@book{22362, author = {{Adelt, Philipp and Esau, Natascha and Hölscher, Christian and Kleinjohann, Bernd and Kleinjohann, Lisa and Krüger, Martin and Zimmer, Detmar}}, isbn = {{978-953-307-300-2}}, pages = {{169--194}}, publisher = {{InTech}}, title = {{{Hybrid Planning for Self-Optimization in Railbound Mechatronic Systems}}}, doi = {{10.5772/15451}}, year = {{2011}}, } @inproceedings{23181, author = {{Krüger, Martin and Witting, Katrin and Trächtler, Ansgar and Dellnitz, Michael}}, booktitle = {{18th IFAC World Congress}}, title = {{{Parametric Model-Order Reduction in Hierarchical Multiobjective Optimization of Mechatronic Systems}}}, year = {{2011}}, } @inbook{23189, author = {{Adelt, Philipp and Esau, Natascha and Hölscher, Christian and Kleinjohann, Bernd and Kleinjohann, Lisa and Krüger, Martin and Zimmer, Detmar}}, booktitle = {{Intelligent Mechatronics}}, pages = {{169 -- 194}}, publisher = {{InTech Open Access Publisher}}, title = {{{Hybrid Planning for Self-Optimization in Railbound Mechatronic Systems}}}, year = {{2011}}, } @inproceedings{799, author = {{Volkhausen, Tobias and Schinköthe, Kai and Karl, Holger}}, booktitle = {{IEEE 8th International Conference on Mobile Adhoc and Sensor Systems, MASS 2011, Valencia, Spain, October 17-22, 2011}}, pages = {{146----148}}, title = {{{Coding Opportunities from Similar Data in Wireless Cooperation Diversity Systems}}}, doi = {{10.1109/MASS.2011.126}}, year = {{2011}}, } @article{7354, abstract = {{Acceptance testing is a time-consuming task for complex software systems that have to fulfill a large number of requirements. To reduce this effort, we have developed a widely automated method for deriving test plans from requirements that are expressed in natural language. It consists of three stages: annotation, clustering, and test plan specification. The general idea is to exploit redundancies and implicit relationships in requirements specifications. Multi-viewpoint techniques based on RM-ODP (Reference Model for Open Distributed Processing) are employed for specifying the requirements. We then use linguistic analysis techniques, requirements clustering algorithms, and pattern-based requirements collection to reduce the total effort of testing against the requirements specification. In particular, we use linguistic analysis for extracting and annotating the actor, process and object of a requirements statement. During clustering, a similarity function is computed as a measure for the overlap of requirements. In the test plan specification stage, our approach provides capabilities for semi-automatically deriving test plans and acceptance criteria from the clustered informal textual requirements. Two patterns are applied to compute a suitable order of test activities. The generated test plans consist of a sequence of test steps and asserts that are executed or checked in the given order. We also present the supporting prototype tool TORC, which is available open source. For the evaluation of the approach, we have conducted a case study in the field of acceptance testing of a national electronic identification system. In summary, we report on lessons learned how linguistic analysis and clustering techniques can help testers in understanding the relations between requirements and for improving test planning.}}, author = {{Güldali, Baris and Funke, Holger and Sauer, Stefan and Engels, Gregor}}, issn = {{0963-9314}}, journal = {{Software Quality Journal}}, number = {{4}}, pages = {{771--799}}, publisher = {{Springer Nature}}, title = {{{TORC: test plan optimization by requirements clustering}}}, doi = {{10.1007/s11219-011-9149-4}}, volume = {{19}}, year = {{2011}}, } @article{9765, abstract = {{The multi-objective optimal design of a piezoelectric sandwich ultrasonic transducer is studied. The maximum vibration amplitude and the minimum electrical input power are considered as optimization objectives. Design variables involve continuous variables (dimensions of the transducer) and discrete variables (material types). Based on analytical models, the optimal design is formulated as a constrained multi-objective optimization problem. The optimization problem is then solved by using the elitist non-dominated sorting genetic algorithm (NSGA-II) and Pareto-optimal designs are obtained. The optimized results are analyzed and the preferred design is proposed. The optimization procedure presented in this contribution can be applied in multi-objective optimization problems of other piezoelectric transducers.}}, author = {{Hemsel, Tobias and Fu, Bo and Jing, Yi and Fu, Xuan}}, journal = {{Key Engineering Materials}}, pages = {{1808--1812}}, publisher = {{Trans Tech Publ}}, title = {{{Multi-Objective Optimization of a Piezoelectric Sandwich Ultrasonic Transducer by Using Elitist Non-Dominated Sorting Genetic Algorithm}}}, doi = {{10.4028/www.scientific.net/KEM.474-476.1808}}, volume = {{474 - 476}}, year = {{2011}}, } @inproceedings{9771, abstract = {{Dieser Beitrag stellt ein Konzept vor, welches die Methode der Mehrzieloptimierung mit einer Online-Bewertung des aktuellen Systemzustands kombiniert. Dieses erlaubt Maßnahmen zur Zuverlässigkeitssteigerung abzuleiten. Das Konzept wird auf ein X-by-wire-Fahrzeug mit Einzelradaktorik angewandt. Dabei steht zunächst die Beeinflussung der Ziele der Mehrzieloptimierung zugunsten der Zuverlässigkeit des Systems im Vordergrund. In Simulationen wird gezeigt, dass über die Wahl und Gewichtung der Zielfunktionen die Quer- und Längskräfte an den Rädern vorteilhaft verteilt werden können. In this contribution a concept is illustrated, which combines the multi-objective optimization technique with an online assessment of the current system state. This allows deriving measures to increase the reliability of the system. The concept is applied to an X-by-wire vehicle with single-wheel actuators. The emphasis is here mostly on the influence of the objectives of the multiobjective optimization for the benefit of the reliability of the system. It is demonstrated in simulations, that the lateral and longitudinal forces at the wheels can be distributed advantageously by the selection of the suitable objective functions and the appropriate weights.}}, author = {{Sondermann-Wölke, Christoph and Sextro, Walter and Reinold, Peter and Trächtler, Ansgar}}, booktitle = {{25. Tagung Technische Zuverlässigkeit (TTZ 2011) - Entwicklung und Betrieb zuverlässiger Produkte}}, pages = {{291--302}}, title = {{{Zuverlässigkeitsorientierte Mehrzieloptimierung zur Aktorrekonfiguration eines X-by-wire-Fahrzeugs}}}, year = {{2011}}, } @article{9772, abstract = {{A profound description of friction in wheel--rail contact plays an essential role for optimization of traction control strategies, as input quantity for railway simulations in general and for the estimation of wear and rolling contact fatigue. A multitude of wheel--rail contact models exists, however, traction--creepage curves obtained from measurements show quantitative and qualitative deviations. There are several phenomena which influence the traction--creepage characteristics: Mechanisms resulting from surface roughness, frictional heating or the presence of interfacial fluids can have a dominating influence on friction. In this paper, a new wheel--rail contact model, accounting for these influential parameters, will be presented. The presented model accounts for the interaction of an interfacial fluid model for combined boundary and mixed lubrication of rough surfaces with a wheel--rail contact model that additionally accounts for frictional heating. A quantitative comparison with measurements found in the literature is not conducted, since the exact conditions of the measurements are mostly unknown and parameters can easily be adjusted to fit the measurements. Emphasis is placed on the qualitative behavior of the model with respect to the measurements and good agreement is found. The dependence of the maximum traction coefficient on rolling velocity, surface roughness and normal load is studied under dry and water lubricated conditions.}}, author = {{Tomberger, Christoph and Dietmaier, Peter and Sextro, Walter and Six, Klaus}}, issn = {{0043-1648}}, journal = {{Wear}}, keywords = {{Wheel--rail contact, Rolling contact, Friction, Interfacial fluid, Lubrication, Surface roughness, Contact temperature}}, pages = {{2 -- 12}}, title = {{{Friction in wheel--rail contact: A model comprising interfacial fluids, surface roughness and temperature}}}, doi = {{10.1016/j.wear.2010.10.025}}, volume = {{271}}, year = {{2011}}, } @article{16629, author = {{Krüger, Martin and Witting, Katrin and Trächtler, Ansgar and Dellnitz, Michael}}, issn = {{1474-6670}}, journal = {{IFAC Proceedings Volumes}}, pages = {{12611--12619}}, title = {{{Parametric Model-Order Reduction in Hierarchical Multiobjective Optimization of Mechatronic Systems*}}}, doi = {{10.3182/20110828-6-it-1002.02487}}, year = {{2011}}, } @inproceedings{14016, abstract = {{There has been a lot of progress in finding measurable quantities of high in- formation content for the inverse determination of piezoelectric material properties. Since some material parameters (mainly \textgreek{e}S 11, e15and cE 44) do not or only marginally influence the electrical impedance over frequency, it is not sufficient to look only at the electri- cal impedance of discoidal piezoceramics [1]. Moreover, the parameter sensitivities vary with respect to the diameter--thickness ratio of the disc and the design of an ultrasonic transducer's piezoceramic has to match other requirements than those of a good material characterization [2, 3]. That is why it is still desirable to find model based approaches for parameter identification that either keep the technical effort low (e.g., only an impedance measurement) or increase speed of the inversion procedure. In this contribution we answer the question if an additional analytical approximation of cE 44, strictly following the ideas of Theocaris [4], in conjunction with a single measured elec- trical impedance will be sufficient for an accurate simulation of both, electrical impedance and surface normal velocity of a piezoceramic disc. Thereby, the remaining parameters are identified by means of the Inverse Method. Furthermore, we use the parameter ap- proximation as an initial guess and limiting boundary to speed up the inverse algorithm if both, electrical impedance and surface normal velocity are taken into account within the optimization procedure.}}, author = {{Rautenberg, Jens and Rupitsch, Stefan J. and Henning, Bernd and Lerch, Reinhard}}, booktitle = {{7th International Workshop on Direct and Inverse Problems in Piezoelectricity}}, title = {{{Utilizing an Analytical Approximation for c44E to Enhance the Inverse Method for Material Parameter Identification of Piezoceramics}}}, year = {{2011}}, } @inproceedings{14550, abstract = {{For many applications like level measurement and industry robotics it is of advantage if the directional characteristic of an ultrasonic transducer is changeable or adaptable for the improvement of spatial resolution. Often this goal is reached with the use of ultrasonic transducer arrays, which elements are driven with phase shifted excitation signals. One disadvantage of these solutions is the great effort for building such an array and the multi-channel sensor electronics. In this contribution the directional characteristic of a single air transducer with segmented electrodes is analyzed. Therefore a variable script based finite element model is used to discover the influence of different electrode configurations on the directional characteristic of a single piezoceramic transducer. Especially the influence on the angle of beam and the near field length are evaluated. The used variable model permits an optimization of the configuration with regards to the mentioned criteria. The findings will be used for the development of a level measurement system for bulk solids.}}, author = {{Unverzagt, Carsten and Henning, Bernd}}, keywords = {{Elektrode}}, location = {{Gdansk, Poland}}, title = {{{Finite element simulation of single ultrasonic transducer with segmented electrodes to adjust the directional characteristic}}}, year = {{2011}}, } @inproceedings{29464, author = {{Moore, A. and Ober-Blöbaum, Sina and Marsden, J.E.}}, booktitle = {{21st AAS/AIAA Space Flight Mechanics Meeting}}, location = {{New Orleans, Lousiana, USA}}, title = {{{Mesh refinement strategies for spacecraft trajectory optimization using discrete mechanics and optimal control}}}, year = {{2011}}, } @inproceedings{26371, author = {{Xue, Yudong and Irohara, Takashi and Kl{\"o}pper, Benjamin and Pater, Jan-Patrick}}, title = {{{CO²-Emmission aware pareto optimization for international transportation with time tables}}}, year = {{2011}}, } @article{26380, abstract = {{The number and scale of humanitarian operations has significantly increased during the past decades due to the rising number of humanitarian emergencies and natural disasters worldwide. Therefore, the development of appropriate planning methods for optimization of the respective supply chains is constantly growing in importance. A specific problem in the context of humanitarian operations is the supply of relief items to the affected areas after the occurrende of a sudden change in demand or supply, for example, due to an epidemic or to unexpected shortages, durng an ongoing humanitarian action. When such overlapping disasters occur, goods must be relocated to existing depots in a way which enables rapid suppply to regions with new and urgent demand. At the same time, ongoing operations have to continue, i. e., the other regions should not suffer from shortages, and possible future emergencies must be taken into account. This is a planning situation under uncertainty as it is not known in advance if and where a disruption - and hence additional demand - will occur. In this paper, an optimization model for such situations is developed based n penalty costs for non-satishied demand. A rolling horizon approach for solving the model is presented, and it is shown that taking into account the possibility of future disruptions can helb to balance inventories and to reduce total non-served demand.}}, author = {{Rottkemper, Beate and Fischer, Kathrin and Blecken, Alexander and Danne, Christoph}}, journal = {{OR Spectrum}}, number = {{3}}, pages = {{721--749}}, title = {{{Inventory relocation for overlapping disaster settigs in humanitarian operations}}}, volume = {{33}}, year = {{2011}}, } @inproceedings{26373, author = {{Brodkorb, Daniel and Dangelmaier, Wilhelm}}, title = {{{Online Optimization in series production}}}, year = {{2011}}, } @inproceedings{26364, abstract = {{We propose the use of the material flow simulation to evaluate the robustness of a production plan, which was created and optimized with no respect to unforeseen derivations. Since the necessary probabilities for machine failures and similar operational events on the floor can easily be integrated in the simulation model, in order to analyze, how initial plan performs in these situations. The influence of unforeseen events in daily production cannot be modeled within mathematical optimization without consuming large amounts of computation time. We show a possible way to use simulation to evaluate and enhance a production plan. We illustrate the developed process using a real-world use-case of medium complexity and can show, that simulation is able to evaluate the robustness of a given pro-optimizes production plan. }}, author = {{Laroque, Christoph and Delius, Robin and Fischer, Jan-Hendrik and Horstkemper, Dennis}}, booktitle = {{Proceedings of The Third International Conference on Advances}}, pages = {{13--20}}, publisher = {{Xpert Publishing Services}}, title = {{{Increase of Robustness on Pre-optimized Production Plans Through Simulation-based Analysis and Evaluation}}}, year = {{2011}}, } @inbook{36018, author = {{Schlegel-Matthies, Kirsten and Methfessel, Barbara and Heindl, Ines}}, booktitle = {{Die Zukunft auf dem Tisch. Analysen, Trends und Perspektiven der Ernährung von morgen}}, editor = {{Plöger, Angelika and Hirschfelder, Gunther and Schönberger, Gesa}}, isbn = {{9783531176437}}, pages = {{187--202}}, publisher = {{VS-Verlag}}, title = {{{Ernährungssozialisation und -bildung und die Entstehung einer "kulinarischen Vernunft"}}}, year = {{2011}}, } @inbook{36031, author = {{Schlegel-Matthies, Kirsten and Methfessel, Barbara}}, booktitle = {{"Gesunde Lebensführung" - kritische Analyse eines populären Konzepts}}, editor = {{Hoefert, Hans-Wolfgang and Klotter, Christoph}}, isbn = {{9783456849966}}, pages = {{127--142}}, publisher = {{Huber}}, title = {{{Ernährung und Diätetik}}}, year = {{2011}}, } @inbook{36008, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Mahlzeiten. Alte Last oder neue Lust?}}, editor = {{Schönberger, Gesa and Methfessel, Barbara}}, pages = {{12}}, publisher = {{VS-Verlag}}, title = {{{Mahlzeit im Wandel - die Entideologisierung einer Institution}}}, year = {{2011}}, } @inproceedings{46401, abstract = {{Exploratory Landscape Analysis subsumes a number of techniques employed to obtain knowledge about the properties of an unknown optimization problem, especially insofar as these properties are important for the performance of optimization algorithms. Where in a first attempt, one could rely on high-level features designed by experts, we approach the problem from a different angle here, namely by using relatively cheap low-level computer generated features. Interestingly, very few features are needed to separate the BBOB problem groups and also for relating a problem to high-level, expert designed features, paving the way for automatic algorithm selection.}}, author = {{Mersmann, Olaf and Bischl, Bernd and Trautmann, Heike and Preuss, Mike and Weihs, Claus and Rudolph, Günter}}, booktitle = {{Proceedings of the 13th Annual Conference on Genetic and Evolutionary Computation}}, isbn = {{9781450305570}}, keywords = {{exploratory landscape analysis, evolutionary optimization, fitness landscape, benchmarking, BBOB test set}}, pages = {{829–836}}, publisher = {{Association for Computing Machinery}}, title = {{{Exploratory Landscape Analysis}}}, doi = {{10.1145/2001576.2001690}}, year = {{2011}}, }