@inproceedings{59699, author = {{Jungemann, Linus and Wintermann, Bjarne and Riebler, Heinrich and Plessl, Christian}}, booktitle = {{Proceedings of the 2025 ACM/SIGDA International Symposium on Field Programmable Gate Arrays}}, publisher = {{ACM}}, title = {{{Neural Network Inference in High-Performance Computing: Closing the Gap for FINN based Reconfigurable Accelerators}}}, doi = {{10.1145/3706628.3708857}}, year = {{2025}}, } @article{59805, abstract = {{The LLC converter achieves the highest efficiency in resonant operation. Conventionally, the input DC-link voltage is controlled to operate the LLC converter at resonance for the given operating point. However, the DC-link capacitor voltage shows a low-frequency voltage ripple (typically the second harmonic of grid frequency) in cascaded converters so that the LLC has to adapt its switching frequency within the grid period. Conventionally, the LLC converter operates 50% of the time above the resonant frequency of 40 kHz and 50% below resonance. Both operating conditions cause additional losses. However, experimental measurements indicate that the below-resonance operation causes significantly higher losses than above-resonance operation due to much higher primary and secondary transformer currents. It is better to increase the DC-link voltage by 30% of the peak-to-peak low-frequency voltage ripple to mostly avoid below-resonance operation (i.e., from 650 V to 680 V in this case). With the proposed control, the LLC converter operates about 75% of time over resonance and only 25% of time below resonance. The overall efficiency increases from 97.66% to 97.7% for the average operating point with an 80% load current. This corresponds to a 2% total loss reduction. Finally, the peak resonance capacitor voltage decreases from 910 V to 790 V (−13%).}}, author = {{Unruh, Roland and Böcker, Joachim and Schafmeister, Frank}}, issn = {{2079-9292}}, journal = {{Electronics}}, keywords = {{adaptive DC-link voltage, cascaded H-bridge, resonant operation, Full-Bridge Converter, loss minimization, LLC Resonant Converter, peak capacitor voltage reduction}}, number = {{8}}, publisher = {{MDPI AG}}, title = {{{Adaptive DC-Link Voltage Control for 22 kW, 40 kHz LLC Resonant Converter Considering Low-Frequency Voltage Ripple}}}, doi = {{10.3390/electronics14081517}}, volume = {{14}}, year = {{2025}}, } @article{59806, abstract = {{We introduce a model of information dissemination in signed networks. It is a discrete-time process in which uninformed actors incrementally receive information from their informed neighbors or from the outside. Our goal is to minimize the number of confused actors — that is, the number of actors who receive contradictory information. We prove upper bounds for the number of confused actors in signed networks and in equivalence classes of signed networks. In particular, we show that there are signed networks where, for any information placement strategy, almost 60% of the actors are confused. Furthermore, this is also the case when considering the minimum number of confused actors within an equivalence class of signed graphs.}}, author = {{Jin, Ligang and Steffen, Eckhard}}, issn = {{0166-218X}}, journal = {{Discrete Applied Mathematics}}, pages = {{99--106}}, publisher = {{Elsevier BV}}, title = {{{Information dissemination and confusion in signed networks}}}, doi = {{10.1016/j.dam.2025.04.049}}, volume = {{373}}, year = {{2025}}, } @article{59803, author = {{Drossel, Kerstin and Niemann, Jan and Eickelmann, Birgit and Niggemeier, Johannes Bernd}}, issn = {{0937-7239}}, journal = {{SchulVerwaltung Nordrhein-Westfalen}}, pages = {{100--104}}, publisher = {{Carl Link Verlag}}, title = {{{Digitale Kompetenzen von Schüler:innen und Rahmenbedingungen des Kompetenzerwerbs in Nordrhein-Westfalen}}}, volume = {{4}}, year = {{2025}}, } @inbook{52735, author = {{Bellinger, Franziska and Dehmel, Lukas}}, booktitle = {{Perspektiven auf Bildung in Europa. Festschrift für Beatrix Niemexer-Jensen.}}, editor = {{Bellinger, Franziska and Thon, Christine and Wischmann, Anke}}, pages = {{37--48}}, title = {{{Europäische Bildungsinitiativen als Rahmen medienpädagogischer Professionalisierung in der Erwachsenenbildung. Rekonstruktive Analysen zum Medien(bildungs)begriff}}}, year = {{2025}}, } @inproceedings{58801, abstract = {{Iran employs one of the most prominent Internet censors in the world. An important part of Iran’s censorship apparatus is its analysis of unencrypted protocols such as HTTP and DNS. During routine evaluations of Iran’s HTTP and DNS censorship, we noticed several properties we believe to be unknown today. For instance, we found injections of correct static IPs for some domains such as google.com on the DNS level, unclear HTTP version parsing, and correlations between DNS and HTTP censorship. In this paper, we present our findings to the community and discuss possible takeaways for affected people and the censorship circumvention community. As some of our findings left us bewildered, we hope to ignite a discussion about Iran’s censorship behavior. We aim to use the discussion of our work to execute a thorough analysis and explanation of Iran’s censorship behavior in the future.}}, author = {{Lange, Felix and Niere, Niklas and von Niessen, Jonathan and Suermann, Dennis and Heitmann, Nico and Somorovsky, Juraj}}, booktitle = {{Proceedings on Privacy Enhancing Technologies}}, location = {{Virtual}}, title = {{{I(ra)nconsistencies: Novel Insights into Iran’s Censorship}}}, year = {{2025}}, } @unpublished{59839, abstract = {{In many scientific approaches, especially in those that try to foster explainability of Artificial Intelligences, a narrow conception of explaining prevails. This narrow conception implies that explaining is a one-directional action in which knowledge is transferred from the explainer to an addressee. By studying the amount of agency in metaphors for explaining in scientific texts, we want to find out – or at least to contribute a partial answer to the question – why this narrow conception is so dominant. For our analysis, we use a linguistic conception of agency, transitivity. This concept allows to specify the degree of agency or effectiveness of the action in a verbalised event. It is defined by several component parts. We detail and discuss both the parameters of and global transitivity. Overall, transitivity of explaining metaphors has a rather common pattern across metaphors. Agency is not high and reduced in characteristic aspects: The metaphors imply that the object of explaining is static, i.e., is not changed within the explanation, and that explaining is the activity of one person only. This pattern may account for the narrow conception of explaining. It contrasts strongly with current co-constructive or sociotechnical approaches to explainability.}}, author = {{Scharlau, Ingrid and Rohlfing, Katharina J.}}, publisher = {{Center for Open Science}}, title = {{{Agency in metaphors of explaining: An analysis of scientific texts}}}, year = {{2025}}, } @inproceedings{59835, author = {{Hustermeier, Lennart and Yigitbas, Enes}}, booktitle = {{Proceedings of the 20th IFIP TC13 International Conference on Human-Computer Interaction (INTERACT 2025)}}, publisher = {{Springer}}, title = {{{A Novel Approach for Controlling Drone Swarms: Integrating LLMs and Augmented Reality}}}, year = {{2025}}, } @inproceedings{59840, abstract = {{The Semantic Web and Graph Database communities have developed three distinct schema languages for RDF and graph-structured data: SHACL, ShEx, and PG-Schema. Each language has its unique approach to defining constraints and validating graph data. In this work, we provide formal, concise definitions of the core components of each of these schema languages. We employ a uniform framework to facilitate a comprehensive comparison between the languages and identify a common set of functionalities, shedding light on both overlapping and distinctive features of the three languages. }}, author = {{Ahmetaj, Shqiponja and Boneva, Iovka and Hidders, Jan and Hose, Katja and Jakubowski, Maxime and Labra Gayo, Jose Emilio and Martens, Wim and Mogavero, Fabio and Murlak, Filip and Okulmus, Cem and Polleres, Axel and Savković, Ognjen and Šimkus, Mantas and Tomaszuk, Dominik}}, booktitle = {{Proceedings of the ACM on Web Conference 2025}}, location = {{Sidney, Australia}}, pages = {{8--12}}, publisher = {{ACM}}, title = {{{Common Foundations for SHACL, ShEx, and PG-Schema}}}, doi = {{10.1145/3696410.3714694}}, year = {{2025}}, } @inbook{58724, author = {{Brennig, Katharina and Kaltenpoth, Sascha Benjamin and Müller, Oliver}}, booktitle = {{Lecture Notes in Business Information Processing}}, isbn = {{9783031786655}}, issn = {{1865-1348}}, publisher = {{Springer Nature Switzerland}}, title = {{{Straight Outta Logs: Can Large Language Models Overcome Preprocessing in Next Event Prediction?}}}, doi = {{10.1007/978-3-031-78666-2_15}}, year = {{2025}}, } @article{59846, author = {{Mildorf, Jarmila}}, issn = {{0039-4130}}, journal = {{Studium Ricerca, Letteratura}}, number = {{1}}, pages = {{134--160}}, title = {{{The Voice of the Bard: Milton’s Paradise Lost on Radio}}}, volume = {{121}}, year = {{2025}}, } @article{59847, abstract = {{Abstract The surface-assisted assembly of DNA origami lattices is a potent method for creating molecular lithography masks. Lattice quality and assembly kinetics are controlled by various environmental parameters, including the employed surface, the assembly temperature, and the ionic composition of the buffer, with optimized parameter combinations resulting in highly ordered lattices that can span surface areas of several cm2. Established assembly protocols, however, employ assembly times ranging from hours to days. Here, the assembly of highly ordered hexagonal DNA origami lattices at mica surfaces is observed within few minutes using high-speed atomic force microscopy (HS-AFM). A moderate increase in the DNA origami concentration enables this rapid assembly. While forming a regular lattice takes 10 min at a DNA origami concentration of 4 nM, this time is shortened to about 2 min at a concentration of 6 nM. Increasing the DNA origami concentration any further does not result in shorter assembly times, presumably because DNA origami arrival at the mica surface is diffusion-limited. Over short length scales up to 1 µm, lattice order is independent of the DNA origami concentration. However, at larger length scales of a few microns, a DNA origami concentration of 10 nM yields slightly better order than lower and higher concentrations. Therefore, 10 nM can be considered the optimum concentration for the rapid assembly of highly ordered DNA origami lattices. These results thus represent an important step toward the industrial-scale application of DNA origami-based lithography masks.}}, author = {{Pothineni, Bhanu Kiran and Barner, Jörg and Grundmeier, Guido and Contreras, David and Castro, Mario and Keller, Adrian}}, issn = {{2731-9229}}, journal = {{Discover Nano}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Rapid assembly of highly ordered DNA origami lattices at mica surfaces}}}, doi = {{10.1186/s11671-025-04254-2}}, volume = {{20}}, year = {{2025}}, } @inbook{53445, author = {{Hälterlein, Jens}}, booktitle = {{The Realities of Autonomous Weapons}}, editor = {{Bächle, Thomas Christian and Bareis, Jascha}}, pages = {{187--204}}, publisher = {{Bristol University Press}}, title = {{{Governing Autonomies: Imagining Responsible Artificial Intelligence in the “Future Combat Air System” European Armament Project}}}, year = {{2025}}, } @unpublished{59860, abstract = {{A three-dimensional quasi-Fuchsian Lorentzian manifold $M$ is a globally hyperbolic spacetime diffeomorphic to $\Sigma\times (-1,1)$ for a closed orientable surface $\Sigma$ of genus $\geq 2$. It is the quotient $M=\Gamma\backslash \Omega_\Gamma$ of an open set $\Omega_\Gamma\subset {\rm AdS}_3$ by a discrete group $\Gamma$ of isometries of ${\rm AdS}_3$ which is a particular example of an Anosov representation of $\pi_1(\Sigma)$. We first show that the spacelike geodesic flow of $M$ is Axiom A, has a discrete Ruelle resonance spectrum with associated (co-)resonant states, and that the Poincar\'e series for $\Gamma$ extend meromorphically to $\mathbb{C}$. This is then used to prove that there is a natural notion of resolvent of the pseudo-Riemannian Laplacian $\Box$ of $M$, which is meromorphic on $\mathbb{C}$ with poles of finite rank, defining a notion of quantum resonances and quantum resonant states related to the Ruelle resonances and (co-)resonant states by a quantum-classical correspondence. This initiates the spectral study of convex co-compact pseudo-Riemannian locally symmetric spaces.}}, author = {{Delarue, Benjamin and Guillarmou, Colin and Monclair, Daniel}}, booktitle = {{arXiv:2504.21762}}, title = {{{Spectra of Lorentzian quasi-Fuchsian manifolds}}}, year = {{2025}}, } @inbook{59867, author = {{Dübbert, Alexander}}, booktitle = {{Transdisziplinäre Räume in den Kulturwissenschaften}}, editor = {{Kornbach, Alina and Lammer, Christina and Magdeburg, Lena}}, pages = {{403--429}}, publisher = {{Herder}}, title = {{{Muster in der Benamung 'nachhaltiger' Lebensmittelmarkennamen - Kulturbezogene Deutungen von Namen am stationären Verkaufsort als Raum}}}, volume = {{3}}, year = {{2025}}, } @book{59862, editor = {{Kornbach, Alina and Lammer, Christina and Magdeburg, Lena Maria}}, publisher = {{Herder Verlag}}, title = {{{Transdisziplinäre Räume in den Kulturwissenschaften}}}, volume = {{3}}, year = {{2025}}, } @article{59870, abstract = {{ One of the most important strategies for reducing CO 2 emissions in the mobility sector is lightweight construction. In particular, the car body offers several opportunities for weight reduction. Multi-material designs are increasingly being applied to select the most suitable material for the respective load and ultimately achieve synergy effects. For example, aluminium castings are used at the nodes of a spaceframe body. Subsequently, these are joined with profiles to form the bodyshell. To join different materials mechanical joining techniques, such as semi-tubular self-piercing riveting, are deployed. According to the current state of the art, cracks occur in the aluminium castings during the mechanical joining process as a result of the high degree of deformation. Although the aluminium casting alloys of the AlSi-system exhibit low ductility, these alloys reveal excellent castability. In particular, the ability to cast thin structural parts is enabled by the low liquidus point of the near eutectic aluminium casting alloys. This study addresses the mechanical joining properties of the near eutectic aluminium casting alloy AlSi12, depending on different microstructures. These are achieved by annealing processes and modifying agents. Through an adapted heat treatment, the previously lamellar morphology can be transformed into a globular morphology, which leads to increased ductility and prevents the formation of cracks during the self-piercing riveting (SPR). The joinability is investigated using different die geometries, whereas the joint formation is analysed regarding crack initiation. To evaluate the increased ductility, microstructural and mechanical tests are performed and finally, a microstructure-joinability correlation is established.}}, author = {{Neuser, M. and Holtkamp, P.-K. and Hoyer, K.-P. and Kappe, F. and Yildiz, S. and Bobbert, M. and Meschut, G. and Schaper, M.}}, issn = {{1464-4207}}, journal = {{Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications}}, number = {{4}}, pages = {{801--815}}, publisher = {{SAGE Publications}}, title = {{{Mechanical properties and joinability of the near-eutectic aluminium casting alloy AlSi12}}}, doi = {{10.1177/14644207251319922}}, volume = {{239}}, year = {{2025}}, } @article{56482, abstract = {{Dieser Beitrag untersucht Liquiditätseffekte einer Vermögensteuer bei Mietwohnimmobilien. Mithilfe von Daten einer Immobilien-Kapitalgesellschaft werden die Wirkungen einer Vermögensteuer auf die Cashflows aus der Vermietung von Wohnimmobilien simuliert. Der Detailgrad der Daten ermöglicht dabei Analysen auf Jahres-, Regional- und Baujahresebene. Ein Abgleich mit weiteren Immobiliendaten untermauert die Vergleichbarkeit und Aussagekraft der Analysen. Die Ergebnisse der Simulation zeigen, dass die Einführung einer Vermögensteuer den Cashflow aus dem Mietgeschäft erheblich reduzieren und zu Liquiditätsproblemen führen kann. Im Durchschnitt über alle Beobachtungen ergibt sich bei einem Vermögensteuersatz i.H.v. 2 % ein negativer Cashflow nach Berücksichtigung aller Kosten. Generell bedeutet dies, dass wachstumsorientierte Immobilien durch eine Vermögensteuer liquiditätsmäßig stärker belastet werden als mietrenditeorientierte Immobilien. Insbesondere in Großstädten mit hohen Immobilienwerten, aber verhältnismäßig geringen Mieten, können die Liquiditätseffekte mehr als dreimal so hoch ausfallen wie in ländlichen bzw. industriell-geprägten Regionen, was zu einem relativen Attraktivitätsverlust führen kann. Durch die Entkopplung der Vermögensteuer von den Mieterträgen zeichnet sich eine starke Abhängigkeit der Steuerlast von aktuellen Marktentwicklungen und dem Zinsumfeld ab, was eine zusätzliche Unsicherheit für Investoren darstellt. Diese steuerliche Unsicherheit könnte sich potentiell auf die Investitionsbereitschaft auswirken und sollte daher in politischen Diskussionen über die Wiedereinführung einer Vermögensteuer berücksichtigt werden.}}, author = {{Maiterth, Ralf and Piper, Yuri and Sureth-Sloane, Caren}}, journal = {{Steuer und Wirtschaft}}, number = {{1}}, pages = {{67 -- 81}}, title = {{{Liquiditätseffekte einer Vermögensteuer bei Mietwohnimmobilien}}}, volume = {{102}}, year = {{2025}}, } @inbook{59875, author = {{Pätz, Ricarda}}, booktitle = {{Data - Culture - Society: Kulturwissenschaftliche Perspektiven auf Data Society als gesellschaftliche Transformation}}, editor = {{Uppenkamp, Vera and Vösgen-Nordloh, Meike}}, isbn = {{978-3-534-64165-9 }}, pages = {{155--176}}, publisher = {{Herder}}, title = {{{#womeninstem – Eine gendermediale Betrachtung von MINTfluencerinnen und Wissenschaftskommunikation auf Instagram}}}, year = {{2025}}, } @inproceedings{59876, abstract = {{Abstract. Clinching is a conventional mechanical joining process used in Multi-Material Design in the automotive sector. To receive the desired geometrical characteristics in clinch joints, correct process design is required. To reduce the cost of finding fitting process parameters, numerical simulation of the joining process can be used to predict the geometrical characteristics, such as interlock, instead of an experimental approach. These numerical simulation models consume computational resources and time. In this paper machine learning is used to find correlations between features of the joining process and geometrical characteristics in the joint. This serves the purpose of predicting the joint’s target values more resource-efficiently. Modelling with machine learning requires a structured dataset with sufficient parameter variation. To create this data base the following procedure was used. For joining partners, a HC340LA steel alloy with 2 mm material thickness was used punch-sided and an EN AW 5182 aluminum alloy with 1.5 mm thickness was used die-sided. For this combination a suitable tool combination and punch distance was experimentally identified. A finite element model was created to reproduce the joining process. For the modelling of the material of both joining partners flow curves determined by Vallaster et al. were used [1]. The punch and die were recreated digitally by opto-electronic measurements and transformed into a mesh suitable for numerical simulation. The model was validated by comparing process values like the maximum force applied by the punch and geometrical values in the joints cross section. Additionally, a process window for suitable punch distances was experimentally determined. Afterwards a variation of 70 different process designs was conducted with variants inside and outside the process window. The results were used for training, testing and validating various machine learning models. All models competed against each other to find the must suited model to predict every geometric value. To ensure good model performances and prevent the model from overfitting, a tenfold cross validation was used for validating the models. Analysis of the results gives the following key findings: i) Good predictability is reached for the interlock and sheet thickness of the joint. ii) Prediction neck thickness showed low error values, but also low correlation. iii)The prediction of those key values for evaluating clinch joint characteristics by machine learning models positively impacts needed resources in comparison to numerical models.}}, author = {{Ludwig, Jean-Patrick and Tsi-Nda Lontsi, Seraphin and Neumann, Jonas and Kappis, Lukas and Scharr, Christian and Flügge, Wilko and Merklein, Marion and Meschut, Gerson}}, booktitle = {{Materials Research Proceedings}}, issn = {{2474-395X}}, publisher = {{Materials Research Forum LLC}}, title = {{{Data driven prognosis of clinch joints in multi-material design}}}, doi = {{10.21741/9781644903599-157}}, volume = {{54}}, year = {{2025}}, }