@article{40231, author = {{Meier-Gräwe, Uta and Wagenknecht, Inga}}, journal = {{Frühe Kindheit}}, pages = {{24--29}}, publisher = {{Deutsche Liga für das Kind in Familie und Gesellschaft e. V.}}, title = {{{Frühe Hilfen sind eine Zukunftsinvestition}}}, volume = {{14}}, year = {{2012}}, } @inproceedings{40820, abstract = {{An alternating optimization algorithm was recently proposed for the K-user multiple-input multiple-output (MIMO) interference channel. For flat-fading channels and feasible problems, this algorithm successfully aligns the interfering signals exploiting the spatial dimensions. In this paper, we consider the case in which all pairwise MIMO channels are frequency-selective (convolutive), and the users transmit broadband signals using a single-carrier scheme. Unlike the flat-fading case, for frequency-selective channels it is necessary to add a spectral mask in the frequency response of the precoders and decoders to avoid trivial solutions. We show in the paper that each step of the alternating minimization algorithm can be reformulated as a convex optimization problem in which the autocorrelation function of the precoders or decoders is obtained. Upon convergence, a final spectral factorization stage must be applied to obtain the precoders and decoders from their autocorrelation functions. Simulation results are provided to illustrate the performance of the proposed algorithm.}}, author = {{Lameiro, Christian and Vía, Javier and Santamaría, Ignacio and Heath Jr., Robert W.}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Acoustics, Speech and Signal Process.}}, title = {{{Interference Leakage Minimization for Convolutive MIMO Interference Channels}}}, doi = {{10.1109/ICASSP.2012.6288506}}, year = {{2012}}, } @article{40810, abstract = {{This paper considers large multiple-input multiple-output (MIMO) communication systems with linear precoding and linear minimum mean-squared error (LMMSE) equalization based on the iterative conjugate gradient (CG) algorithm. Convergence of the CG algorithm is fast when the eigenvalues of the received signal’s covariance matrix are clustered, suggesting that mean-squared error and receiver complexity can be managed with judicious precoder design. In order to accelerate convergence of an iterative CG receiver, we incorporate constraints on two measures of eigenvalue clustering into the precoder design. Closed-form solutions to the optimal precoders are derived using majorization theory and convex optimization techniques. We show that if there are constraints on receiver complexity, the proposed precoders can improve performance for large MIMO systems operating over slowly time-varying fading channels.}}, author = {{Tong, Jun and Schreier, Peter J. and Weller, Steven R.}}, journal = {{IEEE Trans.\ Wireless Comm.}}, number = {{8}}, pages = {{2828–2837}}, title = {{{Linear precoding for MIMO systems with low-complexity receivers}}}, doi = {{10.1109/TWC.2012.070912.110877}}, volume = {{11}}, year = {{2012}}, } @article{39520, author = {{Brockmeier, A and Rodriguez, F J Santos and Harrison, M and Hilleringmann, Ulrich}}, issn = {{0960-1317}}, journal = {{Journal of Micromechanics and Microengineering}}, keywords = {{Electrical and Electronic Engineering, Mechanical Engineering, Mechanics of Materials, Electronic, Optical and Magnetic Materials}}, number = {{12}}, publisher = {{IOP Publishing}}, title = {{{Surface tension and its role for vertical wet etching of silicon}}}, doi = {{10.1088/0960-1317/22/12/125012}}, volume = {{22}}, year = {{2012}}, } @article{39522, author = {{Brockmeier, A and Rodriguez, F J Santos and Harrison, M and Hilleringmann, Ulrich}}, issn = {{0960-1317}}, journal = {{Journal of Micromechanics and Microengineering}}, keywords = {{Electrical and Electronic Engineering, Mechanical Engineering, Mechanics of Materials, Electronic, Optical and Magnetic Materials}}, number = {{12}}, publisher = {{IOP Publishing}}, title = {{{Surface tension and its role for vertical wet etching of silicon}}}, doi = {{10.1088/0960-1317/22/12/125012}}, volume = {{22}}, year = {{2012}}, } @inproceedings{3980, abstract = {{Paper Abstract High harmonic generation is investigated for a two-band model of a semiconductor nanostructure. Similar to an atomic two-level system, the semiconductor emits high harmonic radiation. We show how one can specifically enhance the emission for a given frequency by applying a non-trivially shaped laser pulse. Therefore, the semiconductor Bloch equations including the interband and additionally the intraband dynamics are solved numerically and the spectral shape of the input pulse is computed via an optimization algorithm. It is demonstrated that desired emission frequencies can be favored even though the overall input power is kept constant. We also suggest special metallic nano geometries to achieve enhanced localized optical fields. They are found by geometric optimization.}}, author = {{Reichelt, Matthias and Hildebrandt, Andre and Walther, Andrea and Förstner, Jens and Meier, Torsten}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XVI}}, isbn = {{9780819489036 }}, keywords = {{tet_topic_shg}}, publisher = {{SPIE}}, title = {{{Engineering high harmonic generation in semiconductors via pulse shaping}}}, doi = {{10.1117/12.906338}}, volume = {{8260}}, year = {{2012}}, } @article{22953, abstract = {{The generation of specific high harmonics for an optical two-level system is elucidated. The desired emitted radiation can be induced by a carefully designed excitation pulse, which is found by a multiparameter optimization procedure. The presented mechanism can also be applied to semiconductor structures for which the calculations result in much higher emission frequencies. The optimization procedure is either performed using a genetic algorithm or a rigorous mathematical optimization technique.}}, author = {{Reichelt, Matthias and Walther, Andrea and Meier, Torsten}}, issn = {{0740-3224}}, journal = {{Journal of the Optical Society of America B}}, number = {{2}}, title = {{{Tailoring the high-harmonic emission in two-level systems and semiconductors by pulse shaping}}}, doi = {{10.1364/josab.29.000a36}}, volume = {{29}}, year = {{2012}}, } @inproceedings{3965, abstract = {{We design the geometrical shape of plasmonic nanostructures to achieve field patterns with desired properties. For this, we combine Maxwell simulations and automatic optimization techniques. By allowing variations of the geometrical shape, which can be based on either boxes or arbitrary polygons, we maximize the desired objective.}}, author = {{Hildebrandt, Andre and Reichelt, Matthias and Meier, Torsten and Förstner, Jens}}, keywords = {{tet_topic_optical antenna, tet_topic_plasmonics}}, location = {{Bad Honnef}}, number = {{59}}, publisher = {{AIP AIP Conference Proceedings 1475}}, title = {{{Optimization of the intensity enhancement in plasmonic nanoantennas}}}, doi = {{10.1063/1.4750095}}, year = {{2012}}, } @article{52225, author = {{Schäfer, Mirko and Wagner, Johannes and Schlüter, Alexander and Hesselbach, Jens}}, issn = {{2305-9974}}, journal = {{SNE Simulation Notes Europe}}, number = {{1}}, pages = {{1--6}}, publisher = {{ARGESIM Arbeitsgemeinschaft Simulation News}}, title = {{{Energy Flows in Industrial Buildings and Machines using the Example of a Node Model}}}, doi = {{10.11128/sne.22.tn.10103}}, volume = {{22}}, year = {{2012}}, } @inproceedings{60458, abstract = {{Digital 3D models are key components in many industrial and scientific sectors. In numerous domains polygonmeshes have become a de facto standard for model representation. In practice meshes often have a number ofdefects and flaws that make them incompatible with quality requirements of specific applications. Hence, repairingsuch defects in order to achieve compatibility is a highly important task - in academic as well as industrial applications. In this tutorial we first systematically analyze typical application contexts together with their requirementsand issues, as well as the various types of defects that typically play a role. Subsequently, we considerexisting techniques to process, repair, and improve the structure, geometry, and topology of imperfect meshes,aiming at making them appropriate to case-by-case requirements. We present seminal works and key algorithms,discuss extensions and improvements, and analyze the respective advantages and disadvantages depending onthe application context. Furthermore, we outline directions where further research is particularly important orpromising.}}, author = {{Campen, Marcel and Attene, Marco and Kobbelt, Leif}}, booktitle = {{Eurographics 2012 Tutorials}}, title = {{{A Practical Guide to Polygon Mesh Repairing}}}, doi = {{10.2312/CONF/EG2012/TUTORIALS/T4}}, year = {{2012}}, } @article{52868, author = {{Grimme, Britta and Lipinski, John and Schöner, Gregor}}, journal = {{Experimental brain research}}, pages = {{185–200}}, publisher = {{Springer}}, title = {{{Naturalistic arm movements during obstacle avoidance in 3D and the identification of movement primitives}}}, volume = {{222}}, year = {{2012}}, } @inproceedings{25421, author = {{Ngonga Ngomo, Axel-Cyrille and Auer, Sören}}, booktitle = {{{IJCAI} 2011, Proceedings of the 22nd International Joint Conference on Artificial Intelligence, Barcelona, Catalonia, Spain, July 16-22, 2011}}, editor = {{Walsh, Toby}}, pages = {{2312--2317}}, publisher = {{{IJCAI/AAAI}}}, title = {{{LIMES - A Time-Efficient Approach for Large-Scale Link Discovery on the Web of Data}}}, doi = {{10.5591/978-1-57735-516-8/IJCAI11-385}}, year = {{2011}}, } @inproceedings{25427, author = {{Shekarpour, Saeedeh and Auer, Sören and Ngonga Ngomo, Axel-Cyrille and Gerber, Daniel and Hellmann, Sebastian and Stadler, Claus}}, booktitle = {{Proceedings of the 2011 {IEEE/WIC/ACM} International Conference on Web Intelligence, {WI} 2011, Campus Scientifique de la Doua, Lyon, France, August 22-27, 2011}}, editor = {{Boissier, Olivier and Benatallah, Boualem and P. Papazoglou, Mike and W. Ras, Zbigniew and Hacid, Mohand-Said}}, pages = {{203--210}}, publisher = {{{IEEE} Computer Society}}, title = {{{Keyword-Driven SPARQL Query Generation Leveraging Background Knowledge}}}, doi = {{10.1109/WI-IAT.2011.70}}, year = {{2011}}, } @inproceedings{26660, abstract = {{During rescue scenarios it is indispensable to obtain an overview of the situation. Unmanned aerial vehicles (UAVs) can gather the necessary information in a fast and efficient way. This paper presents an approach for path planning in 3D environments offering a solution to explore disaster areas including, e.g., partially or completely destroyed buildings. Using multiple UAVs decreases the time needed to receive a complete overview if the problem of coordination and task allocation is solved. We present an approach for the use of multiple UAVs. The UAVs work in a distributed manner without any central coordination instance and cover the exploration of terrains as well as goal-oriented path planning. When using multiple UAVs redundant exploration is avoided through the use of inter-UAV-communication. The approach is based on potential fields and uses the simplicity of the gradient method to calculate paths for fast exploration of the terrain. }}, author = {{Rasche, Christoph and Stern, Claudius and Kleinjohann, Lisa and Kleinjohann, Bernd}}, booktitle = {{The 5th International Conference on Automation, Robotics and Applications (ICARA 2011)}}, title = {{{A Distributed Multi-UAV Path Planning Approach for 3D Environments}}}, year = {{2011}}, } @inproceedings{26699, abstract = {{In this paper, we introduce a test bed for demonstrating and investigating self-x properties, such as self-optimization and self-organization, within the scope of multi-robot societies under realistic conditions. By doing so, we shift the investigation and demonstration of biologically inspired mechanisms from the simulative point of view to a dynamic and more complex realistic environment. For this purpose, we developed a controlled real-world environment to overcome common problems such as self-localization. Furthermore, we elaborated a concept for a descriptive robotic real-world game. By means of this game, we provide an instrument, which is easily accessible for any kind of audience on the one hand, while it still leaves enough space for an extensive scientific investigation on the other hand.}}, author = {{Jungmann, Alexander and Lutterbeck, Jan and Werdehausen, Benjamin and Kleinjohann, Bernd}}, booktitle = {{Proceedings of the 9th IEEE International Conference on Industrial Informatics (INDIN)}}, publisher = {{IEEE}}, title = {{{A Test Bed for Investigating Self-X Properties in Multi-Robot Societies}}}, year = {{2011}}, } @inproceedings{26701, abstract = {{Machines are omnipresent. They produce, they transport. Machines facilitate work and assist. The increasing penetration of mechanical engineering by information technology enables considerable benefits. We refer to such systems as advanced mechatronic systems, which relay on the close interaction of mechanics, electric/electronics, control engineering and software engineering. Hence, the design and production of such systems is an interdisciplinary and complex task. Our ambition is a new school for the design of advanced mechatronic systems. Consequently, we need an avant-garde basic system which can be used to develop and to test future applications. The miniature robot BeBot is such a basic system. This robot constitutes the test bench for the applications, being based on modern approaches, such as self-optimization, self-organization and self-coordination as well as on the use of new manufacturing technologies. }}, author = {{Gausemeier, Jürgen and Schierbaum, Thomas and Dumitrescu, Roman and Herbrechtsmeier, Stefan and Jungmann, Alexander}}, booktitle = {{Proceedings of the 9th IEEE International Conference on Industrial Informatics (INDIN)}}, publisher = {{IEEE}}, title = {{{Miniature Robot BeBot: Mechatronic Test Platform for Self-X Properties}}}, year = {{2011}}, } @inproceedings{26702, author = {{Thuy, Andreas}}, booktitle = {{Reconfigurable Communication-centric Systems-on-Chip (ReCoSoC), 2011 6th International Workshop on }}, publisher = {{IEEE Xplore}}, title = {{{ Comparison of periodic and aperiodic task models for cyber-physical-systems}}}, year = {{2011}}, } @inbook{26783, author = {{Adelt, Philipp and Esau, Natascha and Hölscher, Christian and Kleinjohann, Bernd and Kleinjohann, Lisa and Krüger, Martin and Zimmer, Detmar}}, booktitle = {{ Intelligent Mechatronics; Kapitel 10}}, pages = {{169--194}}, publisher = {{InTech Open Access Publisher}}, title = {{{Hybrid Planning for Self-Optimization in Railbound Mechatronic Systems}}}, year = {{2011}}, } @inproceedings{26794, abstract = {{In this paper we introduce an infrastructure for investigating Organic Computing principles such as self-optimization and self-organization in real-world scenarios based on a heterogeneous society of robots. This infrastructure, the R3PB-Workbench (Remote Real Robots at the University of Paderborn), provides a controlled environment for conducting real-world multi robot experiments, while relieving the developer from common problems like getting a global view of the entire environment and self-localization within this environment. In addition, it provides a communication layer that hides the heterogeneity of the controlled robot types and also facilitates access to each robot's subjective view. Currently we provide three types of mobile robots with different size and capabilities. Since the workbench is easily customizable, it supports the integration of additional types of robots. Hence, the degree of heterogeneity of the robot group conducting the experiments in the scope of our real-world scenario can be modified as needed. Furthermore, we elaborated a multi-robot game as an illustrative real-world scenario, which on the one hand allows for sophisticated scientific investigations and on the other hand is also appealing for an audience, even with little technical background.}}, author = {{Jungmann, Alexander and Lutterbeck, Jan and Werdehausen, Benjamin and Kleinjohann, Bernd and Kleinjohann, Lisa}}, booktitle = {{Proceedings of the 2011 workshop on Organic computing}}, pages = {{41--50}}, publisher = {{ACM}}, title = {{{Towards a Real-World Scenario for Investigating Organic Computing Principles in Heterogeneous Societies of Robots}}}, year = {{2011}}, } @article{26904, author = {{Herbst, Antje and Diethelm, Katharina and Cheng, Guo and Alexy, Ute and Icks, Andrea and Buyken, Anette}}, issn = {{0022-3166}}, journal = {{The Journal of Nutrition}}, pages = {{1348--1354}}, title = {{{Direction of Associations between Added Sugar Intake in Early Childhood and Body Mass Index at Age 7 Years May Depend on Intake Levels}}}, doi = {{10.3945/jn.110.137000}}, year = {{2011}}, }