@article{63043,
  abstract     = {{Spatial modes of light have become highly attractive to increase the dimension and, thereby, security and information capacity in quantum key distribution (QKD). So far, only transverse electric field components have been considered, while longitudinal polarization components have remained neglected. Here, we present an approach to include all three spatial dimensions of electric field oscillation in QKD by implementing our tunable, on-a-chip vector beam decoder (VBD). This inversely designed device pioneers the "preparation" and "measurement" of three-dimensionally polarized mutually unbiased basis states for high-dimensional (HD) QKD and paves the way for the integration of HD QKD with spatial modes in multifunctional on-a-chip photonics platforms.}},
  title        = {{{Tunable vector beam decoder by inverse design for high-dimensional quantum key distribution with 3D polarized spatial modes}}},
  doi          = {{10.48550/ARXIV.2304.12296}},
  year         = {{2023}},
}

@article{57556,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Mathematical modelling emphasizes the connection between mathematics and reality — still, tasks are often exclusively introduced inside the classroom. The paper examines the potential of different task settings for mathematical modelling with real objects: outdoors at the real object itself, with photographs and with a 3D model representation. It is the aim of the study to analyze how far the mathematical modelling steps of students solving the tasks differ in comparison to the settings and representations. In a qualitative study, 19 lower secondary school students worked on tasks of all three settings in a Latin square design. Their working processes in the settings are compared with a special focus on the modelling steps Simplifying and Structuring, as well as Mathematizing. The analysis by means of activity diagrams and a qualitative content analysis shows that both steps are particularly relevant when students work with real objects — independent from the three settings. Still, differences in the actual activities could be observed in the students’ discussion on the appropriateness of a model and in dealing with inaccuracies at the real object. In addition, the process of data collection shows different procedures depending on the setting which presents each of them as an enrichment for the acquisition of modelling skills.</jats:p>}},
  author       = {{Jablonski, Simone}},
  issn         = {{0013-1954}},
  journal      = {{Educational Studies in Mathematics}},
  number       = {{2}},
  pages        = {{307--330}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Is it all about the setting? — A comparison of mathematical modelling with real objects and their representation}}},
  doi          = {{10.1007/s10649-023-10215-2}},
  volume       = {{113}},
  year         = {{2023}},
}

@article{57558,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Mathematical modelling emphasizes the connection between mathematics and reality — still, tasks are often exclusively introduced inside the classroom. The paper examines the potential of different task settings for mathematical modelling with real objects: outdoors at the real object itself, with photographs and with a 3D model representation. It is the aim of the study to analyze how far the mathematical modelling steps of students solving the tasks differ in comparison to the settings and representations. In a qualitative study, 19 lower secondary school students worked on tasks of all three settings in a Latin square design. Their working processes in the settings are compared with a special focus on the modelling steps Simplifying and Structuring, as well as Mathematizing. The analysis by means of activity diagrams and a qualitative content analysis shows that both steps are particularly relevant when students work with real objects — independent from the three settings. Still, differences in the actual activities could be observed in the students’ discussion on the appropriateness of a model and in dealing with inaccuracies at the real object. In addition, the process of data collection shows different procedures depending on the setting which presents each of them as an enrichment for the acquisition of modelling skills.</jats:p>}},
  author       = {{Jablonski, Simone}},
  issn         = {{0013-1954}},
  journal      = {{Educational Studies in Mathematics}},
  number       = {{2}},
  pages        = {{307--330}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Is it all about the setting? — A comparison of mathematical modelling with real objects and their representation}}},
  doi          = {{10.1007/s10649-023-10215-2}},
  volume       = {{113}},
  year         = {{2023}},
}

@article{47009,
  abstract     = {{We present a fully integrated radio frequency identifications transponder chip operating at 5.8 GHz, which is compatible with the class-1 generation-2 of the Electronic Product Code protocol (EPC-C1 G2). The tag chip including the analog front-end and the digital baseband processor, are designed in the sub-threshold regime (0.5 V) with a total supply current of less than 50 μA. As a power scavenging unit, a single-stage differential-drive rectifier structure is designed and fabricated with standard threshold voltage (SVT) MOS elements in a commercial 65-nm CMOS process, to provide 0.8 V of rectified voltage. Measurements performed on the fabricated single-stage structure show a maximum power conversion efficiency of 69.6% for a 22 kΩ load and a sensitivity of -12.5 dBm, which corresponds to more than 1 m of reading range. The power conversion efficiency at this range is about 64%.}},
  author       = {{Haddadian, Sanaz and Scheytt, J. Christoph and von Bögel, Gerd and Grenter, Thorben}},
  issn         = {{2469-7281}},
  journal      = {{ IEEE Journal of Radio Frequency Identification}},
  publisher    = {{IEEE}},
  title        = {{{A Sub-Threshold Microwave RFID Tag Chip, Compatible With RFID MIMO Reader Technology}}},
  doi          = {{10.1109/JRFID.2023.3308332}},
  year         = {{2023}},
}

@phdthesis{58680,
  abstract     = {{Heutige On-Board-Ladewandler sind typischerweise aus zwei Stufen aufgebaut, die über einen Spannungszwischenkreis verbunden sind. Als erste Stufe kommt ein PFC-Gleichrichter zum Einsatz, der die Anforderungen an den Netzstrom bezüglich Oberschwingungsgehalt und Leistungsfaktor sicherstellt. Für die zweite Wandler-Stufe hat sich in den vergangenen Jahren ein LLC-Resonanzwandler qualifiziert, der die Ladeleistung an die Traktionsbatterie galvanisch getrennt überträgt. Der Zwischenkreis besteht aus einer Bank von Elektrolytkondensatoren, in denen die pulsierende Eingangsleistung zwischengespeichert wird. Die Kondensatoren machen einen erheblichen Teil des Lader-Volumens aus und altern schnell, was insbesondere für Ladewandler an Bord von Elektrofahrzeugen unerwünscht ist. In der vorliegenden Arbeit wird untersucht, ob diese zweistufige Struktur verworfen werden kann, indem der LLC-Resonanzwandler direkt an die gleichgerichtete Netzspannung angeschlossen wird.Zum Einsatz des LLC-Resonanzwandlers als einstufiger Ladewandler ist die Schaltung für einen großen Strom- und Spannungsbereich auszulegen. Hierfür wird in der vorliegenden Arbeit eine erweiterte Zeitbereichsanalyse erarbeitet, deren hohe Modellierungsgenauigkeit im Anschluss experimentell nachgewiesen wird. Mit Hilfe dieser Zeitbereichsanalyse werden die Belastungsgrößen des Resonanzwandlers berechnet, um hiermit eine Vorauswahl der Schaltungsparameter treffen zu können. Darauf aufbauend erfolgt die Optimierung des integrierten Transformators als Schlüsselkomponente des Ladewandlers sowie dessen prototypische Realisierung. Abschließend wird mittels Prototypen die erzielbare Leistungsdichte ermittelt. Ergebnis: Verglichen mit etablierten Ladewandlern der heutigen Elektrofahrzeuge konnte durch den einstufigen Ansatz die Leistungsdichte um ca. 53% gesteigert werden.}},
  author       = {{Keuck, Lukas}},
  publisher    = {{LibreCat University}},
  title        = {{{Entwurf eines einstufigen Ladewandlers auf Basis eines LLC-Resonanzwandlers}}},
  doi          = {{10.17619/UNIPB/1-1727}},
  year         = {{2023}},
}

@inproceedings{46426,
  abstract     = {{One of the main challenges for next generation automotive radars is the improvement of angular resolution to a sub-degree level. In this context, wide aperture automotive radars of 1m length or more and resolution close to 0.1° in azimuth and 0.5° in elevation could be beneficial. To enable coherent processing of arrays with such large aperture, prior (i.e offline) and online calibration are necessary: channel imbalances (gains and phases) and three dimensional coordinates of transmit and receive elements need to be determined. We propose a calibration strategy based on alternating steps between the two subtasks of i) channel imbalance estimation with ‘known’ array positions, by applying a singular value decomposition to the resulting tensor calculus problem; and ii) antenna position estimation with ’known’ channel imbalances, by numerically maximizing the Bayesian posterior probability; in both cases operating on range/Doppler snapshots of disjoint targets (with potentially unknown locations). Simulation studies based on the parameters of a MIMO 8x6 linear sparse array show promising results as long as the initial position errors do not exceed half a wavelength (2mm), beyond which we observe strong effects of ambiguity. Experimental results with real measurements show that after calibration in laboratory conditions, our MIMO 8x6 demonstrator with 50cm aperture is able to resolve two targets at the same range with angular separation at least as close as 0.4°.}},
  author       = {{Greiff, Christian  and Mateos-Núñez, David and Simoni, Renato and González-Huici, Maria and Kruse, Stephan and Scheytt, J. Christoph and Kolk, Karl and Höller, Christian and Kurz, Heiko Gustav and Meinecke, Marc-Michael and Gisder, Thomas}},
  booktitle    = {{2023 24th International Radar Symposium (IRS)}},
  location     = {{Berlin, Germany}},
  publisher    = {{IEEE}},
  title        = {{{Calibration of Large Coherent MIMO Radar Arrays: Channel Imbalances and 3D Antenna Positions}}},
  doi          = {{10.23919/IRS57608.2023.10172475}},
  year         = {{2023}},
}

@inproceedings{47064,
  author       = {{Iftekhar, Mohammed and Nagaraju, Harshan and Kneuper, Pascal and Sadiye, Babak and Müller, Wolfgang and Scheytt, J. Christoph}},
  booktitle    = {{BCICTS 2023 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium}},
  location     = {{MONTEREY, CALIFORNIA, USA}},
  title        = {{{A 28-Gb/s 27.2 mW NRZ Full-Rate Bang-Bang Clock and Data Recovery in 22 nm FD-SOI CMOS Technology }}},
  year         = {{2023}},
}

@article{60355,
  abstract     = {{<jats:p>We present a method for the generation of higher-order tetrahedral meshes. In contrast to previous methods, the curved tetrahedral elements are guaranteed to be free of degeneracies and inversions while conforming exactly to prescribed piecewise polynomial surfaces, such as domain boundaries or material interfaces. Arbitrary polynomial order is supported. Algorithmically, the polynomial input surfaces are first covered by a single layer of carefully constructed curved elements using a recursive refinement procedure that provably avoids degeneracies and inversions. These tetrahedral elements are designed such that the remaining space is bounded piecewise linearly. In this way, our method effectively reduces the curved meshing problem to the classical problem of linear mesh generation (for the remaining space).</jats:p>}},
  author       = {{Khanteimouri, Payam and Campen, Marcel}},
  issn         = {{0730-0301}},
  journal      = {{ACM Transactions on Graphics}},
  number       = {{6}},
  pages        = {{1--19}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{3D Bézier Guarding: Boundary-Conforming Curved Tetrahedral Meshing}}},
  doi          = {{10.1145/3618332}},
  volume       = {{42}},
  year         = {{2023}},
}

@article{60354,
  abstract     = {{<jats:p>We present a set of operators to perform modifications, in particular collapses and splits, in volumetric cell complexes which are discretely embedded in a background mesh. Topological integrity and geometric embedding validity are carefully maintained. We apply these operators strategically to volumetric block decompositions, so-called T-meshes or base complexes, in the context of hexahedral mesh generation. This allows circumventing the expensive and unreliable global volumetric remapping step in the versatile meshing pipeline based on 3D integer-grid maps. In essence, we reduce this step to simpler local cube mapping problems, for which reliable solutions are available. As a consequence, the robustness of the mesh generation process is increased, especially when targeting coarse or block-structured hexahedral meshes. We furthermore extend this pipeline to support feature alignment constraints, and systematically respect these throughout, enabling the generation of meshes that align to points, curves, and surfaces of special interest, whether on the boundary or in the interior of the domain.</jats:p>}},
  author       = {{Brückler, Hendrik and Campen, Marcel}},
  issn         = {{0730-0301}},
  journal      = {{ACM Transactions on Graphics}},
  number       = {{6}},
  pages        = {{1--24}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{Collapsing Embedded Cell Complexes for Safer Hexahedral Meshing}}},
  doi          = {{10.1145/3618384}},
  volume       = {{42}},
  year         = {{2023}},
}

@article{60335,
  abstract     = {{<jats:p>A method is presented to compute volumetric maps and parametrizations of objects over 3D domains. As a key feature, continuity and bijectivity are ensured by construction. Arbitrary objects of ball topology, represented as tetrahedral meshes, are supported. Arbitrary convex as well as star-shaped domains are supported. Full control over the boundary mapping is provided. The method is based on the technique of simplicial foliations, generalized to a broader class of domain shapes and applied adaptively in a novel localized manner. This increases flexibility as well as efficiency over the state of the art, while maintaining reliability in guaranteeing map bijectivity.</jats:p>}},
  author       = {{Hinderink, Steffen and Campen, Marcel}},
  issn         = {{0730-0301}},
  journal      = {{ACM Transactions on Graphics}},
  number       = {{4}},
  pages        = {{1--16}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{Galaxy Maps: Localized Foliations for Bijective Volumetric Mapping}}},
  doi          = {{10.1145/3592410}},
  volume       = {{42}},
  year         = {{2023}},
}

@inproceedings{48012,
  abstract     = {{3D printing is a well-established technology with rapidly increasing usage scenarios both in the industry and consumer context. The growing popularity of 3D printing has also attracted security researchers, who have analyzed possibilities for weakening 3D models or stealing intellectual property from 3D models. We extend these important aspects and provide the first comprehensive security analysis of 3D printing data formats. We performed our systematic study on the example of the 3D Manufacturing Format (3MF), which offers a large variety of features that could lead to critical attacks. Based on 3MF’s features, we systematized three attack goals: Data Exfiltration (dex), Denial of Service, and UI Spoofing (uis). We achieve these goals by exploiting the complexity of 3MF, which is based on the Open Packaging Conventions (OPC) format and uses XML to define 3D models. In total, our analysis led to 352 tests. To create and run these tests automatically, we implemented an open-source tool named 3MF Analyzer (tool), which helped us evaluate 20 applications.}},
  author       = {{Rossel, Jost and Mladenov, Vladislav and Somorovsky, Juraj}},
  booktitle    = {{Proceedings of the 26th International Symposium on Research in Attacks, Intrusions and Defenses}},
  keywords     = {{Data Format Security, 3D Manufacturing Format, 3D Printing, Additive Manufacturing}},
  location     = {{Hongkong}},
  publisher    = {{ACM}},
  title        = {{{Security Analysis of the 3MF Data Format}}},
  doi          = {{10.1145/3607199.3607216}},
  year         = {{2023}},
}

@article{60899,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Social insects such as ants and termites communicate via pheromones which allow them to coordinate their activity and solve complex tasks as a swarm, e.g. foraging for food or finding their way back to the nest. This behavior was shaped through evolutionary processes over millions of years. In computational models, self-coordination in swarms has been implemented using probabilistic or pre-defined simple action rules to shape the decision of each agent and the collective behavior. However, manual tuned decision rules may limit the emergent behavior of the swarm. In this work we investigate the emergence of self-coordination and communication in evolved swarms without defining any explicit rule. For this purpose, we evolve a swarm of agents representing an ant colony. We use an evolutionary algorithm to optimize a spiking neural network (SNN) which serves as an artificial brain to control the behavior of each agent. The goal of the evolved colony is to find optimal ways to forage for food and return it to the nest in the shortest amount of time. In the evolutionary phase, the ants are able to learn to collaborate by depositing pheromone near food piles and near the nest to guide other ants. The pheromone usage is not manually encoded into the network; instead, this behavior is established through the optimization procedure. We observe that pheromone-based communication enables the ants to perform better in comparison to colonies where communication via pheromone did not emerge. Furthermore, we assess the foraging performance of the ant colonies by comparing the SNN-based model to a multi-agent rule-based system. Our results show that the SNN-based model can efficiently complete the foraging task in a short amount of time. Our approach illustrates that even in the absence of pre-defined rules, self-coordination via pheromone emerges as a result of the network optimization. This work serves as a proof of concept for the possibility of creating complex applications utilizing SNNs as underlying architectures for multi-agent interactions where communication and self-coordination is desired.
</jats:p>}},
  author       = {{Jimenez Romero, Cristian and Yegenoglu, Alper and Pérez Martín, Aarón and Diaz-Pier, Sandra and Morrison, Abigail}},
  issn         = {{1935-3812}},
  journal      = {{Swarm Intelligence}},
  number       = {{1}},
  pages        = {{1--29}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Emergent communication enhances foraging behavior in evolved swarms controlled by spiking neural networks}}},
  doi          = {{10.1007/s11721-023-00231-6}},
  volume       = {{18}},
  year         = {{2023}},
}

@inbook{45360,
  author       = {{Haase, Michael and Bieber, Maximilian and Tasche, Frederik and Schaper, Mirko and Hoyer, Kay-Peter and Ponik, Bernd and Magyar, Balázs}},
  booktitle    = {{Proceedings of the 19th Rapid.Tech 3D Conference Erfurt, Germany, 9–11 May 2023}},
  editor       = {{Kynast, Michael and Eichmann, Michael and Witt, Gerd}},
  isbn         = {{978-3-446-47941-8}},
  publisher    = {{Carl Hanser Verlag GmbH & Co. KG}},
  title        = {{{Umsetzung einer optimierten Oberflächenschlitzung zur Wirbelstromverlustreduktion auf der Oberfläche eines additiv gefertigten Permanentmagnet-Rotors}}},
  doi          = {{https://doi.org/10.3139/9783446479425.001 }},
  year         = {{2023}},
}

@inproceedings{47084,
  abstract     = {{Fused Deposition Modeling (FDM) is an additive manufacturing process to produce
complex thermoplastic geometries layer by layer. The filament is melted in a nozzle, iteratively
deposited, and then cools down. Due to the solidification process, the deposited filament strands
deviate from their intended position due to shrinkage, resulting in significant geometric deviations
in the final part. In terms of dimensional accuracy, there is a need for optimization, especially for
local curved geometries in relation to the global part with higher nominal dimensions. The aim of
this study is to investigate the size and shape deviations for cylindrical FDM elements and to
compensate the expected deformations by using an in-house software with adaptive scaling factors
in the x-y plane. Previous studies mainly focus on simple, non-curved objects, this study also
considers the influence of curvature and global as well as local deviations on the final part.}},
  author       = {{Koers, Thorsten and Magyar, Balázs}},
  booktitle    = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium 2023}},
  editor       = {{Beaman, Joseph}},
  location     = {{Austin, Texas, USA}},
  title        = {{{Determination and Compensation of the Shrinkage Behavior of Cylindrical Elements in the FDM Process}}},
  doi          = {{https://doi.org/10.26153/tsw/50920}},
  volume       = {{34}},
  year         = {{2023}},
}

@inproceedings{52865,
  abstract     = {{This paper addresses new challenges of detecting campaigns in social media, which emerged with the rise of Large Language Models (LLMs). LLMs particularly challenge algorithms focused on the temporal analysis of topical clusters. Simple similarity measures can no longer capture and map campaigns that were previously broadly similar in content. Herein, we analyze whether the classification of messages over time can be profitably used to rediscover poorly detectable campaigns at the content level. Thus, we evaluate classical classifiers and a new method based on siamese neural networks. Our results show that campaigns can be detected despite the limited reliability of the classifiers as long as they are based on a large amount of simultaneously spread artificial content.}},
  author       = {{Grimme, Britta and Pohl, Janina and Winkelmann, Hendrik and Stampe, Lucas and Grimme, Christian}},
  booktitle    = {{Disinformation in Open Online Media: 5th Multidisciplinary International Symposium, MISDOOM 2023, Amsterdam, The Netherlands, November 21–22, 2023, Proceedings}},
  isbn         = {{978-3-031-47895-6}},
  keywords     = {{Social Media, Campaign Detection, Large Language Models, Siamese Neural Networks}},
  pages        = {{72–87}},
  publisher    = {{Springer-Verlag}},
  title        = {{{Lost in Transformation: Rediscovering LLM-Generated Campaigns in Social Media}}},
  doi          = {{10.1007/978-3-031-47896-3_6}},
  year         = {{2023}},
}

@inproceedings{43090,
  abstract     = {{The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation. }},
  author       = {{Bielak, Christian Roman and Böhnke, Max and Friedlein, Johannes and Bobbert, Mathias and Mergheim, Julia and Steinmann, Paul and Meschut, Gerson}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Numerical analysis of failure modeling in clinching process chain simulation}}},
  doi          = {{10.21741/9781644902417-33}},
  year         = {{2023}},
}

@inproceedings{66195,
  author       = {{Teper, Harun and Betz, Tobias and Von Der Brüggen, Georg and Chen, Kuan-Hsun and Betz, Johannes and Chen, Jian-Jia}},
  booktitle    = {{2023 IEEE 29th International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)}},
  publisher    = {{IEEE}},
  title        = {{{Timing-Aware ROS 2 Architecture and System Optimization}}},
  doi          = {{10.1109/rtcsa58653.2023.00032}},
  year         = {{2023}},
}

@inproceedings{29852,
  author       = {{Beule, Felix and Teutenberg, Dominik and Meschut, Gerson and Aubel, Tobias and Matzenmiller, Anton}},
  booktitle    = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}},
  title        = {{{Methodenentwicklung zur Versagensanalyse aufgrund der Aushärtung vorgeschädigter Klebverbindungen in stahlintensiven Mischbaustrukturen}}},
  year         = {{2022}},
}

@inproceedings{29855,
  author       = {{Carillo Beber, Vinicius and Nagel, Christof and Mayer, Bernd and Köster, Christian and Matzenmiller, Anton and Hecht, Matthias and Baumgartner, Jörg and Melz, Tobias and Tews, Karina and Çavdar, Serkan and Meschut, Gerson}},
  booktitle    = {{22. Kolloquium: Gemeinsame Forschung in der Klebtechnik}},
  title        = {{{Lebensdauerprognose für Stahlklebverbindungen bei multiaxialer Belastung mit Phasenverschiebung, veränderlicher Mittelspannung und variablen Amplituden}}},
  year         = {{2022}},
}

@inproceedings{29344,
  author       = {{Kowatz, Jannik and Teutenberg, Dominik and Meschut, Gerson}},
  booktitle    = {{22. Kolloquium Gemeinsame Forschung in der Klebtechnik}},
  location     = {{Online}},
  title        = {{{Weiterentwicklung der induktiven Schnellhärtung von Klebverbindungen für robuste Fertigungsprozesse unter Berücksichtigung von serienrelevanten Einflussfaktoren}}},
  year         = {{2022}},
}