@techreport{557, abstract = {{Since the last two decades, the water consumption in Germany is decreasing, which causes the water tanks and pipes in a water supply system to work inefficiently. This paper proposes an approach for a decision support system, which helps to decide how to plan new water tanks and resize existing tanks in water supply systems. The approach uses a combination of network reduction, mathematical optimization and hydraulic simulation. The mathematical optimization model is a nonconvex Mixed Integer Quadratically Constrained Program (MIQCP), which is solved by a piecewise linearization. As this may lead to many binary variables and therefore high computational times, the size of the water supply system model is reduced before building the optimization model. By applying several network reduction techniques there may occur some hydraulic differences between the original network model and the reduced network model. To make sure that the solution obtained in the optimization process is feasible in the original water supply system, the solution is verified by a hydraulic simulation tool.}}, author = {{Hallmann, Corinna}}, publisher = {{Universität Paderborn}}, title = {{{An Approach for a Decision Support Systems to optimize Water Tanks in Water Supply Systems by combining Network Reduction, Optimization and Simulation}}}, year = {{2013}}, } @inproceedings{559, abstract = {{Distributed hash tables are very versatile to use, as distributed storage is a desirable feature for various applications. Typical structured overlays like Chord, Pastry or Kademlia consider only homogeneous nodes with equal capacities, which does not resemble reality. In a practical use case, nodes might get overloaded by storing popular data. In this paper, we present a general approach to enable capacity awareness and load-balancing capability of homogeneous structured overlays. We introduce a hierarchical second structured overlay aside, which allows efficient capacity-based access on the nodes in the system as hosting mirrors. Simulation results show that the structured overlay is able to store various contents, such as of a social network, with only a negligible number of overloaded peers. Content, even if very popular, is hosted by easily findable capable peers. Thus, long-existing and well-evaluated overlays like Chord or Pastry can be used to create attractive DHT-based applications.}}, author = {{Wette, Philip and Graffi, Kalman}}, booktitle = {{Proceedings of the Conference on Networked Systems (NetSys)}}, pages = {{35--42}}, title = {{{Adding Capacity-Aware Storage Indirection to Homogeneous Distributed Hash Tables}}}, doi = {{10.1109/NetSys.2013.9}}, year = {{2013}}, } @inproceedings{10745, author = {{Toebermann, Christian and Geibel, Daniel and Hau, Manuel and Brandl, Ron and Kaufmann, Paul and Ma, Chenjie and Braun, Martin and Degner, Tobias}}, booktitle = {{Real-Time Conference}}, publisher = {{OPAL RT Paris}}, title = {{{Real-Time Simulation of Distribution Grids with high Penetration of Regenerative and Distributed Generation}}}, year = {{2013}}, } @inproceedings{12064, author = {{Sommer, Christoph and Joerer, Stefan and Dressler, Falko}}, booktitle = {{2012 IEEE Vehicular Networking Conference (VNC)}}, isbn = {{9781467349963}}, title = {{{On the applicability of Two-Ray path loss models for vehicular network simulation}}}, doi = {{10.1109/vnc.2012.6407446}}, year = {{2013}}, } @inproceedings{15094, author = {{Böttcher, Stefan and Brandenburg, Marc and Hartel, Rita}}, booktitle = {{WEBIST 2013 - Proceedings of the 9th International Conference on Web Information Systems and Technologies}}, pages = {{137--140}}, publisher = {{SciTePress}}, title = {{{DAG - Index - A Compressed Index for XML Keyword Search}}}, year = {{2013}}, } @book{1626, author = {{Krimphove, Dieter}}, pages = {{266}}, publisher = {{Verlag Kovač}}, title = {{{"Ihr betet an, was ihr nicht kennt" (Jo 4, 22) - Eine neue Sicht auf die Trinität }}}, year = {{2013}}, } @inproceedings{16340, abstract = {{Today’s simulation software normally has fixed, built-in editing and visualization views adapted to a specific problem domain. Often this monolithic concept prevents collaborative editing altogether. Even with more flexible concepts, editing simulation models with a heterogeneous set of clients is not possible. In this article we describe a flexible concept for collaborative editing of simulation models with heterogeneous clients, such as web-based, desktop and mobile clients. The clients may even show different editing views adapted to the user’s role. The concept we describe in this paper overcomes several problems: First we need to be able to connect and manage a set of heterogeneous clients in the simulation software. The very different user inputs from the connected clients then need to be processed, interpreted and combined to allow editing in a collaborative way for all users. At last we show a prototypical integration of the presented concept into our research platform d3fact.}}, author = {{Renken, Hendrik and Brandt, Sascha and Eichert, Felix A. and Klaas, Alexander}}, booktitle = {{Volume 2: 32nd Computers and Information in Engineering Conference, Parts A and B}}, isbn = {{9780791845011}}, location = {{Chicago, Illinois, USA}}, pages = {{1491--1500}}, title = {{{Visualization and Collaborative Editing of Simulation Models With Heterogeneous Clients: Implemented Into the Simulator D3FACT}}}, doi = {{10.1115/detc2012-71370}}, volume = {{2}}, year = {{2013}}, } @inproceedings{16393, abstract = {{Many 3D scenes (e.g. generated from CAD data) are composed of a multitude of objects that are nested in each other. A showroom, for instance, may contain multiple cars and every car has a gearbox with many gearwheels located inside. Because the objects occlude each other, only few are visible from outside. We present a new technique, Spherical Visibility Sampling (SVS), for real-time 3D rendering of such -- possibly highly complex -- scenes. SVS exploits the occlusion and annotates hierarchically structured objects with directional visibility information in a preprocessing step. For different directions, the directional visibility encodes which objects of a scene's region are visible from the outside of the regions' enclosing bounding sphere. Since there is no need to store a separate view space subdivision as in most techniques based on preprocessed visibility, a small memory footprint is achieved. Using the directional visibility information for an interactive walkthrough, the potentially visible objects can be retrieved very efficiently without the need for further visibility tests. Our evaluation shows that using SVS allows to preprocess complex 3D scenes fast and to visualize them in real time (e.g. a Power Plant model and five animated Boeing 777 models with billions of triangles). Because SVS does not require hardware support for occlusion culling during rendering, it is even applicable for rendering large scenes on mobile devices.}}, author = {{Eikel, Benjamin and Jähn, Claudius and Fischer, Matthias and Meyer auf der Heide, Friedhelm}}, booktitle = {{Computer Graphics Forum}}, issn = {{0167-7055}}, number = {{4}}, pages = {{49--58}}, title = {{{Spherical Visibility Sampling}}}, doi = {{10.1111/cgf.12150}}, volume = {{32}}, year = {{2013}}, } @inbook{16406, abstract = {{In order to evaluate the efficiency of algorithms for real-time 3D rendering, different properties like rendering time, occluded triangles, or image quality, need to be investigated. Since these properties depend on the position of the camera, usually some camera path is chosen, along which the measurements are performed. As those measurements cover only a small part of the scene, this approach hardly allows drawing conclusions regarding the algorithm's properties at arbitrary positions in the scene. The presented method allows the systematic and position-independent evaluation of rendering algorithms. It uses an adaptive sampling approach to approximate the distribution of a property (like rendering time) for all positions in the scene. This approximation can be visualized to produce an intuitive impression of the algorithm's behavior or be statistically analyzed for objectively rating and comparing algorithms. We demonstrate our method by evaluating performance aspects of a known occlusion culling algorithm. }}, author = {{Jähn, Claudius and Eikel, Benjamin and Fischer, Matthias and Petring, Ralf and Meyer auf der Heide, Friedhelm}}, booktitle = {{Advances in Visual Computing}}, isbn = {{9783642419133}}, issn = {{0302-9743}}, title = {{{Evaluation of Rendering Algorithms Using Position-Dependent Scene Properties}}}, doi = {{10.1007/978-3-642-41914-0_12}}, year = {{2013}}, } @inbook{16407, abstract = {{Many virtual 3D scenes, especially those that are large, are not structured evenly. For such heterogeneous data, there is no single algorithm that is able to render every scene type at each position fast and with the same high image quality. For a small set of scenes, this situation can be improved if different rendering algorithms are manually assigned to particular parts of the scene by an experienced user. We introduce the Multi-Algorithm-Rendering method. It automatically deploys different rendering algorithms simultaneously for a broad range of scene types. The method divides the scene into subregions and measures the behavior of different algorithms for each region in a preprocessing step. During runtime, this data is utilized to compute an estimate for the quality and running time of the available rendering algorithms from the observer's point of view. By solving an optimizing problem, the image quality can be optimized by an assignment of algorithms to regions while keeping the frame rate almost constant. }}, author = {{Petring, Ralf and Eikel, Benjamin and Jähn, Claudius and Fischer, Matthias and Meyer auf der Heide, Friedhelm}}, booktitle = {{Advances in Visual Computing}}, isbn = {{9783642419133}}, issn = {{0302-9743}}, title = {{{Real-Time 3D Rendering of Heterogeneous Scenes}}}, doi = {{10.1007/978-3-642-41914-0_44}}, year = {{2013}}, } @inproceedings{30558, author = {{Schulte, Christoph and Böcker, Joachim}}, booktitle = {{2013 International Electric Machines & Drives Conference}}, publisher = {{IEEE}}, title = {{{Co-simulation of an electric traction drive}}}, doi = {{10.1109/iemdc.2013.6556215}}, year = {{2013}}, } @article{36002, author = {{Schlegel-Matthies, Kirsten and Methfessel, Barbara}}, issn = {{2193-8806}}, journal = {{Haushalt in Bidlung und Forschung}}, number = {{4}}, pages = {{49--60}}, publisher = {{Barbara Budrich}}, title = {{{Für eine veränderte Fachpraxis - Zur Kultur und Technik der Nahrungszubereitung und Mahlzeitengestaltung}}}, volume = {{2}}, year = {{2013}}, } @inproceedings{11832, abstract = {{In this paper we propose an approach to retrieve the absolute geometry of an acoustic sensor network, consisting of spatially distributed microphone arrays, from reverberant speech input. The calibration relies on direction of arrival measurements of the individual arrays. The proposed calibration algorithm is derived from a maximum-likelihood approach employing circular statistics. Since a sensor node consists of a microphone array with known intra-array geometry, we are able to obtain an absolute geometry estimate, including angles and distances. Simulation results demonstrate the effectiveness of the approach.}}, author = {{Jacob, Florian and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)}}, issn = {{1520-6149}}, keywords = {{Geometry calibration, microphone arrays, position self-calibration}}, pages = {{116--120}}, title = {{{DoA-Based Microphone Array Position Self-Calibration Using Circular Statistic}}}, doi = {{10.1109/ICASSP.2013.6637620}}, year = {{2013}}, } @article{54933, abstract = {{In some patients with atypical cystic fibrosis (CF), only one allele of the CF transmembrane conductance regulator (CFTR) gene is affected. Mutations of the epithelial sodium channel (ENaC) may contribute to the pathophysiology of the disease in these patients. To functionally characterize a mutation in the $\beta$-subunit of ENaC ($\beta$V348M) recently identified in a patient with severe CF-like symptoms (Mutesa et al. 2009), we expressed wild-type (wt) $\alpha$$\beta$$\gamma$ENaC or mutant $\alpha$$\beta$V348M$\gamma$ENaC in Xenopus laevis oocytes. The $\beta$V348M mutation stimulated amiloride-sensitive whole-cell current ($\Delta$I(ami)) by $\sim$40% but had no effect on surface expression or single-channel conductance of ENaC. Instead the mutation increased channel open probability (P(o)). Proteolytic activation of mutant ENaC by chymotrypsin was reduced compared with that of wt ENaC ($\sim$3.0-fold vs. $\sim$4.2-fold), which is consistent with the increased baseline P(o) of mutant ENaC. Similarly, the ENaC activator S3969 stimulated mutant ENaC currents to a lesser degree (by $\sim$2.6-fold) than wt ENaC currents (by $\sim$3.5-fold). The gain-of-function effect of the $\beta$V348M mutation was confirmed by whole-cell current measurements in HEK293 cells transiently transfected with wt or mutant ENaC. Computational channel modeling in combination with functional expression of different $\beta$V348 mutants in oocytes suggests that the $\beta$V348M mutation increases channel P(o) by destabilizing the closed channel state. Our findings indicate that the gain-of-function effect of the $\beta$V348M mutation may contribute to CF pathophysiology by inappropriately increasing sodium and fluid absorption in the respiratory tract.}}, author = {{Rauh, Robert and Soell, Daniel and Haerteis, Silke and Diakov, Alexei and Nesterov, Viatcheslav and Krueger, Bettina and Sticht, Heinrich and Korbmacher, Christoph}}, journal = {{American Journal of Physiology-Lung Cellular and Molecular Physiology}}, number = {{1}}, pages = {{L43–L55}}, publisher = {{American Physiological Society}}, title = {{{A mutation in the $\beta$-subunit of ENaC identified in a patient with cystic fibrosis-like symptoms has a gain-of-function effect}}}, doi = {{10.1152/ajplung.00093.2012}}, volume = {{304}}, 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}}, } @phdthesis{37569, abstract = {{Das Marktportfolio der Hinterachsen weist zwischen den Achskonzepten Schwertlenkerachse und Verbundlenkerachse sowohl im Bereich der fahrdynamischen Auslegungsmöglichkeiten als auch unter Kosten- und Gewichtsaspekten eine Lücke auf. Dieser vom Markt zur Zeit nicht gedeckte Bereich lässt sich durch eine gezielte elastokinematische Aufwertung von Verbundlenkerachsen schließen. Zur Aufwertung und Weiterentwicklung der Verbundlenkerachse ist eine elastokinematische Spurkorrektur unter Seitenkraft und unter Bremskraft sowie eine Verbesserung des Verhältnisses zwischen Seiten- und Längssteifigkeit notwendig. Die vorliegende Promotionsschrift beschreibt und analysiert zunächst die Eigenschaften bestehender Ansätze zur elastokinematischen Optimierung von Verbundlenkerachsen. Basierend auf den Erkenntnissen dieser Untersuchungen wird eine Verbundlenkerachse mit entkoppeltem Radträger entwickelt, welche sowohl unter wirtschaftlichen als auch unter performanten Gesichtspunkten zwischen einer regulären Verbundlenkerachse und einer Schwertlenkerachse platziert werden kann. Die Entwicklung erfolgt vom Konzeptentwurf bis zum auskonstruierten Bauteil auf Basis numerischer Simulation. Die entwickelte Konstruktion wird in einen Prototypen überführt, welcher in einen Ford Focus implementiert wird. In Fahr- und Komponentenversuchen wird das Verhalten des neuen Achskonzepts untersucht und mit konkurrierenden Achskonzepten verglichen.}}, author = {{Schultz, Erik}}, isbn = {{978-3-8440-2290-2}}, keywords = {{Verbundlenkerachse, Fahrwerk, Hinterachse, Elastokinematik, entkoppelter Radträger}}, pages = {{232}}, publisher = {{Shaker Verlag}}, title = {{{Analyse und Synthese elastokinematisch optimierter Verbundlenkerachsen - Entwicklung einer Verbundlenkerachse mit entkoppeltem Radträger}}}, volume = {{2013,3}}, year = {{2013}}, } @misc{37412, author = {{Bigga, Regine}}, booktitle = {{Haushalt in Bildung und Forschung}}, issn = {{2193-8806}}, publisher = {{Verlag Barbara Budrich}}, title = {{{Ernährung- und Konsumbildung}}}, year = {{2013}}, } @article{36066, author = {{Lorenz, Cornelia}}, journal = {{ Quaderni di Palazzo Serra 22}}, pages = {{135--143}}, publisher = {{Università die Genova}}, title = {{{Niederdeutsche Lexeme im Regiolekt – eine empirische Studie unter Einheimischen und Zugezogenen in Ostwestfalen}}}, year = {{2013}}, } @article{24709, author = {{Mahnken, Rolf and Dammann, Christian}}, issn = {{0939-1533}}, journal = {{Archive of Applied Mechanics}}, pages = {{21--41}}, title = {{{Simulation of strain-induced anisotropy for polymers with weighting functions}}}, doi = {{10.1007/s00419-013-0780-3}}, year = {{2013}}, } @inproceedings{40789, abstract = {{It has been recently shown that for the 3-user single-input single-output (SISO) interference channel with constant channel coefficients, a maximum of 1.2 degrees-of-freedom (DoF) are achievable using linear interference alignment schemes when improper (a.k.a. asymmetric) Gaussian signaling is applied. In this paper, we study the 4-user SISO interference channel and provide inner and outer bounds for the total number of DoF achievable for this channel. We prove that at least 4/3 DoF are achievable for the 4-user channel using also linear interference alignment techniques and improper signaling. A simple converse proof shows that no more than 8/5 DoF are achievable for this scheme. Simulation results seem to indicate that the inner bound is in fact tight for this channel, and serve to illustrate the sum-rate improvement with respect to time division multiple access (TDMA) techniques.}}, author = {{Lameiro, Christian and Santamaría, Ignacio}}, booktitle = {{Proc.\ IEEE Int.\ Conf.\ Comm.}}, title = {{{Degrees-of-Freedom for the 4-User SISO Interference Channel with Improper Signaling}}}, doi = {{10.1109/ICC.2013.6655009}}, year = {{2013}}, }