@article{46394, abstract = {{Meta-heuristics are frequently used to tackle NP-hard combinatorial optimization problems. With this paper we contribute to the understanding of the success of 2-opt based local search algorithms for solving the traveling salesperson problem (TSP). Although 2-opt is widely used in practice, it is hard to understand its success from a theoretical perspective. We take a statistical approach and examine the features of TSP instances that make the problem either hard or easy to solve. As a measure of problem difficulty for 2-opt we use the approximation ratio that it achieves on a given instance. Our investigations point out important features that make TSP instances hard or easy to be approximated by 2-opt.}}, author = {{Mersmann, O and Bischl, B and Trautmann, Heike and Wagner, M and Bossek, Jakob and Neumann, F}}, journal = {{Annals of Mathematics and Artificial Intelligence}}, pages = {{151–182}}, title = {{{A Novel Feature-Based Approach to Characterize Algorithm Performance for the Traveling Salesman Problem}}}, volume = {{69}}, year = {{2013}}, } @book{51490, author = {{Hilgert, Joachim}}, publisher = {{Springer Spektrum}}, title = {{{Arbeitsbuch Mathematik für das erste Studienjahr}}}, year = {{2013}}, } @book{51491, author = {{Hilgert, Joachim}}, publisher = {{Springer Spektrum}}, title = {{{Lesebuch Mathematik für das erste Studienjahr}}}, year = {{2013}}, } @inproceedings{36919, abstract = {{Faced with increasing demands on energy efficiency, current electronic systems operate according to complex power management schemes including more and more fine-grained voltage frequency scaling and power shutdown scenarios. Consequently, validation of the power design intent should begin as early as possible at electronic system-level (ESL) together with first executable system specifications for integrity tests. However, today's system-level design methodologies usually focus on the abstraction of digital logic and time, so that typical low-power aspects cannot be considered so far. In this paper, we present a high-level modeling approach on top of the SystemC/TLM standard to simulate power distribution and voltage based implications in a "loosely-timed" functional execution context. The approach reuses legacy TLM models and prevents the need for detailed lock-step process synchronization in contrast to existing methods. A case study derived from an open source low-power design demonstrates the efficiency of our approach in terms of simulation performance and testability.}}, author = {{Mischkalla, Fabian and Müller, Wolfgang}}, keywords = {{Time-varying systems, Time-domain analysis, Synchronization, Context modeling, Clocks, Semantics, Standards}}, publisher = {{IEEE}}, title = {{{Efficient Power-Intent Validation Using "Loosely-Timed" Simulation Models: A Non-Invasive Approach}}}, doi = {{10.1109/PATMOS.2013.6662171}}, year = {{2013}}, } @inproceedings{36920, abstract = {{In the electronic system development, energy consumption is clearly becoming one of the most important design concerns. From the system level point of view, Dynamic Power Management (DPM) and Dynamic Voltage and Frequency Scaling (DVFS) are two mostly applied techniques to adjust the tradeoff between the performance and power dissipation at runtime. In this paper, we study the problem of combined application of both techniques with regard to hard real-time systems running on cluster-based multi-core processors. To optimize the processor energy consumption, a heuristic based on simulated annealing with efficient termination criterion is proposed. The experiment results show that the proposed algorithm outperforms the existing approaches in terms of the energy reduction. }}, author = {{He, Da and Müller, Wolfgang}}, booktitle = {{Proceedings of the International Conference on Applied Computing (AC)}}, editor = {{Weghorn, Hans}}, isbn = {{978-989-8533-20-3 }}, keywords = {{Dynamic Power Management, Dynamic Voltage and Frequency Scaling, Hard Real-Time, Multi-core Processor}}, title = {{{An Energy-Efficient Heuristic for Hard Real-Time System on Multi-Core Processors}}}, year = {{2013}}, } @article{35717, abstract = {{Engineering faculties generally involve their students in the creation of numerous scientific works and publications. However, students are rarely trained in this area and could well benefit from targeted support: to this end, we propose a specific lecture that addresses the subtleties of scientific research and writing and allows the students to apply and mentally anchor their acquired knowledge while composing a basic scientific term paper.}}, author = {{Temmen, Katrin and Walther, Thomas}}, issn = {{2192-4880}}, journal = {{International Journal of Engineering Pedagogy (iJEP)}}, keywords = {{General Engineering, Education}}, number = {{3}}, publisher = {{International Association of Online Engineering (IAOE)}}, title = {{{Learning by Doing – Improving Academic Skills}}}, doi = {{10.3991/ijep.v3i3.2827}}, volume = {{3}}, year = {{2013}}, } @inproceedings{35715, author = {{Temmen, Katrin and Walther, T.}}, booktitle = {{2013 IEEE Global Engineering Education Conference (EDUCON)}}, publisher = {{IEEE}}, title = {{{'Learning by doing' Improving academic skills}}}, doi = {{10.1109/educon.2013.6530095}}, year = {{2013}}, } @inbook{37270, author = {{Temmen, Katrin}}, booktitle = {{Didaktik im Fokus}}, pages = {{187--202}}, publisher = {{Schneider Verlag}}, title = {{{Auf die Studierenden hören: Einsatz von Schülerlaboren in der Lehramtsausbildung}}}, year = {{2013}}, } @article{37283, author = {{Gerholz, K.-H. and Bödeker, J. and Eberhardt, A. and Kerstingtombroke, D. and Langeleh, D. and Temmen, Katrin}}, journal = {{Wirtschaft und Erziehung}}, pages = {{64--69}}, title = {{{Lehrerbildung praxisorientiert gestalten - Das Projekt InnoTrans Uni-BK}}}, year = {{2013}}, } @article{31298, author = {{Barkhofen, Sonja and Weich, Tobias and Potzuweit, A. and Stöckmann, H.-J. and Kuhl, U. and Zworski, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{Experimental Observation of the Spectral Gap in Microwave n-Disk Systems}}}, doi = {{10.1103/physrevlett.110.164102}}, volume = {{110}}, year = {{2013}}, } @inproceedings{38426, author = {{Koch, B. and Noé, Reinhold and Mirvoda, V. and Sandel, D.}}, booktitle = {{2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)}}, isbn = {{978-1-55752-962-6; 978-1-4799-0457-0}}, title = {{{First Endless Optical Polarization and Phase Tracker}}}, year = {{2013}}, } @article{38411, author = {{Koch, B. and Noé, Reinhold and Mirvoda, V. and Sandel, D.}}, issn = {{0013-5194}}, journal = {{ELECTRONICS LETTERS}}, number = {{7}}, pages = {{483--484}}, title = {{{20 krad/s endless optical polarisation and phase control}}}, doi = {{10.1049/el.2013.0485}}, volume = {{49}}, year = {{2013}}, } @inproceedings{38402, author = {{Puntsri, K. and Jan, O. and Al-Bermani, A. and Woerdehoff, C. and Sandel, D. and Hussin, S. and Panhwar, M. F. and Noé, Reinhold and Rueckert, U.}}, booktitle = {{2013 OPTICAL FIBER COMMUNICATION CONFERENCE AND EXPOSITION AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE (OFC/NFOEC)}}, isbn = {{978-1-55752-962-6; 978-1-4799-0457-0}}, title = {{{An Ultralow Complexity Algorithm for Frame Synchronization and IQ Alignment in CO-OFDM Systems}}}, year = {{2013}}, } @article{38319, author = {{Koch, Benjamin and Noé, Reinhold and Sandel, David and Mirvoda, Vitali and Omar, Jan and Puntsri, Kidsanapong}}, issn = {{1041-1135}}, journal = {{IEEE PHOTONICS TECHNOLOGY LETTERS}}, number = {{9}}, pages = {{798--801}}, title = {{{20-Gb/s PDM-RZ-DPSK Transmission With 40 krad/s Endless Optical Polarization Tracking}}}, doi = {{10.1109/LPT.2013.2251877}}, volume = {{25}}, year = {{2013}}, } @inproceedings{38263, author = {{Puntsri, Kidsanapong and Jan, Omar and Al-Bermani, Ali and Woerdehoff, Christian and Sandel, David and Panhwar, Muhammad Fawad and Hussin, Saleh and Rueckert, Ulrich and Noé, Reinhold}}, booktitle = {{2013 ITG Symposium Proceedings - Photonic Networks}}, pages = {{1--4}}, title = {{{ISI Tolerance of Cyclic Prefix Free Coherent Optical OFDM Communication systems}}}, year = {{2013}}, } @article{38236, author = {{Hussin, Saleh and Puntsri, Kidsanapong and Noé, Reinhold}}, journal = {{IEEE Photonics Technology Letters}}, number = {{12}}, pages = {{1099--1102}}, title = {{{Analysis of Partial Pilot Filling Phase Noise Compensation for CO-OFDM Systems}}}, doi = {{10.1109/LPT.2013.2258332}}, volume = {{25}}, year = {{2013}}, } @article{38230, author = {{Koch, Benjamin and Noé, Reinhold and Sandel, David and Mirvoda, Vitali and Omar, Jan and Puntsri, Kidsanapong}}, journal = {{IEEE Photonics Technology Letters}}, number = {{9}}, pages = {{798--801}}, title = {{{20-Gb/s PDM-RZ-DPSK Transmission With 40 krad/s Endless Optical Polarization Tracking}}}, doi = {{10.1109/LPT.2013.2251877}}, volume = {{25}}, year = {{2013}}, } @article{37672, abstract = {{AbstractLet ${F}_{BC} (\lambda , k; t)$ be the Heckman–Opdam hypergeometric function of type BC with multiplicities $k= ({k}_{1} , {k}_{2} , {k}_{3} )$ and weighted half-sum $\rho (k)$ of positive roots. We prove that ${F}_{BC} (\lambda + \rho (k), k; t)$ converges as ${k}_{1} + {k}_{2} \rightarrow \infty $ and ${k}_{1} / {k}_{2} \rightarrow \infty $ to a function of type A for $t\in { \mathbb{R} }^{n} $ and $\lambda \in { \mathbb{C} }^{n} $. This limit is obtained from a corresponding result for Jacobi polynomials of type BC, which is proven for a slightly more general limit behavior of the multiplicities, using an explicit representation of Jacobi polynomials in terms of Jack polynomials. Our limits include limit transitions for the spherical functions of non-compact Grassmann manifolds over one of the fields $ \mathbb{F} = \mathbb{R} , \mathbb{C} , \mathbb{H} $ when the rank is fixed and the dimension tends to infinity. The limit functions turn out to be exactly the spherical functions of the corresponding infinite-dimensional Grassmann manifold in the sense of Olshanski.}}, author = {{Rösler, Margit and Koornwinder, Tom and Voit, Michael}}, issn = {{0010-437X}}, journal = {{Compositio Mathematica}}, keywords = {{Algebra and Number Theory}}, number = {{8}}, pages = {{1381--1400}}, publisher = {{Wiley}}, title = {{{Limit transition between hypergeometric functions of type BC and type A}}}, doi = {{10.1112/s0010437x13007045}}, volume = {{149}}, year = {{2013}}, } @article{38038, author = {{Rösler, Margit and Voit, Michael}}, journal = {{Journal of Lie Theory 23}}, number = {{4}}, pages = {{899----920}}, publisher = {{Heldermann }}, title = {{{Olshanski spherical functions for infinite dimensional motion groups of fixed rank}}}, doi = {{10.48550/ARXIV.1210.1351}}, year = {{2013}}, } @inproceedings{24351, abstract = {{We demonstrate the first 80 Gb/s decision feedback equalizer in various electrical and optical applications. The device, designed in SiGe:C BiCMOS 0.13 μm technology, enables error-free data recovery of heavily distorted signals transmitted at a bandwidth less than 30% of their bit rate. The fastest nonlinear electrical equalizer reported yet utilizes a novel 1-tap look-ahead architecture.}}, author = {{Möller, Lothar and Awny, Ahmed and Junio, Josef and Scheytt, Christoph and Thiede, Andreas}}, booktitle = {{Optical Fiber Communication Conference}}, title = {{{80 Gb/s Decision Feedback Equalizer for Intersymbol Interference}}}, doi = {{10.1364/OFC.2013.OW4B.2 }}, year = {{2013}}, }