TY - CONF AB - As technology advances, Unmanned Aerial Vehicles ( UAVs) have emerged as an innovative solution to a variety of problems in many fields. Automated control of UAVs is most common in large area operations, but they may also increase the versatility of smart home compositions by acting as a physical helper. For example, a voice- controlled UAV could act as an intelligent aerial assistant that can be seamlessly integrated into smart home systems. In this paper, we present a novel Augmented Reality (AR )-based UAV control that provides high-level control over a UAV by automating common UAV missions. In our work, we enable users to operate a small UAV hands-free using only a small set of voice commands. To help users identify the targets, and to understand the UAV ’s intentions, targets within the user’s field of vision are highlighted in an AR interface. We evaluate our approach in a user study (n=26) regarding usability, physical and mental demand, as well as a focus on the users’ preferences. Our study showed that the use of the proposed control was not only accepted, but some users stated that they would use such a system at home to help with some tasks at home AU - Helmert, Robin AU - Hardes, Tobias AU - Yigitbas, Enes ID - 47049 T2 - Proceedings of the ACM Symposium on Spatial User Interaction (SUI 2023) TI - Design and Evaluation of an AR Voice-based Indoor UAV Assistant for Smart Home Scenarios ER - TY - JOUR AB - In this article we prove meromorphic continuation of weighted zeta functions in the framework of open hyperbolic systems by using the meromorphically continued restricted resolvent of Dyatlov and Guillarmou (2016). We obtain a residue formula proving equality between residues of weighted zetas and invariant Ruelle distributions. We combine this equality with results of Guillarmou, Hilgert and Weich (2021) in order to relate the residues to Patterson-Sullivan distributions. Finally we provide proof-of-principle results concerning the numerical calculation of invariant Ruelle distributions for 3-disc scattering systems. AU - Schütte, Philipp AU - Weich, Tobias AU - Barkhofen, Sonja ID - 31059 JF - Communications in Mathematical Physics TI - Meromorphic Continuation of Weighted Zeta Functions on Open Hyperbolic Systems VL - 398 ER - TY - GEN AB - We present a numerical algorithm for the computation of invariant Ruelle distributions on convex co-compact hyperbolic surfaces. This is achieved by exploiting the connection between invariant Ruelle distributions and residues of meromorphically continued weighted zeta functions established by the authors together with Barkhofen (2021). To make this applicable for numerics we express the weighted zeta as the logarithmic derivative of a suitable parameter dependent Fredholm determinant similar to Borthwick (2014). As an additional difficulty our transfer operator has to include a contracting direction which we account for with techniques developed by Rugh (1992). We achieve a further improvement in convergence speed for our algorithm in the case of surfaces with additional symmetries by proving and applying a symmetry reduction of weighted zeta functions. AU - Schütte, Philipp AU - Weich, Tobias ID - 51206 T2 - arXiv:2308.13463 TI - Invariant Ruelle Distributions on Convex-Cocompact Hyperbolic Surfaces -- A Numerical Algorithm via Weighted Zeta Functions ER - TY - GEN AB - Let $X=X_1\times X_2$ be a product of two rank one symmetric spaces of non-compact type and $\Gamma$ a torsion-free discrete subgroup in $G_1\times G_2$. We show that the spectrum of $\Gamma \backslash X$ is related to the asymptotic growth of $\Gamma$ in the two direction defined by the two factors. We obtain that $L^2(\Gamma \backslash G)$ is tempered for large class of $\Gamma$. AU - Weich, Tobias AU - Wolf, Lasse Lennart ID - 51207 T2 - arXiv:2304.09573 TI - Temperedness of locally symmetric spaces: The product case ER - TY - JOUR AU - Steffen, Eckhard AU - Wolf, Isaak Hieronymus ID - 51351 JF - Discrete Applied Mathematics KW - Applied Mathematics KW - Discrete Mathematics and Combinatorics SN - 0166-218X TI - Bounds for the chromatic index of signed multigraphs VL - 337 ER - TY - THES AB - Erfolg und Misserfolg eines Unternehmens werden maßgeblich durch getroffene Entscheidungen beeinflusst. Daher verlassen sich Entscheider oft auf Entscheidungsunterstützungssysteme, die durch Datensimulation, -optimierung und -visualisierung bei der Identifizierung von geeigneten Entscheidungen unterstützen. Für eine optimale Unterstützung muss ein Entscheidungsunterstützungssystem (EUS) jedoch auf den Entscheidungsprozess eines Entscheiders abgestimmt sein und verfügbare Daten, Optimierungsziele, persönliche Präferenzen sowie weitere Einflussfaktoren berücksichtigen. EUS-Entwickler können aufgrund der Komplexität und Volatilität von Geschäftsumgebungen allerdings nicht alle potenziellen Entscheidungsprozesse während des Entwurfs eines EUS vorhersehen, wodurch ein EUS einem Entscheider häufig nur unzureichende Anpassungsmöglichkeiten an den individuellen Entscheidungsprozess bietet. Die Einzelanfertigung eines EUS, das auf einen Entscheidungsprozess zugeschnitten ist, ist ein kosten- und zeitintensives Unterfangen aufgrund der begrenzten Verfügbarkeit von Softwareentwicklern oder Missverständnissen zwischen Entwicklern und Entscheidern während der Entwicklung. Daher geben sich Entscheider möglicherweise mit einem handelsüblichen EUS zufrieden, das nicht vollständig mit ihrem Entscheidungsprozess übereinstimmt, suboptimale Entscheidungen begünstigt und so den Unternehmenserfolg negativ beeinflusst. In dieser Arbeit wird ein Ansatz vorgeschlagen, der es Entscheidern ermöglicht, selbst maßgeschneiderte Entscheidungsunterstützungssysteme zu entwickeln und so die Diskrepanz zwischen benötigter und tatsächlicher Entscheidungsunterstützung zu vermeiden. Dazu stellen EUS-Entwickler einen Teil der EUS-Funktionalität als wiederverwendbare Software-Dienste bereit ... AU - Kirchhoff, Jonas ID - 51352 TI - Decision Support Ecosystems: Assisted Low-Code Development of Tailored Decision Support Systems ER - TY - CHAP AU - Cappello, Chiara AU - Steffen, Eckhard ID - 45190 SN - 9783031261039 T2 - The Digital Twin of Humans TI - Graph-Theoretical Models for the Analysis and Design of Socio-Technical Networks ER - TY - JOUR AU - Steffen, Eckhard AU - Wolf, Isaak Hieronymus ID - 51357 JF - Discrete Mathematics KW - Discrete Mathematics and Combinatorics KW - Theoretical Computer Science SN - 0012-365X TI - Rotation r-graphs ER - TY - GEN AB - We consider the quantum dynamics of a many-fermion system in $\mathbb R^d$ with an ultraviolet regularized pair interaction as previously studied in [M. Gebert, B. Nachtergaele, J. Reschke, and R. Sims, Ann. Henri Poincar\'e 21.11 (2020)]. We provide a Lieb-Robinson bound under substantially relaxed assumptions on the potentials. We also improve the associated one-body Lieb-Robinson bound on $L^2$-overlaps to an almost ballistic one (i.e., an almost linear light cone) under the same relaxed assumptions. Applications include the existence of the infinite-volume dynamics and clustering of ground states in the presence of a spectral gap. We also develop a fermionic continuum notion of conditional expectation and use it to approximate time-evolved fermionic observables by local ones, which opens the door to other applications of the Lieb-Robinson bounds. AU - Hinrichs, Benjamin AU - Lemm, Marius AU - Siebert, Oliver ID - 51375 T2 - arXiv:2310.17736 TI - On Lieb-Robinson bounds for a class of continuum fermions ER - TY - GEN AB - In the Bogoliubov-Fr\"ohlich model, we prove that an impurity immersed in a Bose-Einstein condensate forms a stable quasi-particle when the total momentum is less than its mass times the speed of sound. The system thus exhibits superfluid behavior, as this quasi-particle does not experience friction. We do not assume any infrared or ultraviolet regularization of the model, which contains massless excitations and point-like interactions. AU - Hinrichs, Benjamin AU - Lampart, Jonas ID - 51376 T2 - arXiv:2311.05361 TI - A Lower Bound on the Critical Momentum of an Impurity in a Bose-Einstein Condensate ER - TY - JOUR AB - For a compact Riemannian locally symmetric space $\Gamma\backslash G/K$ of arbitrary rank we determine the location of certain Ruelle-Taylor resonances for the Weyl chamber action. We provide a Weyl-lower bound on an appropriate counting function for the Ruelle-Taylor resonances and establish a spectral gap which is uniform in $\Gamma$ if $G/K$ is irreducible of higher rank. This is achieved by proving a quantum-classical correspondence, i.e. a 1:1-correspondence between horocyclically invariant Ruelle-Taylor resonant states and joint eigenfunctions of the algebra of invariant differential operators on $G/K$. AU - Hilgert, Joachim AU - Weich, Tobias AU - Wolf, Lasse Lennart ID - 31190 IS - 10 JF - Analysis & PDE TI - Higher rank quantum-classical correspondence VL - 16 ER - TY - GEN AB - We compare the spectral properties of two kinds of linear operators characterizing the (classical) geodesic flow and its quantization on connected locally finite graphs without dead ends. The first kind are transfer operators acting on vector spaces associated with the set of non backtracking paths in the graphs. The second kind of operators are averaging operators acting on vector spaces associated with the space of vertices of the graph. The choice of vector spaces reflects regularity properties. Our main results are correspondences between classical and quantum spectral objects as well as some automatic regularity properties for eigenfunctions of transfer operators. AU - Bux, Kai-Uwe AU - Hilgert, Joachim AU - Weich, Tobias ID - 51205 T2 - arXiv:2307.10876 TI - Spectral correspondences for finite graphs without dead ends ER - TY - JOUR AB - In this paper we complete the program of relating the Laplace spectrum for rank one compact locally symmetric spaces with the first band Ruelle-Pollicott resonances of the geodesic flow on its sphere bundle. This program was started by Flaminio and Forni for hyperbolic surfaces, continued by Dyatlov, Faure and Guillarmou for real hyperbolic spaces and by Guillarmou, Hilgert and Weich for general rank one spaces. Except for the case of hyperbolic surfaces a countable set of exceptional spectral parameters always left untreated since the corresponding Poisson transforms are neither injective nor surjective. We use vector valued Poisson transforms to treat also the exceptional spectral parameters. For surfaces the exceptional spectral parameters lead to discrete series representations of $\mathrm{SL}(2,\mathbb R)$. In higher dimensions the situation is more complicated, but can be described completely. AU - Arends, Christian AU - Hilgert, Joachim ID - 31210 JF - Journal de l’École polytechnique — Mathématiques KW - Ruelle resonances KW - Poisson transforms KW - locally symmetric spaces KW - principal series representations SN - 2429-7100 TI - Spectral correspondences for rank one locally symmetric spaces: the case of exceptional parameters VL - 10 ER - TY - JOUR AU - Hilgert, Joachim AU - Arends, C. ID - 51383 JF - J. de l'École polytechnique — Mathématiques TI - Spectral correspondences for rank one locally symmetric spaces - The case of exceptional parameters VL - 10 ER - TY - JOUR AU - Hilgert, Joachim AU - Glöckner, H. ID - 51384 JF - J. Diff. Equations TI - Aspects of control theory on infinite-dimensional Lie groups and G-manifolds VL - 343 ER - TY - GEN AU - Hilgert, Joachim AU - Arends, C. AU - Frahm, J. ID - 51499 TI - A pairing formula for resonant states on finite regular graphs ER - TY - GEN AU - Hilgert, Joachim AU - Arends, C. AU - Frahm, J. ID - 51500 TI - Edge Laplacians and vector valued Poisson transforms for graphs ER - TY - GEN AU - Hilgert, Joachim AU - Baier, T. AU - Kaya, O. AU - Mourao, J. AU - Nunes, J. ID - 51502 TI - Quantization in fibering polarizations, Mabuchi rays and geometric Peter--Weyl theorem ER - TY - GEN AU - Hilgert, Joachim AU - Guedes Bonthonneau, Y. AU - Guillarmou, C. AU - Weich, Tobias ID - 51521 TI - Ruelle-Taylor resonances of Anosov actions ER - TY - GEN AB - We present a new gradient-like dynamical system related to unconstrained convex smooth multiobjective optimization which involves inertial effects and asymptotic vanishing damping. To the best of our knowledge, this system is the first inertial gradient-like system for multiobjective optimization problems including asymptotic vanishing damping, expanding the ideas laid out in [H. Attouch and G. Garrigos, Multiobjective optimization: an inertial approach to Pareto optima, preprint, arXiv:1506.02823, 201]. We prove existence of solutions to this system in finite dimensions and further prove that its bounded solutions converge weakly to weakly Pareto optimal points. In addition, we obtain a convergence rate of order O(t−2) for the function values measured with a merit function. This approach presents a good basis for the development of fast gradient methods for multiobjective optimization. AU - Sonntag, Konstantin AU - Peitz, Sebastian ID - 32447 T2 - arXiv:2307.00975 TI - Fast Convergence of Inertial Multiobjective Gradient-like Systems with Asymptotic Vanishing Damping ER - TY - GEN AB - Multiobjective optimization plays an increasingly important role in modern applications, where several criteria are often of equal importance. The task in multiobjective optimization and multiobjective optimal control is therefore to compute the set of optimal compromises (the Pareto set) between the conflicting objectives. The advances in algorithms and the increasing interest in Pareto-optimal solutions have led to a wide range of new applications related to optimal and feedback control - potentially with non-smoothness both on the level of the objectives or in the system dynamics. This results in new challenges such as dealing with expensive models (e.g., governed by partial differential equations (PDEs)) and developing dedicated algorithms handling the non-smoothness. Since in contrast to single-objective optimization, the Pareto set generally consists of an infinite number of solutions, the computational effort can quickly become challenging, which is particularly problematic when the objectives are costly to evaluate or when a solution has to be presented very quickly. This article gives an overview of recent developments in the field of multiobjective optimization of non-smooth PDE-constrained problems. In particular we report on the advances achieved within Project 2 "Multiobjective Optimization of Non-Smooth PDE-Constrained Problems - Switches, State Constraints and Model Order Reduction" of the DFG Priority Programm 1962 "Non-smooth and Complementarity-based Distributed Parameter Systems: Simulation and Hierarchical Optimization". AU - Bernreuther, Marco AU - Dellnitz, Michael AU - Gebken, Bennet AU - Müller, Georg AU - Peitz, Sebastian AU - Sonntag, Konstantin AU - Volkwein, Stefan ID - 46578 T2 - arXiv:2308.01113 TI - Multiobjective Optimization of Non-Smooth PDE-Constrained Problems ER - TY - CONF AU - Rautenberg, Frederik AU - Kuhlmann, Michael AU - Ebbers, Janek AU - Wiechmann, Jana AU - Seebauer, Fritz AU - Wagner, Petra AU - Haeb-Umbach, Reinhold ID - 44849 T2 - Fortschritte der Akustik - DAGA 2023 TI - Speech Disentanglement for Analysis and Modification of Acoustic and Perceptual Speaker Characteristics ER - TY - CONF AB - Many Android applications collect data from users. When they do, they must protect this collected data according to the current legal frameworks. Such data protection has become even more important since the European Union rolled out the General Data Protection Regulation (GDPR). App developers have limited tool support to reason about data protection throughout their app development process. Although many Android applications state a privacy policy, privacy policy compliance checks are currently manual, expensive, and prone to error. One of the major challenges in privacy audits is the significant gap between legal privacy statements (in English text) and technical measures that Android apps use to protect their user's privacy. In this thesis, we will explore to what extent we can use static analysis to answer important questions regarding data protection. Our main goal is to design a tool based approach that aids app developers and auditors in ensuring data protection in Android applications, based on automated static program analysis. AU - Khedkar, Mugdha ID - 44146 KW - static analysis KW - data protection and privacy KW - GDPR compliance T2 - Proceedings of the 45th International Conference on Software Engineering: Companion Proceedings (ICSE ‘23) TI - Static Analysis for Android GDPR Compliance Assurance ER - TY - GEN AU - Beckendorf, Björn ID - 52317 TI - Self-Stabilizing Skip-Graph with Growth-bounded Metric ER - TY - JOUR AU - Demir, Caglar AU - Wiebesiek, Michel AU - Lu, Renzhong AU - Ngonga Ngomo, Axel-Cyrille AU - Heindorf, Stefan ID - 46248 JF - ECML PKDD TI - LitCQD: Multi-Hop Reasoning in Incomplete Knowledge Graphs with Numeric Literals ER - TY - CONF AB - Megatrends, such as digitization or sustainability, are confronting the product management of manufacturing companies with a variety of challenges regarding the design of future products, but also the management of the actual products. To successfully position their products in the market, product managers need to gather and analyze comprehensive information about customers, developments in the products’ environment, product usage, and more. The digitization of all aspects of life is making data on these topics increasingly available – via social media, documents, or the internet of things from the products themselves. The systematic collection and analysis of these data enable the exploitation of new potentials for the adaption of existing products and the creation of the products of tomorrow. However, there are still no insights into the main concepts and cause-effect relationships in exploiting data-driven approaches for product management. Therefore, this paper aims to identify the main concepts and advantages of data-driven product management. To answer the corresponding research questions a comprehensive systematic literature review is conducted. From its results, a detailed description of the main concepts of data-driven product management is derived. Furthermore, a taxonomy for the advantages of data-driven product management is presented. The main concepts and the taxonomy allow for a deeper understanding of the topic while highlighting necessary future actions and research needs. AU - Fichtler, Timm AU - Grigoryan, Khoren AU - Koldewey, Christian AU - Dumitrescu, Roman ID - 52369 KW - Product Lifecyle Management (PLM) KW - Data Analytics KW - Data-driven Design KW - Engineering Management KW - Lifecycle Data T2 - 2023 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD) TI - Towards a Data-Driven Product Management – Concepts, Advantages, and Future Research ER - TY - GEN AU - Vernholz, Mats ED - Perla, Loredana ED - Agrati, Laura Sara ED - Vinci, Viviana ED - Scarinci, Alessia ID - 52370 SN - 9791255681038 T2 - Living and Leading in the Next Era: Connecting Teaching, Research, Citizenship and Equity TI - Academic self-concepts of pre-service technology teachers for vocational education in Germany according to the TPACK- Model ER - TY - GEN AU - Knorr, Lukas AU - Schlosser, Florian AU - Meschede, Henning ID - 47540 TI - Economic Integration of a High-Temperature Heat Pump with Flexible Part-load Operation ER - TY - GEN AU - Klassen, Alexander ID - 52480 TI - Fast Partial Reconfiguration for ReconOS64 on Xilinx MPSoC Devices ER - TY - CONF AU - Prager, Raphael Patrick AU - Trautmann, Heike ED - Silva, Sara ED - Paquete, Luís ID - 52530 T2 - Companion Proceedings of the Conference on Genetic and Evolutionary Computation, GECCO 2023, Companion Volume, Lisbon, Portugal, July 15-19, 2023 TI - Investigating the Viability of Existing Exploratory Landscape Analysis Features for Mixed-Integer Problems ER - TY - CONF AB - Automated Algorithm Configuration (AAC) usually takes a global perspective: it identifies a parameter configuration for an (optimization) algorithm that maximizes a performance metric over a set of instances. However, the optimal choice of parameters strongly depends on the instance at hand and should thus be calculated on a per-instance basis. We explore the potential of Per-Instance Algorithm Configuration (PIAC) by using Reinforcement Learning (RL). To this end, we propose a novel PIAC approach that is based on deep neural networks. We apply it to predict configurations for the Lin\textendash Kernighan heuristic (LKH) for the Traveling Salesperson Problem (TSP) individually for every single instance. To train our PIAC approach, we create a large set of 100000 TSP instances with 2000 nodes each \textemdash currently the largest benchmark set to the best of our knowledge. We compare our approach to the state-of-the-art AAC method Sequential Model-based Algorithm Configuration (SMAC). The results show that our PIAC approach outperforms this baseline on both the newly created instance set and established instance sets. AU - Seiler, Moritz Vinzent AU - Rook, Jeroen AU - Heins, Jonathan AU - Preuß, Oliver Ludger AU - Bossek, Jakob AU - Trautmann, Heike ID - 48898 T2 - 2023 IEEE Symposium Series on Computational Intelligence (SSCI) TI - Using Reinforcement Learning for Per-Instance Algorithm Configuration on the TSP ER - TY - CHAP AB - Static analysis tools support developers in detecting potential coding issues, such as bugs or vulnerabilities. Research emphasizes technical challenges of such tools but also mentions severe usability shortcomings. These shortcomings hinder the adoption of static analysis tools, and user dissatisfaction may even lead to tool abandonment. To comprehensively assess the state of the art, we present the first systematic usability evaluation of a wide range of static analysis tools. We derived a set of 36 relevant criteria from the literature and used them to evaluate a total of 46 static analysis tools complying with our inclusion and exclusion criteria - a representative set of mainly non-proprietary tools. The evaluation against the usability criteria in a multiple-raters approach shows that two thirds of the considered tools off er poor warning messages, while about three-quarters provide hardly any fix support. Furthermore, the integration of user knowledge is strongly neglected, which could be used for instance, to improve handling of false positives. Finally, issues regarding workflow integration and specialized user interfaces are revealed. These findings should prove useful in guiding and focusing further research and development in user experience for static code analyses. AU - Nachtigall, Marcus AU - Schlichtig, Michael AU - Bodden, Eric ID - 52662 KW - Automated static analysis KW - Software usability SN - 978-3-88579-726-5 T2 - Software Engineering 2023 TI - Evaluation of Usability Criteria Addressed by Static Analysis Tools on a Large Scale ER - TY - CHAP AB - Application Programming Interfaces (APIs) are the primary mechanism developers use to obtain access to third-party algorithms and services. Unfortunately, APIs can be misused, which can have catastrophic consequences, especially if the APIs provide security-critical functionalities like cryptography. Understanding what API misuses are, and how they are caused, is important to prevent them, eg, with API misuse detectors. However, definitions for API misuses and related terms in literature vary. This paper presents a systematic literature review to clarify these terms and introduces FUM, a novel Framework for API Usage constraint and Misuse classification. The literature review revealed that API misuses are violations of API usage constraints. To address this, we provide unified definitions and use them to derive FUM. To assess the extent to which FUM aids in determining and guiding the improvement of an API misuses detector’s capabilities, we performed a case study on the state-of the-art misuse detection tool CogniCrypt. The study showed that FUM can be used to properly assess CogniCrypt’s capabilities, identify weaknesses and assist in deriving mitigations and improvements. AU - Schlichtig, Michael AU - Sassalla, Steffen AU - Narasimhan, Krishna AU - Bodden, Eric ID - 52660 KW - API misuses API usage constraints KW - classification framework KW - API misuse detection KW - static analysis SN - 978-3-88579-726-5 T2 - Software Engineering 2023 TI - Introducing FUM: A Framework for API Usage Constraint and Misuse Classification ER - TY - JOUR AU - Celledoni, Elena AU - Glöckner, Helge AU - Riseth, Jørgen AU - Schmeding, Alexander ID - 34803 JF - BIT Numerical Mathematics TI - Deep neural networks on diffeomorphism groups for optimal shape reparametrization VL - 63 ER - TY - JOUR AU - Glöckner, Helge AU - Hilgert, Joachim ID - 34793 JF - Journal of Differential Equations KW - 22E65 KW - 28B05 KW - 34A12 KW - 34H05 KW - 46E30 KW - 46E40 SN - 0022-0396 TI - Aspects of control theory on infinite-dimensional Lie groups and G-manifolds VL - 343 ER - TY - JOUR AB - Let $E$ be a finite-dimensional real vector space and $M\subseteq E$ be a convex polytope with non-empty interior. We turn the group of all $C^\infty$-diffeomorphisms of $M$ into a regular Lie group. AU - Glöckner, Helge ID - 34805 IS - 1 JF - Journal of Convex Analysis TI - Diffeomorphism groups of convex polytopes VL - 30 ER - TY - JOUR AU - Glöckner, Helge AU - Tárrega, Luis ID - 34801 IS - 1 JF - Journal of Lie Theory TI - Mapping groups associated with real-valued function spaces and direct limits of Sobolev-Lie groups VL - 33 ER - TY - JOUR AB - System-level interconnects provide the backbone for increasingly complex systems on a chip. Their vulnerability to electromigration and crosstalk can lead to serious reliability and safety issues during the system lifetime. This article presents an approach for periodic in-system testing which maintains a reliability profile to detect potential problems before they actually cause a failure. Relying on a common infrastructure for EM-aware system workload management and test, it minimizes the stress induced by the test itself and contributes to the self-healing of system-induced electromigration degradations. AU - Sadeghi-Kohan, Somayeh AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 46264 JF - IEEE Design &Test KW - Electrical and Electronic Engineering KW - Hardware and Architecture KW - Software SN - 2168-2356 TI - Workload-Aware Periodic Interconnect BIST ER - TY - CONF AU - Jafarzadeh, Hanieh AU - Klemme, Florian AU - Reimer, Jan Dennis AU - Najafi Haghi, Zahra Paria AU - Amrouch, Hussam AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 45830 T2 - IEEE International Test Conference (ITC'23), Anaheim, USA, October 2023 TI - Robust Pattern Generation for Small Delay Faults under Process Variations ER - TY - BOOK ED - Gräßler, Iris ED - Maier, Günter W. ED - Steffen, Eckhard ED - Roesmann, Daniel ID - 45191 SN - 9783031261039 TI - The Digital Twin of Humans ER - TY - JOUR AU - Gilbert, H. AU - Schürmann, M. AU - Liebendörfer, M. AU - Lawson, D. AU - Hodds, M. ID - 52806 JF - International Journal of Mathematical Education in Science and Technology KW - Applied Mathematics KW - Education KW - Mathematics (miscellaneous) SN - 0020-739X TI - Post-pandemic online mathematics and statistics support: Practitioners’ opinions in Germany and Great Britain & Ireland ER - TY - CHAP AU - Biehler, Rolf AU - Guntermann, Dominik AU - Liebendörfer, Michael AU - Krämer, Sandra AU - Schlüter, Sarah ED - Goethe-Universität Frankfur, IDMI-Primar ID - 52811 SN - 978-3-95987-208-9 T2 - Beiträge zum Mathematikunterricht 2022. 56. Jahrestagung der Gesellschaft für Didaktik der Mathematik TI - Fachdidaktisches Design von Begründungsvideos im Projekt studiVEMINTvideos VL - 1 ER - TY - CHAP AU - Göller, Robin AU - Gildehaus, Lara AU - Liebendörfer, Michael AU - Besser, Michael ED - Härterich, Jörg ED - Kallweit, Michael ED - Rolka, Katrin ED - Skill, Thomas ID - 52810 SN - 978-3-95987-264-5 T2 - Hanse-Kolloquium zur Hochschuldidaktik der Mathematik 2021. Beiträge zum gleichnamigen Online-Symposium am 12 November 2021 aus Bochum TI - Erfassung und Vergleich (mathematischer) Eingangsvoraussetzungen angehender Studierender verschiedener mathematikhaltiger Studiengänge ER - TY - CHAP AU - Kempen, Leander AU - Liebendörfer, Michael ED - Härterich, Jörg ED - Kallweit, Michael ED - Rolka, Katrin ED - Skill, Thomas ID - 52809 SN - 978-3-95987-264-5 T2 - Hanse-Kolloquium zur Hochschuldidaktik der Mathematik 2021. Beiträge zum gleichnamigen Online-Symposium am 12 November 2021 aus Bochum TI - Zu digital - zu viel - zu schwer? Qualitative Einsichten in das Erleben und Handeln von Erstsemester-Studierenden der Mathematik während der Corona-Pandemie ER - TY - CHAP AU - Schlüter, Sarah AU - Liebendörfer, Michael ED - Goethe-Universität Frankfur, IDMI-Primar ID - 52813 SN - 978-3-95987-208-9 T2 - Beiträge zum Mathematikunterricht 2022. 56. Jahrestagung der Gesellschaft für Didaktik der Mathematik TI - Bearbeitungsmuster von Studierenden im Umgang mit formalen Definitionen im Kontext konstanter Folgen VL - 2 ER - TY - CHAP AU - Krämer, Sandra AU - Liebendörfer, Michael ED - Goethe-Universität Frankfur, IDMI-Primar ID - 52812 SN - 978-3-95987-208-9 T2 - Beiträge zum Mathematikunterricht 2022. 56. Jahrestagung der Gesellschaft für Didaktik der Mathematik TI - Förderung prozeduraler Flexibilität durch Lernvideos mit interaktiven Aufgaben VL - 2 ER - TY - JOUR AB - Many preservice mathematics teachers lose their motivation during their first year at university. This phenomenon has been repeatedly described in recent years but is not yet fully under­stood. Since motivation may relate to different objects such as mathematics or teaching, we aim to qualitatively reconstruct different facets of the central motivational constructs of Situated-Expectancy-Value theory (intrinsic value, attainment value, utility value, cost, and expectancy of success) for preservice mathematics teachers. The analysis of longitudinal group interviews of 14 pre­service higher-secondary mathematic teachers from a German university revealed different objects of motivation (e.g., teaching mathematics, scientific mathematics, procedural mathematics, or proof-based mathematics) in preservice teachers' values and expectancy of success. Furthermore, relations between those values and expectancy of success were identified that played a significant role in preservice teachers’ motivational development over their first semester (e.g., relations of attain­ment value for scientific mathematics and psychological cost). Theoretical and practical implications towards a teaching-specific conceptualization of expectancy of success and values and value interventions are being discussed. ID - 52807 TI - Preservice teachers’ mathematics-related values and expectancy in the transition from school to university ER - TY - CHAP AU - de Camargo e Souza Câmara, Igor AU - Turhan, Anni-Yasmin ID - 52859 SN - 0302-9743 T2 - Logics in Artificial Intelligence TI - Deciding Subsumption in Defeasible $$\mathcal {ELI}_\bot $$ with Typicality Models ER - TY - JOUR AU - Gil, Oliver Fernández AU - Patrizi, Fabio AU - Perelli, Giuseppe AU - Turhan, Anni-Yasmin ID - 52861 JF - CoRR TI - Optimal Alignment of Temporal Knowledge Bases VL - abs/2307.15439 ER - TY - CONF AU - Ŝkvorc, Urban AU - Eftimov, Tome AU - Koro]ec, Peter ID - 52863 T2 - 2023 IEEE Symposium Series on Computational Intelligence (SSCI) TI - Analyzing the Generalizability of Automated Algorithm Selection: A Case Study for Numerical Optimization ER - TY - CONF AU - Turhan, Anni-Yasmin ED - Kutz, Oliver ED - Lutz, Carsten ED - Ozaki, Ana ID - 52913 T2 - Proceedings of the 36th International Workshop on Description Logics {(DL} 2023) co-located with the 20th International Conference on Principles of Knowledge Representation and Reasoning and the 21st International Workshop on Non-Monotonic Reasoning {(KR} 2023 and NMR 2023)., Rhodes, Greece, September 2-4, 2023 TI - Brushing-up DLs to Cope with Imperfect Data (Abstract of Joint DL+NMR Invited Talk) VL - 3515 ER - TY - CHAP AU - Kehrbusch, Burkhard AU - Engels, Gregor ED - Vogel-Heuser, Birgit ED - Wimmer, Manuel ID - 28338 T2 - Digital Transformation: Core Technologies and Emerging Topics from a Computer Science Perspective TI - Digital Transformation - Towards flexible human-centric enterprises ER - TY - JOUR AB - Optical traveling wave antennas offer unique opportunities to control and selectively guide light into a specific direction, which renders them excellent candidates for optical communication and sensing. These applications require state-of-the-art engineering to reach optimized functionalities such as high directivity and radiation efficiency, low sidelobe levels, broadband and tunable capabilities, and compact design. In this work, we report on the numerical optimization of the directivity of optical traveling wave antennas made from low-loss dielectric materials using full-wave numerical simulations in conjunction with the particle swarm optimization algorithm. The antennas are composed of a reflector and a director deposited on a glass substrate, and an emitter placed in the feed gap between them serves as an internal source of excitation. In particular, we analyze antennas with rectangular- and horn-shaped directors made of either hafnium dioxide or silicon. The optimized antennas produce highly directional emissions due to the presence of two dominant guided TE modes in the director in addition to leaky modes. These guided modes dominate the far-field emission pattern and govern the direction of the main lobe emission, which predominately originates from the end facet of the director. Our work also provides a comprehensive analysis of the modes, radiation patterns, parametric influences, and bandwidths of the antennas, which highlights their robust nature. AU - Farheen, Henna AU - Leuteritz, Till AU - Linden, Stefan AU - Myroshnychenko, Viktor AU - Förstner, Jens ID - 28413 IS - 1 JF - Journal of the Optical Society of America B KW - tet_topic_opticalantenna SN - 0740-3224 TI - Optimization of optical waveguide antennas for directive emission of light VL - 39 ER - TY - JOUR AB - We study a double-scattering coherent mechanism of negative polarization (NP) near opposition that is observed for powder-like surfaces. The problem is solved numerically for absorbing structures with irregular constituents, cubes, spheres, and ellipsoids larger than the wavelength of incident light. Our simulations show that double scattering between two random irregular particles shows weak NP. Adding one more particle significantly increases the relative contribution of double scattering which enhances NP. Simulations with regular shapes and controlled geometric parameters show that the interference mechanism is sensitive to the geometry of the scattering system and can also result in no polarization or even strong enhancement of positive polarization at backscattering. AU - Alhaddad, Samer AU - Grynko, Yevgen AU - Farheen, Henna AU - Förstner, Jens ID - 29075 IS - 1 JF - Optics Letters KW - tet_topic_scattering SN - 0146-9592 TI - Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles VL - 47 ER - TY - GEN AU - Koldewey, Christian AU - Dumitrescu, Roman AU - Rabe, Martin ID - 29149 T2 - Proceedings of the 55th Hawaii International Conference on System Sciences TI - Introduction to the Data-driven Services in Manufacturing Minitrack - Exploring Management, Engineering, and Organizational Transformation ER - TY - CONF AU - Abughannam, Saed AU - Scheytt, J. Christoph ID - 29767 T2 - International Symposium on Circuits and Systems (ISCAS 2022) TI - Low-Power Low-Data-Rate Wireless PPM Receiver Based on 13-Bits Barker Coded SAW Correlator with Scalable Data-Rate and Sensitivity ER - TY - CONF AU - Abughannam, Saed AU - Kruse, Stephan AU - Iftekhar, Mohammed AU - Scheytt, J. Christoph ID - 29770 T2 - German Microwave Conference 2022 (GeMiC 2022) TI - Design and Measurements of a Low-power Low-Date-rate Direct-detection Wireless Receiver with Improved Co-channel Interference Robustness ER - TY - CONF AB - The development of business models is a challenging task that can be supported with software tools. Here, existing approaches and tools do not focus on the company’s situation in which the development takes place (e.g., financial resources, product type). To tackle this challenge, we used design science research to develop a situation-specific business model development approach that contains three stages: First, existing knowledge in terms of tasks to do (e.g., analyze competitive advantage), and decisions to be made (e.g., social media marketing) are stored in repositories. Second, the knowledge is used to compose a development method based on the company’s situation. Third, the development method is enacted to develop a business model. This demonstration paper presents a tool-support called Situational Business Model Developer that supports all stages of our approach. We release the tool under open-source and evaluate it with a case study on developing business models for mobile apps. AU - Gottschalk, Sebastian AU - Yigitbas, Enes AU - Nowosad, Alexander AU - Engels, Gregor ID - 29839 KW - Business Model Development KW - Situational Method Engineering KW - Tool Support T2 - Proceedings of the 17th International Conference on Wirtschaftsinformatik TI - Situational Business Model Developer: A Tool-support for Situation-specific Business Model Development ER - TY - CONF AB - Due to the proliferation of Virtual Reality (VR) technology, VR is finding new applications in various domains, such as stock trading. Here, traders invest in stocks intending to increase their profit. For this purpose, in conventional stock trading, traders usually make use of 2D applications on desktop or laptop devices. This leads to many drawbacks such as poor visibility due to limited 2D representation, complex interaction due to indirect interaction via mouse and keyboard, or restricted support for collaboration between traders. To overcome these issues, we have developed a novel collaborative, virtual environment for stock trading, which enables stock traders to view financial information and trade stocks with other collaborators. The main results of a usability study indicate that the VR environment, compared to conventional stock trading, shows no significant advantages concerning efficiency and effectiveness, however, we could observe an increased user satisfaction and better collaboration. AU - Yigitbas, Enes AU - Gottschalk, Sebastian AU - Nowosad, Alexander AU - Engels, Gregor ID - 29840 KW - virtual reality KW - stock trading KW - collaboration KW - usability T2 - Proceedings of the 17th International Conference on Wirtschaftsinformatik TI - Development and Evaluation of a Collaborative Stock Trading Environment in Virtual Reality ER - TY - JOUR AU - Castenow, Jannik AU - Kling, Peter AU - Knollmann, Till AU - Meyer auf der Heide, Friedhelm ID - 29843 JF - Information and Computation KW - Computational Theory and Mathematics KW - Computer Science Applications KW - Information Systems KW - Theoretical Computer Science SN - 0890-5401 TI - A Discrete and Continuous Study of the Max-Chain-Formation Problem ER - TY - THES AU - Schneider, Stefan Balthasar ID - 29672 TI - Network and Service Coordination: Conventional and Machine Learning Approaches" ER - TY - CONF AB - Cyber-physical systems generate and collect huge amounts of usage data during operation. Analyzing these data may enable manufacturing companies to identify weaknesses and learn about the users of their products. Such insights are valuable in the early phases of product development like product planning, as they facilitate decision-making for product improvement. The analysis and exploitation of usage data in product planning, however, is a new task for manufacturing companies. To reduce mistakes and improve the results, companies should build upon a suitable reference process model. Unfortunately, established models for analyzing data cannot be easily applied for product planning. In this paper, we propose a reference process model for usage data-driven product planning. It builds on three well-established models for analyzing data and addresses the unique characteristics of usage data-driven product planning. Finally, we customize the model for a manufacturing company and demonstrate how it could be implemented in practice. AU - Meyer, Maurice AU - Wiederkehr, Ingrid AU - Panzner, Melina AU - Koldewey, Christian AU - Dumitrescu, Roman ID - 29380 T2 - Proceedings of the 55th Hawaii International Conference on System Sciences TI - A Reference Process Model for Usage Data-Driven Product Planning ER - TY - CONF AU - Yigitbas, Enes AU - Karakaya, Kadiray AU - Jovanovikj, Ivan AU - Engels, Gregor ED - Grunske, Lars ED - Siegmund, Janet ED - Vogelsang, Andreas ID - 29927 T2 - Software Engineering 2022, Fachtagung des GI-Fachbereichs Softwaretechnik, 21.-25. Februar 2022, Virtuell TI - Enhancing Human-in-the-Loop Adaptive Systems through Digital Twins and VR Interfaces VL - {P-320} ER - TY - CONF AU - Yigitbas, Enes AU - Gorissen, Simon AU - Weidmann, Nils AU - Engels, Gregor ED - Grunske, Lars ED - Siegmund, Janet ED - Vogelsang, Andreas ID - 29926 T2 - Software Engineering 2022, Fachtagung des GI-Fachbereichs Softwaretechnik, 21.-25. Februar 2022, Virtuell TI - Collaborative Software Modeling in Virtual Reality VL - {P-320} ER - TY - CONF AU - Witschen, Linus Matthias AU - Wiersema, Tobias AU - Reuter, Lucas David AU - Platzner, Marco ID - 29945 T2 - 2022 59th ACM/IEEE Design Automation Conference (DAC) TI - Search Space Characterization for Approximate Logic Synthesis ER - TY - CONF AU - Witschen, Linus Matthias AU - Wiersema, Tobias AU - Artmann, Matthias AU - Platzner, Marco ID - 29865 T2 - Design, Automation and Test in Europe (DATE) TI - MUSCAT: MUS-based Circuit Approximation Technique ER - TY - JOUR AB - The growing demand for bandwidth and energy efficiency requires new solutions for signal detection and processing. We demonstrate a concept for high-bandwidth signal detection with low-speed photodetectors and electronics. The method is based on the parallel optical sampling of a high-bandwidth signal with sinc-pulse sequences provided by a Mach-Zehnder modulator. For the electronic detection and processing this parallel sampling enables to divide the high-bandwidth optical signal with the bandwidth B into N electrical signals with the baseband bandwidth of B/(2N) . In proof-of-concept experiments with N=3 , we present the detection of 24 GHz optical signals by detectors with a bandwidth of only 4 GHz. For ideal components, the sampling and bandwidth down-conversion does not add an excess error to the signals and even for the non-ideal components of our proof-of-concept setup, it is below 1%. Thus, the rms error for the measurement of the 24 GHz signal was reduced by a factor of about 3.4 and the effective number of bits were increased by 1.8. AU - Meier, Janosch AU - Singh, Karanveer AU - Misra, Arijit AU - Preussler, Stefan AU - Scheytt, Christoph AU - Schneider, Thomas ID - 30012 JF - IEEE Photonics Journal TI - High-Bandwidth Arbitrary Signal Detection Using Low-Speed Electronics VL - 14 ER - TY - JOUR AB - In this paper, the theory of phase-locking of a microwave oscillator on the interharmonics, i.e. non-integer harmonics, of the repetition rate of the optical pulse train of a mode-locked laser (MLL) is developed. A balanced optical microwave phase detector (BOMPD) is implemented using a balanced Mach-Zehnder modulator and is employed to discriminate the phase difference between the envelope of the optical pulses and the microwave oscillator. It is shown mathematically that the inherent nonlinear properties of BOMPD with respect to the microwave excitation amplitude can be used for interharmonic locking. The characteristic functions of the phase detector for interharmonic locking are derived analytically and are compared with the measurement results. An opto-electronic phase-locked loop (OEPLL) is demonstrated whose output frequency locks on interharmonics of the MLL repetition rate when an appropriate modulator bias and sufficient RF amplitude are applied. Thus, for the first time theory and experiment of reliable locking on interharmonics of the repetition rate of a MLL are presented. AU - Bahmanian, Meysam AU - Kress, Christian AU - Scheytt, Christoph ID - 30011 JF - Optics Express TI - Locking of microwave oscillators on the interharmonics of mode-locked laser signals VL - 14 ER - TY - GEN AU - Roopa, Rajanna ID - 30152 TI - Evaluation of Algorithms for the Node Capacitated Clique ER - TY - GEN AU - Korzeczek, Sebastian ID - 30198 TI - Aufarbeitung und lmplementierung von DAG-Rider ER - TY - GEN AU - Nachtigall, Marcel ID - 30199 TI - Hybrid Routing in Three Dimensions ER - TY - CONF AB - Recent reinforcement learning approaches for continuous control in wireless mobile networks have shown impressive results. But due to the lack of open and compatible simulators, authors typically create their own simulation environments for training and evaluation. This is cumbersome and time-consuming for authors and limits reproducibility and comparability, ultimately impeding progress in the field. To this end, we propose mobile-env, a simple and open platform for training, evaluating, and comparing reinforcement learning and conventional approaches for continuous control in mobile wireless networks. mobile-env is lightweight and implements the common OpenAI Gym interface and additional wrappers, which allows connecting virtually any single-agent or multi-agent reinforcement learning framework to the environment. While mobile-env provides sensible default values and can be used out of the box, it also has many configuration options and is easy to extend. We therefore believe mobile-env to be a valuable platform for driving meaningful progress in autonomous coordination of wireless mobile networks. AU - Schneider, Stefan Balthasar AU - Werner, Stefan AU - Khalili, Ramin AU - Hecker, Artur AU - Karl, Holger ID - 30236 KW - wireless mobile networks KW - network management KW - continuous control KW - cognitive networks KW - autonomous coordination KW - reinforcement learning KW - gym environment KW - simulation KW - open source T2 - IEEE/IFIP Network Operations and Management Symposium (NOMS) TI - mobile-env: An Open Platform for Reinforcement Learning in Wireless Mobile Networks ER - TY - CHAP AB - Multiobjective optimization plays an increasingly important role in modern applications, where several objectives are often of equal importance. The task in multiobjective optimization and multiobjective optimal control is therefore to compute the set of optimal compromises (the Pareto set) between the conflicting objectives. Since the Pareto set generally consists of an infinite number of solutions, the computational effort can quickly become challenging which is particularly problematic when the objectives are costly to evaluate as is the case for models governed by partial differential equations (PDEs). To decrease the numerical effort to an affordable amount, surrogate models can be used to replace the expensive PDE evaluations. Existing multiobjective optimization methods using model reduction are limited either to low parameter dimensions or to few (ideally two) objectives. In this article, we present a combination of the reduced basis model reduction method with a continuation approach using inexact gradients. The resulting approach can handle an arbitrary number of objectives while yielding a significant reduction in computing time. AU - Banholzer, Stefan AU - Gebken, Bennet AU - Dellnitz, Michael AU - Peitz, Sebastian AU - Volkwein, Stefan ED - Michael, Hintermüller ED - Roland, Herzog ED - Christian, Kanzow ED - Michael, Ulbrich ED - Stefan, Ulbrich ID - 16296 SN - 978-3-030-79392-0 T2 - Non-Smooth and Complementarity-Based Distributed Parameter Systems TI - ROM-Based Multiobjective Optimization of Elliptic PDEs via Numerical Continuation ER - TY - CHAP AB - With the ever increasing capabilities of sensors and controllers, autonomous driving is quickly becoming a reality. This disruptive change in the automotive industry poses major challenges for manufacturers as well as suppliers as entirely new design and testing strategies have to be developed to remain competitive. Most importantly, the complexity of autonomously driving vehicles in a complex, uncertain, and safety-critical environment requires new testing procedures to cover the almost infinite range of potential scenarios. AU - Peitz, Sebastian AU - Dellnitz, Michael AU - Bannenberg, Sebastian ED - Bock, H. G. ED - Küfer, K.-H. ED - Maas, P. ED - Milde, A. ED - Schulz, V. ID - 30294 SN - 1612-3956 T2 - German Success Stories in Industrial Mathematics TI - Efficient Virtual Design and Testing of Autonomous Vehicles VL - 35 ER - TY - GEN AU - Schafmeister, Frank ID - 30347 T2 - International Conference on Electric & Electronic in Hybrid and Electric Vehicles and Electric Energy Management (EEHE), TI - Compensation of LF Common-Mode Noise by the internal DC/DC-Stage for transformerless On-Board Chargers at Three- and Single-Phase Operation ER - TY - CONF AU - Förster, Nikolas AU - Rehlaender, Philipp AU - Wallscheid, Oliver AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30349 T2 - Proc. 37th IEEE Applied Power Electronics Conference (APEC) TI - An Open-Source Transistor Database and Toolbox as an Unified Software Engineering Tool for Managing and Evaluating Power Transistors ER - TY - CONF AU - Keuck, Lukas AU - Schafmeister, Frank AU - Böcker, Joachim ID - 30350 T2 - Proc. IEEE International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management (PCIM) TI - Robust Hysteresis Control for LLC Resonant Converters Using a Fully Isolated Measurement Scheme ER - TY - CONF AB - Resonant evanescent coupling can be utilized to selectively excite orbital angular momentum (OAM) modes of high angular order supported by a thin circular dielectric rod. Our 2.5-D hybrid-analytical coupled mode model combines the vectorial fields associated with the fundamental TE- and TM-modes of a standard silicon photonics slab waveguide, propagating at oblique angles with respect to the rod axis, and the hybrid modes supported by the rod. One observes an efficient resonant interaction in cases where the common axial wavenumber of the waves in the slab matches the propagation constant of one or more modes of the rod. For certain modes of high angular order, the incident wave is able to transfer its directionality to the field in the fiber, exciting effectively only one of a pair of degenerate OAM modes AU - Hammer, Manfred AU - Ebers, Lena AU - Förstner, Jens ED - Andrews, David L. ED - Galvez, Enrique J. ED - Rubinsztein-Dunlop, Halina ID - 30387 KW - tet_topic_waveguide T2 - Complex Light and Optical Forces XVI TI - Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber ER - TY - JOUR AU - Cresson, Jacky AU - Jiménez, Fernando AU - Ober-Blöbaum, Sina ID - 30490 JF - AIMS TI - Continuous and discrete Noether's fractional conserved quantities for restricted calculus of variations VL - 14(1) ER - TY - THES AB - In dieser Arbeit wird die elektromagnetische Wellenausbreitung in integrierten optischen Wellenleitern mit Hilfe von halb analytischen und numerischen Simulationsmethoden untersucht. Im ersten Teil werden 2-D Si/SiO2-Wellenleiterkonfigurationen mit hohem Brechungsindexkontrast betrachtet. Die Strukturen werden mit halb geführten Wellen unter schrägen Ausbreitungswinkeln angeregt. Dadurch kann die Leistungsübertragung zu bestimmten ausgehenden Moden unterdrückt werden, wodurch vollständig verlustfreie Systeme entstehen. Zusätzlich dient die Anregung mit einem seitlich begrenzten, einfallenden Wellenbündel aus halb geführten Wellen dazu, praktisch relevantere 3-D Konfigurationen zu realisieren. Darüber hinaus wird eine schrittweise Winkelspektrum-Methode vorgestellt, die es ermöglicht, in Kombination mit voll vektoriellen 2-D Finite-Elemente-Lösungen für Teilprobleme mit geringerer Komplexität, die Wellenausbreitung in planaren, linsenförmigen Wellenleitern numerisch in drei Raumrichtungen zu berechnen. Im zweiten Teil dieser Arbeit wird die Ausbreitung in Wellenleiterstrukturen aus Lithiumniobat untersucht, welche für quantenoptische Effekte genutzt werden. Zur Detektion einzelner Photonen werden supraleitende Nanodrähte auf eindiffundierten Lithiumniobat Wellenleitern mit zusätzlicher Taperschicht aus Silizium betrachtet. Um die Wellenausbreitung in diesen 3-D Wellenleitern zu beschreiben, wird eine einseitig gerichtete Finite-Elemente „Modal Matching“ Methode eingeführt. Abschließend werden Rippenwellenleiter aus Lithiumniobat analysiert, die auf Siliziumdioxid Plattformen aufgebracht sind. Der Schwerpunkt liegt hier auf dem nichtlinearen „Parametric Down-Conversion“ Prozess, der für die Erzeugung verschränkter Photonen verwendet wird. AU - Ebers, Lena ID - 30722 KW - tet_topic_waveguide TI - Semi-guided waves in integrated optical waveguide structures ER - TY - CHAP AU - Temmen, Katrin AU - Kersten, Peter AU - Schäfer, Dominik ID - 29950 SN - 2367-3370 T2 - Mobility for Smart Cities and Regional Development - Challenges for Higher Education TI - Work-in-Progress: The Potential of Interactive Scripts – Supporting Conceptual Understanding and Collaborative Problem-Solving Skills VL - 390 ER - TY - CONF AU - Huber, Jonas AU - Wallmeier, Peter AU - Pieper, Ralf AU - Schafmeister, Frank AU - Kolar, Johann ID - 30844 T2 - Proc. 9th IEEJ International Power Electronics Conference (IPEC) TI - Comparative Evaluation of MVAC-LVDC SST and Hybrid Transformer Concepts for Future Datacenters ER - TY - JOUR AB - AbstractWe consider the problem of maximization of metabolite production in bacterial cells formulated as a dynamical optimal control problem (DOCP). According to Pontryagin’s maximum principle, optimal solutions are concatenations of singular and bang arcs and exhibit the chattering or Fuller phenomenon, which is problematic for applications. To avoid chattering, we introduce a reduced model which is still biologically relevant and retains the important structural features of the original problem. Using a combination of analytical and numerical methods, we show that the singular arc is dominant in the studied DOCPs and exhibits the turnpike property. This property is further used in order to design simple and realistic suboptimal control strategies. AU - Caillau, Jean-Baptiste AU - Djema, Walid AU - Gouzé, Jean-Luc AU - Maslovskaya, Sofya AU - Pomet, Jean-Baptiste ID - 30861 JF - Journal of Optimization Theory and Applications KW - Applied Mathematics KW - Management Science and Operations Research KW - Control and Optimization SN - 0022-3239 TI - Turnpike Property in Optimal Microbial Metabolite Production ER - TY - GEN AB - Algorithm configuration (AC) is concerned with the automated search of the most suitable parameter configuration of a parametrized algorithm. There is currently a wide variety of AC problem variants and methods proposed in the literature. Existing reviews do not take into account all derivatives of the AC problem, nor do they offer a complete classification scheme. To this end, we introduce taxonomies to describe the AC problem and features of configuration methods, respectively. We review existing AC literature within the lens of our taxonomies, outline relevant design choices of configuration approaches, contrast methods and problem variants against each other, and describe the state of AC in industry. Finally, our review provides researchers and practitioners with a look at future research directions in the field of AC. AU - Schede, Elias AU - Brandt, Jasmin AU - Tornede, Alexander AU - Wever, Marcel Dominik AU - Bengs, Viktor AU - Hüllermeier, Eyke AU - Tierney, Kevin ID - 30868 T2 - arXiv:2202.01651 TI - A Survey of Methods for Automated Algorithm Configuration ER - TY - CONF AU - Nicolai, Marcel AU - Zeipert, Henning AU - Lugovtsova, Yevgeniya AU - Bulling, Jannis AU - Johannesmann, Sarah AU - Prager, Jens AU - Henning, Bernd ID - 6590 T2 - Fortschritte der Akustik - DAGA 2022 TI - Quantification of the adhesive coupling of layered structures using guided ultrasonic waves ER - TY - CHAP AU - Yigitbas, Enes AU - Sauer, Stefan AU - Engels, Gregor ED - Vogel-Heuser, Birgit ED - Wimmer, Manuel ID - 29928 T2 - Digital Transformation: Core Technologies and Emerging Topics from a Computer Science Perspective TI - Self-Adaptive Digital Assistance Systems for Work 4.0 ER - TY - CONF AU - Hansmeier, Tim AU - Platzner, Marco ID - 30971 SN - 0302-9743 T2 - Applications of Evolutionary Computation, EvoApplications 2022, Proceedings TI - Integrating Safety Guarantees into the Learning Classifier System XCS VL - 13224 ER - TY - JOUR AU - Feldmann, Michael AU - Padalkin, Andreas AU - Scheideler, Christian AU - Dolev, Shlomi ID - 31060 IS - 4 JF - J. Comput. Biol. TI - Coordinating Amoebots via Reconfigurable Circuits VL - 29 ER - TY - JOUR AB - Encrypting data before sending it to the cloud ensures data confidentiality but requires the cloud to compute on encrypted data. Trusted execution environments, such as Intel SGX enclaves, promise to provide a secure environment in which data can be decrypted and then processed. However, vulnerabilities in the executed program give attackers ample opportunities to execute arbitrary code inside the enclave. This code can modify the dataflow of the program and leak secrets via SGX side channels. Fully homomorphic encryption would be an alternative to compute on encrypted data without data leaks. However, due to its high computational complexity, its applicability to general-purpose computing remains limited. Researchers have made several proposals for transforming programs to perform encrypted computations on less powerful encryption schemes. Yet current approaches do not support programs making control-flow decisions based on encrypted data. We introduce the concept of dataflow authentication (DFAuth) to enable such programs. DFAuth prevents an adversary from arbitrarily deviating from the dataflow of a program. Our technique hence offers protections against the side-channel attacks described previously. We implemented two flavors of DFAuth, a Java bytecode-to-bytecode compiler, and an SGX enclave running a small and program-independent trusted code base. We applied DFAuth to a neural network performing machine learning on sensitive medical data and a smart charging scheduler for electric vehicles. Our transformation yields a neural network with encrypted weights, which can be evaluated on encrypted inputs in \( 12.55 \,\mathrm{m}\mathrm{s} \) . Our protected scheduler is capable of updating the encrypted charging plan in approximately 1.06 seconds. AU - Fischer, Andreas AU - Fuhry, Benny AU - Kußmaul, Jörn AU - Janneck, Jonas AU - Kerschbaum, Florian AU - Bodden, Eric ID - 31844 IS - 3 JF - ACM Transactions on Privacy and Security KW - Safety KW - Risk KW - Reliability and Quality KW - General Computer Science SN - 2471-2566 TI - Computation on Encrypted Data Using Dataflow Authentication VL - 25 ER - TY - GEN AU - Hillebrandt, Henning ID - 31947 TI - Verteiltes Berechnen kompakter Routingtabellen in Unit Disk Graphen ER - TY - JOUR AB - AbstractWe show that for a generic conformal metric perturbation of a compact hyperbolic 3-manifold $$\Sigma $$ Σ with Betti number $$b_1$$ b 1 , the order of vanishing of the Ruelle zeta function at zero equals $$4-b_1$$ 4 - b 1 , while in the hyperbolic case it is equal to $$4-2b_1$$ 4 - 2 b 1 . This is in contrast to the 2-dimensional case where the order of vanishing is a topological invariant. The proof uses the microlocal approach to dynamical zeta functions, giving a geometric description of generalized Pollicott–Ruelle resonant differential forms at 0 in the hyperbolic case and using first variation for the perturbation. To show that the first variation is generically nonzero we introduce a new identity relating pushforwards of products of resonant and coresonant 2-forms on the sphere bundle $$S\Sigma $$ S Σ with harmonic 1-forms on $$\Sigma $$ Σ . AU - Cekić, Mihajlo AU - Delarue, Benjamin AU - Dyatlov, Semyon AU - Paternain, Gabriel P. ID - 31982 IS - 1 JF - Inventiones mathematicae KW - General Mathematics SN - 0020-9910 TI - The Ruelle zeta function at zero for nearly hyperbolic 3-manifolds VL - 229 ER - TY - CONF AB - Testing is one of the most frequent means of quality assurance for software. Property-based testing aims at generating test suites for checking code against user-defined properties. Test input generation is, however, most often independent of the property to be checked, and is instead based on random or user-defined data generation.In this paper, we present property-driven unit testing of functions with numerical inputs and outputs. Alike property-based testing, it allows users to define the properties to be tested for. Contrary to property-based testing, it also uses the property for a targeted generation of test inputs. Our approach is a form of learning-based testing where we first of all learn a model of a given black-box function using standard machine learning algorithms, and in a second step use model and property for test input generation. This allows us to test both predefined functions as well as machine learned regression models. Our experimental evaluation shows that our property-driven approach is more effective than standard property-based testing techniques. AU - Sharma, Arnab AU - Melnikov, Vitaly AU - Hüllermeier, Eyke AU - Wehrheim, Heike ID - 32311 T2 - Proceedings of the 10th IEEE/ACM International Conference on Formal Methods in Software Engineering (FormaliSE) TI - Property-Driven Testing of Black-Box Functions ER - TY - CONF AB - To build successful software products, developers continuously have to discover what features the users really need. This discovery can be achieved with continuous experimentation, testing different software variants with distinct user groups, and deploying the superior variant for all users. However, existing approaches do not focus on explicit modeling of variants and experiments, which offers advantages such as traceability of decisions and combinability of experiments. Therefore, our vision is the provision of model-driven continuous experimentation, which provides the developer with a framework for structuring the experimentation process. For that, we introduce the overall concept, apply it to the experimentation on component-based software architectures and point out future research questions. In particular, we show the applicability by combining feature models for modeling the software variants, users, and experiments (i.e., model-driven) with MAPE-K for the adaptation (i.e., continuous experimentation) and implementing the concept based on the component-based Angular framework. AU - Gottschalk, Sebastian AU - Yigitbas, Enes AU - Engels, Gregor ID - 29842 KW - continuous experimentation KW - model-driven KW - component-based software architectures KW - self-adaptation T2 - Proceedings of the 18th International Conference on Software Architecture Companion TI - Model-driven Continuous Experimentation on Component-based Software Architectures ER - TY - CHAP AU - Häsel-Weide, Uta AU - Wallner, Melina AU - Hattermann, M. ED - Gutzmann, M. ED - Carle, U. ID - 32233 T2 - Anfangsunterricht für alle Kinder - Willkommen in der Schule! TI - Symmetrieverständnis von Anfang an ER - TY - JOUR AB - Aspects of data science surround us in many contexts, for example regarding climate change, air pollution, and other environmental issues. To open the “data-science-black-box” for lower secondary school students we developed a data science project focussing on the analysis of self-collected environmental data. We embed this project in computer science education, which enables us to use a new knowledge-based programming approach for the data analysis within Jupyter Notebooks and the programming language Python. In this paper, we evaluate the second cycle of this project which took place in a ninth-grade computer science class. In particular, we present how the students coped with the professional tool of Jupyter Notebooks for doing statistical investigations and which insights they gained. AU - PODWORNY, SUSANNE AU - Hüsing, Sven AU - SCHULTE, CARSTEN ID - 32335 IS - 2 JF - STATISTICS EDUCATION RESEARCH JOURNAL KW - Education KW - Statistics and Probability SN - 1570-1824 TI - A PLACE FOR A DATA SCIENCE PROJECT IN SCHOOL: BETWEEN STATISTICS AND EPISTEMIC PROGRAMMING VL - 21 ER - TY - CONF AB - The market for microinverters is growing, especially in Europe. Driven by the strongly rising prices for electricity, many small photovoltaic energy systems are being installed. Since monitoring for these plants is often quite costly, their yields are often not logged. Since 2014, microinverters have been studied at the University of Paderborn. The investigations are divided into indoor and outdoor tests. In the indoor area conversion efficiencies as a function of load have been measured with high accuracy and ranked according to Euro- and CEC weightings. In the outdoor laboratory, the behavior in the real world is tested. Energy yields have been measured outdoors via identical and calibrated crystalline silicon PV modules. Here, the investigations were carried out with modules of the power of 215 Wp until the year 2020. Because of the increasing module power nowadays, modules with an output of 360 Wp are now being used. To assess the influence of PV module size, two extremes have been investigated: A rather small module with 215 Wp - as it has been used 10 years ago, and a brand-new module (2021) offering 360 Wp. Both types of modules contain 60 solar cells in series connection. Appling the low-power modules, the challenge for the different micro-inverters has been during weak-light conditions, using the high-power modules, some inverters temporarily reach their power limits and yield is reduced. A method using a reference configuration of inverter & module and a linear equation resulting in the actual yield, any module & inverter configuration can be characterized by just the two coefficients. AU - Krauter, Stefan AU - Bendfeld, Jörg AU - Möller, Marius Claus ID - 32334 T2 - Proceedings of the 49th IEEE Photovoltaic Specialists Conference TI - Microinverter testing update using high power modules: Efficiency, yield, and conformity to a new ”estimation formula” for variation of PV panel size ER - TY - CHAP AU - Häsel-Weide, Uta AU - Seitz, S. AU - Wallner, Melina AU - Wilke, Y. ED - Lutz, D. ED - Becker, J. ED - Buchhaupt, F. ED - Katzenbach, D. ED - Strecker, A. ED - Urban, M. ID - 32339 T2 - Qualifizierung für Inklusion. Sekundarstufe TI - Professionalisierung für inklusiven Mathematikunterricht. Interdisziplinäre Seminarkonzeption zur reflexiven Professionalisierung angehender Mathematiklehrkräfte in der Sekundarstufe ER - TY - JOUR AU - Hähn, K. AU - Häsel-Weide, Uta AU - Scherer, P. ID - 32338 IS - 2 JF - QfI - Qualifizierung für Inklusion TI - Diagnosegeleitete Förderung im inklusiven Mathematikunterricht der Grundschule – Professionalisierung durch reflektierte Handlungspraxis in der Lehrer*innenbildung. VL - 3 ER - TY - CONF AB - This paper provides a hybrid energy system model created in Matlab/Simulink which is based on photovoltaics as its main energy source. The model includes a hybrid energy storage which consists of a short-term lithium-ion battery and hydrogen as long-term storage to ensure autonomy even during periods of low PV production (e.g., in winter). The sectors heat and electricity are coupled by using the waste-heat generated by production and reconversion of hydrogen through an electrolyser respectively a fuel cell. A heat pump has been considered to cover the residual heat demand (for well insulated homes). Within this paper a model of the space heating system as well as the hot water heating system is presented. The model is designed for the simulation and analysis of a whole year energy flow by using a time series of loads, weather and heat profiles as input. Moreover, results of the energy balance within the energy system by simulation of a complete year by varying the orientation (elevation and azimuth) of the PV system and the component sizing, such as the lithium-ion battery capacity, are presented. It turned out that a high amount of heating energy can be saved by using the waste heat generated by the electrolyser and the fuel cell. The model is well suited for the analysis of the effects of different component dimensionings in a hydrogen-based energy system via the overall energy balance within the residential sector. AU - Möller, Marius Claus AU - Krauter, Stefan ID - 32333 T2 - Proceedings of the 49th IEEE Photovoltaic Specialists Conference TI - Model of a Self-Sufficient PV Home using a Hybrid Storage System based on Li-Ion Batteries and Hydrogen Storage with Waste Heat Utilization ER - TY - JOUR AB - In this paper, a model of a hybrid, hydrogen-based energy system for a household which includes the heating sector is presended. With such an energy system it's possible to enable energy autarky over a whole year based on solar energy. The scope of this study was to present a verified hybrid energy system model created in Simulink which can be used to prospectively size future similar energy systems where hydrogen in combination with a li-ion battery shall be used as energy storage type. AU - Möller, Marius Claus AU - Krauter, Stefan ID - 30262 JF - Energies / Special Issue "Sustainable Energy Concepts for Energy Transition" SN - 1996-1073 TI - Hybrid Energy System Model in Matlab/Simulink based on Solar Energy, Lithium-Ion Battery and Hydrogen VL - 15 (6), 2201 ER -