TY - JOUR AB - In this article we show that the boundary of the Pareto critical set of an unconstrained multiobjective optimization problem (MOP) consists of Pareto critical points of subproblems where only a subset of the set of objective functions is taken into account. If the Pareto critical set is completely described by its boundary (e.g., if we have more objective functions than dimensions in decision space), then this can be used to efficiently solve the MOP by solving a number of MOPs with fewer objective functions. If this is not the case, the results can still give insight into the structure of the Pareto critical set. AU - Gebken, Bennet AU - Peitz, Sebastian AU - Dellnitz, Michael ID - 10595 IS - 4 JF - Journal of Global Optimization SN - 0925-5001 TI - On the hierarchical structure of Pareto critical sets VL - 73 ER - TY - CONF AB - In comparison to classical control approaches in the field of electrical drives like the field-oriented control (FOC), model predictive control (MPC) approaches are able to provide a higher control performance. This refers to shorter settling times, lower overshoots, and a better decoupling of control variables in case of multi-variable controls. However, this can only be achieved if the used prediction model covers the actual behavior of the plant sufficiently well. In case of model deviations, the performance utilizing MPC remains below its potential. This results in effects like increased current ripple or steady state setpoint deviations. In order to achieve a high control performance, it is therefore necessary to adapt the model to the real plant behavior. When using an online system identification, a less accurate model is sufficient for commissioning of the drive system. In this paper, the combination of a finite-control-set MPC (FCS-MPC) with a system identification is proposed. The method does not require high-frequency signal injection, but uses the measured values already required for the FCS-MPC. An evaluation of the least squares-based identification on a laboratory test bench showed that the model accuracy and thus the control performance could be improved by an online update of the prediction models. AU - Hanke, Soren AU - Peitz, Sebastian AU - Wallscheid, Oliver AU - Böcker, Joachim AU - Dellnitz, Michael ID - 10597 SN - 9781538694145 T2 - 2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE) TI - Finite-Control-Set Model Predictive Control for a Permanent Magnet Synchronous Motor Application with Online Least Squares System Identification ER - TY - JOUR AU - Khan, Gohar Feroz AU - Trier, Matthias ID - 10792 IS - 4 JF - European Journal of Information Systems SN - 0960-085X TI - Assessing the long-term fragmentation of information systems research with a longitudinal multi-network analysis VL - 28 ER - TY - CONF AU - Potthast, Martin AU - Gienapp, Lukas AU - Euchner, Florian AU - Heilenkötter, Nick AU - Weidmann, Nico AU - Wachsmuth, Henning AU - Stein, Benno AU - Hagen, Matthias ID - 11709 T2 - 42nd International ACM Conference on Research and Development in Information Retrieval (SIGIR 2019) TI - Argument Search: Assessing Argument Relevance ER - TY - GEN AU - Wachsmuth, Henning ID - 11713 IS - 3 T2 - Computational Linguistics TI - Book Review: Argumentation Mining VL - 45 ER - TY - CONF AU - Ajjour, Yamen AU - Wachsmuth, Henning AU - Kiesel, Johannes AU - Potthast, Martin AU - Hagen, Matthias AU - Stein, Benno ID - 11714 T2 - Proceedings of the 42nd Edition of the German Conference on Artificial Intelligence TI - Data Acquisition for Argument Search: The args.me Corpus ER - TY - JOUR AB - Advances in electromyographic (EMG) sensor technology and machine learning algorithms have led to an increased research effort into high density EMG-based pattern recognition methods for prosthesis control. With the goal set on an autonomous multi-movement prosthesis capable of performing training and classification of an amputee’s EMG signals, the focus of this paper lies in the acceleration of the embedded signal processing chain. We present two Xilinx Zynq-based architectures for accelerating two inherently different high density EMG-based control algorithms. The first hardware accelerated design achieves speed-ups of up to 4.8 over the software-only solution, allowing for a processing delay lower than the sample period of 1 ms. The second system achieved a speed-up of 5.5 over the software-only version and operates at a still satisfactory low processing delay of up to 15 ms while providing a higher reliability and robustness against electrode shift and noisy channels. AU - Boschmann, Alexander AU - Agne, Andreas AU - Thombansen, Georg AU - Witschen, Linus Matthias AU - Kraus, Florian AU - Platzner, Marco ID - 11950 JF - Journal of Parallel and Distributed Computing KW - High density electromyography KW - FPGA acceleration KW - Medical signal processing KW - Pattern recognition KW - Prosthetics SN - 0743-7315 TI - Zynq-based acceleration of robust high density myoelectric signal processing VL - 123 ER - TY - CHAP AU - Senft, Björn AU - Rittmeier, Florian AU - Fischer, Holger Gerhard AU - Oberthür, Simon ID - 11952 SN - 0302-9743 T2 - Design, User Experience, and Usability. Practice and Case Studies TI - A Value-Centered Approach for Unique and Novel Software Applications ER - TY - JOUR AB - As flexible optical devices that can manipulate the phase and amplitude of light, metasurfaces would clearly benefit from directional optical properties. However, single layer metasurface systems consisting of two-dimensional nanoparticle arrays exhibit only a weak spatial asymmetry perpendicular to the surface and therefore have mostly symmetric transmission features. Here, we present a metasurface design principle for nonreciprocal polarization encryption of holographic images. Our approach is based on a two-layer plasmonic metasurface design that introduces a local asymmetry and generates a bidirectional functionality with full phase and amplitude control of the transmitted light. The encoded hologram is designed to appear in a particular linear cross-polarization channel, while it is disappearing in the reverse propagation direction. Hence, layered metasurface systems can feature asymmetric transmission with full phase and amplitude control and therefore expand the design freedom in nanoscale optical devices toward asymmetric information processing and security features for anticounterfeiting applications. AU - Frese, Daniel AU - Wei, Qunshuo AU - Wang, Yongtian AU - Huang, Lingling AU - Zentgraf, Thomas ID - 11953 IS - 6 JF - Nano Letters SN - 1530-6984 TI - Nonreciprocal Asymmetric Polarization Encryption by Layered Plasmonic Metasurfaces VL - 19 ER - TY - JOUR AU - Li, Tianyou AU - Wei, Qunshuo AU - Reineke, Bernhard AU - Walter, Felicitas AU - Wang, Yongtian AU - Zentgraf, Thomas AU - Huang, Lingling ID - 11955 IS - 15 JF - Optics Express SN - 1094-4087 TI - Reconfigurable metasurface hologram by utilizing addressable dynamic pixels VL - 27 ER -