@article{WolpertReuter2012, author = {Wolpert, Stefan and Reuter, Carsten}, title = {Status Quo of City Logistics in Scientific Literature}, series = {Transportation Research Record: Journal of the Transportation Research Board}, volume = {2269}, journal = {Transportation Research Record: Journal of the Transportation Research Board}, number = {1}, publisher = {SAGE Publications}, issn = {0361-1981}, doi = {10.3141/2269-13}, pages = {110 -- 116}, year = {2012}, abstract = {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.}, subject = {Stadtentwicklung}, language = {en} } @article{GoebelReuterPiberniketal.2018, author = {Goebel, Philipp and Reuter, Carsten and Pibernik, Richard and Sichtmann, Christina and Bals, Lydia}, title = {Purchasing managers' willingness to pay for attributes that constitute sustainability}, series = {Journal of Operations Management}, volume = {62}, journal = {Journal of Operations Management}, number = {1}, publisher = {Wiley}, issn = {0272-6963}, doi = {10.1016/j.jom.2018.08.002}, pages = {44 -- 58}, year = {2018}, abstract = {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.}, subject = {Einkauf}, language = {en} } @inproceedings{HubertGuoDolletal.2025, author = {Hubert, Andreas and Guo, Chenxi and Doll, Konrad and Sick, Bernhard}, title = {Improving Fast 6D Pose Estimation with Adaptive Model Fusion}, series = {2025 5th International Conference on Machine Learning and Intelligent Systems Engineering (MLISE)}, booktitle = {2025 5th International Conference on Machine Learning and Intelligent Systems Engineering (MLISE)}, publisher = {IEEE}, doi = {https://doi.org/10.1109/MLISE66443.2025.11100239}, pages = {58 -- 63}, year = {2025}, subject = {Maschinelles Lernen}, language = {en} } @inproceedings{SerflingReichertBayerleinetal.2025, author = {Serfling, Benjamin and Reichert, Hannes and Bayerlein, Lorenzo and Doll, Konrad and Radkhah-Lens, Kati}, title = {LiDAR Based Semantic Perception for Forklifts in Outdoor Environments}, series = {2025 IEEE International Conference on Service Operations and Logistics, and Informatics (SOLI)}, booktitle = {2025 IEEE International Conference on Service Operations and Logistics, and Informatics (SOLI)}, publisher = {IEEE}, doi = {https://doi.org/10.1109/SOLI66289.2025.11396313}, pages = {40 -- 45}, year = {2025}, subject = {Gabelstapler}, language = {en} } @inproceedings{HockHaugAbke2025, author = {Hock, Isabell and Haug, Jim and Abke, J{\"o}rg}, title = {DIDACTIC INTEGRATION OF SELF-STUDY AND FACE-TO-FACE TEACHING: EXPERIENCES WITH AN ADAPTIVE LEARNING SYSTEM IN ENGINEERING EDUCATION}, series = {ICERI Proceedings}, volume = {1}, booktitle = {ICERI Proceedings}, publisher = {IATED}, isbn = {978-84-09-78706-7}, issn = {2340-1095}, doi = {https://doi.org/10.21125/iceri.2025.1600}, pages = {5825 -- 5829}, year = {2025}, abstract = {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-gest{\"u}tzt, 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.}, subject = {E-Learning}, language = {en} } @inproceedings{SchoppelHaugManzetal.2025, author = {Schoppel, Paul and Haug, Jim and Manz, Julian and Bigler, Dimitri and Hock, Isabell and Abke, J{\"o}rg and Hagel, Georg}, title = {METHODICAL APPROACH FOR ANALYZING LEARNING PATH FITNESS IN AN AI-BASED ADAPTIVE LEARNING SYSTEM}, series = {EDULEARN Proceedings}, volume = {1}, booktitle = {EDULEARN Proceedings}, publisher = {IATED}, isbn = {978-84-09-74218-9}, issn = {2340-1117}, doi = {https://doi.org/10.21125/edulearn.2025.2430}, pages = {9438 -- 9446}, year = {2025}, abstract = {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.}, subject = {E-Learning}, language = {en} } @inproceedings{FischerHaugSchoppeletal.2025, author = {Fischer, David Vincent and Haug, Jim and Schoppel, Paul and Abke, J{\"o}rg and Becker, Matthias and Hagel, Georg}, title = {Evaluation of a Node-based Automatic Short Answer Tool "NodeGrade"}, series = {Proceedings of the 6th European Conference on Software Engineering Education}, booktitle = {Proceedings of the 6th European Conference on Software Engineering Education}, publisher = {ACM}, address = {New York, NY, USA}, doi = {https://dl.acm.org/doi/10.1145/3723010.3723021}, pages = {20 -- 29}, year = {2025}, abstract = {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.}, subject = {Software Engineering}, language = {en} } @inproceedings{ChaarRaiynWeidl2025, author = {Chaar, Mohamad Mofeed and Raiyn, Jamal and Weidl, Galia}, title = {Predicting Depth Maps from Single RGB Images and Addressing Missing Information in Depth Estimation}, series = {Proceedings of the 11th International Conference on Vehicle Technology and Intelligent Transport Systems}, booktitle = {Proceedings of the 11th International Conference on Vehicle Technology and Intelligent Transport Systems}, publisher = {SCITEPRESS - Science and Technology Publications}, doi = {10.5220/0013365900003941}, pages = {549 -- 556}, year = {2025}, abstract = {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.}, subject = {Autonomes Fahrzeug}, language = {en} } @inproceedings{TalluriWeidlKasuluru2025, author = {Talluri, Kranthi Kumar and Weidl, Galia and Kasuluru, Vaishnavi}, title = {Accident-Driven Congestion Prediction and Simulation: An Explainable Framework Using Advanced Clustering and Bayesian Networks}, series = {IEEE 102nd Vehicular Technology Conference}, booktitle = {IEEE 102nd Vehicular Technology Conference}, doi = {10.48550/arXiv.2507.22529}, year = {2025}, abstract = {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.}, subject = {Verkehrsstau}, language = {en} } @inproceedings{TalluriStangWeidl2025, author = {Talluri, Kranthi Kumar and Stang, Christopher and Weidl, Galia}, title = {Green Wave as an Integral Part for the Optimization of Traffic Efficiency and Safety: A Survey}, series = {2025 IEEE Intelligent Vehicles Symposium (IV)}, booktitle = {2025 IEEE Intelligent Vehicles Symposium (IV)}, publisher = {IEEE}, doi = {10.1109/IV64158.2025.11097706}, pages = {2422 -- 2429}, year = {2025}, abstract = {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.}, subject = {Verkehrsregelung}, language = {en} } @inproceedings{TalluriMadsenWeidl2025, author = {Talluri, Kranthi Kumar and Madsen, Anders L. and Weidl, Galia}, title = {Enhancing Safety Standards in Automated Systems Using Dynamic Bayesian Networks}, series = {2025 IEEE Intelligent Vehicles Symposium (IV)}, booktitle = {2025 IEEE Intelligent Vehicles Symposium (IV)}, doi = {10.48550/arXiv.2505.02050}, year = {2025}, abstract = {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.}, subject = {Unfallverh{\"u}tung}, language = {en} } @article{SommerPetersEsenetal.2026, author = {Sommer, David and Peters, Maximilian and Esen, Cemal and Hellmann, Ralf}, title = {Enhancing mechanical properties of double-periodic lattice structures using hybrid-additive manufacturing}, series = {The International Journal of Advanced Manufacturing Technology}, volume = {142}, journal = {The International Journal of Advanced Manufacturing Technology}, number = {7-8}, publisher = {Springer Science and Business Media LLC}, issn = {0268-3768}, doi = {https://doi.org/10.1007/s00170-025-17373-y}, pages = {4065 -- 4071}, year = {2026}, abstract = {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.}, subject = {Hochgeschwindigkeitsfr{\"a}sen}, language = {en} } @article{SommerTruetschEsenetal.2025, author = {Sommer, David and Truetsch, Ben and Esen, Cemal and Hellmann, Ralf}, title = {Effect of Hot Isostatic Pressing and Sequenced Heat Treatment on the Mechanical Properties of Hybrid Additive Manufactured Inconel 718 Components}, series = {Journal of Manufacturing and Materials Processing}, volume = {9}, journal = {Journal of Manufacturing and Materials Processing}, number = {11}, publisher = {MDPI AG}, issn = {2504-4494}, doi = {https://doi.org/10.3390/jmmp9110378}, year = {2025}, abstract = {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.}, subject = {Isostatisches Heißpressen}, language = {en} } @article{SommerHornungEsenetal.2025, author = {Sommer, David and Hornung, Simon and Esen, Cemal and Hellmann, Ralf}, title = {In situ high-speed milling and thermal post-processing for the optimization of fatigue behaviour of additive-manufactured IN718 components}, series = {Journal of Materials Research}, volume = {40}, journal = {Journal of Materials Research}, number = {16}, publisher = {Springer Science and Business Media LLC}, issn = {0884-2914}, doi = {https://doi.org/10.1557/s43578-025-01656-x}, pages = {2388 -- 2401}, year = {2025}, abstract = {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.}, subject = {Hochgeschwindigkeitsfr{\"a}sen}, language = {en} } @article{SommerHornungEsenetal.2025, author = {Sommer, David and Hornung, Simon and Esen, Cemal and Hellmann, Ralf}, title = {Evaluation of the Impact of Heat Treatment Processes and Surface Conditions on the Mechanical Properties of PBF-LB/M-Built Inconel 718 Components}, series = {Materials Science Forum}, volume = {1155}, journal = {Materials Science Forum}, publisher = {Trans Tech Publications, Ltd.}, issn = {1662-9752}, doi = {https://doi.org/10.4028/p-9gR9cI}, pages = {11 -- 17}, year = {2025}, abstract = {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.}, subject = {Hochgeschwindigkeitsfr{\"a}sen}, language = {en} } @article{SommerHellmann2025, author = {Sommer, David and Hellmann, Ralf}, title = {On the Impact of Process Parameters and Ambient Temperature on Tensile Strength and Fatigue Behaviour of SLS-Built Polyamide-12}, series = {Key Engineering Materials}, volume = {1019}, journal = {Key Engineering Materials}, publisher = {Trans Tech Publications, Ltd.}, issn = {1662-9795}, doi = {https://doi.org/10.4028/p-F0XrgQ}, pages = {31 -- 36}, year = {2025}, abstract = {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.}, subject = {Selektives Laserstrahlsintern}, language = {en} } @article{SommerHornungEsenetal.2025, author = {Sommer, David and Hornung, Simon and Esen, Cemal and Hellmann, Ralf}, title = {Design Guide for Hybrid-Additive Manufacturing of Inconel 718 Combining PBF-LB/M and In Situ High-Speed Milling}, series = {Journal of Manufacturing and Materials Processing}, volume = {9}, journal = {Journal of Manufacturing and Materials Processing}, number = {3}, publisher = {MDPI AG}, issn = {2504-4494}, doi = {https://doi.org/10.3390/jmmp9030088}, year = {2025}, abstract = {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.}, subject = {Hochgeschwindigkeitsfr{\"a}sen}, language = {en} } @article{SommerTruetschEsenetal.2025, author = {Sommer, David and Truetsch, Ben and Esen, Cemal and Hellmann, Ralf}, title = {Fractographic Analysis and Fatigue Behavior of Additively Manufactured Ni-Superalloy Components with Post Processing Heat Treatment and Hot Isostatic Pressing}, series = {Advanced Engineering Materials}, volume = {27}, journal = {Advanced Engineering Materials}, number = {12}, publisher = {Wiley}, issn = {1438-1656}, doi = {https://doi.org/10.1002/adem.202500078}, year = {2025}, abstract = {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.}, subject = {Nickellegierung}, language = {en} } @article{BischoffEsenHellmann2024, author = {Bischoff, Kay and Esen, Cemal and Hellmann, Ralf}, title = {Femtosecond reductive Laser Sintering under multiple focus conditions for rapid production of conductive copper layers}, series = {Procedia CIRP}, volume = {124}, journal = {Procedia CIRP}, number = {124}, publisher = {Elsevier BV}, issn = {2212-8271}, doi = {10.1016/j.procir.2024.08.189}, pages = {629 -- 633}, year = {2024}, abstract = {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.}, subject = {Laserstrahlsintern}, language = {en} } @inproceedings{FranzSchusterSchwarzetal.2025, author = {Franz, Daniel and Schuster, David and Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Ultrashort pulsed laser drilling of through-glass vias for glass core packaging}, series = {Proceedings of LAMP2025 - the 9th International Congress on Laser Advanced Materials Processing, Ise-City, Japan, June 2025}, booktitle = {Proceedings of LAMP2025 - the 9th International Congress on Laser Advanced Materials Processing, Ise-City, Japan, June 2025}, year = {2025}, subject = {Ultrakurzzeitlaser}, language = {en} } @article{FranzYangEsenetal.2026, author = {Franz, Daniel and Yang, Yongting and Esen, Cemal and Hellmann, Ralf}, title = {Flexible 2D Laser Cutting of Ultra-Thin Glass Using an Ultrashort Pulsed Laser Robotic System}, series = {Journal of Laser Micro/Nanoengineering}, volume = {21}, journal = {Journal of Laser Micro/Nanoengineering}, number = {1}, editor = {Esen, Cemal}, publisher = {Japan Laser Processing Society}, issn = {1880-0688}, doi = {10.2961/jlmn.2026.01.2004}, year = {2026}, subject = {Laserschneiden}, language = {en} } @article{FranzSchusterSchwarzetal.2025, author = {Franz, Daniel and Schuster, David and Schwarz, Simon and Rung, Stefan and Esen, Cemal and Hellmann, Ralf}, title = {Fabrication and analysis of through-glass vias for glass-based electronic packaging using an ultrashort pulsed laser}, series = {Optics and Lasers in Engineering}, volume = {193}, journal = {Optics and Lasers in Engineering}, publisher = {Elsevier BV}, issn = {0143-8166}, doi = {10.1016/j.optlaseng.2025.109106}, year = {2025}, subject = {Ultrakurzzeitlaser}, language = {en} } @inproceedings{ProbstNeumaierHufgardetal.2025, author = {Probst, Anne-Catherine and Neumaier, Marcel and Hufgard, Christopher and W{\"o}lfel, Maximilian and Schmitt, Christoph and Bochtler, Ulrich}, title = {Network Planning a Digital TETRA-Simulcast-System}, series = {Kleinheubacher Tagung, Miltenberg, 23.09.2025 - 25.09.2025}, booktitle = {Kleinheubacher Tagung, Miltenberg, 23.09.2025 - 25.09.2025}, year = {2025}, subject = {TETRA, Telekommunikation}, language = {en} } @article{AltmannSuppeltWuestetal.2025, author = {Altmann, Alexander Anton and Suppelt, Sven and W{\"u}st, Philipp and D{\"o}rsam, Jan Helge and Latsch, Bastian and Flachs, Dennis and Blaeser, Andreas and Zhang, Xiaoqing and Thielemann, Christiane and Seggern, Heinz von and Kupnik, Mario}, title = {Self-supporting mid-air 3D printing of single-layer polypropylene structures: Flow rate-dependent analytical modeling and surface characterization}, series = {Additive Manufacturing}, volume = {113}, journal = {Additive Manufacturing}, publisher = {Elsevier BV}, issn = {2214-8604}, doi = {https://doi.org/10.1016/j.addma.2025.105010}, year = {2025}, abstract = {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.}, subject = {Fertigungstechnik}, language = {en} } @inproceedings{DoehringHudec2025, author = {D{\"o}hring, Thorsten and Hudec, Rene}, title = {One decade of joint Bavarian-Czech projects on astronomical X-ray optics}, volume = {2025}, number = {16}, publisher = {16th International Conference on Astronomical X-ray Optics}, address = {Prag}, organization = {TH Aschaffenburg}, pages = {1 -- 1}, year = {2025}, abstract = {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.}, subject = {R{\"o}ntgenoptik}, language = {en} } @inproceedings{BuschMichelsKaetkeretal.2025, author = {Busch, Uwe and Michels, Marcel and K{\"a}tker, Anna and D{\"o}hring, Thorsten and Stanik, Eva}, title = {Historical X ray images selected for UNESCO's Memory of the World Register}, volume = {16}, publisher = {16th International Conference on Astronomical X-ray Optics}, address = {Prag}, organization = {Deutsches R{\"o}ntgenmuseum Remscheid}, pages = {1 -- 1}, year = {2025}, abstract = {The Deutsches R{\"o}ntgen Museum" in Remscheid (Germany) is the institution that uniquely and comprehensively explores and documents the life and work of Wilhelm Conrad R{\"o}ntgen and the impact of his discovery. It preserves a collection of X- ray images taken by W. C. R{\"o}ntgen during his research. Among them are three images of R{\"o}ntgen's own hands and those of his wife, Anna Bertha. Three more images show R{\"o}ntgen'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 R{\"o}ntgen'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 R{\"o}ntgen ´ s birth town Remscheid. Representatives of the German UNESCO Commission, of politics, and of the German R{\"o}ntgen Society were present UNESCO is thus honoring not only R{\"o}ntgen's groundbreaking discovery of X rays, but also the cultural, scientific, and technological implications of his early radiographs. The "Deutsches R{\"o}ntgen Museum" presents six famous historical X-ray documents to the public, which are now part of UNESCO ´ s Memory of the World Register.}, subject = {Deutsches R{\"o}ntgen-Museum}, language = {en} } @unpublished{AlvesPaulodeFariaetal.2025, author = {Alves, Caroline and Paulo, Artur Jos{\´e} Marques and de Faria, Danilo Donizete and Sato, Jo{\~a}o Ricardo and Borges, Vanderci and Silva, Sonia de Azevedo and Ferraz, Henrique Ballalai and Rodrigues, Francisco A. and Thielemann, Christiane and Moeckel, Michael and Aguiar, Patricia de Carvalho}, title = {Decoding Dystonia: unveiling neural patterns with interpretable EEG-Based Machine Learning}, publisher = {Springer Science and Business Media LLC}, doi = {https://doi.org/10.21203/rs.3.rs-7483388/v1}, year = {2025}, abstract = {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.}, subject = {Dystonie}, language = {en} } @article{CotroneoBassoCivitanietal.2025, author = {Cotroneo, Vicenzo and Basso, Stefano and Civitani, Marta and D{\"o}hring, Thorsten and Gibertini, Eugenio and Iovenitti, Simone and Magagnin, Luca and Pareschi, Giovanni and Sironi, Giorgia and Spiga, Daniele and Tagliaferri, Gianpiero and Valsecchi, Giuseppe}, title = {Polydopamine Coatings for Enhanced Soft X-Ray Reflectivity in Space Telescope Mirrors}, series = {ECS Meeting Abstracts}, volume = {MA2025-02}, journal = {ECS Meeting Abstracts}, number = {67}, publisher = {The Electrochemical Society}, issn = {2151-2043}, doi = {10.1149/MA2025-02673247mtgabs}, pages = {3247 -- 3247}, year = {2025}, abstract = {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.}, subject = {R{\"o}ntgenteleskop}, language = {en} } @article{KernOhlyĎuranovaetal.2024, author = {Kern, Marcel and Ohly, Sandra and Ďuranov{\´a}, Lenka and Friedrichs, Juliane}, title = {Drowning in emails: Investigating email classes and work stressors as antecedents of high email load and implications for well-being}, series = {Frontiers in Psychology}, volume = {15}, journal = {Frontiers in Psychology}, issn = {1664-1078}, doi = {10.3389/fpsyg.2024.1439070}, year = {2024}, abstract = {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.}, subject = {E-Mail}, language = {en} } @inproceedings{HudecDoehring2025, author = {Hudec, Rene and D{\"o}hring, Thorsten}, title = {Astrophysical and scientific payloads for CubeSats}, series = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, volume = {2025}, booktitle = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, publisher = {Julius-Maximilians-Universit{\"a}t W{\"u}rzburg}, address = {W{\"u}rzburg}, organization = {Czech Technical University in Prague}, pages = {12 -- 12}, year = {2025}, abstract = {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.}, subject = {Kleinsatellit}, language = {en} } @inproceedings{DoehringKrivanekovaHildenbrand2025, author = {D{\"o}hring, Thorsten and Krivanekova, Lucia and Hildenbrand, Georg}, title = {ASTRABAX - Scientific results of two stratospheric balloon flights}, series = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, volume = {2025}, booktitle = {18th Pico- and Nanosatellite Workshop 2025, Abstracts Book}, publisher = {Julius-Maximilians-Universit{\"a}t W{\"u}rzburg}, address = {W{\"u}rzburg}, organization = {TH Aschaffenburg}, pages = {17 -- 17}, year = {2025}, abstract = {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.}, subject = {Stratosph{\"a}ren-Ballon}, language = {en} } @incollection{TouboulicMcCarthySannoeetal.2022, author = {Touboulic, Anne and McCarthy, Lucy and Sann{\"o}, Anna and Reuter, Carsten}, title = {Action research for supply chain management: reflections and practical guide}, series = {Handbook of Research Methods for Supply Chain Management}, booktitle = {Handbook of Research Methods for Supply Chain Management}, publisher = {Edward Elgar Publishing}, isbn = {9781788975865}, doi = {10.4337/9781788975865.00014}, pages = {149 -- 168}, year = {2022}, subject = {Supply Chain Management}, language = {en} } @inproceedings{StanikDoehringReesetal.2025, author = {Stanik, Eva and D{\"o}hring, Thorsten and Rees, Paul and Kroneberger, Monika and Stanik, Martin}, title = {Infrared heating for a sustainable powder coating technology}, series = {DGaO-Proceedings}, volume = {2025}, booktitle = {DGaO-Proceedings}, number = {126}, publisher = {DGaO}, organization = {TH Aschaffenburg}, issn = {1614-8436}, pages = {1 -- 2}, year = {2025}, abstract = {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.}, language = {en} } @inproceedings{HudecStieglitzDoehringetal.2025, author = {Hudec, Rene and Stieglitz, Veronika and D{\"o}hring, Thorsten and Friedrich, Peter and Burwitz, Vadim}, title = {Novel X-ray optics developed within the AHEAD2020 project}, series = {DGaO-Proceedings}, volume = {2025}, booktitle = {DGaO-Proceedings}, number = {126}, publisher = {DGaO}, organization = {Czech Technical University in Prague}, issn = {1614-8436}, pages = {1 -- 2}, year = {2025}, abstract = {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.}, subject = {R{\"o}ntgenoptik}, language = {en} } @article{KronebergerStanikDoehring2025, author = {Kroneberger, Monika and Stanik, Eva and D{\"o}hring, Thorsten}, title = {Parameter optimization for the infrared curing process of powder coatings using the NAPUBEST prototype and optical simulations}, series = {EPJ Web of Conferences}, volume = {335}, journal = {EPJ Web of Conferences}, editor = {El Gawhary, O. and Witte, S. and Moreno, I.}, publisher = {EDP Sciences}, issn = {2100-014X}, doi = {https://doi.org/10.1051/epjconf/202533503035}, pages = {1 -- 2}, year = {2025}, abstract = {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.}, subject = {Pulverlack}, language = {en} } @incollection{Weithmann2024, author = {Weithmann, Sabrina}, title = {The Modernization of the Chinese Standardization System}, series = {Standardization Strategies in China and India}, volume = {2024}, booktitle = {Standardization Strategies in China and India}, publisher = {Springer Fachmedien Wiesbaden}, address = {Wiesbaden}, isbn = {9783658455828}, issn = {2731-9776}, doi = {https://doi.org/10.1007/978-3-658-45583-5_7}, pages = {123 -- 131}, year = {2024}, abstract = {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.}, subject = {China}, language = {en} } @article{SchickelBenderKaysanetal.2025, author = {Schickel, Esther and Bender, Tamara and Kaysan, Leon and Hufgard, Simone and Mayer, Margot and Grosshans, David R. and Thielemann, Christiane and Schroeder, Insa S.}, title = {Human cerebral organoids model tumor initiation and infiltration in an autologous astrocyte-supported setting}, series = {iScience}, journal = {iScience}, publisher = {Elsevier BV}, issn = {2589-0042}, doi = {https://doi.org/10.1016/j.isci.2025.113334}, year = {2025}, abstract = {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.}, subject = {Hirntumor}, language = {en} } @article{HoelterRickmeyerThielemann2025, author = {H{\"o}lter, Jan and Rickmeyer, Tim and Thielemann, Christiane}, title = {CellRex: Software platform for managing biological cell data}, series = {SoftwareX}, volume = {31}, journal = {SoftwareX}, publisher = {Elsevier BV}, issn = {2352-7110}, doi = {https://doi.org/10.1016/j.softx.2025.102284}, year = {2025}, abstract = {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.}, subject = {Forschungsdaten}, language = {en} } @inproceedings{SchneegansEilbrechtZernetschetal.2021, author = {Schneegans, Jan and Eilbrecht, Jan and Zernetsch, Stefan and Bieshaar, Maarten and Doll, Konrad and Stursberg, Olaf and Sick, Bernhard}, title = {Probabilistic VRU Trajectory Forecasting for Model-Predictive Planning A Case Study: Overtaking Cyclists}, series = {2021 IEEE Intelligent Vehicles Symposium Workshops (IV Workshops)}, booktitle = {2021 IEEE Intelligent Vehicles Symposium Workshops (IV Workshops)}, publisher = {IEEE}, doi = {10.1109/IVWorkshops54471.2021.9669208}, pages = {272 -- 279}, year = {2021}, subject = {Fahrerassistenzsystem}, language = {en} } @inproceedings{ZernetschTruppKressetal.2021, author = {Zernetsch, Stefan and Trupp, Oliver and Kress, Viktor and Doll, Konrad and Sick, Bernhard}, title = {Cyclist Trajectory Forecasts by Incorporation of Multi-View Video Information}, series = {2021 IEEE International Smart Cities Conference (ISC2)}, booktitle = {2021 IEEE International Smart Cities Conference (ISC2)}, publisher = {IEEE}, doi = {10.1109/ISC253183.2021.9562857}, pages = {1 -- 7}, year = {2021}, subject = {Autonomes Fahrzeug}, language = {en} } @article{KressJeskeZernetschetal.2023, author = {Kress, Viktor and Jeske, Fabian and Zernetsch, Stefan and Doll, Konrad and Sick, Bernhard}, title = {Pose and Semantic Map Based Probabilistic Forecast of Vulnerable Road Users' Trajectories}, series = {IEEE Transactions on Intelligent Vehicles}, volume = {8}, journal = {IEEE Transactions on Intelligent Vehicles}, number = {3}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, issn = {2379-8904}, doi = {10.1109/TIV.2022.3149624}, pages = {2592 -- 2603}, year = {2023}, subject = {Fahrerassistenzsystem}, language = {en} } @inproceedings{BieshaarZernetschRiepeetal.2021, author = {Bieshaar, Maarten and Zernetsch, Stefan and Riepe, Katharina and Doll, Konrad and Sick, Bernhard}, title = {Cyclist Motion State Forecasting - Going beyond Detection}, series = {2021 IEEE Symposium Series on Computational Intelligence (SSCI)}, booktitle = {2021 IEEE Symposium Series on Computational Intelligence (SSCI)}, publisher = {IEEE}, doi = {10.1109/SSCI50451.2021.9660151}, pages = {1 -- 8}, year = {2021}, subject = {Autonomes Fahrzeug}, language = {en} } @inproceedings{Link2022, author = {Link, Renate}, title = {Icelandic Identity: From a X-Nordic Elective to a Cultural Game}, series = {Nordic Intercultural Communication Conference am Vigd{\´i}s Institute der University of Iceland/Reykjavik/Island, 24.11.-26.11.2022}, booktitle = {Nordic Intercultural Communication Conference am Vigd{\´i}s Institute der University of Iceland/Reykjavik/Island, 24.11.-26.11.2022}, year = {2022}, subject = {Island}, language = {en} } @inproceedings{Link2022, author = {Link, Renate}, title = {A Comparative Analysis of Students' Perceptions of Female Empowerment and Gender Roles: Perspectives from German, Japanese, and Taiwanese Students}, series = {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)}, booktitle = {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)}, year = {2022}, subject = {Student}, language = {en} } @misc{LinkKonomi2023, author = {Link, Renate and Konomi, Natalie}, title = {Intercultural Aspects of Summer Schools and Short-Term Programmes - A Comprehensive Analysis}, series = {IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023}, journal = {IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023}, year = {2023}, abstract = {Poster}, subject = {Interkulturelles Verstehen}, language = {en} } @misc{LinkLatchiah2023, author = {Link, Renate and Latchiah, Nicola}, title = {A Contrastive Analysis of Academic and Campus Cultures in Germany and Japan}, series = {IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023}, journal = {IAIR Biennial Conference an der Temple University Philadelphia/USA, 23.07.-27.07.2023}, year = {2023}, abstract = {Poster}, subject = {Deutschland}, language = {en} } @inproceedings{Hetzel2023, author = {Hetzel, Manuel}, title = {Intention Detection Using Environmental Context and Enhanced Training Data for Vulnerable Road Users}, series = {Organic Computing - Doctoral Dissertation Colloquium 2022}, volume = {2023}, booktitle = {Organic Computing - Doctoral Dissertation Colloquium 2022}, publisher = {Kassel University Press}, address = {Kassel}, year = {2023}, subject = {Fahrerassistenzsystem}, language = {en} } @inproceedings{HubertJungDoll2023, author = {Hubert, Andreas and Jung, Janis and Doll, Konrad}, title = {Exploiting Self-Imposed Constraints on RGB and LiDAR for Unsupervised Training}, series = {Proceedings of the 2023 6th International Conference on Machine Vision and Applications}, booktitle = {Proceedings of the 2023 6th International Conference on Machine Vision and Applications}, publisher = {ACM}, address = {New York, NY, USA}, doi = {https://doi.org/10.1145/3589572.3589575}, pages = {15 -- 21}, year = {2023}, abstract = {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.}, subject = {Maschinelles Sehen}, language = {en} } @article{MehrjooPacuraruKruegeretal.2025, author = {Mehrjoo, Masoud and Pacuraru, Alexander and Kr{\"u}ger, Luise and Beck, Florian and Doll, Konrad and Arba Mosquera, Samuel}, title = {Peri-operative intrastromal corneal segmentation after creation of corneal cuts based on laser induced optical breakdown: A perspective study}, series = {Journal of the European Optical Society-Rapid Publications}, volume = {21}, journal = {Journal of the European Optical Society-Rapid Publications}, number = {1}, publisher = {EDP Sciences}, issn = {1990-2573}, doi = {https://doi.org/10.1051/jeos/2025006}, year = {2025}, abstract = {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.}, subject = {Hornhautchirurgie}, language = {en} } @incollection{HetzelReichertDolletal.2025, author = {Hetzel, Manuel and Reichert, Hannes and Doll, Konrad and Sick, Bernhard}, title = {Reliable Probabilistic Human Trajectory Prediction for Autonomous Applications}, series = {Computer Vision - ECCV 2024 Workshops, Milan, Italy, September 29-October 4, 2024, Proceedings, Part XVII}, booktitle = {Computer Vision - ECCV 2024 Workshops, Milan, Italy, September 29-October 4, 2024, Proceedings, Part XVII}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031915840}, issn = {0302-9743}, doi = {https://doi.org/10.1007/978-3-031-91585-7_9}, pages = {135 -- 152}, year = {2025}, subject = {Autonomes System}, language = {en} }