@inproceedings{24, author = {{Kenter, Tobias and Plessl, Christian}}, booktitle = {{Proc. Workshop on Heterogeneous High-performance Reconfigurable Computing (H2RC)}}, title = {{{Microdisk Cavity FDTD Simulation on FPGA using OpenCL}}}, year = {{2016}}, } @article{64421, author = {{Göring, Lena and Finkeldey, Markus and Gerhardt, Nils Christopher and Hofmann, Martin R.}}, journal = {{Adaptive Optics: Analysis, Methods & Systems}}, title = {{{Common-path digital holography microscopy of buried semiconductor specimen}}}, doi = {{10.1364/3d.2016.jw4a.40}}, year = {{2016}}, } @article{43194, abstract = {{For incident light polarized perpendicular to the tube axis the multi-band semiconductor Bloch equations (MB-SBEs) that involve various screened interband Coulomb interactions (ICIs) are derived. The calculated E 12 peak is very close to the longitudinal excitonic peak E 22. Compared with the previous theoretical peak positions, the blue-shift of the peak in our results is about 0.5 eV. Then, subsequent detailed analyses show that the screening effect on the diagonal ICIs (D-ICIs) plays a key role in this big blue-shift. The valley-degenerate transverse pair excitations holding the same selection rule further enhance the screening effect on D-ICIs. Specially at q = 0 the dielectric function acting on the D-ICIs enhances two times. In our calculation the strong screening effect contributes 90% of the big blue-shift, while the non-diagonal ICIs (ND-ICIs) contribute to 10% of the blue-shift.}}, author = {{Meier, Torsten and Liu, Hong}}, journal = {{The European Physical Journal B}}, title = {{{Influence of strong screening effect on the perpendicular polarized linear excitonic absorption spectra of semiconducting carbon nanotubes}}}, doi = {{10.1140/epjb/e2016-70476-8}}, volume = {{89}}, year = {{2016}}, } @article{60437, abstract = {{Parametrization based methods have recently become very popular for the generation of high quality quad meshes. In contrast to previous approaches, they allow for intuitive user control in order to accommodate all kinds of application driven constraints and design intentions. A major obstacle in practice, however, are the relatively long computations that lead to response times of several minutes already for input models of moderate complexity. In this paper we introduce a novel strategy to handle highly complex input meshes with up to several millions of triangles such that quad meshes can still be created and edited within an interactive workflow. Our method is based on representing the input model on different levels of resolution with a mechanism to propagate parametrizations from coarser to finer levels. The major challenge is to guarantee consistent parametrizations even in the presence of charts, transition functions, and singularities. Moreover, the remaining degrees of freedom on coarser levels of resolution have to be chosen carefully in order to still achieve low distortion parametrizations. We demonstrate a prototypic system where the user can interactively edit quad meshes with powerful high-level operations such as guiding constraints, singularity repositioning, and singularity connections.}}, author = {{Ebke, Hans-Christian and Schmidt, Patrick and Campen, Marcel and Kobbelt, Leif}}, issn = {{0730-0301}}, journal = {{ACM Transactions on Graphics}}, number = {{6}}, pages = {{1--13}}, publisher = {{Association for Computing Machinery (ACM)}}, title = {{{Interactively controlled quad remeshing of high resolution 3D models}}}, doi = {{10.1145/2980179.2982413}}, volume = {{35}}, year = {{2016}}, } @article{60436, abstract = {{This paper presents a method for bijective parametrization of 2D and 3D objects over canonical domains. While a range of solutions for the two-dimensional case are well-known, our method guarantees bijectivity of mappings also for a large, combinatorially-defined class of tetrahedral meshes (shellable meshes). The key concept in our method is the piecewise-linear (PL) foliation, decomposing the mesh into one-dimensional submanifolds and reducing the mapping problem to parametrization of a lower-dimensional manifold (a foliation section). The maps resulting from these foliations are proved to be bijective and continuous, and shown to have provably bijective PL approximations. We describe exact, numerically robust evaluation methods and demonstrate our implementation's capabilities on a large variety of meshes.}}, author = {{Campen, Marcel and Silva, Cláudio T. and Zorin, Denis}}, issn = {{0730-0301}}, journal = {{ACM Transactions on Graphics}}, number = {{4}}, pages = {{1--15}}, publisher = {{Association for Computing Machinery (ACM)}}, title = {{{Bijective maps from simplicial foliations}}}, doi = {{10.1145/2897824.2925890}}, volume = {{35}}, year = {{2016}}, } @inproceedings{252, abstract = {{Video streaming is in high demand by mobile users. In cellular networks, however, the unreliable wireless channel leads to two major problems. Poor channel states degrade video quality and interrupt the playback when a user cannot sufficiently fill its local playout buffer: buffer underruns occur. In contrast, good channel conditions cause common greedy buffering schemes to buffer too much data. Such over-buffering wastes expensive wireless channel capacity. Assuming that we can anticipate future data rates, we plan the quality and download time of video segments ahead. This anticipatory download scheduling avoids buffer underruns by downloading a large number of segments before a drop in available data rate occurs, without wasting wireless capacity by excessive buffering.We developed a practical anticipatory scheduling algorithm for segmented video streaming protocols (e.g., HLS or MPEG DASH). Simulation results and testbed measurements show that our solution essentially eliminates playback interruptions without significantly decreasing video quality.}}, author = {{Dräxler, Martin and Blobel, Johannes and Dreimann, Philipp and Valentin, Stefan and Karl, Holger}}, booktitle = {{Proceedings of the 2nd International Conference on Networked Systems (NetSys)}}, pages = {{1----8}}, title = {{{SmarterPhones: Anticipatory Download Scheduling for Wireless Video Streaming}}}, doi = {{10.1109/NetSys.2015.7089073}}, year = {{2015}}, } @inproceedings{25323, author = {{Weber, Jens}}, booktitle = {{Proceedings of the 2015 Winter Simulation Conference}}, editor = {{Yilmaz, L and Chan, K. V and Moon, I and Roeder, T. M. K, T. M. K and Macal, C and Rossetti, M. D}}, title = {{{A Technical Approach of a Simulation-Based Optimization Platform for Setup-Preparation via Virtual Tooling by Testing the Optimization of Zero Point Positions in CNC-Applications}}}, year = {{2015}}, } @inproceedings{25324, abstract = {{Customized planning, engineering and construction of one-of-a-kind products (like wind energy, biogas or power plants) are complex and contain a lot of risks and temporal uncertainties, e.g. of logistics and project schedules. Therefore the management of this kind of projects has to be supported by adequate methods for the estimation of project risks and uncertainties. Based on the results of the joint research project simject of the Universities of Paderborn and Kassel, which aims at the development of a demonstrator for simulation-based and logistic-integrated project planning and scheduling, this paper discusses the usage of different approaches for supporting project management of plant engineering projects. After a short introduction and description of the approaches to be compared a wind energy plant as evaluation model as well as the application of the different methods are presented. Additionally, the usage of the approaches is compared and the advantages and disadvantages are pointed out. }}, author = {{Akbulut, Akin and Laroque, Christoph and Wenzel, Sigrid and Jessen, Ulrich}}, booktitle = {{Proceedings of the 2015 Winter Simulation Conference}}, publisher = {{IEEE Press}}, title = {{{A Comparison of the Usage of Different Approaches for the Management of Plant Engineering Projects}}}, year = {{2015}}, } @inproceedings{25581, author = {{Reisch, Raphael-Elias and Weber, Jens and Laroque, Christoph and Schr{\"o}der, Christian}}, booktitle = {{ Proceedings of the 2015 Spring Simulation Multi-Conference}}, editor = {{Tolk, A and Padilla, J.J and Jafer, S}}, isbn = {{978-1-5108-0099-1}}, number = {{47}}, publisher = {{SCS (Society for Modeling & Simulation International)}}, title = {{{Asynchronous Optimization Techniques for Distributed Computing Applications}}}, volume = {{2}}, year = {{2015}}, } @inproceedings{19980, abstract = {{Fitness function design is known to be a critical feature of the evolutionary-robotics approach. Potentially, the complexity of evolving a successful controller for a given task can be reduced by integrating a priori knowledge into the fitness function which complicates the comparability of studies in evolutionary robotics. Still, there are only few publications that study the actual effects of different fitness functions on the robot's performance. In this paper, we follow the fitness function classification of Nelson et al. (2009) and investigate a selection of four classes of fitness functions that require different degrees of a priori knowledge. The robot controllers are evolved in simulation using NEAT and we investigate different tasks including obstacle avoidance and (periodic) goal homing. The best evolved controllers were then post-evaluated by examining their potential for adaptation, determining their convergence rates, and using cross-comparisons based on the different fitness function classes. The results confirm that the integration of more a priori knowledge can simplify a task and show that more attention should be paid to fitness function classes when comparing different studies.}}, author = {{Hamann, Heiko and Divband Soorati, Mohammad}}, booktitle = {{Proceedings of the Genetic and Evolutionary Computation Conference (GECCO 2015)}}, pages = {{153--160}}, publisher = {{ACM}}, title = {{{The Effect of Fitness Function Design on Performance in Evolutionary Robotics: The Influence of a Priori Knowledge}}}, doi = {{10.1145/2739480.2754676}}, year = {{2015}}, } @article{28015, abstract = {{Background Understanding changes in dietary intake during puberty could aid the mapping of dietary interventions for primary prevention. The present study describes dietary changes from childhood to adolescence, and their associations with parental education, family income, child education, body mass index (BMI), pubertal onset and screen-time sedentary behaviour. Methods Dietary data (n = 1232) were obtained from food frequency questionnaires at the 10- and 15-year follow-ups of the GINIplus birth cohort study. Intakes of 17 food groups, macronutrients and antioxidant vitamins, were described by a) paired Wilcoxon rank sum tests, comparing average intakes at each time-point, and b) Cohen’s kappa “tracking” coefficients, measuring stability of intakes (maintenance of relative tertile positions across time). Further, associations of changes (tertile position increase or decrease vs. tracking) with parental education, family income, child education, pubertal onset, BMI, and screen-time, were assessed by logistic regression and multinomial logistic regression models stratified by baseline intake tertile. Results Both sexes increased average intakes of water and decreased starchy vegetables, margarine and dairy. Females decreased meat and retinol intakes and increased vegetables, grains, oils and tea. Males decreased fruit and carbohydrates and increased average intakes of meat, caloric drinks, water, protein, fat, polyunsaturated fatty acids (PUFAs), vitamin C and alpha-tocopherol. Both sexes presented mainly “fair” tracking levels [κw = 0.21–0.40]. Females with high (vs. low) parental education were more likely to increase their nut intake [OR = 3.8; 95 % CI = (1.7;8.8)], and less likely to decrease vitamin C intakes [0.2 (0.1;0.5)], while males were less likely to increase egg consumption [0.2 (0.1;0.5)] and n3 PUFAs [0.2 (0.1;0.5)]. Females with a higher (vs. low) family income were more likely to maintain medium wholegrain intakes [0.2 (0.1;0.7) for decrease vs. tracking, and 0.1 (0.0;0.5) for increase vs. tracking], and were less likely to decrease vitamin C intakes [0.2 (0.1;0.6)]. Males with high education were less likely to increase sugar-sweetened foods [0.1 (0.1;0.4)]. Finally, BMI in females was negatively associated with decreasing protein intakes [0.7 (0.6;0.9)]. In males BMI was positively associated with increasing margarine [1.4 (1.1;1.6)] and vitamin C intakes [1.4 (1.1;1.6)], and negatively associated with increasing n3 PUFA. Conclusions Average dietary intakes changed significantly, despite fair tracking levels, suggesting the presence of trends in dietary behaviour during puberty. Family income and parental education predominantly influenced intake changes. Our results support the rationale for dietary interventions targeting children, and suggest that sex-specific subpopulations, e.g. low socio-economic status, should be considered for added impact.}}, author = {{Harris, Carla and Flexeder, Claudia and Thiering, Elisabeth and Buyken, Anette and Berdel, Dietrich and Koletzko, Sibylle and Bauer, Carl-Peter and Brüske, Irene and Koletzko, Berthold and Standl, Marie}}, journal = {{BMC Public Health}}, keywords = {{Puberty, Dietary intake, Dietary changes, Tracking, Determinants, Epidemiology}}, pages = {{841}}, title = {{{Changes in dietary intake during puberty and their determinants: results from the GINIplus birth cohort study}}}, volume = {{15}}, year = {{2015}}, } @inproceedings{28316, author = {{Abdelgawad, Kareem and Hassan, Bassem and Berssenbrügge, Jan and Stöcklein, Jörg and Grafe, Michael}}, booktitle = {{International Journal On Advances in Software, Band 8 }}, pages = {{247--261}}, publisher = {{IARIA}}, title = {{{A Modular Architecture of an Interactive Simulation and Training Environment for Advanced Driver Assistance Systems}}}, year = {{2015}}, } @article{260, abstract = {{During the last decade, researchers have proposed a number of model transformations enabling performance predictions. These transformations map performance-annotated software architecture models into stochastic models solved by analytical means or by simulation. However, so far, a detailed quantitative evaluation of the accuracy and efficiency of different transformations is missing, making it hard to select an adequate transformation for a given context. This paper provides an in-depth comparison and quantitative evaluation of representative model transformations to, e.g., Queueing Petri Nets and Layered Queueing Networks. The semantic gaps between typical source model abstractions and the different analysis techniques are revealed. The accuracy and efficiency of each transformation are evaluated by considering four case studies representing systems of different size and complexity. The presented results and insights gained from the evaluation help software architects and performance engineers to select the appropriate transformation for a given context, thus significantly improving the usability of model transformations for performance prediction.}}, author = {{Brosig, Fabian and Meier, Philipp and Becker, Steffen and Koziolek, Anne and Koziolek, Heiko and Kounev, Samuel}}, journal = {{Transactions on Software Engineering}}, number = {{2}}, pages = {{157----175}}, publisher = {{IEEE}}, title = {{{Quantitative Evaluation of Model-Driven Performance Analysis and Simulation of Component-based Architectures}}}, doi = {{10.1109/TSE.2014.2362755}}, year = {{2015}}, } @article{26124, abstract = {{Capillary forces between particles often dominate other adhesion forces. However, the calculation of the shape of capillary bridges and the resulting force is complex, so often assumptions and approximations are used. These assumptions are not useful for nanoscale particles. Therefore, a simulation method was established to calculate numerically the shape of the meniscus and derive the corresponding capillary bridge force. The main focus are nanoscaled particles with liquid bridges formed by condensing air humidity. The dependence of the capillary force on various parameters such as particle sizes, contact angle and humidity was investigated and it is demonstrated that often-used assumptions cannot be used for nanoscaled particles without remarkable mistake.}}, author = {{Dörmann, Michael and Schmid, Hans-Joachim}}, issn = {{1877-7058}}, journal = {{Procedia Engineering}}, pages = {{14--23}}, title = {{{Simulation of Capillary Bridges between Particles}}}, doi = {{10.1016/j.proeng.2015.01.102}}, year = {{2015}}, } @phdthesis{26234, author = {{Heinzemann, Christian}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Verification and Simulation of Self-Adaptive Mechatronic Systems}}}, volume = {{348}}, year = {{2015}}, } @article{263, abstract = {{In the last two decades, water consumption in Germany has been decreasing, which causes the water tanks and pipes in water distribution systems to work inefficiently. This paper proposes a method that supports the planning process for tanks in water distribution systems. The method uses a combination of network reduction, mathematical optimization and hydraulic simulation. The mathematical optimization model is a non-convex Mixed Integer Quadratically Constrained Program (MIQCP) that is solved by a piecewise linearization. As this may lead to many binary variables and therefore high computing times, the size of the water distribution system model is reduced before building the optimization model. After applying several network reduction techniques and using a piecewise approximation of the original model, there may be 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 distribution system model, the solution is verified by a hydraulic simulation. If the solution is not feasible, the reduced model has to be modified and solved again until the hydraulic simulation verifies a solution as feasible. In this paper, each of these processes is described and the results indicate the usefulness of each of them.}}, author = {{Hallmann, Corinna and Suhl, Leena}}, journal = {{OR Spectrum}}, pages = {{1--19}}, publisher = {{Springer}}, title = {{{Optimizing Water Tanks in Water Distribution Systems by combining Network Reduction, Mathematical Optimization and Hydraulic Simulation}}}, doi = {{10.1007/s00291-015-0403-1}}, year = {{2015}}, } @inproceedings{26459, author = {{Saveta, Tzanina and Daskalaki, Evangelia and Flouris, Giorgos and Fundulaki, Irini and Herschel, Melanie and Ngonga Ngomo, Axel-Cyrille}}, booktitle = {{Proceedings of the 24th International Conference on World Wide Web Companion, {WWW} 2015, Florence, Italy, May 18-22, 2015 - Companion Volume}}, editor = {{Gangemi, Aldo and Leonardi, Stefano and Panconesi, Alessandro}}, pages = {{105--106}}, publisher = {{{ACM}}}, title = {{{Pushing the Limits of Instance Matching Systems: A Semantics-Aware Benchmark for Linked Data}}}, doi = {{10.1145/2740908.2742729}}, year = {{2015}}, } @inproceedings{26460, author = {{Martin, Michael and Abicht, Konrad and Stadler, Claus and Ngonga Ngomo, Axel-Cyrille and Soru, Tommaso and Auer, Sören}}, booktitle = {{Proceedings of the 24th International Conference on World Wide Web Companion, {WWW} 2015, Florence, Italy, May 18-22, 2015 - Companion Volume}}, editor = {{Gangemi, Aldo and Leonardi, Stefano and Panconesi, Alessandro}}, pages = {{219--222}}, publisher = {{{ACM}}}, title = {{{CubeViz: Exploration and Visualization of Statistical Linked Data}}}, doi = {{10.1145/2740908.2742848}}, year = {{2015}}, } @inproceedings{26461, author = {{Soru, Tommaso and Marx, Edgard and Ngonga Ngomo, Axel-Cyrille}}, booktitle = {{Proceedings of the 24th International Conference on World Wide Web, {WWW} 2015, Florence, Italy, May 18-22, 2015}}, editor = {{Gangemi, Aldo and Leonardi, Stefano and Panconesi, Alessandro}}, pages = {{1025--1033}}, publisher = {{{ACM}}}, title = {{{ROCKER: A Refinement Operator for Key Discovery}}}, doi = {{10.1145/2736277.2741642}}, year = {{2015}}, } @inproceedings{26462, author = {{Usbeck, Ricardo and Röder, Michael and Ngonga Ngomo, Axel-Cyrille and Baron, Ciro and Both, Andreas and Brümmer, Martin and Ceccarelli, Diego and Cornolti, Marco and Cherix, Didier and Eickmann, Bernd and Ferragina, Paolo and Lemke, Christiane and Moro, Andrea and Navigli, Roberto and Piccinno, Francesco and Rizzo, Giuseppe and Sack, Harald and Speck, René and Troncy, Raphaël and Waitelonis, Jörg and Wesemann, Lars}}, booktitle = {{Proceedings of the 24th International Conference on World Wide Web, {WWW} 2015, Florence, Italy, May 18-22, 2015}}, editor = {{Gangemi, Aldo and Leonardi, Stefano and Panconesi, Alessandro}}, pages = {{1133--1143}}, publisher = {{{ACM}}}, title = {{{GERBIL: General Entity Annotator Benchmarking Framework}}}, doi = {{10.1145/2736277.2741626}}, year = {{2015}}, }