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IEEE International Electric Machines and Drives Conference, IEMDC 2015

作者： Bramerdorfer, G. Zavoianu, A.-C. Silber, S. Lughofer, E. Amrhein, W. Institute for Electrical Drives and Power Electronics Johannes Kepler University Altenbergerstraße 69 Linz4040 Austria Altenbergerstraße 69 Linz4040 Austria Department of Knowledge-based Mathematical Systems Fuzzy Logic Laboratory Linz-Hagenberg Altenbergerstraße 69 Linz4040 Austria Altenbergerstraße 69 Linz4040 Austria

ISBN: (纸本)9781479979417

This article deals with accelerating typical optimization scenarios for electrical machine designs. Besides the advantage of a reduced computation time, this leads to a reduction in computational power and thus to a lower power consumption when running the optimization. If high power density is required, usually highly-utilized electrical machines which feature nonlinear characteristics are applied. As a consequence, typically optimization scenarios are considered where the evaluation of a potential design requires computationally expensive nonlinear finite element (FE) simulations. It is obvious that improving the speed of optimization runs takes top priority and various measures can be considered. This article is about (i) basic easily achievable measures, (ii) techniques for an efficient exploration of the design space, and (iii) advanced strategies to reduce the simulation time, e.g., (a) sophisticated emerging techniques for modeling machine characteristics by paring the number of required FE simulations down to the minimum and (b) nonlinear modeling of the targets of the optimization scenario as functions of the design parameters to further reduce the number of FE evaluations. By way of illustration, the analysis of a typical optimization task is given and achievable speed improvements as well as still present bottlenecks are discussed. © 2015 IEEE.

关键词： cogging torque electrical drive electrical machine evolutionary algorithms finite element (FE) simulation optimization surrogate modeling torque ripple

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Localic Krull dimension

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PAMM 2016年第1期16卷

作者： Guram Bezhanishvili Nick Bezhanishvili Joel Lucero-Bryan Jan van Mill Department of Mathematical Sciences New Mexico State University Las Cruces NM 88003 United States of America Institute for Logic Language and Computation Universiteit van Amsterdam Postbus 94242 1090 GE Amsterdam The Netherlands Department of Applied Mathematics and Sciences Khalifa University Abu Dhabi United Arab Emirates Korteweg-de Vries Institute for Mathematics Universiteit van Amsterdam 1098 XG Amsterdam The Netherlands

We shall define localic Krull dimension for topological spaces. In particular, a space X has the localic Krull dimension n if n is the greatest number such that X can be mapped, via a continuous and open map, onto the n -chain seen as an Alexandroff space. We shall discuss the applications of this concept in obtaining topological completeness results in modal logic. We shall also show how the localic Krull dimension is related to the Krull dimension in ring theory. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)

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Speed Improvements for the Optimization of Electrical Machines - a Survey

Speed Improvements for the Optimization of Electrical Machin...

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IEEE International Electric Machines and Drives Conference

作者： G. Bramerdorfer A. C. Zavoianu S. Silber E. Lughofer W. Amrhein Institute for Electrical Drives and Power Electronics Johannes Kepler University Department of Knowledge-based Mathematical Systems/Fuzzy Logic Laboratory Linz-Hagenberg LCM (Linz Center of Mechatronics)

ISBN: (纸本)9781479979424

关键词： Optimization Electrical machine Electrical drive Cogging torque Torque ripple Finite element (FE) simulation Evolutionary algorithms Surrogate modeling

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Efficient Multi-Objective Optimization Using 2-Population Cooperative Coevolution

Efficient Multi-Objective Optimization Using 2-Population Co...

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14th International Conference on Computer Aided Systems Theory, EUROCAST 2013

作者： ZǍvoianu, Alexandru-Ciprian Lughofer, Edwin Amrhein, Wolfgang Klement, Erich Peter Department of Knowledge-based Mathematical Systems/Fuzzy Logic Laboratory Johannes Kepler University of Linz Linz-Hagenberg Austria Institute for Electrical Drives and Power Electronics Johannes Kepler University of Linz Austria ACCM Austrian Center of Competence in Mechatronics Linz Austria

ISBN: (纸本)9783642538551

We propose a 2-population cooperative coevolutionary optimization method that can efficiently solve multi-objective optimization problems as it successfully combines positive traits from classic multi-objective evolutionary algorithms and from newer optimization approaches that explore the concept of differential evolution. A key part of the algorithm lies in the proposed dual fitness sharing mechanism that is able to smoothly transfer information between the two coevolved populations without negatively impacting the independent evolutionary process behavior that characterizes each population. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Multiobjective optimization

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An Effective Ensemble-Based Method for Creating On-the-Fly Surrogate Fitness Functions for Multi-objective Evolutionary Algorithms

An Effective Ensemble-Based Method for Creating On-the-Fly S...

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International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC)

作者： Alexandru-Ciprian Zavoianu Edwin Lughofer Gerd Bramerdorfer Wolfgang Amrhein Erich Peter Klement Department of Knowledge-based Mathematical Systems/Fuzzy Logic Laboratory Linz-Hagenberg Johannes Kepler University of Linz Austria Institute for Electrical Drives and Power Electronics Johannes Kepler University of Linz Austria

The task of designing electrical drives is a multi-objective optimization problem (MOOP) that remains very slow even when using state-of-the-art approaches like particle swarm optimization and evolutionary algorithms because the fitness function used to assess the quality of a proposed design is based on time-intensive finite element (FE) simulations. One straightforward solution is to replace the original FE-based fitness function with a much faster-to-evaluate surrogate. In our particular case each optimization scenario poses rather unique challenges (i.e., goals and constraints) and the surrogate models need to be constructed on-the-fly, automatically, during the run of the evolutionary algorithm. In the present research, using three industrial MOOPs, we investigated several approaches for creating such surrogate models and discovered that a strategy that uses ensembles of multi-layer perceptron neural networks and Pareto-trimmed training sets is able to produce very high quality surrogate models in a relatively short time interval.

关键词： Predictive models Training Computational modeling Optimization Accuracy Data models Evolutionary computation

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α-ideals of fuzzy lattices

α-ideals of fuzzy lattices

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Ivan Mezzomo Benjamin Bedregal Regivan H. N. Santiago Department of Mathematical Sciences Technology and Human - DCETH Rural Federal University of SemiArid - UFERSA Angicos - RN Brazil 59.515-000 Department of Informatics and Applied Mathematics Group for Logic Language Information Theory and Applications Federal University of Rio Grande do Norte Natal Rio Grande do Norte Brazil

ISBN: (纸本)9781479903467

We consider the fuzzy lattice notion introduced by Chon (Korean J. Math 17 (2009), No. 4, 361-374), define an α-ideals and α-filters for fuzzy lattices and characterize α-ideals and α-filters of fuzzy lattices by using its support and its level set. Moreover, we prove some similar properties to the classical theory of α-ideals and α-filters, such as, the class of α-ideals and α-filters are closed under union and intersection.

关键词： Lattices Upper bound Level set Educational institutions Informatics Electronic mail

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Operations on bounded fuzzy lattices

Operations on bounded fuzzy lattices

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Ivan Mezzomo Benjamin Bedregal Regivan H. N. Santiago Department of Mathematical Sciences Technology and Human - DCETH Rural Federal University of SemiArid - UFERSA Angicos - RN Brazil 59.515-000 Group for Logic Language Information Theory and Applications-LOLITA Department of Informatics and Applied Mathematics-DIMAp Federal University of Rio Grande do Norte Natal Rio Grande do Norte Brazil

ISBN: (纸本)9781479903467

We consider the notion of fuzzy lattice introduced by Chon (Korean J. Math 17 (2009), No. 4, 361-374), and define the operations of product and collapsed sum on bounded fuzzy lattice analogous to the classical theory. Also, we prove that the product and collapsed sum on bounded fuzzy lattices are fuzzy posets and, consequently, bounded fuzzy lattices.

关键词： Lattices Upper bound Educational institutions Informatics Electronic mail Sections

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Multi-agent programming contest 2013: The teams and the design of their systems

Multi-agent programming contest 2013: The teams and the desi...

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1st International Workshop on Engineering Multi-Agent Systems, EMAS 2013

作者： Ahlbrecht, Tobias Bender-Saebelkampf, Christian De Brito, Maiquel Christensen, Nicolai Christian Dix, Jürgen Franco, Mariana Ramos Heller, Hendrik Hess, Andreas Viktor Heßler, Axel Hübner, Jomi Fred Jensen, Andreas Schmidt Johnsen, Jannick Boese Köster, Michael Li, Chengqian Liu, Lu Morato, Marcelo Menezes Ørum, Philip Bratt Schlesinger, Federico Schmitz, Tiago Luiz Sichman, Jaime Simão De Souza, Kaio Siqueira Uez, Daniela Maria Villadsen, Jørgen Werner, Sebastian Woller, Øyvind Grønland Zatelli, Maicon Rafael Department of Informatics Clausthal University of Technology Julius-Albert-Str. 4 38678 Clausthal-Zellerfeld Germany Dept. of Computer Science Sun Yat-sen University Guangzhou 510006 China Algorithms Logic and Graphs Section Department of Applied Mathematics and Computer Science Technical University of Denmark Matematiktorvet DK-2800 Kongens Lyngby Denmark Brazil Distributed Artificial Intelligence Laboratory Technische Universität Berlin Germany Department of Automation and Systems Engineering Federal University of Santa Catarina CP 476 88040-900 Florianópolis - SC Brazil

ISBN: (纸本)9783642453427

Five teams participated in the Multi-Agent Programming Contest in 2013: All of them gained experience in 2012 already. In order to better understand which paradigms they used, which techniques they considered important and how much work they invested, the organisers of the contest compiled together a detailed list of questions (circa 50). This paper collects all answers to these questions as given by the teams. © 2013 Springer-Verlag.

关键词： Multi agent systems

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Linear extension diameter of subposets of Boolean lattice induced by two levels

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Electronic Notes in Discrete Mathematics 2011年 38卷 337-342页

作者： Fink, Jiří Gregor, Petr Department of Applied Mathematics Faculty of Mathematics and Physics Charles University in Prague Czech Republic Department of Theoretical Computer Science and Mathematical Logic Faculty of Mathematics and Physics Charles University in Prague Czech Republic

The linear extension diameter of a finite poset P is the diameter of the graph on all linear extensions of P as vertices, two of them being adjacent whenever they differ in exactly one (adjacent) transposition. Recently, Felsner and Massow determined the linear extension diameter of the Boolean lattice B, and they posed a question of determining the linear extension diameter of a subposet of B induced by two levels. We solve the case of the 1st and kth level. The diametral pairs are obtained from minimal vertex covers of so called dependency graphs, a new concept which may be useful also for the general case. © 2011 Elsevier B.V.

关键词： Boolean lattice Linear extension graph

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On autocorrelation based on Hermann Weyl's discrepancy norm for time series analysis

On autocorrelation based on Hermann Weyl's discrepancy norm ...

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2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010 - 2010 International Joint Conference on Neural Networks, IJCNN 2010

作者： Bouchot, Jean-Luc Himmelbauer, Johannes Bernhard, Moser Fuzzy Logic Laboratory Linz-Hagenberg Department of Knowledge-Based Mathematical Systems University of Linz Austria Knowledge-Based Technology Area Software Competence Center Hagenberg Austria

ISBN: (纸本)9781424469178

Hermann Weyl's concept of a discrepancy measure is discussed in the context of time series analysis. A concept for autocorrelation based on this discrepancy notion is introduced. It is shown that in particular for high frequent signals as they, for example, are typically encountered in a financial context, the introduced autocorrelation concept stands out by a better discriminative power than its classical counterpart. While the computational complexity of this novel autocorrelation is of quadratic order in terms of the number of given time steps an approximation based on Lp-norms is introduced which can be computed by convolution, and therefore reduces the order of complexity to that of its classical counterpart. It is shown that the proposed approximation can be tuned to be arbitrarily close to the original discrepancy based version, and that it shows similar desirable behavior. © 2010 IEEE.

关键词： Autocorrelation

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