检索结果-内蒙古大学图书馆

AFast Solver for an H_(1) Regularized PDE-Constrained Optimization Problem

Communications in Computational Physics 2016年第1期19卷 143-167页

作者： Andrew T.Barker Tyrone Rees Martin Stoll Center for Applied Scientific Computing Lawrence Livermore National LaboratoryMail Stop L-561LivermoreCA 94551USA Numerical Analysis Group Scientific Computing DepartmentRutherford Appleton LaboratoryChiltonDidcotOxfordshireOX110QXUnited Kingdom Computational Methods in Systems and Control Theory Max Planck Institute for Dynamics of Complex Technical SystemsSandtorstr.139106MagdeburgGermany

In this paperwe consider PDE-constrained optimization problemswhich incorporate an H_(1)regularization control *** focus on a time-dependent PDE,and consider both distributed and boundary *** problems we consider include bound constraints on the state,and we use a Moreau-Yosida penalty function to handle *** propose Krylov solvers and Schur complement preconditioning strategies for the different problems and illustrate their performance with numerical examples.

关键词： Preconditioning Krylov methods PDE-constrained optimization optimal control of PDEs

来源：评论

学校读者我要写书评

暂无评论

Coupling-modulated multi-stability and coherent dynamics in directed networks of heterogeneous nonlinear oscillators with modular topology

引用

IFAC-PapersOnLine 2016年第14期49卷 62-67页

作者： Steur, E. Tyukin, I. Gorban, A.N. Jarman, N. Nijmeijer, H. van Leeuwen, C. Eindhoven University of Technology Institute for Complex Molecular Systems Netherlands University of Leicester Department of Mathematics Saint-Petersburg State Electrotechnical University Department of Automation and Control Processes Russia University of Leicester Department of Mathematics United Kingdom KU Leuven Department of Psychology Laboratory for Perceptual Dynamics Belgium Eindhoven University of Technology Department of Mechanical Engineering Netherlands

We discuss the dynamics of modular networks of coupled nonlinear systems. Networks of this class can be viewed as locally connected clusters or modules of nodes with directed links from one cluster to another. Let these connections form an oriented cycle. Here we show that if connectivity within isolated clusters is diffusive with relatively strong coupling, then spectral properties of the corresponding network coupling matrix promote emergence and co-existence of multiple coherent and orderly dynamic regimes. We hypothesise that, similar to our previous work on the dynamics of cycles, in addition to a nearly fully synchronous state, an attracting rotating wave solution may occur. Furthermore, prevalence of one solution type over the other could be determined by the combination of the cycle length, inter- and intra-cluster coupling strengths, and the number of elements in each module. Our preliminary numerical experiments support these hypotheses. © 2016

关键词： dynamics Eigenvalues and eigenfunctions Heterogeneous networks Synchronization Coupled systems Diffusive coupling Eigen value Modular network Wave solution

来源：评论

学校读者我要写书评

暂无评论

Effects of mechanical boundary conditions on thermal shock resistance of ultra-high temperature ceramics

引用

Applied Mathematics and Mechanics(English Edition) 2015年第2期36卷 201-210页

作者： Tianbao CHENG Weiguo LI Yushan SHI Wei LU Daining FANG Chongqing Key Laboratory of Heterogeneous Material Mechanics College of Aerospace Engineering Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control College of Resources and Environmental Science Chongqing University State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University

The effects of mechanical boundary conditions, often encountered in thermalstructural engineering, on the thermal shock resistance（TSR） of ultra-high temperature ceramics（UHTCs） are studied by investigating the TSR of a UHTC plate with various types of constraints under the first, second, and third type of thermal boundary conditions. The TSR of UHTCs is strongly dependent on the heat transfer modes and severity of the thermal environments. Constraining the displacement of the lower surface in the thickness direction can significantly decrease the TSR of the UHTC plate, which is subject to the thermal shock at the upper surface. In contrast, the TSR of the UHTC plate with simply supported edges or clamped edges around the lower surface is much better.

关键词： thermal shock resistance（TSR） ultra-high temperature ceramic（UHTC） mechanical boundary condition temperature-dependent material property thermal environment

来源：评论

学校读者我要写书评

暂无评论

Synchronous oscillations in networks of time-delay coupled inert systems 4

Synchronous oscillations in networks of time-delay coupled i...

引用

4th IFAC Conference on Analysis and control of Chaotic systems, CHAOS 2015

作者： Steur, E. Van Leeuwen, C. Pogromsky, A. KU Leuven Laboratory for Perceptual Dynamics Belgium Eindhoven University of Technology Institute for Complex Molecular Systems Department of Mechanical Engineering Netherlands Eindhoven University of Technology Department of Mechanical Engineering Netherlands Saint-Petersburg National Research University of Information Technologies Mechanics and Optics Department of Control Systems and Informatics Netherlands

We discuss the emergence of oscillations in networks of inert single-input-singleoutput systems which interact via linear, time-delay coupling functions. We present conditions for 1. the solutions of the time-delay coupled systems to be bounded, 2. the network equilibrium to be unique, and 3. the network equilibrium to be unstable. If these conditions are all satisfied the network of time-delay coupled inert systems has a non-trivial oscillatory solution. In addition, we show that a necessary and sufficient condition for the emerge of oscillations in such networks is that the considered systems are at least second order. Moreover, using recent results on the existence of partial synchronization manifolds, we identify the patterns of oscillation that may emerge. © 2015, IFAG (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Time delay

来源：评论

学校读者我要写书评

暂无评论

Synchronous oscillations in networks of time-delay coupled inert systems

引用

IFAC-PapersOnLine 2015年第18期48卷 31-36页

作者： E. Steur C. van Leeuwen A. Pogromsky KU Leuven Laboratory for Perceptual Dynamics Eindhoven University of Technology Department of Mechanical Engineering and Saint-Petersburg National Research University of Information Technologies Mechanics and Optics Department of Control Systems and Informatics Eindhoven University of Technology Institute for Complex Molecular Systems and Department of Mechanical Engineering

We discuss the emergence of oscillations in networks of inert single-input-single-output systems which interact via linear, time-delay coupling functions. We present conditions for 1. the solutions of the time-delay coupled systems to be bounded, 2. the network equilibrium to be unique, and 3. the network equilibrium to be unstable. If these conditions are all satisfied the network of time-delay coupled inert systems has a non-trivial oscillatory solution. In addition, we show that a necessary and sufficient condition for the emerge of oscillations in such networks is that the considered systems are at least second order. Moreover, using recent results on the existence of partial synchronization manifolds, we identify the patterns of oscillation that may emerge.

关键词： Coupling Instability Networks Oscillation Synchronization Time-delay

来源：评论

学校读者我要写书评

暂无评论

26th Annual Computational Neuroscience Meeting (CNS*2017) of the Organization for Computational Neuroscience Antwerp, Belgium, July 15-20, 2017

引用

BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei

来源：评论

学校读者我要写书评

暂无评论

26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

引用

BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

来源：评论

学校读者我要写书评

暂无评论

Parallel solution of model predictive control using the alternating direction multiplier method

Parallel solution of model predictive control using the alte...

引用

4th IFAC Conference on Nonlinear Model Predictive control, NMPC'12

作者： Kögel, Markus Findeisen, Rolf Laboratory for Systems Theory and Automatic Control Otto-von-Guericke-University Magdeburg Germany Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany

ISBN: (纸本)9783902823076

In this work a parallel solution method for model predictive control is presented based on the alternating direction multiplier method. Our approach solves the overall problem by decomposing it along the time-axis into smaller subproblem. The resulting subproblems can be solved efficiently in parallel and are coupled by the multiplier update. We specifically considers box constraints, since this allows to use tailored methods to solve the subproblems. We outline the applicability of the approach and the performance using a multi-core systems. © 2012 IFAC.

关键词： Model predictive control

来源：评论

学校读者我要写书评

暂无评论

Parallel solution of model predictive control using the alternating direction multiplier method

引用

IFAC Proceedings Volumes 2012年第17期45卷 369-374页

作者： Markus Kögel Rolf Findeisen Laboratory for Systems Theory and Automatic Control Otto-von-Guericke-University Magdeburg Germany Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany

关键词： Model predictive control alternating direction method of multipliers

来源：评论

学校读者我要写书评

暂无评论

Expectation-driven migration promotes cooperation by group interactions

引用

Physical Review E 2012年第6期85卷 066104-066104页

作者： Te Wu Feng Fu Yanling Zhang Long Wang Center for Systems and Control State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing 100871 China Program for Evolutionary Dynamics Harvard University Cambridge Massachusetts 02138 USA

“Voting with feet” describes the prominent social phenomenon that people tend to move away from deteriorating neighborhoods and search for and join prosperous groups. To quantify the role this kind of expectation-driven migration plays in the evolution of cooperation, here we study a simple yet effective model of cooperation based on spatial public goods games. The population structure is characterized by a square lattice with some nodes being left empty. Individuals have expectations toward their current habitats. Dissatisfied players, whose expectation is not met after interacting with all directly connected neighbors, tend to abstain from the groups of low quality by moving away and explore the physical niches of avail. How fast interaction happens relatively to selection is regulated by the time-scale ratio of game interaction to natural selection. Under strong selection, simulation results show that cooperation is greatly improved for either low, moderate, or high expectations compared to whenever the expectation-driven migration is absent. Further explorations reveal that neither too high nor too low but rather a combination of moderate expectations and rapid interaction establishes cooperation for a moderate public goods enhancement factor. There exists an optimal interval of expectation level most favoring the evolution of cooperation as the required time-scale ratio is minimized.

关键词： GROUP theory PUBLIC goods MATHEMATICAL models NATURAL selection SIMULATION methods & models SPATIAL analysis (Statistics)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：