@article{26987, abstract = {{Optical metasurfaces are perfect candidates for the phase and amplitude modulation of light, featuring an excellent basis for holographic applications. In this work, we present a dual amplitude holographic scheme based on the photon sieve principle, which is then combined with a phase hologram by utilizing the Pancharatnam–Berry phase. We demonstrate that two types of apertures, rectangular and square shapes in a gold film filled with silicon nanoantennas are sufficient to create two amplitude holograms at two different wavelengths in the visible, multiplexed with an additional phase-only hologram. The nanoantennas are tailored to adjust the spectral transmittance of the apertures, enabling the wavelength sensitivity. The phase-only hologram is implemented by utilizing the anisotropic rectangular structure. Interestingly, such three holograms have quantitative mathematical correlations with each other. Thus, the flexibility of polarization and wavelength channels can be utilized with custom-tailored features to achieve such amplitude and phase holography simultaneously without sacrificing any space-bandwidth product. The present scheme has the potential to store different pieces of information which can be displayed separately by switching the wavelength or the polarization state of the reading light beam.}}, author = {{Frese, Daniel and Sain, Basudeb and Zhou, Hongqiang and Wang, Yongtian and Huang, Lingling and Zentgraf, Thomas}}, issn = {{2192-8614}}, journal = {{Nanophotonics}}, number = {{18}}, pages = {{4543--4550}}, publisher = {{De Gruyter}}, title = {{{A wavelength and polarization selective photon sieve for holographic applications}}}, doi = {{10.1515/nanoph-2021-0440}}, volume = {{10}}, year = {{2021}}, } @inproceedings{29486, author = {{Firmansyah, Asep Fajar and Moussallem, Diego and Ngonga Ngomo, Axel-Cyrille}}, booktitle = {{Proceedings of the 11th on Knowledge Capture Conference}}, isbn = {{978-1-4503-8457-5}}, pages = {{73–80}}, publisher = {{ACM}}, title = {{{GATES: Using Graph Attention Networks for Entity Summarization}}}, doi = {{10.1145/3460210.3493574}}, year = {{2021}}, } @inbook{27592, author = {{Gausemeier, Jürgen and Pierenkemper, Christoph}}, booktitle = {{Digitalization – Approaches, Case Studies, and Tools for Strategy, Transformation and Implementation}}, editor = {{Schallmo, Daniel R. and Tidd, Joseph}}, publisher = {{Springer Nature}}, title = {{{Developing Strategies for Digital Transformation in SMEs with Maturitiy Models}}}, year = {{2021}}, } @article{26854, author = {{Moritzer, Elmar and Flachmann, Felix}}, journal = {{Kunststoffe}}, pages = {{42--44}}, title = {{{Die Fließfront darf nicht brechen}}}, volume = {{12}}, year = {{2021}}, } @inproceedings{29421, author = {{Ober-Blöbaum, Sina and Vermeeren, M.}}, booktitle = {{7th IIFAC Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control LHMNC}}, pages = {{327--333}}, title = {{{Superconvergence of galerkin variational integrators}}}, volume = {{54(19)}}, year = {{2021}}, } @article{16294, abstract = {{Model predictive control is a prominent approach to construct a feedback control loop for dynamical systems. Due to real-time constraints, the major challenge in MPC is to solve model-based optimal control problems in a very short amount of time. For linear-quadratic problems, Bemporad et al. have proposed an explicit formulation where the underlying optimization problems are solved a priori in an offline phase. In this article, we present an extension of this concept in two significant ways. We consider nonlinear problems and - more importantly - problems with multiple conflicting objective functions. In the offline phase, we build a library of Pareto optimal solutions from which we then obtain a valid compromise solution in the online phase according to a decision maker's preference. Since the standard multi-parametric programming approach is no longer valid in this situation, we instead use interpolation between different entries of the library. To reduce the number of problems that have to be solved in the offline phase, we exploit symmetries in the dynamical system and the corresponding multiobjective optimal control problem. The results are verified using two different examples from autonomous driving.}}, author = {{Ober-Blöbaum, Sina and Peitz, Sebastian}}, journal = {{International Journal of Robust and Nonlinear Control}}, pages = {{380--403}}, title = {{{Explicit multiobjective model predictive control for nonlinear systems with symmetries}}}, doi = {{10.1002/rnc.5281}}, volume = {{31(2)}}, year = {{2021}}, } @article{29543, author = {{Djema, Walid and Giraldi, Laetitia and Maslovskaya, Sofya and Bernard, Olivier}}, issn = {{0005-1098}}, journal = {{Automatica}}, keywords = {{Electrical and Electronic Engineering, Control and Systems Engineering}}, publisher = {{Elsevier BV}}, title = {{{Turnpike features in optimal selection of species represented by quota models}}}, doi = {{10.1016/j.automatica.2021.109804}}, volume = {{132}}, year = {{2021}}, } @misc{29549, abstract = {{Als Griechenland 1830 seine Unabhängigkeit erlangte, war das Land wirtschaftlich wenig entwickelt und von der Industrialisierung noch kaum berührt. Kredite für die Gründung oder den Ausbau von Unternehmen waren auf Grund des Kapitalmangels entweder unmöglich oder extrem teuer – ein für die wirtschaftliche Entwicklung ernst zu nehmendes Hemmnis. Das Land brauchte zur wirtschaftlichen Entwicklung also Investitionen aus dem Ausland. Jedoch hielten sich die europäischen Banken und Anleger mit solchen Investitionen vor den 1870er Jahren zurück. Warum diese Scheu der Kapitalanleger vor Griechenland, obwohl sie anderswo keineswegs vor risikoreichen Investitionen zurückschreckten, wenn nur entsprechend hohe Erträge lockten? Dieser Frage möchte der Beitrag anhand eines Beispiels nachgehen: der bayerisch-französischen Bankiersfamilie von Eichthal, die in den 1830er Jahren enge Geschäftsbeziehungen nach Griechenland aufbaute und zeitweilig sehr interessiert an Investitionen war – bevor das Bankhaus sich von diesen Plänen schließlich unverrichteter Dinge wieder abwandte. Das kulturelle Interesse an Griechenland überdauerte dagegen bis in die 1880er Jahre. Die Eichthals eignen sich hervorragend, um paradigmatisch zu untersuchen, auf welcher Grundlage und wie europäische Bankiers ihre Investitionsentscheidungen für oder gegen Griechenland trafen.}}, author = {{Schönhärl, Korinna}}, title = {{{Finanzielle Netze. Die bayerisch–französische Familienbank von Eichthal und ihre Investitionspläne in Griechenland in den 1830er Jahren/ Οικονομικά δίκτυα. Η βαυαρογαλλική οικογενειακή τράπεζα των Άιχταλ και τα επενδυτικά σχέδιά της στην Ελλάδα κατά τη δεκαετία του 1830}}}, year = {{2021}}, } @inproceedings{29566, author = {{Bobolz, Jan and Eidens, Fabian and Krenn, Stephan and Ramacher, Sebastian and Samelin, Kai}}, booktitle = {{Cryptology and Network Security}}, isbn = {{9783030925475}}, issn = {{0302-9743}}, publisher = {{Springer International Publishing}}, title = {{{Issuer-Hiding Attribute-Based Credentials}}}, doi = {{10.1007/978-3-030-92548-2_9}}, year = {{2021}}, } @article{28463, author = {{Hanisch, Simon and Arias Cabarcos, Patricia and Parra-Arnau, Javier and Strufe, Thorsten}}, journal = {{CoRR}}, title = {{{Privacy-Protecting Techniques for Behavioral Data: A Survey}}}, volume = {{abs/2109.04120}}, year = {{2021}}, } @inproceedings{28462, author = {{Arias Cabarcos, Patricia and Habrich, Thilo and Becker, Karen and Becker, Christian and Strufe, Thorsten}}, booktitle = {{30th {USENIX} Security Symposium, {USENIX} Security 2021, August 11-13, 2021}}, editor = {{Bailey, Michael and Greenstadt, Rachel}}, pages = {{55--72}}, publisher = {{{USENIX} Association}}, title = {{{Inexpensive Brainwave Authentication: New Techniques and Insights on User Acceptance}}}, year = {{2021}}, } @misc{29540, abstract = {{Autonomous mobile robots are becoming increasingly more capable and widespread. Reliable Obstacle avoidance is an integral part of autonomous navigation. This involves real time interpretation and processing of a complex environment. Strict time and energy constraints of a mobile autonomous system make efficient computation extremely desirable. The benefits of employing Hardware/Software co-designed applications are obvious and significant. Hardware accelerators are used for efficient processing of the algorithms by exploiting parallelism. FPGAs are a class of hardware accelerators, which can contain hundreds of small execution units, and can be used for Hardware/Software co-designed application. However, there is a reluctance when it comes to adoption of these devices in well established application domains, such as Robotics, due to a steep learning curve needed for FPGA application design. ReconROS has successfully bridged the gap between robotic and FPGA application development, by providing an intuitive, common development platform for robotic application development for FPGA. It does so by integrating Robotics Operating System(ROS) which is an industry and academia standard for robotics application development, with ReconOS, an operating system for re-configurable hardware. In this thesis an obstacle avoidance system is designed and implemented for an autonomous vehicle using ReconROS. The objectives of the thesis is to demonstrate and explore ReconROS integration within the ROS ecosystem and explore the design process within ReconROS framework, and to demonstrate the effectiveness of Hardware Acceleration in Robotics, by analysing the resulting architectures for Latency and Power Consumption.}}, author = {{Sheikh, Muhammad Aamir}}, publisher = {{Paderborn University}}, title = {{{Design and Implementation of a ReconROS-based Obstacle Avoidance System}}}, year = {{2021}}, } @unpublished{22764, abstract = {{Robotics applications process large amounts of data in real-time and require compute platforms that provide high performance and energy-efficiency. FPGAs are well-suited for many of these applications, but there is a reluctance in the robotics community to use hardware acceleration due to increased design complexity and a lack of consistent programming models across the software/hardware boundary. In this paper we present ReconROS, a framework that integrates the widely-used robot operating system (ROS) with ReconOS, which features multithreaded programming of hardware and software threads for reconfigurable computers. This unique combination gives ROS2 developers the flexibility to transparently accelerate parts of their robotics applications in hardware. We elaborate on the architecture and the design flow for ReconROS and report on a set of experiments that underline the feasibility and flexibility of our approach.}}, author = {{Lienen, Christian and Platzner, Marco}}, booktitle = {{arXiv:2107.07208}}, pages = {{19}}, title = {{{Design of Distributed Reconfigurable Robotics Systems with ReconROS}}}, year = {{2021}}, } @inproceedings{29590, author = {{Vorbohle, Christian and Gottschalk, Sebastian and Kundisch, Dennis and Engels, Gregor and Wünderlich, Nancy}}, booktitle = {{Tagungsband der contribution at: 17. Internationale Tagung Wirtschaftsinformatik 2022 (WI)}}, location = {{Nürnberg, Germany}}, title = {{{A Procedure Model for Enhancing Ideation in the Collaborative Development of Business Ecosystems}}}, year = {{2021}}, } @article{29699, author = {{Ghasemi, S. Alireza and Kühne, Thomas D.}}, journal = {{The Journal of Chemical Physics}}, number = {{7}}, pages = {{074107}}, title = {{{Artificial neural networks for the kinetic energy functional of non-interacting fermions}}}, doi = {{10.1063/5.0037319}}, volume = {{154}}, year = {{2021}}, } @inproceedings{29707, author = {{Bechinie, Dominik and Eilerts, Katja and Huhmann, Tobias and Lenke, Michael and Schulte, Carsten and Winkelnkemper, Felix}}, booktitle = {{Beiträge zum Mathematikunterricht 2021}}, publisher = {{WTM Verlag, Münster}}, title = {{{Geometrielernen digital unterstützen - Räumliche Kompetenzen und individuelle Lernwege mittels adaptierbarer algorithmischer Rückmeldemöglichkeiten fördern}}}, year = {{2021}}, } @inproceedings{22482, author = {{Yigitbas, Enes and Klauke, Jonas and Gottschalk, Sebastian and Engels, Gregor}}, booktitle = {{Proceedings of the 2021 IEEE Symposium on Visual Languages and Human-Centric Computing (VL/HCC) }}, publisher = {{IEEE}}, title = {{{VREUD - An End-User Development Tool to Simplify the Creation of Interactive VR Scenes}}}, year = {{2021}}, } @article{29708, author = {{Gerstenberger, Dietrich Karl-Heinz and Winkelnkemper, Felix and Schulte, Carsten}}, journal = {{9. Fachtagung Hochschuldidaktik Informatik (HDI)}}, pages = {{49}}, title = {{{Nutzung der Personas-Methode zum Umgang mit der Heterogenität von Informatik-Studierenden}}}, year = {{2021}}, } @inproceedings{29715, author = {{Steghofer, Jan-Philipp and Koopmann, Bjorn and Steffen Becker, Jan and Stierand, Ingo and Zeller, Marc and Bonner, Maria and Schmelter, David and Maro, Salome}}, booktitle = {{2021 IEEE 29th International Requirements Engineering Conference (RE)}}, publisher = {{IEEE}}, title = {{{The MobSTr Dataset – An Exemplar for Traceability and Model-based Safety Assessment}}}, doi = {{10.1109/re51729.2021.00062}}, year = {{2021}}, } @phdthesis{27499, author = {{Budde, Lea}}, publisher = {{University of Paderborn, Germany}}, title = {{{Entwicklung und Rekonstruktion einer interaktionsgeprägten Sichtweise auf das komplementäre Mensch-Maschine-Verhältnis}}}, year = {{2021}}, }