@article{VersuemerSteffensBlaettermannetal.2020, author = {Vers{\"u}mer, Siegbert and Steffens, Jochen and Bl{\"a}ttermann, Patrick and Becker-Schweitzer, J{\"o}rg}, title = {Modelling evaluations of low-level sounds in everyday situations using linear machine learning for variable selection}, series = {Frontiers in Psychology}, volume = {11}, journal = {Frontiers in Psychology}, publisher = {Frontiers}, issn = {1664-1078}, doi = {10.3389/fpsyg.2020.570761}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-23779}, year = {2020}, language = {en} } @article{SteffensMuellerSchulzetal.2020, author = {Steffens, Jochen and M{\"u}ller, Franz and Schulz, Melanie and Gibson, Samuel}, title = {The effect of inattention and cognitive load on unpleasantness judgments of environmental sounds}, series = {Applied Acoustics}, volume = {164}, journal = {Applied Acoustics}, publisher = {Elsevier}, issn = {0003-682X}, doi = {10.1016/j.apacoust.2020.107278}, year = {2020}, language = {en} } @article{DeckertMohya2020, author = {Deckert, Carsten and Mohya, Ahmed}, title = {Kreativit{\"a}tstechniken f{\"u}r angehende Ingenieurinnen und Ingenieure}, series = {Innovations-Forum}, volume = {18}, journal = {Innovations-Forum}, number = {1}, publisher = {InnoFo}, pages = {42 -- 46}, year = {2020}, abstract = {In Zeiten fortschreitender Digitalisierung und zunehmender Transparenz auf den M{\"a}rkten m{\"u}ssen sich Unternehmen mit zunehmenden Ver{\"a}nderungen, z. B. durch Prozess- und Produktinnovationen, auseinandersetzen. Es ist daher unerl{\"a}sslich, dass sich angehende Ingenieurinnen und Ingenieure mit dem Prozess der Ideenfindung und der damit verbundenen Innovationsbereitschaft auseinandersetzen. Kreativit{\"a}t spielt eine entscheidende Rolle im Prozess der Ideengenerierung und Probleml{\"o}sung. Hochschulen, die Ingenieurstudieng{\"a}nge anbieten, sind daher gefordert, die entsprechenden F{\"a}higkeiten zu vermitteln. Durch den gezielten Einsatz von Kreativit{\"a}tstechniken kann die Kreativit{\"a}t gef{\"o}rdert werden. Der vorliegende Beitrag befasst sich mit der Bewertung unterschiedlicher Kreativit{\"a}tstechniken und geht der Frage nach, welche Kreativit{\"a}tstechniken sich eignen, den angehenden Ingenieurinnen und Ingenieuren beim kreativen Probleml{\"o}sen zu unterst{\"u}tzen.}, subject = {Kreativit{\"a}t}, language = {de} } @article{WeithoferMohren2013, author = {Weithofer, Irene and Mohren, Henning}, title = {Gemeinsam sicher - Nordrhein-Westfalens Hochschulen setzen auf gemeinsames Informationssicherheitsmanagement}, series = {DFN-Mitteilungen}, journal = {DFN-Mitteilungen}, number = {84}, publisher = {DFN-Verein}, pages = {26 -- 29}, year = {2013}, language = {de} } @article{Khabyuk2018, author = {Khabyuk, Olexiy}, title = {\#Micro-In­flu­en­ce: Ver­trau­en im digi­ta­len Zeit­al­ter}, series = {Juna - Zeitschrift des Bayerischen Jugendrings​​}, journal = {Juna - Zeitschrift des Bayerischen Jugendrings​​}, number = {4}, pages = {6 -- 7}, year = {2018}, language = {de} } @article{Khabyuk2019, author = {Khabyuk, Olexiy}, title = {F{\"u}nf Thesen zur Zukunft der Kommunikation}, series = {Schweitzer Forum}, journal = {Schweitzer Forum}, number = {2}, pages = {24 -- 25}, year = {2019}, language = {de} } @article{KraemerKalka2020, author = {Kr{\"a}mer, Andreas and Kalka, Regine}, title = {Zentrale Rolle f{\"u}r das Sales-Team}, series = {Sales Excellence}, volume = {29}, journal = {Sales Excellence}, number = {6}, publisher = {Springer Fachmedien}, doi = {10.1007/s35141-020-0309-7}, pages = {38 -- 41}, year = {2020}, language = {de} } @article{KalkaKraemerZiehe2016, author = {Kalka, Regine and Kr{\"a}mer, Andreas and Ziehe, Nikola}, title = {Personalisiertes und dynamisches Pricing aus Einzelhandels- und Verbrauchersicht}, series = {Marketing review St. Gallen}, volume = {33}, journal = {Marketing review St. Gallen}, number = {6}, pages = {28 -- 37}, year = {2016}, abstract = {Die technologischen Entwicklungen und die zunehmende Akzeptanz digitaler Angebote so- wie die Informationsbeschaffung auf Kundenseite haben f{\"u}r Unternehmen einen erheblichen Einfluss auf die Art, wie Produkte zu individuell berechneten, maßgeschneiderten Preisen den Bedarf einzelner Kunden treffen k{\"o}nnen. Mittels One-to-One-Pricing soll die individuelle Zahlungsbereitschaft der Kunden zu jedem Zeitpunkt exakt getroffen werden. Was sich auf den ersten Blick als neue Chance des Marketings zeigt, hat aus Sicht der Unternehmen und Verbraucher allerdings Grenzen.}, language = {de} } @article{KalkaKraemer2017, author = {Kalka, Regine and Kr{\"a}mer, Andreas}, title = {Kein Anschluss unter dieser Nummer?}, series = {Markenartikel - Das Magazin f{\"u}r Markenf{\"u}hrung}, volume = {80}, journal = {Markenartikel - Das Magazin f{\"u}r Markenf{\"u}hrung}, number = {12}, pages = {100 -- 102}, year = {2017}, language = {de} } @article{KalkaKraemer2016, author = {Kalka, Regine and Kr{\"a}mer, Andreas}, title = {Dynamic Pricing: Verspielt Amazon das Vertrauen seiner Kunden?}, series = {absatzwirtschaft - Zeitschrift f{\"u}r Marketing}, journal = {absatzwirtschaft - Zeitschrift f{\"u}r Marketing}, year = {2016}, abstract = {Dynamische Preisanpassung ist im Netz gang und g{\"a}be. Amazon gilt hier als Vorreiter, der Versandriese {\"a}ndert seine Preise am Tag unz{\"a}hlige Male. Die Nutzer akzeptieren das, solange Angebot und Service stimmen. Doch ihre Toleranz hat Grenzen}, language = {de} } @article{Deckert2019, author = {Deckert, Carsten}, title = {Spannungsfelder der Teamkreativit{\"a}t: Wie Teamklima und -kontext zur Kreativit{\"a}t beitragen}, series = {Ideen und Innovationsmanagement}, journal = {Ideen und Innovationsmanagement}, number = {4}, issn = {2198-3143}, pages = {116 -- 120}, year = {2019}, abstract = {Dieser Beitrag untersucht die Spannungsfelder der Teamkreativit{\"a}t. Die Spannungsfelder basieren auf einer grundlegenden Spannung aus Originalit{\"a}t und Effektivit{\"a}t, die der Standarddefinition der Kreativit{\"a}t zugrunde liegt. Es lassen sich auf Basis des Teamklimas und -kontextes Spannungsfelder hinsichtlich Konformit{\"a}t, Konsens und Koh{\"a}sion identifizieren. Mit Bezug zur Konformit{\"a}t m{\"u}ssen Teams ein positives Spannungsfeld aus der Unterst{\"u}tzung f{\"u}r Innovation und Aufgabenorientierung erreichen, um gleichzeitig Experimentierfreude zu f{\"o}rdern und hohe Qualit{\"a}tsanspr{\"u}che zu erzielen. Konsens entsteht im Spannungsfeld aus konstruktivem Konflikt und partizipatorischer Entscheidungsfindung. Bei der Koh{\"a}sion besteht eine Spannung zwischen der Teamidentit{\"a}t (Geborgenheit) und den individuellen Identit{\"a}ten der Teammitglieder (Diversit{\"a}t). Der Beitrag beschreibt, wie diese drei Spannungsfelder zusammenarbeiten, wenn außergew{\"o}hnliche Kreativit{\"a}t in Teams entsteht.}, subject = {Teamwork}, language = {de} } @article{NeefFritzenSchumacher2003, author = {Neef, Matthias and Fritzen, J. P. and Schumacher, G.}, title = {Evaluation of mount loads in dynamic testing of a jet engine}, series = {Mechanical Systems and Signal Processing}, volume = {17}, journal = {Mechanical Systems and Signal Processing}, number = {3}, publisher = {Elsevier}, doi = {10.1006/mssp.2001.1405}, pages = {665 -- 681}, year = {2003}, abstract = {In the dynamic testing of jet engines the evaluation of loads on the mount structure is vital for comparison with finite element calculations of such testing. Measuring these loads with the help of strain gauges applied to the structure becomes difficult if the mount is overdetermined and thus not every strain gauge can be assigned to a single load direction. In this study, the overdetermined mount structure of the BR715 engine was examined at one of the three mounting points between the Boeing 717 airframe and the engine, where loads in five directions were reacted. Firstly, the dependence of five measured strains upon known static load conditions at the mounting point had to be determined. For this purpose a static calibration test was carried out where defined forces and moments in known directions were applied to the structure while the output from five strain gauges was measured accordingly. The result was the desired relationship between loads and strains in terms of a matrix, which yields the corresponding load condition of the examined mounting point if multiplied with a set of strains. The same calibration procedure was carried out with a finite element model of the mount, where direct comparison to dynamic load results from the model itself was possible. With this model the validity of the above method was shown as well as possible errors which may occur while evaluating dynamic test results. The method was found to give satisfactory results even for dynamic loading, although some inertia forces disturb the signals in dynamic testing. Finally, the results from an actual dynamic engine test were processed into loads and then compared to the simulated loads from a finite element model of the engine. Good agreement was found and the indication of any remaining discrepancies was used to update the model for an even better representation of the dynamic test loads.}, language = {en} } @article{WolterZekornNeef2016, author = {Wolter, Nina and Zekorn, Thomas and Neef, Matthias}, title = {Station{\"a}re thermodynamische Prozesssimulationen am Beispiel eines Industriekraftwerks}, series = {BWK: das Energie-Fachmagazin}, volume = {68}, journal = {BWK: das Energie-Fachmagazin}, number = {6}, pages = {6 -- 10}, year = {2016}, abstract = {Um bauliche Ver{\"a}nderungen in bestehenden Kraftwerksprozessen auf ihre Wirkungsweise untersuchen und thermodynamisch beziehungsweise wirtschaftlich bewerten zu k{\"o}nnen, werden thermische Kraftwerksprozesse mit geeigneter Simulationssoftware abgebildet und in verschiedenen Detaillierungsstufen ausgelegt oder nachgerechnet. Im Folgenden wird ein Weg aufgezeigt, wie mit Hilfe einer station{\"a}ren Simulationssoftware die Gesamtjahresbilanz eines Kraftwerks vorausberechnet werden kann. Mit Hilfe von Prozessdaten aus Vorjahren wird nachgewiesen, dass das Berechnungsmodell das bestehende Kraftwerk mit einer Abweichung von weniger als drei Prozent bez{\"u}glich erzeugter elektrischer Leistung und Brennstoffeinsatz und bei bekannter Dampfproduktion abbilden kann. Das so verifizierte Modell kann zur Untersuchung von Zubaumaßnahmen oder Ver{\"a}nderungen im Kraftwerksprozess eingesetzt werden.}, language = {de} } @article{RoedderNeefLauxetal.2016, author = {Roedder, Maximilian and Neef, Matthias and Laux, Christoph and Priebe, Klaus-P.}, title = {Systematic Fluid Selection for Organic Rankine Cycles and Performance Analysis for a Combined High and Low Temperature Cycle}, series = {Journal of Engineering for Gas Turbines and Power}, volume = {138}, journal = {Journal of Engineering for Gas Turbines and Power}, number = {031701}, publisher = {ASME}, doi = {10.1115/1.4031361}, pages = {168}, year = {2016}, abstract = {The organic Rankine cycle (ORC) is an established thermodynamic process that converts waste heat to electric energy. Due to the wide range of organic working fluids available the fluid selection adds an additional degree-of-freedom to the early design phase of an ORC process. Despite thermodynamic aspects such as the temperature level of the heat source, other technical, economic, and safety aspects have to be considered. For the fluid selection process in this paper, 22 criteria were identified in six main categories while distinguishing between elimination (EC) and tolerance criteria (TC). For an ORC design, the suggested method follows a practical engineering approach and can be used as a structured way to limit the number of interesting working fluids before starting a detailed performance analysis of the most promising candidates. For the first time, the selection process is applied to a two-stage reference cycle, which uses the waste heat of a large reciprocating engine for cogeneration power plants. It consists of a high temperature (HT) and a low temperature (LT) cycle in which the condensation heat of the HT cycle provides the heat input of the LT cycle. After the fluid selection process, the detailed thermodynamic cycle design is carried out with a thermodynamic design tool that also includes a database for organic working fluids. The investigated ORC cycle shows a net thermal efficiency of about 17.4\% in the HT cycle with toluene as the working fluid and 6.2\% in LT cycle with isobutane as the working fluid. The electric efficiency of the cogeneration plant increases from 40.4\% to 46.97\% with the both stages of the two-stage ORC in operation.}, language = {en} } @article{NeefZielkeFussenecker2017, author = {Neef, Matthias and Zielke, Thomas and Fussenecker, Claudia}, title = {„Engineering Conferences": Wissenschaftlich Kommunizieren im Master}, series = {Die Neue Hochschule}, volume = {58}, journal = {Die Neue Hochschule}, number = {3}, pages = {4}, year = {2017}, language = {de} } @article{BonkLauxRoedderetal.2017, author = {Bonk, Christian Dirk and Laux, Christoph and R{\"o}dder, Maximilian and Neef, Matthias}, title = {Design of a 1 KW Organic Rankine Cycle for Teaching and Research Issues}, series = {Energy Procedia}, volume = {129}, journal = {Energy Procedia}, publisher = {Elsevier}, doi = {10.1016/j.egypro.2017.09.117}, pages = {931 -- 938}, year = {2017}, abstract = {This paper deals with the design of a micro-scale ORC plant for teaching and research including the development of an automated control concept. The aim is to provide a safe and environmentally acceptable micro-scale heat engine, which can be developed, implemented and used in university labs for the education of students as well as for small research projects. The test rig allows the support of several learning outcomes on a multi-disciplinary level particularly for the implementation and simulation of small power systems. Special attention was given to the organic working fluid characteristics and its selection process. In addition to the above-mentioned performance goals, favourable safety properties and low global warming potential were decisive in the selection of the novel organic fluid called 3M™ Novec™ 649. The performance and the fluid behaviour of Novec 649 in a micro-scale power cycle are of major interest and the research goal for the test rig presented in this paper. Due to the expected power output of 1 kW, a scroll expander was chosen as the generator drive for the micro plant. In order to design the major parts of the ORC, the thermodynamic simulation software EBSILON®Professional was used. The supply temperature was set to 140 °C. As a result of the simulation, feasible expander inlet pressures spread from 5.5 bar to 8.5 bar. This leads to thermal efficiencies of the ORC in the order of 5 \%. Adding a recuperator to the cycle system decreases the operating pressure range but in the end, the thermal efficiency can be increased by 1.5 \%-points up to 6.2 \%. Finally, an automated control concept is introduced, where the pump is controlled via the fill level measurement system.}, language = {en} } @article{FesekerKinellNeef2018, author = {Feseker, Daniel and Kinell, Mats and Neef, Matthias}, title = {Experimental Study on Pressure Losses in Circular Orifices With Inlet Cross Flow}, series = {Journal of Turbomachinery}, volume = {140}, journal = {Journal of Turbomachinery}, number = {7}, address = {ASME}, doi = {10.1115/1.4039842}, pages = {210}, year = {2018}, abstract = {The ability to understand and predict the pressure losses of orifices is important in order to improve the air flow within the secondary air system. This experimental study investigates the behavior of the discharge coefficient for circular orifices with inlet cross flow which is a common flow case in gas turbines. Examples of this are at the inlet of a film cooling hole or the feeding of air to a blade through an orifice in a rotor disk. Measurements were conducted for a total number of 38 orifices, covering a wide range of length-to-diameter ratios, including short and long orifices with varying inlet geometries. Up to five different chamfer-to-diameter and radius-to-diameter ratios were tested per orifice length. Furthermore, the static pressure ratio across the orifice was varied between 1.05 and 1.6 for all examined orifices. The results of this comprehensive investigation demonstrate the beneficial influence of rounded inlet geometries and the ability to decrease pressure losses, which is especially true for higher cross flow ratios where the reduction of the pressure loss in comparison to sharp-edged holes can be as high as 54\%. With some exceptions, the chamfered orifices show a similar behavior as the rounded ones but with generally lower discharge coefficients. Nevertheless, a chamfered inlet yields lower pressure losses than a sharp-edged inlet. The obtained experimental data were used to develop two correlations for the discharge coefficient as a function of geometrical as well as flow properties.}, language = {en} } @article{DubberkeLinnemannAbbasetal.2018, author = {Dubberke, Frithjof H. and Linnemann, Matthias and Abbas, Wameedh Khider and Baumh{\"o}gger, Elmar and Priebe, Klaus-Peter and Roedder, Maximilian and Neef, Matthias and Vrabec, Jadran}, title = {Experimental setup of a cascaded two-stage organic Rankine cycle}, series = {Applied Thermal Engineering}, volume = {131}, journal = {Applied Thermal Engineering}, publisher = {Elsevier}, doi = {10.1016/j.applthermaleng.2017.11.137}, pages = {958 -- 964}, year = {2018}, abstract = {In combination with a bottoming cycle, operated with a pure fluid in transcritical mode, the usage of a zeotropic mixture as a working fluid appears to be exergetically favorable for power cycle efficiency in cascaded two-stage organic Rankine cycles (CORC). A CORC is set up and initially tested with cyclopentane and propane as working fluids in its high temperature and low temperature cycle, respectively. A thermal oil cycle serves as the heat source and is powered electrically with a maximum heat flow of 158 kW. The design of this experimental setup allows for a rapid replacement of individual components and for a wide range of conditions in terms of fluids and thermodynamic states. The components of all cycles and the measurement and control technology are described in detail. A testing procedure is presented, followed by a discussion of the measurement results, where it is shown that the intended concept of two cascaded organic Rankine cycles is operational and that the measured data are consistent.}, language = {en} } @article{BaierNeef2019, author = {Baier, Andr{\´e} and Neef, Matthias}, title = {Studierende lehren und lernen sozial-{\"o}kologische Verantwortung}, series = {Die Neue Hochschule}, volume = {60}, journal = {Die Neue Hochschule}, number = {5}, organization = {Hochschullehrerbund - Bundesvereinigung - e.V. (hlb)}, pages = {8 -- 11}, year = {2019}, language = {de} } @article{LehmannWittpahlZakouretal.2019, author = {Lehmann, Matthias and Wittpahl, Christian and Zakour, Hatem Ben and Braun, Alexander}, title = {Resolution and accuracy of nonlinear regression of point spread function with artificial neural networks}, series = {Optical Engineering}, volume = {58}, journal = {Optical Engineering}, number = {4}, publisher = {SPIE}, issn = {0091-3286}, doi = {10.1117/1.oe.58.4.045101}, pages = {045101}, year = {2019}, abstract = {We had already demonstrated a numerical model for the point spread function (PSF) of an optical system that can efficiently model both the experimental measurements and the lens design simulations of the PSF. The novelty lies in the portability and the parameterization of this model, which allow for completely new ways to validate optical systems, which is especially interesting not only for mass production optics such as in the automotive industry but also for ophthalmology. The numerical basis for this model is a nonlinear regression of the PSF with an artificial neural network (ANN). After briefly describing both the principle and the applications of the model, we then discuss two optically important aspects: the spatial resolution and the accuracy of the model. Using mean squared error (MSE) as a metric, we vary the topology of the neural network, both in the number of neurons and in the number of hidden layers. Measurement and simulation of a PSF can have a much higher spatial resolution than the typical pixel size used in current camera sensors. We discuss the influence this has on the topology of the ANN. The relative accuracy of the averaged pixel MSE is below 10  -  4, thus giving confidence that the regression does indeed model the measurement data with good accuracy. This article is only the starting point, and we propose several research avenues for future work.}, language = {en} } @article{LehmannWittpahlZakouretal.2019, author = {Lehmann, Matthias and Wittpahl, Christian and Zakour, Hatem Ben and Braun, Alexander}, title = {Modeling realistic optical aberrations to reuse existing drive scene recordings for autonomous driving validation}, series = {Journal of Electronic Imaging}, volume = {28}, journal = {Journal of Electronic Imaging}, number = {1}, publisher = {SPIE}, issn = {1560-229X}, doi = {10.1117/1.JEI.28.1.013005}, pages = {013005}, year = {2019}, abstract = {Training autonomous vehicles requires lots of driving sequences in all situations. Collecting and labeling these drive scenes is a very time-consuming and expensive process. Currently, it is not possible to reuse these drive scenes with different optical properties, because there exists no numerically efficient model for the transfer function of the optical system. We present a numerical model for the point spread function (PSF) of an optical system that can efficiently model both experimental measurements and lens design simulations of the PSF. The numerical basis for this model is a nonlinear regression of the PSF with an artificial neural network. The novelty lies in the portability and the parameterization of this model. We present a lens measurement series, yielding a numerical function for the PSF that depends only on the parameters defocus, field, and azimuth. By convolving existing images and videos with this PSF, we generate images as if seen through the measured lens. The methodology applies to any optical scenario, but we focus on the context of autonomous driving, where the quality of the detection algorithms depends directly on the optical quality of the used camera system. With this model, it is possible to reuse existing recordings, with the potential to avoid millions of test drive miles. The parameterization of the optical model allows for a method to validate the functional and safety limits of camera-based advanced driver assistance systems based on the real, measured lens actually used in the product.}, language = {en} } @article{Deckert2017, author = {Deckert, Carsten}, title = {Spannungsfelder der Corporate Creativity: Einfl{\"u}sse des Arbeitsumfelds auf die organisationale Kreativit{\"a}t}, series = {Zeitschrift OrganisationsEntwicklung}, journal = {Zeitschrift OrganisationsEntwicklung}, number = {3}, pages = {79 -- 82}, year = {2017}, language = {de} } @article{DeckertGuillen2017, author = {Deckert, Carsten and Guill{\´e}n, Viola Isabel Nyssen}, title = {Kulturelle Einfl{\"u}sse auf die nationale Innovationsf{\"a}higkeit}, series = {WiSt - Wirtschaftswissenschaftliches Studium}, volume = {46}, journal = {WiSt - Wirtschaftswissenschaftliches Studium}, number = {7-8}, publisher = {Vahlen}, doi = {10.15358/0340-1650-2017-7-8-25}, pages = {25 -- 31}, year = {2017}, language = {de} } @article{Deckert2017, author = {Deckert, Carsten}, title = {Tensions in Creative Products: Using the Value Square to Model Functional Creativity}, series = {International Journal of Creativity \& Problem Solving}, volume = {26}, journal = {International Journal of Creativity \& Problem Solving}, pages = {71 -- 93}, year = {2017}, language = {en} } @article{BossDeckert2017, author = {Boß, Sebastian and Deckert, Carsten}, title = {Einsatz von PPS-L{\"o}sungen in KMUs}, series = {ZWF Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, volume = {112}, journal = {ZWF Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, number = {11}, publisher = {Hanser}, doi = {10.3139/104.111790}, pages = {811 -- 815}, year = {2017}, abstract = {Das vorliegende Working Paper beschreibt die Entwicklung eines Planspiels zur Simulation selektiver Lagerhaltungsstrategien im Distributionsnetzwerk. Die Gestaltung der Distributionsstruktur hat Auswirkungen auf den Lieferservice und die Kosten (Standort-, Bestands- und Transportkosten), die im Planspiel simuliert werden k{\"o}nnen. Dabei werden insbesondere Aspekte der zentralen und dezentralen Lagerung sowie der Bestandsb{\"u}ndelung und des Sicherheitsbestandes vermittelt. Das Planspiel wurde in MS Excel umgesetzt und in zwei Kursen getestet - in einem Bachelor- und einem MBA-Kurs. Trotz der geringen Komplexit{\"a}t wurde eine vertiefte Lernerfahrung der Studierenden erzielt, die sich durch das selbstt{\"a}tige Ausprobieren und den Spielspaß bei der L{\"o}sungssuche ergab.}, language = {de} } @article{KretschmarNiemannDeckert2019, author = {Kretschmar, Dominik and Niemann, J{\"o}rg and Deckert, Carsten}, title = {Digitalisierungsindex zur prozessnahen Analyse mittelst{\"a}ndischer Unternehmen}, series = {ZWF Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, volume = {114}, journal = {ZWF Zeitschrift f{\"u}r wirtschaftlichen Fabrikbetrieb}, number = {4}, publisher = {Hanser}, issn = {0947-0085}, doi = {10.3139/104.112064}, pages = {213 -- 218}, year = {2019}, language = {de} } @article{DeckertGoers2019, author = {Deckert, Carsten and G{\"o}rs, Nadine}, title = {Transport carbon footprint in the german courier, express and parcel industry (CEP industry)}, series = {Sustainability Management Forum | NachhaltigkeitsManagementForum}, volume = {27}, journal = {Sustainability Management Forum | NachhaltigkeitsManagementForum}, number = {1}, publisher = {Springer}, doi = {10.1007/s00550-018-0471-1}, pages = {23 -- 30}, year = {2019}, language = {en} } @article{Rakow2012, author = {Rakow, Thomas C.}, title = {Touchscreen ersetzt Whiteboard}, series = {FHD Journal}, volume = {33}, journal = {FHD Journal}, number = {2}, pages = {51}, year = {2012}, language = {de} } @article{RakowFaeskornWoykeSchieferetal.2009, author = {Rakow, Thomas C. and Faeskorn-Woyke, Heide and Schiefer, Bernhard and Vossen, Gottfried and W{\"a}sch, J{\"u}rgen}, title = {Tools f{\"u}r die Lehre im Fach Datenbanken}, series = {Datenbank-Spektrum}, volume = {9}, journal = {Datenbank-Spektrum}, number = {29}, issn = {1618-2162}, pages = {5 -- 13}, year = {2009}, language = {de} } @article{GriesertWalczakHerder2003, author = {Griesert, Arnfried and Walczak, Oliver and Herder, Jens}, title = {Interactive Realtime Terrain Visualization for Virtual Set Applications}, series = {Journal of the 3D-Forum Society}, volume = {17}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {20 -- 26}, year = {2003}, abstract = {Virtual set environments for broadcasting become more sophisticated as well as the visual quality improves. Realtime interaction and production-specific visualization implemented through plugin mechanism enhance the existing systems like the virtual studio software 3DK. This work presents an algorithm which can dynamically manage textures of high resolution by prefetching them depending on their requirement in memory and map them on a procedural mesh in realtime. The main goal application of this work is the virtual representation of a flight over a landscape as part of weather reports in virtual studios and the interaction by the moderator.}, language = {en} } @article{Herder2001, author = {Herder, Jens}, title = {Interactive Content Creation with Virtual Set Environments}, series = {Journal of the 3D-Forum Society}, volume = {15}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {53 -- 56}, year = {2001}, abstract = {Digital broadcasting enables interactive \sc tv studios with virtual set environments. This presentation reviews current technology and describes the requirements for such systems. Interoperability over the production, streaming, and viewer levels requires open interfaces. As the technology allow more interaction, it becomes inherent difficult to control the quality of the viewers experience.}, language = {en} } @article{HonnoSuzukiHerder2000, author = {Honno, Kuniaki and Suzuki, Kenji and Herder, Jens}, title = {Distance and Room Effects Control for the PSFC, an Auditory Display using a Loudspeaker Array}, series = {Journal of the 3D-Forum Society}, volume = {14}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {146 -- 151}, year = {2000}, abstract = {The Pioneer Sound Field Controller (PSFC), a loudspeaker array system, features realtime configuration of an entire sound field, including sound source direction, virtual distance, and context of simulated environment (room characteristics: room size and liveness) for each of two sound sources. In the PSFC system, there is no native parameter to specify the distance between the sound source and sound sink (listener) and also no function to control it directrly. This paper suggests the method to control virtual distance using basic parameters: volume, room size and liveness. The implementation of distance cue is an important aspect of 3D sounds. Virtual environments supporting room effects like reverberation not only gain realism but also provide additional information to users about surrounding space. The context switch of different aural attributes is done by using an API of the Sound Spatialization Framework. Therefore, when the sound sink move through two rooms, like a small bathroom and a large living room, the context of the sink switches and different sound is obtained.}, language = {en} } @article{HerderYamazaki2000, author = {Herder, Jens and Yamazaki, Yasuhiro}, title = {A Chatspace Deploying Spatial Audio for Enhanced Conferencing}, series = {Journal of the 3D-Forum Society}, volume = {15}, journal = {Journal of the 3D-Forum Society}, number = {1}, year = {2000}, language = {en} } @article{HerderCohen2002, author = {Herder, Jens and Cohen, Michael}, title = {The Helical Keyboard: Perspectives for Spatial Auditory Displays and Visual Music}, series = {Journal of New Music Research}, volume = {31}, journal = {Journal of New Music Research}, number = {3}, pages = {269 -- 281}, year = {2002}, abstract = {Auditory displays with the ability to dynamically spatialize virtual sound sources under real-time conditions enable advanced applications for art and music. A listener can be deeply immersed while interacting and participating in the experience. We review some of those applications while focusing on the Helical Keyboard project and discussing the required technology. Inspired by the cyclical nature of octaves and helical structure of a scale, a model of a piano-style keyboard was prepared, which was then geometrically warped into a helicoidal configuration, one octave/revolution, pitch mapped to height and chroma. It can be driven by MIDI events, real-time or sequenced, which stream is both synthesized and spatialized by a spatial sound display. The sound of the respective notes is spatialized with respect to sinks, avatars of the human user, by default in the tube of the helix. Alternative coloring schemes can be applied, including a color map compatible with chromastereoptic eyewear. The graphical display animates polygons, interpolating between the notes of a chord across the tube of the helix. Recognition of simple chords allows directionalization of all the notes of a major triad from the position of its musical root. The system is designed to allow, for instance, separate audition of harmony and melody, commonly played by the left and right hands, respectively, on a normal keyboard. Perhaps the most exotic feature of the interface is the ability to fork one{\~A}­s presence, replicating subject instead of object by installing multiple sinks at arbitrary places around a virtual scene so that, for example, harmony and melody can be separately spatialized, using two heads to normalize the octave; such a technique effectively doubles the helix from the perspective of a single listener. Rather than a symmetric arrangement of the individual helices, they are perceptually superimposed in-phase, co-extensively, so that corresponding notes in different registers are at the same azimuth.}, language = {en} } @article{NovotnyJaenschHerder2005, author = {Novotny, Tom and Jaensch, Kai and Herder, Jens}, title = {A Database Driven and Virtual Reality supported Environment for Marketing Studies}, series = {Journal of the 3D-Forum Society}, volume = {19}, journal = {Journal of the 3D-Forum Society}, number = {4}, pages = {95 -- 101}, year = {2005}, abstract = {In today's market research mechanisms multi modal technologies are significant tools to perform flexible and price efficient studies for not only consumer products but also consumer goods. Current appraisal mechanisms in combination with applied computer graphics can improve the assessment of a product's launch in the very early design phase or an innovation process. The combination of online questionnaires, Virtual Reality (VR) applications and a database management system offers a powerful tool to let a consumer judge products as well as innovated goods even without having produced a single article. In this paper we present an approach of consumer good studies consisting of common as well as interactive VR product presentations and online questionnaires bases on a bidirectional database management solution to configure and manage numerous studies, virtual sets, goods and participants in an effective way to support the estimation of the received data. Non-programmers can create their test environment including a VR scenario very quickly without any effort. Within the extensive knowledge of consumer goods, marketing instruments can be defined to shorten and improve the rollout process in the early product stages.}, language = {en} } @article{JuttnerHerder2006, author = {Juttner, Carsten and Herder, Jens}, title = {Lighting an Interactive Scene in Real-time with a GPU and Video Textures}, series = {Journal of the 3D-Forum Society}, volume = {20}, journal = {Journal of the 3D-Forum Society}, number = {1}, pages = {22 -- 28}, year = {2006}, abstract = {The presentation of virtual environments in real time has always been a demanding task. Specially designed graphics hardware is necessary to deal with the large amounts of data these applications typically produce. For several years the chipsets that were used allowed only simple lighting models and fixed algorithms. But recent development has produced new graphics processing units (GPUs) that are much faster and more programmable than their predecessors. This paper presents an approach to take advantage of these new features. It uses a video texture as part of the lighting calculations for the passenger compartment of a virtual train and was run on the GPU of a recent PC graphics card. The task was to map the varying illumination of a filmed landscape onto the virtual objects and also onto another video texture (showing two passengers), thereby enhancing the realism of the scene.}, language = {en} } @article{StruchholzHerderLeckschat2006, author = {Struchholz, Holger and Herder, Jens and Leckschat, Dieter}, title = {Sound radiation simulation of musical instruments based on interpolation and filtering of multi-channel recordings}, series = {Journal of the 3D-Forum Society}, volume = {20}, journal = {Journal of the 3D-Forum Society}, number = {1}, pages = {41 -- 47}, year = {2006}, abstract = {With the virtual environment developed here, the characteristic sound radiation patterns of musical instruments can be experienced in real-time. The user may freely move around a musical instrument, thereby receiving acoustic and visual feedback in real-time. The perception of auditory and visual effects is intensified by the combination of acoustic and visual elements, as well as the option of user interaction. The simulation of characteristic sound radiation patterns is based on interpolating the intensities of a multichannel recording and offers a near-natural mapping of the sound radiation patterns. Additionally, a simple filter has been developed, enabling the qualitative simulation of an instrument's characteristic sound radiation patterns to be easily implemented within real-time 3D applications. Both methods of simulating sound radiation patterns have been evaluated for a saxophone with respect to their functionality and validity by means of spectral analysis and an auditory experiment.}, language = {en} } @article{DaemenHerderKochetal.2017, author = {Daemen, Jeff and Herder, Jens and Koch, Cornelius and Ladwig, Philipp and Wiche, Roman and Wilgen, Kai}, title = {Halbautomatische Steuerung von Kamera und Bildmischer bei Live-{\"U}bertragungen}, series = {Fachzeitschrift f{\"u}r Fernsehen, Film und Elektronische Medien}, journal = {Fachzeitschrift f{\"u}r Fernsehen, Film und Elektronische Medien}, number = {11}, publisher = {Schiele \& Sch{\"o}n}, pages = {501 -- 505}, year = {2017}, abstract = {Live-Video-Broadcasting mit mehreren Kameras erfordert eine Vielzahl von Fachkenntnissen. Robotersysteme erm{\"o}glichen zwar die Automatisierung von g{\"a}ngigen und wiederholten Tracking-Aufnahmen, diese erlauben jedoch keine kurzfristigen Anpassungen aufgrund von unvorhersehbaren Ereignissen. In diesem Beitrag wird ein modulares, automatisiertes Kamerasteuerungs- und Bildschnitt-System eingef{\"u}hrt, das auf grundlegenden kinematografischen Regeln basiert. Die Positionen der Akteure werden durch ein markerloses Tracking-System bereitgestellt. Dar{\"u}ber hinaus werden Tonpegel der Lavaliermikrofone der Akteure zur Analyse der aktuellen Szene verwendet. Ein Expertensystem ermittelt geeignete Kamerawinkel und entscheidet, wann von einer Kamera auf eine andere umgeschaltet werden soll. Eine Testproduktion wurde durchgef{\"u}hrt, um den entwickelten Prototyp in einem Live-Broadcast-Szenario zu beobachten und diente als Videodemonstration f{\"u}r eine Evaluierung.}, language = {de} } @article{DahmThiel2009, author = {Dahm, Markus and Thiel, Christoph}, title = {Gibt es die barrierefreie Brandmauer?}, series = {i-com: Journal of Interactive Media}, volume = {3}, journal = {i-com: Journal of Interactive Media}, number = {7}, issn = {1618-162X}, doi = {10.1524/icom.2008.0029}, pages = {14 -- 18}, year = {2009}, abstract = {Es scheint so zu sein, dass sich die beiden Ziele Gebrauchstauglichkeit und Sicherheit sehr h{\"a}ufig in der Umsetzung gegenseitig ausschließen: Eine sehr sichere Anwendung ist meistens eher aufw{\"a}ndiger zu benutzen und zu warten, eine einfach zu benutzende Anwendung vernachl{\"a}ssigt h{\"a}ufig die Sicherheit. Als L{\"o}sung kann (wieder einmal) darauf hingewiesen werden, dass "gute" Software mehr ist als lediglich funktionierende Software. Im gesamten Entwicklungsprozess m{\"u}ssen vielf{\"a}ltige funktionale und nicht-funktionale Anforderungen, wie die der Sicherheit und Gebrauchstauglichkeit, ber{\"u}cksichtigt werden, um allen, auch sich zun{\"a}chst widersprechenden, Anforderungen gerecht zu werden.}, language = {de} } @article{DahmBarnjakHeilemann2016, author = {Dahm, Markus and Barnjak, Frano and Heilemann, Moritz}, title = {5Code - An Integrated Programming Environment for Beginners}, series = {i-com: Journal of Interactive Media}, volume = {15}, journal = {i-com: Journal of Interactive Media}, number = {1}, issn = {2196-6826}, doi = {10.1515/icom-2016-0002}, pages = {79 -- 92}, year = {2016}, abstract = {Based on experience in teaching programming, we developed the integrated development environment (IDE) 5Code especially to support beginners. As a first step, a simple, understandable formula was developed how to advance from the problem to the program in 5 operative steps: read it → get it → think it → note it → code it. In order to reduce the cognitive load of the learners effectively, 5Code was designed such that all 5 steps are permanently presented, accessible and executable. Thus, learners are provided with the entire programming context from presentation of the task via own notes and annotations to the code area. Learners can mark and annotate any part of the given task's text; these annotations can be edited as notes with own comments. Furthermore, the notes can be dragged into the code area, where they are shown as comments in the coding language. Any modifications in the comments are synchronized between notes and code. 5Code is implemented as a web-application. It is used in university introductory courses on object oriented programming.}, language = {en} }