@phdthesis{30636, abstract = {{ Begrenzte Vorräte fossiler Energiequellen beeinflussen die individuelle Mobilität von heute und morgen. Eine Schlüsseltechnologie, um dieses Energieproblem zu lösen, ist das batteriebetriebene Elektrofahrzeug (BEV). Der „Flaschenhals“ des BEV in Bezug auf Reichweite und Kosten pro Kapazität ist die Batterie. Diese Arbeit beschreibt die Entwicklung eines Fahrzeugenergiemanagements für ein BEV zur Reduzierung dieses „Flaschenhalses“. Das heißt im speziellen diskutiert sie eine neuartige Lastmanagementstrategie: Diese soll die Energieverluste am Innenwiderstand der Traktionsbatterie reduzieren, um so die Reichweite pro installierter Batterie-Kapazität zu erhöhen. Dafür soll das Lastmanagement den Batteriestrom glätten, es verhält sich also wie ein „virtueller Kondensator“. Die Stromschwankungen um den Mittelwert des Batteriestroms werden reduziert, indem die einzelnen Lasten balanciert werden. Die reduzierte Belastung der Batterie, durch Reduzierung von Spitzenströmen und Stromschwankungen im Allgemeinen, könnte die Lebensdauer der Batterie erhöhen und zu weniger restriktiven Anforderung an die Leistungsdichte der Batterie führen, zum Vorteil einer höheren Energiedichte (diese wiederum bedeutet eine höhere Reichweite oder niedrigere Batterie-Kosten). Um einen geglätteten Batteriestrom zu erreichen, wurde eine neuartige Entwurfsmethodik entwickelt. Dabei kommt die Methode der „Quantitative Feedback Theory“ zum Einsatz, für den Entwurf eines robust-stabilen MIMO-Reglers in der Gegenwart von parametrischen Unsicherheiten und Nichtlinearitäten der Regelstrecke. Im Prototypen-Fahrzeug beeinflusst der MIMO-Regler die elektrische Heizung zur Erwärmung der Fahrgastzelle, sowie die größte elektrische Last: den Antriebsstrang selbst. Theoretisch wird eine Reichweitenerhöhung von bis zu 3,462 % im Prototypen erreicht. Während die Heizung für die Beeinflussung prädestiniert ist, aufgrund der hohen Zeitkonstante zur Erwärmung der Fahrgastzelle, ist demgegenüber der Einfluss auf den Antriebsstrang kritisch in Bezug auf die Fahrerakzeptanz. Daher muss der Einfluss der Funktion auf ein Maß beschränkt sein, das der Fahrer akzeptiert. Dies wird mit einer Fahrerakzeptanzstudie untermauert. }}, author = {{Masjosthusmann, C.}}, isbn = {{978-3-8440-6047-8}}, title = {{{Ein neuartiger Ansatz der robusten Regelung für das Lastmanagement in batteriebetriebenen Elektrofahrzeugen}}}, doi = {{10.2370/9783844060478}}, year = {{2018}}, } @phdthesis{30635, author = {{Bach-Preckwinkel, H.}}, title = {{{Zentralwechselrichter in der Photovoltaik}}}, doi = {{10.17619/UNIPB/1-283}}, year = {{2018}}, } @phdthesis{30857, author = {{Tao, J.}}, title = {{{Half-Cycle-Sampled Discrete Model of Series-Parallel Resonant Converter with Optimized Modulation and Its Control Design}}}, doi = {{10.17619/UNIPB/1-284}}, year = {{2018}}, } @inproceedings{31946, author = {{Nührenbörger, M. and Bönig, D. and Häsel-Weide, Uta and Korff, N. and Scherer, P.}}, booktitle = {{Beiträge zum Mathematikunterricht 2018. Vorträge zur Mathematikdidaktik und zur Schnittstelle Mathematik/Mathematikdidaktik auf der gemeinsamen Jahrestagung der GDM und DMV}}, editor = {{In:, Fachgruppe Didaktik der Mathematik der Universität Paderborn}}, pages = {{103--104}}, title = {{{Inklusiver Mathematikunterricht - vernetzt zwischen Mathematikdidaktik und Sonderpädagogik}}}, year = {{2018}}, } @article{31953, author = {{Moser-Opitz, E. and Grob, U. and Wittich, C. and Häsel-Weide, Uta and Nührenbörger, M.}}, journal = {{Learning Disabilities: A Contemporary Journal}}, number = {{16}}, pages = {{19--35}}, title = {{{Fostering the Computation Competence of Low Achievers through Cooperative Learning in Inclusive Classrooms: A Longitudinal Study}}}, year = {{2018}}, } @misc{31952, author = {{Häsel-Weide, Uta and Nührenbörger, M. and Reinold, M.}}, isbn = {{978-3122009977}}, pages = {{144}}, publisher = {{Klett}}, title = {{{Förderkommentar Lernen zum Zahlenbuch 3}}}, year = {{2018}}, } @misc{31951, author = {{Häsel-Weide, Uta and Nührenbörger, M. and Reinold, M.}}, isbn = {{978-3122009939}}, pages = {{80}}, publisher = {{Klett}}, title = {{{Das Zahlenbuch 3. Förderheft.}}}, year = {{2018}}, } @article{34664, author = {{Black, Tobias}}, issn = {{0036-1410}}, journal = {{SIAM Journal on Mathematical Analysis}}, keywords = {{Applied Mathematics, Computational Mathematics, Analysis}}, number = {{4}}, pages = {{4087--4116}}, publisher = {{Society for Industrial & Applied Mathematics (SIAM)}}, title = {{{Global Very Weak Solutions to a Chemotaxis-Fluid System with Nonlinear Diffusion}}}, doi = {{10.1137/17m1159488}}, volume = {{50}}, year = {{2018}}, } @article{34666, author = {{Black, Tobias}}, issn = {{0022-0396}}, journal = {{Journal of Differential Equations}}, keywords = {{Analysis, Applied Mathematics}}, number = {{5}}, pages = {{2296--2339}}, publisher = {{Elsevier BV}}, title = {{{Eventual smoothness of generalized solutions to a singular chemotaxis-Stokes system in 2D}}}, doi = {{10.1016/j.jde.2018.04.035}}, volume = {{265}}, year = {{2018}}, } @article{34667, author = {{Black, Tobias}}, issn = {{0362-546X}}, journal = {{Nonlinear Analysis}}, keywords = {{Applied Mathematics, Analysis}}, pages = {{129--153}}, publisher = {{Elsevier BV}}, title = {{{Global solvability of chemotaxis–fluid systems with nonlinear diffusion and matrix-valued sensitivities in three dimensions}}}, doi = {{10.1016/j.na.2018.10.003}}, volume = {{180}}, year = {{2018}}, } @misc{5417, abstract = {{Molecular Dynamic (MD) simulations are computationally intensive and accelerating them using specialized hardware is a topic of investigation in many studies. One of the routines in the critical path of MD simulations is the three-dimensional Fast Fourier Transformation (FFT3d). The potential in accelerating FFT3d using hardware is usually bound by bandwidth and memory. Therefore, designing a high throughput solution for an FPGA that overcomes this problem is challenging. In this thesis, the feasibility of offloading FFT3d computations to FPGA implemented using OpenCL is investigated. In order to mask the latency in memory access, an FFT3d that overlaps computation with communication is designed. The implementa- tion of this design is synthesized for the Arria 10 GX 1150 FPGA and evaluated with the FFTW benchmark. Analysis shows a better performance using FPGA over CPU for larger FFT sizes, with the 643 FFT showing a 70% improvement in runtime using FPGAs. This FFT3d design is integrated with CP2K to explore the potential in accelerating molecular dynamic simulations. Evaluation of CP2K simulations using FPGA shows a 41% improvement in runtime in FFT3d computations over CPU for larger FFT3d designs.}}, author = {{Ramaswami, Arjun}}, keywords = {{FFT: FPGA, CP2K, OpenCL}}, publisher = {{Universität Paderborn}}, title = {{{Accelerating Molecular Dynamic Simulations by Offloading Fast Fourier Transformations to FPGA}}}, year = {{2018}}, } @inproceedings{29460, abstract = {{STT-RAM cells can be considered as an alternative or a hybrid addition to today's SRAM-based cache memories. This is mostly because of their scalability and low leakage power. Moreover, their data storing mechanism (storing the value as resistance) makes them very suitable and applicable for multivalue cache architectures. This feature results in system performance enhancement without any area overhead. On the other hand, the required two-step read/write procedure in multilevel cells results in a non-uniform time access and energy and power overhead on the system. In this paper, we propose a new architecture to dynamically swap data between soft (fast read access) and hard (slow read access) bits in ML cell. Moreover, by reconfiguring cache block size, the proposed architecture can switch between ML and SL modes at runtime. In other words, the swapping method places the hot part of each cache block into soft-bits and the less accessed part into the hard-bits. The SL/ML switching method benefits from the low latency and energy of SL mode and the high storing capacity of ML mode at the same time. Although experimental results show that our proposed method slightly increases the miss rate compared with the conventional ML caches, the performance and energy are improved by 4.9% and 6.5%, respectively. Also, the storage overhead of our method is about 1% that is negligible.}}, author = {{Rezaeizadeh Rookerd, Ramin and Sadeghi-Kohan, Somayeh and Navabi, Zainalabedin}}, booktitle = {{Proceedings of the 2018 on Great Lakes Symposium on VLSI}}, publisher = {{ACM}}, title = {{{Performance and Energy Enhancement through an Online Single/Multi Level Mode Switching Cache Architecture}}}, doi = {{10.1145/3194554.3194599}}, year = {{2018}}, } @article{8753, abstract = {{In a wide range of applications it is desirable to optimally control a dynamical system with respect to concurrent, potentially competing goals. This gives rise to a multiobjective optimal control problem where, instead of computing a single optimal solution, the set of optimal compromises, the so-called Pareto set, has to be approximated. When the problem under consideration is described by a partial differential equation (PDE), as is the case for fluid flow, the computational cost rapidly increases and makes its direct treatment infeasible. Reduced order modeling is a very popular method to reduce the computational cost, in particular in a multi query context such as uncertainty quantification, parameter estimation or optimization. In this article, we show how to combine reduced order modeling and multiobjective optimal control techniques in order to efficiently solve multiobjective optimal control problems constrained by PDEs. We consider a global, derivative free optimization method as well as a local, gradient-based approach for which the optimality system is derived in two different ways. The methods are compared with regard to the solution quality as well as the computational effort and they are illustrated using the example of the flow around a cylinder and a backward-facing-step channel flow.}}, author = {{Peitz, Sebastian and Ober-Blöbaum, Sina and Dellnitz, Michael}}, issn = {{0167-8019}}, journal = {{Acta Applicandae Mathematicae}}, number = {{1}}, pages = {{171–199}}, title = {{{Multiobjective Optimal Control Methods for the Navier-Stokes Equations Using Reduced Order Modeling}}}, doi = {{10.1007/s10440-018-0209-7}}, volume = {{161}}, year = {{2018}}, } @inproceedings{29425, author = {{Jiménez, F. and Ober-Blöbaum, Sina}}, booktitle = {{6th European Conference on Computational Mechanics}}, title = {{{Necessary optimality conditions for optimally controlled dissipative mechanical systems modelled through fractional derivatives}}}, year = {{2018}}, } @inproceedings{29427, author = {{Jiménez, F. and Ober-Blöbaum, Sina}}, booktitle = {{6th IFAC Workshop on Lagrangian and Hamiltonian Methods for Nonlinear Control LHMNC 2018}}, pages = {{50--55}}, title = {{{A fractional variational approach for modelling dissipative mechanical systems continuous and discrete settings}}}, volume = {{51(3)}}, year = {{2018}}, } @inproceedings{30632, author = {{Vogt, Thorsten and Badeda, Julia and Böcker, Joachim and Sauer, Dirk Uwe}}, booktitle = {{2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS)}}, publisher = {{IEEE}}, title = {{{Consideration on primary control reserve provision by industrial microgrids in grid-coupled operation}}}, doi = {{10.1109/peds.2017.8289189}}, year = {{2018}}, } @inproceedings{11710, author = {{Chen, Wei-Fan and Wachsmuth, Henning and Al Khatib, Khalid and Stein, Benno}}, booktitle = {{Proceedings of the 11th International Conference on Natural Language Generation}}, pages = {{79--88}}, publisher = {{Association for Computational Linguistics}}, title = {{{Learning to Flip the Bias of News Headlines}}}, year = {{2018}}, } @inproceedings{14873, author = {{Chen, Wei-Fan and Hagen, Matthias and Stein, Benno and Potthast, Martin}}, booktitle = {{Proceedings of the 41st International ACM SIGIR Conference on Research & Development in Information Retrieval}}, pages = {{1033--1036}}, title = {{{A User Study on Snippet Generation: Text Reuse vs. Paraphrases}}}, year = {{2018}}, } @inproceedings{14885, author = {{Potthast, Martin and Chen, Wei-Fan and Hagen, Matthias and Stein, Benno}}, booktitle = {{Proceedings of the Second International Workshop on Recent Trends in News Information Retrieval}}, pages = {{3--5}}, title = {{{A Plan for Ancillary Copyright: Original Snippets.}}}, year = {{2018}}, } @inproceedings{4575, author = {{Sprenger, Alexander and Hellebrand, Sybille}}, booktitle = {{2018 IEEE 21st International Symposium on Design and Diagnostics of Electronic Circuits & Systems (DDECS)}}, isbn = {{9781538657546}}, publisher = {{IEEE}}, title = {{{Tuning Stochastic Space Compaction to Faster-than-at-Speed Test}}}, doi = {{10.1109/ddecs.2018.00020}}, year = {{2018}}, }