sensing KW - convolutional neural network KW - cut interruption KW - image processing KW - Laserschneiden KW - Neuronales Netz Y1 - 2021 UR - https://doi.org/10.3390/s21020655 U6 - https://doi.org/10.3390/s21020655 VL - 2021 IS - 21(2) SP - 655 EP - 655 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Simultaneous Burr and Cut Interruption Detection during Laser Cutting with Neural Networks JF - Sensors KW - laser cutting KW - quality monitoring KW - artificial neural network KW - burr formation KW - cut interruption KW - Laserschneiden KW - Neuronales Netz Y1 - 2021 UR - https://doi.org/10.3390/s21175831 U6 - https://doi.org/10.3390/s21175831 VL - 2021 IS - 21 SP - 5831 EP - 5831 ER - TY - JOUR A1 - Schleier, Max A1 - Adelmann, Benedikt A1 - Esen, Cemal A1 - Glatzel, Uwe A1 - Hellmann, Ralf T1 - Development and evaluation of an image processing algorithm for monitoring fiber laser fusion cutting by a high-speed camera JF - Journal of Laser Applications KW - Laser cutting KW - Image processing KW - Optical imaging KW - Image sensors KW - Laser applications KW - Faserlaser KW - Laserschneiden KW - Bildverarbeitung Y1 - 2021 UR - https://doi.org/10.2351/7.0000391 U6 - https://doi.org/10.2351/7.0000391 VL - 2021 IS - 33 SP - 032004 EP - 032004 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - UKP-Prozess mit anschließendem CO2-Laserpolieren zur Fertigung komplexer Optiken T2 - 10. Workshop Laserbearbeitung von Glaswerkstoffen KW - Linse KW - Array KW - Laserbearbeitung KW - Ultrakurzzeitlaser KW - Kohlendioxidlaser Y1 - 2020 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Ultrashort pulsed laser backside ablation of fused silica JF - Optics Express KW - Femtosekundenlaser KW - Quarzglas KW - Mikrobearbeitung Y1 - 2021 VL - 29 IS - 15 SP - 23477 EP - 23486 ER - TY - JOUR A1 - Schwarz, Simon A1 - Götzendorfer, Babette A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Compact Beam Homogenizer Module with Laser-Fabricated Lens-Arrays JF - applied sciences KW - Femtosekundenlaser KW - Linse KW - Array Y1 - 2021 VL - 2021 IS - 11 SP - 1018 EP - 1018 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Enhanced ablation efficiency using GHz bursts in micromachining fused silica JF - Optics Letters KW - Fräsen KW - Mikrobearbeitung KW - Quarzglas KW - Femtosekundenlaser Y1 - 2021 VL - 46 IS - 2 SP - 282 EP - 285 ER - TY - JOUR A1 - Götzendorfer, Babette A1 - Kirchgässner, Hannah A1 - Hellmann, Ralf T1 - Tunable, Anisotropic Permeability and Spatial Flow of SLM Manufactured Structures JF - Materials KW - Permeabilität KW - Selektives Laserschmelzen Y1 - 2021 U6 - https://doi.org/doi.org/10.3390/ma14185205 VL - 2021 IS - 14 SP - 5205 EP - 5220 ER - TY - JOUR A1 - Götzendorfer, Babette A1 - Mohr, Thomas A1 - Hellmann, Ralf T1 - Hybrid Approaches for Selective Laser Sintering by Building on Dissimilar Materials JF - Materials KW - Laserstrahlsintern Y1 - 2020 U6 - https://doi.org/doi.org/10.3390/ma13225285 VL - 2020 IS - 13 (22) SP - 5285 EP - 5296 ER - TY - JOUR A1 - Büdel, Johannes A1 - Teigelkötter, Johannes ED - Schäfer, Heinz T1 - Doppelzweipunktwechselrichter für Elektrofahrzeuge - Systemeigenschaften und Steuerung JF - Elektrische Antriebstechnologie für Hybrid- und Elektrofahrzeuge N2 - Im vorliegenden Beitrag wird die Topologie des Doppelzweipunktwechselrichters für die Anwendung in Elektrofahrzeugen vorgestellt. Dazu werden zunächst der Schaltungsaufbau und die spezifischen Schaltungseigenschaften näher erläutert. Anschließend werden relevante Vorteile dieser Topologie für die Anwendung in Elektrofahrzeugen dargestellt. Für die Kombination unterschiedlicher Energiequellen mit Hilfe des Doppelzweipunktwechselrichters werden geeignete Steuerungsstrategien präsentiert und anhand von realen Messungen am Systemprüfstand verifiziert. Mit dem Vorgestellten Verfahren kann die Leistungsaufteilung auf die beiden Energiespeicher und deren Energieaustausch untereinander mit hohem Freiheitsgrad gesteuert werden. KW - Elektrofahrzeug KW - Wechselrichter Y1 - 2019 VL - 2019 IS - 149 SP - 114 EP - 127 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kuhlmann, Kai A1 - Lang, Klaus A1 - Ott, Patrick T1 - Testing of High-Power Traction Batteries T2 - SMSI 2021 - System of Units and Metreological Infrastructure N2 - Electric drives in road vehicles with a battery as energy storage are about to be introduced to the mass market. In order to guarantee the quality and operational safety of battery-powered vehicles, considerable efforts must be made by car manufacturers and their suppliers. Since the properties of the batteries significantly determine the performance of the vehicles, special test benches with precise measuring systems are required for the accurate determination of the battery properties. The safety devices of the traction batteries must also be tested on high-performance test benches. In this paper the necessary test benches and the corresponding measuring systems are presented. Estimations of the measurement uncertainty and possibilities to increase measurement accuracy are presented. KW - Traktionsbatterie KW - Elektrofahrzeug Y1 - 2021 UR - https://www.ama-science.org/proceedings/details/4061 SN - 978-3-9819376-4-0 U6 - https://doi.org/10.5162/SMSI2021/C7. SP - 294 EP - 295 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Herkommer, Christian A1 - Kuhlmann, Kai T1 - High Dynamic Power Balancing for Dual Two-Level Inverters during High-Speed Machine Operation T2 - 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) N2 - This paper aims to present optimized square-wave modulation strategies for the dual two-level inverter, fed by two separate and galvanically isolated energy sources, to balance and control the energy distribution of both inverter systems. Especially for high-speed operation, the methods keep the machine in the required state while decreasing the switching operations to a minimum. Method one aims to compensate voltage fluctuations of variable DC-link voltages, while the second method ensures a symmetrical power distribution for the two inverter systems. In addition, both methods offer the possibility of adapting the amplitude of the usually fixed fundamental load voltage during square-wave modulation. KW - Wechselrichter Y1 - 2020 UR - https://ieeexplore.ieee.org/document/9215695 SN - 978-1-7281-9807-1 U6 - https://doi.org/10.23919/EPE20ECCEEurope43536.2020.9215695 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander T1 - Optimized Dual Two-Level Inverter for Safe and Reliable Operation of Machines with Superconductive Stator Windings T2 - 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) N2 - This paper aims to present an optimized inverter topology, based on the dual two-level inverter, for feeding an open-end winding electrical machine with superconductive stator windings and a superconductive rotor. In order to achieve a high torque density, the stator windings are built of several superconducting tapes being in parallel. One inverter of the dual two-level inverter is equipped with powerful IGBT semiconductors and supplies the machine with energy. The second inverter is a low voltage MOSFET inverter that monitors the superconductor resistance (quench detection) and balances the current on the parallel superconductive tapes for guaranteeing an optimum operation with respect to the superconductive losses. KW - Elektrische Maschine KW - Wechselrichter Y1 - 2019 UR - https://ieeexplore.ieee.org/document/8915524 SN - 978-1-7281-2361-5 U6 - https://doi.org/10.23919/EPE.2019.8915524 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Staudt, Stefan A1 - Büdel, Johannes T1 - Highly Dynamic Calculation of Power Quantities and Further Analysis of Inverter-Fed Machines T2 - 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) N2 - In this contribution, a highly dynamic calculation method of power quantities and additional electrical quantities, such as RMS values and fundamental waveforms, is presented. Typically, these quantities are calculated periodically based on the fundamental cycle of the electrical voltages and currents. Hence, they are well defined during steady state conditions for ideal periodical waveforms. During dynamic balancing processes, electrical signals are non-periodic. In a strict sense, the fundamental cycle-based definitions, which are well known from the literature, are not valid for these transient signals. However, this paper presents a novel definition for the calculation of cycle-based quantities based on the switching cycle of the inverter output voltages. This definition delivers instantaneous results during transient balancing processes, whereby it approximates the conventional fundamental cycle-based definitions during the steady state. KW - Elektrische Maschine KW - Umrichter Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8515600 SN - 978-1-5386-4145-3 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Büdel, Johannes T1 - Highly Dynamic Switching Frequency-Based Calculation of Power Quantities, Fundamental Waveforms, and RMS Values of Inverter-fed Electrical Machines T2 - 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) N2 - This contribution presents an innovative approximation method for the estimation of power quantities, fundamental waveforms, and RMS values of inverter-fed electrical machines. Typically, all these parameters are calculated as cyclically linked to the fundamental cycle of the voltages and currents of the inverter output or machine input. In order to increase the dynamic of this calculation, a suitable evaluation method based on the inverter switching cycle has been presented in previous publications. The present paper extends this switching frequency-based analysis by introducing additional quantities such as apparent and reactive power. Moreover, the paper describes the utilization of this analysis method for a power control of a dual two-level inverter-fed application. KW - Elektrische Maschine KW - Umrichter Y1 - 2018 UR - https://ieeexplore.ieee.org/document/8507588 U6 - https://doi.org/10.23919/IPEC.2018.8507588 ER - TY - CHAP A1 - Büdel, Johannes A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Lang, Klaus T1 - Qualification and verification of high-power battery systems for traction application T2 - 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) N2 - This paper reveals that the standard test procedures for the qualification and verification of traction battery systems are not sufficient in certain cases. In fact, realistic and application-oriented tests on the interaction among the complex battery subsystems are inevitable. To achieve these objectives, a high-performance test bench with the unique selling features of a high voltage/- and current range, extremely low ripple currents, and high dynamics is presented. For the operation of the applied multiphase current-sharing inverter for charging/discharging the device under test (DUT), special control algorithms, especially a current balancing control method, is introduced. KW - Batteries KW - Traktionsbatterie Y1 - 2017 ER - TY - CHAP A1 - Staudt, Stefan A1 - Büdel, Johannes A1 - Kowalski, Thomas A1 - Lang, Klaus A1 - Teigelkötter, Johannes A1 - Stock, Alexander T1 - Optimized Modulation Schemes for the Efficiency Enhancement of Low Voltage Traction Drives T2 - 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) N2 - This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation schemes will be presented, as well as the transition between those schemes. Finally, the performance of the different schemes will be proved by dynamic and stationary tests through fully automatized measurement analysis. KW - Converter machine interactions KW - Electrical machine KW - Direct torque and flux control KW - Measurement KW - ulseWidth Modulation (PWM) KW - Elektrische Maschine KW - Niederspannung KW - Elektroantrieb Y1 - 2017 UR - https://ieeexplore.ieee.org/document/8098998 U6 - https://doi.org/10.23919/EPE17ECCEEurope.2017.8098998 ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Schreck, Steven A1 - Kress, Viktor A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Image Sequence Based Cyclist Action Recognition Using Multi-Stream 3D Convolution T2 - 2020 25th International Conference on Pattern Recognition (ICPR) N2 - In this article, we present an approach to detect basic movements of cyclists in real world traffic situations based on image sequences, optical flow (OF) sequences, and past positions using a multi-stream 3D convolutional neural network (3D-ConvNet) architecture. To resolve occlusions of cyclists by other traffic participants or road structures, we use a wide angle stereo camera system mounted at a heavily frequented public intersection. We created a large dataset consisting of 1,639 video sequences containing cyclists, recorded in real world traffic, resulting in over 1.1 million samples. Through modeling the cyclists' behavior by a state machine of basic cyclist movements, our approach takes every situation into account and is not limited to certain scenarios. We compare our method to an approach solely based on position sequences. Both methods are evaluated taking into account frame wise and scene wise classification results of basic movements, and detection times of basic movement transitions, where our approach outperforms the position based approach by producing more reliable detections with shorter detection times. Our code and parts of our dataset are made publicly available. KW - Fahrerassistenzsystem KW - Radfahrer Y1 - 2020 UR - https://ieeexplore.ieee.org/document/9413233 ER - TY - BOOK A1 - Preuß, Norbert A1 - Schöne, Lars Bernhard T1 - Real Estate und Facility Management aus Sicht der Consultingpraxis N2 - Die überarbeitete und deutlich erweiterte 4. Auflage dieses anerkannten Standardwerkes liefert einen umfassenden Einblick in die Grundsäulen des Real Estate und Facility Managements. Von der Projektentwicklung, dem Projektmanagement, über das Transaktions-, Portfolio- und Risikomanagement bis hin zum Asset-, Property- und Facility Management. Alle wesentlichen Leistungen sowie Argumente für ein nachhaltiges Management der Sachwertanlage Immobilie, die hierfür notwendigen Strategien, Methoden sowie Vorgehensweisen werden detailliert dargelegt. Besonders informativ, anregend und aufschlussreich wird der Leser durch den interdisziplinären Ansatz sowie die umfangreichen aktuellen Beispiele, Tabellen und Abbildungen durch den Lebenszyklus der Immobilie geführt. Dieses Werk wendet sich seit nunmehr über 15 Jahren an drei Zielgruppen: Studenten, die sich mit den Grundlagen und den vertiefenden Aspekten der Bau- und Immobilienwirtschaft insgesamt oder mit einzelnen Elementen, wie etwa einer Portfolio-Analyse oder der Due Diligence, gezielt auseinandersetzen wollen; an Praktiker, die die aktuellen Entwicklungen ihres Fachgebiets verfolgen und eine fortwährende Aktualisierung ihres Wissenstandes anstreben sowie Wissenschaftler, die durch die kritische Reflexion der hier beschriebenen Expertisen Impulse für die Weiterentwicklung ihres Forschungsgebietes erhalten können. KW - Facility-Management KW - Consulting Engineering Y1 - 2016 UR - https://link.springer.com/content/pdf/10.1007%2F978-3-662-48291-9.pdf SN - 978-3-662-48290-2 U6 - https://doi.org/10.1007/978-3-662-48291-9 PB - Springer Vieweg CY - Berlin ER - TY - BOOK A1 - Reisbeck, Tilman A1 - Schöne, Lars Bernhard T1 - Immobilien-Benchmarking: Ziele, Methoden, Nutzen und Praxis N2 - Dieses Werk zeigt Benchmarking als Analysemethode des Immobilien-Controllings besonders im Kontext der Renditeoptimierung und Kostensenkung. In der überarbeiteten 3. Auflage wird seine Anwendung in den Disziplinen Investment- und Portfoliomanagement sowie Asset-, Property- und Facility Management sowie die integrale Bedeutung innerhalb des Immobilienlebenszyklus beschrieben. Die erforderlichen Grundlagen, Methoden, Vorgehensweisen, als auch die einzelnen Bausteine des Benchmarkings werden detailliert und anhand einer Vielzahl von Praxisbeispielen erläutert. KW - Immobilienbewertung KW - Benchmarking Y1 - 2017 UR - https://link.springer.com/content/pdf/10.1007%2F978-3-662-55366-4.pdf SN - 978-3-662-55365-7 U6 - https://doi.org/https://doi.org/10.1007/978-3-662-55366-4 PB - Springer Vieweg CY - Berlin ER - TY - JOUR A1 - Söthje, Dominik A1 - Ischdonat, Nils A1 - Braune, Christian A1 - Setzer, Andreas A1 - Dreyer, Christian T1 - Zweites Leben für Flugzeugkabinen – Chemisches Recycling duromerbasierter faserverstärkter Kunststoffe JF - Kunststoffe KW - Faserverstärkter Kunststoff KW - Recycling KW - Flugzeugkabine Y1 - 2016 VL - 2016 IS - 9 SP - 205 EP - 208 ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Ran an die Fasern JF - K-Magazin KW - Faserverstärkter Kunststoff Y1 - 2019 VL - 2019 IS - 02 SP - 40 EP - 41 ER - TY - CHAP A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Low-Cost High-Performance Polymers for Aviation Applications T2 - Abstractbook: NanoCarbon Annual Conference 2019 KW - Polymere KW - Hochleistungswerkstoff KW - Luft- und Raumfahrtindustrie Y1 - 2019 VL - 2019 CY - Würzburg ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Neues Recyclingverfahren JF - Konstruktionspraxis KW - Recycling Y1 - 2019 VL - 2019 IS - 5 SP - 21 EP - 21 ER - TY - JOUR A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Recyceln von Faserverbundkunststoffen JF - Kunststoffxtra KW - Faserverstärkter Kunststoff KW - Recycling Y1 - 2019 VL - 2019 IS - 5 SP - 24 EP - 25 ER - TY - CHAP A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert T1 - Recycling of carbon fiber reinforced epoxy resins T2 - Abstractbook: NanoCarbon Annual Conference 2021 KW - Kohlenstofffaserverstärkter Kunststoff KW - Epoxidharz KW - Recycling Y1 - 2021 CY - Würzburg ER - TY - JOUR A1 - Söthje, Dominik A1 - Schamel, Elisabeth A1 - Schlachter, Herbert A1 - Wehnert, Gerd T1 - Chemical Recycling of Carbon Fiber Reinforced Epoxy Composites Using Mild Conditions JF - Chemie Ingenieur Technik KW - Epoxide KW - Recycling KW - Kohlenstofffaserverstärkter Kunststoff Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1002/cite.202100048 SN - 1522-2640 VL - 93 IS - 10 SP - 1 EP - 11 PB - Wiley-VCH GmbH CY - Weinheim ER - TY - RPRT A1 - Heinecke, Jana A1 - Schöne, Lars Bernhard T1 - Standortanalyse im deutschen Einzelhandel : empirische Untersuchung immobilienwirtschaftlicher Faktoren T2 - IIWM-Paper No. 3: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Der Fokus dieser Schrift liegt auf der Untersuchung der immobilienwirtschaftlichen Einflussfaktoren im Einzelhandel. Im Rahmen dieses Arbeitspapieres wurden 67 Einflussfaktoren identifiziert, zehn übergeordneten Faktorengruppen zugeteilt und in Form eines Standortfaktorenkataloges zusammengefasst. Unter der Zielsetzung die praktische Relevanz dieser Faktoren zu ermitteln, wurde in diesem Zusammenhang die Studie ‚Empirische Untersuchung der Standortfaktoren im Einzelhandel‘ mittels eines webbasierten Fragebogens durchgeführt. Da im Rahmen der Studie ebenfalls die Frage beantwortet werden sollte, ob und wie die Bedeutsamkeit der Faktoren je nach Einzelhandelsbranche variiert, wurden die Ergebnisse der Studie - getrennt nach dem Gesichtspunkt des Sortiments – für die Teilbranchen Food/Near-Food, nur Food und Non-Food des Einzelhandels ausgewertet. Dabei hat sich die Annahme, dass Unternehmen verschiedener Teilbranchen des Einzelhandels unterschiedliche Ansprüche an einen Standort stellen, im Rahmen der Studie bestätigt. Im Vergleich der Ergebnisse der einzelnen Branchen wird deutlich, dass die Standortfaktoren (von den einzelnen Branchen) grundsätzlich in einer anderen Reihenfolge priorisiert werden. Dies macht deutlich, dass auch innerhalb der Gesamtbranche des Einzelhandels spezifische Anforderungen und Bedürfnisse der verschiedenen Teilbranchen an einen Standort bestehen. KW - Einzelhandel KW - Standortplanung Y1 - 2018 UR - https://www.econstor.eu/bitstream/10419/190953/1/1043862668.pdf ER - TY - RPRT A1 - Schmitt, Timo A1 - Schöne, Lars Bernhard T1 - Staatliche Interventionen in Wohnimmobilienmärkten : Synopse internationaler Regulierungen T2 - IIWM-Paper No. 2: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Wirkung des in Deutschland eingeführten Mietrechtsnovellierungsgesetzes. Zentrales Ziel der Arbeit ist es, die bisher wahrnehmbaren Auswirkungen dieser Interventionsmaßnahme darzustellen und die Ergebnisse dieser ersten Untersuchung durch eine Gegenüberstellung mit staatlichen Maßnahmen im internationalen Raum zu festigen. Dabei wurden sowohl dem Mietrechtsnovellierungsgesetz ähnliche Regulierungen als auch anderweitige Maßnahmen untersucht, die von Staaten zur Dämpfung und Kontrolle der Mietpreise angewandt werden. Es wurde hauptsächlich auf statistische Daten sowie vorhandene Literatur und wissenschaftliche Analysen zurückgegriffen. Nach der Wirkungsanalyse der jeweiligen Maßnahmen wird im Fazit auf die Sinnhaftigkeit und Wirkung von staatlichen Interventionsmaßnahmen zur Mietpreisbegrenzung im Allgemeinen eingegangen. KW - Mietpreis KW - Mitrecht Y1 - 2018 UR - https://www.econstor.eu/bitstream/10419/175358/1/IIWM-Paper-No-2.pdf ER - TY - CHAP A1 - Franz, Daniel A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Superimposed beam deflection using acousto-optical deflectors in combination with a galvanometer scanner T2 - Lasers in Manufacturing - LiM 2021 KW - Galvanometer Y1 - 2021 ER - TY - CHAP A1 - Lutz, Christian A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Marx, Jan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Optical system for multi Bessel beam high power ultrashort pulsed laser processing using a spatial light modulator T2 - Lasers in Manufacturing - LiM 2021 N2 - We report on an optical setup for multi Bessel beam processing combining a refractive axicon and a spatial light modulator. Based on their particular beam profile, Bessel beams exhibit various advantages over conventional Gaussian beams for ultrashort pulsed laser processing. Especially for micromachining of transparent materials, applications such as micro-hole drilling or the generation of voids benefit from the increased focal length of the applied Bessel beam. In addition, on account of the significantly increased average output power of industrial ultrashort pulsed lasers over the last years, there is a high demand on multi spot applications for using the available laser power in efficient production processes. Our optical concept combines the dynamic possibilities of beam splitting using spatial light modulator with the benefits of Bessel beams facilitating multi Bessel beam processing. KW - Ultrakurzzeitlaser KW - Lichtmodulator Y1 - 2021 ER - TY - CHAP A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Chaoticity Versus Stochasticity in Financial Markets T2 - International Symposium on Forecasting KW - Chaos KW - Financial Market KW - S&P500 KW - Kapitalmarkt Y1 - 2021 VL - 2021 ER - TY - JOUR A1 - Kefer, Stefan A1 - Pape, Dominik A1 - Roth, Gian-Luca A1 - Hessler, Steffen A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Micromilling-assisted fabrication of monolithic polymer ridge-type waveguides with integrated photonic sensing structures JF - Optical Materials Express N2 - This study demonstrates and discusses a novel approach for the fabrication and rapid prototyping of monolithic photonic platforms comprising a ridge-type waveguide with integrated sensing structures. First, the bulk injection-molded cyclic olefin copolymer substrates are micromilled in order to define the physical extension of the ridge structure. Cross-sections down to 30 × 30 µm2, exhibiting a mean surface roughness of 300 nm, are achieved with this process. Subsequently, UV radiation is used to modify the ridge structure’s refractive index, which leads to the formation of an optical waveguide. By employing a phase mask, it is possible to equip the photonic platform with a Bragg grating suitable for temperature measurements with a sensitivity of −5.1 pm K-1. Furthermore, an integrated Fabry-Pérot cavity, generated during the micromilling step as well, enables refractive index measurements with sensitivities up to 1154 nm RIU-1. KW - Cyclic Olefin Copolymers KW - Micromilling KW - Bragg Grating KW - Fabry-Pérot Etalon KW - Bragg-Reflektor KW - Optischer Sensor Y1 - 2021 UR - https://www.osapublishing.org/ome/fulltext.cfm?uri=ome-11-8-2389&id=453071 U6 - https://doi.org/https://doi.org/10.1364/OME.425778 VL - 11 IS - 8 SP - 2389 EP - 2400 ER - TY - JOUR A1 - Kefer, Stefan A1 - Bischoff, Kay A1 - Roth, Gian-Luca A1 - Haubner, Julian A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Tunable Bulk Polymer Planar Bragg Gratings Electrified via Femtosecond Laser Reductive Sintering of CuO Nanoparticles JF - Advanced Optical Materials N2 - This contribution demonstrates and discusses electrically tunable polymer planar Bragg gratings based on bulk cyclic olefin copolymers. A lithographic single-writing-step method and femtosecond laser reductive sintering of copper(II) oxide nanoparticles are subsequently employed in order to generate buried photonic structures and copper conducting paths on top of the polymer substrate. This way, the necessary number of process steps for fabricating a planar polymer-based electro-optical device is greatly reduced. The response of a fully electrified grating structure follows temperature changes, induced by the copper conducting path, with sensitivities up to −31 pm K−1. Dilatometric measurements show that the specimen's behavior is correlated to the situationally reduced thermal expansion of the bulk polymer substrate. In consequence, the tuning response of the photonic platform follows a second order polynomial, whereas a direct current of 30 mA, which correlates to a power consumption of 18.3 mW, leads to a local temperature increase and a residual Bragg wavelength shift of 19.6 K and −547 pm, respectively. Moreover, the outstanding flexibility of the proposed fabrication concept is underlined by demonstrating alternative conducting path geometries, whereas one of the additional designs is adapted to control the spectral width of the Bragg grating's reflection peak. KW - Bragg gratings KW - CuO nanoparticles KW - cyclic olefin copolymers KW - electro-optic tuning KW - integrated photonics KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/10.1002/adom.202002203 U6 - https://doi.org/https://doi.org/10.1002/adom.202002203 VL - 9 IS - 13 SP - 2002203 EP - 2002203 ER - TY - GEN A1 - Kefer, Stefan A1 - Bischoff, Kay A1 - Roth, Gian-Luca A1 - Haubner, Julian A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Tunable Bulk Polymer Planar Bragg Gratings Electrified via Femtosecond Laser Reductive Sintering of CuO Nanoparticles (Advanced Optical Materials 13/2021) N2 - This cover image outlines the fabrication method of a polymer planar Bragg grating electrified via femtosecond laser reductive sintering of CuO nanoparticles (see article number 2002203 by Stefan Kefer and co-workers). Based on this sophisticated methodology, bulk cyclic olefin copolymer substrates can be equipped with integrated photonic structures comprising a waveguide as well as a Bragg grating. Its reflective characteristics can be efficiently tuned by means of the subsequently generated Cu conducting path, whereas the applied femtosecond laser process enables an almost limitless degree of freedom towards conducting path geometries. N2 - Cover zum zugehörigen Artikel KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2021 UR - https://onlinelibrary.wiley.com/doi/10.1002/adom.202170048 U6 - https://doi.org/https://doi.org/10.1002/adom.202170048 ER - TY - JOUR A1 - Herzog, Anna Laura A1 - Jouanne-Diedrich, Holger K. von A1 - Wanner, Christoph A1 - Weismann, Dirk A1 - Schlesinger, Tobias A1 - Meybohm, Patrick A1 - Stumpner, Jan ED - Serra, Raffaele T1 - COVID-19 and the kidney: A retrospective analysis of 37 critically ill patients using machine learning JF - Plos one N2 - Introduction There is evidence that SARS-CoV2 has a particular affinity for kidney tissue and is often associated with kidney failure. Methods We assessed whether proteinuria can be predictive of kidney failure, the development of chronic kidney disease, and mortality in 37 critically ill COVID-19 patients. We used machine learning (ML) methods as decision trees and cut-off points created by the OneR package to add new aspects, even in smaller cohorts. Results Among a total of 37 patients, 24 suffered higher-grade renal failure, 20 of whom required kidney replacement therapy. More than 40% of patients remained on hemodialysis after intensive care unit discharge or died (27%). Due to frequent anuria proteinuria measured in two-thirds of the patients, it was not predictive for the investigated endpoints; albuminuria was higher in patients with AKI 3, but the difference was not significant. ML found cut-off points of >31.4 kg/ m2 for BMI and >69 years for age, constructed decision trees with great accuracy, and identified highly predictive variables for outcome and remaining chronic kidney disease. Conclusions Different ML methods and their clinical application, especially decision trees, can provide valuable support for clinical decisions. Presence of proteinuria was not predictive of CKD or AKI and should be confirmed in a larger cohort. KW - COVID-19 KW - Maschinelles Lernen KW - Niereninsuffizienz Y1 - 2021 UR - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0251932 U6 - https://doi.org/https://doi.org/10.1371/journal.pone.0251932 VL - 2021 IS - Online/2021 SP - 1 EP - 15 ER - TY - JOUR A1 - Herzog, Anna Laura A1 - Busch, Jonas A1 - Wanner, Christoph A1 - Jouanne-Diedrich, Holger K. von ED - Iglesias-Osma, Maria Carmen T1 - Survey about do-it-yourself closed loop systems in the treatment of diabetes in Germany JF - Plos one N2 - Continuous glucose monitoring (CGM) improves treatment with lower blood glucose levels and less patient effort. In combination with continuous insulin application, glycemic control improves and hypoglycemic episodes should decrease. Direct feedback of CGM to continuous subcutaneous insulin application, using an algorithm is called a closed-loop (CL) artificial pancreas system. Commercial devices stop insulin application by predicting hypoglycemic blood glucose levels through direct interaction between the sensor and pump. The prediction is usually made for about 30 minutes and insulin delivery is restarted at the previous level if a rise in blood glucose is predicted within the next 30 minutes (hybrid closed loop system, HCL this is known as a predictive low glucose suspend system (PLGS)). In a fully CL system, sensor and pump communicate permanently with each other. Hybrid closedloop (HCL) systems, which require the user to estimate the meal size and provide a meal insulin basis, are commercially available in Germany at the moment. These systems result in fewer hyperglycemic and hypoglycemic episodes with improved glucose control. Open source initiatives have provided support by building do-it-yourself CL (DIYCL) devices for automated insulin application since 2014, and are used by a tech-savvy subgroup of patients. The first commercial hybrid CL system has been available in Germany since September 2019. We surveyed 1054 patients to determine which devices are currently used, which features would be in demand by potential users, and the benefits of DIYCL systems. 9.7% of these used a DIYCL system, while 50% would most likely trust these systems but more than 85% of the patients would use a commercial closed loop system, if available. The DIYCL users had a better glucose control regarding their time in range (TIR) and glycated hemoglobin (HbA1c). KW - Kontinuierliches Glucosemonitoring Y1 - 2020 UR - https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0243465 U6 - https://doi.org/https://doi.org/10.1371/journal. pone.0243465 VL - 2020 IS - Online/2020 SP - 1 EP - 17 ER - TY - RPRT A1 - Rock, Verena A1 - Schlesinger, Sarah A1 - Nolan, Sean A1 - Liebold, Philipp J. A1 - Zinn, Patrick T1 - PropTech Germany 2020 Studie T2 - PropTech Germany Studien N2 - Das Stichwort „PropTech” kursiert bereits seit einigen Jahren auf dem Immobilienmarkt und bildet den Überbegriff für Start-ups, die mit digitalen Technologien und innovativen Geschäftsmodellen die Digitalisierung in der Bau- und Immobilienbranche vorantreiben. Seit geraumer Zeit ist ein kontinuierlicher Anstieg der Anzahl von PropTech-Unternehmen im deutschen Markt zu verzeichnen. Entsprechend werden auch immer mehr technologische Einzellösungen angeboten, die oftmals allerdings nur einen Abschnitt eines Prozesses innerhalb des Immobilienlebenszyklus digitalisieren. Die daraus resultierende Kleinteiligkeit von PropTech-Unternehmen stößt in der immobilienwirtschaftlichen Fachöffentlichkeit auf Kritik, führt sie doch zu einer zunehmenden Intransparenz und Komplexitätssteigerungen innerhalb des Marktes. Die Mehrzahl der bisher veröffentlichten Studien richtet ihr Hauptaugenmerk dabei vor allem auf die Perspektiven und Einschätzungen der etablierten Immobilienwirtschaft hinsichtlich PropTech-Unternehmen und Digitalisierung. Demgegenüber werden die Ansichten und Auffassungen der PropTech-Unternehmen oftmals nicht hinreichend berücksichtigt. Es wurde noch nicht umfassend herausgearbeitet, wie PropTechs aktiv versuchen, im deutschen Immobilienmarkt die Digitalisierung weiter voranzutreiben und welchen Hürden sie hierbei begegnen. Diese Lücke beabsichtigt die vorliegende Studie zu füllen. Überdies bildet die Untersuchung eine Ausgangsbasis für anschließende Folgestudien, welche die Ergebnisse quantitativ verifizieren, um schlussendlich einen Abgleich mit der Perspektive der etablierten Immobilienunternehmen vorzunehmen. Diese Studie untersucht die Erfahrungen, Herausforderungen und Hürden von PropTech-Unternehmen beim Markteintritt in die deutsche Immobilienbranche. Basierend auf einem strukturierten Fragebogen wurden neun ausgewählte PropTech-Unternehmen aus unterschiedlichen Entwicklungsphasen zu folgenden Themenbereichen befragt: Stimmungsindikatoren: Markt- und Geschäftsentwicklung: Wie entwickelt sich die Auftragslage? • Von der Idee bis zum Business Model: Worauf kommt es an? • Hürden beim Markteintritt in die deutsche Immobilienwirtschaft: Welches sind die wesentlichen Hürden bei der Entwicklung des Geschäftsmodells, der Kundenakquise und der Etablierung des Produktes am Markt? • Kooperationen im PropTech-Markt: Wo liegt die Zukunft? KW - Immobilienwirtschaft KW - Digitalisierung Y1 - 2020 UR - https://www.iiwm.de/wp-content/uploads/2021/03/PropTech-Germany-2020-Studie.pdf ER - TY - RPRT A1 - Rock, Verena A1 - Brehm, Nadine A1 - Schlesinger, Sarah A1 - Liebold, Philipp J. T1 - PropTech Germany 2021 Studie T2 - PropTech Germany Studien N2 - PropTech-Charakteristika Die 185 teilnehmenden PropTechs sind den Reifegrad-Clustern Early Stager (19,5%), Grown Ups (57,8%) und Conquerer (22,7%) zuzuordnen. 48% der Prop-Techs sind sehr junge Unternehmen mit den Gründungsjahren 2018 - 2020. Durchschnittlich liegen 1,6 Jahre zwi-schen Gründung des Unternehmens und Launch des Produktes. Jeweils die Mehrheit der Teilnehmer bedient ausschließlich das B2B-Segment (80,0%), operiert mit weniger als 15 Mitarbeitern (65,4%) und befindet sich im Produkt-Entwicklungsstadium des laufenden Betriebs (70,8%). Die Spanne der von den PropTechs erzielten Umsätze ist weit. Korrespondierend mit dem “jungen” Unternehmensalter erzielten 29,7% der PropTechs nur bis zu 10.000€ Jahresumsatz in 2020. Jedoch geben an-dererseits 16,2% der Befragten einen Jahresumsatz von über 1 Mio. € an. Technologisch überwiegt die Plattformtechnologie in allen Lebenszyklusphasen. Als Einnahmenmodell existieren mehrheitlich Subscription- oder Lizenz-vereinbarungen, und eine laufende monatliche oder jährliche Gebühr wird meist als Preismodell genutzt. Schnittstellen verschiedenen Typs sind bereits bei 73,0% der PropTechs verfügbar. PropTechs im Immobilien-Lebenszyklus In der Immobilienwertschöpfungskette bedient das Gros der Teilnehmer den Betrieb die Bewirtschaftung von Immo-bilien, wobei jedoch im Durchschnitt 3,2 Lebenszyklusphasen von den Prop-Techs bedient werden. Somit bewegen sie sich tendenziell nicht in den tradierten Grenzen und Prozessen der Immo-bilienwirtschaft. Die meisten PropTechs mit hohen Umsätzen sind in der Be-wirtschaftung oder Vermarktung von Immobilien aktiv. Als Assetklasse dominiert klar Wohnen, gefolgt von Büro und Mixed-Use, wobei aber ein Prop-Tech durchschnittlich 4,3 Assetklassen bedient. Im Wohnsegment dominieren jedoch die PropTechs mit noch sehr geringen Umsätzen. Hier herrscht auch der höchste B2C Anteil der Assetklassen vor. Nur 20,5% der PropTechs legen sich auf eine Assetklasse fest. Aktuelle Lage des deutschen PropTech-Marktes Für das Jahr 2020 empfinden die Prop-Techs die Auftragslage als äußerst posi-tiv, und auch der mittelfristigen Entwicklung der Jahre bis Ende 2023 blickt eine überwältigende Mehrheit positiv entgegen. So verzeichneten in 2020 70,8% der PropTechs mehr Neugeschäft, davon 35,9% deutlich mehr Neugeschäft. Für 2021 bis 2023 erwarten 52,4% der PropTechs deutlich mehr Neugeschäft und insgesamt über 91,4% sehen positive Vorzeichen für die Marktentwicklung. Hinsichtlich des Corona-Effekts konn-ten die Unternehmen mehrheitlich eher von der Pandemie profitieren; für die Zukunft ergibt sich ein aus ihrer Sicht noch positiveres Bild. Ganze 66,5% erwarten zukünftig eine Zunahme ihres Geschäftes durch Corona und weitere 26,0% sehen keine Auswirkungen. Lediglich 7,6% erwarten pandemiebedingt eine Abnahme des eigenen Geschäfts. Nach eigenen Einschätzungen gehören PropTechs also mehrheitlich zu den Gewinnern der Pandemie. Herausforderungen für PropTechs im deutschen Immobilienmarkt In der Studie wurden drei Phasen des proptechseitigen Vermarktungsprozesses untersucht: Aufbau des Geschäftsmodells, Produktverkauf und Implemen-tierung. Die Phase des Produktverkaufs ist für 53% der PropTechs die hürden-reichste Phase deutlich vor dem Aufbau des Geschäftsmodells und Implementierung beim Kunden. Die wesentlichen Herausforderungen beim Aufbau des Geschäftsmodells sind für alle Prop-Tech-Cluster die Entscheidungsstrukturen beim Kunden, gefolgt von dem geringen Druck zur Digitalisierung in der Immobilienbranche und Produktentwicklungskosten sowie der Zugang zu Daten, wobei dieser für Early Stager am schwierigsten erscheint. In der Phase des Produktverkaufs zeigt sich, dass die größte Hürde in der geringen Risikobereitschaft des Establishments, in Technologien von PropTechs zu investieren, liegt - gepaart mit mangelndem Vertrauen und einem mangelnden Verständnis in Bezug auf die Technologie sowie das Potenzial der Produkte. Weiterhin liegt im schwierigen Zugang zum richtigen Ansprechpartner eine wesentliche Verkaufshürde. Hier ergibt sich aus Sicht der PropTechs, dass die operativ verantwortliche Fach-abteilung im Establishment, in der das Produkt angewendet würde, der wesentliche Influencer für die Kaufentscheidung ist. Als relevantester Ent-scheider wird hingegen mehrheitlich der CEO gesehen. Dies kann ein Hinweis darauf sein, dass Digitalisierungsent-scheidungen immer noch auf strategischer Ebene getroffen werden. Prop-Techs, die es bei einem Kunden bis zur Implementierung geschafft haben, sind über den Berg der Hürden und sehen sich fortan nur moderateren Herausforderungen gegenüber. Von diesen sind die mangelnde Priorität des Projektes auf Kundenseite sowie fehlende C-Level-Sponsorship bzgl. der Durchsetzung von Entscheidungen die wesentlichen Herausforderungen. Somit sehen sich PropTechs mit wenig Unerwartetem bei der Implementierung konfrontiert, dürfen aber auch keine Priorität und Unterstützung vom Kunden erwarten. Kooperationen Kooperationen zwischen PropTechs sind überwiegend technischer Natur und haben einen hohen Stellenwert; 71,9% der Bef ragten haben bereits horizontale oder vertikale Kooperationen. Ziele sind hier meist Umsatz-, Netzwerk- und Zielgruppenerweiterung. Die Kooperationsbereitschaft nimmt mit steigendem Reifegrad der PropTechs zu; am ausgeprägtesten ist sie bei Conquerers, wo Kooperationen als Vorteil des Markteintritts nach Deutschland interpretiert werden können. Durch vertikale Kooperationen können PropTechs den Kunden ein er-weitertes bzw. kompletteres Lösungs-portfolio sowie teilweise eine deutlich breitere Anzahl an Use Cases anbieten. Damit einhergehend stehen auch die Themen Ökosystem und Plattformen. PropTechs können mittels Partnerschaften / Kooperationen einen größeren Teil der Wertschöpfungskette abbilden, ihre Angebote bündeln und somit „one stop shop” Lösungen für die Kunden anbieten. KW - Immobilienwirtschaft KW - Digitalisierung Y1 - 2021 UR - https://www.iiwm.de/wp-content/uploads/2021/03/PropTech-Germany-2021-Studie-2.pdf ER - TY - CHAP A1 - Cotroneo, Vincenzo A1 - Bruni, Ricardo A1 - Döhring, Thorsten A1 - Ferreira, Desiree A1 - Gibertini, Eugenio A1 - Henriksen, Peter A1 - Magagnin, Luca A1 - Massahi, Sonny A1 - Pareschi, Giovanni A1 - Romaine, Suzanne A1 - Sethares, Leandra A1 - Sironi, Giorgia A1 - Spiga, Daniele A1 - Tagliaferri, Gianpiero A1 - Valsecchi, Giuseppe T1 - Development of low-density coatings for soft x-ray reflectivity enhancement for ATHENA and other missions T2 - Proceedings of SPIE N2 - Metallic coatings made of precious metals (e.g. Ir, Pt or Au) with high atomic number Z have been traditionally employed at grazing incidence for X-rays reflection and focalization. These materials offer a range of reflection extended to higher energies, but also present a series of absorption edges, which limit the reflectivity in the 2-4 keV band and below. Therefore the search for alternative coatings, able to improve the reflection in the soft energy range, is particularly relevant for the development of future telescopes, like ATHENA (ESA), Lynx (NASA) and eXTP (CAS). Low-Z overcoatings (e.g. carbon or B4C), applied on top of the high-Z metallic layer, can enhance the reflectivity in the softer band (mainly below 2 keV), but conventional deposition methods for these materials are not easily compatible with some of the mainstream technologies for mirror fabrication (notably, the silicon pore optics that will be used for the ATHENA X-ray mission which is being implemented by ESA). In this work we discuss novel solutions (carbon-like overcoatings realized by dip coating or vapor phase deposition), which can be particularly convenient for the application to ATHENA and to future telescopes. KW - X-ray KW - optics KW - ATHENA KW - iridium KW - reflectivity KW - Röntgenteleskop Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2599803 VL - 2021 IS - 11852 SP - 118524P-1 EP - 118524P-13 PB - SPIE ER - TY - RPRT A1 - Lossau, Tobias A1 - Focke, Christian T1 - REITs in Europa : ein Vergleich von rechtlichen Rahmenbedingungen und Marktkapitalisierungen T2 - IIWM-Paper No. 4: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier liefert eine vergleichende Bestandsaufnahme des REIT-Marktes in Eu-ropa. Für ausgewählte Länder (Deutschland, Großbritannien, Frankreich, Belgien und Nieder-lande) wird analysiert, wie die wesentlichen rechtlichen Regelungen bezüglich REITs in dem Land aussehen, wobei Gemeinsamkeiten und Unterschiede der nationalen Regelungen deut-lich werden. Dabei wird auch dargestellt, wie sich der REIT-Markt des jeweiligen Landes unter den dort gegebenen Voraussetzungen entwickelt hat. Dieser Teil der Analyse liefert sowohl Informati-onen zu den wichtigsten REIT-Gesellschaften wie auch zur gesamten Marktkapitalisierung des REIT-Segments in dem Land. Das Arbeitspapier schließt mit dem Fazit, dass sich die Ausgestaltung des REIT-Regimes auf die Entwicklung dieses Kapitalmarktsegments in den jeweiligen Ländern erkennbar ausgewirkt hat. KW - Immobilienfonds auf Aktien KW - Europäische Union Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196580/1/1664852808.pdf ER - TY - RPRT A1 - Bauer, Christine A1 - Rock, Verena T1 - Die Revitalisierung von Shopping-Centern in Deutschland : Auswirkungen aktueller Trends auf das Shopping-Center Konzept T2 - IIWM-Paper No. 5: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Revitalisierung von Shopping-Centern in Deutschland. Mit diesem Papier wird das zentrale Ziel verfolgt, zu analysieren, welche Aus-wirkungen ausgewählte, aktuelle Trends auf den Einzelhandel und auf Shopping-Center ha-ben. Des Weiteren wird untersucht, welche Maßnahmen im Zuge einer Revitalisierung nötig sind, damit Shopping-Center in Zukunft erfolgreich am Markt bestehen können, oder ob das Konzept dieser Asset-Klasse generell nicht mehr zukunftsfähig ist. In diesem Zusammenhang werden auch Erfolgsfaktoren, Chancen und Risiken analysiert, die speziell im Zusammenhang mit der Revitalisierung von Shopping-Centern relevant sind. Um eine fundierte Ausarbeitung der genannten Punkte liefern zu können, wurde eine empirische Studie in Kooperation mit dem German Council of Shopping Centers e.V. durchgeführt. Diese wird im Rahmen des Arbeits-papiers mit der Revitalisierungsstudie von Sturm (2006)1, der letzten empirischen Analyse zu diesem Thema für den deutschen Markt, verglichen. KW - Einkaufszentrum Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196581/1/1664853367.pdf ER - TY - RPRT A1 - Richter, Sandra A1 - Schöne, Lars Bernhard T1 - Immobilien-Benchmarking : Clustern heterogener Immobilienbestände durch Regressionsanalysen T2 - IIWM-Paper No. 6: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit Immobilien-Benchmarking. Zentrales Ziel der Schrift ist es, einen Einblick in die bisherige Etablierung des Benchmarkings in den Managementebenen der Immobilienwirtschaft zu gewinnen und die Eigenschaft der Heterogenität der Immobilien im Benchmarking hervorzuheben. Dabei wird das Portfoliomanagement, das Asset Management, das Property Management sowie das Facility Management in Bezug auf die Potenzialhebung betrachtet. Weiterhin wird auch einen Einblick in die Regressionsanalyse gegeben. Um den Faktor der Heterogenität zu berücksichtigen, gilt es entsprechende Cluster abzuleiten. Beispielhaft wird eine Clusteranalyse plakativ an einem reduzierten Modell dargestellt. Im Fazit wird zusammenfassend auf die bisherige Etablierung des Benchmarkings in der Immobilienwirtschaft eingegangen sowie auf weitere Forschungsansätze hingewiesen. KW - Immobilienbewertung KW - Benchmarking Y1 - 2019 UR - https://www.econstor.eu/bitstream/10419/196582/1/1664854673.pdf ER - TY - RPRT A1 - Neeb, Nora A1 - Schöne, Lars Bernhard T1 - Investmentmarkt für Logistikimmobilien im Kontext der Covid-19-Pandemie T2 - IIWM-Paper No. 7: Schriftenreihe des IIWM Institut für Immobilienwirtschaft und -management N2 - Dieses Arbeitspapier beschäftigt sich mit der Analyse des Investmentmarktes für Logistikimmobilien mit der Fokussierung auf die Covid-19-Pandemie. Zentrales Ziel der Schrift ist es, den Investmentmarkt für Logistikimmobilien und die Auswirkungen, die die Covid-19-Pandemie auf diesen genommen hat, zu analysieren. Dabei werden die (Mega-)Trends auf welche die Pandemie Einfluss genommen hat, beleuchtet. Weiterhin werden wichtige Marktkennzahlen eines Investmentmarktes definiert. Diese Kennzahlen, sowie weitere essentielle Marktparameter dienen anschließend der Marktanalyse des Jahres 2019. Darauf folgt eine detaillierte Betrachtung der Marktentwicklung 2020 – dem Covid-Jahr. Hierbei werden die vier Quartale gesondert analysiert um etwaige Veränderungen erkennen zu können. Im Fazit erfolgt eine ausführliche Zusammenfassung der aktuellen Stimmung auf dem Logistikinvestmentmarkt und es wird ein vorsichtiger Blick auf künftige Entwicklungen geworfen. KW - Gewerbeimmobilien KW - Logistikunternehmen KW - COVID-19 Y1 - 2021 UR - https://www.iiwm.de/wp-content/uploads/2021/06/IIWM-Paper-No-7-Logistik-Neeb_Schoene-ISSN2568-5872.pdf ER - TY - CHAP A1 - Kefer, Stefan A1 - Roth, Frederick A1 - Kaloudis, Michael A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Monitoring of Composite Bicycle Components using Polymer Planar Bragg Gratings T2 - SMSI 2021 - Sensors and Instrumentation N2 - This study demonstrates mobile load monitoring of a composite bicycle component using an application- customized polymer planar Bragg grating sensor, evaluated by a mobile interrogation unit. After a referencing procedure, the mechanical load of a seat post is monitored while cycling through a test track. KW - Bragg Grating KW - Composites KW - Cyclic Olefin Copolymers KW - Micromilling KW - Load Monitoring KW - Bragg-Reflektor KW - Verbundwerkstoff KW - Fahrrad Y1 - 2021 UR - https://www.ama-science.org/proceedings/details/3992 SN - 978-3-9819376-4-0 U6 - https://doi.org/10.5162/SMSI2021/B9.2 SP - 161 EP - 162 PB - AMA Service GmbH CY - Wunstorf, Germany ER - TY - GEN A1 - Giovanni, Pareschi A1 - Döhring, Thorsten A1 - Valsecchi, Guiseppe A1 - Magagnin, Luca A1 - Bradshaw, Miranda A1 - Burwitz, Vadim A1 - Civitani, Marta Maria A1 - Cotroneo, Vincenzo A1 - Gibertini, Eugenio A1 - Pelliciari, Carlo A1 - Sironi, Giorgia A1 - Yang, Yang T1 - Enhancing the ATHENA effective area at low x-ray energies with unconventional overcoatings T2 - Proceedings of the X-RAY ASTRONOMY 2019 conference N2 - Low density overcoatings (mainly based on materials containing Carbon) onto usual hi Z materials (like Ir, Au or Pt) have been proposed more than 10 years ago for enhancing the X-ray reflectivity at low energy (between 0.5 and 4 keV) in X-ray astronomical optics. The hack is to use the total reflection from the low density material (which do not suffer much the photoelectric absorption) at low energy, while the photons at high energy are reflected by the high density material. Now for several future projects like e.g. ATHENA and eXTP it is foreseen the use of low density overcoatings that will importantly increase the effective area at low energy. In this poster we will discuss about the use of materials different from the ones considered so far, in particular based on a thin layer of Chromium followed by another layer of a Carbon-like material, and of novel approaches for their application. N2 - Poster KW - X-ray KW - mirror KW - coating KW - reflectivity KW - ATHENA KW - Röntgenteleskop Y1 - 2019 UR - https://indico.ict.inaf.it/event/720/contributions/5665/ VL - 2019 SP - 1 EP - 1 ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Marsikova, Veronika A1 - Hudec, Rene A1 - Flachs, Dennis A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Rukdee, Surangkhana A1 - Müller, Thomas A1 - Schmidt, Thomas A1 - Inneman, Adolf A1 - Klementova, Mariana A1 - Zeising, Sebastian A1 - Langmeier, Andreas T1 - Lobster eye type X-ray telescope with chromium-iridium coated tri-layer mirrors T2 - Proceedings of SPIE N2 - For space-born astronomical X-ray telescopes, iridium-based reflective layer systems are known as highly effective mirrors coatings. During the recent years, Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague jointly developed stress compensated chromium-iridium coatings for this application. To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium were applied in addition. Now a prototype of a wide-field, imaging X-ray telescope of Lobster Eye type is assembled at the company RIGAKU. For this purpose a small series of 34 mirrors based on 100 x 50 mm semiconductor grade silicon substrates has been coated at Aschaffenburg University. The applied tri-layer system consists of a stack of 40 nm chromium, which act as adhesive layer and compensates layer stress, a 30 nm iridium thick reflective layer, and an additional overcoat layer of 6 nm chromium. This layer system have been analysed by AFM and TEM images. The mirrors are assembled into an aluminium frame to build a 2D Lobster Eye type telescope. The designed focal length of this wide field X-ray telescope is two meter. To study the performance of the tri-layer coating system, a twin LE telescope with convenient gold coatings was manufactured also. Performance measurements of both telescopes and under same conditions are planned at the PANTER test facility at the Max-Planck Institute for Extraterrestrial Physics. First experimental results, their comparison with theoretical simulations and the comparison between both models will be presented in this contribution. KW - telescope KW - Lobster Eye KW - X-ray KW - mirror KW - iridium KW - Röntgenteleskop KW - Röntgenspiegel Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2589266 VL - 2021 IS - 11776 SP - 1177605-1 EP - 1177605-8 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Zeising, Sebastian A1 - Flachs, Dennis A1 - Stehlikova, Veronika A1 - Burwitz, Vadim A1 - Krumrey, Michael K. A1 - Cotroneo, Vincenzo A1 - Klementova, Mariana T1 - Characterisation of X-ray mirrors based on chromium-iridium tri-layer coatings T2 - Proceedings of SPIE N2 - Iridium-based layer systems are highly effective mirror coatings for space-born X-ray telescopes. During the recent years, Aschaffenburg University of Applied Sciences and its partners developed stress compensated chromium-iridium coatings for such astronomical applications, using chromium as an adhesive layer between iridium reflective layer and mirror substrate. However, there was room for improvement: To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy, thin overcoat layers of chromium are applied in addition now. This layer system has been analyzed by atomic force microscopy and transmission electron microscopy images. Furthermore, the reflectivity of such innovative X-ray mirrors based on chromium-iridium tri-layer coatings was recently measured at PTB's four-crystal monochromator beamline at the synchrotron radiation facility BESSY II. The experimental results, obtained for photon energies between 1.9 keV and 11 keV at two grazing incidence angles (0.6 degree and 0.9 degree) and their comparison with corresponding simulations are presented in this contribution. When compared to simulations of pure iridium coatings, a significantly higher reflectivity was achieved especially in the soft X-ray regime between 2 keV and 4 keV. Such chromium-iridium tri-layer coatings have high potential to increase the effective area for X-ray telescopes in Lobster Eye Design, for Wolter-I type X-ray optics, and for silicon pore optics as considered for the ATHENA telescope of the European Space Agency. KW - iridium KW - mirror KW - X-ray KW - coating KW - telescope KW - Röntgenspiegel KW - Röntgenteleskop KW - Iridium Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1117/12.2592551 VL - 2021 IS - 11776 SP - 1177607-1 EP - 11776076 PB - SPIE ER - TY - GEN A1 - Döhring, Thorsten T1 - Advanced Materials and Manufacturing Technologies for Space Applications T2 - Proceedings of International Research Days N2 - The goal of this project is to develop satellite components for space-based astronomical satellite payloads. Thereby advanced materials like iridium and innovative manufacturing technologies will be applied. After environmental testing and space qualifications tests it is planned to do an astronomical experiment with a stratospheric balloon or a sounding rocket. The work is embedded in ACCASI („Aschaffenburg Competence Center for Astronomical and Space Instumentation“) N2 - Poster KW - satellite KW - iridium KW - telescope KW - mirror KW - Satellitentechnik KW - Iridium KW - Spiegelteleskop Y1 - 2021 VL - 2021 ER - TY - GEN A1 - Licciardello, Nadia A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Kolen´ko, Yury. V. A1 - Petrovykh, Dmitri Y. T1 - Innovative nanocomposite coatings for radiation shielding on satellites T2 - EuroNanoForum N2 - The current trend in development of low-cost satellites is based on small dimensions combined with advanced electronics. Traditionally, radiation-sensitive electronics on satellites are protected by tungsten or lead foils, which are high-density materials and contribute significantly to the overall mass of the satellite. Here, we design and investigate temperature-gradient-resistant lightweight silane-based composites containing micro- or nano-particles of W or WO3, taking inspiration from similar approaches in the medical field. While the polymeric matrix provides flexibility under thermal gradients (such as those occurring in satellites during their orbits) and low density, the particles enable shielding from soft X-rays and other radiation. For reference, thin tungsten films were deposited by magnetron sputtering. The properties of the two kinds of coatings were compared and the X-ray protective properties were investigated using both a custom-designed measurement setup and conventional X-ray absorption. The best performing radiation-protective coatings will be launched in a payload experiment on the INFANTE satellite. N2 - Poster KW - satellite KW - polymeric matrix KW - nanocomposite KW - radiation protection KW - Satellitentechnik KW - Strahlung Y1 - 2021 UR - https://euronanoforum2021.eu/ VL - 2021 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Freudenmann, Dominic A1 - Röcke, Nicole T1 - Nanostructured iridium catalysts for effective hydrogen peroxide decomposition T2 - EuroNanoForum N2 - The EU intends to restrict the use of critical fuels in space propulsion systems. These propellants like hydrazine are chemically aggressive, toxic and carcinogenic. Space propulsion of the future should be environmentally friendly, inexpensive, and easy to handle. Aschaffenburg University and DLR are currently developing environmentally friendly technologies for future satellite engines. Thereby rocket-grade hydrogen peroxide, which is foreseen as a substitute, is converted to uncritical water vapour and oxygen by an exothermic catalytic reaction on nanostructured iridium layers. The resulting hot gases provide the required amount of thrust. The iridium catalyst layers are coated onto ceramic pellets, using RF magnetron sputtering technology. The catalytic functionality was tested afterwards at the chemical laboratories of DLR. First experimental results show a significantly higher catalytic activity for nanostructured iridium surfaces than for smoother crystalline layers. N2 - Poster KW - satellite KW - propulsion KW - catalyst KW - iridium KW - hydrogen peroxide KW - Iridium KW - Katalysator KW - Satellitentechnik Y1 - 2021 VL - 2021 ER - TY - CHAP A1 - Lamotte, Julia T1 - Test 3 für Forschungsschwerpunkte Y1 - 2021 ER - TY - BOOK A1 - Bruhn, Heike T1 - Test 2 für Forschungsschwerpunkte Y1 - 2021 ER - TY - RPRT A1 - Keerl, Cornelia T1 - Test 1 für Forschungsschwerpunkte Y1 - 2021 ER - TY - BOOK A1 - Schildbach, Thomas A1 - Feldhoff, Patricia R. T1 - Der Konzernabschluss nach HGB und IFRS KW - Deutschland KW - Konzernabschluss KW - Deutschland Handelsgesetzbuch KW - International Financial Reporting Standards KW - Generally Accepted Accounting Principles Y1 - 2018 SN - 978-3-11-053539-6 U6 - https://doi.org/10.1515/9783110535723 PB - De Gruyter Oldenbourg CY - Berlin/Boston ER - TY - RPRT A1 - Feldhoff, Charlotte H. A1 - Liu, Yi A1 - Feldhoff, Patricia R. T1 - Does Microfinance have an impact on borrower’s consumption patterns and women’s empowerment? T2 - Weidener Diskussionspapiere Nr. 67 N2 - This paper conducts a thorough data analysis using cross-sectional data from a study carried out in Mexico including over 16,500 observations. In the study, clusters were selected in areas Compartamos Banco, a Microfinance institution (MFI), has not lent in before. The clusters were randomly assigned to either the treatment or the control group. The analysis suggests that Microfinance has a significant positive effect on school and food expenditure but no apparent effect on entrepreneurship. Using regression analysis, a significant positive effect on women’s empowerment and its positive effect on total consumption is found. KW - Mikrofinanzierung KW - Verbraucherverhalten KW - Frau KW - microfinance KW - consumption patterns KW - women’s empowerment KW - Mexico KW - Mexiko Y1 - 2019 ER - TY - CHAP A1 - Fehrenbacher, Dennis A1 - Rötzel, Peter A1 - Choo, Kim-Kwang Raymond T1 - Sentiment Analysis of Cyber-Attack Incident Reports T2 - ICIS 2021 N2 - This article examines sentiment of 12,821 reports on cyber-attacks on firms around the world from 2011 to mid-year 2019. With theworld wide web (www) and associated technologies connecting opinions worldwide, sentiment in the world wide web is an importantperspective to understanding developments in cyber-attacks and the public opinion thereof, because much of the public debate isshared online. Such sentiment can potentially explain developments in regulation and may be indirectly associated with the buildingof defense mechanisms of cyber-victims. Results show that the quantity of reports on cyber-attacks on firms has been increasing,but the sentiment of reports on cyber-attacks has been decreasing. Both trends reflect the increasing severity of the issue and arelikely contributing to regulatory responses. Results also show that the sentiment is conditional to the source that reports the cyber-attack. KW - Cyber Risk KW - Natural Language Processing KW - Information Systems KW - Cyber Security KW - Cyberattacke KW - Unternehmen KW - Computersicherheit Y1 - 2021 VL - 2021 ER - TY - RPRT A1 - Weithmann, Sabrina A1 - Fremery, Vincent T1 - China revolutioniert den Finanzsektor KW - Finanzen KW - China KW - Kapitalmarkt KW - Finanzwirtschaft Y1 - 2020 ER - TY - RPRT A1 - Weithmann, Sabrina T1 - Exportschlager chinesische Normen? KW - Export KW - China KW - China KW - Normung Y1 - 2018 ER - TY - RPRT A1 - Weithmann, Sabrina T1 - Marktführer der „neuen“ Arbeitskräfte – Chinesische Industrie- und Servicerobotik KW - Robotik KW - China KW - China KW - Robotik Y1 - 2019 ER - TY - JOUR A1 - Weithmann, Sabrina T1 - Standardization in China: Electric Vehicle Technology as Driver for Change in China’s Automotive Standardization JF - International Journal of Standardization Research (IJSR) N2 - Electric vehicle (EV) development in China emerged with the 863 program (1986) for high technologies and has received support since the 10th Five Year Plan. While standards were of no particular importance in the early years of EV development, standards have increasingly become subject to policies and programs. For instance, the promotion of ‘indigenous' or ‘home-grown' innovation is perceived as means to develop domestic standards and contribute to international standards. Alongside this target, the Chinese government mandated the development of an EV standardization roadmap to serve as a guideline for optimizing standardization work, promoting technical innovation and large-scale industrialization. It was even considered that EV standardization was a novel standard field that has the potential to secure China a forerunner position in technological development as well as international standardization, regardless of standard-setting practices in the conventional automotive sector. Against this background, this paper examines the differences in system set-up and processes of standardization for the traditional automotive and the electric vehicles sector. While conventional automotive standardization is limited to a single sector with the Ministry of Industry of Information Technology and the China Automotive Technology and Research Centre in charge, electric vehicles require the participation of stakeholders from other sectors. Therefore, the negative influence from the conventional decentralized automotive sector on the development of common nationwide standards like the dynamics between national, regional and local actors cannot be deprived. Additionally, this paper also highlights learnings from EV standardization that might set positive impulses for conventional EV standardizations. KW - China KW - Standardization KW - electric vehicles KW - China KW - Elektrofahrzeug KW - Standardisierung Y1 - 2016 VL - 2016 IS - 14 (2) SP - 20 EP - 32 ER - TY - CHAP A1 - Weithmann, Sabrina A1 - Schmack, Ulrich T1 - Benefits of e-mobility for cross-sector energy management BT - Mobilitätswandel konsequent entwickeln - 2. Internationale ATZ-Fachtagung T2 - Netzintegration der Elektromobilität 2017 KW - Elektromobilität KW - Energiemanagement KW - Elektromobilität KW - Energiemanagement Y1 - 2017 UR - https://www.springerprofessional.de/benefits-of-e-mobility-for-cross-sector-energy-management/15036976 SN - 978-3-658-19292-1 SP - 97 EP - 108 PB - Springer ER - TY - CHAP A1 - Weithmann, Sabrina T1 - The impact of China’s changing role in technology standardization BT - Wege zusammenführen 3. Internationale ATZ-Fachtagung T2 - Netzintegration der Elektromobilität 2018 N2 - China is taking on a new role in international trade. One of the most prominent events highlighting this new role has been the speech of Xi Jinping, the president of the Peoples Republic in China (PRC), at the World Economic Forum (WEF) in 2017. His speech has become famous as pro-globalization speech. It contrasted with the anti-globalization tendency proclaimed throughout the US president’s election campaign, who had assumed office shortly after the speech at the 2017 WEF. KW - Electromobility KW - Standardization KW - China KW - Elektromobilität KW - Standardisierung Y1 - 2018 UR - https://link.springer.com/chapter/10.1007/978-3-658-23393-8_2 SP - 9 EP - 18 PB - Springer ER - TY - BOOK A1 - Weithmann, Sabrina T1 - The Evolvement of Standards in China – Insight from the Electric Vehicle Sectors N2 - This book analyses why Chinese technology standards deviate from international standards. The research it contains is based on four periods of field research in Beijing that involved 70 expert interviews. The data gathered throughout these interviews resulted in a detailed case study on the Chinese standardisation system and particularly the electric vehicle sector. The book’s application of complexity theory shows that the evolvement of deviating standards is a substantial component in the development of the Chinese standardisation system. This is further explained by its use of a ‘Three Phase Standardisation Development Concept’. This book fills a gap in existing research, especially because it focuses on a developing country with a standardisation system that is in transition. KW - China KW - Standardization KW - Normung KW - China KW - Elektrofahrzeug KW - Standardisierung Y1 - 2018 SN - 978-3-8452-8623-5 PB - Nomos CY - Wiesbaden ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stritzelberger, Carolyn A1 - Mues, Kristin A1 - Schäfer, Kerstin A1 - Rosendahl, Wilfried A1 - Busch, Uwe T1 - Celebrating the Röntgen anniversary year: pupil experiments at Aschaffenburg University T2 - SPIE Proceedings N2 - On November 8th, 1895, Professor Wilhelm Conrad Röntgen was still working late on cathode rays in his laboratory at the University of Würzburg in Germany. By chance, he found a new type of radiation that was able to penetrate materials. He himself called them X-rays. In his honour, in Germany we call this type of radiation Röntgen´s rays since 1896. In 2020, Germany was celebrating the Röntgen anniversary year, recognizing the discovery of X-rays 125 years ago and the 175th birthday of its discoverer Wilhelm Conrad Röntgen, the first Nobel laureate in physics. Financed by a grant from the Klaus Tschira Foundation, the Reiss-Engelhorn-Museums in Mannheim and the German Röntgen Museum in Remscheid developed an “X-periments mobile” with interactive experiments for children and young people. Following the given motto "X-periments - making the invisible visible", this research station with optical experiments started traveling across Germany in the anniversary year and, due to the corona pandemic in the following year. In summer 2021, the “X-periments mobile” will make a guest appearance at Aschaffenburg University. The experimental set-ups enable school classes and students to gain an overview of optical technologies from infrared light to ultraviolet radiation to X-rays and gamma rays. The aim of the campaign is to inspire the young generation and to attract students for courses in science and technology. This contribution presents the historical discovery of X-rays, the “X-periments mobile” and its experiments, its intention, and the experiences from its stays at different places across Germany. KW - x-ray KW - Röntgen KW - education KW - Röntgen, Wilhelm Conrad, 1845-1923 KW - Jubiläum KW - Schülerversuch Y1 - 2021 UR - https://doi.org/10.1117/12.2589142 U6 - https://doi.org/https://doi.org/10.1117/12.2589142 VL - 2021 IS - 11776 SP - 117760E-1 EP - 117760E-10 PB - SPIE ER - TY - CHAP A1 - Graessler, Iris A1 - Dattner, Michael A1 - Bothen, Martin T1 - Main Feature List as core success criteria of organizing Requirements Elicitation T2 - R&D Management Conference, Milan, Italy 30. Juni - 4. Juli 2018 N2 - Innovation process and innovation output is positively affected by adequate reference models and supporting means. For this reason, a New V-Model for mechatronic and smart systems has been worked out by the Technical Committee VDI GMA 4.10 "Interdisciplinary Product Creation". Thus, the directive VDI 2206 "Development methodology for mechatronic systems" from the year 2004 (VDI 2206 2004) is being revised and adapted to the actual trend towards digital transformation of technical systems, business models and ecosystems. The core of the guideline is the V-Model describing mechatronic engineering (VDI 2206 2004). One core success criterium of organizing Requirements Elicitation is the established main feature list first published by Pahl and Beitz (Pahl et al. 1996). Based on this, a new Main Feature List enhanced for the usage in requirements elicitation of mechatronic and smart products is proposed. This Enhanced Main Feature List comprises additional requirements such as sampling rate, bus system, big data usage and fosters result quality and efficiency of requirements elicitation. This was proven and validated by applying it to Inline spectral measurement systems in the printing industry. The proposed Enhanced Main Feature List establishes new fundamentals in research and theory. KW - Mechatronik KW - Systementwicklung Y1 - 2018 ER - TY - CHAP A1 - Bothen, Martin A1 - Blumör, Alexander A1 - Pregitzer, Gerhard ED - Schulze, Sven-Olaf ED - Tschirner, Christian ED - Kaffenberger, Rüdiger ED - Ackva, Sascha T1 - Werkzeuge für die Entwicklung mechatronischer Systeme mit Methoden des MBSE BT - Paderborn, 08. – 10. November 2017 T2 - Tag des Systems Engineering N2 - Die Entwicklungsmethodik für mechatronische Systeme benötigt eine sehr gute Integrationsfähigkeit der verwendeten (Software-) Werkzeuge für den Systementwurf, den domänenspezifischen Entwurf, sowie für die Systemintegration. Hierzu wurden verschiedene Werkzeuge untersucht, die eine Abbildung des Model Based Systems Engineering (MBSE) ermöglichen. Insbesondere Werkzeugumgebungen für integriertes und föderiertes MBSE wurden untersucht. Ein Hauptaugenmerk wurde auf die Integration der Simulation in Verknüpfung mit SysML oder ähnlichen Modellen gelegt. Zu diesem Zweck wurde ein Referenzsystem mit verschiedenen Werkzeugen virtuell aufgebaut und der Umfang der Werkzeuge bewertet. Zum Aufbau des Referenzsystems wurde grundlegend mit dem RFLP-Ansatz und der FAS-Methode vorgegangen. Ferner wurde untersucht, ob die vorliegenden Methoden ausreichend sind, um MBSE mit den Werkzeugen zu betreiben. Die Arbeit zeigt, dass die Methoden im Umfeld des MBSE noch weiter ausgearbeitet werden müssen. KW - Mechatronik KW - Systementwicklung Y1 - 2017 SN - 978-3-446-45538-2 SP - 193 EP - 202 PB - Hanser ER - TY - JOUR A1 - Smeets, Mario A1 - Ostendorf, Ralf A1 - Rötzel, Peter T1 - AI and its Opportunities for Decision Making in an Organizational Context: A Systematic Review of the Influencing Factors on the Intention to use AI JF - Die Unternehmung – Swiss Journal of Business Research and Practice N2 - One domain of application of artificial intelligence (AI) is decision support, particularly in management. Although there are already research streams examining the interaction of AI and humans (e.g. the stream on "hybrid intelligence"), there are still numerous open research gaps – for example, a comprehensive overview of which factors favor the intention to use AI is missing. By conducting a systematic literature review, we identify the factors that potentially positively influence AI usage intentions for decision-making processes in organizations. From this, we create a framework that both provides practical implications for the successful use of AI in organizational decision-making processes and delivers further research approaches, for example, on the validity/ usability of proven IS adoption models in the present context. KW - Artificial Intelligence KW - Decision-making KW - Management Control KW - information systems KW - information management KW - Künstliche Intelligenz KW - Entscheidungsfindung KW - Management Y1 - 2021 VL - 2021 IS - OnlineFirst SP - 1 EP - 28 ER - TY - CHAP A1 - Voigt, Jorrit A1 - Möckel, Michael ED - Chinesta, R. ED - Abgrall, R. ED - Allix, O. ED - Kaliske, M. T1 - Comparing principal component analysis (PCA) and 𝛃-variational autoencoder(𝛃-VAE)for anomaly detection in selective laser melting (SLM) process data T2 - 14th WCCM-ECCOMAS Congress 2020, virtual congress, January, 11-15, 2021 N2 - The usability of machine learning approaches for the development of in-situ process monitoring, automated anomaly detection and quality assurance for the selective laser melting (SLM) process receives currently increasing attention. For a given set of real machine data we compare two established methods, principal component analysis (PCA) and -variational autoencoder (-VAE), for their applicability in exploratory data analysis and anomaly detection. We introduce a PCA-based unsupervised feature extraction algorithm, which allows for root cause analysis of process anomalies. The -VAE enables a slightly more compact dimensionality reduction; we consider it an option for automated process monitoring systems. KW - Anomaly detection KW - Process monitoring KW - additive manufacturing KW - Selektives Laserschmelzen KW - Anomalie Y1 - 2021 UR - https://www.scipedia.com/public/Voigt_Moeckel_2021a U6 - https://doi.org/10.23967/wccm-eccomas.2020.144 SP - 1 EP - 9 ER - TY - BOOK A1 - Borgeest, Kai T1 - Elektronik in der Fahrzeugtechnik N2 - Das Buch vermittelt die Grundlagen, um die Besonderheiten der Elektronik und Software im Kfz nicht nur zu kennen, sondern auch zu verstehen. Zusätzlich wird an Beispielen die Komplexität realer Systeme im Fahrzeug vorgeführt und gezeigt, welche Anwendungen durch die Elektronik erst möglich werden. Das Spannungsfeld zwischen Sicherheit, Zuverlässigkeit und Komplexität prägt in Verbindung mit branchenüblichen Abläufen das Vorgehen bei der Entwicklung, das ein in diesem Bereich tätiger Ingenieur verstehen muss. KW - Kraftfahrzeugelektronik KW - Kfz-Elektronik KW - Automobilelektronik KW - Steuergerät KW - Motorsteuerung KW - Fahrzeugtechnik Y1 - 2020 SN - 978-3-658-23663-2 U6 - https://doi.org/10.1007/978-3-658-23664-9 PB - Springer Vieweg CY - Wiesbaden ER - TY - CHAP A1 - Zindler, Klaus A1 - Sauer, Timm T1 - Self learning control for automatic track guidance T2 - Proceedings of International Research Days KW - automatic track guidance KW - self learning control KW - Artificial Intelligence KW - automated vehicle guidance KW - Autonomes Fahrzeug Y1 - 2021 VL - 2021 SP - 64 EP - 64 ER - TY - CHAP A1 - Zindler, Klaus T1 - Welcome & Key Research Areas of Aschaffenburg University of Applied Sciences T2 - Proceedings of International Research Days KW - Key Research Areas KW - Hochschule Aschaffenburg KW - Forschung Y1 - 2021 ER - TY - GEN A1 - Zindler, Klaus T1 - Wohin steuert das automatisierte Fahren? N2 - Vortrag KW - Autonomes Fahren KW - Autonomes Fahrzeug Y1 - 2018 ER - TY - JOUR A1 - Zindler, Klaus A1 - Doll, Konrad A1 - Huber, Bertold ED - WILEY-VCH, Verlag T1 - Sicher unterwegs - Fortschritte beim aktiven Fußgängerschutz JF - messtec drives Automation KW - aktiver Fußgängerschutz, automatische Brems- und Ausweichmanöver KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2017 UR - https://www.wileyindustrynews.com/restricted-files/161702 VL - 25 IS - 03 SP - 82 EP - 82 ER - TY - JOUR A1 - Döhring, Thorsten ED - IHK Aschaffenburg, T1 - Forscher entwickeln umweltfreundliche Satellitenantriebe JF - Wirtschaft am Bayerischen Untermain N2 - In der aktuellen Förderrunde des vom Bayerischen Staatsministeriums für Wissenschaft und Kunst aufgesetzten „Programms zur Förderung der angewandten Forschung und Entwicklung an Hochschulen für angewandte Wissenschaften – Fachhochschulen“ war die Technische Hochschule Aschaffenburg sehr erfolgreich. Für das Technologieprojekt ACCASI („Aschaffenburg Competence Center for Astronomical and Space Instrumentation“) erhält sie über eine Laufzeit von drei Jahren insgesamt 250.000 Euro. KW - Satellit KW - Triebwerk KW - Iridium KW - Katalysator KW - Satellitentechnik Y1 - 2021 UR - https://www.aschaffenburg.ihk.de/share/flipping-book/5064860/flippingbook.pdf VL - 2021 IS - März SP - 12 EP - 13 ER - TY - CHAP A1 - Angress, Alexandra A1 - Krauße, Sylvana T1 - The ulture factor: Lessons from a contribution to coil: Social interaction in COVID-19 times – a German university perspective T2 - Intercultural Competence at Work KW - Hochschulunterricht KW - Internationalisierung KW - COVID-19 Y1 - 2020 UR - https://www.theseus.fi/handle/10024/354179 SP - 36 EP - 54 PB - Publications of Seinäjoki University of Applied Sciences CY - Seinäjoki ER - TY - THES A1 - Staudt, Stefan T1 - Optimierter sensorloser Betrieb von Synchron-Reluktanzmaschinen in Nutzfahrzeugen KW - Nutzfahrzeug KW - Reluktanzmotor KW - Drehstrommaschine Y1 - 2020 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Vorbehaltsnießbrauch an GmbH-Anteilen: Gestaltungsempfehlungen in der Praxis JF - Erbfolgebesteuerung N2 - Der Nießbrauch an GmbH-Beteiligungen ist eine in der Praxis beliebte Gestaltungsform, die regelmäßig eine flexible Zuweisung von Vermögenssubstanz auf der einen und den daraus fließenden Erträgen auf der anderen Seite ermöglicht. Ja nach Zielsetzung werden unterschiedliche Nießbrauchsmodelle gewählt. Der Vorbehaltsnießbrauch wird häufig zur Gestaltung der Unternehmensnachfolge genutzt, während der Zuwendungsnießbrauch auf die Versorgung von Angehörigen im Rahmen der vorweggenommenen Erbfolge abzielt. Dieser Beitrag beschäftigt sich mit der Variante 1. In einem Folgebeitrag wird der Zuwendungsnießbrauch als Gestaltungsmodell auf den Prüfstand gestellt. KW - Vorbehaltsnießbrauch KW - GmbH KW - Gesellschaftsanteil KW - Nießbrauch KW - GmbH-Beteiligung KW - Unternehmensnachfolge KW - Gestaltungsempfehlungen KW - Zivilrecht KW - Einkommensteuerrecht KW - Schenkungsteuerrecht KW - Musterfall Y1 - 2021 VL - 2021 IS - 4 SP - 98 EP - 104 ER - TY - THES A1 - Putscher, Christian T1 - Drahtlose Energieübertragung für hohe Leistungen KW - Drahtlose Energieübertragung KW - Induktive Kopplung KW - Magnetischer Fluss KW - Leistungselektronik Y1 - 2020 SN - 978-3-8440-7563-2 PB - Shake ER - TY - THES A1 - Girschikofsky, Maiko T1 - Herstellung und Anwendung planarer Bragg-Gitter-Sensoren KW - Bragg-Reflektor KW - Optischer Sensor KW - Integrierter Sensor Y1 - 2020 SN - 978-3-8440-7561-8 PB - Shaker ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - Validated Undergraduates’ Misconceptions about Software Engineering T2 - Global Engineering Education Conference (EDUCON) KW - Software Engineering Y1 - 2021 PB - IEEE ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Borgeest, Kai T1 - Teaching Generic Competences in Software Engineering via E-Learning – An Evaluation T2 - International Conference on Teaching, Assessment and Learning for Engineering (TALE) KW - E-Learning KW - Software Engineering Y1 - 2020 SP - 311 EP - 316 PB - IEEE ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Saray, Nermin T1 - A Systematic Literature Review on Misconceptions in Software Engineering T2 - Proceedings of the The Fifteenth International Conference on Software Engineering Advances (ICSEA) KW - Softwareentwicklung Y1 - 2020 UR - https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjQ2KCbh7rvAhWW7aQKHfgpBOEQFjACegQIBBAD&url=http%3A%2F%2Fns2.thinkmind.org%2Farticles%2Ficsea_2020_1_10_10003.pdf&usg=AOvVaw1jFCohv5FyoeiAFU9gFOX0 SN - 978-1-61208-827-3 SP - 1 EP - 8 ER - TY - CHAP A1 - Klopp, Marco A1 - Abke, Jörg T1 - ‘Learning 4.0‘ – A Conceptual Discussion T2 - International Conference on Teaching, Assessment and Learning for Engineering (TALE) KW - E-Learning KW - Digitalisierung Y1 - 2018 SP - 679 EP - 684 PB - IEEE ER - TY - RPRT A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Chaoticity Versus Stochasticity in Financial Markets: Are Daily S&P 500 Return Dynamics Chaotic? N2 - In this study, we present a combinatory chaos analysis of daily wavelet-filtered (denoised) S&P 500 returns (2000–2020) compared with respective surrogate datasets, Brownian motion returns and a Lorenz system realisation. We show that the dynamics of the S&P 500 return series consist of an almost equally divided combination of stochastic and deterministic chaos. The strange attractor of the S&P 500 return system is graphically displayed via Takens’ embedding and by spectral embedding in combination with Laplacian Eigenmaps. For the field of nonlinear and financial chaos research, we present a bibliometric analysis paired with citation network analysis. We critically discuss implications and future prospects. KW - nonlinear dynamics KW - chaos KW - recurrence analysis KW - finance KW - financial market KW - Kreditmarkt KW - Chaostheorie Y1 - 2021 UR - https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3802753 ER - TY - CHAP A1 - Angress, Alexandra T1 - Strengthening international education and internationalization in uncertain times - Lessons from an EU onlline negotation simulation exercise T2 - Intercultural Competence at Work KW - Hochschulunterricht KW - Internationalisierung KW - Interkulturelles Verstehen Y1 - 2020 UR - https://www.theseus.fi/handle/10024/354179 N1 - https://www.seamk.fi/en/intercultural-competence-at-work-a-new-publication/ SP - 55 EP - 73 PB - Publications of Seinäjoki University of Applied Sciences CY - Seinäjoki ER - TY - BOOK A1 - Angress, Alexandra A1 - Wuttig, Siegbert ED - Alexandra, Angress ED - Wuttig, Siegbert T1 - Looking back and looking ahead: The ASEM Education Process - History and Vision 2008-2018 KW - Asia-Europe Meeting Y1 - 2018 SN - 978-3-86856-020-6 N1 - Publikationsflyer: https://www.lemmens.de/dateien/medien/ebooks/wissenschaft-hochschule-forschung/asem_flyer_a4_hohe_aufloesung.pdf PB - Lemmens Verlag GmbH CY - Bonn ER - TY - JOUR A1 - Lutz, Christian A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Efficient Ultrashort Pulsed Laser Processing by Dynamic Spatial Light Modulator Beam Shaping for Industrial Use JF - Journal of Laser Micro/Nanoengineering N2 - We report on the effect of different transversal beam shapes on the efficiency of ablation processes and the resulting surface characteristics. A possibility to efficiently apply ultrashort pulsed lasers with high average power is beam shaping. By using a cooled reflective based liquid crystal spatial light modulator to generate different spot distributions, it is possible to spatially allocate the available power to avoid excessive high fluences. In our experiments, we determine the optimal fluence to ablate the maximum volume per watt to be in the range of 0.2-0.4 J/cm². Based on this fluence, we increase the number of spots from one to a maximum of twenty to ablate steel in a multilayer scanning-based process. In this context, we examine the influence of different separation distances between the spots on the ablation efficiency and roughness. Subsequently to these investigations, we develop an efficient roughing process with higher ablation rates and a nearly constant roughness. KW - Ultrakurzzeitlaser KW - Lichtmodulator Y1 - 2021 U6 - https://doi.org/10.2961/jlmn.2021.01.2011 VL - 16 IS - 1 SP - 1 EP - 6 ER - TY - BOOK A1 - Balleis, Kristina T1 - Mitwirkungs- und Klagerechte anerkannter Naturschutzverbände BT - zugleich eine vergleichende Untersuchung der Regelungen in den Landesnaturschutzgesetzen N2 - Dissertation KW - Naturschutzrecht KW - Verbandsklage KW - Umweltschutzverbände KW - Mitwirkungsrechte KW - Verwaltungsverfahren KW - Mitwirkungspflicht KW - Naturschutzverein KW - Verbandsklage Y1 - 1996 SN - 3-631-49481-5 PB - Peter Lang CY - Frankfurt am Main ER - TY - JOUR A1 - Balleis, Kristina A1 - Kokemoor, Axel T1 - Umfang und Grenzen einer Ultra-vires-Kontrolle des Handelns von EU-Organen durch das BVerfG ("Honeywell"), Anmerkung zu BVerfG, Beschluss vom 06.07.2010, 2 BvR 2661/06 JF - juris PraxisReport Arbeitsrecht KW - Ultra Vires Kontrolle KW - Deutschland, Bundesrepublik, Bundesverfassungsgericht KW - Europäische Union KW - Kontrolle Y1 - 2010 VL - 2010 IS - 45, Anm. 6 ER - TY - BOOK A1 - Wörlen (verst.), Rainer A1 - Balleis, Kristina A1 - Angress, Alexandra T1 - Introduction to English Civil Law for German-Speaking Lawyers and Law Students, Vol. 2 KW - Englisches Recht KW - Common Law KW - Property Law KW - Real Estate Law KW - Anglo-American Law KW - Großbritannien KW - Privatrecht Y1 - 2011 SN - 978-3-86752-131-4 PB - Alpmann Schmidt CY - Münster ET - 4., revised edition ER - TY - CHAP A1 - Balleis, Kristina T1 - Das englische Rechtssystem im europäischen Spannungsfeld T2 - Recht im Dialog: Gedächtnisschrift für Rainer Wörlen KW - Großbritannien KW - Recht Y1 - 2013 SP - 704 EP - 714 PB - Nomos ER - TY - BOOK A1 - Wörlen (verst.), Rainer A1 - Schindler, Sven A1 - Balleis, Kristina T1 - Anleitung zur Lösung von Zivilrechtsfällen BT - Methodische Hinweise und 22 Musterklausuren N2 - Der ideale Einstieg in die zivilrechtliche Fallbearbeitung: Hilfestellung für alle, die mit ersten Klausuren im Zivilrecht konfrontiert sind. KW - Fallbearbeitung KW - Zivilrecht KW - Klausurtechnik KW - Musterklausuren KW - Juristische Arbeitstechnik KW - Bürgerliches Recht Y1 - 2020 SN - 978-3-8006-5999-9 PB - Franz Vahlen CY - München ET - 10., völlig überarbeitete und verbesserte Auflage ER - TY - RPRT A1 - Hartmann, Kilian A1 - Montserrat, Lluch A1 - Spurk, Christoph T1 - HoMethan - Operation of 5 m³ biogas digesters with manure and organic waste in Middle and South America N2 - Traditional small-scale biogas systems are struggling with several problems, e.g. reliability, limitations in the variety of feedstock, and costs. To overcome these problems a bag-reactor system, which includes stirring-units, was designed. The system has a capacity of 200 kg d 1 input and 5.0 m³ d-1 biogas output. Due to standardized components - available world-wide - the system could be built-up within one day. Also, maintenance and repair are manageable due to the standard components. The system could be operated with different feedstocks, does not need water for dilution and no electricity. From 2015 to 2020 a total of 40 of these biogas plants were installed in South/Middle America. The experiences from the plant operators were collected. Analyzes of gas quality and quantity as well as the quality of the residues were done. It shows that the gas production is stable, and the gas could be used for heating and electricity generation. The nutrition value of the residues is 2.5-times higher compared to the input materials, the plant tolerance also increases. It shows that small-scale biogas plants could be adapted to local requirements. It increases the added value in rural areas, reduces the purchase of fertilizers and fuels and reduces emissions. KW - biogas KW - balloon biogas KW - bag reactor KW - small biogas KW - HoMethan KW - Biogasanlage KW - Mittelamerika KW - Südamerika Y1 - 2020 ER - TY - BOOK A1 - Wörlen (verst.), Rainer A1 - Balleis, Kristina A1 - Angress, Alexandra T1 - Introduction to English Civil Law for German-Speaking Lawyers and Law Students, Vol. 1 KW - English Civil Law KW - Common Law KW - Case Law KW - Englisches Recht KW - Anglo-American Law KW - Großbritannien KW - Privatrecht Y1 - 2012 SN - 978-3-86752-237-3 PB - Alpmann Schmidt CY - Münster ET - 5., revised edition ER - TY - JOUR A1 - Stollenwerk, Manfred A1 - Döhring, Thorsten A1 - Freudenmann, Dominic A1 - Schäfer, Tobias A1 - Stadtmüller, Johannes A1 - Röcke, Nicole T1 - Sputtered highly effective iridium catalysts: a new approach for green satellite propulsion JF - Journal of Materials Science N2 - This work demonstrated the large potential of sputtered iridium metal for catalytic reactions shown by the example of decomposition of hydrogen peroxide (H2O2) for space propulsion systems. For this purpose, iridium was coated onto Al2O3 pellets by a sputter process under varied process parameters. Depending on previously selected parameters, the obtained metal-loaded pellets offer closed- and/or open-shell structures. Catalytic productivity of these first-generation iridium-sputtered catalysts was estimated in laboratory experiments and compared to platinum-loaded pellets. Under optimized sputter-process conditions, the reactivity is significantly improved compared to the platinum-impregnated pellets. The better catalytic productivity can be explained by the increased active surface area of the iridium layers on the pellets. The surface morphology and the microstructure of the iridium coating can be actively controlled by the sputter pressure. The results are in accordance with the sputtering process pressure tendency described by the Thornton Structure–Zone Model. KW - Iridium KW - Katalysator KW - Satellitentechnik Y1 - 2021 U6 - https://doi.org/https://doi.org/10.1007/s10853-021-05897-z VL - 2021 IS - 2021 SP - 1 EP - 11 ER - TY - RPRT A1 - Jost, Thomas A1 - Seitz, Franz T1 - Designing a European Monetary Fund: What role for the IMF? T2 - Institute for Monetary and Financial Stability, Working Paper Series No. 151 (2021) N2 - The so-called Troika, consisting of the EU-Commission, the European Central Bank (ECB) and the International Monetary Fund (IMF), was supposed to support the member states of the euro area which had been hit hard by a sovereign debt crisis. For that purpose, economic adjustment programs were drafted and monitored in order to prevent the break-up of the euro area and sovereign defaults. The cooperation of these institutions, which was born out of necessity, has been partly successful, but has also created persistent problems. With the further increase of public debt, especially in France and Italy, the danger of a renewed crisis in the euro area was growing. The European Stability Mechanism (ESM) together with the (strongly politicized) European Commission will replace the Troika in the future, following decisions of the EU Summit of December 2018. It shall play the role of a European Monetary Fund in the event of a crisis. The IMF, on the other side, will no longer play an active role in solving sovereign debt crises in the euro area. The current course is, however, inadequate to tackle the core problems of the euro zone and to avoid future crises, which are mainly structural in nature and due to escalating public debt and lack of international competitiveness of some member countries. The current Corona crisis will aggravate the institutional problems. It has led to a common European fiscal response ("Next Generation EU"). This rescue and recovery program will not be financed by ESM resources and will not be monitored by the ESM. One important novelty of this package is that it involves the issuance of substantial common European debt. KW - Europäische Union KW - Internationaler Währungsfonds KW - Schuldenkrise KW - Öffentliche Schulden KW - euro area, European Monetary Fund, International Monetary Fund, euro crisis, European Stability Mechanism Y1 - 2021 ER - TY - JOUR A1 - Abke, Jörg ED - Zentrum für Hochschuldidaktik (DiZ), T1 - Vorausgesetzte Kompetenzen – Die explizite Formulierung als Planungshilfe einer Lehrveranstaltung JF - Didaktik-Nachrichten N2 - Die Formulierung von angestrebten Kompetenzen im Zuge der kompetenzorientierten Lehre ist anerkannte Praxis für die Lehrveranstaltungsplanung und -gestaltung an Hochschulen. Dabei wird immer in die Zukunft gedacht. Implizit wird vorausgesetzt, dass alle Studierenden hinsichtlich fachlicher und methodischer Kompetenzbereiche das gleiche Niveau mit in die Lehrveranstaltung bringen. Beobachtungen und Befragungen zeigen jedoch ein anderes Bild. Insbesondere für fachliche Gebiete wie Grundlagen der Informatik sind die Vorkenntnisse sehr heterogen. Diese Heterogenität anzugehen, war ein Grund, über die vorausgesetzten Kompetenzen nachzudenken und diese explizit zu formulieren. Nur so kann ein Abholen an vorhandenen Wissensbeständen aller Studierenden gelingen. Dies führt auch dazu, dass die Motivation der Studierenden in der Lehrveranstaltung hoch gehalten wird. Gleichzeitig erleichterte die Formulierung der vorausgesetzten Kompetenzen die Planung der Lehrmethoden in der Veranstaltung sehr deutlich. In diesem Beitrag sollen das Vorgehen, die Durchführung der Lehrveranstaltung und die Erfahrungen exemplarisch beschrieben wer-den, die im Rahmen der Teilnahme am Zertifikat Hochschullehre – Profistufe des DiZ für eine Lehrveranstaltungsplanung in Informatik I an der Hochschule Aschaffenburg gesammelt werden konnten. KW - Hochschuldidaktik KW - Hochschullehre KW - Kompetenzorientierung KW - Informatik KW - Lehre KW - Kompetenzorientierter Unterricht Y1 - 2018 UR - https://diz-bayern.de/DiNa/06_2018 VL - 2018 IS - 06 SP - 44 EP - 51 ER - TY - CHAP A1 - Kreß, Viktor A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Pose Based Trajectory Forecast of Vulnerable Road Users Using Recurrent Neural Networks T2 - ICPR 2021: Pattern Recognition. ICPR International Workshops and Challenges N2 - In this work, we use Recurrent Neural Networks (RNNs) in form of Gated Recurrent Unit (GRU) networks to forecast trajectories of vulnerable road users (VRUs), such as pedestrians and cyclists, in road traffic utilizing the past trajectory and 3D poses as input. The 3D poses represent the postures and movements of limbs and torso and contain early indicators for the transition between motion types, e.g. wait, start, move, and stop. VRUs often only become visible from the perspective of an approaching vehicle shortly before dangerous situations occur. Therefore, a network architecture is required which is able to forecast trajectories after short time periods and is able to improve the forecasts in case of longer observations. This motivates us to use GRU networks, which are able to use time series of varying duration as inputs, and to investigate the effects of different observation periods on the forecasting results. Our approach is able to make reasonable forecasts even for short observation periods. The use of poses improves the forecasting accuracy, especially for short observation periods compared to a solely head trajectory based approach. Different motion types benefit to different extent from the use of poses and longer observation periods. KW - 3D human trajectory forecast KW - Vulnerable road users KW - 3D body pose KW - Fahrerassistenzsystem KW - Fußgänger KW - Radfahrer Y1 - 2020 SN - 978-3-030-68763-2 U6 - https://doi.org/https://doi.org/10.1007/978-3-030-68763-2_5 SP - 57 EP - 71 PB - Springer International Publishing CY - Cham ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Kefer, Stefan A1 - Hessler, Steffen A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Integration of Microfluidic and Photonic Components within Transparent Cyclic Olefin Copolymers by Using fs Laser JF - Journal of Laser Micro/Nanoengineering N2 - In this study, we report on the integration of microfluidic channels and optical components by focusing femtosecond laser radiation inside transparent cyclic olefin copolymer (COC) bulk material. An internal localized material modification is triggered based on nonlinear absorption of the laser radiation's high intensities inside the focal volume. The size and shape of the three-dimensional internal modification are controlled by using an adaptive beam shaping setup. The irradiated areas show a positive refractive index shift and can be used as Type I internal optical waveguides. Furthermore, precise control of the spatial pulse-to-pulse distance in combination with a suitable beam profile enables the integration of functional photonic elements, e.g., Bragg gratings, into the waveguide. Thus, it also enables the generation of integrated photonic sensors. In addition, internal fs laser-induced modifications are characterized by a lower thermal stability as compared to the pristine polymer material. By performing a post-annealing process step, internal hollow microstructures are created by gaseous degradation of the exposed areas. Circular microchannels can be generated in a deliberately chosen layout by employing motorized 3D stages. In comparison to etching-based fabrication methods the proposed technology facilitates unlimited channel lengths, as it omits restrictions arising from an etching selectivity and duration. Altogether, this contribution paves the way towards the fabrication of internal three-dimensional optofluidic devices, equipped with a photonic sensor. In contrast, microfluidic and photonic structures are both created by femtosecond laser direct writing inside of transparent polymers. KW - Femtosekundenlaser Y1 - 2021 U6 - https://doi.org/10.2961/jlmn.2021.01.2009 VL - 16 IS - 1 SP - 1 EP - 6 ER - TY - CHAP A1 - Laun, Ute A1 - Hummel, Katrin A1 - Rötzel, Peter T1 - The interdisciplinary nature of sustainability accounting – a systematic literature review and a network citation study T2 - Virtual Annual Congress of the European Accounting Association N2 - Sustainability accounting as a distinct discipline has evolved over the last decades and is still expanding. As a multidimensional concept, sustainability accounting, however, relates to various other disciplines and thus provides a suitable setting to examine the extent of interdisciplinarity in accounting research. This paper investigates sustainability accounting in in twofold way. First, it provides a comprehensive and systematic review of academic literature addressing sustainability accounting topics. Based on a systematic search strategy capturing articles in the fields of finance and accounting, management, economics, organization and behavioral research, and international business, we determine a sample of 5,245 articles. Descriptive findings show that equally large proportions of the sample articles are published in accounting, management, and organization journals. Using citation network analysis, we identify existing research clusters within this sample and analyse them with respect to their delineations and interactions. Our results reveal that cluster formation relates to specific subject areas with some clusters showing limited interactions to other subject areas, while other clusters are more “interdisciplinary”. Interviews with influential researchers from the most prominent clusters in the network complement the network analysis results, providing insights into the establishment of paradigms and patterns in academic research that lead to the failure of knowledge integration and impede the transfer of research insights into business and politics. KW - Accounting KW - Sustainability KW - Corporate social responsibility (CSR) KW - Systematic literature review KW - Citation network analysis KW - Rechnungswesen KW - Rechnungslegung Y1 - 2021 UR - https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3641722 VL - 2020 ER - TY - RPRT A1 - Vogl, Markus A1 - Rötzel, Peter T1 - Insights, Trends and Frontiers: A Literature Review on Financial and Risk Modelling in the Information Age (2008-2019) N2 - This study provides an overview of the model evolution and research trends in the field of financial and risk modelling by applying a bibliometric approach from 2008–2019 and an overall citation network analysis. We present a content analysis of contributing authors, countries, journals, main topics, agreements, disagreements and frontiers within the research community and highlight quantitative features such as implemented models, aggregated model-family combinations and algorithms. Moreover, we describe the data sets employed by researchers. Finally, we discuss insights, such as the main statement, namely the non-existence of a “single-best”-approach as well as the future prospects of our findings. KW - Financial Modelling KW - Literature Review KW - risk modelling KW - Quantitative Finance KW - Citation Network KW - Risikomanagment KW - Finanzwirtschaft KW - Modellierung Y1 - 2021 UR - https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3764570 ER - TY - CHAP A1 - Kress, Viktor A1 - Schreck, Steven A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Pose Based Action Recognition of Vulnerable Road Users Using Recurrent Neural Networks T2 - 2020 IEEE Symposium Series on Computational Intelligence (SSCI) N2 - This work investigates the use of knowledge about three dimensional (3D) poses and Recurrent Neural Networks (RNNs) for detection of basic movements, such as wait, start, move, stop, turn left, turn right, and no turn, of pedestrians and cyclists in road traffic. The 3D poses model the posture of individual body parts of these vulnerable road users (VRUs). Fields of application for this technology are, for example, driver assistance systems or autonomous driving functions of vehicles. In road traffic, VRUs are often occluded and only become visible in the immediate vicinity of the vehicle. Hence, our proposed approach is able to classify basic movements after different and especially short observation periods. The classification will then be successively improved in case of a longer observation. This allows countermeasures, such as emergency braking, to be initiated early if necessary. The benefits of using 3D poses are evaluated by a comparison with a method based solely on the head trajectory. We also investigate the effects of different observation periods. Overall, knowledge about 3D poses improves the basic movement detection, in particular for short observation periods. The greatest improvements are achieved for the basic movements start, stop, turn left, and turn right. KW - Fahrerassistenzsystem KW - Autonomes Fahrzeug KW - Fußgänger KW - Fahrrad Y1 - 2020 SN - 978-1-7281-2548-0 U6 - https://doi.org/10.1109/SSCI47803.2020.9308462 SP - 2723 EP - 2730 PB - IEEE CY - Canberra, Australia ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Realsplitting und Zusammenveranlagung JF - Familie und Recht (FuR) N2 - In dem Beitrag wird erläutert, dass getrennt lebende Ehegatten in der Regel nach Ablauf des Trennungsjahrs nicht mehr die Zusammenveranlagung und das Ehegattensplitting nach §§ 26, 26b EStG in Anspruch nehmen können. Es werden die steuerrechtlichen Auswirkungen, die sich durch die Zahlungen von Unterhaltsleistungen ergeben und zwar sowohl im Hinblick auf eine steuerliche Zusammenveranlagung als auch im Hinblick auf eine Inanspruchnahme des begrenzten Realsplittings nach § 10 Abs. 1 Nr. 1 EStG oder die Absetzung der Unterhaltsleistungen als außergewöhnliche Belastung i.S.von § 33a EStG, dargestellt. Anhand eines Fallbeispiels erfolgt die Prüfung von unterschiedlichen steuerlichen Varianten. KW - Realsplitting; begrenztes Realsplitting; Zusammenveranlagung; außergewöhnliche Belastung; KW - Unterhaltspflicht KW - Einkommensteuerrecht Y1 - 1996 VL - 1996 IS - 02 SP - 108 EP - 115 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Umwandlung von Personengesellschaften bei negativem Kapitalkonto JF - Gestaltende Steuerberatung N2 - Gesellschaftsrechtlich wird ein Verlustanteil, der nach dem vertraglichen oder gesetzlichen Gewinn- und Verlustverteilungsschlüssel auf einen Gesellschafter entfällt, von seinem Kapitalanteil abgeschrieben (§ 161 Abs. 2 i.V.m. § 120 Abs. 2 HGB). Einkommensteuerlich darf der einem Kommanditisten zuzurechnende Anteil am Verlust der KG weder mit anderen Einkünften aus Gewerbebetrieb noch mit Einkünften aus anderen Einkunftsarten ausgeglichen werden, soweit ein negatives Kapitalkonto des Kommanditisten entsteht oder sich erhöht (§ 15a Abs. 1 S. 1 EStG). Der Beitrag beschäftigt sich mit den Umwandlungsmöglichkeiten bei negativem Kapitalkonto und gibt Gestaltungsempfehlungen. KW - Personengesellschaft; negatives Kapitalkonto; Umwandlungsmöglichkeiten; Gestaltung; KW - Personengesellschaft KW - Negatives Kapitalkonto KW - Einkommensteuerrecht Y1 - 1996 VL - 1996 IS - 12 SP - 10 EP - 17 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Zustimmung zum begrenzten Realsplitting JF - Gestaltende Steuerberatung N2 - Bei der Einkommensteuerveranlagung des Unterhaltsverpflichteten können Unterhaltsleistungen an den geschiedenen oder dauernd getrennt lebenden Ehegatten bis zu einem Höchstbetrag als Sonderausgaben (§ 10 Abs. 1 Nr. 1 EStG) abgezogen werden. Der Unterhaltsempfänger hat die Unterhaltsleistungen insoweit als sonstige Einkünfte nach § 22 Nr. 1a EStG zu versteuern. Der Unterhaltsverpflichtete kann das begrenzte Realsplitting nur mit Zustimmung des Unterhaltsempfängers beantragen. Der Beitrag erläutert den Anspruch auf Zustimmung zum Realsplitting und die Verpflichtung zum Ausgleich von Nachteilen, die beim Unterhaltsempfänger entstehen. KW - begrenztes Realsplitting; Sonderausgabenabzug; sonstige Einkünfte § 22 Nr. 1a EStG; Verpflichtung zur Zustimmung; Nachteilsausgleich; KW - Unterhaltspflicht KW - Einkommensteuerrecht Y1 - 1997 VL - 1997 IS - 02 SP - 15 EP - 18 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - § 15a EStG und Verlustausgleich durch Leistung einer Einlage JF - Gestaltende Steuerberatung N2 - Der Beitrag beschäftigt sich mit der Vermeidung bzw. Abmilderung der Wirkungen des § 15a EStG. Die wohl einfachste Lösung ist die rechtzeitige Leistung einer Einlage, denn die "geleistete Einlage" bestimmt das Kapitalkonto des Kommanditisten. Wann gilt eine Einlage überhaupt als geleistet ? Außerdem werden drei Gestaltungsmöglichkeiten für eine Sacheinlage aufgezeigt. KW - § 15a EStG; Verlustausgleich; Leistung einer Einlage; Gestaltungsmöglichkeiten; KW - Verlustausgleich KW - Deutschland, Einkommensteuergesetz KW - Kommanditeinlage Y1 - 1998 VL - 1998 IS - 05 SP - 15 EP - 17 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - § 15a EStG bei Verlustausgleichs-Erklärungen JF - Gestaltende Steuerberatung N2 - Frühzeitige vertragliche Vereinbarungen über die Verlustzurechnung, sog. Verlustausgleichs-Erklärungen, ermöglichen es, die Wirkungen des § 15a EStG zu vermeiden. KW - § 15a EStG; Verlustausgleichs-Erklärungen; Verlustzurechnung; Vermeidung der Verlustverrechnung; KW - Verlustausgleich KW - Einkommensteuerrecht Y1 - 1998 VL - 1998 IS - 04 SP - 17 EP - 19 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - GmbH in der Krise: Besserungsvereinbarung oder Rangrücktritt - was ist sinnvoller? JF - Gestaltende Steuerberatung N2 - Wenn eine überschuldete GmbH Verbindlichkeiten gegenüber ihrem Gesellschafter hat, wird gern zu den Mitteln "Rangrücktritt" oder "Forderungsverzicht mit Besserungsvereinbarung" gegriffen. Dadurch kann die Überschuldung oftmals beseitigt werden. Die aktuelle Rechtslage erfordert es jedoch, die beiden Gestaltungsmöglichkeiten neu zu überdenken. KW - Rangrücktritt; Forderungsverzicht mit Besserungsvereinbarung; Überschuldung; Insolvenzrecht; Steuerrecht; KW - GmbH KW - Unternehmenskrise KW - Rangrücktritt KW - Unternehmenssanierung Y1 - 1998 VL - 1998 IS - 11 SP - 25 EP - 30 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Weiterbeschäftigung des Gesellschafter-Geschäftsführers nach der Pensionierung JF - Gestaltende Steuerberatung N2 - Aus unterschiedlichen Gründen kann es erwünscht sein, dass der Gesellschafter-Geschäftsführer auch nach Erreichen des ursprünglich vorgesehenen Pensionierungszeitpunkts für "seine" GmbH tätig bleibt und gleichzeitig Pensionszahlungen erhält. Ob die Weiterbeschäftigung negative steuerliche Konsequenzen hat, soll in dem Beitrag untersucht werden. KW - Weiterbeschäftigung des Gesellschafter-Geschäftsführers; Pensionierung; steuerliche Konsequenzen; KW - GmbH KW - Geschäftsführer KW - Betriebliche Altersversorgung KW - Steuerrecht Y1 - 1999 VL - 1999 IS - 08 SP - 263 EP - 266 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die Beendigung einer typisch stillen Gesellschaft JF - Gestaltende Steuerberatung N2 - Die Beendigung einer typisch stillen Gesellschaft kann auf verschiedene Art und Weise erfolgen, jedoch sind die steuerlichen Konsequenzen sehr unterschiedlich. In dem Beitrag werden verschiedene Möglichkeiten und Gestaltungshinweise vorgestellt. KW - typisch stille Gesellschaft; Beendigung; Gestaltungshinweise; KW - Stille Gesellschaft KW - Beendigung KW - Steuerrecht Y1 - 1999 VL - 1999 IS - 10 SP - 324 EP - 327 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Verlustnutzung bei Veräußerung von Anteilen an Kapitalgesellschaften (§ 17 EStG) JF - Gestaltende Steuerberatung N2 - Die Veräußerung von Anteilen an Kapitalgesellschaften ist nach § 17 EStG steuerlich relevant, wenn eine wesentliche Beteiligung vorliegt. Durch das Steuerentlastungsgesetz 1999/2000/2002 ist die Norm des § 17 EStG neu gefaßt worden. Ab Veranlagungszeitraum 1999 ist eine wesentliche Beteiligung gegeben, wenn der Veräußerer an der Gesellschaft zu mindestens 10 Prozent unmittelbar oder mittelbar beteiligt war. Die Musterfälle zeigen, dass bei Verlusten aus der Veräußerung wesentlicher Beteiligungen - neue - steuerliche Gestaltungsmöglichkeiten bestehen. KW - Veräußerung von Anteilen an Kapitalgesellschaften; § 17 EStG; Verlustnutzung; Gestaltungsmöglichkeiten; KW - Gesellschaftsanteil KW - Veräußerung KW - Kapitalgesellschaft KW - Einkommensteuerrecht KW - Deutschland, Einkommensteuergesetz Y1 - 1999 VL - 1999 IS - 11 SP - 355 EP - 357 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Scheidungsklausel und "Vorschaltung" des Ehegatten JF - Gestaltende Steuerberatung N2 - Um ein Grundstück aus dem Betriebsvermögen herauszuhalten, wird es oftmals nicht vom Betriebsinhaber, sondern von dessen Ehegatten erworben und anschließend an den Betriebsinhaber vermietet. Bei einem späteren Verkauf des Grundstücks (nach Ablauf der Spekulationsfrist) müssen dann die stillen Reserven nicht versteuert werden. Damit der Ehegatte das Grundstück erwerben kann, wird bei dieser Gestaltung oft der Weg gewählt, dass der Betriebsinhaber seinem Ehegatten vor Erwerb der Immobilie die erforderlichen Mittel schenkt. Die Gestaltung kann sich allerdings im Scheidungsfall als Bumerang erweisen. Salopp formuliert ist dann nämlich nicht nur der Ehegatte, sondern auch das Grundstück weg. Mit Urteil vom 4.2.98 (BStBl. II, 542) hat der BFH jedoch eine sog. Scheidungsklausel zugelassen. Danach kann vereinbart werden, dass im Falle der Beendigung des Güterstandes das Grundstück unentgeltlich auf den Betriebsinhaber zu übertragen ist. Das Urteil und die hieraus resultierenden Möglichkeiten zur Steuergestaltung werden in dem Beitrag vorgestellt. KW - Scheidungsklausel; Grundstücksvermietung zwischen Nichtunternehmer-Ehegatten und Unternehmer-Ehegatten; Vermeidung der Versteuerung von stillen Reserven; KW - Unternehmen KW - Grundeigentum KW - Ehescheidung KW - Steuerrecht Y1 - 2000 VL - 2000 IS - 04 SP - 111 EP - 115 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Einkünfteverlagerung auf Angehörige JF - Erbfolgebesteuerung N2 - Der Beitrag behandelt die steuerliche Anerkennung von Darlehensverträgen zwischen Personengesellschaft und Angehörigen der Gesellschafter aus zuvor geschenkten Beträgen. Der BFH (18.1.01, DStR 01, 479) hatte u.a. entschieden, dass Schenkung und Darlehen nicht allein deshalb abhängig sind, weil sie kurz hintereinander erfolgten. Die Finanzverwaltung, die derartige Gestaltungen ohnehin besonders kritisch prüft (BMF 1.12.92, BStBl I, 729), hat sich dem zwischenzeitlich angeschlossen (BMF 30.5.01, DB 01, 1338). Der Beitrag verdeutlicht die Problematik an einem Beispiel und gibt wertvolle Hinweise für die Gestaltungspraxis. KW - Schenkung/Darlehen; Einkünfteverlagerung auf Angehörige; steuerliche Anerkennung von Darlehensverträgen zwischen nahen Angehörigen; Gestaltungspraxis; KW - Darlehen KW - Schenkung KW - Personengesellschaft Y1 - 2001 VL - 2001 IS - 08 SP - 201 EP - 203 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Vorteile des Erwerbs von GmbH-Mänteln und Vorratsgesellschaften JF - Gestaltende Steuerberatung N2 - Mantelkäufe sind in der Praxis ein durchaus üblicher Vorgang. Neuerdings werden auch unter Einsatz des Internets GmbH-Mäntel angeboten (siehe z.B. www.mantelkauf.de; www.techno-treuhand.de; www.allconsult-gmbh.de). Das Interesse der Erwerber am Mantelkauf besteht zumeist darin, den Geschäftsbetrieb sofort aufnehmen zu können, ohne das zeitraubende Eintragungsverfahren in das Handelsregister abwarten zu müssen, das im Rahmen einer Gesellschaftsneugründung notwendig ist. Gleichzeitig möchten die Erwerber die Haftungsgefahren aus der Gründungsphase einer Gesellschaft vermeiden. Manchmal besteht die Motivation auch darin, das erforderliche Mindeststammkapital nicht leisten zu müssen. Dieser Beitrag will Vorteile und Gefahren eines Mantelkaufs bzw. der Mantelverwendung darstellen. Dabei soll deutlich werden, dass der Erwerb einer sog. Vorratsgesellschaft dem Erwerb eines "gebrauchten" GmbH-Mantels vorzuziehen ist. Da der Mantelkauf seine steuerliche Attraktivität, d.h. die Nutzung von Verlusten der übernommenen GmbH, durch § 8 Abs. 4 KStG weitgehend verloren hat, soll nachfolgend die wirtschaftliche Seite im Vordergrund stehen. KW - Wirtschaftliche Vorteile Mantelkauf; Vorratsgesellschaft; GmbH-Mantel; Gefahren der Mantelverwendung; KW - Mantelkauf, Gesellschaftsrecht Y1 - 2000 VL - 2000 IS - 10 SP - 332 EP - 335 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Ist eine Betriebsaufspaltung nach dem Systemwechsel ungünstig? JF - Gestaltende Steuerberatung N2 - Die Betriebsaufspaltung war bislang eine beliebte Gestaltungsmöglichkeit, um die wichtigen Aspekte der Haftungsbeschränkung, der Steuerminderung bzw. -vermeidung und der Nachfolgeplanung in oft idealer Weise miteinander zu verbinden. Als besonders erfolgreich kann die sog. "klassische" Betriebsaufspaltung bezeichnet werden, die durch ein Besitzpersonenunternehmen und eine Betriebskapitalgesellschaft gekennzeichnet ist. Der Systemwechsel zum 1.1.01 zwingt jedoch, die Vor- und Nachteile der Betriebsaufspaltung neu zu überprüfen. Der Beitrag zeigt auf, dass die Betriebsaufspaltung nun bei hohen Gewinnen der Betriebskapitalgesellschaft und bei hohen Pachtzinsen äußerst nachteilig sein kann. KW - Rechtsform-Wahl; Betriebsaufspaltung; Haftungsbeschränkung; Steuerminderung; Steuervermeidung; Nachfolgeplanung; "klassische" Betriebsaufspaltung; Vor- und Nachteile; Systemwechsel; KW - Betriebsaufspaltung KW - Unternehmen KW - Steuerreform Y1 - 2001 VL - 2001 IS - 12 SP - 434 EP - 438 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - "Entsorgung" einer Betriebsaufspaltung JF - Gestaltende Steuerberatung N2 - Die Unternehmenssteuerreform 2001 hat bewirkt, dass die Betriebsaufspaltung nicht in allen Fällen attraktiv ist. Insbesondere bei hohen Pachtzinsen für das mobile Anlagevermögen kann die Gesamtsteuerbelastung von Besitz- und Betriebsunternehmen sogar deutlich höher liegen als bei der "reinen" GmbH oder dem "puren" Personenunternehmen. Möglicherweise ergibt sich daher das Bedürfnis, eine vorhandene Betriebsaufspaltung rückgängig zu machen. Der Beitrag zeigt Möglichkeiten der Rückabwicklung einer Betriebsaufspaltung, wobei er im Wesentlichen die Zusammenlegung von Besitz- und Betriebsunternehmen behandelt. Die Rückabwicklung kann dabei in der Weise erfolgen, dass entweder das Besitzunternehmen in der Betriebskapitalgesellschaft oder die Betriebskapitalgesellschaft in dem Besitzunternehmen aufgeht. Nachfolgend wird jeweils davon ausgegangen, dass es sich bei dem Besitzunternehmen um ein Einzelunternehmen oder um eine Personengesellschaft handelt ("klassische" Betriebsaufspaltung). KW - Rechtsform-Wahl; "Entsorgung" einer Betriebsaufspaltung; Möglichkeiten der Rückabwicklung; "klassische" Betriebsaufspaltung; Zusammenlegung von Besitz- und Betriebsunternehmen; KW - Betriebsaufspaltung KW - Rückabwicklung Y1 - 2002 VL - 2002 IS - 04 SP - 147 EP - 152 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Vor- und Nachteile von Finanzplankrediten aus wirtschaftlicher und steuerlicher Sicht JF - Gestaltende Steuerberatung N2 - Gewährt ein Gesellschafter seiner GmbH ein Darlehen, so sollte immer der Fall einer möglichen Krise oder Insolvenz einkalkuliert werden. Insbesondere sollte sichergestellt sein, dass der Gesellschafter eventuelle Darlehensverluste steuerlich geltend machen kann. Aus steuerlicher Sicht interessant sind sog. Finanzplankredite. Denn gehen diese verloren, führen sie stets mit ihrem Nennwert zu nachträglichen Anschaffungskosten einer Beteiligung i.S. des § 17 EStG. Dieser Beitrag untersucht das Finanzierungsinstrument "Finanzplankredit" und geht der Frage nach, inwieweit die steuerlichen Vorteile mit gesellschafts- und insolvenzrechtlichen Nachteilen verbunden sind. Ergänzend werden Musterformulierungen für den Finanzplankredit präsentiert. KW - Finanzplankredite; nachträgliche Anschaffungskosten; § 17 EStG; Gesellschaftsrecht; Insolvenzrecht; Musterformulierungen; KW - Finanzplanung KW - Gesellschafterdarlehen Y1 - 2002 VL - 2002 IS - 11 SP - 400 EP - 408 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Optimale Abfindungsklauseln in Gesellschaftsverträgen JF - Gestaltende Steuerberatung N2 - Der Beitrag beschäftigt sich mit Gestaltungsmöglichkeiten von Abfindungsklauseln in Gesellschaftsverträgen. Die Thematik ist von erheblicher Praxisrelevanz, da die auf § 738 Abs. 1 S. 2 BGB basierende Rechtsprechung dem ausscheidenden Gesellschafter grundsätzlich eine dem wirklichen Wert seiner Anteile entsprechende Abfindung (Verkehrswert) zubilligt, d.h., ohne gesellschaftsvertragliche Regelung ist die Abfindung auf der Grundlage des "wirklichen Werts des Unternehmens einschließlich aller stillen Reserven und einschließlich des good will des Unternehmens" zu ermitteln (vgl. § 738 Abs. 1 S. 2 BGB; BGH 21.4.55, BGHZ 17, 130/136). Das ist aber regelmäßig nicht gewollt. Welche Alternativen bestehen, wird in dem Beitrag untersucht. KW - Abfindungsklauseln in Gesellschaftsverträgen; Gestaltungsmöglichkeiten; KW - Gesellschaftsvertrag KW - Abfindungsklausel Y1 - 2004 VL - 2004 IS - 04 SP - 147 EP - 155 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Gestaltungen bei Verlusten im Rahmen einer Betriebsaufspaltung JF - Gestaltende Steuerberatung N2 - Im Rahmen einer Betriebsaufspaltung erwirtschaftet die Betriebs-GmbH häufig - langjährig - Verluste, während beim Besitzunternehmen dank vereinnahmter Miet- und Pachtzahlungen noch Gewinne erzielt werden. Dies birgt für die an der Betriebsaufspaltung beteiligten Unternehmen sowohl in gesellschafts- als auch in steuerrechtlicher Hinsicht Gefahren. Der folgende Beitrag stellt diese Gefahren dar und zeigt auf, wie ihnen gestalterisch begegnet werden kann. KW - Betriebsaufspaltung; Verluste der Betriebs-GmbH; gesellschaftsrechtliche Gefahren; steuerrechtliche Gefahren; Gestaltungsempfehlungen; KW - Betriebsaufspaltung KW - Verlust Y1 - 2004 VL - 2004 IS - 10 SP - 392 EP - 404 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Chancen und Risiken einer Betriebsaufspaltung im Lichte der Unternehmensteuerreform JF - Gestaltende Steuerberatung N2 - Die Betriebsaufspaltung wird oft als Gestaltungsmittel genutzt, um die wichtigen Aspekte der Haftungsbeschränkung, der Steuerminderung und der Nachfolgeplanung in idealer Weise miteinander zu verbinden. Dabei werden allerdings die Risiken dieser Rechtsform, die sich beispielsweise bei hohen Pachtzinsen oder bei der unfreiwilligen Beendigung einer Betriebsaufspaltung ergeben können, häufig unterschätzt. Oft wird übersehen, dass sich durch die Aufteilung eines Unternehmens in einen aktiven und einen passiven Teil der Beratungsbedarf und der Verwaltungsaufwand deutlich erhöhen. Die anstehende Unternehmensteuerreform 2008 ist ein willkommener Anlass, diese Rechtsform im Rahmen eines Musterfalls nochmals auf den Prüfstand zu stellen. KW - Betriebsaufspaltung; Vorteile und Nachteile; Nachfolgeplanung; Haftungsbeschränkung; Steuerminderung; Unternehmenssteuerreform 2008; Gestaltung; Musterfall; KW - Betriebsaufspaltung KW - Unternehmen KW - Steuerreform Y1 - 2007 VL - 2007 IS - 07 SP - 240 EP - 250 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Optimale "Entsorgung" einer Betriebsaufspaltung JF - Gestaltende Steuerberatung N2 - In der steuerlichen Beratungspraxis ist das Gestaltungsmodell der Betriebsaufspaltung seit vielen Jahren weit verbreitet. Doch die Änderungen durch die Unternehmenssteuerreform 2008 haben dafür gesorgt, dass eine Betriebsaufspaltung zumindest aus steuerlicher Sicht zunehmend an Attraktivität verliert. Bei der "Entsorgung" einer Betriebsaufspaltung ist allerdings höchste Sorgfalt geboten, um die steuerlichen Belastungen möglichst gering zu halten. Worauf man im Einzelnen achten muss, wird in diesem Beitrag dargestellt. KW - Betriebsaufspaltung; Einstimmigkeitsabrede; personelle Verflechtung; Besitzunternehmen; Betriebsunternehmen; Gestaltungsempfehlungen; KW - Betriebsaufspaltung KW - Steuerrecht Y1 - 2007 VL - 2007 IS - 12 SP - 444 EP - 451 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die Errichtung eines Betriebsgebäudes auf dem "Ehegattengrundstück" als Gestaltungschance ? JF - Gestaltende Steuerberatung N2 - "Doppelte AfA bei Bebauung eines Ehegattengrundstücks": So ähnlich lauteten die Reaktionen auf ein Urteil des BFH (9.3.16, X R 46/14) zur ertragssteuerlichen Behandlung eines Betriebsgebäudes, das ein Unternehmer auf einem auch dem Nichtunternehmer-Ehegatten gehörenden Grundstück errichtet hatte. Neben dem BFH hat sich auch die Finanzverwaltung ausführlich mit diesem Gestaltungsmodell beschäftigt (BMF 16.12.16, IV C 6 - S 2134/15/10003). In einem Musterfall werden Chancen und Risiken gegeneinander abgewogen und Alternativen vorgestellt. KW - AfA; Errichtung Betriebsgrundstück auf "Ehegattengrundstück"; Gestaltungschance; Musterfall; KW - Betriebsgrundstück KW - Ehegatte KW - Bebauung KW - Ertragsteuerrecht Y1 - 2017 VL - 2017 IS - 12 SP - 446 EP - 450 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Gewinnneutrale Realteilung als Gestaltungsmittel für Umstrukturierungen nutzen JF - Gestaltende Steuerberatung N2 - Sinn und Zweck der Realteilung einer Personengesellschaft ist nach Ansicht des BFH, wirtschaftlich sinnvolle Umstrukturierungen steuerlich nicht zu behindern, solange die Besteuerung der stillen Reserven sichergestellt ist. Als prominentes Beispiel könnte hier die Teilung von Aldi in Nord und Süd herhalten. Der BFH hat die Gestaltungsmöglichkeiten einer gewinnneutralen Realteilung jüngst deutlich erweitert. Nun ist nicht nur das Ausscheiden eines Mitunternehmers bei Abfindung mit einem Teilbetrieb oder Mitunternehmeranteil begünstigt. Auch eine Sachwertabfindung mit Einzelwirtschaftsgütern folgt jetzt Realteilungsgrundsätzen (BFH 30.3.17, IV R 11/15, BFH/NV 17, 1647). KW - gewinnneutrale Realteilung; Personengesellschaft; Umstrukturierungen; Gestaltungsempfehlungen; Sachwertabfindung; Einzelwirtschaftsgüter; KW - Personengesellschaft KW - Realteilung KW - Steuerrecht Y1 - 2018 VL - 2018 IS - 07 SP - 236 EP - 240 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Einstimmigkeitsabrede bei der Betriebsaufspaltung als Gestaltungsmittel nutzen JF - Gestaltende Steuerberatung N2 - In der Beratungspraxis wird zur Vermeidung einer Betriebsaufspaltung häufig empfohlen, im Besitzunternehmen einen "Nur..."-Besitzgesellschafter aufzunehmen und zudem im Gesellschaftsvertrag eine Einstimmigkeitsabrede für Gesellschafterbeschlüsse zu treffen. Dadurch soll die notwendige personelle Verflechtung zwischen Besitz- und Betriebsunternehmen verhindert werden. In diesem Beitrag wird hinterfragt, ob diese Gestaltung noch uneingeschränkt empfohlen werden kann und wann eine solche Einstimmigkeitsabrede zu unerwünschten Ergebnissen führt. KW - Betriebsaufspaltung; Einstimmigkeitsabrede; personelle Verflechtung; Besitzunternehmen; Betriebsunternehmen; Gestaltungsempfehlungen; KW - Betriebsaufspaltung KW - Gesellschaftsvertrag Y1 - 2008 VL - 2008 IS - 03 SP - 90 EP - 95 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Verlustausgleich: Einlage als Gestaltungsmittel JF - Gestaltende Steuerberatung N2 - In der Praxis wird immer wieder nach Gestaltungen gesucht, die die Wirkungen des § 15a EStG vermeiden bzw. abmildern können. Die wohl einfachste Lösung ist die rechtzeitige Leistung einer Einlage, denn die "geleistete Einlage" bestimmt das Kapitalkonto des Kommanditisten. Der Beitrag zeigt auf, wann eine solche Einlage zweckdienlich ist und worauf man bei entsprechenden Gestaltungen achten muss. KW - Kommanditisten; Verlustausgleich; Einlage als Gestaltungsmittel; § 15a EStG; Kapitalkonto Kommanditist; KW - Kommanditgesellschaft KW - Einkommensteuerrecht Y1 - 2009 VL - 2009 IS - 02 SP - 50 EP - 55 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die "Familien-KG" als Gestaltungsmittel nutzen: Rechtlich und steuerlich optimale Lösungen JF - Gestaltende Steuerberatung N2 - Eine Familiengesellschaft ist das ideale Gestaltungsmittel, um nahe Angehörige am eigenen Unternehmen zu beteiligen und dabei noch Steuern zu sparen. Sollen minderjährige Kinder beteiligt werden, bietet sich vor allem die Rechtsform der KG an, da die nur kapitalmäßige Beteiligung eines Kindes eine Aufteilung des Gewinns bewirkt, ohne dass hierdurch die Geschäftsführung der Eltern wesentlich berührt wird. In einem Musterfall wird aufgezeigt, welche gesellschaftsvertraglichen und steuerlichen Gestaltungsmöglichkeiten bestehen, um eine Familien-KG genau auf die eigenen Bedürfnisse zuzuschneiden. KW - Familiengesellschaft; KG; gesellschaftsvertragliche Gestaltungsmöglichkeiten; steuerliche Gestaltungsmöglichkeiten; kapitalmäßige Beteiligung Minderjähriger; KW - Familiengesellschaft KW - Unternehmensbeteiligung KW - Steuerrecht Y1 - 2010 VL - 2010 IS - 08 SP - 279 EP - 288 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die Aufnahme eines Partners in eine Einzelpraxis: Das "Mehr-Stufen-Modell" als Königsweg? JF - Gestaltende Steuerberatung N2 - Nachdem der Gesetzgeber dem allseits beliebten "Zwei-Stufen-Modell" den Boden entzogen hat, mussten in der Beratungspraxis neue Lösungen gefunden werden, um die Aufnahme eines Partners in eine Einzelpraxis zur Vorbereitung der Unternehmensnachfolge steuergünstig zu ermöglichen. Als Ausweichgestaltung biete sich hier das "Mehr-Stufen-Modell" an, dessen Umsetzung allerdings eine mehrjährige Realisierungsphase erforderlich macht. Alternativ kann es sich anbieten, die Einzelpraxis nach § 24 UmwStG in eine neu gegründete Sozietät einzubringen. KW - Aufnahme eines Partners in Einzelpraxis; Mehr-Stufen-Modell; Unternehmensnachfolge; Einbringung Einzelpraxis in neu gegründete Sozietät; § 24 UmwStG; Steuergestaltung; KW - Unternehmernachfolge KW - Steuerberatungsbetrieb Y1 - 2010 VL - 2010 IS - 11 SP - 399 EP - 404 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Steuergestaltungsspielräume beim Verkauf eines Betriebsgrundstücks nutzen JF - Gestaltende Steuerberatung N2 - Betriebsgrundstücke verfügen häufig über erhebliche stille Reserven, die bei einem Verkauf aufgedeckt werden müssen. Soweit der Veräußerungsgewinn als laufender Gewinn einzustufen ist, kann die hohe ertragsneuerliche Belastung schnell einen wesentlichen Teil des Veräußerungserlöses aufzehren. Eine Betriebsaufgabe ist daher - insbesondere wenn sich wegen erhöhtem Liquiditätsbedarf die Übertragung stiller Reserven auf ein Ersatzgrundstück nach R 35 EStR nicht anbietet - oft die steuerlich günstigere Lösung. KW - Steuergestaltung; Verkauf eines Betriebsgrundstücks; Vermeidung Aufdeckung stiller Reserven; Betriebsaufgabe; KW - Betriebsgrundstück KW - Verkauf KW - Steuerrecht Y1 - 2011 VL - 2011 IS - 12 SP - 419 EP - 423 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Realteilung als Gestaltungsmittel nutzen JF - Gestaltende Steuerberatung N2 - Als Gestaltungsmittel für die steuerneutrale Beendigung einer selbständig oder gewerblich tätigen Personengesellschaft biete sich die Realteilung i.S. von § 16 Abs. 3 S. 2 EStG an. In vielen Fällen kann die Aufdeckung stiller Reserven weitestgehend vermieden werden. Worauf man im Einzelnen achten muss und wann eine Nachversteuerung droht, wird in diesem Beitrag analysiert. KW - Realteilung; steuerneutrale Beendigung; Personengesellschaft, § 16 Abs. 3 S. 2 EStG; Vermeidung Aufdeckung stiller Reserven; Nachversteuerung KW - Personengesellschaft KW - Realteilung KW - Steuerrecht Y1 - 2011 VL - 2011 IS - 05 SP - 169 EP - 174 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die entgeltliche Übertragung von Anteilen an Personengesellschaften im Sonder-BV JF - Gestaltende Steuerberatung N2 - Der Beitrag beschäftigt sich mit den steuerlichen Folgen der entgeltliche Übertragung von Mitunternehmeranteilen sowie von Anteilen an Mitunternehmeranteilen mit Sonderbetriebsvermögen. Es stellt sich vor allem die Frage, ob bei gewissen Gestaltungen nicht ein bestehender Gesamtplan der Inanspruchnahme steuerlicher Vergünstigungen entgegensteht, wenn nicht der gesamte Mitunternehmeranteil einschließlich Sonderbetriebsvermögen übertragen worden ist. Hier könnten schnell die tarifbegünstigte Besteuerung bei einer Veräußerung bzw. die Buchwertfortführung bei Umwandlungen "auf der Kippe stehen". KW - entgeltliche Übertragung von Anteilen an Personengesellschaften; Sonderbetriebsvermögen; Gesamtplan; tarifbegünstigte Besteuerung bei Veräußerung; Umwandlungen; Buchwertfortführung; KW - Personengesellschaft KW - Sonderbetriebsvermögen KW - Unternehmernachfolge KW - Steuerrecht Y1 - 2013 VL - 2013 IS - 06 SP - 200 EP - 205 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die unentgeltliche Übertragung von Anteilen an Personengesellschaften im Sonder-BV JF - Gestaltende Steuerberatung N2 - Im Wege der vorweggenommenen Erbfolge kommt es häufig zu unentgeltlichen Übertragungen von Mitunternehmeranteilen mit Sonderbetriebsvermögen. Welche Gestaltungsmöglichkeiten in diesem Bereich bestehen und in welchen Fällen die Aufdeckung stiller Reserven vermieden werden kann, wird in dem Beitrag untersucht. Es stellt sich - wie auch bei entgeltliche Übertragungen - vor allem die Frage, ob nicht ein bestehender "Gesamtplan" schädlich ist, wenn nicht der gesamte Mitunternehmeranteil einschließlich Sonderbetriebsvermögen übertragen worden ist. KW - unentgeltliche Übertragung von Anteilen an Personengesellschaften; Sonderbetriebsvermögen; Gesamtplan; vorweggenommene Erbfolge; Gestaltungsmöglichkeiten; Vermeidung Aufdeckung stiller Reserven; KW - Vorweggenommene Erbfolge KW - Personengesellschaft KW - Sonderbetriebsvermögen KW - Unternehmernachfolge Y1 - 2013 VL - 2013 IS - 09 SP - 299 EP - 304 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Unentgeltliche Übertragung eines Kommanditanteils: Gesamtplan als Gefahr für die Buchwertfortführung? JF - Gestaltende Steuerberatung N2 - Der BFH hat jüngst in einem hochinteressanten Urteil die Voraussetzungen der unentgeltlichen Übertragung eines Mitunternehmeranteils zu Buchwerten nach § 6 Abs. 3 EStG präzisiert. Interessant ist, dass die höchstrichterliche Entscheidung auch eine Klarstellung zur Gesamtplanrechtsprechung beinhaltet (BFH 9.12.14, IV R 29/14). KW - unentgeltliche Übertragung eines Kommanditanteils; Buchwertfortführung; Gesamtplanrechtsprechung; BFH; KW - Kommanditgesellschaft KW - Unentgeltliche Übertragung Y1 - 2015 VL - 2015 IS - 09 SP - 332 EP - 334 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Die Immo-Glück KG: Bessere Verlustverrechnung bei einer vermögensverwaltenden KG möglich JF - Gestaltende Steuerberatung N2 - Dieser praktische Fall beschäftigt sich mit der Verrechnung von nicht ausgeglichenen oder abgezogenen Verlusten eines inländischen Kommanditisten, der an einer vermögensverwaltenden KG beteiligt ist. Der BFH hatte jüngst die Möglichkeiten der Verlustverrechnung gemäß § 15a EStG Abs. 2 i.V.m. § 21 Abs. 1 S. 2 EStG präzisiert und deutlich verbessert (BFH 2.9.14, IX R 52/13, GStB 15, 158). Dieses Potential sollte man nutzen. KW - § 15a EStG; Verlustverrechnung; Kommanditist; vermögensverwaltende KG; praktischer Fall; KW - Kommanditgesellschaft KW - Verlustverlagerung Y1 - 2015 VL - 2015 IS - 10 SP - 377 EP - 380 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Nießbrauch an Grundstücken des Privatvermögens: Gestaltungsempfehlungen aus steuerlicher Sicht JF - Erbfolgebesteuerung N2 - Häufig erfolgt die Vereinbarung eines Nießbrauchs an Grundstücken des Privatvermögens aus familiären Gründen, insbesondere im Rahmen der vorweggenommenen Erbfolge oder anläßlich einer Erbregelung. Motivation für die Bestellung eines Nießbrauchs kann aber auch das Ziel der Einkünfteverlagerung auf minderjährige Kinder sein, um die einkommensteuerliche Belastung zu reduzieren. Doch bei allen Gestaltungsvarianten, die bei der Bestellung des Nießbrauchs zivilrechtlich möglich sind, müssen zwingend die steuerlichen Folgen bedacht werden, um nachteilige Folgen zu vermeiden. KW - Nießbrauch an Grundstücken des Privatvermögens KW - Nießbrauch KW - Grundstücksübertragung KW - Vorweggenommene Erbfolge KW - Steuerrecht KW - Gestaltungsempfehlungen Y1 - 2020 VL - 2020 IS - 10 SP - 265 EP - 270 ER - TY - JOUR A1 - Butz-Seidl, Annemarie T1 - Keine Erbschaftsteuerverschonung für die Betreiber von Parkhäusern - oder vielleicht doch? JF - Erbfolgebesteuerung N2 - Nach der Mitte 2016 in Kraft getretenen Erbschaftsteuerreform soll Verwaltungsvermögen nicht mehr an einer erbschaftssteuerlichen Verschonung teilhaben (vgl. § 13b Abs. 2 ErbStG). Liegt bei einem Betreiber eines Parkhauses, dessen Kerngeschäft die Vermietung von Parkplätzen ist, nun in vollem Umfang Verwaltungsvermögen vor, sodass eine Erbschaftsteuerverschonung ausscheidet? KW - Erbschaftsteuerrecht KW - Erbschaftsteuerrecht KW - Reform KW - Parkhaus KW - Verwaltungsvermögen Y1 - 2020 VL - 2020 IS - 07 SP - 179 EP - 181 ER - TY - CHAP A1 - Rötzel, Peter A1 - Weber, Maximilian T1 - Bridging organizational resilience and management control systems - a systematic review T2 - Annual Conference of the European Accounting Association N2 - Organizations have repeatedly faced challenges due to (natural) disasters such as pandemics, economic or financial crises, and unexpected events. One reason why some firms cope more efficiently with such unexpected events than others has long been the subject of research, might be found in their resilience design. However, there is still no consensus in the literature and there is no common understanding of the definitions, the conceptualizations of resilience at the organizational level, and the interaction with management control systems (MCS). This study bridges MCS and resilience literature and provides a broader understanding of the relationship between the organization and adversity. Due to its ability to successfully control an organization and provide an effective control environment, we use Simons’ levers of control framework (LOC) as framework for integrating organizational resilience into MCS. We perform a systematic reviewing of analytical conceptualizations and definitions of management control systems (levers of control) and organizational resilience, supplemented by current empirical findings. Based on literature, we provide a framework which integrates organizational resilience into management control systems. Our findings show that the integration of resilience aspects into MCS enables firms to manage resilience at the organizational level. KW - Organizational resilience KW - Management control systems KW - Levers of Control KW - Systematic Review KW - Resilience KW - Management KW - Kontrollsystem Y1 - 2021 ER - TY - CHAP A1 - Rötzel, Peter A1 - Smeets, Mario A1 - Osterndorf, Ralf T1 - RPA for the Financial Industry Particular challenges and outstanding suitability combined T2 - Robotic Process Automation N2 - Like many service industries, the financial industry is largely characterized by administrative and back-office processes and distinguished by a broad systems landscape with a high proportion of legacy systems. Missing interfaces between Information Systems, User Interfaces or Web Applica-tions often require many manual activities. As banks are often functionally organized into traditional departments, a process-oriented organizational structure is rarely in place. The financial industry therefore offers enormous potential for the use of Robotic Process Automation (RPA) and the rais-ing of potential benefits such as process-related cost savings, time reductions and quality im-provements. The aim of this chapter is to describe the tremendous opportunities that the use of RPA technology offers to the financial industry and to explain how these opportunities can be realized. Therefore, we start by explaining the challenges that progressive digitalization poses to the industry and how RPA, but also more advanced technologies (that work not only rule-based but also define own rules), such as Artificial Intelligence (AI), can help to overcome them. As well as providing an over-view of the various applications of RPA in the financial industry, we also provide a comprehensive case study of a relevant practical application. KW - Robot Process Automation KW - Artificial Intelligence KW - Finance KW - Accouting KW - Legacy systems KW - Finanzdienstleistungsinstitut KW - Automation KW - Digitalisierung Y1 - 2021 PB - De Gruyter CY - Amsterdam ER - TY - CHAP A1 - Böhmer, Cornelia A1 - Feldmann, Nina A1 - Ibsen, Michael T1 - E-exams in engineering education — online testing of engineering competencies: Experiences and lessons learned T2 - 2018 IEEE Global Engineering Education Conference (EDUCON), Santa Cruz de Tenerife, Spain KW - Ingenieurstudium KW - Computerunterstütztes Lernen KW - Prüfung Y1 - 2018 U6 - https://doi.org/10.1109/EDUCON.2018.8363281 SP - 571 EP - 576 ER - TY - CHAP A1 - Stroß, Markus A1 - Kugler, Gabriela A1 - Schibelbein, Alina A1 - Feldmann, Nina A1 - Böhmer, Cornelia A1 - Beck-Meuth, Eva-Maria T1 - Lecturers’ Views on E-Learning in an Engineering Study Program for Non-traditional Students. An Online Survey. KW - E-Learning KW - Teilstudium KW - Berufstätiger KW - Ingenieurstudium Y1 - 2017 U6 - https://doi.org/10.1109/EDUCON.2017.7942886 SN - 2165-9567 SP - 453 EP - 457 PB - IEEE Global Engineering Education Conference (EDUCON) CY - Athen ER - TY - CHAP A1 - Schibelbein, Alina A1 - Ibsen, Michael A1 - Böhmer, Cornelia A1 - Feldmann, Nina A1 - Stroß, Markus A1 - Beck-Meuth, Eva-Maria T1 - Elektronische Prüfungsformate für berufsbegleitend Studierende, Erprobung im Mathematik-Vorkurs an der Hochschule Aschaffenburg BT - kompetenzorientiertes Lehren, Lernen und Prüfen T2 - Teaching is Touching the Future & ePS 2016 KW - Teilstudium KW - Berufstätiger KW - Mathematik Y1 - 2017 SP - 149 EP - 152 PB - Webler CY - Bielefeld ER - TY - CHAP A1 - Mußenbrock, Konrad A1 - Stroß, Markus A1 - Schibelbein, Alina A1 - Böhmer, Cornelia A1 - Feldmann, Nina A1 - Hojas, David A1 - Beck-Meuth, Eva-Maria T1 - Participatory Development of a Bachelor’s Degree Program in Industrial Engineering for Non-traditional Students BT - Proceedings of the 19th ICL Conference - Volume 1 T2 - Interactive Collaborative Learning KW - Wirtschaftsingenieurwissenschaftliches Studium KW - Teilstudium KW - Berufstätiger Y1 - 2017 SP - 600 EP - 608 PB - Springer ER - TY - CHAP A1 - Beck-Meuth, Eva-Maria A1 - Mußenbrock, Konrad A1 - Hojas, David T1 - Konzeption eines berufsbegleitenden Bachelor of Engineering mit Anrechnung T2 - Tagungsband zum 3. Symposium zur Hochschullehre in den MINT-Fächern, 25.-26.09.17 KW - Teilstudium KW - Berufstätiger KW - Studiengang Elektro- und Informationstechnik (berufsbegleitend) Y1 - 2017 SN - 1612 – 4537 PB - B. Meissner, C. Walter & B. Zinger CY - Nürnberg ER - TY - JOUR A1 - Zettl, Julian A1 - Klar, Maximilian A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Generation of Rotationally Symmetric Micro Tools using Ultrashort Laser Pulses JF - Journal of Laser Micro/Nanoengeneering N2 - We report on the fabrication of rotationally symmetrical geometries with ultrashort laser pulses impinging the constant rotating workpiece tangentially. This particular micro machin-ing of geometry is referred to as laser turning, upon which the laser beam is, in general, orient-ed perpendicularly to the rotational axis and tangentially to the work piece. The target geome-try is realized by moving the constantly rotating specimen according to the specified geometry along the focused laser spot. In contrast to mechanical turning, laser turning induces a mini-mized amount of lateral forces through friction that might deteriorate the geometry. In this study, laser turning is examined for stellite as a function of pulse energy and pulse length in the range between 240 fs and 10 ps. Shorter pulse lengths and higher pulse energies increase the achievable ablation rate, while in the pulse length regime of below 1 ps lower roughness is achieved. With a maximum ablation rate of 1.27 mm³/min and a minimum roughness of 0.17 µm, laser turning combines both, fast processing and high surface quality. KW - Ultrakurzzeitlaser Y1 - 2020 U6 - https://doi.org/10.2961/jlmn.2020.02.2007 VL - 15 IS - 2 SP - 118 EP - 122 ER - TY - GEN A1 - Doll, Konrad A1 - Köhler, Sebastian A1 - Goldhammer, Michael A1 - Brunsmann, Ulrich T1 - Pedestrian Movement Modelling and Trajectory Prediction at Urban Intersections T2 - International IEEE Conference on Intelligent Transportation Systems (ITSC 2015) N2 - Vortrag KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2015 CY - Las Palmas de Gran Canaria, Spain ER - TY - JOUR A1 - Kröhn, Michael A1 - Reuter, Norbert A1 - Hahnle, Michael A1 - Prochus, Tobias A1 - Doll, Konrad T1 - Gestengesteuerte Prozessanalyse JF - atp edition - Automatisierungstechnische Praxis KW - Prozessanalyse Y1 - 2016 VL - 58 IS - 12 SP - 26 EP - 33 ER - TY - CHAP A1 - Hubert, Andreas A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Cyclists starting behavior at intersections T2 - 2017 IEEE Intelligent Vehicles Symposium (IV) KW - Fahrerassistenzsystem KW - Radfahrer Y1 - 2017 U6 - https://doi.org/10.1109/IVS.2017.7995856 SP - 1071 EP - 1077 PB - IEEE CY - Los Angeles, CA, USA ER - TY - CHAP A1 - Eilbrecht, Jan A1 - Bieshaar, Maarten A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard A1 - Stursberg, Olaf T1 - Model-predictive planning for autonomous vehicles anticipating intentions of vulnerable road users by artificial neural networks T2 - 2017 IEEE Symposium Series on Computational Intelligence (SSCI) KW - Fahrerassistenzsystem KW - Fußgänger KW - Radfahrer KW - Autonomes Fahrzeug Y1 - 2017 U6 - https://doi.org/10.1109/SSCI.2017.8285249 SP - 1 EP - 8 PB - IEEE CY - Honolulu, HI, USA ER - TY - CHAP A1 - Bieshaar, Maarten A1 - Zernetsch, Stefan A1 - Depping, Malte A1 - Sick, Bernhard A1 - Doll, Konrad T1 - Cooperative Starting Intention Detection of Cyclists based on Smart Devices and Infrastructure T2 - 2017 IEEE 20th International Conference on Intelligent Transportation Systems (ITSC) KW - Fahrerassistenzsystem KW - Radfahrer Y1 - 2017 U6 - https://doi.org/10.1109/ITSC.2017.8317691 SP - 1 EP - 8 PB - IEEE CY - Yokohama, Japan ER - TY - CHAP A1 - Bieshaar, Maarten A1 - Reitberger, Günther A1 - Kreß, Viktor A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Fuchs, Erich A1 - Sick, Bernhard T1 - Highly Automated Learning for Improved Active Safety of Vulnerable Road Users T2 - ACM Chapters Computer Science in Cars Symposium (CSCS-17) KW - Fahrerassistenzsystem Y1 - 2017 VL - 2017 CY - München ER - TY - CHAP A1 - Krause, Dennis A1 - Stahl-Offergeld, Markus A1 - Sand, Markus A1 - Hohe, Hans-Peter A1 - Kovacs, Günter T1 - CMOS Integrated Field Coils for Self-Calibration of 3D Hall-Sensors T2 - Sensors and Measuring Systems, 19th ITG/GMA-Symposium, 26-27 June 2018 N2 - An integrated arrangement of field coils for on-chip self-calibration is presented. Routine tests for 3D Hall sensors are very complex and need special test hardware to generate a well-defined three-dimensional magnetic field. In combination with a high voltage current source, the integrated arrangement allows the generation of local magnetic fields up to 2 mT. In spite of process variations, the error of each coil's magnetic flux density is less than 1%. Magnetic tests can be done on-chip without need for additional external test equipment. Additionally, a low power mode allows for validity checks and online calibrations during measurements with a small magnetic flux density of 0:2 mT. KW - Magnetspule KW - Selbstkalibrierung Y1 - 2018 SN - 978-3-8007-4683-5 VL - 2018 PB - IEEE ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Manufacturing of optical elements by non-contact laser processing T2 - Seventh European Seminar on Precision Optics Manufacturing, Proceedings KW - Laserbearbeitung KW - Optisches Bauelement Y1 - 2020 IS - 11478 ER - TY - JOUR A1 - Schwarz, Simon A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fabrication and evaluation of negative axicons for ultrashort pulsed laser applications JF - Optics Express KW - Ultrakurzzeitlaser Y1 - 2020 VL - Optics Express IS - 28 SP - 26207 EP - 26217 ER - TY - JOUR A1 - Kefer, Stefan A1 - Sauer, Theresia A1 - Hessler, Steffen A1 - Kaloudis, Michael A1 - Hellmann, Ralf T1 - Microstructure-Based Fiber-to-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications JF - Sensors (Basel) N2 - This article proposes and demonstrates a robust microstructure-based fiber-to-chip coupling scheme for planar Bragg grating devices. A polymer planar Bragg grating substrate is manufactured and microstructured by means of a micromilling process, while the respective photonic structures are generated by employing a sophisticated single-writing UV-exposure method. A stripped standard single mode fiber is inserted into the microstructure, which is filled with a UV-curable adhesive, and aligned with the integrated waveguide. After curing, final sensor assembly and thermal treatment, the proposed coupling scheme is capable of withstanding pressures up to 10 bar, at room temperature, and pressures up to 7.5 bar at an elevated temperature of 120 °C. Additionally, the coupling scheme is exceedingly robust towards tensile forces, limited only by the tensile strength of the employed single mode fiber. Due to its outstanding robustness, the coupling scheme enables the application of planar Bragg grating devices in harsh environments. This fact is underlined by integrating a microstructure-coupled photonic device into the center of a commercial-grade carbon fiber-reinforced polymer specimen. After its integration, the polymer-based Bragg grating sensor still exhibits a reflection peak with a dynamic range of 24 dB, and can thus be employed for sensing purposes. KW - Bragg grating sensors KW - cyclic olefin copolymers KW - fiber-to-chip coupling KW - microstructures KW - micromilling Y1 - 2020 UR - https://www.mdpi.com/1424-8220/20/19/5452/htm U6 - https://doi.org/10.3390/s20195452 VL - 20 IS - 19 SP - 5452 EP - 5452 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Haubner, Julian A1 - Kefer, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fs-laser based hybrid micromachining for polymer micro-opto electrical systems JF - Optics and Lasers in Engineering N2 - We report on femtosecond laser direct writing of electrically conductive copper structures on transparent cyclic olefin copolymer based planar optical chips. The process is based on a laser-induced reduction of CuO nanoparticles dissolved in a water-soluble resin. Thus generated conductive copper structures are characterized with respect to their chemical composition and electrical resistivity. In addition, the application of ultrashort laser pulses enables a hybrid micromachining approach comprising ablation of polymer substrates and the fabrication of copper patterns in a single laser processing setup. A possible electro-optical application of this approach is demonstrated by employing the copper structures as an electro-thermal microheater in combination with a polymer planar optical Bragg grating sensor. This, in turn, highlights the potential of generating copious micro-opto-electro-mechanical polymer structures for numerous sensing applications ranging from Lab-on-Chip to environmental applications using the presented hybrid micromachining approach. KW - Femtosekundenlaser KW - Bragg-Reflektor Y1 - 2020 U6 - https://doi.org/10.1016/j.optlaseng.2020.106362 VL - 137 IS - 10362 SP - 1 EP - 8 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Hessler, Steffen A1 - Kefer, Stefan A1 - Girschikofsky, Maiko A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Femtosecond laser inscription of waveguides and Bragg gratings in transparent cyclic olefin copolymers JF - Optics Express N2 - We report on a femtosecond laser based fabrication technique that enables simultaneous single-step generation of optical waveguides and Bragg gratings inside bulk cyclic olefin copolymers. Due to the nonlinear absorption of focused and spatially modulated laser radiation with a wavelength of 514 nm and a pulse duration of 450 fs, a modification concluding a refractive index shift increase inside the substrate can be achieved. A sophisticated characterization of the generated waveguides by means of an elaborate cut-back method reveals a maximum attenuation of 3.2 dB/cm. Additionally, a Mach-Zehnder interferometer is used to examine the waveguide’s refractive index profile. The integrated Bragg grating structures exhibit reflectivities up to 95 % and a spectral full width at half maximum of 288 pm, at a Bragg wavelength of 1582 nm, whereas the grating period can be deliberately chosen by adapting the fabrication parameters. Thus, due to its increased flexibility and the resulting dispensability of cost-intensive phase masks, this method constitutes an especially promising fabrication process for polymer Bragg gratings inside of bulk materials. KW - Femtosekundenlaser KW - Wellenleiter KW - Bragg-Reflektor Y1 - 2020 U6 - https://doi.org/10.1364/OE.388364 VL - 28 IS - 12 SP - 18077 EP - 18084 ER - TY - JOUR A1 - Lieb, Florian A1 - Boskamp, Tobias A1 - Stark, Hans-Georg T1 - Peak detection for MALDI mass spectrometry imaging data using sparse frame multipliers JF - Journal of Proteomics N2 - MALDI mass spectrometry imaging (MALDI MSI) is a spatially resolved analytical tool for biological tissue analysis by measuring mass-to-charge ratios of ionized molecules. With increasing spatial and mass resolution of MALDI MSI data, appropriate data analysis and interpretation is getting more and more challenging. A reliable separation of important peaks from noise (aka peak detection) is a prerequisite for many subsequent processing steps and should be as accurate as possible. We propose a novel peak detection algorithm based on sparse frame multipliers, which can be applied to raw MALDI MSI data without prior preprocessing. The accuracy is evaluated on a simulated data set in comparison with state-of-the-art algorithms. These results also show the proposed method's robustness to baseline and noise effects. In addition, the method is evaluated on real MALDI-TOF data sets, whereby spatial information can be included in the peak picking process. Significance: The field of proteomics, in particular MALDI Imaging, encompasses huge amounts of data. The processing and preprocessing of this data in order to segment or classify spatial structures of certain peptides or isotope patterns can hence be cumbersome and includes several independent processing steps. In this work, we propose a simple peak-picking algorithm to quickly analyze large raw MALDI Imaging data sets, which has a better sensitivity than current state-of-the-art algorithms. Further, it is possible to get an overall overview of the entire data set showing the most significant and spatially localized peptide structures and, hence, contributes all data driven evaluation of MALDI Imaging data. KW - MALDI imaging, Peak picking, Frame multiplier KW - MALDI-MS KW - Massenspektrometrie Y1 - 2020 UR - https://doi.org/10.1016/j.jprot.2020.103852 U6 - https://doi.org/https://doi.org/10.1016/j.jprot.2020.103852 VL - 2020 IS - 225 SP - 103852 EP - 103860 ER - TY - RPRT A1 - Schmitt, Joachim T1 - Digitaler Wandel – Einsichten in aktuelle Phänomene N2 - Das Thema „Digitaler Wandel“ ist umfassend und vielfältig. Entsprechend bedarf es der multiperspektivischen Erörterung, was die Leitung des Information Management Instituts (IMI) dazu motivierte, das Format einer Ringvorlesung an der TH Aschaffenburg anzugehen. Damit ist es im Wintersemester 2019/2020 gelungen, ein ganzes Portfolio von Sichtweisen über das Themengebiet darzulegen. Neben Professoren der TH Aschaffenburg waren auch externe Referenten involviert. Die Ringvorlesung war sowohl Studierenden der Hochschule, im Rahmen eines Wahlfachs, als auch der allgemeinen Öffentlichkeit zugänglich. Für den Hochschulstandort Aschaffenburg war dies die erste Ringvorlesung. KW - Ringvorlesung KW - Digitalisierung Y1 - 2020 PB - IMI Verlag CY - Aschaffenburg ER - TY - RPRT A1 - Hofmann, Georg Rainer A1 - Schumacher, Meike A1 - Hartlaub, Peter A1 - Scheidler, Percy A1 - Schmitt, Joachim A1 - Falkenberg, Lucia T1 - Digital. Konzertiert. Aktiv - Die Transformation der Arbeitswelt gemeinsam gestalten N2 - Der vorliegende Text basiert einerseits auf den Ergebnissen von studentischen Arbeiten, welche im Sommersemester 2018 und im Wintersemester 2018/2019 am IMI erstellt wurden. Weiter trafen sich die Autoren Prof. Dr. Georg Rainer Hofmann und Meike Schumacher (beide TH Aschaffenburg) über ein Jahr ca. alle zwei Monate zu jeweils zweistündigen Gesprächen mit Vertretern der KAB (Herr Joachim Schmitt, Herr Peter Hartlaub) und der IG Metall (Herr Percy Scheidler, Frau Manuela Lüft, Herr Simon Kruppa), sowie Herr Rudi Grossmann, ehemaliger Kreisvorsitzender des Deutschen Gewerkschaftsbundes (DGB), der auch Mitglied der KAB ist. Es wurden in diesen Gesprächen eine Vielzahl von Erkenntnissen und Perspektiven zum Thema der „Neuen Arbeitswelt“ identifiziert. Frau Lucia Falkenberg, Chief People Officer (CPO) und Leiterin der Kompetenzgruppe New Work des eco – Verband der Internetwirtschaft e. V. vertritt in der vorliegenden Studie die Perspektive der Arbeitgeber in der Digitalen Transformation (Kap. 2.4); die Arbeitgeber haben das Problem der hinreichenden Attraktivität ihrer Unternehmen bei der Gewinnung qualifizierter Fachkräfte zu gegenwärtigen. Die Beteiligten fanden diese neuen Aspekte – insbesondere weil sie aus verschiedenen Bereichen des Bemühens um eine Humanisierung der Arbeitswelt stammen – einer Dokumentation wert. Aus diesem Grund wurde eine Ausarbeitung – als Diskussionsangebot und -beitrag – vorgenommen, in die sowohl die veränderten Rahmenbedingungen der Arbeitswelt, als auch einige Überlegungen zu politischen Handlungsoptionen geflossen sind. KW - Arbeit KW - Digitalisierung Y1 - 2019 PB - IMI Verlag CY - Aschaffenburg ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Diethelm, Ira A1 - Abke, Jörg T1 - A Mixed Methods Research Agenda to Identify Undergraduate Misconceptions in Software Engineering, Lecturers' Handling, and Didactical Implications T2 - In Proceedings of the 2020 IEEE/ACM 42nd International Conference on Software Engineering (ICSE) KW - Hochschuldidaktik KW - Software Engineering Y1 - 2020 SN - ISBN 978-1-4503-7121-6 VL - 2020 SP - 256 EP - 257 ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Borgeest, Kai A1 - Reuter, Rebecca A1 - Jahn, Sabrina A1 - Mottok, Jürgen A1 - Sedelmaier, Yvonne A1 - Lehmann, Alexander A1 - Landes, Dieter T1 - Totally Different and yet so Alike – Three Concepts to Use Scrum in Higher Education T2 - ECSEE '20: European Conference on Software Engineering Education KW - Hochschuldidaktik KW - Software Engineering Y1 - 2020 SN - ISBN 78-1-4503-7752-2 VL - 2020 SP - 12 EP - 21 ER - TY - RPRT A1 - Hartmann, Kilian T1 - Einsatz derivativer instrumente für die Integration erneuerbarer Energien in bestehende Strommärkte N2 - Die aktuellen politischen Maßnahmen zur Integration erneuerbarer Energien in den Strommarkt sind ineffizient und teuer, gleichzeitig schädigen sie den bestehenden Markt. Mittels der Kombi-nation fluktuierender und regelbarer erneuerbarer Energien in Kombikraftwerken und der Ver-marktung der Leistung als Derivat am Terminmarkt kann der Spotmarkt entlastet werden. In der Folge reduziert sich die EEG-Umlage und erneuerbare Energien können als gesicherte Leistung im Markt zur Verfügung gestellt werden. Im folgenden Beitrag soll ein organisatorischer Ansatz für die Integration erneuerbarer Energien in den Strommarkt aufgezeigt werden, der den Ausbau der erneuerbaren Energien unter marktwirt-schaftlichen Aspekten ermöglicht, die Versorgungssicherheit gewährleistet und dem bestehenden Kraftwerkspark einen geordneten Umbau hin zu einem flexiblen System ermöglicht. (2) (PDF) Einsatz derivativer Instrumente für die Integration erneuerbarer Energien in bestehende Strommärkte. Available from: https://www.researchgate.net/publication/317580615_Einsatz_derivativer_Instrumente_fur_die_Integration_erneuerbarer_Energien_in_bestehende_Strommarkte. KW - Erneuerbare Energien KW - Marktintegration KW - Terminmarkt KW - Energiemarkt KW - Erneuerbare Energien Y1 - 2017 UR - https://www.researchgate.net/publication/317580615_Einsatz_derivativer_Instrumente_fur_die_Integration_erneuerbarer_Energien_in_bestehende_Strommarkte U6 - https://doi.org/10.13140/RG.2.2.36571.36645 ER - TY - JOUR A1 - Candra, Dodiek Ika A1 - Hartmann, Kilian A1 - Nelles, Michael T1 - Economic Optimal Implementation of Virtual Power Plants in the German Power Market JF - MDPI energies N2 - The burden of excess energy from the high renewable energy sources (RES) share creates a significant reduction of residual load for the future, resulting in reduced market prices. The higher the share of stochastic RES, the more often the price will be 0 €/MWh. The power market needs new methods to solve these problems. The development of virtual power plants (VPPs) is aimed at solving techno-economic problems with an increasing share of RES in the power market. This study analyses a possible implementation of stochastic and deterministic RES in a VPP to generate secured power, which can be implemented in the European Power Exchange (EPEX)/European Energy Exchange (EEX) power market using existing market products. In this study, the optimal economic VPP configuration for an RES-based power plant is investigated and implemented into standard power market products. The results show that the optimal economic VPP configuration for different market products varies, depending on the energy availability and the marginal costs of the VPP components. The size of the VPP components is positively correlated to the components’ share of the energy generated. It was also found that projecting or implementing VPPs in Germany at current market prices (EPEX/EEX prices) is not yet economically feasible for a small share of market products. However, the secured power can be marketed on the SPOT and in the futures market with higher and more stable prices compared with the status quo. KW - VPP; marketing; configuration; energy transition; power market; EPEX; EEX; power market products KW - Elektrizitätsmarkt KW - Virtuelles Kraftwerk Y1 - 2018 UR - https://www.mdpi.com/1996-1073/11/9/2365 U6 - https://doi.org/10.3390/en11092365 VL - 11 IS - 11/09 SP - 2365 EP - 2373 ER - TY - BOOK A1 - Borgeest, Kai T1 - Messtechnik und Prüfstände für Verbrennungsmotoren KW - Verbrennungsmotor KW - Prüfstand KW - Messtechnik Y1 - 2020 SN - 0000-0003-4289-0083 U6 - https://doi.org/10.1007/978-3-658-29105-1 VL - 2020 PB - Springer-Vieweg CY - Wiesbaden ET - 2. Auflage ER - TY - JOUR A1 - Krüger, Malte T1 - Multilateral interchange fees: Don’t throw the baby out with the bathwater JF - Journal of Payments Strategy & Systems N2 - When it comes to multilateral interchange fees (MIFs), the regulatory authorities are demonstrably inconsistent. At the same time as (erroneously) treating them like conventional cartel prices, they have also mandated an upper ceiling for them — effectively legitimising the concept. As this paper demonstrates, classifying MIFs with standard cartel pricing is a categorical error. A capped MIF is simply one ingredient of a well-functioning card payment system. Indeed, without MIFs, payments markets suffer free-rider problems and high transaction costs. To illustrate how MIFs curtail the tendency of prices to move upward, the paper examines the German ATM system before 2011. Finally, the paper argues that the current regulatory approach may lead to the demise of those European card schemes that are currently under pressure from MasterCard and Visa. KW - multilateral interchange fees, card payment systems, competition policy, European card scheme, two-sided markets, interchange fee regulation KW - Kreditkartengeschäft Y1 - 2019 VL - 13 IS - 2 SP - 138 EP - 150 ER - TY - JOUR A1 - Goldhammer, Michael A1 - Köhler, Sebastian A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard A1 - Dietmayer, Klaus T1 - Intentions of Vulnerable Road Users – Detection and Forecasting by Means of Machine Learning JF - IEEE Transactions on Intelligent Transportation Systems KW - Fahrerassistenzsystem KW - Fußgänger KW - Radfahrer Y1 - 2019 UR - https://doi.org/10.1109/TITS.2019.2923319 U6 - https://doi.org/10.1109/TITS.2019.2923319 VL - 2020 IS - 21 / 7 SP - 3035 EP - 3045 ER - TY - GEN A1 - Kefer, Stefan A1 - Dai, Jixiang A1 - Yang, Minghong A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Hypersensitive H2 sensor based on polymer planar Bragg gratings coated with Pt-loaded WO3–SiO2: erratum N2 - We present an erratum to our Letter [Opt. Lett. 45, 3601 (2020)]. Labeling errors in two figures and an incorrect sentence are revised. The corrections have no influence on the conclusions of the original Letter. N2 - Erratum KW - Bragg Grating, Hydrogen Detection, Functionalization KW - Gassensor KW - Wasserstoff KW - Bragg-Reflektor Y1 - 2020 UR - https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-16-4498 U6 - https://doi.org/https://doi.org/10.1364/OL.401819 VL - 45 IS - 16 SP - 4498 EP - 4498 ER - TY - THES A1 - Körbitzer, Berit Silke T1 - Untersuchung funktioneller Schnittstellen zwischen Graphen und neuronalen Zellen KW - Mikroelektrode KW - Array KW - Graphen KW - Elektrode Y1 - 2019 U6 - https://doi.org/10.25534/tuprints-00011462 ER - TY - THES A1 - Emmerich, Florian T1 - Eigenschaften und Anwendungen von Dünnschicht-Elektretmaterialien KW - Dünnschichttechnik KW - Elektret Y1 - 2020 U6 - https://doi.org/10.25534/tuprints-00012056 ER - TY - CHAP A1 - Niekamp, Linus A1 - Döhring, Thorsten A1 - Rees, Paul A1 - Hudec, Rene T1 - Technologies, challenges and opportunities for optical CubeSat payloads T2 - DGaO Proceedings N2 - This contribution describes optical payloads of CubeSat nanosatellites and their limiting factors. Some prominent examples are presented, and performance characteristics are discussed in the context of different commercial and scientific applications. Furthermore, the optical payload market has been evaluated and identified suppliers of commercial-of-the-shelf products are listed. KW - CubeSat KW - payload KW - satellite KW - Optik KW - Kleinsatellit Y1 - 2020 UR - https://www.dgao-proceedings.de/download/121/121_p30.pdf SN - 1614-8436 VL - 2020 IS - 2020 SP - 1 EP - 2 PB - Deutsche Gesellschaft für angewandte Optik ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stritzelberger, Carolyn A1 - Rosendahl, Wilfried A1 - Busch, Uwe T1 - Forschungsstation an der TH Aschaffenburg – Schülerexperimente im Röntgen-Jubiläumsjahr T2 - DGaO Proceedings N2 - Deutschland begeht 2020 das Röntgenjahr und feiert damit die Entdeckung der Röntgenstrahlen vor 125 Jahren. Ein Sprinter mit interaktiven Experimenten für Kinder und Jugendliche sollte hierzu im Jubiläumsjahr deutschlandweit unterwegs sein. Die eingeplante Station des „X-perimente“-Mobils an der TH Aschaffenburg konnte wegen der Corona-Pandemie leider noch nicht durchgeführt werden. KW - Röntgen KW - Röntgenstrahlung KW - Röntgenjahr KW - X-perimente KW - Röntgenstrahlung KW - Schülerversuch Y1 - 2020 UR - https://www.dgao-proceedings.de/download/121/121_p16.pdf SN - 1614-8436 VL - 2020 IS - 2020 SP - 1 EP - 2 PB - Deutsche Gesellschaft für angewandte Optik e.V. ER - TY - JOUR A1 - Rung, Stefan A1 - Bokan, Kevin A1 - Schwarz, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Influence of laser wavelength on the modification of friction between 100Cr6 steel and polytetrafluoroethylene by femtosecond laser-induced periodic surface structures JF - Journal of Laser Applications KW - Femtosekundenlaser Y1 - 2020 U6 - https://doi.org/10.2351/7.0000036 VL - 32 IS - 3 SP - 032017-1 EP - 032017-6 ER - TY - JOUR A1 - Hartmann, Kilian A1 - Candra, Dodiek Ika A1 - Nelles, Michael T1 - Von einer fluktuierenden zur verlässlichen Stromerzeugung JF - ew Magazin für die Energiewirtschaft N2 - Erneuerbare-Energien-Anlagen speisen ihren Strom bisher vorwiegend fluktuierend in die Stromnetze ein. Durch Kombination dieser fluktuierenden Erzeugung zum Beispiel aus Photovoltaik oder Windenergie mit flexibler Erzeugung aus Biogas in einem virtuellen Kraftwerk können diese Herausforderungen jedoch gelöst werden. Geeignete Technologien und IKT-Infrastrukturen vorausgesetzt, können erneuerbare Energien damit künftig zu einer verlässlichen Stromerzeugung werden. KW - Energiemanagement KW - erneuerbare Energien KW - Erneuerbare Energien KW - Energiemanagement Y1 - 2019 UR - https://emagazin.ew-magazin.de/de/profiles/a21024e15cd4/editions/41fdcbacdbbd41f3c573/pages/page/42 VL - 04/2019 IS - 7655 SP - 42 EP - 44 ER - TY - JOUR A1 - Wilches, Camilo A1 - Nelles, Michael A1 - Hartmann, Kilian T1 - Representative sampling Implementation in Online VFA/TIC Monitoring for Anaerobic Digestion JF - MDPI energies N2 - This paper describes an automatic sampling system for anaerobic reactors that allows taking representative samples following the guidelines of Gy’s (1998) theory of sampling. Due to the high heterogeneity degree in a digester the sampling errors are larger than the analysis error, making representative sampling a prerequisite for successful process control. In our system, samples are automatically processed, generating a higher density of data and avoiding human error by sample manipulation. The combination of a representative sampling system with a commercial automate titration unit generates a robust online monitoring system for biogas plants. The system was successfully implemented in an operating biogas plant to control a feeding-on-demand biogas system. KW - renewable energies KW - biogas KW - process control KW - Erneuerbare Energien KW - Biogas KW - Biogasanlage Y1 - 2019 UR - https://www.mdpi.com/1996-1073/12/6/1179 U6 - https://doi.org/https://doi.org/10.3390/en12061179 VL - 12 IS - 12/06 SP - 1179 EP - 1186 ER - TY - JOUR A1 - Kefer, Stefan A1 - Dai, Jixiang A1 - Yang, Minghong A1 - Schmauss, Bernhard A1 - Hellmann, Ralf T1 - Hypersensitive H2 sensor based on polymer planar Bragg gratings coated with Pt-loaded WO3-SiO2 JF - Optics Letters N2 - This letter demonstrates a novel hydrogen sensor based on a polymer planar Bragg grating coated with Pt-loaded WO3-SiO2. The reflected Bragg signal shows a distinct peak splitting correlated to substrate anisotropies originating from the injection molding process. Especially at low H2 concentrations, both sensing peaks exhibit an outstanding response to the heat generated by the exothermic reaction between hydrogen molecules and coating. Thereby, a hydrogen volume ratio of 50 ppm leads to a Bragg wavelength shift of -37 pm, which yields an outstandingly low detection limit of only 5 ppm H2 in air. Thus, functionalized polymer planar Bragg gratings are eminently suitable for H2 leak detection applications. KW - Bragg Grating Sensors KW - Hydrogen Detection KW - Cyclic Olefin Copolymers KW - Gassensor KW - Wasserstoff KW - Bragg-Reflektor Y1 - 2020 UR - https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-13-3601 U6 - https://doi.org/https://doi.org/10.1364/OL.395341 VL - 45 IS - 13 SP - 3601 EP - 3604 ER - TY - CHAP A1 - Krini, Mohammed A1 - Madhu, Nilesh T1 - Improved F0 Estimation by Generalised Spectral Refinement Applied to DFT-Modulated Polyphase Filterbanks T2 - International Symposium on Embedded Computing and System Design, Amrita Vishwa Vidyapeetham KW - Filterbank KW - Signalverarbeitung Y1 - 2019 SN - 9781728141770 ER - TY - CHAP A1 - Krini, Mohammed A1 - Madhu, Nilesh T1 - Generalized Refinement of Short-Term Fourier Spectra in Time- and Frequency Domain and its Combination with Polyphase Filterbanks T2 - IEEE International Symposium on Signal Processing and Information Technology (ISSPIT'19), Ajman KW - Filterbank KW - Sprachverarbeitung Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Seitz, Christopher A1 - Krini, Mohammed T1 - DNNs versus Codebooks based Spectral Envelope Estimation for Partial Reconstruction of Speech Signals T2 - Workshop on Speech and Audio in the Northeast (SANE’19), New York KW - Sprachverarbeitung KW - Sprachsignal Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Krini, Mohammed A1 - Rachor, Alexander T1 - DFT-Filterbanks with Spectral Refinement and its Comparison with Polyphase Filterbanks T2 - 23rd International Congress on Acoustics (ICA'19), Aachen KW - Filterbank KW - Diskrete Fourier-Transformation Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Seitz, Christopher A1 - Krini, Mohammed T1 - Spectral Envelope Estimation Based on Deep Neural Networks and its use for Speech Reconstruction T2 - 45th German Annual Conference on Acoustics (DAGA’19), Rostock KW - Sprachverarbeitung KW - Neuronales Netz Y1 - 2019 ER - TY - CHAP A1 - Seitz, Christopher A1 - Krini, Mohammed T1 - Schätzung der Spektralen Einhüllenden - Ein Vergleich von Tiefen Neuronalen Netzen und Codebüchern T2 - 20th Electronic Speech Signal Processing Conference (ESSV ’19), Dresden KW - Sprachverarbeitung KW - Neuronales Netz Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Krini, Mohammed A1 - Mirza, Zafar Baig T1 - An Adaptive Beamformer-Postfilter System for Seat belt Microphones and its Efficient Implementation on Sharc ADSP-21489 T2 - 16th IEEE International Workshop on Acoustic Signal Enhancement (IWAENC ’18), Chiyoda, Tokyo KW - Sicherheitsgurt KW - Mikrofon Y1 - 2018 VL - 2018 ER - TY - CHAP A1 - Herbert, Matthias A1 - Mirza, Zafar Baig A1 - Krini, Mohammed T1 - Real-Time Implementation of an Adaptive Beamformer-Postfilter System for Seat belt Microphones on Sharc ADSP-21489 T2 - 44th German Annual Conference on Acoustics (DAGA’18), München KW - Sicherheitsgurt KW - Mikrofon Y1 - 2018 VL - 2018 ER - TY - CHAP A1 - Krini, Mohammed T1 - Refinement Methods as Preprocessing or Postprocessing for Short-Term Spectra Analysis T2 - 19th Electronic Speech Signal Processing Conference (ESSV ’17), Saarbrücken KW - Frequenzanalyse Y1 - 2017 VL - 2017 ER - TY - CHAP A1 - Krini, Mohammed A1 - Mirza, Zafar Baig A1 - Rodemer, Klaus T1 - A Practical Beamformer-Postfilter System for Microphone Arrays on Seat Belts T2 - 12. ITG Symposium Speech Communication (ITG’16), Paderborn KW - Sicherheitsgurt KW - Mikrofon KW - Array Y1 - 2016 VL - 2016 ER - TY - JOUR A1 - Rajan, Vasudev Kandade A1 - Krini, Mohammed A1 - Schmidt, Gerhard T1 - Signal Processing Techniques for Seat Belt Micro-phone Arrays JF - EURASIP Journal on Advances in Signal Processing KW - Signalverarbeitung KW - Sicherheitsgurt KW - Mikrofon KW - Array Y1 - 2016 VL - 2016 ER - TY - CHAP A1 - Klopp, Marco T1 - Work-in-Progress: Learning Culture of Generation Z in Informatics N2 - A new generation of students is entering the university - Generation Z. This generation is characterized mainly by the existing digitization, since they grew up entirely in it. With regard to different generations, the relationship of the different ages and the associated large cohort difference in the interaction between lecturers and learners should be taken into account and analysed. It’s important because, according to the Hattie study, the most important influencing factor for the learning success of learners are the teachers. This means that excellence in teaching (according to the characteristics of the learners) is the most important single factor for the learning outcome. In order to draw the link to Informatics, the consideration of the subject-related culture and the connected learning culture is of central importance. It is obvious to recognize learning cultures in their cultural context, in their reasons and with their consequences for lecturers and students. Frames are therefore not static, but socially constructed and therefore changeable. Learning cultures are created in a communicative negotiation process by all actors in a learning situation. Subject-related culture research also deals with the question of whether and to what extent university teaching differs and which different behaviors can be found among its members. The aim is to classify the Informatics subject-related culture and to describe the ideas and expectations of lecturers and students in the learning environment and in the various social contexts of Informatics, and to reconstruct implicit, practical knowledge for the improvement of learning in Informatics. KW - Generation Geschichte 1995-2010 KW - Lernerfolg KW - Informatikstudium Y1 - 2020 SP - 1589 EP - 1593 PB - IEEE ER - TY - CHAP A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - § 24 Getrennte Rechnungsführung BT - Kommentar T2 - Telekommunikationsgesetz KW - Deutschland Telekommunikationsgesetz 2004 Y1 - 2018 SN - 978-3-406-62086-7 ER - TY - CHAP A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - § 7 Strukturelle Separierung BT - Kommentar T2 - Telekommunikationsgesetz KW - Deutschland Telekommunikationsgesetz 2004 Y1 - 2018 SN - 978-3-406-62086-7 ER - TY - CHAP A1 - Borgeest, Kai T1 - Safe Development Environments for Radiation Tracing Robots T2 - Handbook of Research on Advanced Mechatronic Systems and Intelligent Robotics N2 - Robots can substitute for men in radioactively-contaminated areas. This is a suitable field to deploy robots for measurements, repair, or clearance, but development and test of such robots could be dangerous, because radiation sources need to be handled. To avoid these hazards in development or public demonstrations, safe alternatives to radiation samples have been sought using an already existing robot (EtaBot). One proposed solution is an optical substitution (“light follower”), the other one a fully-digital simulation of the contaminated area and the robot movement inside it using a hardware-in-the-loop simulator (HiL). KW - EtaBot KW - Mobile Robot KW - Mobiler Roboter KW - Künstliche Intelligenz Y1 - 2019 SN - 9781799801375 U6 - https://doi.org/doi.org/10.4018/978-1-7998-0137-5.ch006 SP - 126 EP - 138 PB - IGI Global CY - Hershey, PA ER - TY - CHAP A1 - Rötzel, Peter T1 - Hedonic Prices in the German Market for Mobile Phones T2 - International Telecommunications Conference in association with the 31st EARIE Annual Conference, Berlin, 2-5 September 2004 KW - Mobilfunkmarkt KW - Telekommunikationsmarkt KW - Hedonischer Preis Y1 - 2004 VL - 15 ER - TY - CHAP A1 - Rötzel, Peter A1 - Pedell, Burkhard T1 - Incentive Regulation's Effects on Electricity Companies' Management, Processes, and Organisation: Evidence from the German Electricity Sector T2 - 9th Conference on Applied Infrastructure Research, Berlin, 8-9 October, 2010 KW - Elektrizitätswirtschaft KW - Elektrizitätsversorgungsnetz KW - Regulierung KW - Anreiz Y1 - 2010 ER - TY - CHAP A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - Management Accounting Education in the Public Sector: An Empirical Investigation of Competence Profiles, Assessment of Accounting Tools and Demand for Management Accounting Support T2 - 33rd Annual Congress of the European Accounting Association, Istanbul, 19-21 May 2010 KW - Management Accounting KW - Öffentlicher Sektor Y1 - 2010 ER - TY - CHAP A1 - Rötzel, Peter A1 - Pedell, Burkhard T1 - The Benefit of Management Accounting in Idea Management Systems: Evidence from German Industries T2 - 34 th Annual Congress of the European Accounting Association, Rome-Siena, 20-22 April 2011 KW - Management Accounting KW - Innovationsmanagement Y1 - 2011 ER - TY - CHAP A1 - Rötzel, Peter T1 - Too Much Truth - The Impact of Strategic Information Load T2 - Annual Conference of the International Association for Accouting Education and Research and the Accounting Section of the German Academic Association for Business Research, Frankfurt KW - Rechnungslegung KW - Informationsgehalt Y1 - 2013 ER - TY - BOOK A1 - Rötzel, Peter T1 - Die Regulierung der Qualität im deutschen Stromnetz unter Berücksichtigung von Investitionsanreizen und Transaktionskosten : eine alternative Regulierung durch Zertifikate KW - Elektrizitätsmarkt KW - Elektrizitätsversorgungsnetz KW - Elektrizitätswirtschaft KW - Qualität KW - Regulierung KW - Zertifikat Y1 - 2008 PB - Nomos CY - Baden-Baden ER - TY - CHAP A1 - Fehrenbacher, Dennis A1 - Rötzel, Peter T1 - Enterprise Social Media and Control System Design T2 - 2017 AFAANZ Conference, Melbourne KW - Social Media KW - Rechnungslegung Y1 - 2017 ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - Enterprise Social Media and Control System Design T2 - Proceedings of AAA 2018 Management Accounting Section Midyear Meeting KW - Social Media KW - Management Accounting Y1 - 2018 ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - Enterprise Social Media and Control System Design T2 - 41st Annual Congress of the European Accounting Association, Milan, 30 May - 1 June 2018 KW - Rechnungslegung KW - Social Media Y1 - 2018 ER - TY - CHAP A1 - Rötzel, Peter T1 - Too Much Truth - The Impact of Strategic Information Load T2 - 36 th Annual Congress of the European Accounting Association, Paris, 6-8 May 2013 KW - Rechnungslegung KW - Informationsgehalt Y1 - 2013 ER - TY - CHAP A1 - Hummel, Katrin A1 - Rötzel, Peter T1 - Why the Boss Matters: On the Superior's Influence on Intrinsic and Extrinsic Motivation in Public Service T2 - 36th Annual Congress of the European Accounting Association, Paris, 6-8 May 2013 KW - Öffentlicher Dienst KW - Führungskraft Y1 - 2013 ER - TY - CHAP A1 - Rötzel, Peter A1 - Pedell, Burkhard T1 - Incentive Regulation, Perceived Uncertainty, Investment Behavior, and Coporate Management: Evidence from the German Electricity Sector T2 - 40th EARIE Annual Conference - Évora, Portugal | 30 August – 1 September 2013 KW - Elektrizitätswirtschaft KW - Investitionsverhalten KW - Management Y1 - 2013 ER - TY - CHAP A1 - Rötzel, Peter A1 - Pedell, Burkhard T1 - The Effect of Relative Performance Information on Creative Performance and Effort Allocation in a Multi-Task-Enviroment: Evidence from Experimental Research with Creativity-Based Pay and Real-Time Feedback T2 - ENEAR Conference KW - Leistungslohn Y1 - 2019 ER - TY - CHAP A1 - Hummel, Katrin A1 - Rötzel, Peter T1 - Mandating the Disclosure of Substainability Information in Annual Reports - Evidence from the Companies Act 2006 Regulations 2013 T2 - Annual Congress of the European Accounting Association N2 - This study investigates the sustainability disclosure effects of the introduction of the Companies Act 2006 Regulations 2013 in the United Kingdom. The regulation mandates the disclosure of information on greenhouse gas emissions, gender distribution and human rights issues. We examine two research questions: first, whether firms increased disclosure on the mandated topics after the regulation became effective relative to a control group, and second, whether a potential increase in disclosure is moderated by firms’ reporting incentives, namely, firms’ capital market visibility, growth orientation, governance structure, prior voluntary sustainability disclosure levels and critical media coverage. Our sample consists of the FTSE-350 firms and a matched control group of US firms. We use textual analysis to assess the disclosure of the mandated sustainability topics in firms’ annual reports. Specifically, we examine two types of disclosure, namely, the disclosure of the mandated key performance indicators and the narrative disclosure. Our results reveal a significant increase for both types of disclosure relative to the control group. Overall, this treatment effect tends to be smaller for firms with higher reporting incentives, i.e., reporting incentives mitigate the regulatory effect. Taken together, our results suggest that both standards and reporting incentives shape firms’ sustainability disclosure level. KW - Großbritannien, Companies Act 2006 KW - Bericht KW - Nachhaltigkeit Y1 - 2018 U6 - https://doi.org/10.2139/ssrn.3277478 IS - 41 ER - TY - GEN A1 - Pasckert, Andreas A1 - Rötzel, Peter T1 - "Structure Follows Strategy" - Implikationen und Chancen der SAP S/4HANA-Einführung für die Unternehmensstrategie T2 - ROI Manager KW - SAP S/4HANA Y1 - 2018 UR - https://www.roi.de/roi-dialog/roi-dialog-ausgabe-53/details/news/structure-follows-strategy-2/ ER - TY - JOUR A1 - Rötzel, Peter A1 - Pedell, Burkhard A1 - Groninger, Daniel T1 - Information Load in Escalation Situations - Combustive Agent or Counteractive Measure? JF - Journal of Business Economics, 14 May 2020 N2 - This experimental study analyzes how a key factor, information load, influences decision making in escalation situations, i.e., in situations in which decision makers reinvest further resources in a losing course of action, even when accounting information indicates that the project is performing poorly and should be discontinued. This study synthesizes prior escalation research with information overload and investigates how different levels of information load influence the escalation of commitment. Our findings reveal a U-shaped effect of information load: When decision makers face negative feedback, a higher information load mitigates the escalation tendency up to a certain point. However, beyond this point, more information reinforces the escalation tendency. Moreover, we find that the type of feedback affects self-justification, and we find a negative and significant interaction between information load and self-justification in negative-feedback cases. Thus, studies investigating escalation of commitment should control for self-justification and information load when utilizing high levels of information load. Finally, in the positive-feedback condition, higher information load encourages decision makers to continue promising courses of action, i.e., increases decision-making performance. KW - Informationsüberlastung Y1 - 2020 U6 - https://doi.org/https://doi.org/10.1007/s11573-020-00987-x ER - TY - JOUR A1 - Schleier, Max A1 - Adelmann, Benedikt A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Cross-correlation-based algorithm for monitoring laser cutting with high-power fiber lasers JF - IEEE Sensors Journal KW - Detection algorithm, laser cutting, online monitoring KW - Laserschneiden KW - Hochleistungslaser KW - Faserlaser Y1 - 2017 U6 - https://doi.org/10.1109/JSEN.2017.2783761 VL - 18 IS - 4 SP - 1585 EP - 1590 ER - TY - JOUR A1 - Schleier, Max A1 - Adelmann, Benedikt A1 - Neumeier, Benedikt A1 - Hellmann, Ralf T1 - Burr formation detector for fiber laser cutting based on a photodiode sensor system JF - Optics & Laser Technology KW - Unique sensor; Detection of burr formation; Signal characteristics associated to melt bath dynamics; KW - Laserschneiden KW - Faserlaser Y1 - 2017 U6 - https://doi.org/10.1016/j.optlastec.2017.04.027 VL - 96 IS - - SP - 13 EP - 17 ER - TY - CHAP A1 - Dudutis, Juozas A1 - Pipiras, Jokūbas A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf A1 - Račiukaitis, Gediminas A1 - Gečys, Paulius T1 - Glass cutting by oblate-tip axicon-generated Bessel-Gaussian beams T2 - Open Readings, 63rd International Conference for Students of Physics and Natural Sciences KW - Laserschneiden KW - Glas Y1 - 2019 ER - TY - CHAP A1 - Dudutis, Juozas A1 - Pipiras, Jokūbas A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf A1 - Gečys, Paulius T1 - Bessel beam formation with all laser fabricated axicon - case of glass dicing applications T2 - COLA 2019, 15th International Conference on Laser Ablation KW - Laserbestrahlung Y1 - 2019 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Simulation of process parameters towards the generation of low spatial frequency LIPSS on dielectric materials T2 - MultiScience - XXX. microCAD International Multidisciplinary Scientific Conference KW - Laserbestrahlung KW - Quarzglas Y1 - 2016 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - High quality one-dimensional low spatial frequency LIPSS on sapphire generated by Top-Hat beam shaped ultrashort-pulsed laser T2 - MultiScience - XXXI. microCAD International Multidisciplinary Scientific Conference KW - Ultrakurzzeitlaser Y1 - 2017 ER - TY - CHAP A1 - Schwarz, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Homogeneous low spatial frequency LIPSS on dielectrics generated by beam-shaped femtosecond pulsed laser irradiation T2 - LPM2018 The 19th International Symposium on Laser Precision Microfabrication KW - Femtosekundenlaser Y1 - 2018 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Axicon fabrication with ultrashort and CO2 laser T2 - LPM2018 The 19th International Symposium on Laser Precision Microfabrication KW - Ultrakurzzeitlaser KW - Kohlendioxidlaser Y1 - 2018 ER - TY - CHAP A1 - Schwarz, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - CO2 laser polishing of femtosecond shaped micro-optical components T2 - 3rd Conference on Laser Polishing LaP 2018 KW - Kohlendioxidlaser Y1 - 2018 ER - TY - CHAP A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - All laser-based fabrication of optical elements T2 - Proceedings of SPIE 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX KW - Ultrakurzzeitlaser KW - Kohlendioxidlaser KW - Femtosekundenlaser Y1 - 2020 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Two-Dimensional Low Spatial Frequency Laser-Induced Periodic Surface Structuring of Sapphire JF - Journal of Laser Micro/Nanoengineering KW - Femtosekundenlaser Y1 - 2017 VL - 12 IS - 2 SP - 67 EP - 71 ER - TY - JOUR A1 - Dudutis, Juozas A1 - Pipiras, Jokūbas A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf A1 - Račiukaitis, Gediminas A1 - Gečys, Paulius T1 - Laser-fabricated axicons challenging the conventional optics in glass processing applications JF - Optics Express KW - Laserbearbeitung KW - Quarzglas Y1 - 2020 VL - 28 IS - 4 SP - 5715 EP - 5730 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Surface Plasmon Polariton Triggered Generation of 1D-Low Spatial Frequency LIPSS on Fused Silica JF - Applied Sciences KW - Femtosekundenlaser KW - Quarzglas Y1 - 2018 VL - 8 IS - 9 SP - 1624 EP - 1624 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Rapid fabrication of precise glass axicon arrays by an all laser-based manufacturing technology JF - Journal of Laser Applications KW - Femtosekundenlaser Y1 - 2020 VL - 32 IS - 1 SP - 012001 EP - 012001 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Homogeneous low spatial frequency LIPSS on dielectric materials generated by beam-shaped femtosecond pulsed laser irradiation JF - Journal of Laser Micro/Nanoengineering KW - Femtosekundenlaser Y1 - 2018 VL - 13 IS - 2 SP - 90 EP - 94 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Influence of pulse duration on high-precision manufacturing of 3D geometries JF - Journal of Laser Micro/Nanoengineering KW - Dreidimensionale Geometrie Y1 - 2018 VL - 13 IS - 3 SP - 292 EP - 295 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Laser beam microwelding of transparent plastics JF - Joining Plastics N2 - The laser beam welding of transparent plastic components is still a challenge according to the state of the art. A new approach for the joining of two transparent polymeric components using ultrashort laser beam pulses is presented in this report. In this respect, the high peak pulse intensity associated with these lasers permits non-linear absorption processes and thus the production of a locally well-defined heat source in the interior even of a transparent material or at the boundary layer between two transparent substrates. Welding results for transparent plastics of the cycloolefin copolymer and polycarbonate types are shown in this study. In addition to the investigation into the influences of fundamental process parameters on the weld geometry, the leak tightness is demonstrated in this study using a microfluidic system. KW - Laserschweißen Y1 - 2018 VL - 12 IS - 3/4 SP - 2 EP - 8 ER - TY - CHAP A1 - Roth, Gian-Luca A1 - Wolf, Bastian A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Generation of internal 3D microfluidic architectures in polymers by fs laser processing T2 - Lasers in Manufacturing 2019 N2 - Microfluidic lab on chip systems require components to transport, mix, separate and analyse small volumes of different fluids. In this study, we report on the laser generation of internal hollow architectures created by focused 514 nm femtosecond laser pulses inside PMMA bulk material. Size and cross-sectional shape of a single internal generated microchannel are determined by the intensity distribution inside the focal voxel and can be controlled either by the numerical aperture of the focusing objective or by laser beam shaping. As both approaches are practically limited with respect to the realizable cross-sectional shapes, we present a process based on an internal hatching to expand the achievable channel cross-sections and thereby enable the possibility to create complex 3D shaped internal structures. This process is applied to create fully internal functional microfluidic elements such as mixers which are part of most polymer lab-on-chip systems. KW - Femtosekundenlaser Y1 - 2019 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - A New Approach to Seal Polymer Microfluidic Devices Using Ultrashort Laser Pulses JF - Journal of Laser Micro/Nanoengineering N2 - We report on the joining of two different transparent thermoplastic polymers using infrared femtosecond laser pulses. Solely being based on nonlinear absorption, the developed micro-welding process for cyclo-olefin copolymers and polycarbonate does not require any intermediate absorbing layers or any surface pre-processing of the welding partners. In addition, it circumvents any heat damages at the outer surfaces of the welding partners. Femtosecond laser welding of cyclo-olefin copolymers is improved by increasing the numerical aperture of the focusing setup resulting in a wider and more homogenous welding cross-section. Welding results are classified by shear strength and fracture modes are analyzed using scanning electron microscopy. Furthermore, we demonstrate, to the best of our knowledge, first results of ultrashort pulse laser welding of transparent polycarbonate, one of the most used transparent polymers. In view of an optimized and stable micro-welding process, we study the influence of laser power and focal position on welding results. The application of ultrashort pulse laser welding for Lab-on-chip fabrication technologies is demonstrated by sealing an ultrashort pulse laser ablated microfluidic device based on a transparent polymer substrate. KW - Femtosekundenlaser KW - Laserschweißen Y1 - 2019 VL - 14 IS - 1 SP - 49 EP - 53 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Microchannels inside bulk PMMA generated by femtosecond laser using adaptive beam shaping JF - Optics Express N2 - In this contribution, we report on the generation of internal microchannels with basically unlimited channel length inside of PMMA bulk material by femtosecond laser. A precisely controllable and stable circular channel cross section is obtained by using a spatial light modulator to compensate the writing depth depending spherical aberration. Furthermore, the generation of a rotatable elliptical input beam by adaptive optics ensures a fitting of the beam shaping to the writing direction. In this study, we report on both, the effect of the ellipticity of the input beam and the effect of a correction of the spherical aberration on the circularity of the resulting internal microchannels. Moreover, we demonstrate the application of this writing technique by creating microfluidic testing structures inside of a transparent standard polymer. KW - Femtosekundenlaser KW - Polymethylmethacrylate Y1 - 2020 VL - 28 IS - 4 SP - 5801 EP - 5811 ER - TY - CHAP A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Internal micro structuring of transparent optical polymers by fs laser T2 - Laser-based Micro-and Nanoprocessing XIV 2020 N2 - Lab-on-chip systems are based on components to transport, mix, separate and analyse small volumes of different fluids. The consecutive integration of more complex functions into a single and compact chip demands on multilayer systems. As the classical production using a stacking and joining of single processed layers is elaborate and limited in terms of multilayer structures, an uprising trend to fabricate those devices is the internal, three dimensional processing of transparent substrates by using ultrashort laser pulses. In this study, we report on the generation of internal hollow architectures created by focused 514nm femtosecond laser pulses inside optical polymer bulk materials of different polymers. The three-dimensional channel layout is implemented by moving the sample using three-dimensional motorized stages, allowing arbitrary complex shaped internal channel architectures. Size and cross sectional shape of a single internal generated microchannel are determined by the intensity distribution of the focal voxel. In particular, we show a comprehensive parameter study to improve this laser process with respect to a higher processing speed and stability. KW - Femtosekundenlaser Y1 - 2020 U6 - https://doi.org/10.1117/12.2543487 VL - 11268 SP - 112681L PB - International Society for Optics and Photonics ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Vertical Microchannels for Microfluidic Multilayer Interconnections in PMMA JF - Journal of Laser Micro/Nanoengineering N2 - We report on laser generation of microchannels by focused femtosecond laser pulses inside PMMA bulk material. This process enables direct fabrication of three dimensional microfluidic channel architectures with generally unlimited channel length. Based on nonlinear ultrashort pulse laser absorption of high intensities around the focal volume, a material modification including a refractive index shift is triggered. After laser exposure the channel is created by a gaseous degradation of exposed areas during an annealing process. The 3D channel layout can easily be realized by moving the specimen using 3D motorized stages, allowing freely chosen complex shaped channel architectures. In this report, the creation of inner lying vertical microchannels is examined. In addition to previously shown horizontal channel architectures vertical channels are necessary to fulfill the definition of an internal three-dimensional microfluidic structure and to create interconnections in multilevel lab on chip devices. The cross section and geometry of vertical channels are strongly influenced by laser parameters such as pulse duration, laser power and writing speed. The influence of these process parameters on the channels diameter is determined and parameters are optimized regarding a controllable, stable and reproducible process. The functionality of vertical microchannels as an interconnection between multilayer microfluidic devices is demonstrated using a Rhodamine B solution. KW - Polymethylmethacrylate KW - Femtosekundenlaser Y1 - 2018 VL - 13 IS - 3 SP - 155 EP - 159 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Circular microchannels inside bulk polymethylmethacrylate generated by femtosecond laser using slit beam shaping JF - Journal of Laser Applications N2 - The authors report on the laser generation of three-dimensional microchannel architectures with fundamentally unlimited channel length by focused 514 nm femtosecond laser pulses inside polymethylmethacrylate bulk material. The three-dimensional channel layout is implemented by moving the specimen using three-dimensional motorized stages, allowing freely chosen complex shaped channel architectures. Based on nonlinear absorption of high intensities around the focal volume, a material modification, including a refractive-index shift is triggered. After laser exposure, the channel is created by a gaseous degradation of exposed areas during an annealing process. Cross section and aspect ratio of thus generated microchannels are strongly influenced by the numerical aperture of the applied objective. To obtain a circular cross-sectional shape, high focusing objectives are necessary. In this report, the authors improve the existing setup by using an elliptical input beam, transforming the intensity distribution of the focal area in the propagation direction to a circular shape even for low and medium numerical aperture focusing objectives and therefore avoiding a small working distance as a limiting factor for processing depth. The elliptical input beam is obtained by insertion of a slit mask in front of the focusing objective. The ellipticity of the incident beam defines the aspect ratio of the generated microchannels. Furthermore, the size of internal microchannels is adjustable by varying laser and annealing process parameters. KW - Femtosekundenlaser Y1 - 2019 VL - 31 IS - 2 SP - 022603-1 EP - 022603-5 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Cutting and Drilling of SiC Semiconductor by Fiber Laser JF - Journal of Laser Micro/Nanoengineering N2 - We present an experimental study on fiber laser micromachining of 4H-SiC semiconductor. In particular, we optimize the process time for percussion drilling of 440 µm and 330 µm thick wafers with a minimum drilling time of, eg, 7.5 ms being achieved for 330 µm thick wafers. The drilled holes are characterized by a low taper, a high circularity and entry diameters of about 60 µm. For laser cutting, effective cutting speeds of 2 mm/s and 0.63 mm/s are obtained for 330 µm and 440 µm wafer thickness, respectively, with the cut kerf width being 65 µm. Both processes are associated with a good quality that is characterized by no chipping and cracks. The capability of the fiber laser based micromachining process is highlighted by cutting complex micrometer scale inner and outer contours into partially metallized SiC wafers with high quality. KW - Laserschneiden KW - Faserlaser Y1 - 2015 VL - 10 IS - 3 SP - 279 EP - 283 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Ngo, Chan A1 - Hellmann, Ralf T1 - High aspect ratio cutting of metals using water jet guided laser JF - The International Journal of Advanced Manufacturing Technology KW - Laserschneiden KW - Wasserstrahlschneiden Y1 - 2015 VL - 2015 IS - 80 SP - 2053 EP - 2060 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Schleier, Max A1 - Neumeier, Benedikt A1 - Wilmann, Eugen A1 - Hellmann, Ralf T1 - Optical cutting interruption sensor for fiber lasers JF - Applied Sciences KW - Laserschneiden KW - Faserlaser Y1 - 2015 VL - 2015 IS - 5/3 SP - 544 EP - 554 ER - TY - CHAP A1 - Adelmann, Benedikt A1 - Neumeier, Benedikt A1 - Schleier, Max A1 - Wilmann, Eugen A1 - Hellmann, Ralf T1 - Optical cutting tear detection system for industrial fiber laser based cutting machines T2 - Lasers in Manufacturing Conference 2015 KW - Laserschneiden KW - Faserlaser Y1 - 2015 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Photodiode-based cutting interruption sensor for near-infrared lasers JF - Applied Optics KW - Laserschneiden KW - NIR Y1 - 2016 VL - 2016 IS - 55/7 SP - 1772 EP - 1778 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Investigation on flexural strength changes of alumina caused by cutting using fiber laser JF - Journal of Laser Micro/Nanoengineering KW - Laserschneiden KW - Faserlaser Y1 - 2014 VL - 9 SP - 153 EP - 160 ER - TY - JOUR A1 - Preusch, Florian A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Micromachining of AlN and Al2O3 using fiber laser JF - Micromachines KW - Faserlaser KW - NIR KW - Mikrobearbeitung Y1 - 2014 VL - 2014 IS - 5 SP - 1051 EP - 1060 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Rapid micro hole laser drilling in ceramic substrates using single mode fiber laser JF - Journal of Materials Processing Technology KW - Laserbohren KW - Faserlaser Y1 - 2015 VL - 2015 IS - 221 SP - 80 EP - 86 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Roth, Gian-Luca A1 - Hellmann, Ralf T1 - Back side ablation of SiC diodes using a q-switched NIR laser JF - Journal of Laser Micro/Nanoengineering KW - Halbleiterdiode KW - NIR Y1 - 2015 VL - 10 SP - 190 EP - 194 ER - TY - CHAP A1 - Adelmann, Benedikt T1 - Substrate thinning of SiC semiconductor components using fiber laser T2 - Proceedings of the 7th International Congress on Laser Advanced Materials Processing KW - Faserlaser KW - Halbleiterbauelement Y1 - 2015 IS - 15 ER - TY - CHAP A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Comparative study of experimentally determined and simulated mechanical strength of fiber laser cut alumina substrates T2 - Proceedings of the 7th International Congress on Laser Advanced Materials Processing KW - Laserschneiden KW - Faserlaser KW - Aluminiumoxide Y1 - 2015 VL - 2015 IS - 15 SP - 1 EP - 9 ER - TY - JOUR A1 - Adelmann, Benedikt T1 - Fiber laser cutting of aumina substrates for electronic applications - comparison of the experimentally determined and simulated influence on the mechanical strength JF - Journal of Electrical Engineering KW - Laserschneiden KW - Faserlaser KW - Aluminiumoxide Y1 - 2015 VL - 2015 IS - 3 SP - 111 EP - 119 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - SiC absorption of near-infrared laser radiation at high temperatures JF - Applied Physics A KW - Laserbestrahlung KW - NIR Y1 - 2016 VL - 2016 IS - 122 SP - 1 EP - 7 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Numerical and experimental study on flexural strength of laser microstructured alumina JF - Advances in Ceramic Science and Engineering KW - Faserlaser KW - Aluminiumoxide Y1 - 2016 VL - 2016 IS - 5 SP - 28 EP - 34 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - A study of SiC decomposition under laser irradiation JF - Applied Physics A KW - Laserbestrahlung KW - Faserlaser Y1 - 2017 VL - 2017 IS - 123 SP - 454 EP - 452 ER - TY - JOUR A1 - Adelmann, Benedikt A1 - Hellmann, Ralf T1 - Temperature and stress simulation of 4H-SiC during laser-induced silicidation for ohmic contact generation JF - Metals KW - Ohm-Kontakt KW - Laserbestrahlung Y1 - 2017 VL - 2017 IS - 7 SP - 545 EP - 553 ER - TY - JOUR A1 - Schwarz, Simon A1 - Hellmann, Ralf T1 - Fabrication of Cylindrical Lenses by Combining Ultrashort Pulsed Laser and CO2 Laser JF - Journal of Laser Micro/Nanoengineering KW - Zylinderlinse Y1 - 2017 VL - 12 IS - 2 SP - 76 EP - 79 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - One-dimensional low spatial frequency LIPSS with rotating orientation on fused silica JF - Applied Surface Science KW - Quarzglas KW - Laserbestrahlung Y1 - 2017 VL - 2017 IS - 411 SP - 113 EP - 116 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fabrication of a high-quality axicon by femtosecond laser ablation and CO2 laser polishing for quasi-Bessel beam generation JF - Optics Express KW - Femtosekundenlaser Y1 - 2018 VL - 26 IS - 18 SP - 23287 EP - 23294 ER - TY - JOUR A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Generation of laser-induced periodic surface structures on transparent material-fused silica JF - Applied Physics Letters KW - Laser KW - Oberflächenstruktur KW - Siliziumdioxid KW - Quarzglas Y1 - 2016 VL - 108 IS - 18 SP - 181607 EP - 181607 ER - TY - JOUR A1 - Rung, Stefan A1 - Bokan, Kevin A1 - Rutsch, Kevin A1 - Schwarz, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Laser Induced Periodic Surface Structures on 100Cr6 Steel for Modification of Friction Demonstrated with Stribeck Test JF - Journal of Laser Micro/Nanoengineering N2 - In this contribution, we report on surface functionalization by introducing laser induced periodic surface structures on 100Cr6 bearing steel to modify complex tribological properties. The advanced approach of this study is the measurement of the coefficient of friction by performing a ball-on-disk Stribeck test on laser structured surfaces with polytetrafluoroethylene balls in a lubricant environment. The Stribeck test reveals the modified friction behavior using translation speeds up to 106 mm/min and load forces between 100 mN and 5000 mN. Our results show increased stiction and coefficient of friction for laser structured surfaces in the regime of boundary lubrication which is attributed to the laser induced surface asperities. Decreased coefficient of friction is observed in the regime of mixed and hydrodynamic lubrication, i.e. for velocities higher than 1000 mm/min, for surfaces covered by laser induced periodic surface structures with low spatial frequency. KW - Laser KW - Oberflächenstruktur Y1 - 2018 U6 - https://doi.org/10.2961/jlmn.2018.03.0004 VL - 13 IS - 3 SP - 160 EP - 165 ER - TY - JOUR A1 - Rung, Stefan A1 - Bokan, Kevin A1 - Kleinwort, Frederick A1 - Schwarz, Simon A1 - Simon, Peter A1 - Klein-Wiele, Jan-Hendrik A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Possibilities of Dry and Lubricated Friction Modification Enabled by Different Ultrashort Laser-Based Surface Structuring Methods JF - Lubricants N2 - In this contribution we report on the possibilities of dry and lubricated friction modification introduced by different laser surface texturing methods. We compare the potential of Laser-Induced Periodic Surface Structures and Laser Beam Interference Ablation on 100Cr6 steel in a linear reciprocating ball-on-disc configuration using 100Cr6 steel and tungsten carbide balls with load forces between 50mN and 1000 mN. For dry friction, we find a possibility to reduce the coefficient of friction and we observe a pronounced direction dependency for surfaces fabricated by Laser Beam Interference Ablation. Furthermore, Laser-Induced Periodic Surface Structures result in a load-dependent friction reduction for lubricated linear reciprocating movements. This work helps to identify the modification behaviour of laser generated micro structures with feature sizes of approximately 1μm and reveals new possibilities for surface engineering KW - laser-induced periodic surface structures KW - laser beam interference ablation KW - dry friction KW - lubricated friction KW - laser surface texturing KW - Laser KW - Oberflächenstruktur Y1 - 2019 U6 - https://doi.org/10.3390/lubricants7050043 VL - 7 IS - 43 SP - 1 EP - 13 ER - TY - JOUR A1 - Trautmann, Anika A1 - Roth, Gian-Luca A1 - Nujiqi, Benedikt A1 - Walter, Thomas A1 - Hellmann, Ralf T1 - Towards a versatile point-of-care system combining femtosecond laser generated microfluidic channels and direct laser written microneedle arrays JF - Microsystems & Nanoengineering N2 - Microneedle-based microfluidic systems have a great potential to become well-accepted medical devices for simple, accurate, and painless drug delivery and lab-on-a-chip diagnostics. In this work, we report on a novel hybrid approach combining femtosecond direct laser written microneedles with femtosecond laser generated microfluidic channels providing an important step towards versatile medical point-of-care systems. Hollow microneedle arrays are fabricated by a laser system designed for two-photon polymerization applications. Compression tests of two different types of truncated cone-shaped microneedle arrays prepared from OrmoComp® give information about the microneedle mechanical strength, and the results are compared to skin insertion forces. Three-dimensional microchannels are directly created inside PMMA bulk material by an ultrashort pulse laser system with vertical channels having adjustable cross-sectional areas, which allow attaching of microneedles to the microfluidic system. A comprehensive parameter study varying pulse duration and repetition rate is performed on two-photon polymerization to identify an optimal laser power range for fabricating microneedles using the same pulse duration and repetition rate as for microchannels. This addresses the advantage of a single laser system process that overcomes complex fabrication methods. A proof of concept flow test with a rhodamine B dye solution in distilled water demonstrates that the combination of microneedles and microchannels qualifies for microfluidic injection and extraction applications. KW - Femtosekundenlaser Y1 - 2019 VL - 5 IS - 6 SP - 1 EP - 9 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Control of femtosecond laser generated microfluidic channels inside poly (methyl methacrylate) JF - Journal of Laser Applications N2 - In this study, the authors report on femtosecond laser direct generation of microchannels inside poly(methyl methacrylate) with variable dimensions ranging from a channel height of 20 to 350 μm and an aspect ratio down to 1.2. Focused ultrashort laser pulses are used to trigger a material modification in the focal area which can be selectively opened by a subsequent annealing process. A 3D microchannel architecture can easily be realized by moving the specimen using motorized stages, allowing freely chosen complex shaped channel layouts. While the laser wavelength is identified as one of the main parameters determining process effectiveness, another core of this study is the variation of channel dimensions by the numerical aperture of the applied objective to focus the laser. The authors find that both size and shape of the modified region and the resulting microchannel can be controlled by altering the numerical aperture. KW - Femtosekundenlaser KW - Polymethylmethacrylate Y1 - 2018 VL - 30 IS - 3 SP - 032016-1 EP - 032016-6 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Ultrashort pulse laser micro-welding of cyclo-olefin copolymers JF - Optics and Lasers in Engineering N2 - We report on the joining of transparent thermoplastic polymers using infrared femtosecond laser pulses. Due to nonlinear absorption, the developed micro-welding process for cyclo-olefin copolymers does not require any intermediate absorbing layers or any surface pre-processing of the welding partners. In view of an optimized and stable micro-welding process, the influence of the welding speed and focal position on both, the quality and shear force strength are investigated. We highlight that welding seam widths of down to 65 µm are feasible for welding speeds of up to 75 mm/s. However, a variation of the welding speed affects the required focal position for a successful joining process. The shear force strength of the welding seam is determined to 37 MPa, which corresponds to 64% of the shear strength of the bulk material and is not affected by the welding speed. KW - Laserschweißen KW - Femtosekundenlaser Y1 - 2017 VL - 93 SP - 178 EP - 181 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Welding of transparent polymers using femtosecond laser JF - Applied Physics A N2 - Based on nonlinear absorption, we report on laser welding of cycloolefin copolymers without any additional absorption layer employing infrared femtosecond laser. To the best of our knowledge, this is the first report of ultrashort laser welding of this material class, revealing a remarkable high processing speed of 20 mm/s in a single pass mode. Using a 1028 nm laser having a pulse duration of 220 fs at a repetition rate of 571 kHz leads to a welding seam width between 38 and 137 μm, depending on the applied laser average power. The welded joint is characterized by a maximum shear strength of 40 MPa. The experimental results are compared to those reported for femtosecond laser welding of PMMA and to those published for using a Thulium fiber laser. KW - Femtosekundenlaser KW - Laserschweißen Y1 - 2016 VL - 122 IS - 2 SP - 86 EP - 90 ER - TY - JOUR A1 - Roth, Gian-Luca A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Femtosecond laser direct generation of 3D-microfluidic channels inside bulk PMMA JF - Optics Express N2 - We report on laser direct generation of 3D-microchannels for microfluidic applications inside PMMA bulk material by focused femtosecond pulses. Inner lying channels with cross sectional areas from 100 µm2 to 4400 µm2 are directly created in the volume of a PMMA substrate. Using the presented process, the channel length is fundamentally unlimited. Here we demonstrate a channel length of 6 meters inside a substrate with dimensions of 20 × 20 × 1.1 mm. The formation of the micro channels is based on nonlinear absorption around the focal volume that triggers a material modification. The modified volume can be selectively opened to form the channel by a subsequent annealing process. The cross section of the channel is strongly influenced by the energy distribution and illumination around the focal volume determined by the optical setup and process design. The 3D channel layout can easily be realized by moving the specimen using 3D motorized stage, allowing freely chosen complex shaped channel architectures. Within a comprehensive parameter study, varying laser power, number of multi-passes, writing speed and writing depths, we identify an optimized process in terms of attainable channel height, width and aspect ratio, as well as process stability and reproducibility. The proof of concept for an application in three dimensional microfluidic systems is provided by florescence microscopy using a dye rhodamine B solution in isopropanol. KW - Femtosekundenlaser Y1 - 2017 VL - 25 IS - 15 SP - 18442 EP - 18450 ER - TY - CHAP A1 - Nick, Christoph A1 - Thielemann, Christiane A1 - Joshi, Ravi A1 - Schneider, Jörg T1 - Niedrigtemperatur-Transfer von vertikal ausgerichteten Kohlenstoff Nanoröhren auf Mikrostrukturen T2 - Mikro-Nano-Integration - 3. GMM-Workshop, Stuttgart, Deutschland, 2011 N2 - Vertikal angeordnete Kohlenstoff Nanoröhren (engl. vertically aligned carbon nanotubes; VA-CNT) können seit einigen Jahren mit hoher Reproduzierbarkeit durch CVD-Verfahren bei 600 °C - 800 °C auf Katalysatorschichten aus Aluminium und Eisen hergestellt werden. Sie zeigen sehr gute Eigenschaften im Bereich der Feldemission, aber auch in sub-µm Vias. Allerdings sind die relativ hohen Temperaturen oft nicht prozesskompatibel und müssen vermieden werden um keine Degradation darunterliegender Strukturen in Kauf zu nehmen. Da die Reduzierung der CVD-Temperaturen beim Wachstum der VA-CNTs unter 600 °C zu hohen Defektraten führt, schlagen wir ein neues Verfahren zum Transfer der VA-CNTs bei niedrigen Temperaturen vor. In einer Kombination aus Flip-Chip- und Stempel-Technik werden hoch geordnete, mikrostrukturierte VA-CNTs auf temperaturempfindliche Substrate aus Kalk-Natron-Glas, Gold oder Kupfer bei Temperaturen von 100 °C transferiert. Die vertikale Struktur der Nanoröhren bleibt dabei erhalten. Eine leitende Verbindung kann durch ein leitfähiges, bio-kompatibles Polymer gewährleistet werden, was eine Erweiterung des Einsatzbereichs auf Life-Science Applikationen erlauben würde. KW - Kohlenstoff-Nanoröhre Y1 - 2011 ER - TY - CHAP A1 - Yilmazoglu, Oktay A1 - Al-Daffaie, Shihab A1 - Hartnagel, Hans A1 - Joshi, Ravi A1 - Yadav, Sandeep A1 - Schneider, Jörg A1 - Nick, Christoph A1 - Thielemann, Christiane T1 - CNT photocathodes based on GaAs high-frequency photoswitches T2 - 25th International Vacuum Nanoelectronics Conference, 9 - 13 July 2012, Jeju, South Korea N2 - A high-frequency photocathode based on carbon nanotube (CNT) blocks on semiisolating GaAs or low-temperature grown GaAs was fabricated and used for electron emission in a diode configuration. The CNT blocks can achieve high currents and current densities of I=0.5 mA and J=28 mA/cm 2 at E=2.1 V/μm, respectively. The photomodulation was achieved with a GaAs photoswitch electrically connected to the bottom of the CNT block emitter. This photocathode can find applications in high frequency tubes and optically driven X-ray sources. KW - Kohlenstoff-Nanoröhre Y1 - 2012 U6 - https://doi.org/10.1109/IVNC.2012.6316840 ER - TY - RPRT A1 - Mayer, Margot A1 - Müller, Benedikt A1 - Kadereit, Suzanne A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Human neurospheres on microelectrode arrays: a model to investigate ionizing radiation effects on neuronal network communication T2 - GSI SCIENTIFIC REPORT 2014 KW - Neuronales Netz KW - Mikroelektrode KW - Array KW - Ionisierende Strahlung Y1 - 2014 U6 - https://doi.org/10.15120/GR-2015-1-APPA-HEALTH-15 ER - TY - RPRT A1 - Helm, Alexander A1 - Frank, Simon A1 - Frieß, Johannes A1 - Thielemann, Christiane A1 - Durante, Marco A1 - Ritter, Sylvia T1 - Electrophysiological response of mouse embryonic stem cell-derived cardiomyocytes after X-ray and C-ion exposure T2 - GSI SCIENTIFIC REPORT 2014 KW - Embryonale Stammzelle KW - Herzmuskelzelle Y1 - 2014 U6 - https://doi.org/10.15120/GR-2015-1-APPA-HEALTH-21 ER - TY - RPRT A1 - Frieß, Johannes A1 - Heselich, Anja A1 - Ritter, Sylvia A1 - Layer, Paul A1 - Thielemann, Christiane T1 - Combined effects of ionizing radiation and cardio-active drugs on human iPSC-derived cardiomyocytes T2 - GSI SCIENTIFIC REPORT 2014 KW - Herzmuskelzelle KW - Ionisierende Strahlung Y1 - 2014 U6 - https://doi.org/10.15120/GR-2015-1-APPA-HEALTH-37 ER - TY - JOUR A1 - Nick, Christoph A1 - Schlaak, Helmut A1 - Thielemann, Christiane T1 - Simulation and Measurement of Neuroelectrodes' Characteristics with Integrated High Aspect Ratio Nano Structures JF - AIMS Journal N2 - Improving the interface between electrodes and neurons has been the focus of research for the last decade. Neuroelectrodes should show small geometrical surface area and low impedance for measuring and high charge injection capacities for stimulation. Increasing the electrochemically active surface area by using nanoporous electrode material or by integrating nanostructures onto planar electrodes is a common approach to improve this interface. In this paper a simulation approach for neuro electrodes' characteristics with integrated high aspect ratio nano structures based on a point-contact-model is presented. The results are compared with experimental findings conducted with real nanostructured microelectrodes. In particular, effects of carbon nanotubes and gold nanowires integrated onto microelectrodes are described. Simulated and measured impedance properties are presented and its effects onto the transfer function between the neural membrane potential and the amplifier output signal are studied based on the point-contact-model. Simulations show, in good agreement with experimental results, that electrode impedances can be dramatically reduced by the integration of high aspect ratio nanostructures such as gold nanowires and carbon nanotubes. This lowers thermal noise and improves the signal-to-noise ratio for measuring electrodes. It also may increase the adhesion of cells to the substrate and thus increase measurable signal amplitudes. KW - Neuronales Netz KW - Mikroelektrode Y1 - 2015 U6 - https://doi.org/10.3934/matersci.2015.3.189 VL - 2015 IS - 2 SP - 189 EP - 202 ER - TY - JOUR A1 - Nick, Christoph A1 - Yadav, Sandeep A1 - Joshi, Ravi A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - A three-dimensional microelectrode array composed of vertically aligned ultra-dense carbon nanotube networks JF - Applied Physics Letters N2 - Electrodes based on carbon nanotubes are a promising approach to manufacture highly sensitive sensors with a low limit of signal detection and a high signal-to-noise ratio. This is achieved by dramatically increasing the electrochemical active surface area without increasing the overall geometrical dimensions. Typically, carbon nanotube electrodes are nearly planar and composed of randomly distributed carbon nanotube networks having a limited surface gain for a specific geometrical surface area. To overcome this limitation, we have introduced vertically aligned carbon nanotube (VACNT) networks as electrodes, which are arranged in a microelectrode pattern of 60 single electrodes. Each microelectrode features a very high aspect ratio of more than 300 and thus a dramatically increased surface area. These microelectrodes composed of VACNT networks display dramatically decreased impedance over the entire frequency range compared to planar microelectrodes caused by the enormous capacity increase. This is experimentally verified by electrochemical impedance spectroscopy and cyclic voltammetry. KW - Microelectrode arrays KW - Electrochemical impedance spectroscopy KW - Chemical compounds and components KW - Electrolytes KW - Signal processing KW - Mikroelektrode KW - Array KW - Kohlenstoff-Nanoröhre Y1 - 2015 U6 - https://doi.org/10.1063/1.4926330 VL - 2015 IS - 107 SP - 1 EP - 1 ER - TY - RPRT A1 - Mayer, Margot A1 - Arrizabalaga, Onetsine A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Human embryonic stem cell derived neurospheres form functional networks on microelectrode arrays T2 - GSI Scientific Report 2015 KW - Embryonale Stammzelle KW - Mikroelektrode KW - Array Y1 - 2015 U6 - https://doi.org/10.15120/GR-2016-1 VL - 2015 IS - GSI Report 2016-1 SP - 205 EP - 205 ER - TY - CHAP A1 - Nick, Christoph A1 - Hock, Christina A1 - Emmerich, Florian A1 - Belle, Stefan A1 - Thielemann, Christiane A1 - Asmus, Tim A1 - Loose, Thomas A1 - Wienand, Karlheinz T1 - Ultrathin gold as sensor platform for biomolecules T2 - 2015 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), Changchun, China N2 - Due to the increasing number of diabetes patients worldwide there is an enormous need for accurate, fast and someday also continuous or even closed loop monitoring of blood glucose level. More than 50 years after Clark and Lyons proposed the first glucose enzyme electrodes this concept is still widely in use today. Most concepts use the enzyme glucose oxidase (GOx) that reacts with glucose. These reactions cause a current that is proportional to the amount of glucose present at the sensor. Thus, if the sample volume is known, the blood sugar level can be measured. Although these electrodes have been in use for so long they have the disadvantage of a limited shelf time. In this work we present an enzyme free approach for glucose detection applying ultrathin gold films. According to the basic Fuchs-Sondheimer-theory and other more sophisticated models the resistivity of ultrathin metal films is dominated by scattering effects at their surface. Chemical reactions at the metallic surface are expected to change the conductivity properties and thus these changes can be used to detect molecules. This can be done by creating a self-assembled monolayer at the gold surface. When molecules such as glucose bind to the end groups of this layer the electron scattering and thus the conductivity of the film is expected to change. Ultrathin gold films with a thickness of 6 nm show the largest relative change in resistivity and are thus the preferred film thickness for this application. These gold films show a significant change in resistance when model molecules sodium sulfide and dextran are present, whereas the resistance of a platinum reference electrode does not change significantly. KW - ultrathin gold KW - biosensor KW - glucose KW - enzyme free glucose sensor KW - Biosensor KW - Dünne Schicht KW - Gold Y1 - 2015 U6 - https://doi.org/10.1109/3M-NANO.2015.7425462 ER - TY - CHAP A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Patterning of PMMA by gold-nanoparticle initiated localized decomposition T2 - 2015 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), Changchun, China N2 - The need for manipulating matter at its smallest scale has been a hot topic in research for the last decades. As the final goal of arranging single atoms has been achieved, research focuses on two targets: firstly, improving the capabilities of existing technologies towards nanometer resolution and secondly, finding new methods for producing nanostructures in a fast and easy way. Here, we present a new maskless method for sub-micro-patterning of poly(methyl methacrylate) (PMMA) thin films. By applying atomic-force-microscope (AFM) assisted nano-xerography, electric charges were locally injected with an AFM-tip into PMMA. The resulting electrostatic patterns attracted charged gold-nanoparticles, which were selectively deposited onto the PMMA layers with lateral dimensions below 200 nm. In a second step, heat treatment at 275 °C initiated a selective decomposition of the PMMA layer, only observed in PMMA-areas covered with nanoparticles, whereas uncovered areas were not modified by the heat treatment. Analyzing the grooves with the AFM, we found that lines with a width in the sub-micrometer range to several micrometers have successfully been realized. We propose this new and promising method to manufacture nano-grooves used as masking for lift-off processes, for functionalization of underlying areas, or for micro-contact-printing. KW - Nanoparticles KW - Gold KW - Thermal stability KW - Heating KW - Electrostatics KW - Polymethylmethacrylate KW - Dünnschichttechnik Y1 - 2015 U6 - https://doi.org/10.1109/3M-NANO.2015.7425480 ER - TY - JOUR A1 - Samhaber, Robert A1 - Schottdorf, Manuel A1 - El Hady, Ahmed A1 - Bröking, Kai A1 - Daus, Andreas A1 - Thielemann, Christiane A1 - Stühmer, Walter A1 - Wolf, Fred T1 - Growing neuronal islands on multi-electrode arrays using an accurate positioning-μCP device JF - Journal of Neuroscience Methods N2 - Background: Multi-electrode arrays (MEAs) allow non-invasive multi-unit recording in-vitro from cultured neuronal networks. For sufficient neuronal growth and adhesion on such MEAs, substrate preparation is required. Plating of dissociated neurons on a uniformly prepared MEA's surface results in the formation of spatially extended random networks with substantial inter-sample variability. Such cultures are not optimally suited to study the relationship between defined structure and dynamics in neuronal networks. To overcome these shortcomings, neurons can be cultured with pre-defined topology by spatially structured surface modification. Spatially structuring a MEA surface accurately and reproducibly with the equipment of a typical cell-culture laboratory is challenging. New method: In this paper, we present a novel approach utilizing micro-contact printing (μCP) combined with a custom-made device to accurately position patterns on MEAs with high precision. We call this technique AP-μCP (accurate positioning micro-contact printing). Comparison with existing methods: Other approaches presented in the literature using μCP for patterning either relied on facilities or techniques not readily available in a standard cell culture laboratory, or they did not specify means of precise pattern positioning. Conclusion: Here we present a relatively simple device for reproducible and precise patterning in a standard cell-culture laboratory setting. The patterned neuronal islands on MEAs provide a basis for high throughput electrophysiology to study the dynamics of single neurons and neuronal networks. KW - MEA KW - Patterning KW - μCP KW - Mehrfachelektrode KW - Neuronales Netz Y1 - 2016 U6 - https://doi.org/10.1016/j.jneumeth.2015.09.022 VL - 2016 IS - 257 SP - 194 EP - 203 ER - TY - JOUR A1 - Flachs, Dennis A1 - Ciba, Manuel T1 - Cell-based sensor chip for neurotoxicity measurements in drinking water JF - Lékař a technika - Clinician and Technology N2 - Our drinking water contains residues of pharmaceuticals. A sub-group of these contaminants are neuro-active substances, the antiepileptic carbamazepine being one of the most relevant. For assessment of the neurotoxicity of this drug at a sub-therapeutic level, a cell-based sensor chip platform has been realized and characterized. For this purpose, a microelectrode array chip was designed and processed in a clean room and optimized in terms of low processing costs and good recording properties. For characterization of the system neuronal cells were plated on microelectrode array chips and electrical activity was measured as a function of applied carbamazepine concentration. We found that the relative spike rate decreased with increasing drug concentration resulted in IC50 values of around 36 μM. This value is five orders of magnitude higher than the maximal dose found in drinking water. IC50 values for burst rate, burst duration and synchrony were slightly higher, suggesting spike rate being a more sensitive parameter to carbamazepine. KW - Microelectrode array KW - Carbamazepine KW - Neurotoxicity KW - Cell-based biosensor KW - Mikroelektrode KW - Array KW - Biosensor KW - Neurotoxizität Y1 - 2016 VL - 46 IS - 2 SP - 46 EP - 50 ER - TY - JOUR A1 - Oster, Stefan A1 - Daus, Andreas A1 - Erbes, Christian A1 - Goldhammer, Michael A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - Long‐term electromagnetic exposure of developing neuronal networks: A flexible experimental setup JF - Bioelectromagnetics N2 - Neuronal networks in vitro are considered one of the most promising targets of research to assess potential electromagnetic field induced effects on neuronal functionality. A few exposure studies revealed there is currently no evidence of any adverse health effects caused by weak electromagnetic fields. Nevertheless, some published results are inconsistent. Particularly, doubts have been raised regarding possible athermal biological effects in the young brain during neuronal development. Therefore, we developed and characterized a flexible experimental setup based on a transverse electromagnetic waveguide, allowing controlled, reproducible exposure of developing neuronal networks in vitro. Measurement of S‐parameters confirmed very good performance of the Stripline in the band of 800–1000 MHz. Simulations suggested a flexible positioning of cell culture dishes throughout a large exposure area, as specific absorption rate values were quite independent of their position (361.7 ± 11.4 mW/kg) at 1 W, 900 MHz. During exposure, thermal drift inside cellular medium did not exceed 0.1 K. Embryonic rat cortical neurons were cultivated on microelectrode array chips to non‐invasively assess electrophysiological properties of electrogenic networks. Measurements were taken for several weeks, which attest to the experimental setup being a reliable system for long‐term studies on developing neuronal tissue. KW - RF exposure setup KW - mobile communication frequencies KW - SAR dosimetry KW - microelectrode array KW - electrophysiology KW - Neuronales Netz KW - Mikroelektrode KW - Array Y1 - 2016 U6 - https://doi.org/10.1002/bem.21974 VL - 2016 IS - 37 SP - 264 EP - 278 ER - TY - CHAP A1 - Mayer, Margot A1 - Arrizabalaga, Onetsine A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Human Embryonic Stem Cell Derived Neurospheres - A Novel Three Dimensional Model For Neurotoxicological Studies T2 - Frontiers N2 - At present, most neurotoxicological studies in the field of microelectrode array (MEA) technology are based on in vivo or in vitro animal models, particularly in mice or rats. These models contributed much to our knowledge about molecular and cellular mechanisms of neurotoxins affecting the central nervous system. Yet, animal models are not necessarily capable to forecasting the effectiveness of treatment in clinical trials. Therefore the development and characterization of suitable neuronal cell models derived from human cells is emerging in the field of toxicity testing. In this study, we present neurospheres (NS) as a new three dimensional (3D) neuronal cell model based on human embryonic stem cells (hESC), coupled onto microelectrode arrays (MEA). This cell-based assay serves as platform to investigate effects of neuroactive substances on network communication. In order to characterize the neurospheres’ reaction, the well-known GABA receptor antagonist bicuculline and the sodium channel blocker carbamazepine are applied. Preliminary results reveal anticipated and physiologically reasonable alterations in network activity. Thus, we have the first evidence that hESC derived NS are a promising 3D cell model for neurotoxicity testing. In further studies, this model will be used to investigate effects of ionizing radiation on network signaling. KW - human embryonic stem cells KW - neurospheres KW - MEA chips KW - 3D KW - Mikroelektrode KW - Array KW - Embryonale Stammzelle Y1 - 2016 U6 - https://doi.org/10.3389/conf.fnins.2016.93.00081 VL - 2016 IS - MEA Meeting 2016 ER - TY - CHAP A1 - Köhler, Tim A1 - Wölfel, Maximilian A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - TETRA specific long-term exposure of neuronal in vitro networks T2 - BioEM2016 KW - Neuronales Netz Y1 - 2016 ER - TY - CHAP A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Characterization Of Graphene-Coated Microelectrode Arrays For Recording And Stimulation Of Neuronal Cells T2 - Frontiers KW - Mikroelektrode KW - Array KW - Nervenstimulation Y1 - 2016 U6 - https://doi.org/10.3389/conf.fnins.2016.93.00013 VL - 2016 IS - MEA Meeting 2016 ER - TY - JOUR A1 - Kupnik, Mario A1 - Thielemann, Christiane T1 - In vitro platform for acoustic and electrophysiological investigations of ultrasound stimulation JF - Brain Stimulation N2 - Since the first time discovered that ultrasound can influence neuronal activity - more than half a century ago - a lot of progress has been made in this field. The possibilities of ultrasound for neuromodulation have been demonstrated in many experiments such as in vivo stimulation of rodent brain or of human cochlear, Further, in vitro experiments with hippocampal slices and other cell types have been performed as well. KW - Neuronales Netz KW - Ultraschall Y1 - 2017 U6 - https://doi.org/10.1016/j.brs.2017.01.465 VL - 10 IS - 2 SP - 501 ER - TY - GEN A1 - Emmerich, Florian A1 - Ciba, Stefan T1 - Thin-film Micro-Heater for Fusion Bonding of Teflon-FEP Foils T2 - 21th International Student Conference on Electrical Engineering POSTER 2017 N2 - MEMS-based Micro-Heaters, in combination with thin-film temperature sensors, are often used for providing the necessary amount of thermal energy for sensor-applications. In this work, we propose an integrated micro-heater as actuator for fusion bonding of polymers, which can optimize the production process of electret-based micro-energy-harvesters. By adjusting the design parameters of thermoforming-molds, we can implement thin-film micro-heaters that are capable of generating temperatures of above 300°C for numerous cycles. Utilizing the integrated micro-heater allows local fusion bonding of Fluoroethylenepropylene (Teflon-FEP) foils on a micrometer-scale while reducing unnecessary thermal stress. This is beneficial for the longevity of the micro-energy-harvesters, while simultaneously improving its performance. N2 - Poster KW - Energy-Harvesting KW - Fusion Bonding KW - Micro-Heater KW - SU-8 KW - Teflon-FEP KW - Mikrosystemtechnik Y1 - 2017 VL - 2017 IS - POSTER 2017 SP - 1 EP - 5 ER - TY - CHAP A1 - Ciba, Manuel A1 - Bahmer, Andreas A1 - Thielemann, Christiane T1 - Application of spike train synchrony measure Spike‑contrast to quantify the effect of bicuculline on cortical networks grown on microelectrode arrays T2 - BMC Neuroscience KW - Mikroelektrode KW - Array Y1 - 2017 U6 - https://doi.org/10.1186/s12868-017-0372-1 VL - 2017 IS - 18 ER - TY - JOUR A1 - Bestel, Robert A1 - Appali, Revathi A1 - van Rienen, Ursula A1 - Thielemann, Christiane T1 - Effect of Morphologic Features of Neurons on the Extracellular Electric Potential: A Simulation Study Using Cable Theory and Electro-Quasi-Static Equations JF - Neural Computation N2 - Microelectrode arrays serve as an indispensable tool in electro-physiological research to study the electrical activity of neural cells, enabling measurements of single cell as well as network communication analysis. Recent experimental studies have reported that the neuronal geometry has an influence on electrical signaling and extracellular recordings. However, the corresponding mechanisms are not yet fully understood and require further investigation. Allowing systematic parameter studies, computational modeling provides the opportunity to examine the underlying effects that influence extracellular potentials. In this letter, we present an in silico single cell model to analyze the effect of geometrical variability on the extracellular electric potentials. We describe finite element models of a single neuron with varying geometric complexity in three-dimensional space. The electric potential generation of the neuron is modeled using Hodgkin-Huxley equations. The signal propagation is described with electro-quasi-static equations, and results are compared with corresponding cable equation descriptions. Our results show that both the geometric dimensions and the distribution of ion channels of a neuron are critical factors that significantly influence both the amplitude and shape of extracellular potentials. KW - Mikroelektrode KW - Array Y1 - 2017 U6 - https://doi.org/10.1162/neco_a_01019 VL - 2017 IS - 29 SP - 2955 EP - 2978 ER - TY - JOUR A1 - Ciba, Manuel A1 - Isomura, Takuya A1 - Jimbo, Yasuhiko A1 - Bahmer, Andreas A1 - Thielemann, Christiane T1 - Spike-contrast: A novel time scale independent and multivariate measure of spike train synchrony JF - Journal of Neuroscience Methods N2 - Background: Synchrony within neuronal networks is thought to be a fundamental feature of neuronal networks. In order to quantify synchrony between spike trains, various synchrony measures were developed. Most of them are time scale dependent and thus require the setting of an appropriate time scale. Recently, alternative methods have been developed, such as the time scale independent SPIKE-distance by Kreuz et al. New method: In this study, a novel time-scale independent spike train synchrony measure called Spike-contrast is proposed. The algorithm is based on the temporal “contrast” (activity vs. non-activity in certain temporal bins) and not only provides a single synchrony value, but also a synchrony curve as a function of the bin size. Results: For most test data sets synchrony values obtained with Spike-contrast are highly correlated with those of the SPIKE-distance (Spearman correlation value of 0.99). Correlation was lower for data containing multiple time scales (Spearman correlation value of 0.89). When analyzing large sets of data, Spike-contrast performed faster. Comparison of existing method: Spike-contrast is compared to the SPIKE-distance algorithm. The test data consisted of artificial spike trains with various levels of synchrony, including Poisson spike trains and bursts, spike trains from simulated neuronal Izhikevich networks, and bursts made of smaller bursts (sub-bursts). Conclusions: The high correlation of Spike-contrast with the established SPIKE-distance for most test data, suggests the suitability of the proposed measure. Both measures are complementary as SPIKE-distance provides a synchrony profile over time, whereas Spike-contrast provides a synchrony curve over bin size. KW - Synchrony KW - Neuronal Networks KW - Point processes KW - Time series analysis KW - Parallel spike trains KW - Neuronales Netz Y1 - 2017 U6 - https://doi.org/10.1016/j.jneumeth.2017.09.008 VL - 2018 IS - 293 SP - 136 EP - 143 ER - TY - JOUR A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Optimizing dimensions of unipolar Teflon-FEP piezoelectrets with micro-system-technology JF - Journal of Physics: Conference Series N2 - In this work we present a new micro-system-technology based production process for unipolar ferroelectrets. Theoretical analysis of the influence of the air-gap size on the electric field distribution as well as on the induced charge on the electrodes shows superior performance of unipolar piezoelectrets with small air-gaps. For the production of these small air-gaps we developed a new design using a photoresist thermoforming master, an integrated micro-heater and shadow masks for metallization. Unipolar piezoelectrets produced with this technology exhibit increased d33-coefficients compared to designs in previous publications. These piezoelectrets are highly preferable for energy-harvesting applications, as they promise high electric power output. KW - Mikrosystemtechnik Y1 - 2017 VL - 2018 IS - 1052 SP - 1 EP - 4 ER - TY - GEN A1 - De Blasi, Stefano T1 - Simulation of Large Scale Neural Networks for Evaluation Applications T2 - 22nd International Student Conference on Electrical Engineering POSTER 2018 N2 - Understanding the complexity of biological neural networks like the human brain is one of the scientific challenges of our century. The organization of the brain can be described at different levels, ranging from small neural networks to entire brain regions. Existing methods for the description of functionally or effective connectivity are based on the analysis of relations between the activities of different neural units by detecting correlations or information flow. This is a crucial step in understanding neural disorders like Alzheimer’s disease and their causative factors. To evaluate these estimation methods, it is necessary to refer to a neural network with known connectivity, which is typically unknown for natural biological neural networks. Therefore, network simulations, also in silico, are available. In this work, the in silico simulation of large scale neural networks is established and the influence of different topologies on the generated patterns of neuronal signals is investigated. The goal is to develop standard evaluation methods for neurocomputational algorithms with a realistic large scale model to enable benchmarking and comparability of different studies. N2 - Poster KW - biological neural network KW - evaluation method KW - in silico KW - spike trains KW - Neuronales Netz Y1 - 2018 VL - 2018 IS - POSTER 2018 SP - 1 EP - 6 ER - TY - GEN A1 - Allig, Sebastian T1 - Controlled Cell Formation Using Bioprinting T2 - 22nd International Student Conference on Electrical Engineering POSTER 2018 N2 - Applying technologies of additive manufacturing to the field of tissue engineering created a pioneering new approach tomodelcomplex cell systemsartificially. Regarding its huge potential, bioprinting is still in its infancies and many questions are still unanswered. To address this issue, an extrusion-based bioprinting process was used to deposit human embryonic kidney (HEK) cellsin a defined pattern.It wasshownthat cells remained viable in the bioprinted construct for up to 8 days after printing (DAP). This work displays a proof of principle for a controlled cell formation which shall later be appliedtoin vitro drug screening tests. N2 - Poster KW - Bioprinting KW - Bioink KW - Tissue Engineering KW - In vitro cell systems KW - Biomaterial Y1 - 2018 VL - 2018 IS - POSTER 2018 SP - 1 EP - 5 ER - TY - GEN A1 - Uhrig, Janis A1 - Emmerich, Florian T1 - Study on different template-based production processes for magnetic nanowires T2 - 22nd International Student Conference on Electrical Engineering POSTER 2018 N2 - Nickel-iron (NiFe) nanowires with a high contentof nickel and large aspect-ratio show promising characteris-tics for applications in modern micro-systems. In this study,nanowires with well-controlled diameter, height and compo-sition are fabricated using nanoporous poly-carbonate (PC)and anodized aluminum-oxide (AAO) membranes. Differ-ences between potentiostatic and pulsed deposition methodswere studied with regard to their flexibility and a recommen-dation for the best use of the individual types is given. Withthe application of the presented processes, future technolo-gies as magnetic energy-harvesting or nano-fluxgate sensorscan be improved. N2 - Poster KW - magnetic nanowires KW - MEMS KW - template-based KW - electroplating KW - Nanodraht Y1 - 2018 VL - 2018 IS - POSTER 2018 SP - 1 EP - 5 ER - TY - JOUR A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Belle, Stefan A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Electrochemical Characterization of Graphene Microelectrodes for Biological Applications JF - ChemNanoMat N2 - Graphene is a promising material both as a coating for existing neural electrodes as well as for transparent electrodes made exclusively from graphene. We studied graphene‐based microelectrodes by investigating their recording and stimulation properties in order to evaluate their suitability for neuronal implants. In this work, we compare three different electrode material compositions. Microelectrode arrays (MEA) with an electrode size of about 700 μm2 were prepared of gold, graphene on gold, and plain graphene on glass substrate. In order to reduce polymer contamination during graphene transfer, we employed a polymer‐free transfer and lift‐off process. Impedance studies revealed a value of 2.3 MΩ at 1 kHz for plain, and 0.88 MΩ for graphene on gold. Neuronal recording experiments showed a sufficient SNR for both graphene‐based materials and a stable impedance, unaffected by surface degradation metal electrodes are known for. Stimulation measurements yielded a charge injection capacity of 0.15 mC/cm2 using biphasic pulses of 1 ms and 1 μA transparent graphene electrodes. Cyclic voltammetry revealed a large voltage range of −1.4 V to +1.6 V before water electrolysis occurs. Graphene‐coated gold microelectrodes show enhanced recording properties, whereas plain graphene electrodes might be better suited for stimulation applications. KW - Graphene KW - Microelectrodes KW - Stimulation KW - Neural Recording KW - Neural Interface KW - Mikroelektrode KW - Array Y1 - 2019 U6 - https://doi.org/10.1002/cnma.201800652 VL - 2019 IS - 5:4 SP - 427 EP - 435 ER - TY - CHAP A1 - Mayer, Margot A1 - Arrizabalaga, Onetsine A1 - Schröder, Insa A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Human Embryonic Stem Cell Derived Neurospheres – 2D and 3D Cell Culture in one sample N2 - Various studies have shown that two dimensional (2D) neuronal cell cultures does not recapitulate structure and physiology of three-dimensional (3D) in vivo tissues. These findings are of paramount importance for drug screening, since the response to neurotoxicological substances may differ for 2D und 3D cell culture models. To address this topic, we present human embryonic stem cell (hESC) derived neurospheres (NS) coupled onto microelectrode array (MEA) chips as a model system that includes a 3D NS as well as an outgrowing 2D monolayer allowing direct comparison of functionality within one culture. Preliminary results revealed an enhanced functional reactions of 3D NS to GABA receptor antagonist bicuculline compared to the 2D domain. Thus we have the first evidence that hESC derived NS are a promising model system for neurotoxicity testing enabling a direct comparison between functionality of neurons grown in 2D or 3D. KW - MEA Chips KW - neurospheres KW - human embryonic stem cells KW - 3D KW - Bicuculline KW - Embryonale Stammzelle Y1 - 2018 UR - https://www.frontiersin.org/10.3389/conf.fncel.2018.38.00078/event_abstract ER - TY - CHAP A1 - Ciba, Manuel A1 - Thielemann, Christiane T1 - Synchrony changes on different time-scales during in vitro neuronal network development KW - Synchrony KW - Time-scales KW - spike-contrast KW - developing neuronal networks KW - spike train analysis KW - Neuronales Netz Y1 - 2018 UR - https://www.frontiersin.org/10.3389/conf.fncel.2018.38.00081/event_abstract ER - TY - GEN A1 - Ciba, Manuel A1 - Mayer, Margot A1 - Thielemann, Christiane T1 - Experimental setup to investigate the effect of psychedelics on in vitro neuronal networks N2 - Experimental setup to investigate the effect of psychedelics on in vitro neuronal networks: A demonstration of the application of in vitro neuronal networks on high-density-microelectrode arrays (HDMEA) to study electrophysiological properties of neuronal networks in response to psychedelics. N2 - Poster KW - Neuronales Netz Y1 - 2019 UR - https://doi.org/10.6084/m9.figshare.11980434.v1 U6 - https://doi.org/10.6084/m9.figshare.11980434.v1 ER - TY - JOUR A1 - Mayer, Margot A1 - Arrizabalaga, Onetsine A1 - Lieb, Florian A1 - Ciba, Manuel A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Electrophysiological investigation of human embryonic stem cell derived neurospheres using a novel spike detection algorithm JF - Biosensors and Bioelectronics N2 - Microelectrode array (MEA) technology in combination with three-dimensional (3D) neuronal cell models derived from human embryonic stem cells (hESC) provide an excellent tool for neurotoxicity screening. Yet, there are significant challenges in terms of data processing and analysis, since neuronal signals have very small amplitudes and the 3D structure enhances the level of background noise. Thus, neuronal signal analysis requires the application of highly sophisticated algorithms. In this study, we present a new approach optimized for the detection of spikes recorded from 3D neurospheres (NS) with a very low signal-to-noise ratio. This was achieved by extending simple threshold-based spike detection utilizing a highly sensitive algorithm named SWTTEO. This analysis procedure was applied to data obtained from hESC-derived NS grown on MEA chips. Specifically, we examined changes in the activity pattern occurring within the first ten days of electrical activity. We further analyzed the response of NS to the GABA receptor antagonist bicuculline. With this new algorithm method we obtained more reliable results compared to the simple threshold-based spike detection. KW - Microelectrode array KW - Neurosphere KW - Spike detection algorithm KW - Human embryonic stem cell-derived neurons KW - SWTTEO KW - Embryonale Stammzelle Y1 - 2018 U6 - https://doi.org/10.1016/j.bios.2017.09.034 VL - 2018 IS - 100 SP - 462 EP - 468 ER - TY - JOUR A1 - Köhler, Tim A1 - Wölfel, Maximilian A1 - Ciba, Manuel A1 - Bochtler, Ulrich A1 - Thielemann, Christiane T1 - Terrestrial Trunked Radio (TETRA) exposure of neuronal in vitro networks JF - Environmental Research N2 - Terrestrial Trunked Radio (TETRA) is a worldwide common mobile communication standard, used by authorities and organizations with security tasks. Previous studies reported on health effects of TETRA, with focus on the specific pulse frequency of 17.64 Hz, which affects calcium efflux in neuronal cells. Likewise among others, it was reported that TETRA affects heart rate variability, neurophysiology and leads to headaches. In contrast, other studies conclude that TETRA does not affect calcium efflux of cells and has no effect on people's health. In the present study we examine whether TETRA short- and long-term exposure could affect the electrophysiology of neuronal in vitro networks. Experiments were performed with a carrier frequency of 395 MHz, a pulse frequency of 17.64 Hz and a differential quaternary phase-shift keying (π/4 DQPSK) modulation. Specific absorption rates (SAR) of 1.17 W/kg and 2.21 W/kg were applied. In conclusion, the present results do not indicate any effect of TETRA exposure on electrophysiology of neuronal in vitro networks, neither for short-term nor long-term exposure. This applies to the examined parameters spike rate, burst rate, burst duration and network synchrony. KW - Neuronales Netz Y1 - 2018 U6 - https://doi.org/10.1016/j.envres.2017.12.007 VL - 2018 IS - 162 SP - 1 EP - 7 ER - TY - JOUR A1 - Heselich, Anja A1 - Frieß, Johannes A1 - Ritter, Sylvia A1 - Benz, Naja A1 - Layer, Paul A1 - Thielemann, Christiane T1 - High LET radiation shows no major cellular and functional effects on primary cardiomyocytes in vitro JF - Life Sciences in Space Research N2 - It is well known that ionizing radiation causes adverse effects on various mammalian tissues. However, there is little information on the biological effects of heavy ion radiation on the heart. In order to fill this gap, we systematically examined DNA-damage induction and repair, as well as proliferation and apoptosis in avian cardiomyocyte cultures irradiated with heavy ions such as titanium and iron, relevant for manned space-flight, and carbon ions, as used for radiotherapy. Further, and to our knowledge for the first time, we analyzed the effect of heavy ion radiation on the electrophysiology of primary cardiomyocytes derived from chicken embryos using the non-invasive microelectrode array (MEA) technology. As electrophysiological endpoints beat rate and field action potential duration were analyzed. The cultures clearly exhibited the capacity to repair induced DNA damage almost completely within 24 h, even at doses of 7 Gy, and almost completely recovered from radiation-induced changes in proliferative behavior. Interestingly, no significant effects on apoptosis could be detected. Especially the functionality of primary cardiac cells exhibited a surprisingly high robustness against heavy ion radiation, even at doses of up to 7 Gy. In contrast to our previous study with X-rays the beat rate remained more or less unaffected after heavy ion radiation, independently of beam quality. The only change we could observe was an increase of the field action potential duration of up to 30% after titanium irradiation, diminishing within the following three days. This potentially pathological observation may be an indication that heavy ion irradiation at high doses could bear a long-term risk for cardiovascular disease induction. KW - Cardiomyocytes KW - Heavy ion irradiation KW - Space radiation KW - Electrophysiology KW - MEA-technology KW - Zellkultur KW - Herzmuskelzelle Y1 - 2018 U6 - https://doi.org/10.1016/j.lssr.2018.01.001 VL - 2018 IS - 16 SP - 93 EP - 100 ER - TY - JOUR A1 - Flachs, Dennis A1 - Köhler, Tim A1 - Thielemann, Christiane T1 - Transparent poly(3,4-ethylenedioxythiophene)-based microelectrodes for extracellular recording JF - Biointerphases N2 - It is well known that at the interface between neuronal tissue and recording electrode low electrical impedance is required. However, if simultaneous optical detection or stimulation is an issue, good optical transmittance of the electrode material is desirable as well. State-of-the-art titanium nitride electrodes provide superior low impedance compared to gold or iridium, but are nontransparent. Transparent electrode materials like the transparent conducting oxide, indium tin oxide (ITO), or graphene offer high light transmittance (>80%) but reveal relatively high impedance. In this paper, the authors propose the conducting polymer poly(3,4-ethylenedioxythiophene) with the counter ion NO−3 as the electrode material for low impedance and good optical transmittance properties. The polymer is electrochemically deposited onto ITO improving the relatively high impedance of ITO. This multilayer electrode allows not only for electrophysiological recordings of cardiomyocytes but also for monitoring of cell contraction under the microscope. Electrochemical impedance spectroscopy and action potential recordings reveal that the new transparent electrodes are a good compromise in terms of low impedance and transparency if deposition parameters are optimized. KW - Impedanzspektroskopie KW - Mikroelektrode Y1 - 2018 U6 - https://doi.org/10.1116/1.5041957 VL - 2018 IS - 13:041008 SP - 1 EP - 1 ER - TY - JOUR A1 - Allig, Sebastian A1 - Mayer, Margot A1 - Thielemann, Christiane T1 - Workflow for bioprinting of cell-laden bioink JF - Lekar a technika – Clinician and Technology N2 - Applying technologies of additive manufacturing to the field of tissue engineering created a pioneering new approach to model complex cell systems artificially. Regarding its huge potential, bioprinting is still in its infancies and many questions are still unanswered. To address this issue, an extrusion-based bioprinting (EBB) process was used to deposit human embryonic kidney (HEK) cells in a defined pattern. It was shown that the bioprinted construct featured a high degree in viability reaching up to 77% 10 days after printing (DAP). This work displays a proof of principle for a controlled cell formation which shall later be applied to in vitro drug screening tests using various types of cells. KW - Extrusion-based bioprinting KW - bioink KW - tissue engineering KW - in vitro cell systems KW - Biomaterial KW - Biomedizinische Technik Y1 - 2018 VL - 48 IS - 2 SP - 46 EP - 51 ER - TY - JOUR A1 - De Blasi, Stefano A1 - Ciba, Manuel A1 - Bahmer, Andreas A1 - Thielemann, Christiane T1 - Total spiking probability edges: A cross-correlation based method for effective connectivity estimation of cortical spiking neurons JF - Journal of Neuroscience Methods N2 - Background: Connectivity is a relevant parameter for the information flow within neuronal networks. Network connectivity can be reconstructed from recorded spike train data. Various methods have been developed to estimate connectivity from spike trains. New method: In this work, a novel effective connectivity estimation algorithm called Total Spiking Probability Edges (TSPE) is proposed and evaluated. First, a cross-correlation between pairs of spike trains is calculated. Second, to distinguish between excitatory and inhibitory connections, edge filters are applied on the resulting cross-correlogram. Results: TSPE was evaluated with large scale in silico networks and enables almost perfect reconstructions (true positive rate of approx. 99% at a false positive rate of 1% for low density random networks) depending on the network topology and the spike train duration. A distinction between excitatory and inhibitory connections was possible. TSPE is computational effective and takes less than 3 min on a high-performance computer to estimate the connectivity of an 1 h dataset of 1000 spike trains. Comparison of existing methods: TSPE was compared with connectivity estimation algorithms like Transfer Entropy based methods, Filtered and Normalized Cross-Correlation Histogram and Normalized Cross-Correlation. In all test cases, TSPE outperformed the compared methods in the connectivity reconstruction accuracy. Conclusions: The results show that the accuracy of functional connectivity estimation of large scale neuronal networks has been enhanced by TSPE compared to state of the art methods. Furthermore, TSPE enables the classification of excitatory and inhibitory synaptic effects. KW - Connectivity Estimation KW - Neuronal Networks KW - Parallel Spike Trains KW - Inhibitory and Excitatory KW - Neuronales Netz Y1 - 2019 U6 - https://doi.org/10.1016/j.jneumeth.2018.11.013 VL - 312 IS - 312 SP - 169 EP - 181 ER - TY - JOUR A1 - Flachs, Dennis A1 - Emmerich, Florian A1 - Roth, Gian-Luca A1 - Hellmann, Ralf A1 - Thielemann, Christiane T1 - Laser-bonding of FEP/FEP interfaces for a flexiblemanufacturing process of ferroelectrets JF - Journal of Physics: Conference Series N2 - This paper presents an optimized laser-bonding process for piezoelectric energy-harvesters based on thin fluorinated-ethylene-propylene (FEP) foils, using an ultra-short-pulse(USP) laser. Due to the minimized thermal stress in the material during bonding, achieved bypulse durations of few picoseconds, we created seams down to 40μm width without generatingholes in the 12.5μm thick FEP-foils. Using a galvanometer scanning system allowed for fastbonding-speed up to several centimeters per second, making the process also suitable for largestructures and areas. The achieved bond strength of the seams under influence of shearingstress was examined using tensile testing, which showed a sufficient strength of about 25 % of the maximum strength of an unbonded, single layer of FEP. KW - Ultrakurzzeitlaser KW - Piezoelektrizität Y1 - 2019 U6 - https://doi.org/10.1088/1742-6596/1407/1/012107 VL - 1407 IS - 012107 SP - 1 EP - 5 ER - TY - JOUR A1 - Ciba, Manuel A1 - Bestel, Robert A1 - Nick, Christoph A1 - Ferraz de Arruda, Guilherme A1 - Peron, Thomas A1 - Henrique, Comin César A1 - da Fontoura Costa, Luciano A1 - Aparecido Rodrigues, Francisco A1 - Thielemann, Christiane T1 - Comparison of Different Spike Train Synchrony Measures Regarding Their Robustness to Erroneous Data from Bicuculline-Induced Epileptiform Activity JF - Neural Computation N2 - As synchronized activity is associated with basic brain functions and pathological states, spike train synchrony has become an important measure to analyze experimental neuronal data. Many measures of spike train synchrony have been proposed, but there is no gold standard allowing for comparison of results from different experiments. This work aims to provide guidance on which synchrony measure is best suited to quantify the effect of epileptiform-inducing substances (e.g., bicuculline, BIC) in in vitro neuronal spike train data. Spike train data from recordings are likely to suffer from erroneous spike detection, such as missed spikes (false negative) or noise (false positive). Therefore, different timescale-dependent (cross-correlation, mutual information, spike time tiling coefficient) and timescale-independent (Spike-contrast, phase synchronization (PS), A-SPIKE-synchronization, A-ISI-distance, ARI-SPIKE-distance) synchrony measures were compared in terms of their robustness to erroneous spike trains. For this purpose, erroneous spike trains were generated by randomly adding (false positive) or deleting (false negative) spikes (in silico manipulated data) from experimental data. In addition, experimental data were analyzed using different spike detection threshold factors in order to confirm the robustness of the synchrony measures. All experimental data were recorded from cortical neuronal networks on microelectrode array chips, which show epileptiform activity induced by the substance BIC. As a result of the in silico manipulated data, Spike-contrast was the only measure that was robust to false-negative as well as false-positive spikes. Analyzing the experimental data set revealed that all measures were able to capture the effect of BIC in a statistically significant way, with Spike-contrast showing the highest statistical significance even at low spike detection thresholds. In summary, we suggest using Spike contrast to complement established synchrony measures because it is timescale independent and robust to erroneous spike trains. KW - Neuronales Netz Y1 - 2020 U6 - https://doi.org/10.1162/neco_a_01277 VL - 32 IS - 3 SP - 1 EP - 25 ER - TY - CHAP A1 - Söthje, Dominik A1 - Wehnert, Gerd A1 - Schlachter, Herbert A1 - Bauer, Florian T1 - Neuartige Additive für Füllstoffe auf Carbon-Basis T2 - Nano goes Macro – Hybride Materialien, Nürnberg, 06.-07. November 2019, Tagungsband KW - Nanotechnologie KW - Kohlenstoff Y1 - 2019 ER - TY - JOUR A1 - Kefer, Stefan A1 - Sauer, Theresia A1 - Hessler, Steffen A1 - Kaloudis, Michael A1 - Schmauß, Bernhard A1 - Hellmann, Ralf T1 - Robust Polymer Planar Bragg Grating Sensors Embedded in Commercial-Grade Composites JF - Polymers N2 - This contribution demonstrates the functionality of polymer planar Bragg grating (PPBG) sensors integrated into commercial-grade carbon fiber reinforced polymer (CFRP) components. Multiple CFRP specimens are generated by curing a stack of pre-impregnated fibers inside of a heated mechanical press, exposing the polymer sensor to a pressure of 7 bar and a temperature of 120 °C for 2 h. After integration, the sensor still exhibits a strong and evaluable signal. Subsequent flexural experiments reveal a linear response of the integrated sensor’s Bragg wavelength to the CFRP specimen’s maximum deflection. Additional findings demonstrate that the embedded PPBG can be used to detect plastic deformations of a CFRP workpiece, whereas a linear correlation of plastic deformation to the resulting Bragg signal offset is determined. A plausibility check of the obtained results is delivered by a comparison of three-point flexural experiments on bulk CFRP workpieces, without integrated sensors and additional specimens featuring external optical sensors affixed to their surface. It is found that PPBGs based on cyclic olefin copolymers are able to overcome the temperature-related limitations of traditional polymer-based optical sensors and can thus be directly integrated into commercial-grade composites during production. KW - Bragg grating sensors KW - carbon fiber reinforced polymers KW - cyclic olefin copolymers KW - Bragg-Reflektor KW - Optischer Sensor Y1 - 2020 UR - https://www.mdpi.com/2073-4360/12/3/715/htm U6 - https://doi.org/10.3390/polym12030715 VL - 12 IS - 3 SP - 715 EP - 715 ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Reichert, Hannes A1 - Kreß, Viktor A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Trajectory Forecasts with Uncertainties of Vulnerable Road Users by Means of Neural Networks T2 - 2019 IEEE Intelligent Vehicles Symposium (IV) N2 - In this article, we present an approach to forecast trajectories of vulnerable road users (VRUs) including a numerical quantification of the uncertainty of the forecast. The uncertainty estimates are modeled as normal distributions by means of neural networks. Additionally, we present a method to evaluate the reliability of the forecasted uncertainty estimates, where we utilize quantile-quantile (Q-Q) plots, a graphical method to compare two distributions widely used in statistics. The positional accuracy is evaluated using Euclidean distances, in specific we use the average Euclidean error (AEE) and the average specific AEE (ASAEE). The model is trained and tested using a large dataset of 1311 cyclist trajectories, recorded at an urban intersection in real world traffic. Using this method, we achieve a similar positional accuracy compared to our previous work, where only positions are forecasted. The method is able to produce reliable uncertainty estimates for the motion types start, stop, turn left, and turn rightand produces underconfident uncertainty estimates for the motion types waitand move straight. Since uncertainties are not underestimated, the method can be used as a basis for trajectory planing in automated vehicles. KW - Fahrerassistenzsystem KW - Fahrrad KW - Autonomes Fahrzeug Y1 - 2019 U6 - https://doi.org/10.1109/IVS.2019.8814258 PB - IEEE CY - Paris, France ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Kreß, Viktor A1 - Sick, Bernhard A1 - Doll, Konrad T1 - Early Start Intention Detection of Cyclists Using Motion History Images and a Deep Residual Network T2 - 2018 IEEE Intelligent Vehicles Symposium (IV) N2 - In this article, we present a novel approach to detect starting motions of cyclists in real world traffic scenarios based on Motion History Images (MHIs). The method uses a deep Convolutional Neural Network (CNN) with a residual network architecture (ResNet), which is commonly used in image classification and detection tasks. By combining MHIs with a ResNet classifier and performing a frame by frame classification of the MHIs, we are able to detect starting motions in image sequences. The detection is performed using a wide angle stereo camera system at an urban intersection. We compare our algorithm to an existing method to detect movement transitions of pedestrians that uses MHIs in combination with a Histograms of Oriented Gradients (HOG) like descriptor and a Support Vector Machine (SVM), which we adapted to cyclists. To train and evaluate the methods a dataset containing MHIs of 394 cyclist starting motions was created. The results show that both methods can be used to detect starting motions of cyclists. Using the SVM approach, we were able to safely detect starting motions 0.506 s on average after the bicycle starts moving with an F 1 -score of 97.7%. The ResNet approach achieved an F 1- score of 100% at an average detection time of 0.144 s. The ResNet approach outperformed the SVM approach in both robustness against false positive detections and detection time. KW - Fahrerassistenzsystem KW - Radfahrer KW - Fußgänger Y1 - 2018 U6 - https://doi.org/10.1109/IVS.2018.8500428 PB - IEEE CY - Changshu, China ER - TY - JOUR A1 - Bieshaar, Maarten A1 - Zernetsch, Stefan A1 - Hubert, Andreas A1 - Sick, Bernhard A1 - Doll, Konrad T1 - Cooperative Starting Movement Detection of Cyclists Using Convolutional Neural Networks and a Boosted Stacking Ensemble JF - IEEE Transactions on Intelligent Vehicles N2 - In the future, vehicles and other traffic participants will be interconnected and equipped with various types of sensors, allowing for cooperation on different levels, such as situation prediction or intention detection. In this paper, we present a cooperative approach for starting movement detection of cyclists using a boosted stacking ensemble approach realizing feature- and decision-level cooperation. We introduce a novel method based on a three-dimensional convolutional neural network (CNN) to detect starting motions on image sequences by learning spatio-temporal features. The CNN is complemented by a smart device based starting movement detection originating from smart devices carried by the cyclist. Both model outputs are combined in a stacking ensemble approach using an extreme gradient boosting classifier resulting in a fast and yet robust cooperative starting movement detector. We evaluate our cooperative approach on real-world data originating from experiments with 49 test subjects consisting of 84 starting motions. KW - Fahrerassistenzsystem KW - Fahrrad KW - Sensortechnik Y1 - 2018 VL - 3 IS - 4 SP - 534 EP - 544 ER - TY - CHAP A1 - Reitberger, Günther A1 - Bieshaar, Maarten A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard A1 - Fuchs, Erich T1 - Cooperative Tracking of Cyclists Based on Smart Devices and Infrastructure T2 - 21st International Conference on Intelligent Transportation Systems (ITSC) 2018 N2 - In future traffic scenarios, vehicles and other traffic participants will be interconnected and equipped with various types of sensors, allowing for cooperation based on data or information exchange. This article presents an approach to cooperative tracking of cyclists using smart devices and infrastructure-based sensors. A smart device is carried by the cyclists and an intersection is equipped with a wide angle stereo camera system. Two tracking models are presented and compared. The first model is based on the stereo camera system detections only, whereas the second model cooperatively combines the camera based detections with velocity and yaw rate data provided by the smart device. Our aim is to overcome limitations of tracking approaches based on single data sources. We show in numerical evaluations on scenes where cyclists are starting or turning right that the cooperation leads to an improvement in both the ability to keep track of a cyclist and the accuracy of the track particularly when it comes to occlusions in the visual system. We, therefore, contribute to the safety of vulnerable road users in future traffic. KW - Fahrerassistenzsystem KW - Fahrrad KW - Sensortechnik Y1 - 2018 U6 - https://doi.org/10.1109/ITSC.2018.8569267 PB - IEEE CY - Maui, HI, USA ER - TY - CHAP A1 - Köhler, Sebastian A1 - Doll, Konrad A1 - Kebinger, Sophie A1 - Schmitt, Daniel A1 - Kröhn, Michael A1 - Fried, Maik A1 - Börsig, Rainer T1 - Gestenerkennung in einem hochautomatisiert lernenden Assistenzsystem für manuelle Montageprozesse T2 - AUTOMATION 2018, VDI-Berichte 2330 KW - Assistenzsystem KW - Montage Y1 - 2018 SN - 978-3-18-092330-7 SP - 145 EP - 156 CY - Baden-Baden ER - TY - CHAP A1 - Köhler, Sebastian A1 - Doll, Konrad A1 - Kebinger, Sophie A1 - Schmitt, Daniel A1 - Kröhn, Michael A1 - Fried, Maik A1 - Börsig, Rainer T1 - Prozessinnovation: Hochautomatisiert lernendes Assistenzsystem für die manuelle Montage N2 - Trotz hoher Automatisierungsgrade in der produzierenden Industrie, sind manuelle Montageprozesse durch den Menschen, sei es aufgrund der geforderten Flexibilität, insbesondere bei kleinen Losgrößen oder der erforderlichen Präzision, unverzichtbar. Um eine hohe Produktivität und niedrige Ausschussraten zu gewährleisten, ist es sinnvoll, den Menschen in seiner Montagetätigkeit zu unterstützen oder zu entlasten. Intelligente Assistenzsysteme können den Menschen dahingehend unterstützen, dass sie bspw. schwere Tätigkeiten kollaborativ übernehmen, Prozesse gezielt steuern oder Informationen bei Bedarf kontextsensitiv bereitstellen. In diesem Beitrag wird das Konzept eines intelligent hochautomatisiert lernenden Assistenzsystems vorgestellt, dessen Ziel es ist, anhand von bereits gelernten Abläufen an einem manuellen Montagearbeitsplatz fehlerhafte Abläufe zu erkennen oder neue valide Abläufe hochautomatisiert und unüberwacht zu lernen. Manuelle Montageprozesse bestehen aus Abfolgen von Handgriffen. Diese Handgriffe werden vom Assistenzsystem als Gesten erkannt und verarbeitet, sodass der Gesamtablauf in Teilschritte zerlegt werden kann. Weiterhin soll dieses Assistenzsystem Informationen zur Behebung des Fehlers direkt am Arbeitsplatz verfügbar machen. Das Assistenzsystem, dessen Architektur in Abb. 1 dargestellt ist, besteht aus einem zustandsgesteuerten, lernenden Steuersystem mit einem Microsoft Kinect-v2-Sensor, der den Arbeitsplatz aus der Überkopfperspektive erfasst und die Montageschritte erkennt. Da das Grundprinzip des Assistenzsystems in der Langzeitbeobachtung und –unterstützung der Montagetätigkeit liegt, werden die kontinuierlich aggregierten Daten zur Erweiterung und Verbesserung des Assistenzsystems genutzt. Es lernt somit hochautomatisiert neue oder abgewandelte Montageabläufe. Hieraus ergibt sich eine Herausforderung an die Bewertung der Güte eines solchen Systems. Während eine hohe Erkennungsrate der einzelnen Aktivitäten innerhalb eines Montageablaufs unabdingbar ist, wird für das vorgeschlagene System darüber hinaus gefordert, dass komplette Abläufe korrekt, d.h. in der richtigen Reihenfolge ohne einzelne Falschklassifikationen, erkannt werden. Nur hierdurch lassen sich real geänderte Abläufe hochautomatisiert und unüberwacht im Zustandsautomat des Steuersystems online einlernen. T2 - Konferenz für Angewandte Automatisierungstechnik in Lehre und Entwicklung (AALE), 2018 KW - Automatisierungstechnik KW - Montage Y1 - 2018 SN - 978-3-8007-4522-7 SP - 153 EP - 164 CY - Köln ER - TY - CHAP A1 - Kefer, Stefan A1 - Rosenberger, Manuel A1 - Hessler, Steffen A1 - Girschikofsky, Maiko A1 - Belle, Stefan A1 - Roth, Gian-Luca A1 - Schmauß, Bernhard A1 - Hellmann, Ralf T1 - Fabrication and Applications of Polymer Planar Bragg Grating Sensors based on Cyclic Olefin Copolymers T2 - 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) N2 - This contribution reviews recent advancements, current research and possible applications of polymer planar Bragg grating (PPBG) sensors with a focus on the utilization of cyclic olefin copolymer (COC) substrates. COC-PPBGs can be handled and fabricated efficiently by employing a single writing step procedure which features simultaneous generation of waveguide and Bragg grating structure within an injection molded substrate. The resulting photonic structures exhibit an attenuation as low as 1.2 dB cm-1 and a reflectivity up to 99 %. The potential of COC-PPBGs for high-temperature applications is proven by demonstrating temperature measurements up to 160 °C. Moreover, it is possible to employ single PPBGs for multidimensional stress and strain sensing or even three-dimensional shape reconstruction. Due to their excellent properties, it is feasible to integrate COC-PPBGs into commercial-grade carbon fiber reinforced polymer workpieces for structural health monitoring. Furthermore, utilization of appropriate coatings enables functionalization of PPBGs for refractive index sensing and thus biochemical applications. Beside the fabrication and characterization of COC-based PPBGs, this contribution exemplifies and reviews such applications. KW - Bragg gratings , Gratings , Optical waveguides , Temperature sensors , Substrates KW - Optischer Sensor KW - Bragg-Reflektor Y1 - 2020 UR - https://ieeexplore.ieee.org/document/9021801 SN - 978-1-7281-5304-9 U6 - https://doi.org/10.1109/PIERS-Fall48861.2019.9021801 SP - 647 EP - 655 PB - Institute of Electrical and Electronics Engineers ER - TY - THES A1 - Rung, Stefan T1 - Laserinduzierte hierarchische Oberflächenstrukturen und deren Anwendungen KW - Laser KW - Oberflächenstruktur Y1 - 2019 UR - https://nbn-resolving.org/urn:nbn:de:hbz:294-68921 U6 - https://doi.org/https://doi.org/10.13154/294-6892 ER - TY - CHAP A1 - Kreß, Viktor A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Pose Based Trajectory Forecast of Vulnerable Road Users T2 - IEEE Symposium Series on Computational Intelligence (SSCI) N2 - In this article, we investigate the use of 3D human poses for trajectory forecasting of vulnerable road users (VRUs), such as pedestrians and cyclists, in road traffic. The forecast is based on past movements of the respective VRU and an important aspect in driver assistance systems and autonomous driving, which both could increase VRU safety. The 3D poses represent the entire body posture of the VRUs and can therefore provide important indicators for trajectory forecasting. In particular, we investigate the influence of different joint combinations and input sequence lengths of past movements on the accuracy of trajectory forecasts for pedestrians and cyclists. In addition, we divide VRU movements into the motion types wait, start, move, and stop and evaluate the results separately for each of them. Comparing it to an existing, solely head based trajectory forecast, we show the advantages of using 3D poses. With an input sequence length of 1.0 s, the forecasting error is reduced by 17.9 % for starting, 8.18 % for moving, and 11.0 % for stopping cyclists. For pedestrians, the error is reduced by 6.93 %, 2.73 %, and 5.02 %, respectively. With shorter input sequences, the improvements over the solely head based method remain for cyclists and even increase for pedestrians. KW - Fahrerassistenzsystem KW - Fußgänger KW - Radfahrer Y1 - 2019 U6 - https://doi.org/10.1109/SSCI44817.2019.9003023 VL - 2019 SP - 1200 EP - 1207 PB - IEEE CY - Xiamen, China ER - TY - JOUR A1 - Keller, Oxana A1 - Pedell, Burkhard A1 - Rötzel, Peter A1 - Tondock, Roy T1 - Risikoorientiertes Regulierungscontrolling bei Stromnetzbetreibern im Kontext der Anreizregulierung JF - Betriebswirtschaftliche Forschung und Praxis N2 - Die Ausgestaltung des Regulierungssystems hat einen wesentlichen Einfluss auf die Geschäftsstrategie und die Funktionsbereiche von regulierten Unternehmen. Besonders deutlich zeigt sich dies bei einem vollständigen Systemwechsel, wie er kürzlich mit der Einführung der Anreizregulierung in der deutschen Stromwirtschaft vollzogen wurde. Der vorliegende Beitrag untersucht die Auswirkungen auf die regulierten Unternehmen auf Basis einer Befragung und zeigt auf, dass der Wechsel des Regulierungssystems zu deutlichen Reaktionen hinsichtlich Risikoeinschätzung, Geschäftsstrategie und Investitionsverhalten geführt hat. Besonders starken Veränderungen sind die Funktionsbereiche Regulierungsmanagement und Controlling unterworfen. Aufbauend auf diesen empirischen Ergebnissen entwickelt der Beitrag Ansätze für ein risikoorientiertes Regulierungscontrolling. KW - Elektrizitätswirtschaft KW - Regulierung KW - Anreiz Y1 - 2013 VL - 65 IS - 4 SP - 339 EP - 356 ER - TY - JOUR A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - Studie "Auswirkungen der Anreizregulierung auf die deutsche Elektrizitätswirtschaft", Energiewirtschaftliche Tagesfragen JF - Controlling KW - Elektrizitätswirtschaft KW - Regulierung KW - Anreiz Y1 - 2010 VL - 60 IS - 1 SP - 38 EP - 41 ER - TY - JOUR A1 - Christian, Lohmann A1 - Rötzel, Peter T1 - Welchen Einfluss nehmen öffentliche Anteilseigner auf Public Private Partnerships? Eine empirische Untersuchung von PPP in der Bundeswehr JF - Tagungsband zum Dortmunder Forum Technisches Management N2 - Der vorliegende Beitrag untersucht den Einfluss des öffentlichen Anteilseigners auf gemischtwirtschaftliche Public Private Partnerships, welche die staatliche Durchführung von öffentlichen Aufgaben durch die Bereitstellung von notwendigen Gütern und Dienstleistungen unterstützen. Die empirische Analyse bezieht sich auf Public Private Partnerships des Bundesministeriums der Verteidigung. Diese Public Private Partnerships sind dadurch gekennzeichnet, dass der öffentliche Anteilseigner gleichzeitig als öffentlicher Auftraggeber auftritt. Zunächst wird gezeigt, dass die staatliche Institution als öffentlicher Anteilseigner das Zielsystem in Bezug auf die monetären Ziele maßgeblich bestimmt. Für die Public Private Partnerships ist demnach die Kostenminimierung und nicht die von den privaten Anteilseignern eingeforderte Gewinnmaximierung das wichtigste monetäre Ziel. Die staatliche Institution unterbindet durch die Beeinflussung der monetären Ziele einer Public Private Partnerhip das opportunistische Verhalten in Bezug auf das Entgelt für die zu erbringende Leistung. Im Vergleich zu einer rein privatwirtschaftlichen Erfüllung von öffentlichen Aufträgen ist die Etablierung von Public Private Partnerships eine Möglichkeit, das Kapital, die Kompetenz sowie die wirtschaftliche Effizienz von privaten Wirtschaftssubjekten zu nutzen, ohne die Transaktionskosten durch eine opportunistische Entgeltgestaltung maßgeblich zu erhöhen. KW - Public Private Partnership KW - Deutschland, Bundeswehr Y1 - 2011 U6 - https://doi.org/https://doi.org/10.1007/978-3-658-02429-1_4 VL - 2011 IS - 2 SP - 293 EP - 303 ER - TY - JOUR A1 - Rötzel, Peter A1 - Kokott, Peter T1 - Controlling des Ideenmanagements: Ex Ante Determinierung oder Ex Post Intervention? JF - Zeitschrift für Ideenmanagement KW - Vorschlagswesen Y1 - 2008 VL - 34 IS - 2 SP - 35 EP - 40 ER - TY - JOUR A1 - Abel, Stephan A1 - Rötzel, Peter T1 - Organisationsentwicklung und Restrukturierung des Controllings in der Luftwaffe JF - Controller Magazin KW - Deutschland, Luftwaffe KW - Controlling Y1 - 2011 UR - https://www.haufe.de/download/controller-magazin-ausgabe-42011-controller-magazin-118814.pdf VL - 2011 IS - 4 SP - 83 EP - 89 ER - TY - JOUR A1 - Rötzel, Peter A1 - Kokott, Peter T1 - Das Konzept der Relativen Ideen-Stärke. Erfolgreiches und effektives Benchmarking von Ideenmanagement-Systemen JF - Zeitschrift für Ideenmanagement N2 - Die Relative Ideen-Stärke (RIS) stellt ein effektives und ganzheitliches Benchmarking-System dar, das den größenunabhängigen Vergleich von verschiedenen Ideenmanagement-Systemen erlaubt. Hierbei werden neben direkten quantitativen Performance-Werten auch prozessuale und systemische Qualitätsunterschiede integriert. Aufbauend auf dem dib-Punktesystem stellt das Konzept der Relativen Ideen-Stärke eine querschnittliche Betrachtung an, welche die Nutzung als diagnostisches und analytisches Controlling-Instrument erlaubt. In Verbindung mit dem Ideenmanagement Report des Deutschen Instituts für Betriebswirtschaft stellt die Relative Ideen-Stärke ein ebenso anwendungsfreundliches wie praxisnahes Instrument für das Ideenmanagement dar. Der berechnete Benchmark ist statistisch hoch signifikant, innovativ und führend für den deutschsprachigen Raum. KW - Vorschlagswesen KW - Benchmarking Y1 - 2009 VL - 35 IS - 3 SP - 81 EP - 85 ER - TY - JOUR A1 - Rötzel, Peter T1 - Mitarbeiterbefragungen als Instrument des Controlling?! JF - Controller Magazin KW - Mitarbeiter KW - Umfrage KW - Controlling Y1 - 2009 UR - https://www.haufe.de/download/controller-magazin-ausgabe-62009-controller-magazin-118748.pdf VL - 2009 IS - 6 SP - 71 EP - 78 ER - TY - JOUR A1 - Kokott, Peter A1 - Rötzel, Peter T1 - Slots - Flaschenhals des Luftverkehrs, Anreize und Regulierungsökonomie JF - Zeitschrift für Verkehrswissenschaften N2 - Der Flugverkehr entwickelt sich in rasantem Tempo. Immer mehr Menschen nutzen das Flugzeug, um ihre Mobilitätsbedürfnisse zu befriedigen. Insbesondere seit Flugreisen durch Low-Cost-Carrier für jedermann erschwinglich geworden sind, nimmt der Luftverkehr stetig zu. Die Infrastruktur am Boden kann hier seit Jahren nicht mehr mithalten. Slots – die Lande- und Startnischen für Flugzeuge – sind insbesondere an großen internationalen Flughäfen zur Mangelware geworden. Stetig drängen neue Airlines in den europäischen Luftraum und beanspruchen ihren Platz als Luftverkehrsdienstleister – und erhöhen damit die Nachfrage nach Slots. Gleichzeitig werden Restriktionen und protektionistische Regelungen im Luft- verkehr gelockert (vgl. z.B. Open Skies). Die Erkenntnis, dass der Luftverkehr zum Kitt der Globalisierung geworden ist, hat sich in den Köpfen der Menschen längst durchgesetzt. Das Hauptproblem besteht also im Kapazitätsengpass bei Slots und bei der Abfertigung der Flugzeuge am Boden. Der derzeitige Vergabemechanismus für Slots wurde in einer Zeit etabliert, in der vollständig regulierte Flughäfen die Ausnahme darstellten. Heutzutage sind vollständig regulierte bzw. partiell vollständig regulierte Flughäfen zur Regel geworden. Das Slot-Grandfathering vermag den heutigen Anstieg des Luftverkehrs nicht adäquat zu bewältigen. KW - Slot, Luftverkehr Y1 - 2009 UR - https://cutt.ly/trGJYWi VL - 80 IS - 1 SP - 63 EP - 76 ER - TY - JOUR A1 - Rötzel, Peter T1 - Controlling durch Evaluationen, Präzise Instrumente zum Controlling und Optimierung des Ideenmanagements JF - Zeitschrift für Ideenmanagement N2 - Das Ideenmanagement im Unternehmen ist kein statischer Prozess, sondern entwickelt sich, ebenso wie das Unternehmen, weiter. Dies geschieht nicht nur strukturell oder organisatorisch, sondern auch in der Köpfen der Mitarbeiter. Um die Mitarbeiter – die entscheidende Ressource des Ideenmanagements – nicht zu verlieren, können Evaluationen hilfreich sein. Sie ermöglichen eine Analyse der vielschichtigen Bewertungsebenen der Mitarbeiter und ihrer tatsächlichen Haltung zum Ideenmanagement. Dies ermöglicht ein wirksames Controlling des Ideenmanagements und der Innovation im Unternehmen. Die Nutzung des Instrumentes Evaluation für das Ideenmanagement anzuregen, ist Ziel dieses Aufsatzes. KW - Vorschlagswesen KW - Innovationsmanagement Y1 - 2009 UR - https://cutt.ly/arGJU20 VL - 35 IS - 1 SP - 12 EP - 16 ER - TY - JOUR A1 - Rötzel, Peter A1 - Kokott, Peter T1 - Ökonomische Bewertung und wirtschaftliches Verhalten des Krankenhauspersonals: Liegt den täglichen Entscheidungen im Gesundheitssektor ökonomisches Verständnis zugrunde? JF - Zeitschrift für Gesundheitsökonomie und Qualitätsmanagement N2 - Zielsetzung: Die Bewertung ökonomischer Effizienzmechanismen des Krankenhauspersonals unterscheidet sich von anderen Berufs- und Bevölkerungsgruppen grundlegend. Inwiefern dies Auswirkungen auf die Bereitschaft zur Effizienzsteigerung und Kosteneinsparung hat, ist Gegenstand dieser Untersuchung. Methodik: Im Zuge der Untersuchung wurden in einer zweistufigen Evaluation die Mitarbeiter quantitativ und die Führungs- und Funktionskräfte im Rahmen eines qualitativen Leitfadeninterviews befragt. Ergebnisse: Die Grundeinstellung von Krankenhausmitarbeitern ist tendenziell negativ gegenüber ökonomischen Lösungsmechanismen. Soziale Verteilungslösungen werden preislichen Allokationsverfahren vorgezogen. Schlussfolgerungen: Das Personal des Krankenhausbereichs denkt anders, insbesondere in der wesentlichen Frage der Bewertung ökonomischer Effizienz. Dabei scheint die „Nähe” zum Patienten eine entscheidende Rolle zu spielen. Je stärker ein Mitarbeiter direkt mit Patienten arbeitet (Pflegedienst, Ärztlicher Dienst) desto altruistischer und gruppendynamischer ist seine Grundeinstellung. Hierbei werden soziale Aspekte, Anerkennung und Zufriedenheit weitaus stärker gewichtet als die monetäre Dimension. Mitarbeiter des Verwaltungsbereiches besitzen eine weitaus positivere Einstellung ökonomischen Effizienzmechanismen gegenüber. KW - Wirtschaftlichkeit KW - Krankenhaus KW - Krankenhauspersonal Y1 - 2008 UR - https://cutt.ly/OrGKEQn VL - 13 IS - 4 SP - 216 EP - 220 ER - TY - JOUR A1 - Rötzel, Peter A1 - Kokott, Peter T1 - Ideenmanagement in Krankenhäusern JF - Zeitschrift für Ideenmanagement N2 - Das Gesundheitswesen ist einem kontinuierlichen Wandel unterworfen. Knapper werdende Mittel im Gesundheitsbereich zwingen Krankenhäuser zu einer stetigen Effizienzsteigerung. Fluktuierende Rahmenbedingungen erfordern ein hohes Maß an Flexibilität. Innovation und Rationalisierung bestimmen das Vokabular der Mitarbeiter. Dabei geht es nicht um die Maximierung des Gewinns, sondern in vielen Bereichen um das Überleben eines Krankenhauses. Was sich der soziale Bereich nicht leisten kann, ist der Verzicht auf die Ideen seiner Mitarbeiter. Konventionelles, in der Industrie verwurzeltes Ideenmanagement lässt sich nicht einfach auf den Krankenhausalltag übertragen. Dieser Beitrag bietet eine Analyse des ökonomischen Denkens von Krankenhauspersonal. KW - Vorschlagswesen KW - Innovationsmanagement KW - Krankenhaus Y1 - 2007 UR - https://cutt.ly/trGJPDR VL - 33 IS - 4 SP - 111 EP - 113 ER - TY - JOUR A1 - Rötzel, Peter T1 - It's a kind of MAGIC: Eine hedonische Preisanalyse für Trading Cards JF - WiSt N2 - Sammelkartenspiele wie MAGIC, haben in den letzten Jahren einen enormen Anstieg der Nachfrage erfahren. So wurde zur Kinotrilogie „Der Herr der Ringe“ gleichzeitig auch ein Sammelkartenspiel herausgegeben. Ein Sammelkartenspiel wird mit einer beliebigen durch den Spieler getroffenen Kartenauswahl gespielt. Sammelkartenspiele, wie auch MAGIC, kombinieren Sammelkarten mit einem Strategiespiel. Bei Spielen solcher Art haben die Sammelkarten auch einen gewissen Spielwert. KW - Preisanalyse KW - Sammelbild KW - Spiel Y1 - 2006 U6 - https://doi.org/https://doi.org/10.15358/0340-1650-2006-9-529 VL - 35 IS - 9 SP - 529 EP - 532 ER - TY - JOUR A1 - Luther, Ricardo A1 - Rötzel, Peter T1 - Handyauktionen bei eBay - Eine hedonische Preisanalyse und ein Vergleich mit unverbindlichen Herstellerpreisen JF - WiSt N2 - Der Besitz eines Handys ist heutzutage als Standard für Jedermann zu sehen. Geht es jedoch darum, die Zahlungsbereitschaft des Einzelnen beim Kauf für dieses Gut zu messen, und daraus schließend die Wertschätzung für einzelne Charakteristika des Handys, so gibt es verschiedene Ansätze, dies zu analysieren. KW - Handy KW - Smartphone KW - Preisanalyse Y1 - 2010 U6 - https://doi.org/https://doi.org/10.15358/0340-1650-2010-7-341 VL - 39 IS - 7 SP - 341 EP - 348 ER - TY - JOUR A1 - Rötzel, Peter T1 - Risikoorientiertes Projektcontrolling JF - Controlling N2 - Das Projektcontrolling ist fester Bestandteil eines erfolgreichen Projektmanagements geworden (vgl. Schreckenender, 2010). Selbst bei kleineren Einzelprojekten, für die kein eigener Projektcontroller zur Verfügung steht, werden die mit dem Projektcontrolling verbunden Aufgaben oftmals vom Projektmanager selbst wahrgenommen. Dies zeigt, wie hoch die Bedeutung eines erfolgreichen Projektcontrollings für den Gesamterfolg des Projektes ist. KW - Projektcontrolling Y1 - 2010 U6 - https://doi.org/https://doi.org/10.15358/0935-0381-2010-12-687 VL - 22 IS - 12 SP - 687 EP - 689 ER - TY - JOUR A1 - Rötzel, Peter T1 - Gesundheitscontrolling JF - Controlling N2 - Die Entwicklung von mitarbeiterfokusierten Controllingansätzen insbesondere im Personalcontrolling wurde durch die Balanced Scorecard mit ihrer Lern- und Entwicklungsperspektive nachhaltig gefördert. Die steigende Bedeutung spiegelt sich auch in der zunehmenden Berücksichtigung in Kennzahlen- und Personalinformationssystemen wider (vgl. Günther et al., 2009; Brandl, 2002). Hierbei spielt vor allem die hohen Korrelation von krankheitsbedingter Abwesenheit auf Kennzahlen wie Arbeitszufriedenheit, Mitarbeitermotivation oder Produktivität eine wesentliche Rolle. KW - Personalcontrolling Y1 - 2011 U6 - https://doi.org/https://doi.org/10.15358/0935-0381-2011-12-657 VL - 23 IS - 12 SP - 657 EP - 659 ER - TY - JOUR A1 - Rötzel, Peter T1 - Wertorientiertes Beteiligungscontrolling JF - Controlling N2 - Die Unternehmenslandschaft ist in zunehmenden Maße von Dezentralisierung, Outsourcing und Vernetzung gekennzeichnet. Dies wird vor allem im Trend hin zu stärkeren Beteiligungen in entscheidenden Bereichen der Wertschöpfungskette deutlich, wie beispielsweise im Rahmen von Beteiligungen an Zulieferunternehmen. Diese Entwicklung auf Unternehmensebene wird begleitet von einer starken Fokussierung der Controlling-Elemente in den Unternehmen auf Fragestellungen der Steuerung von Beteiligungen. Hier spielen vornehmlich die Zusammenarbeit von Zentralcontrolling und dem Controlling in einzelnen Bereichen und Beteiligungen sowie die Einbindung in die Konzernstrategie eine Rolle (vgl. Sieber et al., 2009; Littkemann, 2009). Der Vorteil von Beteiligungen gegenüber Fusionen liegt vornehmlich in dem geringen Kapitalbedarf, da bei Beteiligungen ein einfacher Mehrheitsanteil genügt und das Zielunternehmen nicht vollständig gekauft werden muss. Weitere Anwendungsfälle sind Joint Ventures, also die Gründung einer Tochtergesellschaft durch mindestens zwei rechtlich und wirtschaftlich getrennte Unternehmensmütter, sowie Public Private Partnerships. KW - Unternehmensbeteiligung KW - Controlling Y1 - 2012 U6 - https://doi.org/https://doi.org/10.15358/0935-0381-2012-4-5-272 VL - 24 IS - 4/5 SP - 272 EP - 274 ER - TY - JOUR A1 - Rötzel, Peter T1 - Einfluss von Vorgesetzten, Tätigkeit, Arbeitsbedingungen und variabler Besoldung auf die Motivation von Mitarbeitern im öffentlichen Dienst JF - Journal of Business Economics N2 - This paper analyses the effects of four main influence factors on motivation of public personnel. These influence factors are “superior”, “job satisfaction”, “work environment”, and “variable wages”. I analyse the four factors by using a structural equation model with empirical data. My focus lies on the complex interdependencies of influence factors among each other. There is empirical evidence that the influence factor “job satisfaction” plays a decisive role in public service motivation. Moreover, the influence factors “work environment” and “variable wage” have a quite low direct effect on motivation. Surprisingly, the influence factor “superior” has an strong effect on “job satisfaction” and on “variable wages”. KW - Arbeitsmotivation KW - Öffentlicher Dienst Y1 - 2012 U6 - https://doi.org/10.1007/s11573-012-0592-x VL - 82 IS - 7/8 SP - 807 EP - 838 ER - TY - JOUR A1 - Haupenthal, Markus A1 - Pedell, Burkhard A1 - Rötzel, Peter T1 - Verknüpfung von Ideen- und Innovationsmanagement: Empirische Untersuchung der Performance-Wirkung und Ableitung von Gestaltungsansätzen JF - Controlling N2 - Der Beitrag stellt mögliche Vor- und Nachteile einer Verknüpfung von Ideen- und Innovationsmanagement gegenüber und zeigt anhand einer empirischen Analyse die Auswirkungen dieser Verknüpfung auf zentrale Performance-Maße des Ideenmanagements. Des Weiteren wird eine mögliche Ausgestaltung der Schnittstelle zwischen Ideen- und Innovationsmanagement entwickelt und diskutiert. KW - Innovationsmanagement KW - Vorschlagswesen Y1 - 2013 U6 - https://doi.org/https://doi.org/10.15358/0935-0381_2013_3_150 VL - 25 IS - 3 SP - 150 EP - 157 ER - TY - JOUR A1 - Rötzel, Peter A1 - Schnell, Tomas T1 - Kennzahlenbasierte Steuerung des Ideenmanagements in deutschen Unternehmen: Einfluss auf die Leistungsfähigkeit von Zielvereinbarungen JF - Controlling N2 - Der vorliegende Beitrag untersucht empirisch den Einfluss von Zielvereinbarungen auf die Leistungsfähigkeit des Ideenmanagements in deutschen Unternehmen mittels Korrelations-analyse und Kleinst-Quadrate-Regression. Es zeigt sich, dass auf die Bedürfnisse des Ideen-managements abgestimmte Zielvereinbarungen auf der mittleren Managementebene einen deutlich stärkeren positiven Einfluss auf die Performance des Ideenmanagements haben als die Höhe des Prämiensatzes. KW - Management by Objectives KW - Vorschlagswesen Y1 - 2013 U6 - https://doi.org/https://doi.org/10.15358/0935-0381_2013_3_138 VL - 25 IS - 3 SP - 138 EP - 143 ER - TY - JOUR A1 - Lohmann, Christian A1 - Rötzel, Peter T1 - Einfluss des öffentlichen Anteilseigners auf Public Private Partnerships: Eine empirische Untersuchung am Beispiel der Public Private Partnerships der Bundeswehr JF - Journal of Business Economics N2 - The present article analyzes the influence of the public shareholder on public–private partnerships (PPPs) that support public projects by supplying essential goods and services. The empirical analysis examines public–private partnerships involving the German Federal Ministry of Defense. The main characteristic of these PPPs is the dual role of the German Federal Ministry of Defense, which appears simultaneously as public shareholder and public purchaser. The paper shows that the government institution decisively determines monetary objectives and consequently the entire system of objectives. The most important monetary objective of PPPs is cost minimization, in contrast to profit maximization, which is commonly the objective of private shareholders. By determining the monetary objectives of such partnerships, the government institution prevents the opportunistic behavior of PPPs with regard to the level of charges for goods and services, which is commonly part of renegotiations if the government institution changes the demand for goods and services. Compared to wholly government-funded public projects, PPPs offer an opportunity to use the capital, competence and economic efficiency of private economic subjects without increasing the transaction costs commonly associated with the opportunistic behavior exhibited by PPPs with regard to the level of charges. KW - Public Private Partnership KW - Deutschland, Bundeswehr Y1 - 2013 U6 - https://doi.org/10.1007/978-3-658-02429-1_4 VL - 2013 IS - 2 SP - 71 EP - 88 ER - TY - JOUR A1 - Krauße, Sylvana A1 - Schneider-Störmann, Ludger A1 - Döhring, Thorsten T1 - ITV– international studieren in Aschaffenburg JF - Die Neue Hochschule N2 - Die Wettbewerbsfähigkeit der Exportnation Deutschland erfordert hervorragend ausgebildete Vertriebsingenieurinnen und -ingenieure. Dieses Ausbildungsziel verfolgt der Studiengang „Internationales Technisches Vertriebsmanagement“ an der Technischen Hochschule Aschaffenburg. KW - Internationalisierung KW - Hochschule KW - Vertrieb KW - Vertriebsingenieur KW - Hochschule Aschaffenburg Y1 - 2019 UR - https://hlb.de/die-neue-hochschule VL - 2019 IS - 6 SP - 16 EP - 19 ER - TY - CHAP A1 - Pareschi, Giovanni A1 - Civitani, Marta Maria A1 - Sironi, Giorgia A1 - Yang, Yang A1 - Cotroneo, Vincenzo A1 - Valsecchi, Giuseppe A1 - Magagnin, Luca A1 - Döhring, Thorsten A1 - Bradshaw, Miranda A1 - Burwitz, Vadim A1 - Pelliciari, Carlo T1 - Reflectivity-enhancement at low x-ray energies in astronomical telescopes using low-density overcoatings: alternative materials and deposition methods T2 - Proceedings of SPIE N2 - Low density overcoatings (mainly based on materials containing Carbon) onto usual high-density coatings (based i.e. on materials like e.g. like Ir, Au or Pt) have been proposed since many years ago in order to enhance the X- ray reflectivity at low energy (between 0.5 and 4 keV) of X-ray astronomical optics. The trick is to make use of the total reflection from the thin low-density material (which does not suffer much the photoelectric absorption) at low X-ray energies; the reflection of photons at higher energies (< 4 keV) occurs thanks to the much denser material under the overcoating. For several future projects, like e.g. ATHENA, LYNX and eXTP, it is foreseen the use of low-density overcoatings that will importantly increase the effective area at low X-ray energies. In this paper we will introduce the use of overcoatings based on materials different from the usual ones considered so far like C, B4C and SiC. In particular, we will discuss about a novel approach based on the use of thin layer of a Carbon-like materials deposited using a dip coating method. A possible combination with an intermediate thin layer of Chromium deposited e.g. via sputtering onto the usual high density material (Ir, Au or Pt) before the application of the Carbon-like material is also considered in the study, because it can further greatly enhance the soft X-ray effective area of future X-ray telescopes. KW - coating KW - X-ray KW - telescope KW - iridium KW - Röntgenteleskop Y1 - 2019 U6 - https://doi.org/https://doi.org/10.1117/12.2532392 VL - 2019 IS - 11119 SP - 11119OS-1 EP - 11119OS-13 PB - SPIE ER - TY - PAT A1 - Speit, Burkard A1 - Wolff, Silke A1 - Döhring, Thorsten T1 - Lead-containing space glass, its production and use KW - Optisches Glas KW - Raumfahrt Y1 - 2009 ER - TY - PAT A1 - Speit, Burkard A1 - Wolff, Silke A1 - Döhring, Thorsten T1 - Lead-containing space glass, its production and use KW - Optisches Glas KW - Raumfahrt Y1 - 2009 ER - TY - PAT A1 - Schäfer, Martin A1 - Döhring, Thorsten A1 - Seibert, Volker A1 - Westerhoff, Thomas A1 - Nowak, Hans-Joachim T1 - Substrate for a mirror support with reduced weight as well as mirror with reduced-weight mirror support KW - Spiegeloptik Y1 - 2008 ER - TY - PAT A1 - Döhring, Thorsten A1 - Mitra, Ina T1 - Optical glass comprises oxides of e. g. aluminum, boron, phosphorus, tin, zirconium, potassium and cesium, and coloring oxides, for production of very large opitcal transmission components, e.g. lenses, prisms, or windows KW - Optisches Glas Y1 - 2004 ER - TY - PAT A1 - Döhring, Thorsten A1 - Mitra, Ina T1 - Large transmissive optical component KW - Optisches Bauelement Y1 - 2003 ER - TY - JOUR A1 - Jost, Thomas A1 - Toedter, Karl-Heinz T1 - Eine neue Fiskalregel für die Eurozone: einfach, transparent, kontrollierbar JF - List-Forum für Wirtschafts- und Finanzpolitik KW - Eurozone, Maastricht-Kriterien, Staatsverschuldung, Fiskalregeln, Stabilitäts- und Wachstumspakt KW - Geldpolitik KW - Eurozone Y1 - 2020 U6 - https://doi.org/10.1007/s41025-019-00183-y VL - 45 IS - 4 SP - 381 EP - 395 ER - TY - PAT A1 - Döhring, Thorsten T1 - Component made of lithium-alumino-silicate glass ceramic KW - Glaskeramik Y1 - 2002 ER - TY - PAT A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Esemann, Hauke A1 - Hölzel, Eva T1 - Process for forming glass or glass ceramic and for making suitable mould KW - Glas KW - Glaskeramik Y1 - 2002 ER - TY - PAT A1 - Döhring, Thorsten T1 - Calibration body for computer controlled machine tools etc. in the form of a frame of speres and separation elements produced form glass, ceramic or metallic alloys to provide high measurement tolerances KW - Werkzeugmaschine KW - Kalibrieren, Messtechnik Y1 - 2001 ER - TY - PAT A1 - Döhring, Thorsten T1 - Spacing element for a fixing device for components of optical and/or precise mechanical superstructures KW - Abstandshalter Y1 - 1999 ER - TY - CHAP A1 - Jahn, Sabrina A1 - Gold-Veerkamp, Carolin A1 - Reuter, Rebecca A1 - Mottok, Jürgen A1 - Abke, Jörg T1 - Secure Software Engineering in Academic Education: Students' Preconceptions of IT Security T2 - Proceedings of the 12th annual International Conference of Education, Research and Inno-vation (ICERI) 2019 N2 - Over the last years, IT Security has slowly found its way into teaching in higher education. It is becoming increasingly important to integrate knowledge about the development of secure systems (secure software engineering) into academic teaching. However, teaching security and secure software engineering to non-computer-scientists is rare. Therefore, we focus our research on the integration of IT Security into software engineering education of non-computer scientists, particularly electrical engineers, by means of inductive teaching- and learning-arrangements. As a prerequisite for inductive teaching, our paper deals with engineering and computer science students’ preconceptions of the topics IT Security and secure software engineering to identify learning contents and corresponding teaching methods to improve academic learning and teaching in both areas in the future. To identify those preconceptions, we conducted guided interviews with freshmen of engineering and computer science studies from different German Universities of Applied Sciences, containing questions about what they have heard about the topic of IT Security. The interviews were coded according to the coding process of the Grounded Theory Method of Corbin and Strauss [1], with focus on open and axial coding. The goal was to derive a first catalogue of students’ preconceptions according to IT Security and secure software engineering. We present the first version of the catalogue in the paper. KW - Software Engineering KW - Computersicherheit Y1 - 2019 SN - 978-84-09-14755-7 SP - 6825 EP - 6834 ER - TY - CHAP A1 - Klopp, Marco T1 - Teaching Generic Competences in Software Engineering via E-Learning T2 - International Conference on Teaching, Assessment and Learning for Engineering (TALE) N2 - The discipline ‘Software Engineering’ is difficult to represent in higher education, because of the complexity of software development projects and the variety of skills required. In addition to specialist skills (professional competences), generic competences are increasingly becoming the focus of education. This paper deals with the training of generic competences in the software engineering module. For this purpose, an existing didactic concept was enhanced by E-Learning with the help of a Moodle course. KW - E-Learning KW - Software Engineering Y1 - 2019 SP - 758 EP - 765 ER - TY - CHAP A1 - Degener, Pascal A1 - Haak, Valentin A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg T1 - Towards the Vision of an LMS Integrated, Browser-Based Simulation to Program LEGO MindStorms EV3s in ANSI-C T2 - 2019 IEEE Global Engineering Education Conference (EDUCON) N2 - In the practical Computer Science lessons at our University of Applied Sciences the students (Bachelor of Engineering in Mechatronics as well as Electrical Engineering and Information Technology) learn the programming language ANSI-C during the curriculum. 2015 the LEGO MindStorms EV3 robots were integrated into this lessons. Looking at this teaching & learning arrangement, the evaluations showed, a higher level of undergraduates’ motivation, more fun, and more practical relevance, but also some challenges; for instance the problem that the robots are only available in the lab during opening hours. Therefore, a transformer was developed to run an existing EV3 simulation. The plan is now to use a plugin for integrating this option into the Integrated Development Environment Eclipse as an intermediate stage. In the long term, several developments shall be combined to build a browser-based development environment for programming EV3 robots as well as the self-developed EV3 simulation. Therefore, this paper covers the holistic concept of integration. KW - LEGO MindStorms KW - ANSI C Y1 - 2019 SP - 96 EP - 101 PB - IEEE ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Klopp, Marco A1 - Abke, Jörg T1 - Pair Programming as a Didactical Approach in Higher Education and its Evaluation T2 - 2019 Global Engineering Education Conference (EDUCON) N2 - To handle heterogeneity within students, to foster needed generic competencies, to motivate them, and to increase their employability, Pair Programming seems to be a suitable didactical method to teach and learn programming. In this context, Pair Programming was used in programming lessons and its effectiveness was evaluated. This paper presents the results of the evaluations in order to derive whether Pair Programming is a suitable method to meet the mentioned challenges in a didactically meaningful way. KW - Softwareentwicklung KW - Teamwork Y1 - 2019 SP - 1090 EP - 1097 PB - IEEE ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - A Software Engineer's Competencies: Undergraduate Preconceptions in Contrast to Teach-ing Intentions T2 - Proceedings of the 52nd Hawaii International Conference on System Sciences 2019 N2 - Unlike numerous scientific disciplines, the field of engineering has rarely been subject to investigations of undergraduate pre-/misconceptions except for STEM subjects within engineering degrees. When it comes to Software Engineering, some special issues have to be taken into account (e.g. novelty of the discipline and immateriality of the product) that make this discipline hard to teach and learn. Additionally, it requires a wide range of different technical competencies as well as soft skills. As a consequence, the goal is to improve learning by using undergraduates’ “right” conceptions as “points of departure” and reduce learning obstacles by facing misconceptions. This paper is giving some first insights into a quantitative study conducted with undergraduates – before and after instruction – as well as two professors using a questionnaire to rate Software Engineering competencies to elicit preconceptions. KW - Software Engineering Y1 - 2019 SN - 978-0-9981331-2-6 SP - 7789 EP - 7797 ER - TY - JOUR A1 - Rötzel, Peter T1 - Managementinformationssysteme JF - Controlling N2 - Durch Globalisierung und Digitalisierung rücken Managementinformationssysteme immer stärker in den Fokus und gewinnen als Wettbewerbsvorteil stetig an Bedeutung. Allerdings führen das stetige Wachstum des internationalen Handels und die steigende globale Abhängigkeit von Produktionsprozessen zu einem hohen Anpassungsdruck auf die Managementinformationssysteme, die zumeist mit hohen Kosten verbunden sind. Die Anpassung oder Neuausrichtung des Managementinformationssystems kann allerdings auch große Chancen beinhalten: Unternehmen, welche starkes Augenmerk auf Managementinformationssysteme legen und deutlich mehr in diesen Bereich investieren als die Peergroup, erzielen starke Prozessverbesserungen in der Wertschöpfungskette und erreichen damit eine signifikante Ersparnis bei den Betriebskosten, die bei den Best-in-class Unternehmen bei einem Mehrfachen der investierten Mittel liegen kann. KW - Managementinformationssystem Y1 - 2015 U6 - https://doi.org/https://doi.org/10.15358/0935-0381-2015-8-9-512 VL - 27 IS - 8/9 SP - 512 EP - 514 ER - TY - JOUR A1 - Rötzel, Peter T1 - Informationslast im unternehmensinternen Berichtswesen JF - Controlling N2 - Informationslast ist in der heutigen „Information Society“ ein wesentlicher Faktor bei Entscheidungen im Unternehmensalltag. Neben den vielen Vorteilen der Weiterentwicklung von Managementinformationssystemen und der stetig höheren Verfügbarkeit von Informationen ist allerdings auch die Entwicklung zu betrachten, dass immer mehr Entscheidungsträger zu viele Informationen erhalten (vgl. Lohr, 2007). Quellen dieser Informationsüberlast sind das interne Berichtswesen und die schnelle und aufwandsarme Verfügbarkeit von Informationen über Managementinformationssysteme. Darüber hinaus ist die Herausforderung, auch für das Controlling, Entscheidungsträgern im Unternehmen einen optimalen Umfang an Informationen zur Verfügung zu stellen, keine reine IT-Problematik, sondern betrifft sehr stark auch die Bereiche Personalwesen und Organisation. Daher sollte das Controlling in seiner Koordinationsfunktion auch Personalwesen und Organisation berücksichtigen. KW - Managementinformationssystem KW - Bericht KW - Betriebliches Informationssystem Y1 - 2014 U6 - https://doi.org/https://doi.org/10.15358/0935-0381_2014_10_566 VL - 26 IS - 10 SP - 566 EP - 567 ER - TY - JOUR A1 - Lohmann, Christian A1 - Rötzel, Peter T1 - Opportunistic behaviour in renegotiations between public–private partnerships and government institutions: Data on public–private partnerships of the German armed forces JF - International Public Management Journal N2 - This study analyzes survey data on public-private partnerships (PPPs) of the German Armed Forces. The analyzed PPPs are unique in that the German Federal Ministry of Defence, a government institution, has a dual role as a main shareholder and a major customer. Drawing on these data, the present article analyzes how a government institution influences a PPP's set of objectives and shows that the conflict of interest with respect to monetary objectives between the government institution and the PPP as a whole is low in such partnerships. Furthermore, the article examines the opportunistic behavior of PPPs in contractual renegotiations where the government institution acts as a customer. The results show that, although such behavior indeed occurs, it does not concern monetary issues, since the government institution can control the monetary objectives of PPPs in which it is a main shareholder. Third, this study also analyzes and identifies certain exogenous factors that may influence the level of opportunistic behavior exhibited by the examined PPPs, providing evidence on the causes and effects of such behavior and indicating how it can be limited by the government institution. KW - Public Private Partnership Y1 - 2014 U6 - https://doi.org/DOI: 10.1080/10967494.2014.935245 VL - 17 IS - 3 SP - 1 EP - 24 ER - TY - CHAP A1 - Rötzel, Peter A1 - Lohmann, Christian T1 - The Influence of Perception of Fairness on Innovation Idea Value and Knowledge Sharing Behavior in Innovation Idea Networks T2 - Proceedings of the 22nd European Conference on Information Systems (ECIS) N2 - This article explores the relationships between innovation idea value, innovators’ perceptions of fairness, and their participation behavior and knowledge sharing behavior in the intrafirm social network. The study uses survey data and a database from a large company that is one of Europe’s top performers in idea management. In addition to the idea database, this study surveys participating employees about their perceptions of fairness and their participation behavior and knowledge sharing behavior. The results show that there is a clear relationship between innovation idea value, employees’ perceptions of fairness, and employees’ participation behavior and knowledge sharing behavior. Furthermore, there is clear evidence that tenure increases the value of innovation ideas. The findings suggest a number of implications for ideation management and for the design of social networks for innovation ideas. To increase the value of innovation ideas, social networks for innovation ideas can be used if the allocation of rewards for idea providers is positively associated with the fairness perceptions of network members. KW - Knowledge sharing behavior KW - social networks KW - fairness perception KW - innovation management KW - idea value KW - Innovationsmanagement Y1 - 2014 UR - https://pdfs.semanticscholar.org/c520/ba6bf191d5f1194160f8ce879245b71fdddb.pdf IS - 12 ER - TY - JOUR A1 - Rötzel, Peter T1 - Kognitive Verzerrungen bei der Wahrnehmung von Risiken JF - Controlling N2 - Die Analyse, Bewertung, Kommunikation und Steuerung von Risiken wird oftmals durch das Controlling unterstützt oder selbst durchgeführt. Der Umgang mit Risiken ist geprägt durch mögliche kognitive Verzerrungen und subjektive Bewertungen der beteiligten Personen.So zeigen empirische Studien aus der betriebswirtschaftlichen und psychologischen Forschung bei der Risikowahrnehmung einige Verhaltensmuster von Entscheidungsträgern auf, die sich durch Heuristiken (sog. „Daumenregeln“) erklären lassen.Der Einsatz dieser Heuristiken ist evolutionär bedingt und ermöglicht es Menschen, durch einen sparsamen Umgang mit begrenzten kognitiven Ressourcen in kurzer Zeit zu einer Bewertung zu kommen (vgl.Renn et al., 2007). Der Einsatz von Heuristiken führt allerdings häufig dazu, dass die von Entscheidungsträgern geschätzte Eintrittswahrscheinlichkeit von Risiken sehr stark von der objektiven statistischen Eintrittswahrscheinlichkeit abweicht (vgl. Hertwig/Wulff,2014). KW - Risikoverhalten Y1 - 2015 U6 - https://doi.org/https://doi.org/10.15358/0935-0381-2015-6-320 VL - 27 IS - 6 SP - 320 EP - 322 ER - TY - CHAP A1 - Rötzel, Peter T1 - The Influence of Information Load and Creativity on Escalation of Commitment T2 - Proceedings of the 23rd European Conference on Information Systems (ECIS) N2 - This experimental study analyzes how two key factors, information load and creativity, influence decision making in escalation situations in which decision makers reinvest further resources in a losing course of action even when information indicates that the IT project is performing poorly and should be discontinued. Whereas previous studies focus on the complexity of information, this study investigates how different quantities of information influence escalation of commitment and how information load interacts with a decision maker’s interpretation of negative feedback regarding earlier decisions. In situations in which escalation of commitment can occur, infor-mation load is relevant for decision making for two reasons. First, in escalation situations in which decision makers face negative feedback, information load exacerbates the tendency to escalate commitment. Second, when an escalation tendency is absent, information load can lead to a decision to continue a losing course of action, which can be mistaken for escalation of commitment. Furthermore, decision makers with a higher level of creativity tend to invest more than decision makers with a lower level of creativity. Surprisingly, creative decision makers do not change their behavior when facing negative consequences while less creative decision mak-ers show an escalation of commitment tendency. KW - Creativity KW - escalation of commitment KW - information load KW - Informationsverhalten KW - Eskalation Y1 - 2015 UR - https://aisel.aisnet.org/ecis2015_cr/149/ IS - 149 ER - TY - CHAP A1 - Pedell, Burkhard A1 - Rötzel, Peter A1 - Seethamraju, Ravi T1 - Information load, escalation of commitment and culture - an experimental study T2 - Proceedings of the 23rd Americas Conference on Information Systems (AMCIS) N2 - This study analyzes how information influences decision making in escalation of situations. In those situations decision makers follow a losing course of action and invest further resources even when accounting information indicates that the project is performing poorly and should be discontinued. We conducted two experiments with Chinese participants and used a replication of Staw's (1976) often cited case. Our study investigates how different levels of information load influence escalation of commitment of Chinese participants. Contrary to the prior findings in Germany, we find that Chinese decision makers do not escalate when facing different levels of information load. These results, in light of prior studies that find a comparatively strong escalation tendency of Chinese decision makers, are explained along with the limitations and further research. Abstract This study analyzes how information influences decision making in escalation of situations. In those situations decision makers follow a losing course of action and invest further resources even when accounting information indicates that the project is performing poorly and should be discontinued. We conducted two experiments with Chinese participants and used a replication of Staw's (1976) often cited case. Our study investigates how different levels of information load influence escalation of commitment of Chinese participants. Contrary to the prior findings in Germany, we find that Chinese decision makers do not escalate when facing different levels of information load. These results, in light of prior studies that find a comparatively strong escalation tendency of Chinese decision makers, are explained along with limitations and further research. KW - Information load KW - culture KW - escalation of commitment KW - experiment KW - Informationsverhalten KW - Eskalation KW - China Y1 - 2017 UR - https://aisel.aisnet.org/amcis2017/AccountingIS/Presentations/6/ IS - 6 ER - TY - JOUR A1 - Lohmann, Christian A1 - Rötzel, Peter T1 - The Outcome of Renegotiations between Institutionalized Public–Private Partnerships and Their Public Clients JF - International Journal of Public Administration N2 - This study analyzes the renegotiations that take place between institutionalized public–private partnerships (PPPs) and their public clients drawing on survey data on the PPPs of the German Federal Armed Forces. Generally, both the party that initiates such renegotiations and the time at which renegotiations are launched determine the outcome of the PPP’s renegotiated remuneration. This effect is moderated by the degree of contract specificity and by a decrease in demand. Specifically, when the public client initiates the renegotiation of an incomplete contractual agreement due to a decrease in demand, it can successfully reduce the remuneration of the PPP. KW - Public–private partnership (PPP) KW - remuneration KW - renegotiation KW - risk KW - Public Private Partnership Y1 - 2017 U6 - https://doi.org/https://doi.org/10.1080/01900692.2017.1298128 VL - 41 IS - 9 SP - 735 EP - 745 ER - TY - JOUR A1 - Fehrenbacher, Dennis A1 - Rötzel, Peter A1 - Pedell, Burkhard T1 - The Influence of Culture and Framing on Investment Decision-Making: The Case of Vietnam and Germany JF - Cross Cultural & Strategic Management N2 - Abstract Purpose Cultural studies in business and economics research are still limited to particular cultures. Knowledge on cultural differences may help international corporations to adapt management practices according to the markets they are operating in. The purpose of this paper is to study the issue of escalation of commitment and framing in a new cultural setting involving Germany and Vietnam. This setting is unique and particularly interesting, for Germany being the biggest European market and Vietnam being one of the fastest growing emerging markets in Asia. Design/methodology/approach The authors use a lab experiment with student participants from Germany and Vietnam. Findings In a 2×2 in between-experiment, the authors find strong support that Vietnamese participants have a stronger tendency to invest additional resources and evidence that negatively framed information leads to the higher escalation of commitment. Implications are discussed. Originality/value The unique empirical comparison is important because differences between other western and eastern countries do not necessarily generalize to the setting. KW - Framing KW - Escalation of commitment KW - Lab experiment KW - Investment decision-making KW - Investitionsentscheidung KW - Vietnam Y1 - 2018 U6 - https://doi.org/10.1108/CCSM-10-2017-0139 VL - 25 IS - 4 SP - 763 EP - 780 ER - TY - CHAP A1 - Rötzel, Peter A1 - Fehrenbacher, Dennis T1 - On the Role of Information Overload in Information Systems (IS) Success: Empirical Evidence from Decision Support Systems T2 - International Conference on Information Systems (ICIS), Proceedings N2 - It has been suggested that information overload decreases decision-making performance. This study empirically examines the mediating role of information (over-)load on the relationships between two system features (deep structure usage and system quality) and managerial performance using a mixed-method-approach (survey and interviews). It analyzes the relationships with respect to a state-of-the-art decision support system (DSS). Our results indicate that information overload adversely affects managerial performance and mediates the influence of system quality and deep structure usage on managerial performance. We find that system quality is positively related to information overload. Drawing on cognitive load theory, we hypothesize and confirm that deep structure usage reduces perceived information overload. Additional evidence from interviews further illustrate these results and show that information overload can be influenced in counter-intuitive ways by system aspects. Our results have important implications for the design of modern information system (IS) landscapes to support managerial performance. They draw attention to the importance of information overload as a mediating factor in the interrelationship among deep structure usage, system quality and managerial performance. KW - Informationsüberlastung Y1 - 2019 UR - aisel.aisnet.org/icis2019/general_topics/general_topics/21/ IS - 21 ER - TY - JOUR A1 - Hummel, Katrin A1 - Rötzel, Peter T1 - Mandating the Sustainability Disclosure in Annual Reports – Evidence from the United Kingdom JF - Schmalenbach Business Review May 2019 N2 - This study investigates the sustainability disclosure effects of the introduction of the Companies Act 2006 Regulations 2013 in the United Kingdom. The regulation mandates the disclosure of information on greenhouse gas emissions, gender distribution and human rights issues. We examine two research questions: first, whether firms increased disclosure on the mandated topics after the regulation became effective relative to a control group, and second, whether a potential increase in disclosure is moderated by firms’ reporting incentives, namely, firms’ capital market visibility, growth orientation, governance structure, prior voluntary sustainability disclosure levels and critical media coverage. Our sample consists of the FTSE-350 firms and a matched control group of US firms. We use textual analysis to assess the disclosure of the mandated sustainability topics in firms’ annual reports. Specifically, we examine two types of disclosure, namely, the disclosure of the mandated key performance indicators and the narrative disclosure. Our results reveal a significant increase for both types of disclosure relative to the control group. Overall, this treatment effect tends to be smaller for firms with higher reporting incentives, i. e., reporting incentives mitigate the regulatory effect. Taken together, our results suggest that both standards and reporting incentives shape firms’ sustainability disclosure level. KW - Nachhaltigkeit KW - Großbritannien Y1 - 2019 U6 - https://doi.org/10.1007/s41464-019-00069-8 VL - 71 IS - 2 SP - 205 EP - 247 ER - TY - JOUR A1 - Rötzel, Peter A1 - Stehle, Alexander A1 - Pedell, Burkhard A1 - Hummel, Katrin T1 - Integrating environmental management control systems to translate environmental strategy into managerial performance JF - Journal of Accounting & Organizational Change N2 - Abstract Purpose This study aims to investigate the role of environmental management control systems as mechanisms to translate environmental strategy into environmental managerial performance. Design/methodology/approach Based on survey data from 218 firms, the authors test a structural equation model. Findings The results show that environmental management control systems mediate the relationship between environmental strategy and environmental managerial performance. Moreover, the level of integration between regular and environmental management control systems significantly impacts the relationship between environmental management control systems and environmental managerial performance. Therefore, environmental management control systems are important mechanisms to translate environmental strategy into managerial performance, and a high level of integration can reinforce this role. Research limitations/implications The typical shortcomings of survey-based research apply to this study. Originality/value While previous research focuses primarily on environmental performance at the organizational level, this study addresses individual managerial performance with regard to environmental outcomes. In addition, the authors investigate how the level of integration between regular and environmental management control systems influences the relationship between environmental strategy and environmental managerial performance as well as the mediating role of environmental management control systems. KW - Managerial behavior KW - Environmental Accounting KW - Management control system KW - Survey data KW - Structural equation modeling KW - Umweltbezogenes Management Y1 - 2019 U6 - https://doi.org/https://doi.org/10.1108/JAOC-08-2018-0082 VL - 2015 IS - 4 SP - 626 EP - 653 ER - TY - CHAP A1 - Kreß, Viktor A1 - Jung, Janis A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Pose Based Start Intention Detection of Cyclists N2 - In this work, we present a new approach for start intention detection of cyclists based on 3D human pose estimation to increase their safety in road traffic. Start intention detection is realized using sequences of frame-wise estimated 3D poses. The poses were obtained by image sequences recorded by a stereo camera mounted behind the windshield of a moving vehicle. For training and evaluation, a dataset with 206 starting cyclists was created in real traffic. We demonstrate the advantages of this approach by comparing it to an existing, solely head trajectory based method. In particular, we investigate the performance for different observed time horizons ranging from 0.12 s up to 1.0 s as inputs for the two methods. This is of special importance for the protection of cyclists in road traffic, as they often only become visible to approaching vehicles shortly before dangerous situations occur. With an input length of 1.0 s the solely head trajectory based approach detects starting motions on average 0.834 s after the first motion of the bicycle with an F1-score of 97.5 %. The pose based approach outperforms these results by achieving the same F1-score 0.135 s earlier. The advantages of the pose based method become even more obvious with shorter input lengths. With an input length of 0.12 s, the head based approach achieves an F1-score of 93.5 % after 2.37 s, while the same score is reached after 0.668 s using poses. KW - Fahrerassistenzsystem KW - Fahrrad Y1 - 2019 U6 - https://doi.org/10.1109/ITSC.2019.8917215 SP - 2381 EP - 2386 PB - IEEE CY - Auckland ER - TY - CHAP A1 - Freytag, Andreas A1 - Krüger, Malte T1 - Currency Boards T2 - Enzyklopädisches Lexikon des Geld-, Bank- und Börsenwesens KW - Geldpolitik KW - Wechselkurspolitik Y1 - 1999 SP - 340 EP - 343 PB - Knapp CY - Frankfurt am Main ER - TY - CHAP A1 - Krüger, Malte T1 - New Monetary Economic T2 - Geld-, Bank- und Börsenlexikon KW - Geldtheorie Y1 - 2000 PB - Schäffer-Poeschel CY - Stuttgart ER - TY - RPRT A1 - Böhle, Knud A1 - Krüger, Malte A1 - Herrmann, C. A1 - Carat, Gérard A1 - Maghiros, Ioannis T1 - Electronic Payment Systems – Strategic and Technical Issues – Background Paper No. 1, Electronic Payment Systems Observatory (ePSO), Sevilla KW - Elektronischer Zahlungsverkehr Y1 - 2000 VL - Dezember 2000 ER - TY - RPRT A1 - Krüger, Malte T1 - M-Payments and the Role of Telcos T2 - ePSO-Newsletter, October 2000 KW - Elektronischer Zahlungsverkehr Y1 - 2000 SP - 4 EP - 7 ER - TY - RPRT A1 - Krüger, Malte T1 - Interchange Fees in the Line of Fire T2 - ePSO-Newsletter, January 2001 KW - Elektronischer Zahlungsverkehr Y1 - 2001 IS - 4 SP - 5 EP - 7 ER - TY - RPRT A1 - Krüger, Malte T1 - The Future of M-payments – Business Options and Policy Issues T2 - Background Paper No. 2, Electronic Payment Systems Observatory, Institute for Prospective Technological Studies, Sevilla KW - Elektronischer Zahlungsverkehr Y1 - 2001 ER - TY - RPRT A1 - Böhle, Knud A1 - Krüger, Malte T1 - Payments Culture Matters – A Comparative EU-US Perspective on Payment Cultures T2 - Background Paper No. 4, Electronic Payment Systems Observatory, Institute for Prospective Technological Studies, Sevilla KW - Elektronischer Zahlungsverkehr Y1 - 2001 ER - TY - RPRT A1 - Krüger, Malte T1 - Innovation and Regulation – The Case of E-money Regulation in the EU T2 - Background Paper No. 5, Electronic Payment Systems Observatory; Institute for Prospective Technological Studies, Sevilla KW - Elektronischer Zahlungsverkehr Y1 - 2001 VL - 2001 ER - TY - CHAP A1 - Krüger, Malte T1 - Convergence between banking and telecommunications sectors T2 - Future bottlenecks in the information society report to the European Parliament, Committee on Industry, External Trade, Research and Energy (ITRE), prepared by IPTS, ISIS, SPRU and TNO-STB KW - Kreditwesen KW - Telekommunikationsmarkt Y1 - 2001 VL - 2001 ER - TY - JOUR A1 - Krüger, Malte T1 - Offshore e-money issuers and monetary policy JF - First Monday KW - Elektronischer Zahlungsverkehr Y1 - 2005 N1 - Wiederabdruck mit neuer Einleitung VL - 2005 IS - 3 SP - 1 EP - 1 ER - TY - CHAP A1 - Watrin, Christian A1 - Krüger, Malte T1 - The shift from a net capital exporter to a net capital importer - the case of Germany T2 - Economic transformation in Eastern Europe and East Asia : a challenge for Japan and Germany KW - Kapitalmarkt KW - Auslandskapital Y1 - 1995 SP - 35 EP - 43 PB - Springer CY - Berlin ER - TY - CHAP A1 - Dluhosch, Barbara A1 - Krüger, Malte T1 - The Marshall Plan as a development push : a cautionary tale from Germany T2 - Vordenker einer neuen Wirtschaftspolitik : Wirtschaftsordnung, Marktwirtschaft und Ideengeschichte KW - Marshall-Plan Y1 - 2000 SP - 55 EP - 69 PB - FAZ-Buch CY - Frankfurt/Main ER - TY - CHAP A1 - Krüger, Malte T1 - Die Bedeutung mobiler Zahlungsformen T2 - Handbuch e-Payments KW - Elektronischer Zahlungsverkehr Y1 - 2001 SP - 363 EP - 373 PB - Deutscher Wirtschaftsdienst CY - Köln ER - TY - CHAP A1 - Krüger, Malte T1 - E-money regulation in the EU T2 - E-Money and Payment Systems Review KW - Elektronischer Zahlungsverkehr Y1 - 2002 SP - 239 EP - 251 PB - Centralbanking CY - London ER - TY - CHAP A1 - Hensel, Alexander A1 - Roth, Frederick A1 - Merz, Corinna A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - Investigation of Pressureless Sintered Interconnections on Plasma Based Additive Copper Metallization for 3-Dimentional Ceramic Substrates in High Temperature Applications T2 - 22nd Microelectronics and Packaging Conference (EMPC) & Exhibition, 16 Sep 2019 - 19 Sep 2019, Conference Center PISA, Italy KW - 3D, KW - Kupfer KW - Sintern KW - Silbersintern KW - Sintern KW - Hochtemperatur Y1 - 2019 ER - TY - CHAP A1 - Stenzel, David A1 - Schwarzer, Christian A1 - Schnepf, Michael A1 - Schmitt, Wolfgang A1 - Blank, Thomas A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - Characterization of Alternative Sinter Materials for Power Electronics T2 - 22nd Microelectronics and Packaging Conference (EMPC) & Exhibition, 16 Sep 2019 - 19 Sep 2019, Conference Center PISA, Italy KW - Sintern, Silber, Kupfer KW - Leistungselektronik KW - Sintern Y1 - 2019 ER - TY - CHAP A1 - Schmitt, Wolfgang A1 - Schnepf, Michael A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - Investigation of a Sintering Process for Micro-Scale Copper Material T2 - 2019 SMTA Electronic in Harsh Environments Conference KW - Kupfer KW - Sintern Y1 - 2019 VL - 2019 ER - TY - CHAP A1 - Schwarzer, Christian T1 - Zuverlässigkeit von Lötverbindungen in Abhängigkeit von ihrem Porenanteil T2 - 22. Europäisches Elektroniktechnologie-Kolleg 27.-31. März 2019 Colonia de Sant Jordi, Mallorca KW - Lötverbindung KW - Zuverlässigkeit Y1 - 2019 ER - TY - CHAP A1 - Hensel, Alexander A1 - Schwarzer, Christian A1 - Scheetz, Matthias A1 - Kaloudis, Michael A1 - Franke, Jörg T1 - Investigations of Silver Sintered Interconnections 3-Dimensional Ceramics with Plasma Based Additive Copper Metallizations T2 - 2018 IEEE 20th Electronics Packaging Technology Conference (EPTC) KW - Leistungselektronik KW - Hochtemperatur KW - Sintern Y1 - 2018 U6 - https://doi.org/10.1109/EPTC.2018.8654421 VL - 2018 SP - 416 EP - 421 CY - Singapore ER - TY - CHAP A1 - Schwarzer, Christian A1 - Chew, Ly May A1 - Schnepf, Michael A1 - Stoll, Thomas A1 - Franke, Jörg A1 - Kaloudis, Michael T1 - INVESTIGATION OF COPPER SINTER MATERIAL FOR DIE ATTACH T2 - SMTA International Conference Proceedings KW - Leistungshalbleiter KW - Leistungselektronik KW - Kupfer KW - Sintern Y1 - 2018 VL - 2018 IS - Proceedings SMTAI 2018 CY - Rosemont ER - TY - CHAP A1 - Kreß, Viktor A1 - Jung, Janis A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard ED - Draude, Claude ED - Lange, Martin ED - Sick, Bernhard T1 - Start Intention Detection of Cyclists using an LSTM Network T2 - INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft (Workshop-Beiträge) N2 - In this article, we present an approach for start intention detection of cyclists based on their head trajectories. Therefore, we are using a network architecture based on Long Short-Term Memory (LSTM) cells, which is able to handle input sequences of different lengths. This is important because, for example, due to occlusions, cyclists often only become visible to approaching vehicles shortly before dangerous situations occur. Hence, the dependency of the results on the input sequence length is investigated. We use a dataset with 206 situations where cyclists were transitioning from waiting to moving that was recorded from a moving vehicle in inner-city traffic.With an input sequence length of 1.0 s we achieve an F1-score of 96.2% on average 0.680 s after the first movement of the bicycle. We obtain similar results for sequence lengths down to 0.2 s. For shorter sequences, the results regarding the F1-score and the mean detection time deteriorate considerably. KW - Fahrerassistenzsystem KW - Fahrrad Y1 - 2019 SN - 978-3-88579-689-3 U6 - https://doi.org/10.18420/inf2019_ws25 SN - 1617-5468 SP - 219 EP - 228 PB - Gesellschaft für Informatik e.V. CY - Bonn ER - TY - JOUR A1 - Rötzel, Peter T1 - Information overload in the information age: a review of the literature from business administration, business psychology, and related disciplines with a bibliometric approach and framework development JF - Business Research N2 - In the light of the information age, information overload research in new areas (e.g., social media, virtual collaboration) rises rapidly in many fields of research in business administration with a variety of methods and subjects. This review article analyzes the development of information overload literature in business administration and related interdisciplinary fields and provides a comprehensive and overarching overview using a bibliometric literature analysis combined with a snowball sampling approach. For the last decade, this article reveals research directions and bridges of literature in a wide range of fields of business administration (e.g., accounting, finance, health management, human resources, innovation management, international management, information systems, marketing, manufacturing, or organizational science). This review article identifies the major papers of various research streams to capture the pulse of the information overload-related research and suggest new questions that could be addressed in the future and identifies concrete open gaps for further research. Furthermore, this article presents a new framework for structuring information overload issues which extends our understanding of influence factors and effects of information overload in the decision-making process. KW - Information processing KW - Information management strategies KW - Information overload KW - Literature review KW - Bibliometric literature analysis KW - Informationsüberlastung Y1 - 2019 U6 - https://doi.org/10.1007/s40685-018-0069-z VL - 12 IS - 2 SP - 479 EP - 522 ER - TY - THES A1 - Adelmann, Benedikt T1 - Lasermaterialbearbeitung von Halbleitern und Keramiken für Anwendungen der Leistungselektronik KW - Laserbearbeitung KW - Leistungselektronik Y1 - 2019 SN - 978-3-8440-7111-5 PB - Shaker ER - TY - THES A1 - Köhler, Tim T1 - Auswirkungen elektromagnetischer Strahlung auf die elektrophysiologischen Eigenschaften neuronaler und kardialer Zellnetzwerke KW - Neuronales Netz KW - Elektromagnetische Strahlung Y1 - 2019 UR - https://tuprints.ulb.tu-darmstadt.de/id/eprint/8544 ER - TY - CHAP A1 - Krüger, Malte T1 - Some Canadian Lessons for EMU T2 - Before and Beyond EMU: Historical lessons and future prospects KW - Geldpolitik Y1 - 2002 SP - 146 EP - 156 PB - Routledge CY - London ER - TY - CHAP A1 - Krüger, Malte A1 - Leibold, Kay T1 - Internet-Zahlungen aus der Sicht der Verbraucher T2 - Handbuch E-Money, E-Payment & M-Payment KW - Elektronischer Zahlungsverkehr Y1 - 2007 SP - 307 EP - 324 PB - Physica-Verlag CY - Heidelberg ER - TY - JOUR A1 - Alexander, Morgan A1 - Short, Robert A1 - Jones, Frank A1 - Stollenwerk, Manfred A1 - Mathar, Gerd A1 - Zabold, Jochen A1 - Michaeli, Walter T1 - An XPS investigation into the chemical structure of deposits formed from hexamethyldisiloxane/oxgen plasmas JF - Journal of Materials Science KW - Hexamethyldisiloxan KW - Plasma Y1 - 1996 VL - 31 SP - 1879 EP - 1885 ER - TY - CHAP A1 - Mahlzahn, Erik A1 - Heuken, Michael A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred A1 - Heime, Klaus T1 - High mobility and high sheet density p-type pseudomorphic MODFET T2 - Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK KW - HEMT Y1 - 1990 SP - 579 EP - 584 ER - TY - CHAP A1 - Glade, M. A1 - Hergeth, J. A1 - Stollenwerk, Manfred A1 - Grützmacher, Detlev A1 - Balk, Peter T1 - Effects of zinc diffusion during MOPVE on performance of InP/InGaAsP double heterostructure lasers T2 - Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK KW - Indiumphosphid KW - Indiumarsenid KW - Galliumarsenid Y1 - 1990 SP - 579 EP - 584 ER - TY - CHAP A1 - Mahlzahn, Erik A1 - Heuken, Michael A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred A1 - Heime, Klaus T1 - Advanced InGaAs/InP p-type sydomorphic MODFET T2 - Proceedings of the SPIE KW - Indiumarsenid KW - Galliumarsenid KW - Indiumphosphid Y1 - 1991 VL - 1362 SP - 199 EP - 204 ER - TY - JOUR A1 - Schwedler, Ralf A1 - Wolter, Karl A1 - Gallmann, B. A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred A1 - Kurz, H. T1 - Optical characterization of In-rich strained In1-xGaxAs/InP single- and multiple-quantum-wells JF - Materials Science and Engineering: B N2 - We report on the photoluminescence spectroscopy of a large set of strained In1−xGaxAs/InP quantum well structures grown by low pressure metallo-organic vapour phase epitaxy. Distinct peaks from monolayer steps are observed in all samples. For the first time, data on indium-rich In1−xGaxAs/InP structures with complementary gallium contents as low as xGa = 0.07 and xGa = 0.11 are reported. The sample quality appears independent of the number of quantum wells stacked in the structure. With decreasing gallium content, a decrease in luminescence intensity is observed, which is related to an increase in the number of non-radiative recombination centres with respect to lattice-matched samples. KW - Photolumineszenzspektroskopie KW - Indiumarsenid KW - Galliumarsenid KW - Indiumphosphid Y1 - 1991 VL - 9 IS - 1–3 SP - 297 EP - 300 ER - TY - JOUR A1 - Wolter, Karl A1 - Schwedler, Ralf A1 - Gallmann, B. A1 - Jaekel, Christian A1 - Stollenwerk, Manfred A1 - Camassel, Jean A1 - Laurenti, Jean Pierre T1 - Optical characterization of strained InGaAs/InP quantum well structures JF - Microelectronic Engineering N2 - The effects of strain on the optical properties ofmultiple-quantum well structures grown by low pressure metal organic vapor phase epitaxy have been investigated by photoluminescence spectroscopy. The investigated composition range is varied between 0.17 ≤ xGa ≤ 1.00. Sputtered neutrals mass spectroscopy has been used to calibrate the growth interpolated nominal compositions. Distinct peaks from monolayer variations of well thickness are observed from all samples. The analysis of the PL-spectra leads to the assumption of an intermediate layer of InAs0.65P0.35 at the InP to In1−ϰGaχAs(lower) interface. KW - Indiumarsenid KW - Galliumarsenid Y1 - 1991 VL - 15 IS - 1–4 SP - 593 EP - 596 ER - TY - JOUR A1 - Oschinowo, John A1 - Forchel, Alfred A1 - Dreybrodt, Jörg A1 - Emmerling, Monika A1 - Gyuro, Imre A1 - Speier, Peter A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred T1 - Lateral thermal stability modulation for the definition of InGaAs/InP wires JF - Microelectronic Engineering N2 - We have investigated a novel technique for the definition of semiconductor wires. By the selective local removal of the InP top barrier layer wire patterns in which the top material varies between InP and InGaAs are formed from an InGaAs/InP quantum well. In a subsequent annealing step the top InGaAs layer shows substantially stronger interdiffusion than the InP covered regions (wires). By using luminescence spectroscopy we show that this defectfree enhanced interdiffusion can be used to obtain a lateral energy barrier. KW - Indiumarsenid KW - Galliumarsenid Y1 - 1992 VL - 17 IS - 1–4 SP - 505 EP - 508 ER - TY - JOUR A1 - Meyer, R. A1 - Hardtdegen, Hilde A1 - Grützmacher, Detlev A1 - Carius, R. A1 - Stollenwerk, Manfred A1 - Balk, Peter T1 - Optical and structural properties of MOVPE grown GaxIn1-xAs/InP strained multiple quantum well structures JF - Journal of Electronic Materials N2 - This paper presents a study of the structural and optical properties of strained GaInAs/ InP multiple quantum well (MQW) structures fabricated by LP-MOVPE. The composition of the Ga x In1−x As films ranged fromx = 0.17 tox = 1.0 and was determined by sputtered neutral mass spectrometry (SNMS) on thick layers. The structures of the MQW samples with well widths from 1.5 to 5 nm were investigated by high resolution x-ray diffraction (HR-XRD). Simulations of the diffraction patterns showed that transition layers of approximately 2 monolayer (ML) thickness with high lattice mismatch exist at the interfaces. Photoluminescence (PL) measurements indicate well widths of a multiple of a monolayer with local variations of one monolayer. The PL peak energies vary smoothly with the Ga concentration. These results were confirmed by optical absorption measurements. KW - Galliumarsenid KW - Indiumarsenid KW - Indiumphosphid Y1 - 1992 VL - 21 IS - 3 SP - 293 EP - 298 ER - TY - JOUR A1 - Shi, Chang-Xin A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred A1 - Wang, Qing-Kang A1 - Heime, Klaus T1 - High-performance undoped InP/n-InP/GaAs MSM photodetectors grown by LP-MOVPE JF - IEEE Transactions on Electron Devices KW - Indiumarsenid KW - Galliumarsenid Y1 - 1992 VL - 39 IS - 5 SP - 1028 EP - 1031 PB - IEEE ER - TY - CHAP A1 - Oschinowo, John A1 - Forchel, Alfred A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred T1 - RTA study of thermal stability and interdiffusion of InGaAs/InP quantum wells - the influence of InGaAs cap layers T2 - Third International Conference Indium Phosphide and Related Materials Cardiff/Wales N2 - A study of the thermal stability of InGaAs/InP quantum wells with different top barrier compositions that used rapid thermal annealing at temperatures between 600 degrees C and 950 degrees C (annealing time 1 min) is discussed. The thermal interdiffusion effects were evaluated by photoluminescence spectroscopy. From the temperature dependence of the luminescence energy shifts the interdiffusion coefficients and activation energies are determined. KW - Photolumineszenzspektroskopie KW - Indiumarsenid KW - Galliumarsenid KW - Indiumphosphid Y1 - 1991 SP - 606 EP - 609 ER - TY - JOUR A1 - Oschinowo, John A1 - Forchel, Alfred A1 - Grützmacher, Detlev A1 - Stollenwerk, Manfred A1 - Heuken, Michael A1 - Heime, Klaus T1 - Photoluminescence study of interdiffusion in In0,53Ga0,47/As/InP surface quantum wells JF - Applied Physics Letters N2 - We have investigated the thermal stability and interdiffusion of In0.53Ga0.47As/InP surface quantum wells. In these structures the optically active InGaAs layer is bounded on one side by vacuum and on the other side by InP. We obtain well‐defined photoluminescence emission spectra with high intensity. After rapid thermal annealing at temperatures between 500 and 900 °C (annealing time 1 min) we observe strong emission energy shifts of up to 316 meV. By using a simple model of ion intermixing we estimate large interdiffusion coefficients (e.g., 1.7×10−14 cm2 s−1 for T=900 °C) and an activation energy of 1.3 eV for the surface quantum wells. KW - Photolumineszenz Y1 - 1992 VL - 60 IS - 21 SP - 2660 EP - 2662 ER - TY - CHAP A1 - Stollenwerk, Manfred A1 - Grützmacher, Detlev A1 - Schwedler, Ralf A1 - Meyer, R. A1 - Hardtdegen, Hilde A1 - Kux, A. A1 - Heime, Klaus T1 - Systematic study of strained GaInAs/InP grown by MOVPE KW - Galliumarsenid KW - Indiumarsenid Y1 - 1991 N1 - 4th European workshop on metallorganic vapour phase epitaxy, Nijmegen, NL, 1991 ER - TY - CHAP A1 - Stollenwerk, Manfred A1 - Grützmacher, Detlev A1 - Heime, Klaus A1 - Möhrle, Martin A1 - Fidorra, Frank T1 - GaInAs/GaInAsP SC-MQW Laser mit einer Emissionswellenlänge von 1,35 µm deponiert mit Hilfe der LP-MOVPE KW - Quantenwell-Laser KW - Galliumarsenid KW - Indiumarsenid Y1 - 1991 N1 - Beitrag zum Kolloquium “Photonische Komponenten“, Universität Ulm, April 1991 ER - TY - JOUR A1 - Stollenwerk, Manfred A1 - Grützmacher, Detlev T1 - GaInAs/GaInAsP SC-MQW-laser emitting at 1.35 µm grown by LP-MOVPE JF - Microelectronic Engineering KW - Quantenwell-Laser KW - Galliumarsenid KW - Indiumarsenid Y1 - 1991 VL - 1991 IS - 15 SP - 263 EP - 266 ER - TY - CHAP A1 - Stollenwerk, Manfred A1 - Michaeli, Walter A1 - Telgenbüscher, Klaus A1 - Leiber, Jörn A1 - Londschein, Martin T1 - Verbesserung von Verbundwerkstoffen durch Plasmabehandlung der Verstärkungsfasern KW - Faserverstärkter Kunststoff Y1 - 1992 N1 - 31. Internationale Chemiefasertagung Dornbirn, Österreich, September 1992 ER - TY - JOUR A1 - Michaeli, Walter A1 - Leiber, Jörn A1 - Telgenbüscher, Klaus A1 - Stollenwerk, Manfred T1 - Plasmapolymerisation: Kunststoffe beschichten JF - Industrieanzeiger KW - Plasmapolymerisation Y1 - 1992 VL - 1992 IS - 43 SP - 58 EP - 60 ER - TY - JOUR A1 - Mann, Michael A1 - Pribulla, Theodor A1 - Döhring, Thorsten A1 - Komzik, Richard A1 - Sivanic, Peter T1 - Power quality—Evaluation of safe operation of observatories JF - Astronomische Nachrichten N2 - The electric power supply of astronomical observatories has to manage a conflict of interest: Observatories are situated at remote locations, they have a high consumption of electric power while measuring electric signals as sensitively as possible. Within the project SLOBATCO, the question did arise, to what extent observatories have to rely on adequate power quality, for example, the perfectly sinusoidal shape of supply voltage and current, to ensure safe operation and accurate measurement results. International power quality standards are put in perspective with requirement specifications for observatories. This contribution describes themotivation, the underlying mechanisms that lead to issues, comments on the challenge in power systems engineering, proposes the instrumentation and installation, and interprets the first results. Experimental results clearly motivate the need for further measurement campaigns, as power-quality-related problems are common. A summary is provided together with an outlook and a motivation for future measurement campaigns. KW - power quality KW - observatory KW - standards KW - Sternwarte KW - Elektrizitätsversorgung KW - DEAL-Finanzierung Wiley Y1 - 2019 U6 - https://doi.org/10.1002/asna.201913672 VL - 2019 IS - 340 SP - 658 EP - 665 ER - TY - JOUR A1 - Michaeli, Walter A1 - Telgenbüscher, Klaus A1 - Leiber, Jörn A1 - Stollenwerk, Manfred T1 - Plasmapolymerisation zur Veredelung von Kunststoffoberflächen JF - Dünne Schichten KW - Plasmapolymerisation KW - Kunststoffprodukt KW - Oberflächenbehandlung Y1 - 1992 VL - 1992 IS - 3 SP - 34 EP - 38 ER - TY - JOUR A1 - Michaeli, Walter A1 - Stollenwerk, Manfred A1 - Telgenbüscher, Klaus A1 - Leiber, Jörn T1 - Vorbehandeln und Beschichten von Kunststoffteilen in PE-CVD-Anlagen JF - Maschinenmarkt KW - Kunststoffprodukt KW - Oberflächenbehandlung Y1 - 1993 VL - 99 IS - 29 SP - 42 EP - 48 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - Oberflächenmodifikation mittels Plasmatechnik KW - Plasmatechnik KW - Oberflächenbehandlung Y1 - 1993 N1 - VDI-Werkstoff-Forum auf der Hannovermesse, April 1993 ER - TY - CHAP A1 - Michaeli, Walter A1 - Leiber, Jörn A1 - Telgenbüscher, Klaus A1 - Stollenwerk, Manfred T1 - Plasma polymerization in automotive industries - A possibility for the reduction of permeation in plastic fuel tanks T2 - 26th intern. Symposium on Automotive Technology and Automation, Aachen Tagungsband KW - Plasmapolymerisation KW - Kraftfahrzeugindustrie Y1 - 1993 SP - 469 EP - 476 ER - TY - GEN A1 - Zell, Harald A1 - Telgenbüscher, Klaus A1 - Stollenwerk, Manfred T1 - Kratzfeste Beschichtungen von Kunststoffen mittels Plasmapolymerisation KW - Plasmapolymerisation Y1 - 1993 N1 - Seminar “Hartstoffbeschichtungen“, Haus der Technik, Essen, 28./29. September 1993 ER - TY - JOUR A1 - Michaeli, Walter A1 - Stollenwerk, Manfred A1 - Telgenbüscher, Klaus T1 - Plasmabehandlung - Ein umweltfreundliches Verfahren zur Oberflächenvorbehandlung und -reinigung JF - Scope-Journal Special KW - Plasmatechnik KW - Oberflächenbehandlung Y1 - 1993 VL - 1993 IS - 16 SP - 21 EP - 23 ER - TY - JOUR A1 - Leiber, Jörn A1 - Michaeli, Walter A1 - Telgenbüscher, Klaus A1 - Stollenwerk, Manfred T1 - UV protecting layers on PVC made by plasma polymerization JF - Journal of Vinyl Technology KW - Plasmapolymerisation Y1 - 1993 VL - 15 IS - 2 SP - 57 EP - 61 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - Das Abscheiden von kratzfesten, hydrophilen und hydrophoben Schichten mittels Plasmapolymerisation KW - Plasmapolymerisation Y1 - 1993 N1 - Beitrag zum Seminar “Plasmapolymerisation“ der Firma CP-Tec, München, November 1993 ER - TY - JOUR A1 - Michaeli, Walter A1 - Telgenbüscher, Klaus A1 - Stollenwerk, Manfred A1 - Mathar, Gerd A1 - Zell, Harald T1 - Plasmapolymerisierte Schichten: Neue Vielfalt der Funktionen JF - Schweizer Maschinenbau KW - Plasmapolymerisation Y1 - 1994 VL - 1994 IS - 41 SP - 90 EP - 93 ER - TY - GEN A1 - Stollenwerk, Manfred A1 - Zell, Harald T1 - Veredeln von Kunststoffoberflächen mittels Mikrowellenplasmapolymerisation KW - Plasmapolymerisation KW - Mikrowellentechnik Y1 - 1994 N1 - Seminar zur FAKUMA der Firma Schall Kongress GmbH, Friedrichshafen, Oktober 1994 ER - TY - CHAP A1 - Michaeli, Walter A1 - Stollenwerk, Manfred A1 - Steinkamp, F. A1 - Zell, Harald T1 - Plasmabehandlung von Glasfasern für faserverstärkte Kunststoffe T2 - 6. Bundesdeutsche Fachtagung Plasmatechnologie, Wuppertal KW - Faserverstärkter Kunststoff KW - Glasfaserverstärkter Kunststoff Y1 - 1994 ER - TY - GEN A1 - Michaeli, Walter A1 - Stollenwerk, Manfred A1 - Zell, Harald T1 - Variation der Oberflächenspannung bei flächigen Substraten und Verstärkungsfasern sowie der Einfluß auf die Faser/Matrix-Haftung bei faserverstärkten Kunststoffen KW - Faserverstärkter Kunststoff Y1 - 1994 N1 - Beitrag zum Seminar “Ausgewählte Anwendungen der Plasmapolymerisation“ der Plasmatechnologieinitiative NRW, Aachen, Oktober 1994 ER - TY - BOOK A1 - Wolters, Leo A1 - Stollenwerk, Manfred A1 - Berthold, J. T1 - Die Plasmatechnologie und ihre Einsatzmöglichkeiten KW - Plasmatechnik Y1 - 1994 N1 - Lehrbuch des Technologie-Transfer-Rings Handwerk Nordrhein-Westfalen CY - Aachen ER - TY - JOUR A1 - Alexander, Morgan A1 - Short, Robert A1 - Jones, Frank A1 - Stollenwerk, Manfred A1 - Mathar, Gerd A1 - Zabold, Jochen A1 - Michaeli, Walter T1 - The heterogeneous nature of deposits from hexamethyldisiloxane/oxygen plasmas JF - Ceramic films and coatings KW - Hexamethyldisiloxan KW - Sauerstoff KW - Plasma Y1 - 1995 VL - 1995 IS - 54 SP - 87 EP - 99 ER - TY - JOUR A1 - Stollenwerk, Manfred A1 - Alexander, Morgan A1 - Short, Robert A1 - Jones, Frank A1 - Zabold, Jochen A1 - Michaeli, Walter T1 - An X-ray photoelectron spectroscopic investigation into the chemical structure of deposits formed from hexamethyldisiloxane/ oxygen plasmas JF - Journal of Materials Science N2 - The effect of oxygen addition to microwave-sustained plasmas of hexamethyldisiloxane (HMDSO) has been investigated. Attention was directed to the solid products formed on aluminium substrates (plasma deposits). To enable a quantitative analysis of these, X-ray photoelectron spectroscopy (XPS) of standard silicon-containing materials was carried out. When suitable charge correction is applied to the XP spectra of HMDSO/O2 plasma deposits, a number of very clear trends emerge. From changes in elemental composition, core line binding energies (Si2p, C 1s, and O 1s) and widths, we show how oxygen addition to the plasma affects the chemical nature of the plasma deposit. The data reported also provide (some limited) information on the reactions taking place in the plasma. KW - Photoelektronenspektroskopie Y1 - 1996 VL - 31 IS - 7 SP - 1879 EP - 1885 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - CD-Recordable CD-Rewriteable T2 - Vortrag auf der REPLItech Summit (Conference) São Paulo, Brazil N2 - Vortrag KW - CD-R Y1 - 1998 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - Correlation of DVD-Recordable Disc Performance and Process Parameters T2 - Vortrag auf der „Replication EXPO 2003“, Shanghai, China N2 - Vortrag KW - DVD-R Y1 - 2003 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - Basics of Recordable Media Production T2 - Vortrag auf dem “International Recordable Media Technology Seminar”, Dubai N2 - Vortrag KW - CD-R KW - DVD-R Y1 - 2003 ER - TY - GEN A1 - Stollenwerk, Manfred T1 - Die optische Datenspeicherung auf CD und DVD T2 - Übersichtsvortrag auf der Fachtagung „Die Kunststoffoberfläche“ des Süddeutschen Kunststoffzentrums Würzburg N2 - Vortrag KW - Optischer Speicher Y1 - 2005 ER - TY - CHAP A1 - Stollenwerk, Manfred T1 - Efficient DVD/R Production T2 - Optical Disc Seminar Asia ODSA, Teipei KW - DVD-R KW - Produktion Y1 - 2005 ER - TY - JOUR A1 - Stollenwerk, Manfred A1 - Gattinger, P. T1 - Process challenges of high Speed DVD/R manufacturing JF - One to One magazine KW - DVD-R KW - Herstellung Y1 - 2005 VL - 2005 IS - March SP - 55 EP - 58 ER - TY - CHAP A1 - Stollenwerk, Manfred T1 - The Energy Market within the next 20 years T2 - 6 MEAI, Wien KW - Energiemarkt Y1 - 2006 ER - TY - CHAP A1 - Witte, Gerd A1 - Stollenwerk, Manfred T1 - Energy saving of cooling water pumps for power plants using adjustable propeller blades T2 - International Rotating Equipment Conference 2008, Düsseldorf KW - Kühlwasseranlage KW - Energieeinsparung Y1 - 2008 ER - TY - CHAP A1 - Krüger, Malte T1 - Geldnachfragedefekte und die Second Economy T2 - Systeme monetärer Steuerung : Analyse und Vergleich geldpolitischer Strategien, Schriften zu Ordnungsfragen der Wirtschaft KW - Geldpolitik KW - Bargeld Y1 - 2007 SP - 117 EP - 138 PB - De Gruyter CY - Berlin ER - TY - CHAP A1 - Krüger, Malte A1 - Leibold, Kay T1 - Internet Payments in Germany T2 - Handbook on Information Technology in Finance KW - Elektronischer Zahlungsverkehr Y1 - 2008 SP - 239 EP - 256 PB - Springer ER - TY - CHAP A1 - van Baal, Sebastian A1 - Krüger, Malte A1 - Hinrichs, Jens-Werner T1 - Bedeutung, Rahmenbedingungen und Instrumente des Risikomanagements im E-Commerce T2 - Risikomanagement im E-Commerce KW - Electronic Commerce KW - Risikomanagement Y1 - 2008 SP - 15 EP - 50 PB - Duncker & Humblot CY - Berlin ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Döhring, Thorsten A1 - Schäfer, Tobias A1 - Stollenwerk, Manfred A1 - Friedrich, Peter A1 - Burwitz, Vadim A1 - Hartner, Gisela A1 - Bradshaw, Miranda A1 - Liao, Yingyu A1 - Pelliciari, Carlo T1 - X-ray reflectivity measurements at chromium-iridium tri-layer coatings T2 - Proceedings of SPIE N2 - Studying astronomical objects in the X-ray regime, iridium-based layer systems are highly effective reflective materials for telescopes mirrors. Aschaffenburg University and the Czech Technical University in Prague jointly developed stress compensated chromium-iridium coatings. To overcome the disturbing reflectivity reduction of the iridium absorption edge around 2 keV photon energy and improve general reflectivity at lower incident energies, thin overcoat layers of chromium have been applied in addition. Corresponding measurements at several X-ray lines have been performed on these samples at the PANTER test facility of the Max-Planck Institute for extraterrestrial Physics. A part of the experimental results and their comparison with theoretical simulations are presented in this contribution. KW - iridium KW - mirror KW - coating KW - reflectivity KW - X-ray KW - Röntgenastronomie KW - Röntgenteleskop Y1 - 2019 U6 - https://doi.org/http://dx.doi.org/10.1117/12.2530439 VL - 2019 IS - 11119 SP - 111191L-1 EP - 111191L-6 ER - TY - PAT A1 - Speit, Burkard A1 - Wolff, Silke A1 - Döhring, Thorsten T1 - LEAD-CONTAINING RADIATION-RESISTANT GLASS AND PRODUCTION THEREOF N2 - PROBLEM TO BE SOLVED: To provide an optical glass which is used for design of space-saving and light imaging optical elements provided with various glass-type lenses and used in flights of various objects in space and has an increased refractive index. SOLUTION: A glass for space comprises 5-65 wt.% of SiO, 0-40 wt.% of BO, 0-12 wt.% of AlO, 5-50 wt.% of PbO, 0-8 wt.% of NaO and 0-20 wt.% of KO and contains at least three doping agents selected from CeO, MoO, BiO, WO, AgO, SnO, SbOand AsOin a total content of the doping agents of at least 0.1 wt.% in the glass for space. The glass for space preferably contains 0.5-1 wt.% of TiO additionally. KW - glass KW - radiation resistant KW - Optisches Glas KW - Raumfahrt Y1 - 2019 UR - https://worldwide.espacenet.com/publicationDetails/biblio?CC=JP&NR=6505508B2&KC=B2&FT=D&ND=6&date=20190424&DB=EPODOC&locale=en_EP# ER - TY - CHAP A1 - Hudec, Rene A1 - Pina, Ladislav A1 - Inneman, Adolf A1 - Semencova, Veronika A1 - Döhring, Thorsten T1 - X/EUV and UV optics for miniature cubesats payloads T2 - DGaO-Proceedings N2 - The recent progress in cubesat technologies allows scientific payloads for these minisatellites to be considered. We will discuss the possible miniature X/EUV and UV telescopes and monitors as potential minisats payloads. The advanced electronics image detectors allows the size of the optics to be miniaturized, still providing valuable scientific results. KW - satellite KW - payload KW - X-ray KW - optics KW - Kleinsatellit Y1 - 2019 UR - https://www.dgao-proceedings.de/download/120/120_p21.pdf SN - 1614-8436 VL - 2019 SP - 1 EP - 1 PB - DGaO ER - TY - CHAP A1 - Ruppert, Erich A1 - Reuter, Carsten A1 - Schumacher, Meike ED - Hofmann, Georg Rainer T1 - Offline in die Digitale Transformation? Wie sollte der Wissenstransfer zur Bewältigung von Herausforderungen im Zuge der Digitalen Transformation gestaltet werden? T2 - Wissenstransfer in der Wirtschaftsinformatik - Fachgespräch im Rahmen der MKWI 2018 N2 - Die Digitale Transformation, u.a. getrieben durch die weithin sichtbare Vision der Industrie 4.0, gilt als eine der großen Herausforderungen unserer Zeit. Insbesondere für den Wirtschaftsstandort Deutschland ergibt sich die Frage, wie KMU auf diese Transformation nicht nur vorbereitet, sondern auch bei deren Bewältigung durch Wissenstransfer aus Hochschulen heraus unter-stützt werden können. Die Vorteile, die dabei ein digitaler Wissenstransfer - Stichwort z.B. „e-Learning“ - bieten können, passen augenscheinlich gut zu den Charakteristika und Bedürfnissen von KMU. Es entstehen jedoch auch spezifische Herausforderungen. Diese liegen sowohl darin, in einer dynamischen Umgebung Themen zu identifizieren, die für die Unternehmen wichtig und interessant sind als auch in vielfältigen Akzeptanzproblematiken auf der Inhaltsebene und auch bezogen auf die Methoden des Wissenstransfers. Die hier vorgestellten Erkenntnisse, basierend auf einer Umfrage und Expertengesprächen im Rahmen des - durch den ESF und den Freistaat Bayern geförderten - mainproject2018. Sie zeigen, dass Wissenstransfer zum digitalen Wandel wohl auch aber nicht alleine durch digitale Methoden gestaltet werden kann. Denn bevor dieser von den eigentlichen Adressaten akzeptiert und genutzt wird, müssen fundamentale Vorbehalte und Widerstände abgebaut werden. Es werden daher neben den Ergebnissen der empirischen Untersuchung auch erste Überlegungen zu akzeptanzfördernden Maßnahmen im o.g. Kontext vorgestellt und diskutiert. KW - Wissenstransfer KW - Digitale Transformation KW - Europäischer Sozialfonds KW - ESF KW - Wissenschaftstransfer Y1 - 2018 SN - 978-3-9818442-0-7 SP - 26 EP - 36 CY - Aschaffenburg ER - TY - CHAP A1 - Pfenning, Stefan A1 - Döhring, Thorsten A1 - Möckel, Michael T1 - Einzelphotonenquellen – Schlüsselkomponenten für die Quantenwelt T2 - DGaO-Proceedings N2 - Deutschland investiert stark in Quantentechnologien und möchte seine aktuelle Vorreiterrolle in diesem Markt behaupten. Einzelphotonenquellen werden als Schlüsselkomponenten vieler Quantentechnologien dabei zukünftig große Bedeutung erlangen. Dieser Beitrag gibt als Markt- und Technologiestudie einen Überblick über diese junge Hochtechnologiebranche. KW - Einzelphotonenquellen KW - Quantentechnologie KW - Hochtechnologie KW - Einzelphotonenemission KW - Quantenphysik Y1 - 2019 UR - https://www.dgao-proceedings.de/download/120/120_p43.pdf SN - 1614-8436 VL - 2019 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Gösling, Lukas A1 - Pribulla, Theodor A1 - Komzik, Richard T1 - Segmentierte Infrarotfilter für das Ø1.3m Teleskop im slowakischen Tatra-Gebirge T2 - DGaO-Proceedings N2 - Im bayerisch-slowakischen Kooperationsprojekt SLOBATCO werden neuartige astronomische Filter entwickelt, welche auf die atmosphärischen Transmissionsfenster im NIR Spektralbereich ausgelegt sind. Um ein aufwendiges Filterrad für die bei tiefen Temperaturen betriebene CCD-Kamera zu vermeiden, werden die Beobachtungen über eine segmentierte Filterkombination realisiert. KW - Filter KW - Teleskop KW - Astronomie KW - Infrarot KW - Infrarot-Spektrum KW - Filter KW - Spiegelteleskop Y1 - 2019 UR - https://www.dgao-proceedings.de/download/120/120_p35.pdf SN - 1614-8436 VL - 2019 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Schneider-Störmann, Ludger A1 - Röhr, Thomas A1 - Jaskari, Rauni A1 - Holopainen, Timo A1 - Reunanen, Tero ED - Kantola, Jussi Ilari ED - Nazir, Salman T1 - Enhanced Higher Education - Industry Cooperation Improving Work Capabilities of Sales Engineering Graduates T2 - Advances in Human Factors, Business Management and Leadership Proceedings of the AHFE 2019 International Conference on Human Factors, Business Management and Society, and the AHFE International Conference on Human Factors in Management and Leadership, July 24-28, 2019, Washington D.C., USA N2 - Sales engineers (SE) sell technical products and services to companies, and their results are crucial for their employers. They need technical knowledge and commercial competencies, but also management and soft skills, all fundamental for SE to be highly performant in their job. Students cannot learn this variety neither at university nor in industry alone. Instead, cooperation is required. Whereas academic-industrial cooperation for research or specific study programs is discussed in literature, this is not yet the case for enhanced industrial involvement in students’ education. The authors present two case studies of industrial implication in students’ education in Germany and France as benchmark and basis for a new approach of academic-industrial cooperation in education in Finland. This cooperation is developed in the frame of the project ‘RADICAL - Filling Skills Gaps in Blue Industry by Radical Competence Boost in Engineering VET’, co-funded by the Erasmus+ program of the European Union. KW - Vertriebsingenieur KW - Finnland Y1 - 2019 UR - https://doi.org/10.1007/978-3-030-20154-8_1 VL - 2020 IS - 961 SP - 3 EP - 13 ER - TY - CHAP A1 - Schneider-Störmann, Ludger A1 - Jaskari, Rauni A1 - Holopainen, Timo A1 - Reunanen, Tero A1 - Röhr, Thomas ED - Kantola, Jussi Ilari ED - Nazir, Salman T1 - ENGINE Model – Changing Higher Education with Industry Cooperation T2 - Advances in Human Factors, Business Management and Leadership : Proceedings of the AHFE 2019 International Conference on Human Factors, Business Management and Society, and the AHFE International Conference on Human Factors in Management and Leadership, July 24-28, 2019, Washington D.C., USA N2 - The rapidly growing maritime industry of Southwestern Finland is suffering from lack of engineers. Industrial Management Engineers including Sales Engineers have technical knowledge and commercial competencies as well as management and soft skills, which are all fundamental for the maritime sector. However, it takes rather long time before a graduated engineer will be a productive worker for the company. A solution to getting the students faster operational into the companies is to deepen cooperation between higher education and industry during the studies and increase workplace based learning following the examples available in e.g. Germany and France. The authors present a new approach of academicindustrial cooperation in education in Finland which is developed in the frame of the project ‘RADICAL - Filling Skills Gaps in Blue Industry by Radical Competence Boost in Engineering VET (VET: Vocational Education and Training)’, co-funded by the Erasmus + program of the European Union. KW - Vertriebsingenieur KW - Finnland Y1 - 2019 UR - https://doi.org/10.1007/978-3-030-20154-8_16 VL - 2020 IS - 961 SP - 1 EP - 12 ER - TY - JOUR A1 - Mustorph, Heinz A1 - Stollenwerk, Manfred A1 - Bressau, Volker T1 - Current Developments in Optical Data Storage with Organic Dyes JF - Angewandte Chemie N2 - The main motivation for the development of digital data storage has been the improvement in play‐back quality and the increase in storage capacity. In 1982 Philips and Sony introduced the first technically and economically successful system based on this—the compact disc (CD) and a compatible player. A very broad diversity of optical data recording formats are available today, and a difference is drawn between prerecorded, recordable, and rewritable media. This Review gives an overview of the systems used, the main features of production, and then concentrates on the properties of the organic dyes that are used in recordable systems. Dyestuffs chemistry has gained the reputation of having become a mature field of activity. Is this prejudice or a justified swan song for dyestuffs chemistry? When applications in optical data storage are considered, it is evident that even today progresses such as CD‐R and DVD/R would not be feasible without functional dyes. KW - Optischer Speicher Y1 - 2006 VL - 45 IS - 13 SP - 2016 EP - 2035 ER - TY - CHAP A1 - Stollenwerk, Manfred T1 - DVD/R 16x high quality mass production - Vortrag auf der Conference Replication Expo, September 2005, Shanghai, China N2 - Vortrag auf der Conference Replication Expo September 2005, Shanghai, China KW - DVD-R Y1 - 2005 ER - TY - CHAP A1 - Krüger, Malte A1 - Seitz, Franz T1 - The importance of cash and cashless payments in Germany – Overview and first estimates T2 - The usage, costs and benefits of cash – revisited KW - Bargeldloser Zahlungsverkehr Y1 - 2014 ER - TY - CHAP A1 - Krüger, Malte T1 - Mobile payments: the second wave T2 - Transforming payment systems in Europe KW - Elektronischer Zahlungsverkehr Y1 - 2016 SP - 214 EP - 235 ER - TY - CHAP A1 - Krüger, Malte T1 - Pros and cons of cash: the state of the debate T2 - Cash on Trial, SUERF Conference Proceedings 2016/1 KW - Bargeld Y1 - 2016 SN - 978-3-902109-79-8 SP - 45 EP - 67 ER - TY - CHAP A1 - Krüger, Malte A1 - Seitz, Franz T1 - The Blessing of Cash T2 - The Blessing of Cash, International Cash Conference 2017 – War on Cash: Is there a Future for Cash? 25 - 27 April 2017, Island of Mainau, Germany KW - Bargeldloser Zahlungsverkehr Y1 - 2017 SP - 742 EP - 789 ER - TY - CHAP A1 - Schmiedeskamp, Bernt A1 - Döhring, Thorsten A1 - Heidemann, Bernhard A1 - Kleineberg, Ulf A1 - Kloidt, Andreas A1 - Müller, H. A1 - Nolting, Kerstin A1 - Heinzmann, Ulrich T1 - „Multischichten für optische Komponenten im weichen Röntgengebiet T2 - Dünnschichttechnologien `90 Y1 - 1990 PB - VDI Verlag CY - Düsseldorf ER - TY - JOUR A1 - Böwering, Norbert A1 - Döhring, Thorsten A1 - Gärner, Ulrich A1 - Heinzmann, Ulrich T1 - Spectral diagnosis of a laser-produced XUV source using a digital camera system with pinhole transmission grating JF - Laser and Particle Beams KW - Extremes Ultraviolett Y1 - 1991 VL - 9 IS - 2 SP - 593 EP - 601 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Schönhense, Gerd A1 - Heinzmann, Ulrich T1 - A circular polariser for the region of windowless VUV radiation JF - Measurement Science and Technology KW - Vakuumultraviolett KW - Strahlung Y1 - 1992 VL - 3 IS - 1 SP - 91 EP - 97 ER - TY - CHAP A1 - Schmiedeskamp, Bernt A1 - Döhring, Thorsten A1 - Heidemann, Bernhard A1 - Kleineberg, Ulf A1 - Kloidt, Andreas A1 - Nolting, Kerstin A1 - Pröpper, Michael A1 - Stock, Hans-Jürgen A1 - Tappe, Thorsten A1 - Heinzmann, Ulrich T1 - Verbundprojekt: Multischichten für optische Komponenten im weichen Röntgengebiet T2 - Dünnschichttechnologien `92 KW - Dünnschichttechnik Y1 - 1992 SP - 329 EP - 336 PB - VDI Verlag CY - Düsseldorf ER - TY - JOUR A1 - Döhring, Thorsten A1 - Schönhense, Gerd A1 - Heinzmann, Ulrich T1 - A circular polariser for the region of windowless VUV radiation JF - Engineering Optics KW - Vakuumultraviolett KW - Strahlung Y1 - 1992 VL - 1992 IS - May SP - 189 EP - 195 ER - TY - CHAP A1 - Kloidt, Andreas A1 - Stock, Hans-Jürgen A1 - Kleineberg, Ulf A1 - Döhring, Thorsten A1 - Pröpper, Michael A1 - Nolting, Kerstin A1 - Heidemann, Bernhard A1 - Tappe, Thorsten A1 - Schmiedeskamp, Bernt A1 - Heinzmann, Ulrich A1 - Krumrey, Michael K. A1 - Müller, Peter A1 - Scholze, Frank A1 - Rahn, Steffen A1 - Heidemann, Klaus F. T1 - Fabrication, thermal stability, and reflectivity measurements of Mo/Si multilayers as x-ray mirrors and other optical elements T2 - Proceedings of SPIE KW - Röntgenspiegel Y1 - 1992 VL - 1742 SP - 593 EP - 603 ER - TY - JOUR A1 - Kloidt, Andreas A1 - Stock, Hans-Jürgen A1 - Kleineberg, Ulf A1 - Döhring, Thorsten A1 - Pröpper, Michael A1 - Schmiedeskamp, Bernt A1 - Heinzmann, Ulrich T1 - Smoothing of interfaces in ultrathin Mo-Si multilayers by ion bombardment JF - Thin Solid Films KW - Dünne Schicht KW - Oberflächenphysik Y1 - 1993 VL - 228 IS - 1-2 SP - 154 EP - 157 ER - TY - CHAP A1 - Sauer, Theresia A1 - Kefer, Stefan A1 - Ruppert, Wolfgang A1 - Hellmann, Ralf A1 - Kaloudis, Michael T1 - Integration of Bragg grating sensors in components made of carbon fiber reinforced polymers T2 - Tagungsband der 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019, 25.06.2019 - 26.06.2019, Nürnberg, Deutschland N2 - This contribution discusses the integration of polymer planar Bragg grating sensors (PPBG) into carbon fiber reinforced polymer (CFRP) components. For the first time, it is shown that PPBGs based on cyclic olefin copolymers can be integrated into commercial-grade composites, thereby withstanding the demanding production processes. Pre-impregnated fibers are stacked and partially modified to form a sensor pocket. Afterwards, the CFRP specimen containing the optical sensor is cured in a heated mechanical press for 2 hours at a pressure of 7 bar and a temperature of 120 °C. A subsequent evalutaion of the sensor signal shows a Bragg wavelength shift of 1236 pm and a decline in signal amplitude of -2 dB. Three-point flexural tests of the cured sample reveal a linear behavior of the sensor signal towards external loads. The determined sensitivity in dependence of the CFRP specimen's maximum central deflection is -112 pm/mm, while correlation to the applied force results in a sensitivity of -5 pm/N. KW - Bragg grating sensors KW - carbon fiber reinforced polymers KW - cyclic olefin copolymers KW - structural health monitoring KW - Bragg-Reflektor Y1 - 2019 SN - 978-3-9819376-0-2 U6 - https://doi.org/10.5162/sensoren2019/P3.12 SP - 806 EP - 810 ER - TY - CHAP A1 - Kloidt, Andreas A1 - Stock, Hans-Jürgen A1 - Kleineberg, Ulf A1 - Döhring, Thorsten A1 - Pröpper, Michael A1 - Hilgers, Kerstin A1 - Heidemann, Bernhard A1 - Tappe, Thorsten A1 - Schmiedeskamp, Bernt A1 - Heinzmann, Ulrich T1 - Preparation and microstructure analysis of Mo/Si multilayers as x-ray optical elements T2 - Proceedings of Symposium on Surface Science 1993 KW - Röntgenspiegel Y1 - 1993 VL - 1993 SP - 115 EP - 120 ER - TY - JOUR A1 - Schmiedeskamp, Bernt A1 - Kloidt, Andreas A1 - Stock, Hans-Jürgen A1 - Kleineberg, Ulf A1 - Döhring, Thorsten A1 - Pröpper, Michael A1 - Rahn, Steffen A1 - Hilgers, Kerstin A1 - Heidemann, Bernhard A1 - Tappe, Thorsten A1 - Heinzmann, Ulrich A1 - Krumrey, Michael K. A1 - Müller, Peter A1 - Scholze, Frank A1 - Heidemann, Klaus F. T1 - Electronbeam-deposited Mo/Si and MoxSiySi multilayer X-ray mirrors and gratings JF - Optical Engineering KW - Röntgenspiegel Y1 - 1994 VL - 33 IS - 4 SP - 1314 EP - 1321 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Payer, Hans D. A1 - Seidlitz, Harald K. A1 - Thiel, Stephan T1 - Simulation von Globalstrahlung in Expositionskammern T2 - Umwelteinflüsse - erfassen, simulieren, bewerten“, Tagungsband der 23. Jahrestagung der Gesellschaft für Umweltsimulation, 09.-11. März 1994, Pfinztal/Karlsruhe KW - Globalstrahlung KW - Simulation Y1 - 1994 SP - 257 EP - 269 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Stiehler, Johannes A1 - Böwering, Norbert A1 - Heinzmann, Ulrich T1 - Soft x-ray spectrum of a laser-produced gallium plasma JF - Journal of Physics B Atomic Molecular and Optical Physics KW - Röntgenspektrum KW - Lasererzeugtes Plasma Y1 - 1994 VL - 27 IS - October SP - L663 EP - L669 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Thiel, Stephan A1 - Seidlitz, Harald K. A1 - Payer, Hans D. T1 - UV filters for lighting of plants T2 - Proceedings International Lighting in Controlled Environments Workshop, NASA Conference Publication No. CP-3309 (1995), NASA Kennedy Space Genter, Houston, USA KW - Ultraviolett KW - Filter KW - Pflanze KW - Beleuchtung Y1 - 1995 SP - 381 EP - 387 ER - TY - CHAP A1 - Köfferlein, Matthias A1 - Döhring, Thorsten A1 - Seidlitz, Harald K. A1 - Payer, Hans D. T1 - Xenon lighting adjusted to plant requirements T2 - Proceedings International Lighting in Controlled Environments Workshop, NASA Conference Publication No. CP-3309 (1995), NASA Kennedy Space Genter, Houston, USA KW - Xenon KW - Pflanze KW - Beleuchtung Y1 - 1995 SP - 229 EP - 241 ER - TY - CHAP A1 - Seidlitz, Harald K. A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Payer, Hans D. A1 - Thiel, Stephan T1 - Provision of UV Irradiation for Experimental Plant Ecology T2 - Proceedings 1st European Symposium on Effects of Environmental UV Radiation, Munich, 27-29 October 1993, EUR 15607 Y1 - 1995 SP - 33 EP - 39 PB - European Community CY - Brüssel ER - TY - JOUR A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Payer, Hans D. A1 - Seidlitz, Harald K. A1 - Thiel, Stephan T1 - Simulation von Globalstrahlung in Expositionskammern JF - VFI - Der Versuchs- und Forschungsingenieur KW - Globalstrahlung KW - Simulation Y1 - 1995 VL - 1995 IS - 28 SP - 43 EP - 46 ER - TY - JOUR A1 - Krüger, Malte T1 - Was dem EWS geschehen ist JF - Wirtschaftsdienst KW - Europäisches Währungssystem Y1 - 1992 VL - 72 IS - 10 SP - 516 EP - 519 ER - TY - JOUR A1 - Krüger, Malte T1 - Das Currency Board System JF - Das Wirtschaftsstudium (WISU) KW - Currency Board KW - Wechselkurspolitik Y1 - 1994 VL - 1994 IS - 10 SP - 783 EP - 787 ER - TY - JOUR A1 - Krüger, Malte T1 - Inflation and Growth: a Discussion of Robert J. Barro's Recent Findings JF - Intereconomics KW - Inflation KW - Geldpolitik Y1 - 1995 VL - 30 IS - 6 SP - 301 EP - 304 ER - TY - JOUR A1 - Krüger, Malte T1 - Endogenes Geld? JF - Die Bank KW - Geldpolitik Y1 - 1996 VL - 1996 IS - 3 SP - 150 EP - 153 ER - TY - JOUR A1 - Krüger, Malte T1 - Staatsbankrotte: Es gab sie, und es wird sie geben JF - Orientierungen zur Wirtschafts- und Gesellschaftspolitik KW - Staatsbankrott Y1 - 1996 VL - 68 IS - 2 SP - 8 EP - 13 ER - TY - JOUR A1 - Krüger, Malte A1 - Andrés, Javier A1 - Hernando, Ignacio T1 - Cómo incide el régimen cambiario en la mediación de los costes de la inflación? JF - Boletín Económico KW - Wechselkurspolitik KW - Inflation Y1 - 1996 VL - 1996 IS - Mai SP - 49 EP - 57 ER - TY - JOUR A1 - Krüger, Malte T1 - Der Buffer Stock Ansatz in der Geldtheorie JF - Das Wirtschaftsstudium (WISU) KW - Geldtheorie Y1 - 1996 VL - 1996 IS - 12 SP - 1077 EP - 1080 ER - TY - JOUR A1 - Krüger, Malte T1 - Was besagen hohe Devisenmarktumsätze? JF - Zeitschrift für das gesamte Kreditwesen KW - Devisenmarkt Y1 - 1997 VL - 1997 IS - 3 SP - 109 EP - 114 ER - TY - JOUR A1 - Krüger, Malte T1 - Die währungspolitische Bedeutung des Delta-Hedging JF - Die Bank KW - Währungspolitik KW - Hedging Y1 - 1998 VL - 1998 IS - 7 SP - 443 EP - 445 ER - TY - JOUR A1 - Krüger, Malte A1 - Godschalk, Hugo T1 - Herausforderungen des bestehenden Geldsystems im Zuge seiner Digitalisierung – Chancen für Innovationen? JF - TA-Datenbank-Nachrichten KW - Elektronischer Zahlungsverkehr Y1 - 1998 VL - 7 IS - 2 SP - 8 EP - 14 ER - TY - JOUR A1 - Krüger, Malte A1 - Godschalk, Hugo T1 - Why e-money still fails JF - Card Forum International KW - Elektronischer Zahlungsverkehr Y1 - 2001 VL - 2001 IS - September/October SP - 24 EP - 27 ER - TY - THES A1 - Rauer, Miriam T1 - Der Einfluss von Poren auf die Zuverlässigkeit der Lötverbindungen von Hochleistungs-Leuchtdioden KW - Lötverbindung KW - Lumineszenzdiode Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:29-opus4-104749 SN - 978-3-96147-158-4 ER - TY - CHAP A1 - Hartge, Jörg A1 - Bernhard, Germar A1 - Döhring, Thorsten A1 - Jahnke, Jörn A1 - Kokott, Dieter A1 - Köhl, Michael A1 - Schröder, Christian A1 - Trubiroha, Peter T1 - Strahlungsmessung in der Bewitterungsprüfung - Ergebnisse eines Rundversuchs T2 - Umwelteinflüsse - erfassen, simulieren, bewerten“, Tagungsband der 25. Jahrestagung der Gesellschaft für Umweltsimulation, 13.-15. März 1996, Pfinztal/Karlsruhe KW - Umwelt KW - Simulation Y1 - 1996 IS - V16 SP - 16-1 EP - 16-15 ER - TY - THES A1 - Lantzberg, Daniel T1 - Quantum Frames and Uncertainty Principles arising from Symplectomorphisms KW - Signalverarbeitung KW - Phasenraum Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:46-00107143-11 ER - TY - JOUR A1 - Krüger, Malte A1 - Böhle, Knud T1 - Payment Cultures and Internet Payment Systems – Comparing EU and US JF - Wirtschaftspolitische Blätter KW - Elektronischer Zahlungsverkehr KW - Europäische Union KW - USA Y1 - 2002 VL - 49 IS - 2 SP - 137 EP - 145 ER - TY - JOUR A1 - Krüger, Malte A1 - Hinrichs, Jens-Werner A1 - Stroborn, Karsten T1 - Internet Payment Services: PayPal - reif für den deutschen Markt? JF - Die Bank KW - PayPal Y1 - 2004 VL - 2004 IS - 8 SP - 62 EP - 66 ER - TY - JOUR A1 - Krüger, Malte A1 - Morath, Florian T1 - "Burden of debt“ in HIPC countries in the light of current account statistics JF - Intereconomics KW - Schuldenerlass Y1 - 2007 VL - 42 IS - 2 SP - 105 EP - 108 ER - TY - JOUR A1 - Krüger, Malte A1 - Strauch, Christoph T1 - Preserving interchange: from explicit to implicit MIF JF - European Card Review KW - Elektronischer Zahlungsverkehr KW - Kreditkarte Y1 - 2008 VL - 3 IS - January/February SP - 21 EP - 24 ER - TY - JOUR A1 - Krüger, Malte A1 - Strauch, Christoph T1 - Die Kommission und die Interchange: Falsche Prämissen? JF - Cards Karten Cartes KW - Elektronischer Zahlungsverkehr KW - Kreditkarte Y1 - 2008 VL - 18 IS - 3 SP - 25 EP - 29 ER - TY - JOUR A1 - Krüger, Malte T1 - Cash – the familiar stranger JF - European Card Review KW - Bargeld Y1 - 2008 IS - September/October SP - 30 EP - 34 ER - TY - JOUR A1 - Krüger, Malte T1 - Interbankenentgelte - ökonomisch notwendig oder wettbewerbsverzerrend? JF - Zeitschrift für das gesamte Kreditwesen KW - Elektronischer Zahlungsverkehr KW - Kreditkarte Y1 - 2009 VL - 62 IS - 17 SP - 822 EP - 825 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Thiel, Stephan A1 - Seidlitz, Harald K. T1 - UV-B simulation according to global change scenarios T2 - Proceedings of the 10th International Congress of Radiation Research, August 27 - September 1,1995, Würzburg / Germany KW - Ultraviolett B Y1 - 1995 VL - 1 SP - 406 ER - TY - CHAP A1 - Thalmair, Michaela A1 - Graf, Ursula A1 - Schraudner, Martina A1 - Döhring, Thorsten A1 - Langebartels, Christian A1 - Sandermann, Heinrich T1 - Reactions of pathogenesis-related proteins towards global change parameters in tobacco T2 - Conference on Vegetation Stress, Munich, Germany; 01/1995 KW - Pflanzenphysiologie KW - Tabak Y1 - 1995 ER - TY - CHAP A1 - Langebartels, Christian A1 - Thalmair, Michaela A1 - Bauw, Guy A1 - Schraudner, Martina A1 - Anegg, Sabine A1 - Graf, Ursula A1 - Döhring, Thorsten A1 - Ernst, Dieter A1 - Sandermann, Heinrich T1 - Reactions of pathogenesis-related proteins towards ozone and UV-B radiation T2 - IVth International Workshop on Pathogenesis-Related Proteins in Plants, Kloster Irsee, Germany; 01/1995 KW - Pflanzenphysiologie KW - Ozon KW - Ultraviolett B Y1 - 1995 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Thiel, Stephan A1 - Seidlitz, Harald K. T1 - Spectral Shaping of Artificial UV-B Irradiation for Vegetation Stress Research JF - Journal of Plant Physiology KW - Ultraviolett B KW - Ozon KW - Pflanzenphysiologie Y1 - 1996 VL - 148 IS - 1-2 SP - 115 EP - 119 ER - TY - JOUR A1 - Thalmair, Michaela A1 - Bauw, Guy A1 - Thiel, Stephan A1 - Döhring, Thorsten A1 - Langebartels, Christian A1 - Sandermann, Heinrich T1 - Ozone and ultraviolet B effects on the defense-related ß-1 ,3-glucanase and chitinase in tobacco JF - Journal of Plant Physiology KW - Pflanzenphysiologie KW - Ozon KW - Ultraviolett B KW - Tabak Y1 - 1996 VL - 148 IS - 1-2 SP - 222 EP - 228 ER - TY - GEN A1 - Mann, Michael A1 - Döhring, Thorsten A1 - Pribulla, Theodor A1 - Komzik, Richard A1 - Sivanic, Peter A1 - Stollenwerk, Manfred ED - Skopal, Augustin T1 - Power quality evaluation for observatories N2 - Within the project SLOBATCO the question did arise, to what extend observatories have to rely on adequate power quality, e.g. the perfect sinusoidal shape of supply voltage and current, in order to ensure safe operation and accurate measurement results. International power quality standards are put in perspective with requirement specifications. Telescope operators indicate partial or total loss of function of measurement instruments. Measurements conducted during SLOBATCO project substantiate the need for power quality measurement campaigns. N2 - Poster KW - instrumentation KW - site testing KW - telescope KW - Sternwarte KW - Elektrizitätsversorgung Y1 - 2019 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Pribulla, Theodor A1 - Komzik, Richard A1 - Mann, Michael A1 - Sivanic, Peter A1 - Stollenwerk, Manfred T1 - Slovak-Bavarian collaboration on the development of telescope instrumentation JF - Contributions of the Astronomical Observatory Skalnate Pleso N2 - Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of scientific instrumentation for the new Ø1.3 m astronomical telescope at the Skalnaté Pleso observatory. The joint project is funded by the Bavarian Academic Center for Central, Eastern and Southeastern Europe (BAYHOST). Planned technical work packages are targeting the filter wheel software for the VIS camera, additional IR filters, and an upgrade of the mirror coating facility by additional sputtering equipment. KW - telescope KW - instrumentation KW - filter KW - camera KW - coating KW - Spiegelteleskop Y1 - 2019 UR - https://www.ta3.sk/caosp/Eedition/FullTexts/vol49no2/pp154-158.pdf VL - 2019 IS - 49 / 2 SP - 154 EP - 158 ER - TY - JOUR A1 - Krüger, Malte A1 - Judt, Ewald T1 - Ein europäisches Kartensystem – für immer ein Phantom? JF - Cards Karten Cartes KW - Bargeldloser Zahlungsverkehr Y1 - 2014 VL - 25 IS - Mai SP - 29 EP - 33 ER - TY - JOUR A1 - van Baal, Sebastian A1 - Hinrichs, Jens-Werner A1 - Krüger, Malte T1 - Umsatz vs. Sicherheit im Online-Handel? Ergebnisse einer Händlerbefragung zum Management von Zahlungsausfällen JF - Der Betriebswirt KW - Electronic Commerce KW - Risikomanagement Y1 - 2009 VL - 50 IS - 4 SP - 28 EP - 33 ER - TY - JOUR A1 - Krüger, Malte T1 - Card Rewards: Is There a ‘Reverse-Robin-Hood-Effect’ JF - Banking & Financial Services Policy Report KW - Bargeldloser Zahlungsverkehr Y1 - 2015 VL - 34 IS - 3 SP - 20 EP - 25 ER - TY - JOUR A1 - Krüger, Malte A1 - Seitz, Franz T1 - Bargeldlos oder bar jeglichen Verstands? Was die Abschaffung des Bargeldes bringt oder eben gerade nicht JF - ifo-Schnelldienst KW - Bargeldloser Zahlungsverkehr Y1 - 2015 VL - 68 IS - 13 SP - 9 EP - 12 ER - TY - JOUR A1 - Krüger, Malte T1 - Pros y contras del efectivo: ¿cuál es el estado del debate? JF - Boletín cemla KW - Bargeldloser Zahlungsverkehr Y1 - 2016 VL - LXII IS - 4 SP - 377 EP - 397 ER - TY - JOUR A1 - Thiel, Stephan A1 - Döhring, Thorsten A1 - Köfferlein, Matthias A1 - Kosak, Andre A1 - Martin, Peter A1 - Seidlitz, Harald K. T1 - A phytotron for plant stress research : how far can artificial light compare to natural sunlight? JF - Journal of Plant Physiology KW - Phytotron KW - Pflanzenphysiologie Y1 - 1996 VL - 148 IS - 3-4 SP - 456 EP - 463 ER - TY - JOUR A1 - Schnitzler, Jörg-Peter A1 - Langebartels, Christian A1 - Heller, Werner A1 - Liu, Jinchen A1 - Lippert, Michael A1 - Döhring, Thorsten A1 - Bahnweg, Günther A1 - Sandermann, Heinrich T1 - Ameliorating effect of UV-B radiation on the response of Norway spruce and Scots pine to ambient ozone concentrations JF - Global change biology KW - Ultraviolett B KW - Ozon KW - Fichte KW - Kiefer, Gattung Y1 - 1999 VL - 5 IS - 1 SP - 83 EP - 94 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Aschenbach, Bernd A1 - Bräuninger, Heinrich W. A1 - Burkert, Wolfgang A1 - Egger, Roland A1 - Oppitz, Andreas T1 - Die MPE Testanlage PANTER: Simulation von Sternenlicht zur Charakterisierung von Röntgensatelliten T2 - Umwelteinflüsse - erfassen, simulieren, bewerten“, Tagungsband der 26. Jahrestagung der Gesellschaft für Umweltsimulation, 12.-14.März 1997, Pfinztal/Deutschland KW - Röntgenstrahlung KW - Satellit Y1 - 1997 SP - 7 EP - 13 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Aschenbach, Bernd A1 - Bräuninger, Heinrich W. A1 - Burkert, Wolfgang A1 - Egger, Roland A1 - Oppitz, Andreas T1 - Charakterisierung von Röntgensatelliten JF - Hf-Report: Hochfrequenztechnik, Optoelektronik, Mikrowellentechnik, Kommunikationstechnik KW - Röntgenstrahlung KW - Satellit Y1 - 1997 VL - 11 IS - 4 SP - 30 EP - 34 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Aschenbach, Bernd A1 - Bräuninger, Heinrich W. A1 - Briel, Ulrich G. A1 - Burkert, Wolfgang A1 - Egger, Roland A1 - Hasinger, Günther A1 - Hippmann, Horst A1 - Kendziorra, Eckhard A1 - Oppitz, Andreas A1 - Pfeffermann, Elmar A1 - Predehl, Peter A1 - Strüder, Lothar A1 - Trümper, Joachim Ernst T1 - X-ray qualification of the ABRIXAS telescope JF - Astronomical Notes - Astronomische Nachrichten KW - Spiegelteleskop Y1 - 1998 VL - 319 IS - 1-2 SP - 140 EP - 140 ER - TY - CHAP A1 - Friedrich, Peter A1 - Bräuninger, Heinrich W. A1 - Burkert, Wolfgang A1 - Döhring, Thorsten A1 - Egger, Roland A1 - Hasinger, Günther A1 - Oppitz, Andreas A1 - Predehl, Peter A1 - Trümper, Joachim Ernst T1 - X-ray tests and calibrations of the ABRIXAS mirror systems T2 - Proceedings of SPIE KW - Spiegelteleskop Y1 - 1998 VL - 3444 SP - 369 EP - 379 ER - TY - CHAP A1 - Altmann, Jürgen A1 - Egle, Wilhelm J. A1 - Hafner, Wolfgang A1 - Derst, Gerhard A1 - Matthes, Axel A1 - Döhring, Thorsten T1 - Fabrication of a demonstration mandrel for ESA's XEUS mirror development program T2 - Proceedings of SPIE KW - Röntgenteleskop Y1 - 2000 VL - 4012 SP - 559 EP - 566 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Morian, Hans F. T1 - An eye on the sky JF - GLASS - Monthly Journal of the European Glass Industry KW - Glas Y1 - 2000 VL - 2000 IS - 77 SP - 370 EP - 371 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Morian, Hans F. T1 - Optical glasses and glass ceramics for large optical systems T2 - Proceedings of SPIE KW - Zerodur KW - Glaskeramik Y1 - 2003 VL - 4842 SP - 56 EP - 66 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Thomas, Armin T1 - Zerodur mandrels for the next generation of x-ray telescopes T2 - Proceedings of SPIE KW - Röntgenteleskop Y1 - 2003 VL - 4851 SP - 647 EP - 655 ER - TY - RPRT A1 - Krüger, Malte T1 - Speculation, Hedging and Arbitrage in the Foreign Exchange Market T2 - Bank of Spain, Working Paper 9606 KW - Devisenmarkt Y1 - 1996 ER - TY - RPRT A1 - Krüger, Malte T1 - Dynamic Hedging in Currency Crisis T2 - Department of Economics, University of Western Ontario, Research Report 9811 KW - Zinsänderung KW - Währungskrise Y1 - 1998 ER - TY - RPRT A1 - Krüger, Malte T1 - Exchange Rate Effects of Portfolio Shifts? T2 - Department of Economics, University of Western Ontario, Research Report 9818 KW - Zinsänderung KW - Wechselkursänderung Y1 - 1998 ER - TY - CHAP A1 - Döhring, Thorsten T1 - Hochschule Aschaffenburg T2 - Deutsche Raumfahrtakteure : Bundesländer – Organisation – Raumfahrt – raumfahrtbasierte Anwendungen N2 - Die Hochschule Aschaffenburg zeichnet sich durch wirtschaftsnahe, überwiegend interdisziplinäre und innovative Studiengänge aus. Enge Kooperationen mit Unternehmen sowie Partnerschaften mit ausländischen Hochschulen garantieren den Studierenden, dass sie praxisrelevantes Wissen erwerben, welches für eine erfolgreiche Arbeit in einer zunehmend globalen Arbeitswelt erforderlich ist. Professorinnen und Professoren der Fakultät Ingenieurwissenschaften sind mit ihren Forschungsteams über internationale Kooperationen an mehreren Raumfahrtprojekten beteiligt. Es werden Spiegelschichten für Röntgensatelliten entwickelt, Katalysatoren für Raketentriebwerke beschichtet und die Auswirkungen kosmischer Strahlung auf das Herz-Kreislauf-System und auf Gehirnzellen untersucht. Die Ergebnisse werden in wissenschaftlichen Publikationen und auf Fachkonferenzen präsentiert. Studierende sind über Spezialvorlesungen und Abschlussarbeiten zu Raumfahrtthemen hierbei mit eingebunden. KW - Raumfahrt KW - Beschichtung KW - Raumfahrttechnik KW - Hochschule Aschaffenburg Y1 - 2018 UR - https://www.dlr-innospace.de/?smd_process_download=1&download_id=2044 SP - 87 EP - 87 PB - Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) CY - Köln ER - TY - RPRT A1 - Krüger, Malte T1 - Towards a Moneyless World? T2 - Department of Economics and Finance, University of Durham, Working Paper 9916 KW - Bargeldloser Zahlungsverkehr Y1 - 1999 ER - TY - GEN A1 - Döhring, Thorsten A1 - Gösling, Lukas A1 - Pribulla, Theodor A1 - Komzik, Richard T1 - Segmented infrared filters for the 1.3m telescope in the Slovak Tatra Mountains N2 - Since 2015, the Astronomical Institute of the Slovak Academy of Sciences (AI SAS) is operating a modern EU-funded reflecting telescope with a 130 cm primary mirror, located in the Skalnaté Pleso Observatory in the Tatra Mountains at an altitude of 1783 m. In 2018, the funding agency BAYHOST granted the proposed project SLOBATCO to Aschaffenburg University of Applied Sciences. The cooperation project pursues the development of astronomical NIR filters, which are designed for the atmospheric transmission windows in the infrared spectral range. In order to avoid a complex cryogenic filter wheel for the NIR CCD camera operated at low temperatures, the observations should be realized through a segmented filter using precise shifts of the image field. The bi-national cooperation project and the specification of the infrared filter combination are presented in this poster contribution. N2 - Poster KW - telescope KW - filter KW - infrared KW - Spiegelteleskop Y1 - 2019 UR - https://doi.org/10.17876/plate/lswst/058 ER - TY - RPRT A1 - Krüger, Malte T1 - The Demand for Currency in Germany T2 - Department of Economics and Finance, University of Durham, Working Paper 2007 KW - Geldpolitik Y1 - 2000 ER - TY - RPRT A1 - Goodhart, Charles A1 - Krüger, Malte T1 - The Impact of Technology on Cash Usage T2 - Financial Markets Group, London School of Economics, Discussion paper 374 KW - Elektronischer Zahlungsverkehr Y1 - 2001 ER - TY - RPRT A1 - Krüger, Malte T1 - Money: A Market Microstructure Approach T2 - ROME Discussion Paper Series, No 08-01, January 2008 KW - Geldtheorie Y1 - 2008 ER - TY - RPRT A1 - Krüger, Malte T1 - The Pricing of Payments T2 - ROME Discussion Paper Series, No 09-08, October 2009 KW - Preispolitik Y1 - 2009 ER - TY - RPRT A1 - Krüger, Malte T1 - Sezession: Ein gefährliches Spiel T2 - ROME Discussion Paper Series, No 13-02, July 2013 KW - Europäische Union KW - Wirtschafts- und Währungsunion KW - Austritt Y1 - 2013 ER - TY - RPRT A1 - Krüger, Malte T1 - Target-balances: The Greek Example T2 - ROME Discussion Paper Series, No 13-15, November 2013 KW - Europäische Union KW - Bankenkrise KW - Griechenland Y1 - 2013 ER - TY - RPRT A1 - Krüger, Malte T1 - Do the Poor Pay for Card Rewards of the Rich? T2 - ROME Discussion Paper Series, No 2014-08, September 2014 KW - Bargeldloser Zahlungsverkehr Y1 - 2014 ER - TY - RPRT A1 - Krüger, Malte T1 - The spread of branch banking and the demand for cash in post-war Germany T2 - ROME Discussion Paper Series, No 2016-09, October 2016 KW - Bargeldloser Zahlungsverkehr KW - Lohn Y1 - 2016 ER - TY - GEN A1 - Jost, Thomas A1 - Toedter, Karl-Heinz T1 - Kritisches und Konstruktives zur Defizitregel in der EWU T2 - ETH Zürich News Ökonomenstimme KW - Europäische Währungsunion KW - Fiskalpolitik KW - Haushaltsdefizit Y1 - 2019 IS - 01. April 2019 ER - TY - RPRT A1 - Jost, Thomas T1 - Von der Troika zu einem Europäischen Währungsfonds - Welche Aufgaben und Grenzen sollte ein Europäischer Währungsfonds nach den Erfahrungen mit der Troika haben? T2 - Weidener Diskussionspapiere Nr. 66 KW - Europäische Kommission KW - Internationaler Währungsfonds KW - Europäischer Zentralbank KW - Europäische Union Y1 - 2019 ER - TY - RPRT A1 - Krüger, Malte T1 - Money and Credit: Lessons of the Irish bank strike of 1970 T2 - ROME Discussion Paper Series, No 2017-13, June 2017 KW - Irland KW - Bank KW - Streik KW - Handelskredit Y1 - 2017 ER - TY - CHAP A1 - Ghigo, Mauro A1 - Citterio, Oberto A1 - Mazzoleni, Francesco A1 - Pareschi, Giovanni A1 - Aschenbach, Bernd A1 - Bräuninger, Heinrich W. A1 - Friedrich, Peter A1 - Hasinger, Günther A1 - Döhring, Thorsten A1 - Esemann, Hauke A1 - Jedamzik, Ralf A1 - Hölzel, Eva A1 - Parodi, Giancarlo T1 - The manufacturing of the XEUS x-ray glass segmented mirrors: status of the investigation and last results T2 - Proceedings of SPIE KW - Spiegelteleskop Y1 - 2004 VL - 5168 SP - 180 EP - 195 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Hartmann, Peter T1 - Forming mandrels for x-ray telescopes made of modified Zerodur T2 - Proceedings of SPIE KW - Zerodur KW - Glaskeramik KW - Spiegelteleskop Y1 - 2004 VL - 5168 SP - 148 EP - 156 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Jedamzik, Ralf T1 - ZERODUR mirror blanks for ELTs: technology and production capacity at SCHOTT T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur Y1 - 2004 VL - 5382 SP - 285 EP - 295 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Wittmer, Volker T1 - Production of the 4.1-m Zerodur mirror blank for the VISTA Telescope T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur Y1 - 2004 VL - 5494 SP - 340 EP - 349 ER - TY - CHAP A1 - Hartmann, Peter A1 - Döhring, Thorsten T1 - Mirror blank production for ELTs T2 - Instrumentation for Extremely Large Telescopes : a Workshop held at Ringberg Castle, Bavaria, 25-29 July 2005 ; proceedings KW - Spiegelteleskop Y1 - 2005 PB - Max-Planck-Institut für Astronomie CY - Heidelberg ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter T1 - Large Lenses and Filters for ELTs : Challenges and Opportunities for SCHOTT T2 - Instrumentation for Extremely Large Telescopes : Proceedings of a Workshop held at Ringberg Castle ; 25-29 July 2005 KW - Spiegelteleskop Y1 - 2005 SP - 33 EP - 37 PB - MPIA CY - Heidelberg ER - TY - CHAP A1 - Jedamzik, Ralf A1 - Döhring, Thorsten A1 - Müller, Rolf T1 - Homogeneity of the coefficient of linear thermal expansion of ZERODUR T2 - Proceedings of SPIE KW - Zerodur KW - Spiegelteleskop Y1 - 2005 VL - 5868 IS - 58680S ER - TY - THES A1 - Kowalski, Thomas T1 - Mess- und Betriebsverfahren von stromrichtergespeisten Drehfeldmaschinen mit supraleitender Statorwicklung KW - Leistungselektronik KW - Messverfahren KW - Supraleitung Y1 - 2019 SN - 978-3-8440-6670-8 PB - Shaker CY - Herzogenrath ER - TY - CHAP A1 - Kreß, Viktor A1 - Jung, Janis A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Human Pose Estimation in Real Traffic Scenes T2 - 2018 IEEE Symposium Series on Computational Intelligence (SSCI) KW - Autonomes Fahrzeug KW - Fahrerassistenzsystem KW - Fußgänger KW - Radfahrer Y1 - 2018 U6 - https://doi.org/10.1109/SSCI.2018.8628660 SP - 518 EP - 523 PB - IEEE CY - Bangalore, India ER - TY - THES A1 - Trautmann, Anika T1 - Zwei-Photonen-Polymerisation als Methode zur Herstellung medizintechnischer Funktionselemente KW - Polymere KW - Lasertechnik Y1 - 2018 UR - https://tuprints.ulb.tu-darmstadt.de/8363/ ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Jedamzik, Ralf T1 - Status of ZERODUR mirror blank production at SCHOTT T2 - Proceedings of SPIE KW - Zerodur KW - Spiegelteleskop Y1 - 2005 VL - 5869 IS - 586902 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Jedamzik, Ralf T1 - Properties of Zerodur mirror blanks for extremely large telescopes T2 - Proceedings of SPIE KW - Zerodur KW - Spiegelteleskop Y1 - 2006 VL - 6148 IS - 61480G ER - TY - CHAP A1 - Schneider-Störmann, Ludger ED - Kempter, Karl ED - Haußelt, Jürgen T1 - Dünnschicht-Technologie: Verfahren und Qualitätskontrolle von integrierten keramischen Kondensatoren T2 - Werkstoffwoche '98 Symposium 12 Mikrotechnik KW - Dünnschichttechnologie KW - Dünnschichttechnik Y1 - 1998 SP - 249 EP - 254 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Schneider-Störmann, Ludger ED - Görne, Jobst T1 - Strukturelle Analyse von Verhandlungssituationen JF - Performance of Sales Engineers N2 - Verhandlungssituationen beziehen stets mehr Organisationen, Gruppen und Individuen ein, als nur diejenigen Partner, die schließlich in der Verhandlung einander gegenüber sitzen. Im Technischen Vertrieb hilft die strukturelle Analyse der Verhandlungssituation, Klarheit über Zahl und Ziele dieser sichtbaren und unsichtbaren Teilnehmer zu gewinnen. Die Beziehungen der einzelnen Individuen zueinander können einfach visualisiert werden. Zusätzlich eignet sich diese Methode, bestehende aber auch potenzielle Konflikte zu identifizieren und ihren Ursachen bzw. Quellen zuzuordnen. Eine Vorbereitung auf diese Konflikte ist somit möglich und lässt diese in der Verhandlung durch dediziertes Konfliktmanagement schon in deren Entstehung entsprechend behandeln. Die Zielsetzung der Verhandlung, also die Einigung mit dem größten Nutzen für beide Verhandlungspartner, wird durch Anwendung der strukturellen Analyse der Verhandlungssituation zielgerichtet und konfliktarm möglich. KW - Business-to-Business-Marketing Y1 - 2015 VL - 1 IS - 1 SP - 1 EP - 4 ER - TY - JOUR A1 - Schneider-Störmann, Ludger ED - Jokiniemi, Sini T1 - Why the Analysis of the Buying Centre Isn’t Enough JF - Journal of Excellence in Sales N2 - Today, buying and selling in B2B needs improved methods. A classical approach is to analyse the so called “Buying Centre”. This article shows an improved, more comprehensive approach to be better prepared ahead of a negotiation. This is seen from the sales engineer’s viewpoint and should be a helpful tool for anyone involved in sales. In the first paragraph, this article briefly describes the sales/buying process, showing what is happening in the supplying company. Part of the preparation of a sales person is to identify the player in the buying centre. The meaning of these players is described in Section 2. Section 3 of this article focuses on the lack of information if only the buying centre is analysed and gives examples. The 4th section shows the method of improved analysis of negotiation preparation. KW - Business-to-Business-Marketing KW - Vertriebsingenieur Y1 - 2018 UR - https://issuu.com/turunamk/docs/journal_of_excellence_in_sales_1_20_dab0654f76d63e VL - 3 IS - 1 SP - 13 EP - 16 ER - TY - CHAP A1 - Schneider-Störmann, Ludger T1 - Voraussetzung für die Implementierung von Smart Services im IoT T2 - Smart Services und Internet der Dinge KW - Business-to-Business-Marketing KW - IoT KW - Vertriebsingenieur KW - Systemtheorie des Technischen Vertriebs SToTS Y1 - 2017 UR - https://www.hanser-elibrary.com/doi/abs/10.3139/9783446452701.006 SP - 91 EP - 105 PB - Hanser CY - München ER - TY - BOOK A1 - Schneider-Störmann, Ludger T1 - Technische Produkte verkaufen mit System N2 - Der unentbehrliche Leitfaden für den Technischen Vertrieb Hochpreisige technische Produkte zu verkaufen erfordert besonderes Wissen. Sie müssen dem Kunden genau das anbieten, was er haben will und was er braucht. Der Preis darf nicht zu hoch sein, die Lieferzeit nicht zu lange. Auf der anderen Seite muss es für Sie ein gutes Geschäft sein. So etwas funktioniert nur, wenn man die rein vertriebliche Sicht durch eine ingenieurtechnische Perspektive ergänzt. In diesem Buch erfahren Sie: - was ein(e) Vertriebsingenieur(in) können muss - wie Zielkonflikte strategisch und taktisch gelöst werden können - wie Verhandlungsprozesse durch neue Medien und Technologien verändert werden - wie entscheidend die Systemtheorie der Technik für Ihren Erfolg im Technischen Vertrieb ist und - wie Sie erprobte Methoden effizient kombinieren und einsetzen, sei es QFD oder das Kano-Modell. Dieses Buch unterstützt Sie darin, systematisch die technischen Produktmerkmale herauszuarbeiten, die Ihre Kunden begeistern und Bereitschaft wecken, für diesen Mehrwert auch einen höheren Preis zu akzeptieren. KW - Business-to-Business-Marketing KW - Technisches Produkt KW - Verkaufstechnik KW - Technischer Vertrieb KW - Vertriebsingenieur KW - Systemtheorie des Technischen Vertriebs SToTS KW - Konfliktmanagement KW - CSQFD Y1 - 2015 SN - 978-3-446-44414-0 PB - Hanser CY - München ER - TY - CHAP A1 - Döhring, Thorsten A1 - Loosen, Klaus-Dieter A1 - Hartmann, Peter T1 - The technical challenge of large ELT filters T2 - Proceedings of SPIE KW - Filter Y1 - 2006 VL - 6273 IS - 62730U ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Hartmann, Peter T1 - ZERODUR mirror substrates for solar Telescopes T2 - Modern Solar Facilities – Advanced Solar Science : Proceedings of a Workshop held at Göttingen September 27-29, 2006 KW - Zerodur KW - Spiegelteleskop Y1 - 2007 SP - 77 EP - 82 PB - Universitätsverlag CY - Göttingen ER - TY - CHAP A1 - Hartmann, Peter A1 - Nattermann, Kurt A1 - Döhring, Thorsten T1 - Strength aspects for the design of ZERODUR glass ceramics structures T2 - Proceedings of SPIE KW - Zerodur KW - Glaskeramik Y1 - 2007 VL - 6666 IS - 666603 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf T1 - Manufacturing of lightweighted ZERODUR components at SCHOTT T2 - Proceedings of SPIE KW - Zerodur KW - Spiegelteleskop Y1 - 2007 VL - 6666 IS - 666602 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Hartmann, Peter T1 - Mirrors for solar telescopes made from ZERODUR glass ceramic T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2007 VL - 6689 IS - 66890X ER - TY - JOUR A1 - Krüger, Malte T1 - Money and Credit : Lessons of the Irish bank strike of 1970 JF - Credit and Capital Markets - Kredit und Kapital KW - Irland KW - Bank KW - Streik KW - Handelskredit Y1 - 2018 SN - 2199-1227 VL - 51 IS - 4 SP - 645 EP - 667 ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Klopp, Marco A1 - Stegmann, Patricia A1 - Abke, Jörg T1 - An Evaluation of Competency-Oriented Instructional Tasks for Internal Differentiation in Basics of Programming T2 - 21th International Conference on Interactive Collaborative Learning (ICL) KW - Hochschuldidaktik Y1 - 2018 SP - 865 EP - 874 PB - Springer ER - TY - CHAP A1 - Haak, Valentin A1 - Abke, Jörg A1 - Borgeest, Kai T1 - Work-in-Progress: Development of a LEGO Mindstorms EV3 Simulation for Programming in C T2 - 21th International Conference on Interactive Collaborative Learning (ICL) KW - LEGO MindStorms Y1 - 2018 SP - 1870 EP - 1877 PB - Springer ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Stegmann, Patricia A1 - Abke, Jörg T1 - Using Competency-Oriented Instructional Tasks for Internal Differentiation in Informatics KW - Hochschuldidaktik Y1 - 2018 SP - 26 EP - 33 PB - ACM ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - Using Grounded Theory Methodology to Discover Undergraduates’ Preconceptions of Software Engineering T2 - 2018 IEEE Global Engineering Education Conference (EDUCON) KW - Software Engineering Y1 - 2018 SP - 707 EP - 711 PB - IEEE ER - TY - CHAP A1 - Klopp, Marco A1 - Haak, Valentin A1 - Abke, Jörg T1 - The Influence of German School on Heterogeneity of Knowledge in Informatics in the Study T2 - 2018 IEEE Global Engineering Education Conference (EDUCON) KW - Hochschuldidaktik Y1 - 2018 SN - 2165-9567 SP - 497 EP - 502 PB - IEEE ER - TY - GEN A1 - Döhring, Thorsten A1 - Hudec, Rene T1 - Optics development for X-ray astronomy – a review on four joint Bavarian-Czech projects N2 - In the years 2016 to 2018 the Bavarian-Czech Academic Agency (BTHA) funded in summary four bilateral projects between Aschaffenburg University and CVUT Prague: JEUMICO, TRILAMICO, JODEXRA, and AXROCO. The effective combination of equipment, manpower, and know-how of both partners resulted in the development of stress-compensated iridium coatings for astronomical X-ray mirrors. The findings have been published at scientific conferences and in joint papers. This poster gives a review on the social , political and educational aspects of the collaborations in form of a photo documentation. N2 - Poster KW - X-ray KW - astronomy KW - iridium KW - coating KW - Röntgenspiegel KW - Astronomie Y1 - 2018 SP - 1 EP - 1 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Schreiber, Ulrich T1 - Glaskeramik – Fundament für höchste Präzision JF - Photonik KW - Glaskeramik Y1 - 2008 SN - 1432-9778 IS - 2 SP - 52 EP - 55 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Thomas, Armin A1 - Hartmann, Peter T1 - Forty years of ZERODUR mirror substrates for astronomy: review and outlook KW - Spiegelteleskop KW - Zerodur Y1 - 2008 VL - 7018 IS - 70183B ER - TY - CHAP A1 - Hartmann, Peter A1 - Nattermann, Kurt A1 - Döhring, Thorsten T1 - ZERODUR glass ceramics: strength data for the design of structures with high mechanical stresses T2 - Proceedings of SPIE KW - Glaskeramik KW - Spiegelteleskop KW - Zerodur Y1 - 2008 VL - 7018 IS - 70180O ER - TY - JOUR A1 - Dluhosch, Barbara A1 - Krüger, Malte T1 - Struktureller Anpassungsbedarf bei hohen Kapitalimporten und festen Wechselkursen – Der Fall Spanien JF - Zeitschrift für Wirtschaftspolitik KW - Spanien KW - Wechselkurspolitik Y1 - 1991 VL - 1991 IS - 2 SP - 157 EP - 180 ER - TY - JOUR A1 - Krüger, Malte T1 - Geldpolitische Sonderfaktoren - Die Bundesbank zwischen kurzfristiger Zinssteuerung und mittelfristiger Geldmengenpolitik JF - Zeitschrift für Wirtschaftspolitik KW - Bundesbank KW - Geldmenge Y1 - 1994 VL - 43 IS - 2 SP - 225 EP - 247 ER - TY - JOUR A1 - Krüger, Malte T1 - Der Wechselkurs als Spielball der Spekulanten? JF - Zeitschrift für Wirtschaftspolitik KW - Wechselkurspolitik Y1 - 1995 VL - 44 IS - 1 SP - 45 EP - 84 ER - TY - JOUR A1 - Andrés, Javier A1 - Hernando, Ignacio A1 - Krüger, Malte T1 - Growth, inflation and the exchange rate regime JF - Economics Letters KW - Inflation KW - Wechselkurspolitik Y1 - 1996 VL - 53 IS - 1 SP - 61 EP - 65 ER - TY - JOUR A1 - Dluhosch, Barbara A1 - Freytag, Andreas A1 - Krüger, Malte T1 - Gains From Trade in a Deficit-Ridden Economy: Note JF - Journal of Institutional and Theoretical Economics (JITE) KW - USA KW - Leistungsbilanzdefizit Y1 - 1998 VL - 154 IS - 4 SP - 680 EP - 687 ER - TY - JOUR A1 - Krüger, Malte T1 - Monetary Policy Implications of Digital Money: A Comment JF - Kyklos KW - Elektronischer Zahlungsverkehr Y1 - 1999 VL - 52 IS - 2 SP - 259 EP - 262 ER - TY - JOUR A1 - Krüger, Malte T1 - Dynamic Hedging in Currency Crisis JF - Economics Letters KW - Zinsänderung KW - Währungskrise Y1 - 1999 VL - 62 IS - 3 SP - 347 EP - 350 ER - TY - JOUR A1 - Krüger, Malte T1 - Offshore e-money issuers and monetary policy JF - First Monday KW - Elektronischer Zahlungsverkehr Y1 - 2001 VL - 6 IS - 10 SP - 1 EP - 1 ER - TY - JOUR A1 - Drehmann, Mathias A1 - Goodhart, Charles A1 - Krüger, Malte A1 - Boldrin, Michele A1 - Rose, Andrew T1 - 10. The challenges facing currency usage: will the traditional transactions medium be able to resist competition from the new technologies? JF - Economic Policy KW - Elektronischer Zahlungsverkehr Y1 - 2002 VL - 17 IS - 34 SP - 193 EP - 227 ER - TY - JOUR A1 - Jost, Thomas T1 - Bei der Euro-Reform werden die Weichen falsch gestellt JF - Börsenzeitung KW - Internationaler Währungsfonds KW - Euro, Währungsunion, ESM Y1 - 2018 VL - 2018 IS - Nr. 229 SP - 6 EP - 6 ER - TY - JOUR A1 - Baal, Sebastian van A1 - Hinrichs, Jens-Werner A1 - Krüger, Malte T1 - Welche Zahlungsverfahren kommen im Internet zum Einsatz? Ein erklärendes Partialmodell und empirische Anzeichen für seine Gültigkeit JF - Banking and Information Technology KW - Elektronischer Zahlungsverkehr Y1 - 2006 VL - 2006 IS - 2 SP - 9 EP - 19 ER - TY - JOUR A1 - Krüger, Malte T1 - The Elasticity Pricing Rule for Two-sided Markets : A Note JF - Review of Network Economics KW - Preisbildung Y1 - 2009 VL - 8 IS - 3 SP - 271 EP - 278 ER - TY - JOUR A1 - Krüger, Malte T1 - Money: A Market Microstructure Approach JF - Journal of Money, Credit and Banking KW - Bargeldloser Zahlungsverkehr Y1 - 2012 SN - 0022-2879 VL - 44 IS - 6 SP - 1245 EP - 1258 ER - TY - JOUR A1 - Krüger, Malte A1 - Judt, Ewald T1 - A European card payments scheme : Forever a phantom? JF - Journal of Payments Strategy & Systems KW - Kartengesteuertes Zahlungssystem Y1 - 2013 SN - 1750-1806 VL - 7 IS - 4 SP - 344 EP - 358 ER - TY - JOUR A1 - Krüger, Malte T1 - Do the Poor Pay for Card Rewards of the Rich? JF - Review of Economics KW - Kartengesteuertes Zahlungssystem Y1 - 2015 SN - 2366-035X VL - 66 IS - 2 SP - 129 EP - 154 ER - TY - JOUR A1 - Krüger, Malte T1 - The introduction of cashless wage payments and the spread of branch banking in post-war Germany JF - Financial History Review KW - Bargeldloser Zahlungsverkehr KW - Lohn Y1 - 2017 VL - 24 IS - 2 SP - 185 EP - 207 ER - TY - JOUR A1 - Krüger, Malte T1 - Ein Drei-Punkte-Plan zur Reform der Geldpolitik JF - Credit and Capital Markets - Kredit und Kapital KW - Geldpolitik Y1 - 2013 SN - 2199-1227 VL - 46 IS - 4 SP - 421 EP - 437 ER - TY - JOUR A1 - Krüger, Malte T1 - Pros and cons of cash : The state of the debate JF - Credit and Capital Markets - Kredit und Kapital KW - Bargeldloser Zahlungsverkehr KW - Bargeld Y1 - 2018 SN - 2199-1227 VL - 51 IS - 1 SP - 15 EP - 40 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Krauße, Sylvana A1 - Schneider-Störmann, Ludger T1 - Der Studiengang Internationales Technisches Vertriebsmanagement an der Hochschule Aschaffenburg – Ausbildung von Vertriebsingenieuren für einen globalen Markt T2 - Internationalisierung der Curricula in den MINT-Fächern N2 - Die Wettbewerbsfähigkeit der Exportnation Deutschland erfordert hervorragend ausgebildete Vertriebsingenieure. Dieses Ausbildungsziel verfolgt der Studiengang „Internationales Technisches Vertriebsmanagement“ an der Hochschule Aschaffenburg. Als Besonderheit komplettiert ein für alle Studierende verpflichtender Auslandsaufenthalt die international ausgerichtete Ausbildung. Neben Lehrveranstaltungen in englischer Sprache gibt es eine internationale Projektwoche als Maßnahme zur “Internationalisation at Home”. Der Studiengang ist über die „Academic Association of Sales Engineering“ international vernetzt. KW - MINT KW - Vertriebsmanagement KW - Hochschule KW - Aschaffenburg KW - Internationalisierung Y1 - 2018 U6 - https://doi.org/10.3278/6004649w SP - 161 EP - 170 PB - wbv Media CY - Bielefeld ER - TY - THES A1 - Bestel, Robert T1 - Simulation neuronaler Aktionspotentiale in Hinblick auf Zellform und Physiologie sowie deren Ableitung mittels extarzellulärer Mikroelektroden KW - Mikroelektrode KW - Nervenzelle Y1 - 2018 U6 - https://doi.org/10.18453/rosdok_id00002390 ER - TY - THES A1 - Hahn, Stefan T1 - Methoden zur nichtlinearen modellbasierten Spurführung benutzerdefinierter Punkte an der Fahrzeugfront KW - Personenkraftwagen KW - Spurführung Y1 - 2017 ER - TY - THES A1 - Amrhein, Sebastian T1 - Wertstoffkreisläufe im Kontext neuer Mobilitätskonzepte KW - Elektrofahrrad KW - Kreislaufwirtschaft KW - Nachhaltigkeit KW - Recycling KW - Ressourcenökonomie Y1 - 2017 UR - https://opus.bibliothek.uni-augsburg.de/opus4/4072 ER - TY - THES A1 - Wölfel, Maximilian T1 - Hochintegriertes hardwaregestütztes Messverfahren zur Untersuchung von fehlerbehafteten Übertragungskanälen in TETRA-Objektfunkversorgungen KW - TETRA, Telekommunikation Y1 - 2018 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:91-diss-20180404-1403407-1-3 ER - TY - THES A1 - Rücker, Johannes T1 - Automatisierte Detektion und Extraktion von Elektroschrott-Komponenten mit Methoden der Bildverarbeitung und des maschinellen Lernens im Hinblick auf Tantal-Recycling KW - Elektronikschrott KW - Recycling Y1 - 2017 UR - http://geb.uni-giessen.de/geb/volltexte/2017/13368/ ER - TY - THES A1 - Lieb, Florian T1 - The Affine Uncertainty Principle, Associated Frames and Applications in Signal Processing KW - Signalverarbeitung KW - Wavelet Y1 - 2018 UR - https://elib.suub.uni-bremen.de/peid=D00106720 ER - TY - BOOK A1 - Dluhosch, Barbara A1 - Freytag, Andreas A1 - Krüger, Malte T1 - Leistungsbilanzsalden und internationale Wettbewerbsfähigkeit KW - Internationale Wettbewerbsfähigkeit KW - Leistungsbilanz KW - Leistungsbilanzdefizit Y1 - 1992 PB - Institut für Wirtschaftspolitik an der Universität Köln CY - Köln ER - TY - BOOK A1 - Dluhosch, Barbara A1 - Freytag, Andreas A1 - Krüger, Malte T1 - International competitiveness and the balance of payments : do current account deficits and surpluses matter? KW - Zahlungsbilanz KW - Internationale Wettbewerbsfähigkeit Y1 - 1996 SN - 1-85898-210-3 PB - Elgar CY - Cheltenham ER - TY - BOOK A1 - Krüger, Malte A1 - Godschalk, Hugo T1 - Herausforderung des bestehenden Geldsystems im Zuge seiner Digitalisierung - Chancen für Innovationen? : Gutachten der PaySys GmbH im Rahmen des Projekts "Technikfolgenabschätzung zu elektronischen Zahlungssystemen für digitale Produkte und Dienstleistungen im Internet" (PEZ) KW - Zahlungsverkehr KW - Digitalisierung Y1 - 1998 PB - FZKA CY - Karlsruhe ER - TY - BOOK A1 - Krüger, Malte A1 - Seitz, Franz T1 - Kosten und Nutzen des Bargelds und unbarer Zahlungsinstrumente : der Nutzen von Bargeld ; Modul 2 KW - Bargeld KW - Elektronischer Zahlungsverkehr Y1 - 2017 PB - Knapp CY - Frankfurt am Main ER - TY - BOOK A1 - Krüger, Malte T1 - Finanzmarktungleichgewichte und Wechselkursvolatilität : zur Bedeutung der internationalen Finanzmärkte für die Entwicklung der Wechselkurse Y1 - 1994 SN - 3-921471-82-6 PB - Institut für Wirtschaftspolitik an der Universität Köln CY - Köln ER - TY - BOOK A1 - Metz, Rainer A1 - Krüger, Malte T1 - E-Commerce in China and Germany : a Sino-German comparative analysis KW - Electronic Commerce KW - China KW - Deutschland Y1 - 2012 SN - 978-3-406-63016-3 PB - Beck CY - München ER - TY - BOOK A1 - Krüger, Malte A1 - Seitz, Franz T1 - Kosten und Nutzen des Bargelds und unbarer Zahlungsinstrumente : Übersicht und erste Schätzungen ; Modul 1 KW - Bargeld KW - Elektronischer Zahlungsverkehr Y1 - 2014 PB - Deutsche Bundesbank CY - Frankfurt am Main ER - TY - THES A1 - Goldhammer, Michael T1 - Selbstlernende Algorithmen zur videobasierten Absichtserkennung von Fußgängern KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2016 U6 - https://doi.org/10.19211/KUP9783737602532 ER - TY - THES A1 - Mayer, Margot T1 - Einfluss ionisierender Strahlung auf die elektrophysiologischen Eigenschaften sich entwickelnder neuronaler Netzwerke KW - Ionisierende Strahlung KW - Neuronales Netz Y1 - 2017 UR - http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-70283 ER - TY - THES A1 - Dressler, Katharina T1 - Bildung von Hohlräumen in lokalen Rückseitenkontakten bei Passivated Emitter and Rear Solarzellen KW - Solarzelle KW - Aluminium KW - Silicium KW - Kontaktieren KW - Hohlraum Y1 - 2016 UR - http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-211482 ER - TY - THES A1 - Rosenberger, Manuel T1 - Polymere planare Bragg-Gitter KW - Bragg-Reflektor KW - Optischer Sensor Y1 - 2018 SN - 978-3-8440-6008-9 PB - Shaker ER - TY - THES A1 - Nick, Christoph T1 - Mikrointegrierte Nanostrukturen mit hohem Aspektverhältnis als neuronale Schnittstelle KW - Neuronales Netz KW - Mikroelektrode Y1 - 2015 UR - http://tuprints.ulb.tu-darmstadt.de/4595/7/Dissertation%20-%20Christoph%20Nick.pdf ER - TY - BOOK A1 - Döhring, Thorsten T1 - Das laserinduzierte Plasma - eine Röntgenlichtquelle N2 - Dissertation KW - Lasererzeugtes Plasma Y1 - 1993 ER - TY - CHAP A1 - Jedamzik, Ralf A1 - Hengst, Joachim A1 - Elsmann, Frank A1 - Lemke, Christian A1 - Döhring, Thorsten A1 - Hartmann, Peter T1 - Optical materials for astronomy from SCHOTT: the quality of large components T2 - Proceedings of SPIE KW - Spiegelteleskop Y1 - 2008 VL - 7018 IS - 70180O ER - TY - JOUR A1 - Döhring, Thorsten T1 - From Heidelberg to Hawaii: SCHOTT’s Century of Astronomy JF - 400 Years of the Telescope Newsletter KW - Spiegelteleskop Y1 - 2008 VL - 1 IS - 9 SP - 2 EP - 7 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Westerhoff, Thomas T1 - Four decades of ZERODUR mirror substrates for astronomy T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 VL - 7281 IS - 728103 ER - TY - CHAP A1 - Hartmann, Peter A1 - Nattermann, Kurt A1 - Döhring, Thorsten T1 - ZERODUR® glass ceramics for high stress applications T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 VL - 7425 IS - 74250M ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Lentes, Frank-Thomas T1 - Heritage of ZERODUR® glass ceramic for space applications T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 VL - 7425 IS - 74250L ER - TY - CHAP A1 - Jedamzik, Ralf A1 - Döhring, Thorsten A1 - Johannsson, Thoralf T1 - CTE characterization of ZERODUR® for the ELT century T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 VL - 7425 IS - 742504 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Schreiber, Ulrich T1 - Glass ceramics – foundation for highest precision JF - Photonik international KW - Glaskeramik Y1 - 2009 VL - 2009 IS - 1 SP - 17 EP - 19 ER - TY - CHAP A1 - Kling, Günther A1 - Lucarelli, Stefano A1 - Hartmann, Peter A1 - Nattermann, Kurt A1 - Döhring, Thorsten A1 - Kuhr, Markus A1 - Thomas, Peter T1 - Double Ring Tests on ZERODUR K20 and Etched ZERODUR T2 - Proceedings 11th European Conference on Spacecraft Structures, Materials and Mechanical Testing, 15-17 Sep 2009, Toulouse, France KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 ER - TY - GEN A1 - Hartmann, Peter A1 - Döhring, Thorsten A1 - Schäfer, Martin T1 - Glass Ceramic ZERODUR® for Space Application T2 - DGaO-Proceedings N2 - Poster KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 SN - 1614-8436 VL - 2009 ER - TY - CHAP A1 - Haak, Valentin A1 - Abke, Jörg A1 - Borgeest, Kai T1 - Conception of a LEGO Mindstorms EV3 Simulation for Programming in C in computer science courses T2 - 2018 IEEE Global Engineering Education Conference (EDUCON) KW - LEGO MindStorms Y1 - 2018 U6 - https://doi.org/10.1109/EDUCON.2018.8363269 SN - 2165-9567 SP - 478 EP - 483 PB - IEEE ER - TY - GEN A1 - Hudec, Rene A1 - Pina, Ladislav A1 - Marsikova, Veronika A1 - Inneman, Adolf A1 - Döhring, Thorsten ED - Deutsche Gesellschaft für angewandte Optik, T1 - Lobster Eye X-ray Optics for Astrophysics: Recent Status N2 - X-ray optics in LE (Lobster Eye) arrangement represent important part of future X-ray wide field telescopes and monitors. We will present some new results in the design, development, tests and applications of LE X-ray optics with emphasis on astrophysics. N2 - Poster KW - X-ray KW - telescope KW - astrophysics KW - Röntgenteleskop Y1 - 2018 UR - https://www.dgao-proceedings.de/download/119/119_p23.pdf SP - 1 EP - 1 ER - TY - GEN A1 - Hudec, Rene A1 - Pina, Ladislav A1 - Marsikova, Veronika A1 - Inneman, Adolf A1 - Döhring, Thorsten ED - Deutsche Gesellschaft für angewandte Optik, T1 - Kirkpatrick Baez X-ray Optics for Astrophysics: Recent Status N2 - X-ray optics in KB (Kirkpatrick Baez) arrangement represent promising alternative to Wolter optics in common use. We will present some new results including KB module developed and tested in X-rays within the EU AHEAD project. N2 - Poster KW - X-ray KW - telescope KW - astrophysics KW - Röntgenteleskop Y1 - 2018 UR - https://www.dgao-proceedings.de/download/119/119_p22.pdf SP - 1 EP - 1 ER - TY - JOUR A1 - Probst, Anne-Catherine A1 - Begou, Thomas A1 - Döhring, Thorsten A1 - Zeising, Sebastian A1 - Stollenwerk, Manfred A1 - Stadtmüller, Johannes A1 - Emmerich, Florian A1 - Lumeau, Julien ED - Publishing OSA, T1 - Coating stress analysis and compensation for iridium-based x-ray mirrors JF - Applied Optics N2 - Iridium-based coatings for mirrors of x-ray telescopes are studied. In particular, stress-induced deformation is characterized and shown to be compressive and equal to −1786  MPa. Two methods for stress compensation are then studied. One relies on the deposition of silica on the back surface of the substrate and a second one relies on the deposition of a chromium sublayer. Advantages and drawbacks of each of these techniques are presented. KW - iridium KW - coating stress KW - X-ray KW - mirror KW - astronomy KW - Röntgenteleskop KW - Iridium KW - Spiegelteleskop Y1 - 2018 UR - https://doi.org/10.1364/AO.57.008775 VL - 2018 IS - 57 (29) SP - 8775 EP - 8779 ER - TY - GEN A1 - Döhring, Thorsten A1 - Probulla, Theodor A1 - Komzik, Richard A1 - Mann, Michael A1 - Sivanic, Peter A1 - Stollenwerk, Manfred ED - Hambalek, Lubomir T1 - Slovak-Bavarian collaboration on the development of telescope instrumentation N2 - Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of the new Ø1.3 m astronomical telescope and the corresponding scientific instrumentation. The project is funded by the Bavarian Academic Center for Central, Eastern and Southeastern Europe (BAYHOST). Technical work packages are targeting filter wheel software for the VIS camera, additional IR filters, and an upgrade of the mirror coating facility by additional sputtering equipment. N2 - Poster KW - telescope KW - astronomy KW - instrumentation KW - Spiegelteleskop Y1 - 2018 UR - https://www.ta3.sk/conferences/75AI2018/posters/AP06.pdf ER - TY - JOUR A1 - Lieb, Florian A1 - Stark, Hans-Georg T1 - Audio inpainting: Evaluation of time-frequency representations and structured sparsity approaches JF - Signal Processing N2 - Audio signals such as music are known to exhibit distinct and sparse time-frequency patterns. In particular, the short-time Fourier/Gabor transform is widely used for sparsely representing audio signals. In this contribution, such sparsity patterns are exploited to reconstruct missing samples. The quality of reconstruction is evaluated for various kinds of proximal splitting algorithms, time-frequency discretizations and sparsity enforcing constraints. Furthermore, given a time-frequency representation, we investigate the performance of synthesis vs. analysis approaches to the reconstruction problem. The equidistant discretization scheme of Gabor transforms is non-adaptive. It is plausible, that more flexible time-frequency representations like wavelets or ERBlets improve reconstruction of missing audio samples. The numerical results presented in this contribution confirm this conjecture and lead to good reconstruction results even for gaps of contiguously missing samples, whose size is notably larger than reported for inpainting experiments carried out previously. KW - Audio inpainting, Structured sparsity, Proximal splitting, Synthesis/analysis, Non-stationary Gabor frames KW - Zeit-Frequenz-Darstellung KW - Tonsignal Y1 - 2018 UR - https://doi.org/10.1016/j.sigpro.2018.07.012 VL - 2018 IS - 153 SP - 291 EP - 299 ER - TY - JOUR A1 - Probst, Anne-Catherine A1 - Stollenwerk, Manfred A1 - Emmerich, Florian A1 - Büttner, Andre A1 - Zeising, Sebastian A1 - Stadtmüller, Johannes A1 - Riethmüller, Franziska A1 - Stehlikova, Veronika A1 - Mingwu, Wen A1 - Proserpio, Laura A1 - Damm, Christine A1 - Rellinghaus, Bernd A1 - Döhring, Thorsten T1 - Influence of sputtering pressure on the nanostructure and the X-ray reflectivity of iridium coatings JF - Surface and Coatings Technology N2 - Reflective mirror coatings made of iridium are used in X-ray telescopes of the Chandra X-ray Observatory (CXO) launched in 1999 by the National Aeronautics and Space Administration (NASA) to investigate astronomical sources at photon energies below 10. keV. These coatings were produced in a DC magnetron sputtering process and have so far proven their suitability for space-based applications. We are considering in the present paper the processing of thin iridium films for lightweight telescopes using the radio frequency magnetron sputtering technique with an oblique angle deposition. The coating development presented here is focused on the influence of total sputtering pressure on film properties as well as on its impact on the mirror's performance. Characterisation methods such as X-ray diffractometry, X-ray reflectometry, atomic force microscopy and transmission electron microscopy have been used. Correlations between morphology, density, surface micro-roughness, crystal structure of the iridium layer and the expected reflectivity of the X-ray mirror are described and discussed. KW - Iridium KW - sputtering KW - microstructure KW - coating KW - X-ray KW - Iridium KW - Röntgenteleskop Y1 - 2017 UR - https://doi.org/10.1016/j.surfcoat.2017.10.062 SN - 0257-8972 VL - 2017 IS - 343 SP - 101 EP - 107 ER - TY - JOUR A1 - Büttner, Andre A1 - Probst, Anne-Catherine A1 - Emmerich, Florian A1 - Damm, Christine A1 - Rellinghaus, Bernd A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred T1 - Influence of Sputtering Pressure on the Microstructure and Layer Properties of Iridium Thin Films JF - Thin Solid Films N2 - Iridium layers with low stress, high density, and low surface roughness find widespread use in different high-technology applications. This paper presents a study of the influence of the sputtering pressure on the properties of iridium thin films and of its effect on the substrate surface microstructure. We analysed the dependence of the microstructure, crystalline structure, electrical resistivity, and deposition rate on the sputtering pressure and surface defects of the substrate. For the latter, plasma etching of the substrate was performed for different processing times and its effect on the surface roughness of substrates and, subsequently, on the grown iridium films, was examined. The sputtering pressure and the substrate plasma etching time both had a strong influence on the microstructure and surface roughness. These microstructural changes are in good agreement with the tendency described in the Thornton Structure-Zone Model for different sputtering pressures and the microstructure phase map of Alvarez. The electrical resistivity, deposition rate, and crystalline structure were highly dependent on the sputtering pressure. KW - Iridium KW - microstructure KW - TEM KW - sputtering KW - thin films KW - Iridium KW - Dünne Schicht Y1 - 2018 UR - https://doi.org/10.1016/j.tsf.2018.06.056 SN - 0040-6090 VL - 2018 IS - 662 SP - 41 EP - 46 ER - TY - JOUR A1 - Stehlikova, Veronika A1 - Probst, Anne-Catherine A1 - Nentvich, Ondrej A1 - Urban, Martin A1 - Sieger, Ladislav A1 - Döhring, Thorsten A1 - Hudec, René ED - Skopal, Augustín T1 - Study of multiple layers coatings for X–ray mirrors JF - Contributions of the Astronomical Observatory Skalnaté Pleso N2 - This paper focuses on a theoretical background that motivated the experimental campaign of multiple layer coatings of X-ray mirrors, and the first results of the testing of the prepared samples. Simulations of the use of different overcoats were performed in order to improve the reflectivity of thin iridium coatings designed for X-ray optics effective in the energy up to 10 keV. Samples based on these simulations were prepared and are being tested for the properties that influence the X-ray optical performance, such as layer homogeneity, density and surface micro-roughness. Further the topic of the coating stress was addressed, as it is an issue in case of thin, lightweight X-ray mirrors and affects the time stability of layers. The discussion and preliminary results conclude our contribution. KW - X-ray KW - optics KW - coating KW - reflectivity KW - iridium KW - Röntgenspiegel KW - Iridium Y1 - 3018 UR - https://www.ta3.sk/caosp/Eedition/Abstracts/2018/Vol_48/No_3/pp488-497_abstract.html VL - 2018 IS - 48 SP - 488 EP - 497 ER - TY - JOUR A1 - Döhring, Thorsten A1 - Hudec, Rene ED - Skopal, Augustín T1 - JEUMICO and TRILAMICO: Dimensions of successful Bavarian-Czech cooperation JF - Contributions of the Astronomical Observatory Skalnaté Pleso N2 - In December 2017 the two projects JEUMICO (an acronym for Joint European Mirror Cooperation) and TRILAMICO (standing for Trilateral Mirror Collaboration) are ending. Different aspects of this Bavarian-Czech collaboration between Aschaffenburg University and the Czech Technical University in Prague are discussed. The multiple dimensions of this cooperation are scientific achievements, public relation measures, internationalization of education, financial aspects, inter-cultural communication, and also the actual political situation within Europe. KW - JEUMICO KW - TRILAMICO KW - BTHA KW - Iridium KW - astronomy KW - Röntgenspiegel KW - Spiegelteleskop Y1 - 2018 UR - https://www.astro.sk/caosp/Eedition/Abstracts/2018/Vol_48/No_3/pp430-436_abstract.html VL - 2018 IS - Vol. 48 / 3 SP - 430 EP - 436 ER - TY - JOUR A1 - Probst, Anne-Catherine A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Mingwu, Wen A1 - Proserpio, Laura ED - Cugny, Bruno ED - Karafolas, Nikos ED - Sodnik, Zoran T1 - Iridium coatings for space based x-ray optics JF - Proceedings of SPIE N2 - Future investigations of astronomical X-ray sources require light weight telescope systems with large collecting areas and good angular resolution. The Wolter I type telescope design offers a suitable possibility for obtaining performant X-ray mirrors with high collecting areas. The technology based on replicated slumped glass optics using thin glasses thereby provides the opportunity to fulfil the light weight and mass production requirements. In NASA's telescope NuSTAR this technology has been proven as advantageous compared to previous systems. Coating thin glasses with iridium, gold or platinum enhances the reflectivity of X-ray mirrors. KW - Iridium KW - coating KW - X-ray KW - astronomy KW - mirror KW - Iridium KW - Spiegelteleskop KW - Röntgenastronomie Y1 - 2017 U6 - https://doi.org/10.1117/12.2296167 VL - 2017 IS - 10562 SP - 105621E-01 EP - 105621E-09 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Zeising, Sebastian T1 - Analyse der Schichtspannungen von Röntgenspiegeln mit einem Weißlichtinterferometer T2 - DGaO-Proceedings N2 - An der Hochschule Aschaffenburg werden iridiumbasierte Schichtsysteme für röntgenastronomische Anwendungen hergestellt. Unter Nutzung eines Weißlichtinterferometers wurde hierfür ein Verfahren zur Vermessung der inhärenten Schichtspannungen entwickelt. Erste vielversprechende Ergebnisse von spannungsarmen Röntgenreflexionsbeschichtungen werden vorgestellt. KW - Röntgenspiegel KW - Interferometer KW - Iridium KW - Schichtspannung Y1 - 2018 UR - https://www.dgao-proceedings.de/download/119/119_p10.pdf SN - 1614-8436 VL - 2018 IS - 2018 SP - P10-1 EP - P10-2 PB - Deutsche Gesellschaft für angewandte Optik e.V. CY - Erlangen ER - TY - BOOK A1 - Borgeest, Kai T1 - EMC and Functional Safety of Automotive Electronics N2 - Experience in automotive industry shows that there are in particular two technical reasons why electronic systems in vehicles do not work as expected: software bugs and electromagnetic interference. Malfunctions are more than a mere annoyance, they can damage cars or other goods, injure people or kill people. This book focuses on electromagnetic compatibility (EMC) keeping a close relation to functional safety as required by ISO 26262. It first introduces functional safety and EMC experts to automotive electronics. Since functional safety is still an emerging field, a primer might be useful to automotive engineers and EMC engineers as well. It then introduces to EMC. Signal and power integrity are topics which share the same fundamentals as EMC and are also relevant in some cases. In automotive industry the V-model is still common to describe a development process. For this reason it is necessary to discuss the model and to integrate the safety life cycle and the EMC design flow into the model. After the lecture the reader should be able to recognize and avoid hazards, to avoid expensive EMC problems, to simulate and test for EMC compliance of the car and its components and to fix problems. It helps to learn automotive EMC and functional safety and will stay a reference book after lecture. The book considers all levels from the whole car down to the single electronic control unit (ECU). EMC on integrated circuit level is considered in a few points which are relevant to vehicles. Additionally the charging infrastructure for electric cars is considered. KW - EMC KW - functional safety KW - automotive electronics KW - Elektromagnetische Verträglichkeit KW - Kraftfahrzeugelektronik Y1 - 2018 SN - 978-1-78561-408-8 PB - IET CY - Stevenage ER - TY - CHAP A1 - Wegener, Georg T1 - Concepts and Methods from the Field of Vehicle Dynamics for Safety Considerations of Light Electric Vehicles T2 - LEVS2017 - Light Electric Vehicle Summit, 22-23 November 2017, Rotterdam, Netherlands N2 - Vehicle dynamic considerations regarding the safety of lightweight vehicles need to cover different aspects than those regarding conventional automobiles. New problems and effects require dedicated research and modified methods. The present contribution discusses these new challenges covering aspects like specific vehicle design concepts (e.g. three-wheelers) and the significance of human body mass in relation to the total mass. Some initial simulation results are presented that were gained with an example design of a three-wheeled two seater vehicle. The results show that the seating position and number of passengers have a significant influence on the stability against rollover. Thus they illustrate that the mass of the human body is of importance for the dynamic behaviour of the overall system. The article gives a list of further effects like the stiffness and damping properties of the human body and also the influence of the human as part of the system in terms of control engineering. A strategy is suggested which combines computer simulation and road tests. This strategy minimizes the need for costly testbed experiments for optimizing the simulation models. Particularly when simulation is employed in order to reduce the need for sensors that would require complicated structural modification (e.g. force sensors in suspension components). Ideally, sensor application can be limited to inertial sensors and other positioning sensors like GPS. KW - light electric vehicles KW - vehicle dynamics KW - multi body system simulation KW - inertial sensors KW - model verification KW - Leichtfahrzeug KW - Fahrzeugdynamik Y1 - 2017 ER - TY - CHAP A1 - Wegener, Georg T1 - Drehmomentaufnehmer T2 - Messtechnik und Prüfstände für Verbrennungsmotoren N2 - Unter den vielen Messgrößen, die im Betrieb eines Motorenprüfstands erfasst werden müssen, kommt dem Drehmoment eine besonders wichtige Rolle zu. In diesem Kapitel werden nach einer grundlegenden Klassifizierung und Beschreibung der Messprinzipien die in dieser Anwendung besonders wichtigen Prinzipien tiefergehend diskutiert. Das sind zum einen die Messung des Reaktionsdrehmoments mit Hilfe einer Pendelmaschine und zum anderen die Messung mit Hilfe von mitrotierenden Drehmomentaufnehmern mit berührungsloser Übertragung. Als zugrundeliegendes Messprinzip für die mechanische Last wird insbesondere das Prinzip der Dehnungsmessstreifen näher erläutert. Weitere Abschnitte widmen sich der Messgenauigkeit, den unterschiedlichen Bauformen, welche unterschiedliche Montage- und Anschluss-Varianten bedingen sowie der Kalibrierung von Drehmomentaufnehmern. KW - Kraftfahrzeugtechnik KW - Verbrennungsmotor KW - Messtechnik KW - Drehmoment KW - Drehmomentaufnehmer Y1 - 2016 UR - https://www.springer.com/de/book/9783658101176 SN - 978-3-658-10118-3 SP - 155 EP - 186 PB - Springer-Vieweg CY - Wiesbaden ER - TY - CHAP A1 - Alber, Oliver A1 - Ehehalt, Ulrich A1 - Markert, Richard A1 - Wegener, Georg ED - Awrejcewicz, Jan T1 - Experimental observations on rotor-to-stator contact T2 - Vibration, Control and Stability of Dynamical Systems N2 - If a flexible rotor contacts its stator, the nonlinearities induced by contact may result in a great variety of vibration phenomena. This article presents experimental results gained at test rigs. Fundamental phenomena are analyzed and discussed. First, a modular kit for rotordynamic experiments is described. The kit allows customizing the properties of rotor and stator that are relevant for the dynamic behavior. The system allows to specify target values for natural frequencies, modal damping, clearance width, contact fric- tion and others. Basic con� gurations based on this kit were used to study the in uence of mass, sti� ness and damping of both rotor and stator, contact fric- tion and misalignment of the stator on the vibration of the rotor-stator system. Extensions of the kit allowed the experimental investigation of systems with a multitude of natural frequencies, highly exible stators and even drop down and overload incidents of rotors supported by active magnetic bearings. The article also analyzes and explains the various vibration phenomena resulting from contact. In particular, resonance diagrams from run-up and run-down processes, orbit plots and frequency spectra are utilized to discuss the dynamic characteristics. The motion types encountered include not only rotor syn- chronous motions, but also multi frequency motions (forward and backward whirl), sub- and super-harmonic motions, motions including sidebands as well as chaotic motions. Emphasis is put on sensitive system parameters and on existence and stability of the various types of motion. KW - Rotor, Maschine KW - Ständer, Technik Y1 - 2017 SN - 978-83-935312-5-7 SP - 9 EP - 24 PB - DSTA CY - Lodz, Poland ER - TY - CHAP A1 - Jost, Thomas T1 - Geldpolitik, Preisniveaustabilität und Finanzstabilität, Koreferat zu Albrecht Michler und Franz Seitz BT - Ordnungsdefizite und Lösungsansätze T2 - Wirtschaftspolitik im Wandel KW - Geldpolitik KW - Preisniveau, Europäische Zentralbank, Geldpolitische Ziele KW - Preisstabilität Y1 - 2018 SN - 978-3-11-055486-1 SP - 205 EP - 209 PB - De Gruyter CY - Oldenbourg ER - TY - GEN A1 - Kück, Nico-Wei T1 - In Vitro Platform for Acoustic and Electrophysiological Investigations of Ultrasound Neuromodulation N2 - The quality of life has increased dramatically over the past decades. Approximately one billion individuals worldwide will be aged 65 years or older by 2030. With the increasing age of human population, prevalence of neurodegenerative ailments, such as Parkinson’s disease or Alzheimer’s disease, increases. Brain pacemakers are proposed to treat their symptoms. They provide the electrical stimulation of neuronal regions of the central or peripheral nervous system. But for the implantation of brain pacemakers, surgery is needed. Those surgical interventions can be avoided by using transcranial stimulation methods such as Transcranial Magnetic Stimulation (TMS). However, magnetic fields lack the possibility of focusing. Ultrasound (US) offers transcranial characteristics as well and allows focusing on a specific target area in the brain. Over 60 years ago, the Hodgkin-Huxley (H-H) model was presented to simulate the electrophysiological activity of neurons but it lacks to describe the impact of mechanical soundwaves on action potentials in a neuron. N2 - Poster KW - In Vitro, Ultrasound, Neuromodulation, Neuron KW - Nervenstimulation KW - Ultraschall Y1 - 2017 ER - TY - CHAP A1 - Reuter, Rebecca A1 - Hauser, Florian A1 - Gold-Veerkamp, Carolin A1 - Stark, Theresa A1 - Kis, Juliane A1 - Mottok, Jürgen A1 - Abke, Jörg A1 - Meyer, Dany T1 - Towards the Construction of a Questionnaire for the Identification of Learning Obstacles T2 - 2018 IEEE Global Engineering Education Conference (EDUCON) KW - Hochschuldidaktik KW - Fragebogen Y1 - 2018 SP - 463 EP - 472 PB - IEEE ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - Using Grounded Theory Methodology to Discover Undergraduates’ Preconceptions of Software Engineering KW - Software Engineering KW - Grounded theory Y1 - 2018 SP - 713 EP - 717 PB - IEEE ER - TY - THES A1 - Daus, Andreas T1 - Zellbasierte Biosensoren – Hybride Systeme aus dreidimensionalen in vitro Netzwerken und Mikroelektroden Arrays N2 - Mit der Entwicklung hybrider Strukturen aus Mikroelektroden Arrays und dreidimensionalen Sphäroiden wurde in dieser Arbeit ein funktionaler, deskriptiver Ansatz der Biosensorik adressiert. Während biochemische Sensoren ausschließlich analytische Informationen über die Wechselwirkung von Liganden und Rezeptoren liefern, erlauben zellbasierte Biosensoren eine physiologische Beschreibung biologischer Systeme in nativen bzw. chemisch oder physikalisch provozierten Zuständen. Dies impliziert für Anwendungen der Pharmakologie, Toxikologie und Grundlagenforschung hohes Potenzial, evoziert jedoch eine multidisziplinäre Aufgabe. Es werden zum einen in vitro Systeme benötigt, die den Ansprüchen eines physiologisch repräsentativen Abbilds eines Organismus genügen. Zum anderen sind technische Systeme erforderlich, die Zellreaktionen qualitativ und quantitativ verwertbar machen. KW - Array KW - Biosensor Y1 - 2013 ER - TY - THES A1 - Frieß, Johannes T1 - Einfluss ionisierender Strahlung auf die elektrophysiologischen Eigenschaften kardialer Zellen N2 - Die zentrale Fragestellung der Strahlenbiologie behandelt die Wirkung von ionisierender Strahlung auf biologische Systeme. Zwar sind die bei Exposition mit ionisierender Strahlung entstehenden Gesundheitsrisiken bekannt, dennoch sind die Strahlungseffekte auf das Herz immer noch nicht sehr gut verstanden. Dabei ist die Exposition mit hohen Dosen ionisierender Strahlung ein anerkannter Risikofaktor in Bezug auf kardiovaskuläre Erkrankungen. KW - Elektrophysiologie KW - Herzmuskelzelle Y1 - 2016 ER - TY - JOUR A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Real-space measurement of potential distribution in PECVD ONO electrets by Kelvin probe force microscopy JF - Nanotechnology N2 - Multilayers of silicon oxide/silicon nitride/silicon oxide (ONO) are known for their good electret properties due to deep energy traps near the material interfaces, facilitating charge storage. However, measurement of the space charge distribution in such multilayers is a challenge for conventional methods if layer thickness dimensions shrink below 1 μm. In this paper, we propose an atomic force microscope based method to determine charge distributions in ONO layers with spatial resolution below 100 nm. By applying Kelvin probe force microscopy (KPFM) on freshly cleaved, corona-charged multilayers, the surface potential is measured directly along the z-axis and across the interfaces. This new method gives insights into charge distribution and charge movement in inorganic electrets with a high spatial resolution. KW - electret, multilayer, charge distribution, Kelvin probe force microscopy KW - Kelvin-Sonde KW - Rasterkraftmikroskopie Y1 - 2016 VL - 2016 IS - 27 SP - 1 EP - 10 ER - TY - GEN A1 - Kaps, Rolf Ulrich T1 - Caps : die Career Position Score zur Vergleichbarmachung von Positionen in unterschiedlichen Hierarchien N2 - Angesichts der starken Effekte, die eine von der allgemeinen bzw. vorgeschriebenen Vorgehensweise abweichende Zuordnung der Hierarchiestufen zu den Management-ebenen haben kann, wäre ein Instrument wünschenswert, dass zumindest Indizien für eine solche abweichende Vorgehensweise liefern kann. Im vorliegenden Beitrag werden entsprechende Kennzahlen entworfen und deren Tauglichkeit diskutiert. KW - Betriebliche Kennzahl Y1 - 2016 ER - TY - GEN A1 - Kaps, Rolf Ulrich T1 - Fluktuationskennzahlen und die liebe Mathematik N2 - Der vorliegende Beitrag widmet sich einem in der Literatur wenig diskutiertem Aspekt: der Tauglichkeit verschiedener Berechnungsweisen von Fluktuationskennzahlen, d. h. vor allem unter Betrachtung mathematischer Gesichtspunkte. Dazu werden vier unterschiedliche Berechnungsweisen betrachtet: 1) die Basisformel, 2) die Schlüter-Formel, 3) die ZVEI-Formel und 4) die BDA-Formel. KW - Personalkennzahl Y1 - 2016 ER - TY - JOUR A1 - Jost, Thomas T1 - Fehlentwicklungen: Hausaufgaben für die Schuldnerländer JF - Euro am Sonntag KW - Eurozone, Reformen, Europäischer Währungsfonds KW - Eurozone Y1 - 2017 ER - TY - CHAP A1 - Reuter, Rebecca A1 - Hauser, Florian A1 - Gold-Veerkamp, Carolin A1 - Mottok, Jürgen A1 - Abke, Jörg T1 - Towards a Definition and Identification of Learning Obstacles in Higher Software Engineering Education T2 - EDULEARN17 Proceedings KW - Hochschuldidaktik KW - Software Engineering Y1 - 2017 SN - 978-84-697-3777-4 SN - 2340-1117 SP - 10259 EP - 10267 ER - TY - CHAP A1 - Borgeest, Kai A1 - Höfer, Patrik A1 - Seubert, Michael A1 - Stein, Simon T1 - Model Based EGR Control T2 - Proceedings of the Fev Diesel Powertrains 3.0, July 11th & 12th 2017 N2 - Almost stationary control of the correct EGR rate (Exhaust Gas Recirculation) is state of the art. More aggressive emission tests such as WLTP and RDE require a dynamic control of the EGR rate, otherwise a too low EGR rate results in increased NOx emissions, a too high EGR rate in particulate emissions. The difficulty in any EGR control is the missing plant knowledge; the EGR rate is controlled although the present EGR rate is not exactly known. EGR flow sensors are available, but due to additional costs they have not found a broad acceptance. A different approach for high pressure EGR investigated in this paper is a control using a second lambda sensor between EGR and inlet valves. This approach improves the dynamic response, but it might come with costs similar to an EGR flow sensor. Alternatively a model based approach can be used which shows high potential. KW - Exhaust Gas Recirculation KW - Abgasrückführung Y1 - 2017 SP - 64 EP - 66 PB - FEV CY - Aachen ER - TY - BOOK A1 - Mann, Michael T1 - Der Einfluss veränderlicher Erdbodenparameter auf das Ausbreitungsverhalten elektromagnetischer Felder niederer Frequenzen T1 - The Influence of Varying Soil Parameters on the Propagation of Electromagnetic Waves of Low Frequencies N2 - Im Rahmen der Einführung des weltweiten Digitalrundfunks (Digital Radio Mondiale) im Frequenzbereich der Langwelle, Mittelwelle und Kurzwelle interessiert für Lang- und Mittelwelle der Einfluss veränderlicher Parameter des Erdbodens auf das abgestrahlte Signal. Zur Funknetzplanung werden die im “World Atlas of Ground Conductivities” aufgeführten Bodenleitfähigkeitskarten der International Telecommunication Union (ITU) herangezogen, die jedoch nur einen groben Überblick über die Verhältnisse geben. In dieser Arbeit soll untersucht werden, ob die Karten der Bodenleitfähigkeit in ihrer Ortsauflösung genügend genau dargestellt sind und ob gegebenenfalls durch die Anwendung alternativer Verfahren genauere Karten erstellt werden können. Weiterhin sind unterschiedliche Verfahren zur Messung der Bodenleitfähigkeit bezüglich ihrer Anwendbarkeit zu beurteilen. N2 - With respect to the introduction of the worldwide digital radio broadcast service (DRM) at low and medium frequencies (MF), significant interest has to be paid to the influence of variable parameters of the soil towards the transmitted signal. Network Planners utilize ground conductivity maps provided by the “World Atlas of Ground Conductivities” by the International Telecommunication Union (ITU). The current version of these maps may not grant more than a coarse view on the situation. This contribution shall determine whether ground conductivity maps show sufficient detail or whether maps with more detail may be produced by applying alternative procedures of ground conductivity measurement. Furthermore, the standard procedures of ground conductivity measurement are to be rated with respect to their applicability in the medium frequency range. N2 - Dissertation KW - Bodenleitfähigkeit KW - Boden KW - Elektromagnetische Welle KW - Leitfähigkeit KW - Niederfrequenz KW - DRM (Rundfunktechnik) Y1 - 2006 SN - 978-3-939432-28-9 N1 - Zugl.: Kaiserslautern, Techn. Univ., Diss., 2006 VL - 2006 PB - Lehrstuhl für Hochspannungstechnik und Elektromagnetische Verträglichkeit, Univ. CY - Kaiserslautern ER - TY - BOOK A1 - Borgeest, Kai T1 - Manipulation von Abgaswerten N2 - Dieses kleine Buch stellt Hintergründe zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuergeräte, Abgasrückführung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Prüfstand möglich sind, mit welchen Fahrzyklen getestet wird und in welchem rechtlichen und politischen Umfeld dies lange Zeit unbemerkt mit unterschiedlichen Konsequenzen in der EU und den USA geschehen konnte. Es werden Maßnahmen vorgestellt, mit denen Fahrzeuge auch real gesetzliche Grenzwerte einhalten können und wie Manipulationen zukünftig rechtlich und politisch verhindert werden können. Dem Leser werden durch Literaturhinweise zusätzliche Details erschlossen. KW - Abgasemmission KW - Grenzwert KW - Kraftfahrzeugelektronik KW - Abgase KW - Steuergerät KW - Abgasskandal KW - Abgasrückführung KW - Abschaltfunktion KW - Manipulation KW - Messung KW - Wirtschaftskriminalität Y1 - 2017 SN - 978-3-658-17180-3 PB - Springer-Vieweg CY - Wiesbaden ER - TY - JOUR A1 - Reuter, Carsten A1 - Foerstl, Kai A1 - Hartmann, Evi A1 - Blome, Constantin T1 - Sustainable Global Supplier Management: The Role of Dynamic Capabilities in Achieving Competitive Advantage JF - Journal of Supply Chain Management N2 - Organizations face increased pressure from stakeholders to incorporate a plethora of corporate responsibility (CR) and sustainability aspects in their business practices. Legal and extra-legal demands are dynamically changing; almost no organizational function is unaffected. Owing to the outsourcing wave of the last decade, in particular purchasing and supply management (PSM) plays an ever more important role in assuring sustainable production of the firm’s products offered in the marketplace. The supply base of many Western firms has become increasingly global and spend volumes have shifted towards emerging countries. In order to avoid the risk of reputational damage to the buying company, the PSM department must ensure that their international suppliers comply with their corporate codes of conduct and that environmental and social misconduct at supplier premises does not occur. In this paper, ‘‘sustainability’’ refers to the pursuit of the tripartite of economic, environmental, and social performance.We contribute to prior research in the fields of sustainability and CR by extending insights of the dynamic capabilities view to analyze how the PSM function integrates sustainability aspects in its global supplier management processes. Based on four case studies in the chemical industry, we propose that profound sustainable global supplier management (SGSM) capabilities are a source of competitive advantage. These capabilities are path dependent and particularly valuable when organizations are receptive to external stakeholder pressure. Early movers in the field of SGSM reap competitive benefits to a notable extent as a result of resource accumulation and learning processes over time. KW - Sustainability KW - corporate responsibility KW - Case Research KW - Nachhaltigkeit KW - Corporate Social Responsibility Y1 - 2010 VL - 46 IS - 2 SP - 45 EP - 63 ER - TY - CHAP A1 - Reuter, Carsten T1 - Understanding Directed Sourcing in Triadic Supply Networks N2 - Firms experience that an increasingly complex supply base is a costly investment. In order to keep specialized suppliers but to reduce the effort of managing it, OEMs contract second-tier firms and direct them to first-tier suppliers. We conduct four embedded case studies in the international automotive industry to record types and possible motivations of directed sourcing. Our findings show that directed sourcing triads may be set up to achieve operational efficiencies but also for strategic reasons such as to gain access to foreign markets. This research contributes to literature on triadic supply chains in general and network buyer-supplier relationships specifically. KW - Directed Sourcing KW - Triadic Supply Networks KW - Case Research KW - Beschaffung KW - Supply Chain Management Y1 - 2017 ER - TY - CHAP A1 - Rücker, Michael T. A1 - Pancratz, Nils A1 - Gold-Veerkamp, Carolin A1 - Pinkwart, Niels A1 - Brinda, Torsten ED - Diethelm, Ira T1 - Workshop zu Alltagsvorstellungen in der Informatik: Erhebungsmethodik und Implikationen für den Unterricht T2 - Informatische Bildung zum Verstehen und Gestalten der digitalen Welt N2 - Ein zentrales Konzept jeder konstruktivistisch geprägten Auffassung von Lernen ist, dass das Vorwissen, die Präkonzepte und ggf. Fehlvorstellungen der Lernenden einen direkten Einfluss auf den Lernprozess haben: sowohl negativ als auch positiv. Speziell für die Informatik gilt, dass Lernende heutzutage von Beginn an in einer Welt aufwachsen, die von informatischen Artefakten und Systemen nahezu vollständig durchdrungen ist. Sie beobachten sie, interagieren mit ihnen und formen so Vorstellungen über ihre Funktionsweisen und Eigenschaften. Sie bilden somit bereits im Alltag und vor dem Beginn jeglicher Schulbildung kohärente Konzeptionen über zentrale Gegenstände und Inhalte der Informatik. Im Rahmen dieses Workshops werden zunächst verschiedene methodische Ansätze und erste Ergebnisse zu Erhebungen solcher Lernervorstellungen vorgestellt. Anschließend sollen diese anhand von drei Leitfragen verglichen und diskutiert werden: Welche Stärken und Schwächen haben die jeweils verwendeten empirischen Methoden bei der Erhebung von Lernervorstellungen in der Informatik? Wie können sie sich ggf. sinnvoll ergänzen? Welche Implikationen haben die erhobenen Vorstellungen für die Unterrichtspraxis? KW - Forschungsmethode KW - Konstruktivismus Y1 - 2017 UR - https://dl.gi.de/bitstream/handle/20.500.12116/4340/paper.pdf?sequence=1&isAllowed=y SN - 978-3-88579-668-8 SP - 393 EP - 401 PB - Köllen Druck+Verlag GmbH CY - Bonn ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Kuhn, Martina A1 - Abke, Jörg T1 - Can Pair Programming Address Multidimensional Issues in Higher Education? T2 - International Conference on Interactive Collaborative Learning (ICL) N2 - To handle heterogeneity within students, to foster needed generic competencies, to motivate them, and to increase their employability, a didactical method to teach and learn programming in non-major degree programs shall be found. Therefore, this paper covers strategies and the theoretical underpinning concerning these four challenges and gives solutions how to cope with them. Finally, Pair Programming is presented as a method that addresses the issues introduced here. KW - Extreme programming KW - Teamwork Y1 - 2017 UR - https://opus4.kobv.de/opus4-h-ab/frontdoor/index/index/docId/863 SP - 327 EP - 334 PB - Springer ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Probst, Anne-Catherine A1 - Nentvich, Ondrej A1 - Urban, Martin A1 - Inneman, Adolf A1 - Sieger, Ladislav A1 - Marsikova, Veronika A1 - Döhring, Thorsten T1 - Development of iridium coated silicon X-ray mirrors for Lobster Eye astronomical telescopes T2 - Proceedings of EOSMOS 2017 N2 - In the field of X-ray astronomy different types of telescope optics based on grazing incidence mirrors can be used. This contribution presents a special design of a Lobster Eye wide-field telescope with mirrors based on flat silicon wafers and the task of coating such mirror substrates with reflective iridium layers. KW - X-ray KW - mirror KW - telescope KW - Lobster Eye KW - iridium KW - Iridium KW - Röntgenteleskop Y1 - 2017 VL - 2017 IS - EOSMOS 2017 SP - 1 EP - 2 PB - European Optical Society ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Proserpio, Laura A1 - Friedrich, Peter A1 - Madarasz, Emanuel A1 - Breunig, Elias A1 - Burwitz, Vadim A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine T1 - Indirect glass slumping of grazing incidence mirror segments for lightweight x-ray telescopes T2 - Proceedings of the International Society for Optics and Photonics (SPIE) N2 - The paper provides a description of recent progress in the development of lightweight, precision and highthroughput grazing-incidence mirrors for X-ray astronomy made of glass. In particular, the indirect slumping technology under investigation at the Max Planck Institute for Extraterrestrial Physics (MPE) is reviewed and recent activities are presented together with the research approach. The glass slumping technique foresees several steps: a thermal forming process using a suitable mould; a re ective layer application; the alignment and integration of mirror segments into a supporting structure; and the � nal veri� cation of prototype modules using X-rays. Each step is considered at MPE, with the involvement of partner institutes and universities. The last year of activities was mainly dedicated to the procurement of new moulds and to the application of Iridium coating. The main results will be presented. KW - X-ray KW - iridium KW - telescope KW - slumping KW - glass KW - Iridium KW - Röntgenteleskop Y1 - 2017 U6 - https://doi.org/10.1117/12.2272671 VL - 2017 IS - 10399 SP - 103991Z-1 EP - 103991Z-7 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Emmerich, Florian A1 - Stollenwerk, Manfred A1 - Stehlikova, Veronika A1 - Friedrich, Peter A1 - Damm, Christine T1 - Development of iridium coated X-ray mirrors for astronomical applications T2 - Proceedings of the International Society for Optics and Photonics (SPIE) N2 - Future space-based X-ray observatories need to be very lightweight for launcher mass constraints. Therefore they will use a reduced mirror thickness, which results in the additional requirement of low coating stress to avoid deformation of the initial precisely shaped mirror substrates. Due to their excellent reflection properties iridium coatings are sometimes applied for grazing incidence mirrors in astronomical X-ray telescopes. At Aschaffenburg University of Applied Sciences the coating of thin iridium films by an RF-magnetron sputtering technique is under development. The work is embedded in collaborations with the Max-Planck-Institute for Extraterrestrial Physics in Germany, the Czech Technical University in Prague, the Osservatorio Astronomico di Brera in Italy, the German Leibniz Institute for Solid State and Materials Research in Dresden, and the French Institute Fresnel. Sputtering with different parameters leads to iridium films with different properties. The current work is focused on the microstructure of the iridium coatings to study the influence of the substrate and of the argon gas pressure on the thin film growing process. Correlations between coating density, surface micro-roughness, the crystalline structure of the iridium layers, and the expected reflectivity of the X-ray mirror as well as coating stress effects are presented and discussed. The final goal of the project is to integrate the produced prototype mirrors into an X-ray telescope module. On a longer timescale measurements of the mirror modules optical performance are planned at the X-ray test facility PANTER. KW - X-ray KW - telescope KW - mirror KW - iridium KW - coating KW - Iridium KW - Röntgenteleskop Y1 - 2017 U6 - https://doi.org/10.1117/12.2273988 VL - 2017 IS - 10399 SP - 103991C-1 EP - 103991C-8 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten T1 - Critical discussion on the UV absorption properties of Earth's atmosphere T2 - Proceedings of SPIE N2 - Sun´s ultraviolet radiation is classified into UV-A, UV-B, and UV-C bands. Thereby UV-A passes through Earth´s atmosphere, while UV-B is partially absorbed by ozone. The limitations of the commonly accepted statement, that UV-C is always completely absorbed by Earth´s atmosphere, are discussed critically. Below 200 nm the solar spectrum is strongly absorbed by molecular oxygen. The stratospheric ozone layer has strong absorption between 200 nm and 300 nm. However, the “ozone hole” increases UV-B radiation just below 300 nm and may also open a transmitting atmospheric window for harmful UV-C at the overlap region between oxygen absorption and ozone absorption. KW - ultraviolet KW - UV-C KW - absorption KW - atmosphere KW - ozone hole KW - Ozonloch KW - Ultraviolett KW - Atmosphäre KW - Absorption Y1 - 2017 U6 - https://doi.org/10.1117/12.2271645 VL - 2017 IS - 10453 SP - 104530I-1 EP - 104530I-10 PB - SPIE ER - TY - JOUR A1 - Hudec, Rene A1 - Döhring, Thorsten ED - Slovak Academy of Sciences Astronomical Institute, T1 - JEUMICO: Czech-Bavarian astronomical X-ray optics project JF - Contributions of the Astronomical Observatory Skalnaté Pleso N2 - Within the project JEUMICO, an acronym for Joint European Mirror Competence, the Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague started a collaboration to develop mirrors for X-ray telescopes. Corresponding mirror segments use substrates of at silicon wafers which are coated with thin iridium � lms, as this material is promising high re ectivity in the X-ray range of interest. The sputtering parameters are optimized in the context of the expected re ectivity of the coated X-ray mirrors. In near future measurements of the assembled mirror modules optical performances are planned at an X-ray test facility. KW - JEUMICO KW - astronomy KW - mirror KW - iridium KW - Iridium KW - Spiegelteleskop Y1 - 2017 UR - https://www.ta3.sk/caosp/Eedition/Abstracts/2017/Vol_47/No_2/pp170-177_abstract.html VL - 2017 IS - 47 SP - 170 EP - 177 ER - TY - CHAP A1 - Skala, Petr A1 - Döhring, Thorsten A1 - Hudec, Rene T1 - Colors of the universe – market study on optical filters for professional astronomy T2 - DGaO-Proceedings N2 - For astronomers, filters are essential observational tools and in many cases, it is hard for them to find the best supplier. We present list of filters manufacturers and their capabilities sorted and discussed. KW - filter KW - astronomy KW - market study KW - Marktübersicht KW - Optisches Filter Y1 - 2017 UR - http://www.dgao-proceedings.de/download/118/118_p30.pdf SN - 1614-8436 VL - 2017 IS - 2017 PB - DGaO ER - TY - CHAP A1 - Hudec, Rene A1 - Döhring, Thorsten A1 - Remisova, Katerina T1 - Lobster Eye Optics & Biomimetics T2 - DGaO-Proceedings N2 - We present optic designs based on biomimetic, namely technical applications of animal eyes principles (here: Lobster Eyes) for the special application of wide field X-ray imaging. Thereby we show and discuss some experimental results and correlate them with simulations. Preliminary results of an ongoing study on other strange animal mirror eyes with potential scientific and technical applications are also discussed. Some of them are based on the principle of multilayer multi-mirror active optics arrangements. The Lobster Eye X-ray optics needs special reflective coatings for a better performance, which are currently developed within the Bavarian-Czech cooperation project JEUMICO. KW - Lobster KW - X-ray optic KW - mirror KW - Röntgenastronomie Y1 - 2017 UR - http://www.dgao-proceedings.de/download/118/118_a41.pdf SN - 1614-8436 VL - 2017 IS - 2017 PB - DGaO ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Stehlikova, Veronika A1 - Skala, Petr A1 - Inneman, Adolf A1 - Hudec, Rene T1 - JEUMICO – Bayerisch-tschechische Kooperation zur Entwicklung von Röntgenteleskopen T2 - DGaO-Proceedings N2 - Das Projekt JEUMICO wird vom Projektträger BAYHOST im Rahmen eines Programms für bilaterale wissenschaftliche Projekte zwischen Tschechien und Bayern gefördert. Inhaltlich werden von der Hochschule Aschaffenburg und der Technischen Universität Prag hier gemeinsam Röntgenoptiken für ein geplantes astronomisches Experiment an Bord einer NASA-Höhenrakete entwickelt. KW - Röntgenstrahlung KW - Teleskop KW - Astronomie KW - Spiegel KW - Röntgenstrahlung KW - Spiegelteleskop Y1 - 2017 UR - http://www.dgao-proceedings.de/download/118/118_p4.pdf SN - 1614-8436 VL - 2017 IS - 2017 PB - DGaO ER - TY - CHAP A1 - Probst, Anne-Catherine A1 - Döhring, Thorsten A1 - Zeising, Sebastian A1 - Salmaso, Bianca A1 - Stollenwerk, Manfred A1 - Proserpio, Laura T1 - Challenges in metrology of mirror segments for X-ray telescopes T2 - Proceedings of the 8th High Level Expert Meeting Asphere Metrology N2 - High angular resolution, large collecting area and reduced weight per unit area are required for astronomical X-ray telescopes of the next generation observatories. New technologies for processing X-ray mirrors are under development to fulfill these needs. One option is to realize a Wolter I type telescope constituted of several hundred nested thin and light-weight X-ray mirror segments. The individual mirror segments need to be coated with an about 100 nm thick film of a high-reflective material to enhance the reflectivity for X-rays. Thereby an accurate shape metrology of the segments is necessary to predict the angular resolution of the astronomical telescope as well as to control the development process of X-ray mirrors. We present the challenges in shape measurements of thin glasses used to control the coating process and first experimental results about the repeatability of the measurements. KW - metrology KW - mirror KW - telescope KW - Spiegelteleskop Y1 - 2017 UR - http://www.upob.de/index.php?option=com_phocadownload&view=category&download=198:8th-high-level-expert-meeting-2017-detailed-programme&id=21:upob-high-level-expert-meetings&Itemid=70 VL - 2017 IS - 8 PB - UTOB e.V. CY - Braunschweig ER - TY - PAT A1 - Speit, Burkard A1 - Wolff, Silke A1 - Döhring, Thorsten T1 - LEAD-CONTAINING RADIATION RESISTANT GLASS AND MANUFACTURING THE SAME N2 - PROBLEM TO BE SOLVED: To provide a radiation resistant glass having radiation resistance and high transparency.SOLUTION: There is provided a radiation resistant glass containing, by wt.%, the following components: SiO of 12 to 45, BO of 0 to 4, AlO of 0 to 4, TiO of 0 to 5, PbO of 50 to 82, NaO of 0 to 4, KO of 0 to 8, and at least 3 doping agents selected from a group consisting of CeO, MoO, BiO, WO, AgO, SnO, SbO and AsO where the total of these doping agents are at least at 0.1 wt.% and the weight percentage of AsO is 0 to <0.2%. KW - Glas KW - glass KW - space KW - radiation resistant Y1 - 2017 UR - https://worldwide.espacenet.com/publicationDetails/biblio?CC=JP&NR=6081532B2&KC=B2&FT=D&ND=4&date=20170215&DB=EPODOC&locale=en_EP# ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Urban, Martin A1 - Nentvich, Ondrej A1 - Inneman, Adolf A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine ED - Hudec, Rene T1 - Study of lobster eye optics with iridium coated X-ray mirrors for a rocket experiment T2 - Proceedings of the International Society for Optics and Photonics (SPIE) N2 - In the field of astronomical X-ray telescopes, different types of optics based on grazing incidence mirrors can be used. This contribution describes the special design of a lobster-eye optics in Schmidt's arrangement, which uses dual reflection to increase the collecting area. The individual mirrors of this wide-field telescope are made of at silicon wafers coated with reflecting iridium layers. This iridium coatings have some advantages compared to more common gold layers as is shown in corresponding simulations. The iridium coating process for the X-ray mirrors was developed within a cooperation of the Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague. Different mirror parameters essential for a proper function of the X-ray optics, like the surface microroughness and the problematic of a good adhesion quality of the coatings were studied. After integration of the individual mirrors into the final lobster-eye optics and the corresponding space qualification testing it is planned to fly the telescope in a recently proposed NASA rocket experiment. KW - Lobster Eye KW - Iridium KW - mirror KW - coating KW - Iridium KW - Spiegelteleskop KW - optische Schicht Y1 - 2017 U6 - https://doi.org/10.1117/12.2265769 VL - 2017 IS - 10235 SP - 1023505-1 EP - 1023505-7 PB - SPIE International Society for Optics and Photonics CY - Bellingham WA ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Stollenwerk, Manfred A1 - Emmerich, Florian A1 - Stehlíková, Veronika A1 - Inneman, Adolf ED - Hudec, René ED - Pina, Ladislav T1 - Prototyping iridium coated mirrors for X-ray astronomy T2 - Proceedings of the International Society for Optics and Photonics N2 - X-ray astronomy uses space-based telescopes to overcome the disturbing absorption of the Earth´s atmosphere. The telescope mirrors are operating at grazing incidence angles and are coated with thin metal films of high-Z materials to get sufficient reflectivity for the high-energy radiation to be observed. In addition the optical payload needs to be light-weighted for launcher mass constrains. Within the project JEUMICO, an acronym for “Joint European Mirror Competence”, the Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague started a collaboration to develop mirrors for X-ray telescopes. The X-ray telescopes currently developed within this Bavarian- Czech project are of Lobster eye type optical design. Corresponding mirror segments use substrates of flat silicon wafers which are coated with thin iridium films, as this material is promising high reflectivity in the X-ray range of interest. The deposition of the iridium films is based on a magnetron sputtering process. Sputtering with different parameters, especially by variation of the argon gas pressure, leads to iridium films with different properties. In addition to investigations of the uncoated mirror substrates the achieved surface roughness has been studied. Occasional delamination of the iridium films due to high stress levels is prevented by chromium sublayers. Thereby the sputtering parameters are optimized in the context of the expected reflectivity of the coated X-ray mirrors. In near future measurements of the assembled mirror modules optical performances are planned at an X-ray test facility. KW - X-ray KW - iridium KW - mirror KW - lightweight optic KW - Lobster Eye KW - Iridium KW - Röntgenastronomie KW - Spiegelteleskop Y1 - 2017 U6 - https://doi.org/10.1117/12.2265931 VL - 2017 IS - 10235 SP - 1023504-1 EP - 1023504-8 PB - SPIE International Society for Optics and Photonics CY - Bellingham WA ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Diethelm, Ira T1 - What About Misconceptions in Software Engineering? T2 - Global Engineering Education Conference (EDUCON) N2 - In Software Engineering education didactical foundation is still at its beginnings. In recent years, this topic is put into stronger focus, as Software Engineering becomes more and more important in our everyday life. However, it is hard to teach and learn, because of diverse factors, e.g. the immateriality of the product. Therefore it is significant to improve the learning process on the one hand and to minimise obstacles to learning on the other hand. Other disciplines – with a long historical background in their ”Fachdidaktik” (e.g., biology or chemistry) – have already dealt with one sort of learning barriers; so-called misconceptions. The hurdle that misconceptions create can and will be explained by the constructivist learning theory. This paper covers a research approach to identify, analyse, filter and Cluster misconceptions in Software Engineering. KW - Software Engineering Y1 - 2017 SN - 978-1-5090-5466-4 SP - 704 EP - 708 PB - IEEE ER - TY - CHAP A1 - Rodriguez Perez, Simón A1 - Fatoum, Ahmad A1 - Abke, Jörg ED - Lucke, Ulrike T1 - Toolchain zur ANSI-C Programmierung des Lego Mindstorms EV3 in der Hochschullehre T2 - Die 14. E-Learning Fachtagung Informatik KW - LEGO MindStorms KW - ANSI C Y1 - 2016 SN - 978-3-88579-656-5 SP - 323 EP - 325 PB - Gesellschaft für Informatik CY - Bonn ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Kälberer, Nina A1 - Kuhn, Martina A1 - Abke, Jörg ED - Meiselwitz, Gabriele T1 - A Validated Educational Format in Software Engineering Targeting Students’ Collaboration Skills T2 - Social Computing and Social Media - 8th International Conference, SCSM 2016, Held as Part of HCI International 2016 N2 - In the context of the Bologna process the “shift from teaching to learning” is postulated to meet two central goals: To increase the students’ employability and to foster needed competencies. To be in a position to process methods and find solutions for highly complex, abstract, large, and multilayered problems, a Software Engineer has to have a lot of subject knowledge and technical competencies; but above all, he/she has to be able to work in – at least one – team. For the purpose of preparing the students with professional know-how and moreover with teamwork skills, the approach shown in this paper supplements an ex-cathedra teaching by a seminar and a project phase. This combination is dedicated to acquire theoretical knowledge in a collaborative and self-directed way. This is done in order to be able to deepen the learned matter, to share content through learning-by-teaching in groups and furthermore to apply the knowledge and skills in a simulated project, which constitutes a realistic situation and teamwork of an engineer as good as possible. KW - Software Engineering KW - Lehre Y1 - 2016 SN - 978-3-319-39910-2 U6 - https://doi.org/10.1007/978-3-319-39910-2_31 SP - 335 EP - 346 PB - Springer CY - Cham ER - TY - CHAP A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Diethelm, Ira T1 - Research Approach to Analyse and Foster Discipline-Specific Language Competency in Software Engineering Education T2 - Global Engineering Education Conference (EDUCON) N2 - Language - spoken and written - is the medium for information and knowledge sharing; and it is almost always even a role of every subject in (higher) education. The language therefore plays an important part in teaching and learning. This is further underlined by the fact that "discipline-specific language" - which is "the uses of language in university discipline learning and teaching and in professional life in a particular discipline" - can be understood as a link between knowledge and generic/personal/interpersonal competencies; especially communication skills. In this paper a research proposal is outlined to enable an enhanced and conscious approach to the use of language and special terms in Software Engineering in higher education. This is done by a two-piece approach that considers terminology from a linguistic and a didactical point of view. All of this combined is intended to contribute toward the development of a terminology in Software Engineering and, in a wider context, to reach the top goal of this research agenda: To be able to obtain recommendations for action for teaching and learning methods to improve the quality and sustainability of teaching and learning in this discipline. KW - Lehre KW - Software Engineering KW - Terminologie Y1 - 2016 SN - 978-1-4673-8633-3 U6 - https://doi.org/10.1109/EDUCON.2016.7474619 SP - 652 EP - 659 PB - IEEE ER - TY - CHAP A1 - Rodriguez Perez, Simón A1 - Fatoum, Ahmad A1 - Abke, Jörg ED - IEEE, T1 - Development of an Eclipse Plugin for Using the LEGO Mindstorms EV3 in Education T2 - Global Engineering Education Conference (EDUCON) N2 - LEGO's new robot, the Mindstorms EV3, offers a range of new possibilities for education. Its most important innovation is building upon the Linux kernel for the programmable unit. LEGO has also open sourced the firmware, allowing an easy extension. Programming for a robot can give engineering students much more practical experience with technical problems and improve the learning motivation. This was the reason to include the EV3 at the university's computer science course in the studies for Mechatronics, which utilises ANSI C as the programming language. As there was - until now - no possibility to program the robot in ANSI C, an Application Programming Interface, an Eclipse plug-in and an uploader were developed. Main criteria was an easy handling of these tools. In this paper the plug-in and its integration into the computer science course is presented. KW - LEGO MindStorms KW - Lehre Y1 - 2016 SN - 978-1-4673-8633-3 U6 - https://doi.org/10.1109/EDUCON.2016.7474616 SP - 631 EP - 636 PB - IEEE ER - TY - JOUR A1 - Kröhn, Michael A1 - Eifert, Erik A1 - Reuter, Norbert A1 - Hahnle, Michael A1 - Prochus, Tobias A1 - Doll, Konrad ED - Albers, Thomas ED - Kegel, Gunther ED - Oprzynski, Jörn ED - Otten, Wilhelm ED - Steckenreiter, Thomas T1 - Gestenbasierte Prozessanalyse JF - atp edition N2 - Dieser Beitrag beschreibt ein intelligentes Assistenzsystem, das manuelle Montageprozesse beobachten und Auffälligkeiten im Ablauf identifizieren kann. Die mit der Montage verbundenen Handgriffe werden als eine Abfolge von Gesten erfasst. Aus den Zeitabständen zwischen den Handgriffen lassen sich statistische Aussagen gewinnen. So kann beispielsweise eine große Streuung auf Qualitäts- oder Konzeptprobleme hinweisen. Den Kern des Assistenzsystems bildet die Kinect von Microsoft. Die Autoren stellen das Konzept und erste Ergebnisse des Verfahrens vor. Y1 - 2017 VL - 2016 IS - 12 SP - 26 EP - 33 ER - TY - CHAP A1 - Bieshaar, Maarten A1 - Reitberger, Günther A1 - Zernetsch, Stefan A1 - Sick, Bernhard A1 - Fuchs, Erich A1 - Doll, Konrad T1 - Detecting intentions of vulnerable road users based on collective intelligence T2 - AAET – Automatisiertes und vernetztes Fahren N2 - Vulnerable road users (VRUs, i.e. cyclists and pedestrians) will play an important role in future traffic. To avoid accidents and achieve a highly efficient traffic flow, it is important to detect VRUs and to predict their intentions. In this article a holistic approach for detecting intentions of VRUs by cooperative methods is presented. The intention detection consists of basic movement primitive prediction, e.g. standing, moving, turning, and a forecast of the future trajectory. Vehicles equipped with sensors, data processing systems and communication abilities, referred to as intelligent vehicles, acquire and maintain a local model of their surrounding traffic environment, e.g. crossing cyclists. Heterogeneous, open sets of agents (cooperating and interacting vehicles, infrastructure, e.g. cameras and laser scanners, and VRUs equipped with smart devices and body-worn sensors) exchange information forming a multi-modal sensor system with the goal to reliably and robustly detect VRUs and their intentions under consideration of real time requirements and uncertainties. The resulting model allows to extend the perceptual horizon of the individual agent beyond their own sensory capabilities, enabling a longer forecast horizon. Concealments, implausibilities and inconsistencies are resolved by the collective intelligence of cooperating agents. Novel techniques of signal processing and modelling in combination with analytical and learning based approaches of pattern and activity recognition are used for detection, as well as intention prediction of VRUs. Cooperation, by means of probabilistic sensor and knowledge fusion, takes place on the level of perception and intention recognition. Based on the requirements of the cooperative approach for the communication a new strategy for an ad hoc network is proposed. The evaluation is done using real data gathered with a research vehicle, a research intersection with public traffic and mobile devices. KW - Verkehrsverhalten Y1 - 2017 SP - 67 EP - 87 ER - TY - JOUR A1 - Elsebach, Jens A1 - Lay, Andreas A1 - Scharpenberg, Tobias T1 - Berührungslos 3D erfassen JF - Technische Kommunikation N2 - Interaktive 3D-Objekte machen Informationsprodukte interessant, nachvollziehbar und spannend. Die 3D-Medienproduktionskette auf Grundlage von zur Verfügung stehenden 3D-CAD-Konstruktionsdaten ist sehr weit entwickelt. Photorealistische Animationen können mit wenig zusätzlichem Aufwand aus den CAD-Daten produziert und in verschiedene Informationsprodukte der Technischen Redaktion integriert werden. In der Praxis ist die Bereitstellung von hierfür geeigneten 3D-Daten jedoch nicht immer so einfach. Im Artikel wird der Einsatz von mobilen Laserscannern zur Erstellung von geeigneten 3D Modellen erklärt. KW - Laserscanning KW - Mobiles Laserscanning KW - 3D Informationsentwicklung KW - Virtual Reality KW - 3D Modelle KW - Laserscanner Y1 - 2016 VL - 2016 IS - 05 / 2016 SP - 48 EP - 53 ER - TY - JOUR A1 - Elsebach, Jens T1 - Ein Handbuch für jeden. JF - Technische Kommunikation N2 - Mobile Zugriffsmöglichkeiten und Informationsdarstellungen, die sich an den Wünschen der Nutzer orientieren, lassen auch die Ansprüche im Bauwesen steigen. Damit die Baudokumentation mit diesen Entwicklungen Schritt halten kann, ist die Einführung bereits etablierter Ansätze aus anderen Bereichen, zum Beispiel der Technischen Kommunikation, notwendig. Informationen müssen modularisiert und unabhängig vom Layout vorgehalten werden. Erforderlich ist dazu eine Umstellung der Sichtweise aller Beteiligten – von der Sicht auf Dokumente hin zur Sicht auf Informationsbausteine. Wenn die Informationen modularisiert vorliegen, können sie für verschiedene Medien publiziert und kontextsensitiv einer breiten Nutzerschicht zur Verfügung gestellt werden. KW - Baudokumentation KW - Technische Dokumentation KW - Informationsmanagement im Bauwesen KW - Wissensmanagement im Bauwesen KW - Dokumentation KW - Gebäude Y1 - 2014 VL - 2014 IS - 05 / 2014 SP - 54 EP - 57 ER - TY - JOUR A1 - Elsebach, Jens T1 - Vom Bauplan zum Handbuch JF - Technische Kommunikation N2 - Die Bedeutung der Dokumentation für einen nachhaltigen und wirtschaftlichen Gebäudebetrieb bestreitet kaum ein Architekt, Planer, Bauherr oder Generalunternehmer. Die eigentliche Dokumentationsleistung wird in der Praxis jedoch oft unterschätzt. Mit dem Start des Projekts sollte die Dokumentation ganzheitlich angegangen und vertraglich vereinbart werden. Im Artikel wird beschrieben, wie insbesondere der Übergang von der Bau- in die Nutzungsdokumentation gestaltet werden muss. KW - Technische Dokumentation KW - Baudokumentation KW - Nutzungsdokumentation KW - Wissensmanagement im Bauwesen KW - Informationsmanagement im Bauwesen KW - Dokumentation KW - Gebäude Y1 - 2014 VL - 2014 IS - 04 / 2014 SP - 48 EP - 51 ER - TY - JOUR A1 - Elsebach, Jens T1 - Bauwerke dokumentieren JF - Technische Kommunikation N2 - Moderne Gebäude stecken voller Technik,die ohne sorgfältige Dokumentation schnell Schaden nehmen kann.Während der Bauzeit treffen Bauherren, Generalunternehmer, Planer und Handwerker aufeinander, jede Gruppe mit eigenen Anforderungen an die Dokumentation. Im Artikel werden die verschiedenen Perspektiven und Dokumentationsinteressen beleuchtet und die Informations- und Dokumentationsaufgaben rund um die Erstellung von Gebäuden erläutert. KW - Technische Dokumentation KW - Gebäudedokumentation KW - Baudokumentation KW - Wissensmanagement KW - Informationsmanagement KW - Dokumentation KW - Gebäude Y1 - 2014 VL - 2014 IS - 02/2014 SP - 48 EP - 51 ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Kohnen, Sascha A1 - Goldhammer, Michael A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Trajectory prediction of cyclists using a physical model and an artificial neural network T2 - Intelligent Vehicles Symposium (IV), 2016 N2 - This article presents two methods for predicting the trajectories of cyclists at an intersection and compares them to a Kalman Filter (KF) approach. The first method uses a physical model of cyclists to predict their future position. The second method is based on a polynomial least-squares approximation in combination with a multilayer perceptron artificial neural network and is able to predict the future position of cyclists independent of their motion type such as “Starting”, “Stopping”, “Waiting” or “Passing”. To evaluate the performance of the methods, 566 tracks (394 for training, 172 for testing) of uninstructed cyclists were recorded at a public intersection using a wide angle stereo camera system and laser scanners. Using the tracks as input data, the future trajectory was predicted for a time horizon of 2.5 s. For starting motions the prediction using the physical model leads to 27% more accurate positions than the KF approach for a forecast horizon of 2.5 s. The neural network shows a 34% more accurate result for starting and stopping motions and a similar result for waiting and passing motions. KW - Kalman-Filter KW - Prognose Y1 - 2016 U6 - https://doi.org/10.1109/IVS.2016.7535484 SP - 833 EP - 838 ER - TY - JOUR A1 - Lieb, Florian A1 - Stark, Hans-Georg A1 - Thielemann, Christiane T1 - A stationary wavelet transform and a time-frequency based spike detection algorithm for extracellular recorded data JF - Journal of Neural Engineering N2 - Objective. Spike detection from extracellular recordings is a crucial preprocessing step when analyzing neuronal activity. The decision whether a specific part of the signal is a spike or not is important for any kind of other subsequent preprocessing steps, like spike sorting or burst detection in order to reduce the classification of erroneously identified spikes. Many spike detection algorithms have already been suggested, all working reasonably well whenever the signal-to-noise ratio is large enough. When the noise level is high, however, these algorithms have a poor performance. Approach. In this paper we present two new spike detection algorithms. The first is based on a stationary wavelet energy operator and the second is based on the time-frequency representation of spikes. Both algorithms are more reliable than all of the most commonly used methods. Main results. The performance of the algorithms is confirmed by using simulated data, resembling original data recorded from cortical neurons with multielectrode arrays. In order to demonstrate that the performance of the algorithms is not restricted to only one specific set of data, we also verify the performance using a simulated publicly available data set. We show that both proposed algorithms have the best performance under all tested methods, regardless of the signal-to-noise ratio in both data sets. Significance. This contribution will redound to the benefit of electrophysiological investigations of human cells. Especially the spatial and temporal analysis of neural network communications is improved by using the proposed spike detection algorithms. KW - spike detection KW - wavelet TEO KW - extracellular recording KW - Neuronales Netz Y1 - 2017 U6 - https://doi.org/10.1088/1741-2552/aa654b VL - 2017 IS - 14 SP - 1 EP - 13 ER - TY - JOUR A1 - Jost, Thomas A1 - Reitz, Stefan T1 - 25 Jahre Maastrichter Verträge - reale Divergenzen und institutionelle Reformen JF - Wirtschaftsdienst - Zeitschrift für Wirtschaftspolitik KW - Maastricht, Eurozone, Euro, Konvergenz KW - Maastrichter Vertrag Y1 - 2017 VL - 97 IS - 2 SP - 124 EP - 129 PB - Springer ER - TY - BOOK A1 - Jost, Thomas T1 - Zur internationalen Transmission makropolitischer Aktivitäten bei flexiblen Wechselkurse KW - Flexible Wechselkurse KW - Koordinierte Wirtschaftspolitik KW - Flexibler Wechselkurs KW - Internationaler Konjunkturzusammenhang KW - Transmissionsmechanismus KW - Ökonometrisches Modell Y1 - 1989 PB - Peter Lang Verlag CY - Frankfurt am Main ER - TY - RPRT A1 - Jost, Thomas T1 - Direct Investment and Germany as a Business Location T2 - Deutsche Bundesbank, Discussion Paper KW - Direktinvestitionen KW - Standortdiskussion KW - Direktinvestition Y1 - 1997 IS - 2/97 ER - TY - CHAP A1 - Jost, Thomas T1 - Zur Aussagekraft der Direktinvestitionsstatistiken der Deutschen Bundesbank T2 - Theorie und Empirie der Direktinvestitionen KW - Direktinvestitionen KW - Deutsche Bundesbank KW - Direktinvestition Y1 - 1999 SN - 9783428100156 VL - 1999 IS - N.F. 65 SP - 129 EP - 148 PB - Schriftenreihe des Rheinisch-Westfälischen Instituts für Wirtschaftsforschung CY - Essen ER - TY - JOUR A1 - Jost, Thomas T1 - Wettbewerbsvorteile deutscher Unternehmen in Mittel- und Osteuropa JF - Das wirtschaftswissenschaftliche Studium (WiSt) KW - Außenhandel KW - Wettbewerbsvorteile KW - Außenhandel KW - Wettbewerbsvorteil Y1 - 2001 U6 - https://doi.org/10.15358/0340-1650-2001-1-23 VL - 2001 IS - Januar SP - 23 EP - 29 ER - TY - JOUR A1 - Jost, Thomas T1 - Konzepte zur Bereinigung des Inlands- oder Sozialprodukts um Terms of Trade-Effekte JF - Das Wirtschaftsstudium (WISU) KW - Terms of Trade KW - Bruttoinlandsprodukt KW - Bruttoinlandsprodukt KW - Terms of Trade Y1 - 2001 VL - 2001 IS - April SP - 482 EP - 488 ER - TY - JOUR A1 - Jost, Thomas T1 - Direktinvestitionen - warum und in welchem Umgang deutsche Unternehmen in den EU-Beitrittsländern investieren JF - Das Wirtschaftsstudium (WISU) KW - Direktinvestitionen KW - Direktinvestition Y1 - 2001 VL - 2001 IS - Juli SP - 963 EP - 964 ER - TY - JOUR A1 - Jost, Thomas T1 - Erklärung der regionalen Struktur der deutschen Exporte JF - Review of Economics KW - Aussenhandel KW - Exporte KW - Gravity Modell KW - Außenhandel KW - Export KW - Gravitationsmodell Y1 - 2001 VL - 2001 IS - Band 52 SP - 95 EP - 109 ER - TY - JOUR A1 - Jost, Thomas T1 - Tobin-Steuer - Unwirksam und ökonomisch schädlich JF - Das Wirtschaftsstudium (WISU) KW - Tobin-Tax KW - Kapitalverkehr KW - Tobin-Steuer KW - Kapitalverkehr Y1 - 2001 VL - 2001 IS - Dezember SP - 1629 EP - 1631 ER - TY - RPRT A1 - Jost, Thomas A1 - Nunnenkamp, Peter T1 - Bestimmungsgründe deutscher Direktinvestitionen in Entwicklungs- und Reformländern - Hat sich wirklich etwas verändert? T2 - Kieler Arbeitspapier KW - Direktinvestitionen KW - Entwicklungsländer KW - Direktinvestition Y1 - 2002 UR - https://www.econstor.eu/bitstream/10419/2819/1/kap1124.pdf VL - 2002 IS - 1124 ER - TY - JOUR A1 - Jost, Thomas A1 - Nunnenkamp, Peter ED - Institut für Weltwirtschaft, T1 - Deutsche Direktinvestitionen in Entwicklungs- und Reformländern: Haben sich die Motive gewandelt? JF - Die Weltwirtschaft KW - Direktinvestitionen KW - Entwicklungsländer KW - Direktinvestition Y1 - 2003 VL - 2003 IS - Heft 1 SP - 107 EP - 130 ER - TY - CHAP A1 - Jost, Thomas T1 - Auswirkungen von Direktinvestitionen in Entwicklungsländern T2 - Theoretische und wirtschaftspolitische Aspekte der internationalen Integration KW - Direktinvestitionen KW - Entwicklungsländer KW - Direktinvestition Y1 - 2003 SN - 3-428-11078-1 SP - 255 EP - 273 PB - Duncker & Humblot CY - Berlin ER - TY - CHAP A1 - Jost, Thomas A1 - Rottmann, Horst T1 - Direktinvestitionen - warum und in welchem Umgang deutsche Unternehmen in den EU-Beitrittsländern investieren T2 - So kommen Sie in die Beitrittsländer, Der Wegweiser für den Mittelstand KW - Direktinvestitionen KW - EU-Beitrittsländer KW - Direktinvestition Y1 - 2004 SN - 978-3937385013 SP - 150 EP - 163 PB - Prime-Verlag CY - München ER - TY - JOUR A1 - Jost, Thomas A1 - Rottmann, Horst T1 - Umfang und Motive deutscher Direktinvestitionen in den Industrieländern JF - LIST-Forum für Wirtschafts- und Finanzpolitik KW - Direktinvestitionen KW - Direktinvestition Y1 - 2004 VL - 30 IS - 2 SP - 153 EP - 166 ER - TY - JOUR A1 - Jost, Thomas A1 - Rottmann, Horst T1 - Wäre ein Ausstieg Deutschlands aus der Europäischen Währungsunion sinnvoll? JF - Wirtschaftswissenschaftliches Studium (WiSt) KW - Währungsunion KW - Währungsunion Y1 - 2006 U6 - https://doi.org/10.15358/0340-1650-2006-6-335 VL - 2006 IS - 6 SP - 335 EP - 338 PB - Beck-Verlag ER - TY - JOUR A1 - Jost, Thomas T1 - Sovereign Wealth Funds JF - Das Wirtschaftsstudium (WISU) KW - Staatsfonds KW - Direktinvestitionen KW - Direktinvestition KW - Staatsfonds Y1 - 2008 VL - 2008 IS - August/September SP - 1129 EP - 1129 ER - TY - RPRT A1 - Jost, Thomas T1 - Sovereign Wealth Funds - Size, Economic Effects and Policy Reactions T2 - Weidener Diskussionspapiere KW - sovereign wealth funds KW - FDI KW - Direktinvestition Y1 - 2009 ER - TY - JOUR A1 - Jost, Thomas T1 - Staatsfonds JF - Das Wirtschaftsstudium (WISU) KW - Staatsfonds Y1 - 2009 VL - 2009 IS - Mai SP - 668 EP - 671 ER - TY - JOUR A1 - Jost, Thomas T1 - Die Logik bilateraler Investitionsabkommen JF - Frankfurter Allgemeine Zeitung KW - Direktinvestitionen KW - Investitionsabkommen KW - Direktinvestition Y1 - 2009 VL - 2009 IS - 266 SP - 12 EP - 12 ER - TY - JOUR A1 - Jost, Thomas A1 - Hirdina, Ralph ED - Vale Columbia Center on Sustainable International Investment, T1 - German outward FDI and its policy context JF - Columbia FDI Profiles KW - Direktinvestition Y1 - 2010 VL - 2010 IS - April SP - 1 EP - 14 ER - TY - JOUR A1 - Jost, Thomas T1 - Inward FDI in Germany and its policy context JF - Columbia FDI Profiles KW - FDI KW - FDI policy KW - Direktinvestition Y1 - 2010 VL - 2010 IS - July SP - 1 EP - 13 ER - TY - JOUR A1 - Jost, Thomas A1 - Hirdina, Ralph T1 - German investment in the Baltic states JF - Baltic Rim Economies KW - FDI KW - Baltic economies KW - Direktinvestition KW - Baltikum Y1 - 2010 UR - https://www.utu.fi/sites/default/files/media/drupal/BRE_2010_4.pdf VL - 2010 IS - 4 SP - 35 EP - 35 ER - TY - BOOK A1 - Sauvant, Karl P. A1 - Jost, Thomas A1 - Poveda Garcés, Ana-María A1 - Davies, Ken T1 - Inward and outward FDI country profiles KW - FDI KW - FDI Policy KW - Direktinvestition Y1 - 2011 CY - New York ER - TY - CHAP A1 - Jost, Thomas ED - Michler, Albrecht F. ED - Smeets, Heinz-Dieter T1 - Internationale Kapitalströme vor dem Hintergrund der Finanzkrise, Kommentar T2 - Die aktuelle Finanzkrise: Bestandsaufnahme und Lehren für die Zukunft KW - Kapitalverkehr KW - Finanzkrise KW - Finanzkrise KW - Kapitalverkehr Y1 - 2011 VL - 2011 IS - 93 SP - 353 EP - 355 PB - Lucius&Lucius CY - Stuttgart ER - TY - JOUR A1 - Jost, Thomas T1 - German outward FDI and its policy context, update 2011 JF - Columbia FDI Profiles KW - Direktinvestition Y1 - 2011 VL - 2011 IS - September SP - 1 EP - 14 ER - TY - JOUR A1 - Jost, Thomas T1 - Inward FDI in Germany and its policy context, update 2011 JF - Columbia FDI Profiles KW - Direktinvestition Y1 - 2011 VL - 2011 IS - December/2011 SP - 1 EP - 13 ER - TY - RPRT A1 - Jost, Thomas A1 - Seitz, Franz T1 - The Role of the IMF in the European debt crisis T2 - Weidener Diskussionspapiere KW - IMF KW - Euro crisis KW - Währungskrise KW - International Monetary Fund Y1 - 2012 IS - 32 ER - TY - JOUR A1 - Jost, Thomas T1 - German outward FDI and its policy context, update 2012 JF - Columbia FDI Profiles KW - FDI KW - Direktinvestition Y1 - 2012 VL - 2012 IS - November SP - 1 EP - 12 ER - TY - JOUR A1 - Jost, Thomas T1 - Kein Spielfeld für Interventionismus JF - Börsenzeitung KW - Leistungsbilanz KW - Leistungsbilanz Y1 - 2014 UR - https://www.wiso-net.de/document/BOEZ__2014056036 IS - Nr. 56, 21. März 2014 ER - TY - JOUR A1 - Jost, Thomas A1 - Hirdina, Ralph T1 - Eurozone in der Krise: Utopie und nackte Wirklichkeit JF - Euro am Sonntag KW - Eurokrise KW - EZB Y1 - 2015 UR - http://www.finanzen.net/nachricht/private-finanzen/Euro-am-Sonntag-Eurozone-in-der-Krise-Utopie-und-nackte-Wirklichkeit-4660266 IS - 19. Dezember 2015 ER - TY - JOUR A1 - Jost, Thomas T1 - Much ado about nothing? State controlled entitities and the change in German investment law JF - Columbia FDI Perspectives KW - FDI KW - Sovereign Wealth Funds KW - Direktinvestition KW - Staatsfonds Y1 - 2012 VL - 2012 IS - 71 SP - 1 EP - 3 ER - TY - CHAP A1 - Jost, Thomas ED - Sauvant, Karl P. ED - Sachs, Lisa ED - Schmit Jongbloed, Wouter P.F. T1 - Sovereign Wealth Funds and the German Policy Reaction T2 - Sovereign Investment: Concerns and Policy Reactions KW - FDI KW - Sovereign Wealth Funds KW - Ausländische Direktinvestition KW - Staatsfonds Y1 - 2012 SN - 978-0-19-993792-9 U6 - https://doi.org/10.1093/acprof:osobl/9780199937929.001.0001 SP - 453 EP - 462 PB - Oxford University Press CY - New York ER - TY - JOUR A1 - Jost, Thomas T1 - Inward FDI in Germany and its Policy Context, 2012 JF - Columbia FDI Profiles KW - FDI KW - Direktinvestition Y1 - 2013 VL - 2013 IS - April 6, 2013 SP - 1 EP - 12 ER - TY - CHAP A1 - Jost, Thomas A1 - Seitz, Franz ED - Wentzel, Dirk T1 - Zur Rolle des IWF in der europäischen Schuldenkrise T2 - Internationale Organisationen: ordnungspolitische Grundlagen, Perspektiven und Anwendungsbereiche KW - Internationaler Währungsfonds KW - Eurokrise KW - Eurozone KW - Währungskrise KW - Internationaler Währungsfonds Y1 - 2013 SN - 9783110508741 U6 - https://doi.org/10.1515/9783110508741-006 VL - 2013 IS - 97 SP - 103 EP - 129 PB - Lucius&Lucius CY - Stuttgart ER - TY - RPRT A1 - Jost, Thomas T1 - Let's blame Germany for its current account surplus!? T2 - Weidener Diskussionsbeiträge, Diskussionspapier Nr. 39, Mai 2014 KW - Current Account Balance KW - Leistungsbilanz Y1 - 2014 ER - TY - JOUR A1 - Jost, Thomas A1 - Seitz, Franz T1 - EZB muss nationale Geldpolitik in Athen stoppen JF - Börsenzeitung KW - Geldpolitik, EZB, ELA KW - Geldpolitik KW - Europäische Zentralbank Y1 - 2015 UR - https://www.wiso-net.de/document/BOEZ__2015028037 IS - Ausgabe 28, 11. Februar 2015 SP - 7 EP - 7 ER - TY - JOUR A1 - Jost, Thomas A1 - Seitz, Franz T1 - Die Selbstüberschätzung der EZB JF - Euro am Sonntag KW - Geldpolitik, EZB, Quantitative Easing KW - Geldpolitik KW - Europäische Zentralbank Y1 - 2015 UR - https://www.wiso-net.de/document/EUSO__131707594 VL - 2015 IS - 6 SP - 61 EP - 61 ER - TY - JOUR A1 - Jost, Thomas A1 - Seitz, Franz T1 - Düstere Aussichten für deutsche Sparer JF - AnlegerPlus KW - Ersparnisbildung KW - Sparen Y1 - 2016 VL - 2016 IS - 3 SP - 70 EP - 70 ER - TY - JOUR A1 - Jost, Thomas A1 - Seitz, Franz T1 - Ist Sparen ökonomisch noch zeitgemäß? JF - Börsenzeitung KW - Ersparnis KW - Sparen Y1 - 2015 UR - https://www.wiso-net.de/document/BOEZ__2015204032 IS - Ausgabe 204/2015 SP - 7 EP - 7 ER - TY - JOUR A1 - Jost, Thomas A1 - Seitz, Franz ED - ifo-Institut, T1 - Zehn Argumente gegen Quantitative Easing und den Ankauf von Staatsanleihen durch das Eurosystem JF - ifo-Schnelldienst KW - Geldpolitik KW - Europäische Zentralbank KW - Geldpolitik KW - Europäische Zentralbank Y1 - 2015 UR - https://www.wiso-net.de/document/IFOS__16515B13CF141133EC7E45B3C7CD9467 VL - 2015 IS - 4 SP - 19 EP - 20 ER - TY - JOUR A1 - Jost, Thomas ED - Columbia Centre for Sustainable Investment, T1 - FDI in Russia in difficult times JF - Columbia FDI Perspectives KW - Foreign Direct Investment KW - Direktinvestition KW - Auslandsinvestition Y1 - 2015 UR - http://ccsi.columbia.edu/files/2013/10/No-150-Jost-FINAL.pdf VL - 2015 IS - 150 SP - 1 EP - 7 ER - TY - JOUR A1 - Jost, Thomas A1 - Sauvant, Karl P. T1 - Fortschritte bei globalem Investitionsabkommen JF - Börsenzeitung KW - Investition KW - Vertrag Y1 - 2016 UR - https://www.wiso-net.de/document/BOEZ__2016174028 IS - Ausgabe 174, 9. September 2016 SP - 6 ER - TY - CHAP A1 - Bischof, Alex A1 - Bruhm, Hartmut T1 - GIS-basierte Cloud-Services für die Geländeexploration mit kooperierenden autonomen Systemen T2 - GIS Talk 2016 N2 - Am Zentrum für Wissenschaftliche Services und Transfer der Hochschule Aschaffenburg beschäftigt sich eine Arbeitsgruppe mit der kooperativen Exploration von abgegrenzten Geländebereichen mit dem Ziel einer flächendeckenden Kartierung von Umwelt- oder Infrastrukturdaten. Mehrere multisensoriell bestückte autonome Roboter liefern punktbezogene Daten und Rasterdaten, die in ArcGIS fusioniert und kartiert werden. Umgekehrt werden den Explorationsrobotern über Cloud-Services Ausschnitte aus der globalen Karte zur Verfügung gestellt, die diese für die Bahnplanung und Hindernisvermeidung benötigen. KW - Geoinformationssystem KW - GIS KW - Roboter, mobil KW - mobile robot KW - Geoinformationssystem KW - Mobiler Roboter KW - ArcGIS Y1 - 2016 PB - Esri Deutschland GmbH CY - München ER - TY - GEN A1 - Doll, Konrad A1 - Zindler, Klaus T1 - Hochautomatisiertes Fahren: Sensorik, Sensordatenverarbeitung und Fahrzeugführung T2 - Technologieforum Innovative Sensorik-Anwendungen im Automotive-Bereich N2 - Vortrag KW - Autonomes Fahrzeug KW - Sensortechnik KW - Vortrag Y1 - 2016 VL - 2016 ER - TY - CHAP A1 - Probst, Anne-Catherine A1 - Döhring, Thorsten A1 - Salmaso, Bianca A1 - Proserpio, Laura T1 - Shape measurement of thin glass substrates for X-ray mirrors: cross calibration of different equipments T2 - Proceedings of European Optical Society Annual Meeting 2016 N2 - To predict the angular resolution of future X-ray telescopes combined from thermally formed thin glass mirror segments, submicron accuracy is required on the shape measurements of the individual mirror substrates. A dedicated cross-calibration campaign using instruments of different European research institutions is presented. KW - X-ray KW - mirror KW - calibration KW - glass KW - Röntgenspiegel KW - Kalibrieren Y1 - 2016 VL - 2016 PB - European Optical Society ER - TY - JOUR A1 - Borgeest, Kai A1 - Schneider, Peter Josef ED - Zhang, Dan T1 - PID, Fuzzy and Model Predictive Control Applied to a Practical Nonlinear Plant JF - International Journal of Robotics Applications and Technologies N2 - For the cooling system of a mobile machine with m control variables and with n≤m correction variables different control strategies have been investigated in order to minimize power to save energy and to reduce fan noise with sufficient cooling. The plant is nonlinear and not identified. Three different kinds of controllers have been investigated in several variations, i.e. fuzzy control, PI(D) and model predictive control (MPC). 14 different criteria have been used for evaluation. In many respects a linear controller with fuzzy prediction proved best, in particular the prediction model can handle nonlinear properties of the plant. A problem of advanced control schemes with unidentified plants is the difficulty to prove stability. KW - Construction Machine KW - Nonlinear System KW - Fan Control KW - Model Predictive Control KW - Fuzzy Control KW - Baumaschine KW - Nichtlineares Regelungssystem KW - Prädiktive Regelung KW - Fuzzy-Regelung Y1 - 2016 VL - 4 IS - 1 SP - 19 EP - 43 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Proserpio, Laura A1 - Breunig, Elias A1 - Friedrich, Peter T1 - The challenging development of lightweight glass mirrors for future X-ray telescopes T2 - DGaO Proceedings N2 - Previously used mirror technologies are not able to fulfill the challenging requirements of future X-ray telescopes. A promising new technology under development is the hot slumping of thin glasses. Challenges, design trades and first results are presented, including the thermal shaping process, the development of low stress coatings and the mirror segments integration concept. KW - astronomy KW - telescope KW - mirror KW - X-ray KW - glass KW - Röntgenteleskop KW - Röntgenspiegel Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?nbn:de:0287-2016-B018-0 SN - 1614-8436 VL - 2016 PB - Deutsche Gesellschaft für angewandte Optik CY - Erlangen ER - TY - CHAP A1 - Lechner, Kevin A1 - Döhring, Thorsten T1 - Market study on the enabling technology of computer generated holograms T2 - DGaO Proceedings N2 - Computer generated holograms (CGHs) are used in interferometric testing to enable the high-quality production of non-spherical optical elements. Today the CGH production is mastered by a few manufacturers only. To provide CGH users with an overview on the corresponding market, this market study was raised. A table of commercial and institutional CGH suppliers has been created. KW - CGH KW - hologram KW - market study KW - interferometer KW - Synthetisches Hologramm KW - Marktübersicht KW - Interferometer Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?nbn:de:0287-2016-P009-4 SN - 1614-8436 VL - 2016 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Stollenwerk, Manfred A1 - Wen, Mingwu A1 - Proserpio, Laura ED - den Herder, Jan-Willem A. ED - Takahashi, Tadayuki ED - Bautz, Marshall T1 - Development of low-stress Iridium coatings for astronomical x-ray mirrors T2 - Proceedings of SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray N2 - Previously used mirror technologies are not suitable for the challenging needs of future X-ray telescopes. This is why the required high precision mirror manufacturing triggers new technical developments around the world. Some aspects of X-ray mirrors production are studied within the interdisciplinary project INTRAAST, a German acronym for "industry transfer of astronomical mirror technologies". The project is embedded in a cooperation of Aschaffenburg University of Applied Sciences and the Max-Planck-Institute for extraterrestrial Physics. One important task is the development of low-stress Iridium coatings for X-ray mirrors based on slumped thin glass substrates. The surface figure of the glass substrates is measured before and after the coating process by optical methods. Correlating the surface shape deformation to the parameters of coating deposition, here especially to the Argon sputtering pressure, allows for an optimization of the process. The sputtering parameters also have an influence on the coating layer density and on the micro-roughness of the coatings, influencing their X-ray reflection properties. Unfortunately the optimum coating process parameters seem to be contrarious: low Argon pressure resulted in better micro-roughness and higher density, whereas higher pressure leads to lower coating stress. Therefore additional measures like intermediate coating layers and temperature treatment will be considered for further optimization. The technical approach for the low-stress Iridium coating development, the experimental equipment, and the obtained first experimental results are presented within this paper. KW - telescope KW - mirror KW - coating KW - iridium KW - astronomy KW - Röntgenspiegel KW - Iridium KW - Beschichtung Y1 - 2016 U6 - https://doi.org/10.1117/12.2232074 VL - 2016 IS - 9905 SP - 99056S-1 EP - 99056S-7 ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Burtchen, Dennis A1 - Setzer, Max T1 - Die doppeltgespeiste Synchronmaschine (DGS) - Schaltungstopologie und Regelungskonzept T1 - The doubly fed synchronous machine – circuit topology and control concept T2 - ETG-Fachbericht 139 KW - doppelt gespeiste Maschine KW - Drehstromsynchronmaschine KW - PMSM Y1 - 2013 SN - 978-3-8007-3550-1 VL - 139 PB - VDE-Verlag CY - Berlin und Offenbach ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Staudt, Stefan A1 - Lang, Klaus A1 - Eberlein, Dirk T1 - Hochdynamische Leistungsmessung im elektrischen Antriebsstrang von Elektrofahrzeugen T1 - Highly dynamic power measurement on the electrical power train of electrical drives T2 - ETG-Fachbericht 139 KW - Leistungsmessung KW - Leistungsmessung KW - Triebstrang KW - elektrischer Antriebsstrang Y1 - 2013 SN - 978-3-8007-3550-1 VL - 139 PB - VDE-Verlag CY - 2013 ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Staudt, Stefan A1 - Lang, Klaus A1 - Eberlein, Dirk ED - Schäfer, Heinz T1 - Hochdynamische Leistungsmessung auf der Basis von Rohdaten im Antriebsstrang von Hybrid- und Elektrofahrzeugen T2 - Haus der Technik KW - Leistungsmessung KW - Elektrofahrzeug KW - Leistungsmessung KW - Elektrofahrzeuge Y1 - 2013 SN - 978-3-8169-3239-0 VL - 131 SP - 444 EP - 457 PB - Expert-Verlag CY - Renningen ER - TY - JOUR A1 - Eberlein, Dirk A1 - Lang, Klaus A1 - Teigelkötter, Johannes A1 - Stock, Alexander T1 - Innovatives Messkonzept für elektrische Traktionsantriebe JF - e&i elektrotechnik und informationstechnik KW - Messtechnik KW - Triebstrang KW - Messtechnik KW - elektrischer Antriebsstrang Y1 - 2013 VL - 2013 IS - 130 / 8 SP - 24 EP - 28 PB - Springer ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Eberlein, Dirk A1 - Lang, Klaus T1 - Innovative Measurement System for Inverter-Fed Traction Drives. Raw Data Acquisition and Near Real Time Analysis T2 - EVTeC & APE Japan 2014 KW - data acquisition KW - Datenerfassung KW - Leistungsmessung KW - inverter-fed drive KW - power measurement Y1 - 2014 CY - Yokohama, Japan ER - TY - CHAP A1 - Kowalski, Thomas A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Reis, Thomas ED - IEEE, T1 - Energy Efficient Control Strategy for PMSM with Superconductive Stator Winding T2 - IEEE Transactions on Applied Superconductivity. Applied Superconductivity Conference (ASC) 2014 KW - superconductive machine KW - Drehstromsynchronmaschine KW - PMSM Y1 - 2014 U6 - https://doi.org/10.1109/TASC.2014.2372770 SN - 1051-8223 IS - 25, 3 CY - Charlotte, USA ER - TY - CHAP A1 - Staudt, Stefan A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Teigelkötter, Johannes ED - IEEE, T1 - Raw Data Based Model and High Dynamic Control Concept for Traction Drives powered by Synchronous Reluctance Machines T2 - IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD), 2015 KW - Reluktanzmotor KW - Traktion Y1 - 2015 U6 - https://doi.org/10.1109/WEMDCD.2015.7194530 SP - 204 EP - 209 CY - Torino ER - TY - CHAP A1 - Goldhammer, Michael A1 - Köhler, Sebastian A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Track-Based Forecasting of Pedestrian Behavior by Polynomial Approximation and Multilayer Perceptrons T2 - Intelligent Systems and Applications - Extended and Selected Results from the SAI Intelligent Systems Conference (IntelliSys) 2015 N2 - We present an approach for predicting continuous pedestrian trajectories over a time horizon of 2.5 s by means of polynomial least squares approximation and multilayer perceptron (MLP) artificial neural networks. The training data are gathered from 1075 real urban traffic scenes with uninstructed pedestrians including starting, stopping, walking and bending in. The polynomial approximation provides an extraction of the principal information of the underlying time series in the form of the polynomial coefficients. It is independent of sensor parameters such as cycle time and robust regarding noise. Approximation and prediction can be performed very efficiently. It only takes 35 ms on an Intel Core i7 CPU. Test results show 28% lower prediction errors for starting scenes and 32% for stopping scenes in comparison to applying a constant velocity movement model. Approaches based on MLP without polynomial input or Support Vector Regression (SVR) models as motion predictor are outperformed as well. KW - Fußgänger KW - Verkehrsverhalten KW - Prognose Y1 - 2016 SN - 978-3-319-33386-1 SP - 259 EP - 279 PB - Springer International Publishing ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Kowalski, Thomas A1 - Burtchen, Dennis A1 - Setzer, Max ED - VDE, ED - VDI, T1 - Hocheffizienter Betrieb von permanenterregten Synchronmaschinen am Netz T1 - Highly efficient operation of permanent magnet synchronous ma-chines on grid T2 - ETG-Fachbericht KW - doppel gespeiste Maschine KW - Drehstromsynchronmaschine KW - PMSM KW - Netze Y1 - 2013 SN - 978-3-8007-3546-4 VL - 138 SP - 9 EP - 16 PB - VDE-Verlag CY - Berlin und Offenbach ER - TY - CHAP A1 - Hock, Sascha A1 - Hahnle, Michael A1 - Doll, Konrad T1 - Fusion von Fußgängererkennungen auf FPGAs T2 - 55. Workshop der Multiprojekt-Chip-Gruppe Baden-Württemberg N2 - Viele Verfahren zur Erkennung von Objekten, beispielsweise Fußgängern, in Bildern benutzen das Sliding-Window-Prinzip. Dabei wird ein Fenster von links oben nach rechts unten über das Bild verschoben. Für jedes dieser Fenster wird geprüft, ob es ein zu erkennendes Objekt beinhaltet. Ein Klassifikator liefert dann häufig positive Ergebnisse für mehrere benachbarte Fenster, die einem einzelnen Objekt zugeordnet werden können. Durch den Einsatz von unterschiedlichen Skalenstufen wird dieser Effekt weiter verstärkt. Bei der Detektion von Objekten ist daher eine Fusion dieser Mehrfacherkennungen zu einer einzelnen aussagekräftigen Detektion pro Objekt eine entscheidende Komponente. Des Weiteren müssen sporadisch auftauchende Falscherkennungen eliminiert werden. Diese Fusion von Detektionsergebnissen ist in der bildbasierten Objekterkennung ein wichtiger Verarbeitungsschritt und wird häufig auch als Non Maximum Suppression (NMS) bezeichnet. Eine robuste Fusion von Fußgängerdetektionen kann beispielsweise als Grundlage für ein automobiles Fußgängerwarnsystem oder auch für die Absichtserkennung von Personen im Straßenverkehr genutzt werden. Da diese Systeme Echtzeitanforderungen unterliegen, ist hierfür eine schnelle Berechnung erforderlich. In dieser Arbeit wird die erste, den Autoren bekannte, rein FPGA basierte Implementierung vorgestellt. Sie ist in der Lage, die Erkennungsergebnisse mehrerer paralleler Skalenstufen in Echtzeit zu fusionieren. Auf einem Kintex-7 FPGA eines Xilinx Zynq SoCs ist damit eine Verarbeitung von mehr als 100 Bildern pro Sekunde mit einer Auflösung von 1280 x 720 Pixel möglich. Die Genauigkeit der FPGA-Implementierung ist dabei mit der einer auf OpenCV basierenden Softwareanwendung vergleichbar. KW - Field programmable gate array KW - Objekterkennung Y1 - 2016 ER - TY - CHAP A1 - Teigelkötter, Johannes A1 - Stock, Alexander A1 - Staudt, Stefan A1 - Kowalski, Thomas ED - Schäfer, Heinz ED - Klaffke, Werner T1 - Traktionsantriebe mit hochausgenutzten Synchronreluktanzmaschinen im Niederspannungsbereich T2 - Elektrische Traktions- und Hilfsantriebe für die Elektrifizierung und Hybridisierung von Kraftfahrzeugen KW - Reluktanzmotor KW - Niederspannung Y1 - 2015 SN - 978-3-8007-3546-4 IS - 139 SP - 28 EP - 40 PB - Expert Verlag CY - Renningen ER - TY - CHAP A1 - Staudt, Stefan A1 - Teigelkötter, Johannes A1 - Kowalski, Thomas A1 - Stock, Alexander ED - IEEE, T1 - High-performance Synchronous Reluctance Motors in Low-voltage Applications T2 - 17th European Conference on Power Electronics and Applications (EPE’15 ECCE-Europe), 2015 KW - Niederspannung KW - Reluktanzmotor Y1 - 2015 U6 - https://doi.org/10.1109/EPE.2015.7309226 SP - 1 EP - 10 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Kowalski, Thomas A1 - Staudt, Stefan ED - IEEE, T1 - Highly Efficient Constant-Speed Drive System Based on a Doubly Fed Permanent Magnet Synchronous Machine T2 - 17th European Conference on Power Electronics and Applications (EPE’15 ECCE-Europe), 2015 KW - inverter KW - permanent magnet synchronous machine KW - doubly-fed machine KW - Dauermagneterregter Synchronmotor Y1 - 2015 U6 - https://doi.org/10.1109/EPE.2015.7309228 SP - 1 EP - 10 ER - TY - CHAP A1 - Stock, Alexander A1 - Teigelkötter, Johannes A1 - Staudt, Stefan A1 - Kowalski, Thomas ED - IEEE, T1 - The Doubly Fed Permanent Magnet Synchronous Machine as a Highly Efficient Drive System for Constant Speed Applications T2 - IEEE 11th International Conference on Power Electronics and Drive Systems (PEDS) KW - inverter KW - permanent magnet machine KW - doubly-fed machine KW - Wechselrichter KW - Dauermagneterregter Synchronmotor Y1 - 2015 U6 - https://doi.org/10.1109/PEDS.2015.7203399 SP - 625 EP - 630 CY - Sydney, Australia ER - TY - JOUR A1 - Hahn, Stefan A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Nichtlineare Spurführung benutzerdefinierter Punkte an der Fahrzeugfront JF - at - Automatisierungstechnik KW - Nichtlineare Regelung KW - Spurführung KW - automatisierter Fahrversuch KW - vorausschauende Sicherheitssysteme KW - Nichtlineare Regelung KW - Spurführung Y1 - 2016 U6 - https://doi.org/10.1515/auto-2015-0098 VL - 64 IS - 4 SP - 282 EP - 296 PB - de Gruyter Oldenbourg CY - München ER - TY - CHAP A1 - Zindler, Klaus A1 - Geiß, Niklas T1 - Vehicle Ego-Localization in Autonomous Lane-Keeping Evasive Maneuvers T2 - 8th IFAC Symposium Advances in Automotive Control, Kolmarden, Sweden, 20-23 June, 2016 Y1 - 2016 U6 - https://doi.org/10.1016/j.ifacol.2016.08.025 VL - 49 IS - 11 SP - 160 EP - 167 ER - TY - CHAP A1 - Kranz, Tobias A1 - Hahn, Stefan A1 - Zindler, Klaus T1 - Nonlinear Lateral Vehicle Control in Combined Emergency Steering and Braking Maneuvers T2 - IEEE Intelligent Vehicles Symposium 2016, Gothenburg, Sweden, 19-22 June, 2016 Y1 - 2016 U6 - https://doi.org/10.1109/IVS.2016.7535449 VL - 2016 SP - 603 EP - 610 ER - TY - CHAP A1 - Hahn, Stefan A1 - Zindler, Klaus A1 - Jumar, Ulrich T1 - Two-Degrees-of-Freedom Lateral Vehicle Control using Nonlinear Model Based Disturbance Compensation T2 - 8th IFAC Symposium Advances in Automotive Control, Kolmarden, Sweden, 20-23 June, 2016 Y1 - 2016 U6 - https://doi.org/10.1016/j.ifacol.2016.08.028 VL - 49 IS - 11 SP - 182 EP - 189 ER - TY - BOOK A1 - Hufgard, Andreas A1 - Rauff, Stefanie A1 - Zinow, Rainer T1 - SAP Cloud - Szenarien, Lösungen, Technologie N2 - Von Mittelstandslösungen wie SAP Business One bis zu gezielten Anwendungen wie Simple Finance oder SuccessFactors – dieses Buch stellt Ihnen alle Cloud-Lösungen aus der SAP-Welt ausführlich vor. Erfahren Sie, was die einzelnen Lösungen bieten und was sie kosten. Lesen Sie nach, wie Sie die Systeme einsetzen und wie SAP für die Sicherheit Ihrer Unternehmensdaten sorgt. Ob für Finanzen, im Vertrieb, Marketing oder Personalabteilung: Loten Sie die Möglichkeiten für Ihr Unternehmen aus! KW - SAP KW - Cloud Computing Y1 - 2015 SN - 978-3-8362-3637-9 PB - SAP Press CY - Bonn ER - TY - JOUR A1 - Hufgard, Andreas A1 - Schulz, Johannes T1 - Usage analysis in SAP ERP-Systems for measurement of business maturity - exemplified in purchasing JF - IADIS International Journal on Computer Science and Information Systems KW - SAP ERP Y1 - 2016 VL - 2016 (11) IS - 1 SP - 63 EP - 80 ER - TY - CHAP A1 - Hufgard, Andreas A1 - Schulz, Johannes T1 - Is purchasing more efficient in the automotive industry? Usage-based comparison of business processes in purchasing as exemplified by SAP ERP T2 - Proceedings of the 4th International Conference on Information Systems Post-Implementation and Change Management N2 - In business IT, empirical data is very rarely in the form of corporate usage data from system analyses. This article introduces 105 systems that have been analyzed in-depth, and whose data deliver empirical conclusions about usage and the level of maturity of business processes in purchasing, and quantify the primary types of activities users are involved in. The data was gathered from usage analyses of SAP systems via RBE Plus, a reverse business engineering tool. It is based on the activities of more than 270,000 users in organizations in Europe and the USA. The findings offer enterprises a standard of comparison and reveal potential for improvement in sub-processes. KW - SAP ERP KW - Prozesskette KW - Einkauf Y1 - 2015 SN - 978-989-8533-42-5 SP - 143 EP - 151 ER - TY - JOUR A1 - Hufgard, Andreas A1 - Schulz, Johannes T1 - User activities in business processes - A system-based analysis of specialist users JF - IADIS International Journal on Computer Science and Information Systems N2 - Empirical data based on actual system use is in very short supply. How many transactions do ERP system users execute? In which business processes do most users still play an active role? Answers to these questions are provided in the analysis of 77 user organizations, the subject of this publication. For the first time, these questions can be answered objectively, based on data collected with system-based analyses of live post-implementation SAP systems. The analyses examined activities of over 253,000 users and the data was extracted using RBE Plus, a reverse business engineering tool. Areas of intense usage and user types have been identified objectively, and the findings pinpoint specific sub-processes that reveal potential for improvement. KW - Prozessorganisation Y1 - 2014 VL - 9(2014) IS - 2 SP - 159 EP - 173 ER - TY - CHAP A1 - Hufgard, Andreas A1 - Schulz, Johannes T1 - User activities in business processes - A system-based analysis T2 - Proceedings of the 3rd International Conference on Information Systems Post-Implementation and Change Management N2 - Empirical data based on actual system use is in very short supply. How many transactions do ERP system users execute? In which business processes do most users still play an active role? Answers to these questions are provided in the analysis of 77 user organizations, the subject of this publication. For the first time, these questions can be answered objectively, based on data collected with system-based analyses of live post-implementation SAP systems. The analyses examined activities of over 253,000 users and the data was extracted using RBE Plus, a reverse business engineering tool. Areas of intense usage and user types have been identified objectively, and the findings pinpoint specific sub-processes that reveal potential for improvement. KW - Prozessorganisation Y1 - 2014 SN - 978-989-8704-11-5 SP - 215 EP - 222 ER - TY - CHAP A1 - Rauff, Stefanie A1 - Hufgard, Andreas A1 - Schulz, Johannes T1 - Reverse Business Innovations - Evaluation of relevant new release functions for enterprise systems T2 - Proceedings of the 3rd International Conference on Information Systems Post-Implementation and Change Management N2 - With each new release, enterprise software vendors deliver user organizations a myriad of new functions that can add business value. Organizations are then faced with assessing which of the new functions drive value for them and which do not and so, how much they will benefit from an upgrade. The authors have developed a model for decision support. Various aspects of an upgrade can be assessed with the aid of software tools, such as analyses and evaluations of new functionality with respect to relevance, benefits, profitability, strategic goals and impact. In this article, we will present the portion of this model that can determine which functionality is relevant for an organization and to what extent. Our decision support model applies “reverse” system usage to identify which enterprise system functions are currently being used and which not. Based on usage data and pattern matching, we can determine which new functions add value for organizations. This helps businesses more easily determine which new functions are relevant to them and helps ensure that they continue to see a return on their often very expensive IT and IS investments far into the future. KW - Betriebliches Informationssystem Y1 - 2014 SN - 978-989-8704-11-5 SP - 327 EP - 332 ER - TY - JOUR A1 - Amrhein, Sebastian A1 - Schneider, Mareike A1 - Kaloudis, Michael T1 - Ein zweites Leben für den Akku JF - ReSource KW - Lithium-Ionen-Akkumulator KW - Elektrofahrrad Y1 - 2016 VL - 2016 IS - 1 SP - 10 EP - 16 ER - TY - CHAP A1 - Rauer, Miriam A1 - Xu, Ping A1 - Reinhardt, Andreas A1 - Kaloudis, Michael A1 - Franke, Jörg T1 - Einfluss von Poren in Lötverbindungen bei LED-Anwendungen T2 - Elektronische Baugruppen und Leiterplatten – EBL 2016 KW - Lötverbindung KW - Lumineszenzdiode KW - Pore Y1 - 2016 SN - 978-3-8007-4147-2 SP - 135 EP - 139 PB - VDE Verlag CY - Berlin ER - TY - CHAP A1 - Rauer, Miriam A1 - Schreck, Timo A1 - Härter, Stefan A1 - Kaloudis, Michael T1 - The Effect of Thermal Stress on the Reliability of low Ag Solder Joints in High Power LEDs T2 - 20th European Microelectronics and Packaging Conference (EMPC) & Exhibition, 14.-16.09.2015 KW - Lumineszenzdiode KW - Thermische Belastung KW - Zuverlässigkeit KW - Lötverbindung Y1 - 2015 SP - 1 EP - 6 ER - TY - JOUR A1 - Bachmann, Marco A1 - Amrhein, Sebastian A1 - Kaloudis, Michael T1 - Intelligente Pedelecs fördern. Ein Ansatz zur nachhaltigen Verbesserung unseres Mobilitätsverhaltens JF - Internationales Verkehrswesen KW - Pedelec Y1 - 2016 VL - 2016 IS - 1 SP - 16 EP - 19 ER - TY - BOOK A1 - Borgeest, Kai A1 - Wegener, Georg T1 - Messtechnik und Prüfstände für Verbrennungsmotoren N2 - Messtechnik und Prüfstände für Verbrennungsmotoren helfen, Kraftstoff einzusparen, Treibhausgase und Schadstoffe zu reduzieren, mit kleineren Motoren mehr Leistung abzugeben sowie Komponenten und Betriebsstoffe zu optimieren. Mit den Motoren und der Abgasgesetzgebung entwickelt sich auch die für die Entwicklung erforderliche mechanische, thermodynamische und Abgasmesstechnik weiter. Dieses Buch vermittelt sowohl Studenten, als auch Planern und Betreibern in Industrie und Wissenschaft das nötige umfangreiche Wissen, um Messungen an Motorenprüfständen durchführen zu können. KW - Verbrennungsmotor KW - Prüfstand KW - Messtechnik KW - Verbrennungsmotor, Prüfstand, Messtechnik Y1 - 2016 SN - 978-3-658-10118-3 U6 - https://doi.org/10.1007/978-3-658-10118-3 PB - Springer-Vieweg CY - Wiesbaden ER - TY - GEN A1 - Bruhm, Hartmut T1 - Schnelle Bewegungssteuerung für redundante Kinematiken am Beispiel der Lasermaterialbearbeitung mit Industrierobotern T2 - 16. Kooperationsforum Automation Valley N2 - Vortrag KW - Industrieroboter KW - Lasermaterialbearbeitung KW - Bewegungssteuerung KW - Kinematik KW - Industrieroboter KW - Laserbearbeitung KW - Kinematik KW - Vortrag ; Klingenberg KW - Regelungstechnik Y1 - 2012 ER - TY - BOOK A1 - Bruhm, Hartmut A1 - Heimann, Gerald T1 - KoRTec - Kompetenzzentrum Regelungstechnik: Abschlussbericht KW - KoRTec KW - Regelungstechnik KW - Regelungstechnik Y1 - 2004 ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Fischer, Peter T1 - Sensorische Höhenführung eines Industrieroboters mit verbesserter Dynamik durch Elimination der Steuerungtotzeit T2 - Robotik 2004. Leistungsstand - Anwendungen - Visionen - Trends ; Tagung München, 17. und 18. Juni 2004 KW - Höhenführung KW - Industrieroboter KW - Dynamik KW - Totzeit KW - Industrieroboter KW - Totzeit KW - Dynamik KW - Regelungstechnik Y1 - 2004 VL - 2004 SP - 519 EP - 526 PB - VDI Verlag CY - Düsseldorf ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Fischer, Peter A1 - Stark, Hans-Georg T1 - Optimierung der dynamischen Bahntreue eines Industrieroboters durch datenbankgestützten Reglerentwurf T2 - Robotik 2004, VDI-Bericht 1841 KW - Industrieroboter KW - Reglerentwurf KW - Dynamik KW - Optimierung KW - Industrieroboter KW - Reglerentwurf KW - Dynamik KW - Optimierung KW - Regelungstechnik Y1 - 2004 VL - 2004 SP - 511 EP - 518 PB - VDI Verlag ER - TY - CHAP A1 - Fischer, Peter A1 - Kreß, Viktor A1 - Rieder, Maximilian T1 - Universelle Softwarearchitektur für die autonome Exploration mit mobilen Robotern am Beispiel des ROS-basierten EtaBot T2 - Tagungsband AALE 2016: 13. Fachkonferenz KW - Autonome Exploration KW - Roboter KW - ROS KW - EtaBot KW - Robotik KW - Softwarearchitektur Y1 - 2016 SP - 85 EP - 94 PB - DIV Deutscher Industrieverlag CY - Lübeck ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Czinki, Alexander A1 - Fischer, Peter A1 - Klug, Marcel A1 - Geyer, Julia T1 - EtaBot – Ein autonom agierendes mobiles Robotersystem mit ROS (Robot Operating System) T2 - Tagungsband AALE 2015: 12. Fachkonferenz KW - EtaBot KW - Roboter KW - ROS KW - autonom KW - Robotik KW - Regelungstechnik Y1 - 2015 VL - 2015 PB - Deutscher Industrieverlag CY - München ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Czinki, Alexander T1 - Industrial Robots: Status Quo and Future Trends, in Herakovič, Niko, Debevec, Mihael & Adrović, Edo (Hg.) T2 - Posvet Avtomatizacija strege in montaže 2011: ASM '11 : zbornik posveta : Ljubljana, 7. december 2011 KW - Industrial Robots KW - Industrieroboter Y1 - 2011 ER - TY - JOUR A1 - Bruhm, Hartmut A1 - Czinki, Alexander T1 - Innovation Outlook for Industrial Robotics JF - Ventil KW - Industrial Robots KW - Industrieroboter Y1 - 2012 VL - 2012 IS - 18 SP - 114 EP - 120 ER - TY - GEN A1 - Bruhm, Hartmut T1 - Robotik an der Hochschule Aschaffenburg: Einsatz von MATLAB und Simulink in Forschung und Lehre N2 - Vortrag KW - Robotik KW - MATLAB KW - Simulink KW - Robotik KW - Hochschule Aschaffenburg KW - Regelungstechnik KW - Vortrag Y1 - 2012 ER - TY - GEN A1 - Bruhm, Hartmut T1 - Robotik-Projekte LARISSA und ForTeRob N2 - Vortrag KW - LARISSA KW - ForTeRob KW - Industrieroboter KW - Regelungstechnik KW - Vortrag Y1 - 2012 ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Czinki, Alexander A1 - Lotz, Markus T1 - A new force control strategy improving the force control capabilities of standard industrial robots T2 - Israeli Conference on Robotics 2013 N2 - Vortrag KW - industrial robots KW - Industrieroboter KW - Regelungstechnik Y1 - 2013 VL - 2013 ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Czinki, Alexander A1 - Lotz, Markus T1 - Experimental evaluation of identification methods as a contribution to adaptive force control in industrial robotics, in VDE (Hg.) T2 - ISR/Robotik 2014: Proceedings for the joint conference of ISR 2014, 45th International Symposium on Robotics and Robotik 2014, 8th German Conference on Robotics, 2 - 3 June 2014, Munich, Germany KW - industrial robots KW - Industrieroboter KW - Regelungstechnik Y1 - 2014 VL - 2014 SP - 334 EP - 340 ER - TY - JOUR A1 - Bruhm, Hartmut A1 - Czinki, Alexander A1 - Lotz, Markus T1 - A New Force Control Strategy Improving the Force Control Capabilities of Standard Industrial Robots JF - Journal of Mechanics Engineering and Automation KW - Industrieroboter KW - Steuerungstechnik KW - Regelungstechnik Y1 - 2014 VL - 2014 IS - 4 SP - 276 EP - 283 ER - TY - BOOK A1 - Bruhm, Hartmut T1 - Regelungstechnik KW - Regelungstechnik KW - Regelungstechnik Y1 - 2015 SN - 978-3-945413-23-4 PB - Hochschule Aschaffenburg. (Schriften des Verbundstudiengangs Elektro- und Informationstechnik (B.Eng.)) CY - Koblenz ER - TY - BOOK A1 - Bruhm, Hartmut A1 - Fischer, Peter A1 - Zimlich, Stefan T1 - Automatisierungstechnik KW - Automatisierungstechnik KW - Automatisierungstechnik KW - Regelungstechnik Y1 - 2015 SN - 978-3-945413-15-9 ER - TY - CHAP A1 - Bruhm, Hartmut A1 - Czinki, Alexander A1 - Lotz, Markus T1 - High performance force control – A new approach and suggested benchmark tests T2 - 2nd Conference on Embedded Systems, Computational Intelligence and Telematics in Control 2015: Maribor (Slovenia), 22 - 24 June 2015 KW - Mechatronics KW - robotics and autonomous systems KW - evaluation of embedded systems and applications KW - implementation of embedded computer systems KW - Validation KW - Mechatronik KW - Autonomes System KW - Evaluation KW - Regelungstechnik Y1 - 2015 U6 - https://doi.org/10.1016/j.ifacol.2015.08.126 VL - 2015 SP - 165 EP - 170 ER - TY - CHAP A1 - Köhler, Sebastian A1 - Goldhammer, Michael A1 - Zindler, Klaus A1 - Doll, Konrad A1 - Dietmayer, Klaus T1 - Stereo-Vision-Based Pedestrian's Intention Detection in a Moving Vehicle T2 - Intelligent Transportation Systems (ITSC), 2015 IEEE 18th International Conference on N2 - We present a method to detect starting, stopping and bending in intentions of pedestrians from a moving vehicle based on stereo-vision. The method focuses on urban scenarios where these pedestrian movements are common and may result in critical situations. Pedestrian intentions are determined by means of an image-based motion contour histogram of oriented gradient descriptor. It is based on silhouettes gathered from stereo data and does not require any compensation of appearance changes resulting from the ego-motion of a vehicle. Nevertheless, it covers small movements indicating a pedestrian’s intention. A linear support vector machine with probabilistic estimates is used for classification. We evaluated our method on the publicly available Daimler Pedestrian Path Prediction Benchmark Dataset containing detections of a stateof-the-art pedestrian detector. We detect a pedestrian’s stopping intention from 125 ms to 500 ms before standing still within an accuracy range of 80% to 100%. Bending in is detected from 320 ms to 570 ms after a first visible lateral body movement in the same accuracy range. The intention to cross the road from standing still (starting) is detected 250 ms after the first visible motion and, therefore, within the first step with an accuracy of 100%. KW - Image Motion Analysis KW - Stereo Image Processing KW - Pedestrian Safety KW - Bildfolgenanalyse Y1 - 2015 U6 - https://doi.org/10.1109/ITSC.2015.374 SP - 2317 EP - 2322 ER - TY - JOUR A1 - Preusch, Florian A1 - Rung, Stefan A1 - Hellmann, Ralf T1 - Influence of Polishing Orientation on the Generation of LIPSS on Stainless Steel JF - Journal of Laser Micro/Nanoengineering KW - Laserbearbeitung KW - Nicht rostender Stahl Y1 - 2016 U6 - https://doi.org/10.2961/jlmn.2016.01.0025 VL - 11 SP - 137 EP - 142 ER - TY - CHAP A1 - Goldhammer, Michael A1 - Köhler, Sebastian A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Camera Based Pedestrian Path Prediction by Means of Polynomial Least-squares Approximation and Multilayer Perceptron Neural Networks T2 - SAI Intelligent Systems Conference (IntelliSys), 2015 N2 - This paper provides a method to forecast pedestrian trajectories by means of polynomial least-squares approximation and multilayer perceptron artificial neural networks for traffic safety applications. The approach uses camera based head tracking as input data to predict a continuous trajectory for a 2.5 s future time horizon. Training and test is performed using 1075 recorded tracks of uninstructed pedestrians in common public traffic situations, including many challenging scenarios like starting, stopping and bending in. The neural network approach has the ability to handle these scenes by learning a single implicit movement model independent of a specific motion type. The polynomial approximation provides an extraction of the principal information of the underlying time series in the form of the polynomial coefficients, high independence of input data, e.g., sample rate, and additional noise resistance. Our test results show 24% lower prediction errors for starting scenes and 29% for stopping scenes in comparison to a constant velocity Kalman filter. Approaches using MLP without polynomial input and the usage of Support Vector KW - Artificial Neural Networks KW - Polynomial Approximation KW - Path Prediction KW - Intelligent Vehicles KW - Neuronales Netz KW - Polynomapproximation Y1 - 2015 U6 - https://doi.org/10.1109/IntelliSys.2015.7361171 SP - 390 EP - 399 PB - IEEE ER - TY - CHAP A1 - Pissulla, Daniel A1 - Borgeest, Kai T1 - Energieeffizienter Antrieb eines Mobilroboters mit einem kombinierten DC/BLDC-Motor T2 - Tagungsband 13. AALE-Konferenz 2016 N2 - Das Projekt Etara (Entwicklungs- und Testzentrum für Automatisierung, Robotik und Automo-tive) des Zentrums für wissenschaftliche Services der Hochschule Aschaffenburg entwickelt als Referenzanwendung seiner Hardwareplattform einen Mobilroboter EtaBot für Erkundungs-zwecke. Dieser Roboter dient mittlerweile als Technologieträger für verschiedenste Sensorik, Aktorik und Algorithmen zur Berechnung von Wegen, Karten und vieles mehr. Viele Kompo-nenten des EtaBots sind bedeutende Verbraucher von elektrischer Energie welche nachein-ander analysiert und optimiert werden müssen. So fällt neben dem Rechner auch der Antrieb des EtaBots als großer Energieverbraucher auf, welcher unter anderem mit einer selbst entwickelten Ansteuerung optimiert werden kann. KW - BLDC KW - Antriebssteuerung Y1 - 2016 SP - 243 EP - 248 ER - TY - CHAP A1 - Hofmann, Georg Rainer A1 - Schumacher, Meike T1 - “Case-based Evidences” – eine Theorie Mittlerer Reichweite zur Abschätzung der psycho-sozialen Akzeptanz von IT-Systemen T2 - Angewandte Forschung in der Wirtschaftsinformatik - Prozesse, Technologie, Anwendungen, Systeme und Management 2015 N2 - The approach of the “Case-based Evidences” is a research method which estimates the psycho-social acceptance of a given IT system by a pre-defined user group. For the acceptance of IT, whether active or passive, the central role of trust and confidence in the IT systems’ context has to be emphasized. The “Case-based Evidence” estimation is based on drawing conclusions from isomorphic “analogy sources” – the “evidences” – to the given case. By a series of expert interviews, the synoptic conclusions – having been made – are evaluated. Some recent example projects show the successful application of the method of “Case-based Evidences” as a Middle Range Theory. KW - Akzeptanz Y1 - 2015 SN - 978-3-944330-47-1 SP - 132 EP - 140 PB - mana-Buch CY - Heide ER - TY - RPRT A1 - Schumacher, Meike A1 - Schubert, Katrin A1 - Imhof, Andreas A1 - Hofmann, Georg Rainer A1 - Alm, Wolfgang T1 - ESF-Projekt KaRaBonita - Abschlussbericht N2 - Ziel des vom Europäischen Sozialfond (ESF) ko-finanzierten Projektes war es, Methoden und Prozesse zu entwickeln und vermitteln, die dazu dienen, die Kapitalausstattung für Unternehmen am Bayerischen Untermain zu verbessern, beziehungsweise damit verbundene Arbeitsmarktwirksame Unternehmensexpansionen zu fördern. Die reguläre Laufzeit von KaRaBonita vom 1. April 2013 bis 30. September 2014 wurde um ein halbes Jahr verlängert, um Fragen der Idenitifikation, Kommunikation und spezifischen Wissenstransfers mit kapitalsuchenden KMUs in der Region zu adressieren. KW - ESF-Projekt KW - Rating KW - Kreditvergabe KW - Unternehmensexpansion KW - Rating KW - Kreditgewährung Y1 - 2015 ER - TY - CHAP A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. ED - Pretz, Thomas ED - Wotruba, Hermann T1 - An empirical approach for more effective recycling of electronic components in WEEE T2 - 7th Sensor-Based Sorting & Control 2016 KW - Recycling KW - WEEE KW - Printed Circuit Board Assembly KW - Elektronikschrott KW - Recycling Y1 - 2016 SN - 9783844043235 SP - 249 EP - 258 PB - Shaker CY - Aachen ER - TY - GEN A1 - Wang, Jiaxi A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. T1 - Analyse von elektronischen Altgeräten im Hinblick auf verbesserte Recyclingverfahren N2 - Poster KW - Recycling KW - Elektroschrott KW - Entstückung KW - Abfallwirtschaft KW - Elektronikschrott Y1 - 2016 ER - TY - GEN A1 - Heider, Michael A1 - Bochtler, Ulrich T1 - Trennung technischer Keramiken mit elektrischen Verfahren zur effizienteren Weiterverarbeitung und Wertstoffrückgewinnung N2 - Poster KW - Recycling KW - Elektrostatik KW - Energieeffizienz KW - Partikelfilter KW - Triboelektrik KW - Abfallwirtschaft KW - Elektrostatik Y1 - 2016 ER - TY - CHAP A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. ED - Pretz, Thomas ED - Wotruba, Hermann T1 - Automated Segmentation of Electronic Components on Waste Printed Circuit Boards T2 - 7th Sensor-Based Sorting & Control 2016 KW - Recycling KW - WEEE KW - Segmentation KW - Computer Vision KW - Demontage KW - Elektronikschrott KW - Gedruckte Schaltung Y1 - 2016 SN - 978-3-8440-4323-5 SP - 179 EP - 185 PB - Shaker CY - Herzogenrath ER - TY - CHAP A1 - Abke, Jörg A1 - Sedelmaier, Yvonne A1 - Gold, Carolin T1 - A Retrospective Course Survey of Graduates to Analyse Competencies in Software Engineering T2 - IEEE Global Engineering Education Conference (EDUCON 2014) : Istanbul, Turkey, 3 - 5 April 2014 N2 - University education in Software Engineering is a challenge for both lecturers and students. Software Engineering is a very complex theme requiring various technical and nontechnical skills. At the beginning of a research project we asked which competencies our graduates need in their everyday working life. In this paper the course survey of graduates is described to gain information about necessary expert and interdisciplinary competencies. First of all, the conceptual approach and the research goals are explained. In a second step the research design in detail will be illustrated. Afterwards analyses take place considering this survey in order to get information concerning competencies and to evaluate the course retrospectively considering this expertise. Furthermore it is required to determine whether improvements or deteriorations in chronological sequence through the semesters can be detected. The students' attitude towards this course is not that positive, so also the survey includes this bias. But, as the learning and teaching arrangement shall be designed more attractive for students as well, first their evaluation has to be analysed. The last chapter provides a summary and an outlook how the results of this survey will be used to improve the quality of teaching. All of this combined is intended to contribute towards the development of a Competency Profile and in a wider context to reach the top goal of the project, to obtain recommendations for teaching and learning methods to improve the quality of teaching. KW - Software Engineering KW - Beurteilung KW - Fähigkeit KW - Studium Y1 - 2014 SN - 978-1-4799-3190-3 U6 - https://doi.org/10.1109/EDUCON.2014.6826075 SP - 100 EP - 106 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Kuhn, Martina A1 - Kälberer, Nina A1 - Kraus, Christian A1 - Abke, Jörg A1 - Gold, Carolin T1 - Eine Wiki-Plattform als kollaboratives Kommunikations- und Lernmedium im Software Engineering: Einsatz und Evaluation T2 - Grundfragen Multimedialen Lehrens und Lernens: der Qualitätspakt E-Learning im Hochschulpakt 2020 ; Tagungsband GML 2 2014 [13. - 14. März] KW - Computerunterstütztes Lernen KW - Studium KW - Software Engineering Y1 - 2014 SN - 978-3-8309-3106-5 SP - 334 EP - 336 PB - Waxmann CY - Berlin ER - TY - CHAP A1 - Kuhn, Martina A1 - Abke, Jörg A1 - Gold, Carolin T1 - A New Problem Based Blended Learning Approach in Software Engineering T2 - IEEE Global Engineering Education Conference (EDUCON 2015) : Tallinn, Estonia, 18 - 20 March 2015 N2 - The development of competencies and also the usage of E-Learning and distance education in higher education are key aspects of the Bologna Process. Through the use of E-Learning, individual learning styles (e.g., different learning conditions, speeds and pathways) and competence orientation can be supported and promoted. The combination of traditional classroom teaching and self-study as well as the use of information and communication technologies promise a better quality of teaching. As a result a variety of projects were launched to develop new teaching and learning arrangements while optimizing existing approaches. KW - Integriertes Lernen KW - Studium KW - Software Engineering Y1 - 2015 SN - 978-1-4799-1908-6 U6 - https://doi.org/10.1109/EDUCON.2015.7096083 SP - 920 EP - 925 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Rücker, Johannes A1 - Hesch, Heinz-Xaver A1 - Bochtler, Ulrich A1 - Klar, Peter J. T1 - Automatische Entstückung von Leiterplatten zur Rückgewinnung von Ressourcen JF - PLUS : Produktion von Leiterplatten und Systemen KW - Elektronikschrott KW - Demontage KW - Gedruckte Schaltung Y1 - 2012 VL - 2015 IS - 12 SP - 2472 EP - 2474 PB - Leuze-Verlag CY - Bad Saulgau ER - TY - GEN A1 - Zindler, Klaus A1 - Doll, Konrad T1 - Starke Partner für eine starke Region BT - Bereichsvorstellung AUTOMOTIVE N2 - Vortrag KW - Kraftfahrzeugtechnik Y1 - 2014 ER - TY - CHAP A1 - Rodriguez Perez, Simón A1 - Abke, Jörg A1 - Gold-Veerkamp, Carolin A1 - Borgeest, Kai T1 - Ein neues Lehr-/Lernarrangement als Einstieg in die C-Programmierung mittels LEGO Mindstorms EV3 T2 - Tagungsband zum 2. HDMINT Symposium 2015 N2 - Ziel ist es, die Qualitätsverbesserung des Lehr-/Lernprozesses in der C-Programmierung durch die Integration eines Roboters darzustellen. Dieses neue Konzept wurde bereits teilweise in der Informatikveranstaltung (Studiengang Mechatronik – erstes und zweites Semester mit 180 Minuten pro Woche) umgesetzt. KW - EV3, Didaktik , Informatik KW - LEGO MindStorms KW - Roboter KW - Programmierung Y1 - 2015 SN - 1612-4537 VL - 2015 SP - 272 CY - Nürnberg ER - TY - CHAP A1 - Rodriguez Perez, Simón A1 - Gold-Veerkamp, Carolin A1 - Abke, Jörg A1 - Borgeest, Kai T1 - A New Didactic Method for Programming in C for Freshmen Students Using Lego Mindstorms EV3 T2 - 18th International Conference on Interactive Collaborative Learning, Proceedings N2 - In this paper a new teaching-learning-method including the LEGO Mindstorms EV3 is presented. This computer sciences course is part of the studies of mechatronics in the first two semesters. The programming language being mediated is ANSI-C. Computer science is not the most popular subject in the interdisciplinary engineering field of mechatronics, therefore the EV3 should be included to increase motivation. For the new approach the former course – without the usage of EV3s – was evaluated and a competency profile was identified. On this basis a new didactical method was designed and implemented. The EV3 is programmed with the IDE Eclipse and with a self programmed plug-in. KW - EV3, Didaktik , Informatik KW - LEGO MindStorms KW - C Y1 - 2015 VL - 2015 ER - TY - CHAP A1 - Winter, Anita A1 - Breunig, Elias A1 - Friedrich, Peter A1 - Proserpio, Laura A1 - Döhring, Thorsten T1 - Indirect glass slumping for future X-ray missions: overview, status and progress T2 - Proceedings of SPIE N2 - Future X-ray telescopes aim for large effective area within the given mass limits of the launcher. A promising method is the hot shaping of thin glass sheets via a thermal slumping process. This paper presents the status and progress of the indirect glass slumping technology developed at the Max-Planck-Institut for extraterrestrial Physics (MPE). Recent developments in our research include the use of the mould material Cesic under vacuum, as well as the fabrication of a high-precision slumping mould, which meets the requirements of large, high angular resolution missions like ATHENA. We describe the way forward to optimise the slumping process on these materials, the force-free integration concept and its progress, as well as the first test on reflective coating application. KW - x-ray KW - telescope KW - astronomy KW - glass KW - Astronomie KW - Fernrohr KW - Optisches Glas Y1 - 2015 VL - 2015 IS - 9603 SP - 960308-1 EP - 960308-8 ER - TY - CHAP A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Gong, Qingqing A1 - Proserpio, Laura A1 - Winter, Anita A1 - Friedrich, Peter T1 - The challenge of developing thin mirror shells for future X-ray telescopes T2 - Proceedings of SPIE N2 - Previously used mirror technologies are not able to fulfil the requirements of future X-ray telescopes due to challenging requests from the scientific community. Consequently new technical approaches for X-ray mirror production are under development. In Europe the technical baseline for the planned X-ray observatory ATHENA is the radical new approach of silicon pore optics. NASA´s recently launched NuSTAR mission uses segmented mirrors shells made from thin bended glasses, successfully demonstrating the feasibility of the glass forming technology for X-ray mirrors. For risk mitigation also in Europe the hot slumping of thin glasses is being developed as an alternative technology for lightweight X-ray telescopes. The high precision mirror manufacturing requires challenging technical developments; several design trades and trend-setting decisions need to be made and are discussed within this paper. Some new technical and economic aspects of the intended glass mirror serial production are also studied within the recently started interdisciplinary project INTRAAST, an acronym for “industry transfer of astronomical mirror technologies”. The goal of the project, embedded in a cooperation of the Max-Planck-Institute for extraterrestrial Physics and the University of Applied Sciences Aschaffenburg, is to master the challenge of producing thin mirror shells for future X-ray telescopes. As a first project task the development of low stress coatings for thin glass mirror substrates have been started, the corresponding technical approach and first results are presented. KW - x-ray KW - telescope KW - astronomy KW - glass KW - Astronomie KW - Fernrohr KW - Optisches Glas Y1 - 2015 VL - 2015 IS - 9628 SP - 962809-1 EP - 962809-8 ER - TY - CHAP A1 - Döhring, Thorsten T1 - Abgehoben? Die Erstellung komplexer Angebote für Satellitenkomponenten T2 - Tagungsband zum 2. HD-MINT-Symposium 2015 N2 - Im Studiengang „Internationales Technisches Vertriebsmanagement“ der Hochschule Aschaffenburg werden Vertriebsingenieure für den internationalen Markt ausgebildet. Das über 7 Semester angelegte Bachelorstudium an der Fakultät Ingenieurwissenschaften vermittelt den Studierenden technische Grundlagen, vertriebsorientierte betriebswirtschaftliche Kenntnisse, zwei Fremdsprachen sowie interkulturelle Kompetenzen. Ein laut Studienordnung verbindlich vorgeschriebener Auslandsaufenthalt rundet die Ausbildung ab. Im vierten Studiensemester findet die Lehrveranstaltung „Projektstudie“ als seminaristischer Unterricht mit 4 SWS statt. Hierzu wird der Studienjahrgang in zwei Gruppen aufgeteilt, die von je einem Professor in der Durchführung eines praxisnahen Vertriebsprojektes angeleitet werden. Die Veranstaltung baut auf Modulen vorheriger Semester auf. Die inhaltliche Thematik der Projektarbeiten basiert dabei auf der einschlägigen Berufserfahrung der beiden Dozenten. Eine Gruppe erstellt im Wettbewerb Angebote für die Serienfertigung von Automobil-Kabelsätzen. Die andere Gruppe erarbeitet anhand von Original-Ausschreibungsunterlagen der Europäischen Raumfahrtbehörde konkurrierende Angebote für Satellitenkomponenten. Auf Letzteres wird im Folgenden detaillierter eingegangen. Zu Beginn des Semesters empfinden die Studierenden die Anforderungen des komplexen Angebotsprozesses für ein Satellitenexperiment als Praxisschock. Der komplette Satz der englischsprachigen Ausschreibungsunterlagen inklusive der zu berücksichtigenden Raumfahrtnormen umfasst über 1000 Textseiten, und die zu erstellenden Angebotsunterlagen füllen üblicherweise zwei DIN A4-Ordner. Die Aufgabenteilung im Team relativiert den Arbeitsumfang jedoch erheblich. Am Semesterende überwiegen positivere Rückmeldungen und die Studierenden erkennen an, dass ein deutlicher Lernerfolg vorliegt. Aus Sicht der Dozenten ist diese Projektarbeit eine praxisnahe Vorbereitung auf die Berufsanforderungen eines Vertriebsingenieurs. Die hohe Qualität der erstellten Angebotsunterlagen zeigt, dass die angestrebten Lernziele erreicht wurden. Der Praxisschock einer komplexen Angebotserstellung erfolgt somit bereits im Studium unter Anleitung eines Professors und nicht erst während der Probezeit in einer ersten Vertriebsposition. KW - Didaktik KW - Raumfahrt KW - Projekt KW - Raumfahrt Y1 - 2015 SN - 1612-4537 VL - 2015 SP - 255 EP - 255 ER - TY - CHAP A1 - Borgeest, Kai T1 - Tested once, forever right T2 - Joint IEEE International Symposium on Electromagnetic Compatibility and EMC Europe N2 - EMC tests are usually done with electronic systems from production under comfortable environmental conditions. The scope of the paper is to analyze how aging and variable environment conditions, in particular temperature, change the electromagnetic behavior. For this purpose typical circuits are selected and sensitive parameters are identified. KW - Elektromagnetische Verträglichkeit KW - Prüfung Y1 - 2015 U6 - https://doi.org/10.1109/ISEMC.2015.7256171 ER - TY - GEN A1 - Döhring, Thorsten A1 - Stollenwerk, Manfred A1 - Proserpio, Laura A1 - Winter, Anita T1 - Transfer of astronomical mirror technologies – Project INTRAAST N2 - Poster KW - Optisches Glas KW - Raumfahrt Y1 - 2015 ER - TY - CHAP A1 - Nick, Christoph A1 - Heinlein, Thorsten A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - 3D Carbon Nanotube Electrodes for Sensing of Neural Activity T2 - Elsevier World Congress on Biosensors KW - Kohlenstoff-Nanoröhre Y1 - 2012 CY - Cancun, Mexiko ER - TY - RPRT A1 - Steger, Frederik A1 - Ritter, Sylvia A1 - Daus, Andreas A1 - Frieß, Johannes A1 - Thielemann, Christiane T1 - Analysis of electrophysiological characteristics of cardiomyocytes following radiation exposure KW - Herzmuskelzelle KW - Strahlenbelastung Y1 - 2011 ER - TY - CHAP A1 - Thielemann, Christiane A1 - Ritter, Sylvia A1 - Layer, Paul A1 - Frieß, Johannes A1 - Daus, Andreas A1 - Steger, Frederik A1 - Heselich, Anja T1 - IBER10 - Cellular effects of space radiation with relevance to cardiovascular diseases T2 - European Space Agency - Life in Space for Life on Earth KW - Kosmische Strahlung KW - Kardiovaskuläre Krankheit Y1 - 2012 CY - Aberdeen, Schottland, UK ER - TY - RPRT A1 - Frieß, Johannes A1 - Heselich, Anja A1 - Ritter, Sylvia A1 - Daus, Andreas A1 - Layer, Paul A1 - Thielemann, Christiane T1 - Electrophysiological Effects of Heavy Ion Irradiation on Cardiomyocytes KW - Herzmuskelzelle KW - Elektrophysiologie Y1 - 2012 ER - TY - RPRT A1 - Materna, Miriam A1 - Helm, Alexander A1 - Hessel, Petra A1 - Frieß, Johannes A1 - Thielemann, Christiane A1 - Pignalosa, Diana A1 - Mäntele, Werner A1 - Durante, Marco A1 - Ritter, Sylvia T1 - First electrophysiological studies on mouse embryonic stem cell-derived cardiomyocytes KW - Herzmuskelzelle KW - Elektrophysiologie Y1 - 2012 ER - TY - CHAP A1 - Frieß, Johannes A1 - Heselich, Anja A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Electrophysiological characteristics of cardiomyocytes after heavy ion exposure T2 - Jahrestagung der Gesellschaft für biologische Strahlenforschung KW - Herzmuskelzelle Y1 - 2013 CY - Darmstadt, Deutschland ER - TY - CHAP A1 - Nick, Christoph A1 - Lippert, Paul A1 - Quednau, Sebastian A1 - Schlaak, Helmut A1 - Thielemann, Christiane T1 - Gold Nanopillar Microelectrodes on Low Temperature Curing Polyimide for the Interface with Electrogenic Cells T2 - Middle East Conference on Biomedical Engineering KW - Mikroelektrode Y1 - 2014 SN - 978-1-4799-4799-7 VL - 2014 SP - 55 EP - 58 CY - Doha, Qatar ER - TY - CHAP A1 - Stern, Maike A1 - Nick, Christoph A1 - Thielemann, Christiane T1 - A Novel LabVIEW based Multi-Channel Closed-Loop Stimulator T2 - 9th International Meeting on Substrate-Integrated Micro-electrode Arrays KW - LabVIEW KW - Simulation Y1 - 2014 VL - 2014 CY - Reutlingen, Germany ER - TY - CHAP A1 - Nick, Christoph A1 - Schlaak, Helmut A1 - Thielemann, Christiane T1 - PEDOT:PSS coated Gold Nanopillar Micro-electrodes for Neural Interfaces T2 - 4th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale KW - Mikroelektrode Y1 - 2014 VL - 2014 CY - Taipeh, Taiwan ER - TY - CHAP A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Direct Visualisation of Stored Charges in PECVD ONO-Layers by Kelvin-Probe-Force-Microscopy T2 - 15th International Symposium on Electrets ISE KW - Kelvin-Sonde KW - Rasterkraftmikroskop Y1 - 2014 VL - 2014 CY - Baltimore, USA ER - TY - CHAP A1 - Nick, Christoph A1 - Quednau, Sebastian A1 - Sarwar, Reza A1 - Thielemann, Christiane A1 - Schlaak, Helmut T1 - Gold-Nanodrähte auf Mikroelektroden zur extrazellulären Ableitung elektrogener Zellen T2 - Mikrosystemtechnik Kongress KW - Mikroelektrode Y1 - 2013 PB - VDE Verlag CY - Aachen, Deutschland ER - TY - JOUR A1 - Nick, Christoph A1 - Thielemann, Christiane T1 - Are Carbon Nanotube Microelectrodes Manufactured from Dispersion Stable Enough for Neural Interfaces? JF - BioNanoScience KW - Mikroelektrode KW - Neuronales Netz Y1 - 2014 VL - 2014 IS - 4 / 3 SP - 216 EP - 225 ER - TY - RPRT A1 - Mayer, Margot A1 - Ritter, Sylvia A1 - Thielemann, Christiane T1 - Electrophysiological Effects of Ionising Radiation on Cortical Rat Neurons in vitro KW - Nervenzelle KW - Ionisierende Strahlung Y1 - 2013 ER - TY - RPRT A1 - Frieß, Johannes A1 - Heselich, Anja A1 - Ritter, Sylvia A1 - Layer, Paul A1 - Thielemann, Christiane T1 - Effect of X-rays and titanium ions on cardiomyocyte cultures KW - Herzmuskelzelle KW - Röntgenbestrahlung Y1 - 2013 ER - TY - JOUR A1 - Nick, Christoph A1 - Yadav, Sandeep A1 - Joshi, Ravi A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Growth of Cortical Neurons Grown on Randomly Oriented and Vertically Aligned Dense Carbon Nanotube Networks JF - Beilstein Journal of Nanotechnology KW - Nervenzelle KW - Zellwachstum Y1 - 2014 VL - 5 SP - 1575 EP - 1579 ER - TY - RPRT A1 - Helm, Alexander A1 - Frank, Simon A1 - Frieß, Johannes A1 - Thielemann, Christiane A1 - Durante, Marco A1 - Ritter, Sylvia T1 - Purified cultures of mouse embryonic stem cell-derived cardiomyocytes of electrophysiological studies with ionizing radiation KW - Herzmuskelzelle KW - Ionisierende Strahlung Y1 - 2013 ER - TY - JOUR A1 - Frieß, Johannes A1 - Heselich, Anja A1 - Ritter, Sylvia A1 - Haber, Angelina A1 - Kaiser, Nicole A1 - Layer, Paul A1 - Thielemann, Christiane T1 - Electrophysiologic and cellular characteristics of cardiomyocytes after X-ray irradiation JF - Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis KW - Herzmuskelzelle KW - Röntgenbestrahlung Y1 - 2015 VL - 2015 IS - 777 SP - 1 EP - 10 ER - TY - CHAP A1 - Körbitzer, Berit Silke A1 - Krauß, Peter A1 - Nick, Christoph A1 - Schneider, Jörg A1 - Thielemann, Christiane T1 - Graphene electrodes for recording and stimulation of neural cells T2 - ICREA Workshop on Graphene Nanobiosensors KW - Nervenzelle KW - Elektrostimulation Y1 - 2015 CY - Barcelona, Spanien ER - TY - JOUR A1 - Dressler, Katharina A1 - Rauer, Miriam A1 - Kaloudis, Michael A1 - Dauwe, Stefan A1 - Herguth, Axel A1 - Hahn, Giso T1 - Nondestructive Characterization of Voids in Rear Local Contacts of PERC-Type Solar Cells JF - IEEE Journal of Photovoltaics N2 - In this paper, we present two nondestructive characterization methods for the detection of voids in rear local contacts of passivated emitter and rear-type solar cells, namely scanning acoustic microscopy and computer tomography. We compare both methods and include a comparison with electroluminescence measurements. It is shown in this paper that voids can easily be detected with both measurement types without any sample preparation. We found a good match of scanning acoustic microscopy (SAM) and computer tomography (CT), which is presented for this purpose for the first time. The investigation was carried out for different aluminum pastes. KW - Solarzelle Y1 - 2014 U6 - https://doi.org/10.1109/JPHOTOV.2014.2359745 VL - 2015 IS - 1 SP - 70 EP - 76 ER - TY - JOUR A1 - Rauer, Miriam A1 - Kaloudis, Michael T1 - Computertomographie erweitert das Blickfeld JF - Mikroproduktion KW - Computertomographie Y1 - 2014 VL - 2014 IS - 1 SP - 50 EP - 51 ER - TY - JOUR A1 - Rauer, Miriam A1 - Kaloudis, Michael T1 - Ausfallanalyse an einem Lithium-Ionen Akkumulator JF - Maschinenmarkt KW - Lithium-Ionen-Akkumulator Y1 - 2014 VL - 2014 IS - 2 SP - 45 EP - 46 ER - TY - JOUR A1 - Braunwarth, Louisa A1 - Amrhein, Sebastian A1 - Schreck, Timo A1 - Kaloudis, Michael ED - Huisingh, Donald T1 - Ecological comparison of soldering and sintering as die-attach technologies in power electronics JF - Journal of Cleaner Production N2 - In this study the method of life cycle assessment is used to perform a comparison of two die-attach technologies of power modules: silver sintering and common soldering with a tin–silver–copper solder. The goal of the study is to indicate which die-attach technique is more environmentally friendly. This is important in order to design future electronics more environmentally friendly. Processing covers the manufacturing of the respective pastes, application of pastes, and mounting as well as the subsequent sintering or soldering, including cleaning of the soldered parts. The last step in the processing is a wire bonding process. The environmental impacts are expressed in CO2-equivalents and ReCiPe points and different variants are discussed: comparisons are made between considered pastes and between a soldered and a sintered power module, including consideration of lifetime. Concerning sintering, the influence of using recycled silver is analyzed more closely. The types of stages included in this life cycle assessment best fit a cradle-to-gate assessment, because usage, recycling, and disposal are not included. The software used is OpenLCA version 1.3.3, created by GreenDelta, and the database used is Ecoinvent version 2.2. In order to fill data gaps, electronics manufacturing companies were contacted, and our own calculations and measurements were applied. The consideration of the wet film thicknesses of the soldering system and sintering system, respectively, results in very similar CO2-equivalent emissions for sinter paste and solder paste. Comparing the soldered power module to the sintered one shows minor to significant differences between the two systems which could easily be changed when changing circumstances and assumptions. But when considering the respective lifetimes of the joining technologies, sintering technology is clearly preferable to the conventional soldering technology. Using solely recycled silver for manufacturing of silver sinter paste reduces the CO2-equivalent emissions of one sintered power module by roughly 40%. The results clearly show the dependence of outcomes on the initial settings. Consideration of lifetime has an enormous impact on the comparison of soldering technology to sintering technology. But the benefit of this life extension through the use of sintering technology is only useful when a long lifetime is required. KW - Life cycle assessment; Solder; Sinter; Die-attach; Power electronics; Environment KW - Löten KW - Sintern KW - Leistungselektronik Y1 - 2015 VL - 23 IS - 102 SP - 408 EP - 417 ER - TY - JOUR A1 - Rauer, Miriam A1 - Volkert, Antje A1 - Härter, Stefan A1 - Schreck, Timo A1 - Kaloudis, Michael ED - Stevenson, Michael T1 - Computed-Tomography-Based Analysis of Voids in SnBi57Ag1 Solder Joints and Their Influence on the Reliability JF - Journal of Failure Analysis and Prevention KW - Computertomographie KW - Löten Y1 - 2014 VL - 14 IS - 3 SP - 272 EP - 281 ER - TY - JOUR A1 - Amrhein, Sebastian A1 - Rauer, Miriam ED - Meyendorf, Norbert T1 - Characterization of Computer Tomography Scanners Using the Probability of Detection Method JF - Journal of Nondestructive Evaluation N2 - Industrial computed tomography (CT) is increasingly gaining in importance as a nondestructive testing method (NDT). As with any other NDT method, the requirement for its performance and detection capabilities to be assessed increases as it is used more frequently. Simultaneously, it is becoming important for users to be able to quantitatively measure and compare the suitability of systems available on the market for their own applications. This probability of detection (POD) method makes it possible to create application-specific POD curves for CT systems using a specially-developed POD test specimen. Within the context of this study, a micro-CT scanner with an accelerating voltage of 225 kV and specimens of stainless steel with thicknesses of 1,050 and 2,050 μm was assessed as an example. When developing this method, special value was placed on reproducibility and universal applicability. KW - CT, POD, Test Specimen KW - Computertomographie Y1 - 2014 VL - 33 IS - 4 SP - 643 EP - 650 ER - TY - CHAP A1 - Hahnle, Michael A1 - Saxen, Frerk A1 - Doll, Konrad T1 - Erkennung von Fußgängern in Echtzeit auf FPGAs T2 - 49. MPC-Workshop, Mannheim, Deutschland KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2013 UR - https://www.mpc-gruppe.de/workshopbaende SN - 1868-9221 SP - 57 EP - 65 ER - TY - CHAP A1 - Hahnle, Michael A1 - Saxen, Frerk A1 - Hisung, Matthias A1 - Brunsmann, Ulrich A1 - Doll, Konrad T1 - FPGA-Based Real-Time Pedestrian Detection on High-Resolution Images T2 - 2013 IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), Portland, USA KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2013 SN - 978-0-7695-4990-3 U6 - https://doi.org/10.1109/CVPRW.2013.95 SN - 2160-7508 SP - 629 EP - 635 PB - IEEE ER - TY - CHAP A1 - Goldhammer, Michael A1 - Gerhard, Matthias A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Brunsmann, Ulrich T1 - Early Prediction of a Pedestrian's Trajectory at Intersections T2 - 16th International IEEE Conference on Intelligent Transportation Systems - (ITSC 2013), The Hague, The Netherlands KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2013 SN - 978-1-4799-2914-6 U6 - https://doi.org/10.1109/ITSC.2013.6728239 SP - 237 EP - 242 PB - IEEE ER - TY - JOUR A1 - Köhler, Sebastian A1 - Goldhammer, Michael A1 - Bauer, Sebastian A1 - Zecha, Stephan A1 - Doll, Konrad A1 - Brunsmann, Ulrich A1 - Dietmayer, Klaus T1 - Stationary Detection of the Pedestrian's Intention at Intersections JF - IEEE Intelligent Transportation Systems Magazine KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2013 SN - 1939-1390 VL - 2013 IS - 5 SP - 87 EP - 99 ER - TY - CHAP A1 - Goldhammer, Michael A1 - Doll, Konrad A1 - Brunsmann, Ulrich A1 - Gensler, Andre A1 - Sick, Bernhard T1 - Pedestrian's Trajectory Forecast in Public Traffic with Artificial Neural Networks T2 - 22nd International Conference on Pattern Recognition (ICPR 2014), Stockholm, Sweden KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2014 SN - 978-1-4799-5208-3 U6 - https://doi.org/10.1109/ICPR.2014.704 SN - 1051-4651 SP - 4110 EP - 4115 PB - IEEE ER - TY - CHAP A1 - Goldhammer, Michael A1 - Hubert, Andreas A1 - Köhler, Sebastian A1 - Zindler, Klaus A1 - Brunsmann, Ulrich A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Analysis on Termination of Pedestrians‘ Gait at Urban Intersections T2 - Intelligent Transportation Systems (ITSC), 2014 IEEE 17th International Conference on KW - Fahrerassistenzsystem KW - Fußgänger Y1 - 2014 U6 - https://doi.org/10.1109/ITSC.2014.6957947 SP - 1758 EP - 1763 PB - IEEE CY - Qingdao, China ER - TY - PAT A1 - Zindler, Klaus A1 - Kocherscheidt, Hans T1 - Active vehicle wheel suspension having a linear motor KW - Elektrolinearmotor KW - Radaufhängung Y1 - 2005 ER - TY - PAT A1 - Zindler, Klaus A1 - Kocherscheidt, Hans T1 - Aktive Fahrzeug-Radaufhängung mit einem Linearmotor KW - Elektrolinearmotor KW - Radaufhängung Y1 - 2004 ER - TY - INPR A1 - Zindler, Klaus A1 - Korn, Ulrich T1 - An H∞-based approach to complete modal synthesis ensuring robust steady state accuracy KW - Robuste Regelung Y1 - 1996 ER - TY - INPR A1 - Zindler, Klaus T1 - Entwurf einer robusten Regelung nach der µ-Synthese am Beispiel eines primärseitig verstellbaren Hydrogetriebes KW - Robuste Regelung KW - Flüssigkeitsgetriebe Y1 - 1994 ER - TY - GEN A1 - Zindler, Klaus A1 - Schreiner, Brian A1 - Pfenning, Fabian T1 - Autonome Ausweichmanöver zum Schutz von Fußgängern T2 - Seminar "Fahrzeugregel- und Fahrzeugsicherheitssysteme" KW - Fahrerassistenzsystem KW - Passive Sicherheit Y1 - 2012 VL - 2012 IS - November CY - Obernburg ER -