TY - JOUR A1 - Wolpert, Stefan A1 - Reuter, Carsten T1 - Status Quo of City Logistics in Scientific Literature BT - Systematic Review JF - Transportation Research Record: Journal of the Transportation Research Board N2 - Roadway infrastructure is reaching maximum capacity in urban areas because of expanding urbanization, demographic changes, and continuously increasing freight volumes. An overview of the latest research on city logistics is needed to address these challenges, and a review of the scientific literature is presented. A specifically designed framework for systematic literature review was used to analyze 92 relevant articles from prominent electronic databases. A taxonomy of city logistics literature was created to aid academics and practitioners and to stimulate interest of other parties in this area. KW - Stadtentwicklung KW - Logistik Y1 - 2012 U6 - https://doi.org/10.3141/2269-13 SN - 0361-1981 VL - 2269 IS - 1 SP - 110 EP - 116 PB - SAGE Publications ER - TY - JOUR A1 - Goebel, Philipp A1 - Reuter, Carsten A1 - Pibernik, Richard A1 - Sichtmann, Christina A1 - Bals, Lydia T1 - Purchasing managers' willingness to pay for attributes that constitute sustainability JF - Journal of Operations Management N2 - Considering the increasing international division of labor, as well as stakeholders' growing awareness of sustainability, assuring that business practices are sustainable is a major challenge. Companies have to account for the fact that any misconduct at a supplier's premises may have spillover effects that reach the manufacturer or retailer. Therefore, purchasing managers have to assure that their suppliers are compliant with sustainability standards. This, however, may induce higher purchasing costs and, as a consequence, force a trade‐off between (short term) economic (i.e., purchasing cost reduction) and social/environmental sustainability criteria. How purchasing managers evaluate this trade‐off is particularly interesting because they often receive performance‐based salaries that incentivize the reduction of purchasing costs. Our paper sheds light on this trade‐off by examining how much purchasing managers are willing to pay to assure compliance along different sustainability dimensions when selecting new suppliers in a mature market setting, namely Germany. Additionally, we identify potential (individual, professional, and organization‐related) factors that may impact the purchasing managers' willingness to pay (WTP), and examine their effects. Among the most surprising findings, purchasing managers on average are willing to pay a price premium for manuals that demonstrate compliance with the United Nationals Global Compact (UNGC). Furthermore, the results show that this WTP is mostly influenced (negatively) by self‐enhancement (on the individual level) and/or obedience to authority (on the organizational level), but the effects of company, affiliation with the UNGC, gender, or years of experience have no influence. Moreover, the WTP is higher for the social than for the environmental dimension, and the marginal effect of accreditation on WTP depends on which combinations of dimensions are accredited. KW - Einkauf KW - Einkaufspolitik KW - Nachhaltigkeit Y1 - 2018 U6 - https://doi.org/10.1016/j.jom.2018.08.002 SN - 0272-6963 VL - 62 IS - 1 SP - 44 EP - 58 PB - Wiley ER - TY - CHAP A1 - Hubert, Andreas A1 - Guo, Chenxi A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Improving Fast 6D Pose Estimation with Adaptive Model Fusion T2 - 2025 5th International Conference on Machine Learning and Intelligent Systems Engineering (MLISE) KW - Maschinelles Lernen KW - Deep Learning KW - Montagezelle Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1109/MLISE66443.2025.11100239 SP - 58 EP - 63 PB - IEEE ER - TY - CHAP A1 - Serfling, Benjamin A1 - Reichert, Hannes A1 - Bayerlein, Lorenzo A1 - Doll, Konrad A1 - Radkhah-Lens, Kati T1 - LiDAR Based Semantic Perception for Forklifts in Outdoor Environments T2 - 2025 IEEE International Conference on Service Operations and Logistics, and Informatics (SOLI) KW - Gabelstapler KW - Autonomes Fahrzeug Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1109/SOLI66289.2025.11396313 SP - 40 EP - 45 PB - IEEE ER - TY - CHAP A1 - Hock, Isabell A1 - Haug, Jim A1 - Abke, Jörg T1 - DIDACTIC INTEGRATION OF SELF-STUDY AND FACE-TO-FACE TEACHING: EXPERIENCES WITH AN ADAPTIVE LEARNING SYSTEM IN ENGINEERING EDUCATION T2 - ICERI Proceedings N2 - This paper presents a study of student perspectives on the didactic integration of digital learning elements into face-to-face university lectures and seminars. The overarching context is the use of the adaptive learning system (ALS) HASKI (short for Hochschullehre: Adaptiv, selbstgesteuert, KI-gestützt, i.e. Higher Education: Adaptive, Self-Directed, AI-Supported), which was tested in computer science teaching within a blended learning approach, more specifically in flipped classroom scenarios. The joint project, consisting of three Bavarian universities, focuses on the exploratory integration of an AI-based ALS into higher education. The system was applied in a course for mechatronics students (2nd semester) and provided a variety of adaptive learning elements. HASKI generates individual learning paths with AI based on learning behavior and learning styles. It is designed to promote personalized, self-directed learning as support for blended learning scenarios. The method chosen for data collection is a qualitative content analysis based on exploratory interviews with a semi-structured set of questions. Four central analysis criteria were considered: acceptance and perception of the learning elements, integration into lectures and exercise sessions, didactic coherence, and suggestions for improvement. The results show that students prefer explanatory scripts, interactive tasks, and quiz elements that require a certain degree of reflection. In addition, the respondents are largely convinced of the integration into the seminar, as the HASKI system adequately guides them for what to prepare for. When it comes to embedding the system into lectures, especially in the form of question rotation in small groups, the feedback is ambivalent. Although the potential for in-depth learning was recognized, the low participation of fellow students was critically reflected upon. A particular difficulty mentioned was the lack of coordination between self-study and classroom attendance. While some participants saw this as a discrepancy of coherence, others viewed the adaptive system as a balancing factor. There was a desire for a clearer time structure and more in-depth materials that go beyond mere repetition. Overall, the findings provide initial indicators of successful aspects in the integration of adaptive systems into classroom teaching. The continuous development of a clear didactic division of roles between self-study and classroom phases is of central importance here. Further research with larger samples, if necessary, could provide more comprehensive insights. KW - E-Learning KW - Ingenieurstudium KW - Unterrichtsmethode Y1 - 2025 SN - 978-84-09-78706-7 U6 - https://doi.org/https://doi.org/10.21125/iceri.2025.1600 SN - 2340-1095 VL - 1 SP - 5825 EP - 5829 PB - IATED ER - TY - CHAP A1 - Schoppel, Paul A1 - Haug, Jim A1 - Manz, Julian A1 - Bigler, Dimitri A1 - Hock, Isabell A1 - Abke, Jörg A1 - Hagel, Georg T1 - METHODICAL APPROACH FOR ANALYZING LEARNING PATH FITNESS IN AN AI-BASED ADAPTIVE LEARNING SYSTEM T2 - EDULEARN Proceedings N2 - Learning paths are a cornerstone of many adaptive learning systems, particularly those focusing on adaptive navigational techniques. Evaluating and analyzing these paths is therefore crucial to ensure they effectively support both learners and instructors. For eLearning this process must be highly scalable despite minimal oversight and little to no control over learners’ behavior. Consequently, learning path evaluation should be automated, user-friendly, and precise. However, current research on this topic often emphasizes simulations, performance metrics, or mathematical models, without fully considering the broader, learner-centered aspects necessary for meaningful adaptation. The authors prior findings also indicate that approaches to assessing the suitability of learning paths must be optimized. To address these gaps, this paper presents a potential methodological approach for comprehensive learning path evaluation, aiming to enhance both the precision of adaptive learning systems and the overall learning experience. Three different algorithms, derived from learning style tendencies and a lecturer recommendation, were analyzed as an illustrative example, although the method itself is not constrained by the form or data basis of these algorithms. The adaptive learning system utilizes various measures to gauge the suitability of a learning path, all gathered through real-time learner feedback. These measures include the correlation between students’ preferred path and each algorithm, referred to as it’s fitness, the alignment between students’ actual adherence to a generated path and their own perception of their study behavior as well as their satisfaction with the path, and the connection between algorithm fitness and both actual performance and perceived performance. To collect data, students were asked to create their own preferred learning paths by digitally arranging the provided learning elements after receiving an introduction to the respective categories. Once they had completed a topic with a generated learning path, they rated their satisfaction with it and indicated whether they had followed its sequence. They also estimated whether their knowledge level had changed. Learning analytics were then employed to compare these self-reports with students’ actual study behavior. Performance was measured using a rating system, while Spearman’s Rho and Kendall’s Tau served as the main correlation metrics for data analysis. The results indicate that all three algorithms produce paths more closely aligned with students’ preferred learning paths than the lecturer recommendation, although no single algorithm demonstrated clear dominance. Student satisfaction showed some correlation with the fitness of the generated learning path. Additionally, student ratings appeared to have a slight positive correlation with learning path fitness, whereas self-perceived performance showed no discernible difference. Analysis of the link between actual student behavior and their feedback suggested that students were not reliable in judging whether or not they had followed a learning path. These findings are consistent with the authors earlier work suggesting the potential effectiveness of the learning path algorithms examined, thus supporting this new methodological approach to analyzing learning paths. The study also provided valuable insights for further development; however, its limited sample size remains a challenge for validation. KW - E-Learning KW - Unterrichtsmethode Y1 - 2025 SN - 978-84-09-74218-9 U6 - https://doi.org/https://doi.org/10.21125/edulearn.2025.2430 SN - 2340-1117 VL - 1 SP - 9438 EP - 9446 PB - IATED ER - TY - CHAP A1 - Fischer, David Vincent A1 - Haug, Jim A1 - Schoppel, Paul A1 - Abke, Jörg A1 - Becker, Matthias A1 - Hagel, Georg T1 - Evaluation of a Node-based Automatic Short Answer Tool “NodeGrade” T2 - Proceedings of the 6th European Conference on Software Engineering Education N2 - NodeGrade tries to provide a suitable solution for the problem of time-intensive short answer grading. This research focuses simultaneously on performance, functionality and user experience, which is underlined by a triangulated approach. The evaluation results show comparable performance of NodeGrade on public datasets, even outperforming GPT-4 on the SemEval 2013 Task 7. Matching of NodeGrade’s output with multiple human expert raters reveals some weaknesses regarding cases at the lower and upper boundary. In terms of user experience, the interviewed and observed students recognized both positive facets, like better learning support and helpful feedback, and negative sides, including technical limitations and lack of transparency. Overall, NodeGrade promises high potential for further practical use and testing in the field of software engineering education and automatic short answer grading. KW - Software Engineering KW - Hochschuldidaktik Y1 - 2025 U6 - https://doi.org/https://dl.acm.org/doi/10.1145/3723010.3723021 SP - 20 EP - 29 PB - ACM CY - New York, NY, USA ER - TY - CHAP A1 - Chaar, Mohamad Mofeed A1 - Raiyn, Jamal A1 - Weidl, Galia T1 - Predicting Depth Maps from Single RGB Images and Addressing Missing Information in Depth Estimation T2 - Proceedings of the 11th International Conference on Vehicle Technology and Intelligent Transport Systems N2 - Depth imaging is a crucial area in Autonomous Driving Systems (ADS), as it plays a key role in detecting and measuring objects in the vehicle’s surroundings. However, a significant challenge in this domain arises from missing information in Depth images, where certain points are not measurable due to gaps or inconsistencies in pixel data. Our research addresses two key tasks to overcome this challenge. First, we developed an algorithm using a multi-layered training approach to generate Depth images from a single RGB image. Second, we addressed the issue of missing information in Depth images by applying our algorithm to rectify these gaps, resulting in Depth images with complete and accurate data. We further tested our algorithm on the Cityscapes dataset and successfully resolved the missing information in its Depth images, demonstrating the effectiveness of our approach in real-world urban environments. KW - Autonomes Fahrzeug KW - Tiefenbild Y1 - 2025 U6 - https://doi.org/10.5220/0013365900003941 SP - 549 EP - 556 PB - SCITEPRESS - Science and Technology Publications ER - TY - CHAP A1 - Talluri, Kranthi Kumar A1 - Weidl, Galia A1 - Kasuluru, Vaishnavi T1 - Accident-Driven Congestion Prediction and Simulation: An Explainable Framework Using Advanced Clustering and Bayesian Networks T2 - IEEE 102nd Vehicular Technology Conference N2 - Traffic congestion due to uncertainties, such as accidents, is a significant issue in urban areas, as the ripple effect of accidents causes longer delays, increased emissions, and safety concerns. To address this issue, we propose a robust framework for predicting the impact of accidents on congestion. We implement Automated Machine Learning (AutoML)-enhanced Deep Embedding Clustering (DEC) to assign congestion labels to accident data and predict congestion probability using a Bayesian Network (BN). The Simulation of Urban Mobility (SUMO) simulation is utilized to evaluate the correctness of BN predictions using evidence-based scenarios. Results demonstrate that the AutoML-enhanced DEC has outperformed traditional clustering approaches. The performance of the proposed BN model achieved an overall accuracy of 95.6%, indicating its ability to understand the complex relationship of accidents causing congestion. Validation in SUMO with evidence-based scenarios demonstrated that the BN model's prediction of congestion states closely matches those of SUMO, indicating the high reliability of the proposed BN model in ensuring smooth urban mobility. KW - Verkehrsstau KW - Verkehrsunfall KW - Maschinelles Lernen Y1 - 2025 UR - https://www.researchgate.net/publication/394121957_Accident-Driven_Congestion_Prediction_and_Simulation_An_Explainable_Framework_Using_Advanced_Clustering_and_Bayesian_Networks U6 - https://doi.org/10.48550/arXiv.2507.22529 ER - TY - CHAP A1 - Talluri, Kranthi Kumar A1 - Stang, Christopher A1 - Weidl, Galia T1 - Green Wave as an Integral Part for the Optimization of Traffic Efficiency and Safety: A Survey T2 - 2025 IEEE Intelligent Vehicles Symposium (IV) N2 - Green Wave provides practical and advanced solutions to improve traffic efficiency and safety through network coordination. Nevertheless, the complete potential of Green Wave systems has yet to be explored. Utilizing emerging technologies and advanced algorithms, such as AI or V2X, would aid in achieving more robust traffic management strategies, especially when integrated with Green Wave. This work comprehensively surveys existing traffic control strategies that enable Green Waves and analyzes their impact on future traffic management systems and urban infrastructure. Understanding previous research on traffic management and its effect on traffic efficiency and safety helps explore the integration of Green Wave solutions with smart city initiatives for effective traffic signal coordination. This paper also discusses the advantages of using Green Wave strategies for emission reduction and considers road safety issues for vulnerable road users, such as pedestrians and cyclists. Finally, the existing challenges and research gaps in building robust and successful Green Wave systems are discussed to articulate explicitly the future requirement of sustainable urban transport. KW - Verkehrsregelung KW - Smart City Y1 - 2025 U6 - https://doi.org/10.1109/IV64158.2025.11097706 SP - 2422 EP - 2429 PB - IEEE ER - TY - CHAP A1 - Talluri, Kranthi Kumar A1 - Madsen, Anders L. A1 - Weidl, Galia T1 - Enhancing Safety Standards in Automated Systems Using Dynamic Bayesian Networks T2 - 2025 IEEE Intelligent Vehicles Symposium (IV) N2 - Cut-in maneuvers in high-speed traffic pose critical challenges that can lead to abrupt braking and collisions, necessitating safe and efficient lane change strategies. We propose a Dynamic Bayesian Network (DBN) framework to integrate lateral evidence with safety assessment models, thereby predicting lane changes and ensuring safe cut-in maneuvers effectively. Our proposed framework comprises three key probabilistic hypotheses (lateral evidence, lateral safety, and longitudinal safety) that facilitate the decision-making process through dynamic data processing and assessments of vehicle positions, lateral velocities, relative distance, and Time-to-Collision (TTC) computations. The DBN model's performance compared with other conventional approaches demonstrates superior performance in crash reduction, especially in critical high-speed scenarios, while maintaining a competitive performance in low-speed scenarios. This paves the way for robust, scalable, and efficient safety validation in automated driving systems. KW - Unfallverhütung KW - Schnellfahrstrecke KW - Autonomes Fahrzeug Y1 - 2025 UR - https://www.researchgate.net/publication/391461422_Enhancing_Safety_Standards_in_Automated_Systems_Using_Dynamic_Bayesian_Networks U6 - https://doi.org/10.48550/arXiv.2505.02050 ER - TY - JOUR A1 - Sommer, David A1 - Peters, Maximilian A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Enhancing mechanical properties of double-periodic lattice structures using hybrid-additive manufacturing JF - The International Journal of Advanced Manufacturing Technology N2 - We report on a study of the mechanical properties of hybrid-additive manufactured Inconel 718 double-periodic lattice structures. For this, a hybrid approach, combining Laser Powder Bed Fusion (PBF-LB/M) and in-situ high-speed milling, is employed. Within this technique, the PBF-LB/M process is interrupted after several layers, as the milling process starts, enabling a machining of inlaying structures. KW - Hochgeschwindigkeitsfräsen Y1 - 2026 U6 - https://doi.org/https://doi.org/10.1007/s00170-025-17373-y SN - 0268-3768 VL - 142 IS - 7-8 SP - 4065 EP - 4071 PB - Springer Science and Business Media LLC ER - TY - JOUR A1 - Sommer, David A1 - Truetsch, Ben A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Effect of Hot Isostatic Pressing and Sequenced Heat Treatment on the Mechanical Properties of Hybrid Additive Manufactured Inconel 718 Components JF - Journal of Manufacturing and Materials Processing N2 - We report on the effect of hot isostatic pressing combined with solution and ageing treatment in different sequences on the mechanical properties of Inconel 718 specimens, which in turn have been fabricated by a hybrid additive manufacturing approach. The latter combines conventional laser powder bed fusion and in-situ high speed milling, yielding superior surface quality as being quantified by Ra about 1 μm. In a comparative study between hybrid additively manufactured parts and those built without milling, we find that, in general, any combination of heat treatment leads to a higher ultimate tensile strength and an improved endurance limit, while, however, hot isostatic pressing affects these figures of merit most. In addition, metallographic analysis reveals increased density and hardness for hot isostatic pressed parts due to precipitation hardening. These improvements of the mechanical properties are found to be even more pronounced when the printed parts are manufactured by the hybrid additive approach, i.e., for parts with improved surface conditions. KW - Isostatisches Heißpressen Y1 - 2025 U6 - https://doi.org/https://doi.org/10.3390/jmmp9110378 SN - 2504-4494 VL - 9 IS - 11 PB - MDPI AG ER - TY - JOUR A1 - Sommer, David A1 - Hornung, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - In situ high-speed milling and thermal post-processing for the optimization of fatigue behaviour of additive-manufactured IN718 components JF - Journal of Materials Research N2 - We report on the optimization of tensile properties and fatigue behaviour of Laser Powder Bed Fusion (PBF-LB/M)-built IN718 components employing an innovative hybrid additive-subtractive technology and various heat treatments. The hybrid approach comprises PBF-LB/M with in situ high-speed milling. Double Ageing, solution and ageing treatment, as well as Hot Isostatic Pressing are used to improve ultimate tensile strength and endurance limit. As a result, the advantages of the hybrid-machined components are clearly demonstrated by their improved mechanical properties. These enhanced properties are associated to changes in microstructure, which are identified as precipitations of IN718. Furthermore, crack initiation and crack growth for high cycle numbers as well as sudden fractures are determined. KW - Hochgeschwindigkeitsfräsen Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1557/s43578-025-01656-x SN - 0884-2914 VL - 40 IS - 16 SP - 2388 EP - 2401 PB - Springer Science and Business Media LLC ER - TY - JOUR A1 - Sommer, David A1 - Hornung, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Evaluation of the Impact of Heat Treatment Processes and Surface Conditions on the Mechanical Properties of PBF-LB/M-Built Inconel 718 Components JF - Materials Science Forum N2 - A study of the mechanical properties of hybrid additive manufactured IN718 components is presented, optimising mechanical properties due to an in-situ high-speed milling and different heat treatment processes. At first, the impact of different heat treatment processes is investigated, as the changes in microstructure during the process lead to different mechanical properties. Static and dynamic mechanical load behaviour is tested, quantifying microstructural changes by means of the Ultimate Tensile Strength (UTS) and the endurance limit. Furthermore, sole PBF-LB/M- and hybrid built components are compared, investigating the effect of a surface finish on the static and dynamic load behaviour, as superficial cracks and melting errors diminish the UTS and the endurance limit of PBF-LB/M-built components. Within these experiments, a change of fatigue behaviour for the heat-treatedstates can be observed, compared to the as-built state of the PBF-LB/M, as the development of different phases during heat treatment leads to an improvement of the endurance limit for, e.g., solution and ageing treated components. Additionally, the improvement of the surface quality to Ra = 2 µm leads to a significant increase of the dynamic mechanical load behaviour of hybrid-built components, as superficial cracks and surface defects are reduced. KW - Hochgeschwindigkeitsfräsen Y1 - 2025 U6 - https://doi.org/https://doi.org/10.4028/p-9gR9cI SN - 1662-9752 VL - 1155 SP - 11 EP - 17 PB - Trans Tech Publications, Ltd. ER - TY - JOUR A1 - Sommer, David A1 - Hellmann, Ralf T1 - On the Impact of Process Parameters and Ambient Temperature on Tensile Strength and Fatigue Behaviour of SLS-Built Polyamide-12 JF - Key Engineering Materials N2 - We report on a comprehensive study of tensile strength and fatigue behaviour depending on process parameters and ambient temperature. For this, Polyamide-12 components are fabricated using Selective Laser Sintering. Firstly, different process parameters like, e.g, scan-speed, laser power, and applied energy density are varied. Secondly, the ambient temperature during testing is varied, evaluating the impact of decreased, respectively increased test temperatures on the characteristics of the Polyamide-12 components. For all components, the static and dynamic mechanical load behaviour is investigated, quantifying the changes in the Ultimate Tensile Strength (UTS) and the endurance limit. As the applied energy density transpires as a decisive parameter, a variation leads to significant changes in UTS and endurance limit, whereas an adjustment of scan-speed and laser power at a constant energy density do not affect the mechanical properties. Finally, the ambient temperature during testing is evaluated, demonstrating different ambient application conditions. The impact of an active cooling of the component as well as increased temperatures on the mechanical behaviour is tested, providing fundamental findings on the operating life of Polyamide-12 components. KW - Selektives Laserstrahlsintern Y1 - 2025 U6 - https://doi.org/https://doi.org/10.4028/p-F0XrgQ SN - 1662-9795 VL - 1019 SP - 31 EP - 36 PB - Trans Tech Publications, Ltd. ER - TY - JOUR A1 - Sommer, David A1 - Hornung, Simon A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Design Guide for Hybrid-Additive Manufacturing of Inconel 718 Combining PBF-LB/M and In Situ High-Speed Milling JF - Journal of Manufacturing and Materials Processing N2 - As the correlation between design rules and process limitations is of the upmost importance for the full exploitation of any manufacturing technology, we report a design guide for hybrid-additive manufacturing of Inconel 718. Basic limitations need to be evaluated for this particular hybrid approach that combines laser powder bed fusion (PBF-LB/M) and in situ high-speed milling. Fundamental geometric limitations are examined with regard to the minimum feasible wall thickness, cylinders, overhanging structures, and chamfers. Furthermore, geometrical restrictions due to the integrated three-axis milling process with respect to inclinations, inner angles, notches, and boreholes are investigated. From these findings, we derive design guidelines for a reliable build process using this hybrid manufacturing. Additionally, a design guideline for the hybrid-additive manufacturing approach is presented, depicting a step-to-step guide for the adjustment of constructions. To demonstrate this, a powder nozzle for a direct energy deposition (DED-LB/M) process is redesigned following the previously defined guidelines. This redesign encompasses analysis of the existing component and identification of problematic areas such as flat angles, leading to a new construction that is suitable for a hybrid-additive manufacturing approach. KW - Hochgeschwindigkeitsfräsen Y1 - 2025 U6 - https://doi.org/https://doi.org/10.3390/jmmp9030088 SN - 2504-4494 VL - 9 IS - 3 PB - MDPI AG ER - TY - JOUR A1 - Sommer, David A1 - Truetsch, Ben A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fractographic Analysis and Fatigue Behavior of Additively Manufactured Ni‐Superalloy Components with Post Processing Heat Treatment and Hot Isostatic Pressing JF - Advanced Engineering Materials N2 - A report is made on a study of mechanical properties and fractographic characteristics of laser powder bed fusion (PBF‐LB/M)‐built Inconel 718, performing heat treatments and hot‐isostatic pressing. For this, tensile components are heat‐treated by different processes, as namely stress relief (SR), SR and double aging (SR + DA), and hot‐isostatic pressing are conducted. For the mechanical testing, the ultimate tensile strength (UTS) as well as the fatigue behavior are evaluated, examining differences in maximum load behavior, elongation, and the different regimes of fatigue. As changes in material structure can be observed, the sole SR leads to a diminished UTS, while the combination of SR + DA develops an UTS of R m  = 1277 MPa. Within the fatigue behavior, the HIP shows a very balanced material structure with an increased high cycle and very high cycle regime, as the texture gets homogenized during the heat treatment. The metallographic analysis can quantify the material changes, as the density and the hardness are improved by virtue of the heat treatments. Furthermore, the fractographic analysis shows the differences in fracture behavior, arising due to the microstructural changes, as crack initiation points, crack propagation, and forced fractures can be categorized by scanning electron microscopy. KW - Nickellegierung KW - Superlegierung Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1002/adem.202500078 SN - 1438-1656 VL - 27 IS - 12 PB - Wiley ER - TY - JOUR A1 - Bischoff, Kay A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Femtosecond reductive Laser Sintering under multiple focus conditions for rapid production of conductive copper layers JF - Procedia CIRP N2 - Reductive laser sintering is an advantageous alternative to conventional precious metal- or mask-based processes for the electrification of polymers and has been demonstrated in a variety of sensor applications. Ultrashort pulsed lasers promise precise control of the energy applied during sintering and ablation. Besides fine tracks, microelectronic circuits include wide contact pads, which leads to time-consuming processing with small laser spot sizes. The use of larger focal diameters, which results in wider lines and thus a higher metallization rate, is accompanied by a loss of structure resolution. We show the influence of focusing on the femtosecond reductive laser sintering of copper(II) oxide on cyclic olefin copolymers. While small focus diameters down to 23 µm provide high accuracy, increasing the laser power and the focus diameter up to 400 µm significantly accelerates the process, first by enlarging the line width and second by increasing the scanning speed due to the exposure time. Two-dimensional copper electrodes for 23 µm and 200 µm focal diameters were generated by hatching individual lines and compared with respect to their morphology. The enlarged spot can be used for high-speed generation of electrodes with a surface conductivity of 117 mΩ/sq. Hybrid processes with production under combined focusing conditions are presented for the first time. KW - Laserstrahlsintern KW - Ultrakurzzeitlaser Y1 - 2024 U6 - https://doi.org/10.1016/j.procir.2024.08.189 SN - 2212-8271 VL - 124 IS - 124 SP - 629 EP - 633 PB - Elsevier BV ER - TY - CHAP A1 - Franz, Daniel A1 - Schuster, David A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Ultrashort pulsed laser drilling of through-glass vias for glass core packaging T2 - Proceedings of LAMP2025 – the 9th International Congress on Laser Advanced Materials Processing, Ise-City, Japan, June 2025 KW - Ultrakurzzeitlaser KW - Laserbohren Y1 - 2025 ER - TY - JOUR A1 - Franz, Daniel A1 - Yang, Yongting A1 - Esen, Cemal A1 - Hellmann, Ralf ED - Esen, Cemal T1 - Flexible 2D Laser Cutting of Ultra-Thin Glass Using an Ultrashort Pulsed Laser Robotic System JF - Journal of Laser Micro/Nanoengineering KW - Laserschneiden KW - Ultrakurzzeitlaser Y1 - 2026 U6 - https://doi.org/10.2961/jlmn.2026.01.2004 SN - 1880-0688 VL - 21 IS - 1 PB - Japan Laser Processing Society ER - TY - JOUR A1 - Franz, Daniel A1 - Schuster, David A1 - Schwarz, Simon A1 - Rung, Stefan A1 - Esen, Cemal A1 - Hellmann, Ralf T1 - Fabrication and analysis of through-glass vias for glass-based electronic packaging using an ultrashort pulsed laser JF - Optics and Lasers in Engineering KW - Ultrakurzzeitlaser KW - Laserbohren Y1 - 2025 U6 - https://doi.org/10.1016/j.optlaseng.2025.109106 SN - 0143-8166 VL - 193 PB - Elsevier BV ER - TY - CHAP A1 - Probst, Anne-Catherine A1 - Neumaier, Marcel A1 - Hufgard, Christopher A1 - Wölfel, Maximilian A1 - Schmitt, Christoph A1 - Bochtler, Ulrich T1 - Network Planning a Digital TETRA-Simulcast-System T2 - Kleinheubacher Tagung, Miltenberg, 23.09.2025 - 25.09.2025 KW - TETRA, Telekommunikation Y1 - 2025 ER - TY - JOUR A1 - Altmann, Alexander Anton A1 - Suppelt, Sven A1 - Wüst, Philipp A1 - Dörsam, Jan Helge A1 - Latsch, Bastian A1 - Flachs, Dennis A1 - Blaeser, Andreas A1 - Zhang, Xiaoqing A1 - Thielemann, Christiane A1 - Seggern, Heinz von A1 - Kupnik, Mario T1 - Self-supporting mid-air 3D printing of single-layer polypropylene structures: Flow rate-dependent analytical modeling and surface characterization JF - Additive Manufacturing N2 - High-precision deposition in material extrusion-based additive manufacturing (MEX-AM), especially in mid-air extrusion, is essential for creating microfluidic channels, integrated sensors, and tissue scaffolds with fine vascular features. However, despite advances in support-free slicing and multi-axis printing, no standardized method exists for fabricating enclosed air cavities with high shape fidelity, particularly in single-layer structures. Reliable deposition at sub-millimeter scales remains challenging, especially when printing low-stiffness polymers such as polypropylene (PP), due to delayed solidification and viscoelastic effects. This study introduces a flow-rate-dependent analytical model to predict extrusion behavior, interfacial bonding, and surface morphology in self-supporting single-layer PP structures. To validate the model, surface roughness, material distribution, and intralayer bonding were quantified using spectral analysis, cross-sectional thickness measurements, and Abbott–Firestone curve evaluation. Results show that reducing the flow rate (relative to 100% nominal flow through a 0.4 mm nozzle) to 40% improves surface roughness (Ra) to below 20 m on average across all surfaces, with the lowest Ra of 4.52 ± 0.49 m observed at a 20% flow rate on the top surfaces enclosing the cavity. The intralayer bonding between adjacent extruded lines increases up to 70%, improving deposition uniformity. Nozzle-induced smoothing effects enhance surface quality at flow rates of 60% or lower, while higher flow rates result in increased surface waviness and geometric irregularities. These findings enable the fabrication of enclosed microfluidic channels and functional cavities with well-defined surfaces and reduced mechanical stiffness, suitable for applications involving sensing, controlled deformation, or flexible system integration. KW - Fertigungstechnik KW - 3D-Druck Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1016/j.addma.2025.105010 SN - 2214-8604 VL - 113 PB - Elsevier BV ER - TY - CHAP A1 - Döhring, Thorsten A1 - Hudec, Rene T1 - One decade of joint Bavarian-Czech projects on astronomical X-ray optics N2 - Since ten years, Aschaffenburg University of Applied Sciences and the Czech technical university in Prague are now cooperating. During the recent decade, eleven joint projects have been executed, mainly targeting the development of astronomical X-ray optics. The bilateral cooperation also included the exchange of PhD students and scientists, cost compensation for conference participations, and the sponsoring of scientific conferences (AXRO and IBWS). The scientific output up to date are more than twenty joint publications and many individual conference contributions of the project partners in addition. The Bavarian-Czech Academic Agency (BTHA) has funded all of these projects. It is the goal of the Bavarian-Czech Academic Agency to support the academic collaboration in research and education and to contribute to an increased cooperation of the two neighbored countries Bavaria and Czech Republic in general. We will give a review on one decade of our Bavarian-Czech cooperation and on the scientific results of our joint projects on astronomical X-ray optics. KW - X-ray KW - optics KW - astronomy KW - AXRO KW - IBWS KW - Röntgenoptik KW - Röntgenastronomie KW - Bayern KW - Tschechien Y1 - 2025 VL - 2025 IS - 16 SP - 1 EP - 1 PB - 16th International Conference on Astronomical X-ray Optics CY - Prag ER - TY - CHAP A1 - Busch, Uwe A1 - Michels, Marcel A1 - Kätker, Anna A1 - Döhring, Thorsten A1 - Stanik, Eva T1 - Historical X ray images selected for UNESCO's Memory of the World Register N2 - The Deutsches Röntgen Museum” in Remscheid (Germany) is the institution that uniquely and comprehensively explores and documents the life and work of Wilhelm Conrad Röntgen and the impact of his discovery. It preserves a collection of X- ray images taken by W. C. Röntgen during his research. Among them are three images of Röntgen's own hands and those of his wife, Anna Bertha. Three more images show Röntgen's hunting rifle, which he was able to analyze internally by using the new X ray technology. These two series of historical pictures from the years 1895 and 1896 provide an outstanding illustration of the scientific revolution that Röntgen's discovery triggered especially in medicine and in materials science. Therefore, his discovery of X-rays ranks among the most groundbreaking scientific achievements of modern times. In April 2025 those very first recorded X ray photographs were added on the UNESCO Memory of the World Register. The corresponding public ceremony took place on September 10 2025 in Röntgen ´ s birth town Remscheid. Representatives of the German UNESCO Commission, of politics, and of the German Röntgen Society were present UNESCO is thus honoring not only Röntgen's groundbreaking discovery of X rays, but also the cultural, scientific, and technological implications of his early radiographs. The "Deutsches Röntgen Museum" presents six famous historical X-ray documents to the public, which are now part of UNESCO ´ s Memory of the World Register. KW - Wilhelm Conrad Röntgen KW - UNESCO KW - X-rays KW - Nobel Prize KW - museum KW - Deutsches Röntgen-Museum KW - Röntgenbild Y1 - 2025 VL - 16 SP - 1 EP - 1 PB - 16th International Conference on Astronomical X-ray Optics CY - Prag ER - TY - INPR A1 - Alves, Caroline A1 - Paulo, Artur José Marques A1 - de Faria, Danilo Donizete A1 - Sato, João Ricardo A1 - Borges, Vanderci A1 - Silva, Sonia de Azevedo A1 - Ferraz, Henrique Ballalai A1 - Rodrigues, Francisco A. A1 - Thielemann, Christiane A1 - Moeckel, Michael A1 - Aguiar, Patricia de Carvalho T1 - Decoding Dystonia: unveiling neural patterns with interpretable EEG-Based Machine Learning N2 - Dystonia has a multifaceted and complex pathogenesis. Current diagnostic proce-dures, which focus primarily on clinical signs, may lack accuracy due to the variable presentationsof different dystonia types. There is a need for objective, interpretable, and non-invasive diagnostictools. This study aims to develop an interpretable electroencephalography (EEG)-basedmachine learning (ML) and deep learning (DL) approach to distinguish between focal upper limbdystonia (ULD), cervical dystonia (CD), and healthy controls (HC). EEG data were recorded during resting-state, writing-from-memory, and finger-tapping tasks. The EEG signals were segmented into windows to generate connectivity matricesusing various pairwise correlation metrics. Machine learning models were trained to classify thegroups, with performance evaluated using accuracy and area under the curve (AUC) metrics. Our approach achieved accuracy and AUC scores close to 100%. Transfer entropyemerged as the most effective connectivity metric, revealing altered brain connections in dystonia.Complex network measures outperformed traditional EEG features, highlighting the relevance offunctional connectivity. Resting-state EEG showed the highest classification performance for ULD,suggesting strong diagnostic potential. Conclusions: This study provides the first machine learning-based comparison between differenttypes of dystonia, introduces novel cervical dystonia EEG data, and yields medically interpretableinsights into altered brain connectivity. The findings enhance our understanding of dystonia and support using EEG as alow-cost, interpretable tool for diagnosing and developing brain-machine interfaces. KW - Dystonie KW - Elektroencephalographie KW - Maschinelles Lernen Y1 - 2025 U6 - https://doi.org/https://doi.org/10.21203/rs.3.rs-7483388/v1 PB - Springer Science and Business Media LLC ER - TY - JOUR A1 - Cotroneo, Vicenzo A1 - Basso, Stefano A1 - Civitani, Marta A1 - Döhring, Thorsten A1 - Gibertini, Eugenio A1 - Iovenitti, Simone A1 - Magagnin, Luca A1 - Pareschi, Giovanni A1 - Sironi, Giorgia A1 - Spiga, Daniele A1 - Tagliaferri, Gianpiero A1 - Valsecchi, Giuseppe T1 - Polydopamine Coatings for Enhanced Soft X-Ray Reflectivity in Space Telescope Mirrors JF - ECS Meeting Abstracts N2 - It has been known for years that sputtered low-density coatings deposited under vacuum (e.g. carbon or B4C), applied on top of high-density metallic coatings, can enhance their reflectivity in the soft X-ray band (below ~5 keV). However, the physical deposition techniques, as vacuum-based sputtering, to produce B4C or amorphous coatings are usually difficult and highly costing. Polydopamine (PDA), a bio-polymer inspired by mussels, exhibits exceptional surface binding and it’s nowadays a popular material used in surface engineering for multipurpose applications (Ryu, 2018). PDA thin film are typically produced in aqueous solution by the oxidative polymerization of dopamine, commonly known as one of the “hormones of happiness”, resulting in nanometric PDA coating with tunable thickness and morphology. In recent years, we have introduced and investigated a novel and scalable strategy for enhancing the soft X-ray reflectivity of telescope mirrors used in space missions based on dip-liquid deposition of PDA thin films as carbon-rich coating (carbon 62.7 %wt. in DA monomer) (Cotroneo, 2022). This method is very versatile and quick and offers a low-cost alternative to conventional carbon-like coating, while maintaining or even exceeding performance in the energy range below ~5 keV. Experimental tests across three X-ray beamlines—including two synchrotron facilities—demonstrated consistent reflectivity enhancement, especially in the 1–4 keV energy range and with a good match between theoretical predictions and experimental reflectivity profiles. When applied over traditional coatings (e.g Au, Ir), the dip-liquid overcoats produced improvements of up to 100% in effective area for some specific X-ray bands compared to conventional single-metal films. These results are particularly compelling for nickel-replicated mirrors with gold coatings, a common architecture in cost-sensitive space missions. Bibliography Cotroneo, V., 2022. Dopamine dip-liquid overcoatings for soft x-ray reflectivity enhancement. SPIE Proceedings. Ryu, J. H., 2018. Polydopamine Surface Chemistry: A Decade of Discovery. ACS Applied Materials & Interfaces. KW - Röntgenteleskop KW - Röntgenspiegel Y1 - 2025 U6 - https://doi.org/10.1149/MA2025-02673247mtgabs SN - 2151-2043 VL - MA2025-02 IS - 67 SP - 3247 EP - 3247 PB - The Electrochemical Society ER - TY - JOUR A1 - Kern, Marcel A1 - Ohly, Sandra A1 - Ďuranová, Lenka A1 - Friedrichs, Juliane T1 - Drowning in emails: Investigating email classes and work stressors as antecedents of high email load and implications for well-being JF - Frontiers in Psychology N2 - Introduction: High email load has been associated with impaired well-being because emails impose specific demands, disturb the workflow, and thereby overtax individuals’ action regulation toward prioritized goals. However, the causes and well-being-related consequences of email load are not yet well understood, as previous studies have neglected the interaction type and function of emails as well as co-occurring stressors as antecedents of high email load and have relied predominantly on cross-sectional designs. Methods: In two studies, we aimed to clarify the nature of email load through the lens of action regulation theory. The first study, a two-wave investigation with a fortnightly interval, examined the lagged relationships among email load, work stressors, strain, and affective well-being. The sample included 444 individuals across various occupations and organizations, with 196 of them working from home or remotely at least part of the time. In the second cross-sectional study, we surveyed 257 individuals using a convenience sampling approach, 108 of whom worked from home or remotely at least partially. This study focused on evaluating how different email classes—distinguished by email interaction type (received vs. processed) and email function (communication vs. task)—serve as predictors of high email load. Results: In Study 1, we found a positive lagged effect of high email load on strain, even when controlling for the co-occurring stressors time pressure and work interruptions. In addition, lagged effects of email load on time pressure and interruptions were identified, while no evidence was found for the reverse direction. The results of Study 2 suggest that only the number of communication-related emails received, but not the number of task-related emails received, or the number of all emails processed contribute to high email load. Conclusion: Findings suggest that email load can be considered a unique stressor and that different classes of email need to be distinguished to understand its nature. Clarifying the sources of email load can help develop effective strategies to address it. KW - email, email demands, email load, action regulation theory, cross-lagged panel, well-being KW - E-Mail KW - Kommunikation KW - Bürokommunikation KW - Stressbewältigung KW - Zeiteinteilung Y1 - 2024 U6 - https://doi.org/10.3389/fpsyg.2024.1439070 SN - 1664-1078 VL - 15 ER - TY - CHAP A1 - Hudec, Rene A1 - Döhring, Thorsten T1 - Astrophysical and scientific payloads for CubeSats T2 - 18th Pico- and Nanosatellite Workshop 2025, Abstracts Book N2 - For scientific and commercial applications, CubeSats enable cost-effective missions and significantly reduce the time between mission concept and launch compared to classical large satellites. Since 2000, there has been an accelerating increase in CubeSat launches, which in turn is expected to drive up the demand for dedicated optical instruments, especially in commercially relevant areas like high-resolution optics for earth observation. We present some studies and ideas of application of CubeSats mainly in the field of astronomy and astrophysics elaborated and studied at the Czech Technical University in Prague in collaboration with Aschaffenburg University of Applied Sciences. These includes single CubeSats as well as tandem CubeSat constellations. These miniature satellites can carry miniature scientific payloads for high-energy observations of both astrophysical objects as well as targets in high earth atmosphere. The examples include miniature X-ray and UV telescopes monitors and cameras, but also optical and NIR payloads. 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 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. The tandem flight arrangements are crucial for design of space telescopes with larger focal distances exceeding the typical sizes of small satellites. KW - satellite KW - CubeSat KW - payload KW - tandem flight KW - Kleinsatellit Y1 - 2025 VL - 2025 SP - 12 EP - 12 PB - Julius-Maximilians-Universität Würzburg CY - Würzburg ER - TY - CHAP A1 - Döhring, Thorsten A1 - Krivanekova, Lucia A1 - Hildenbrand, Georg T1 - ASTRABAX – Scientific results of two stratospheric balloon flights T2 - 18th Pico- and Nanosatellite Workshop 2025, Abstracts Book N2 - The ASTRABAX experiment ("Aschaffenburg Stratospheric Balloon Experiment") uses a multimodal platform to study radiation exposures in the upper atmosphere. We present a modular approach to accommodate the numerous setups under the weight restriction of light unmanned free stratospheric balloon. The compartmental setup allows flexibility to address current research questions with low expenditure in costs, manpower and technology expertise. Its easy implementation is suitable for educational purposes of students in the fields of astronomy, astrobiology, and material research. Recently, two stratospheric balloons were flown to test the feasibility and connectivity of different building blocks in a temperature-controlled gondola, and to characterize the stratospheric radiation environment.The focus of the physical experiments is the observation of the UV-C spectral region using miniature UV-VIS spectrometers, and cosmic ray dosimetry with a Geiger counter. A second set of experiments assesses the effects of irradiation on polydopamine coatings intended for the application in space-born X-ray telescopes. The platform also contains samples of biological cells that are simultaneously exposed to low-dose radiation of different compositions of particle, X-ray and UV radiation. Post-flight nanoscopic measurements aim to examine changes in the spatial chromatin organization playing a crucial role in DNA-repair mechanisms. Investigations in such natural environment are of importance for high altitude atmospheric as well as space flights, for comparable exposures on other objects of the solar system and for astrobiology. KW - cosmic ray KW - radiation KW - stratospheric balloon KW - atmosphere KW - UVC KW - Stratosphären-Ballon KW - Kosmische Strahlung KW - Röntgenspiegel Y1 - 2025 VL - 2025 SP - 17 EP - 17 PB - Julius-Maximilians-Universität Würzburg CY - Würzburg ER - TY - CHAP A1 - Touboulic, Anne A1 - McCarthy, Lucy A1 - Sannö, Anna A1 - Reuter, Carsten T1 - Action research for supply chain management: reflections and practical guide T2 - Handbook of Research Methods for Supply Chain Management KW - Supply Chain Management Y1 - 2022 SN - 9781788975865 U6 - https://doi.org/10.4337/9781788975865.00014 SP - 149 EP - 168 PB - Edward Elgar Publishing ER - TY - CHAP A1 - Stanik, Eva A1 - Döhring, Thorsten A1 - Rees, Paul A1 - Kroneberger, Monika A1 - Stanik, Martin T1 - Infrared heating for a sustainable powder coating technology T2 - DGaO-Proceedings N2 - Industrial processes need to be transformed into sustainable alternatives. For powder coatings, which traditionally rely on gas or oil heating systems, infrared radiation can deliver the required process heat. The aim of the NAPUBEST project is to evaluate the possibilities of infrared radiation in the powder coating process. In our laboratory, we realized a prototype of an IR oven for test measurements. KW - infrared KW - powder coating KW - sustainability KW - curing Y1 - 2025 UR - https://www.dgao-proceedings.de/download/126/126_p24.pdf SN - 1614-8436 VL - 2025 IS - 126 SP - 1 EP - 2 PB - DGaO ER - TY - CHAP A1 - Hudec, Rene A1 - Stieglitz, Veronika A1 - Döhring, Thorsten A1 - Friedrich, Peter A1 - Burwitz, Vadim T1 - Novel X-ray optics developed within the AHEAD2020 project T2 - DGaO-Proceedings N2 - We present a summary of our contribution to the EU Horizon 2020 project AHEAD2020, with emphasis on the X-ray optics work package. The Czech Technical University – together with other collaborating institutes – studied innovative Lobster Eye and Kirkpatrick-Baez X-ray modules, based on the Multi Foil Optics technology. In addition, a student’s workshop in December 2023 and a summer school in May 2024 were organized within the project. KW - X-ray KW - optics KW - telescope KW - Lobster Eye KW - mirror KW - Röntgenoptik Y1 - 2025 UR - https://www.dgao-proceedings.de/download/126/126_p5.pdf SN - 1614-8436 VL - 2025 IS - 126 SP - 1 EP - 2 PB - DGaO ER - TY - JOUR A1 - Kroneberger, Monika A1 - Stanik, Eva A1 - Döhring, Thorsten ED - El Gawhary, O. ED - Witte, S. ED - Moreno, I. T1 - Parameter optimization for the infrared curing process of powder coatings using the NAPUBEST prototype and optical simulations JF - EPJ Web of Conferences N2 - In line with the energy transition, it is desirable to replace fossil fuels in the curing process of industrial powder coatings. Infrared heating is the considered method here. IR-emitter arrangement in the reflective heating chamber, their geometry and the dwell time of the components are crucial for a successful and efficient process. Process optimization has to consider the optical parameter variation of the powder coating during the procedure. Measurements in the NAPUBEST prototype are compared with optical simulations of the setup to get the simulation parameters in agreement with reality and to provide a foundation for the layout of industrial processes. KW - infrared KW - powder coating KW - sustainability KW - optic design KW - curing KW - Pulverlack KW - Aushärtung KW - Infrarot Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1051/epjconf/202533503035 SN - 2100-014X VL - 335 SP - 1 EP - 2 PB - EDP Sciences ER - TY - CHAP A1 - Weithmann, Sabrina T1 - The Modernization of the Chinese Standardization System T2 - Standardization Strategies in China and India N2 - Since the founding of the People’s Republic in 1949, China’s standardization system has undergone continuous change. However, with the opening up of the economy and the growing importance of international trade, a more comprehensive modernization of the Chinese standardization system became inevitable. After initial attempts to renew the standardization system showed little success, China has been pursuing a more holistic approach since 2015 as part of its reform plans for the standardization system. An approach that meets the needs and expectations of a leading economic power in a global market. Compared to other leading standardization powers such as Europe or the USA, China is considered a latecomer to international standardization. However, this has offered the advantage that China can learn from the experience of other nations and build a standardization system that incorporates the best aspects of other systems while simultaneously meeting China’s claim to economic leadership. KW - Normung KW - Standardization KW - China KW - China KW - Indien KW - Industriepolitik KW - Standardisierung Y1 - 2024 SN - 9783658455828 U6 - https://doi.org/https://doi.org/10.1007/978-3-658-45583-5_7 SN - 2731-9776 VL - 2024 SP - 123 EP - 131 PB - Springer Fachmedien Wiesbaden CY - Wiesbaden ER - TY - JOUR A1 - Schickel, Esther A1 - Bender, Tamara A1 - Kaysan, Leon A1 - Hufgard, Simone A1 - Mayer, Margot A1 - Grosshans, David R. A1 - Thielemann, Christiane A1 - Schroeder, Insa S. T1 - Human cerebral organoids model tumor initiation and infiltration in an autologous astrocyte-supported setting JF - iScience N2 - Efforts to efficiently target brain tumors are constrained by the dearth of appropriate models to study tumor behavior towards treatment approaches as well as potential side effects to the surrounding normal tissue. We established a reproducible cerebral organoid model of brain tumorigenesis in an autologous setting by overexpressing c-MYC, a common oncogene in brain tumors. GFP+/c-MYChigh cells were isolated from tumor organoids and used in two different approaches: GFP+/c-MYChigh cells co-cultured with cerebral organoid slices or fused as spheres to whole organoids. GFP+/c-MYChigh cells used in both approaches exhibited tumor-like properties, including an immature phenotype and a highly proliferative and invasive potential. We demonstrate that the latter is influenced by astrocytes supporting the GFP+/c-MYChigh cells while X-ray irradiation significantly kills and impairs tissue infiltration of GFP+/c-MYChigh cells. In summary, the model represents major features of tumorous and adjacent normal tissue and may be used to evaluate appropriate cancer treatments. KW - Hirntumor Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1016/j.isci.2025.113334 SN - 2589-0042 PB - Elsevier BV ER - TY - JOUR A1 - Hölter, Jan A1 - Rickmeyer, Tim A1 - Thielemann, Christiane T1 - CellRex: Software platform for managing biological cell data JF - SoftwareX N2 - This work introduces the software platform CellRex, a research data management system for laboratories capable of storing, searching, and enriching data with biological metadata. CellRex addresses data management challenges by storing data in an ontology-based directory structure within the filesystem, with metadata saved as JSON files and in a document-oriented SQLite database. The framework, deployed as container services in a software-as-a-service model, features a web-based GUI and API for user interaction and machine-readable access, providing functionalities such as duplicate detection, experiment grouping, and templating. CellRex improves research efficiency and facilitates data reuse, providing a targeted solution for laboratories focused on cell analysis research. KW - Forschungsdaten KW - Zytologie Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1016/j.softx.2025.102284 SN - 2352-7110 VL - 31 PB - Elsevier BV ER - TY - CHAP A1 - Schneegans, Jan A1 - Eilbrecht, Jan A1 - Zernetsch, Stefan A1 - Bieshaar, Maarten A1 - Doll, Konrad A1 - Stursberg, Olaf A1 - Sick, Bernhard T1 - Probabilistic VRU Trajectory Forecasting for Model-Predictive Planning A Case Study: Overtaking Cyclists T2 - 2021 IEEE Intelligent Vehicles Symposium Workshops (IV Workshops) KW - Fahrerassistenzsystem KW - Radfahrer KW - Autonomes Fahrzeug Y1 - 2021 U6 - https://doi.org/10.1109/IVWorkshops54471.2021.9669208 SP - 272 EP - 279 PB - IEEE ER - TY - CHAP A1 - Zernetsch, Stefan A1 - Trupp, Oliver A1 - Kress, Viktor A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Cyclist Trajectory Forecasts by Incorporation of Multi-View Video Information T2 - 2021 IEEE International Smart Cities Conference (ISC2) KW - Autonomes Fahrzeug KW - Radfahrer Y1 - 2021 U6 - https://doi.org/10.1109/ISC253183.2021.9562857 SP - 1 EP - 7 PB - IEEE ER - TY - JOUR A1 - Kress, Viktor A1 - Jeske, Fabian A1 - Zernetsch, Stefan A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Pose and Semantic Map Based Probabilistic Forecast of Vulnerable Road Users’ Trajectories JF - IEEE Transactions on Intelligent Vehicles KW - Fahrerassistenzsystem KW - Autonomes Fahrzeug Y1 - 2023 U6 - https://doi.org/10.1109/TIV.2022.3149624 SN - 2379-8904 VL - 8 IS - 3 SP - 2592 EP - 2603 PB - Institute of Electrical and Electronics Engineers (IEEE) ER - TY - CHAP A1 - Bieshaar, Maarten A1 - Zernetsch, Stefan A1 - Riepe, Katharina A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Cyclist Motion State Forecasting - Going beyond Detection T2 - 2021 IEEE Symposium Series on Computational Intelligence (SSCI) KW - Autonomes Fahrzeug KW - Radfahrer Y1 - 2021 U6 - https://doi.org/10.1109/SSCI50451.2021.9660151 SP - 1 EP - 8 PB - IEEE ER - TY - CHAP A1 - Link, Renate T1 - Icelandic Identity: From a X-Nordic Elective to a Cultural Game T2 - Nordic Intercultural Communication Conference am Vigdís Institute der University of Iceland/Reykjavik/Island, 24.11.-26.11.2022 KW - Island KW - Nationalbewusstsein Y1 - 2022 ER - TY - CHAP A1 - Link, Renate T1 - A Comparative Analysis of Students' Perceptions of Female Empowerment and Gender Roles: Perspectives from German, Japanese, and Taiwanese Students T2 - SIETAR Japan Virtual Conference, 26.11.-27.11.2022 (Co-Referentinnen: Eriko Katsumata, Aoyama Gakuin University/Japan & Siao-cing Guo, National Taipei University of Business/Taiwan) KW - Student KW - Studentin KW - Geschlechterrolle Y1 - 2022 ER - TY - GEN A1 - Link, Renate A1 - Konomi, Natalie T1 - Intercultural Aspects of Summer Schools and Short-Term Programmes - A Comprehensive Analysis T2 - IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023 N2 - Poster KW - Interkulturelles Verstehen KW - Sommerkurs Y1 - 2023 ER - TY - GEN A1 - Link, Renate A1 - Latchiah, Nicola T1 - A Contrastive Analysis of Academic and Campus Cultures in Germany and Japan T2 - IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023 N2 - Poster KW - Deutschland KW - Japan KW - Hochschule KW - Vielfalt Y1 - 2023 ER - TY - CHAP A1 - Hetzel, Manuel T1 - Intention Detection Using Environmental Context and Enhanced Training Data for Vulnerable Road Users T2 - Organic Computing - Doctoral Dissertation Colloquium 2022 KW - Fahrerassistenzsystem KW - Verkehrsteilnehmer KW - Verkehrsverhalten Y1 - 2023 VL - 2023 PB - Kassel University Press CY - Kassel ER - TY - CHAP A1 - Hubert, Andreas A1 - Jung, Janis A1 - Doll, Konrad T1 - Exploiting Self-Imposed Constraints on RGB and LiDAR for Unsupervised Training T2 - Proceedings of the 2023 6th International Conference on Machine Vision and Applications N2 - Hand detection on single images is an intensively researched area, and reasonable solutions are already available today. However, fine-tuning detectors within a specific domain remains a tedious task. Unsupervised training procedures can reduce the effort required to create domain-specific datasets and models. In addition, different modalities of the same physical space, here color and depth data, represent objects differently and thus allow for exploitation. We introduce and evaluate a training pipeline to exploit the modalities in an unsupervised manner. The supervision is omitted by choosing suitable self-imposed constraints for the data source. We compare our training results with ground truth training results and show that with these modalities, the domain can be extended without a single annotation, e.g., for detecting colored gloves. KW - Maschinelles Sehen Y1 - 2023 U6 - https://doi.org/https://doi.org/10.1145/3589572.3589575 SP - 15 EP - 21 PB - ACM CY - New York, NY, USA ER - TY - JOUR A1 - Mehrjoo, Masoud A1 - Pacuraru, Alexander A1 - Krüger, Luise A1 - Beck, Florian A1 - Doll, Konrad A1 - Arba Mosquera, Samuel T1 - Peri-operative intrastromal corneal segmentation after creation of corneal cuts based on laser induced optical breakdown: A perspective study JF - Journal of the European Optical Society-Rapid Publications N2 - Refractive correction techniques, such as Lenticule Extraction and LASIK, are pivotal in corneal surgery. Precise morphological characterization is essential for identifying post-operative complications, which can be compromised by image noise and low contrast. This study introduces an automated image processing algorithm that integrates non-local denoising, the Sobel gradient method, and Bayesian optimization to accurately delineate lenticule volumes and flap surfaces. Validated on 60 ex vivo porcine eyes treated with the SCHWIND ATOS femtosecond laser, the algorithm demonstrated high accuracy compared to the manual gold standard while effectively reducing variability. KW - Hornhautchirurgie KW - Bildverarbeitung Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1051/jeos/2025006 SN - 1990-2573 VL - 21 IS - 1 PB - EDP Sciences ER - TY - CHAP A1 - Hetzel, Manuel A1 - Reichert, Hannes A1 - Doll, Konrad A1 - Sick, Bernhard T1 - Reliable Probabilistic Human Trajectory Prediction for Autonomous Applications T2 - Computer Vision – ECCV 2024 Workshops, Milan, Italy, September 29–October 4, 2024, Proceedings, Part XVII KW - Autonomes System KW - Mensch-Maschine-Kommunikation Y1 - 2025 SN - 9783031915840 U6 - https://doi.org/https://doi.org/10.1007/978-3-031-91585-7_9 SN - 0302-9743 SP - 135 EP - 152 PB - Springer Nature CY - Cham ER -