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检索条件"任意字段=IFIP TC7 20th Conference on System Modeling and Optimization"

共 27 条记录，以下是1-10 订阅

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system modeling and optimization Xx [electronic Resource] : ifip tc7 20th conference on system modeling and optimization July 23-27, 2001, Trier, Germany

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2016年

作者： e. w sachs

system modeling and optimization Xx [electronic Resource] : ifip tc7 20th conference on system modeling and optimization July 23-27, 2001, Trier, Germany by Sachs, E. W; Tichatschke, R; published by Boston, Ma : Sprin... 详细信息

关键词： [electronic electronic data processing mathematical optimization mathematics modeling optimization system systems theory

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

27th IFIP TC7 Conference on System Modeling and Optimization...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

ISBN: (纸本)9783319557946

the proceedings contain 49 papers. the special focus in this conference is on system modeling and optimization. the topics include: Control methods for the optimization of plasma scenarios in a tokamak;approximation of the equations of the humid atmosphere with saturation;parameter estimation in a size-structured population model with distributed states-at-birth;on the optimal control of opinion dynamics on evolving networks;coupling MPC and DP methods for an efficient solution of optimal control problems;real options and threshold strategies;electrostatic approximation of vector fields;modelling pesticide treatment effects on lygus hesperus in cotton fields;preconditioned ADMM with nonlinear operator constraint;regularized optimal design problem for a viscoelastic plate vibrating against a rigid obstacle;optimal abort landing in the presence of severe windshears;aircraft runway acceleration in the presence of severe wind gusts;dynamic programming approach for discrete-valued time discrete optimal control problems with dwell time constraints;successive approximation of nonlinear confidence regions;two-phase multi-criteria server selection for lightweight video distribution systems;strong optimal controls in a steady-state problem of complex heat transfer;a non-autonomous stochastic discrete time system with uniform disturbances;differentials and semidifferentials for metric spaces of shapes and geometries;necessary optimality conditions in a problem with integral equations on a nonfixed time interval subject to mixed and state constraints;uniform estimation of a constant issued from a fluid-structure interaction problem and a multivalued variational inequality with unilateral constraints.

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Control methods for the optimization of plasma scenarios in a Tokamak 27th

Control methods for the optimization of plasma scenarios in ...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Blum, Jacques Boulbe, Cédric Faugeras, Blaise Heumann, Holger Université Côte d’Azur Inria CNRS LJAD Nice France

ISBN: (纸本)9783319557946

this paper presents the modelling of the evolution of plasma equilibrium in the presence of external poloidal field circuits and passive structures. the optimization of plasma scenarios is formulated as an optimal control problem where the equations for the evolution of the plasma equilibrium are the constraints. the procedure determines the voltages applied to the external circuits that minimize a certain cost function representing the distance to a desired plasma augmented by an energetic cost of the electrical system. A sequential quadratic programming method is used to solve the minimization of the cost-function and an application to the optimization of a discharge for ITER is shown. © ifip International Federation for Information Processing 2016.

关键词： Magnetohydrodynamics

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Multimaterial topology optimization of variational inequalities 27th

Multimaterial topology optimization of variational inequalit...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Myśliński, Andrzej Systems Research Institute ul. Newelska 6 Warsaw01-447 Poland

ISBN: (纸本)9783319557946

the paper is concerned with the analysis and the numerical solution of the multimaterial topology optimization problems for bodies in unilateral contact. the contact phenomenon with Tresca friction is governed by the elliptic variational inequality. the structural optimization problem consists in finding such topology of the domain occupied by the body that the normal contact stress along the boundary of the body is minimized. the original cost functional is regularized using the multiphase volume constrained Ginzburg-Landau energy functional. the first order necessary optimality condition is formulated. the optimal topology is obtained as the steady state of the phase transition governed by the generalized Allen-Cahn equation. the optimization problem is solved numerically using the operator splitting approach combined with the projection gradient method. Numerical examples are provided and discussed. © ifip International Federation for Information Processing 2016.

关键词： Gradient methods

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A non-autonomous stochastic discrete time system with uniform disturbances 27th

A non-autonomous stochastic discrete time system with unifor...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Dassios, Ioannis K. Szajowski, Krzysztof J. MACSI Department of Mathematics and Statistics University of Limerick Limerick Ireland ERC Electricity Research Centre University College Dublin Dublin Ireland Faculty of Pure and Applied Mathematics Wroclaw University of Technology Wybrzeże Wyspiańskiego 27 Wroclaw50-370 Poland

ISBN: (纸本)9783319557946

the main objective of this article is to present Bayesian optimal control over a class of non-autonomous linear stochastic discrete time systems with disturbances belonging to a family of the one parameter uniform distributions. It is proved that the Bayes control for the Pareto priors is the solution of a linear system of algebraic equations. For the case that this linear system is singular, we apply optimization techniques to gain the Bayesian optimal control. these results are extended to generalized linear stochastic systems of difference equations and provide the Bayesian optimal control for the case where the coefficients of these type of systems are non-square matrices. the paper extends the results of the authors developed for system with disturbances belonging to the exponential family. © ifip International Federation for Information Processing 2016.

关键词： Linear systems

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A complex mathematical model with competition in Leukemia with immune response - An optimal control approach 27th

A complex mathematical model with competition in Leukemia wi...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Rǎdulescu, I.R. Cândea, D. Halanay, A. Department of Mathematics and Informatics POLITEHNICA University of Bucharest Splaiul Independentei 313 Bucharest060042 Romania

ISBN: (纸本)9783319557946

this paper investigates an optimal control problem associated with a complex nonlinear system of multiple delay differential equations modeling the development of healthy and leukemic cell populations incorporating the immune system. the model takes into account space competition between normal cells and leukemic cells at two phases of the development of hematopoietic cells. the control problem consists in optimizing the treatment effect while minimizing the side effects. the Pontryagin minimum principle is applied and important conclusions about the character of the optimal therapy strategy are drawn. © ifip International Federation for Information Processing 2016.

关键词： Immune system

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Implicit parametrizations and applications 27th

Implicit parametrizations and applications

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Nicolai, Mihaela Roxana Tiba, Dan Institute of Mathematics Romanian Academy P.O.BOX 1-764 Bucharest014700 Romania Academy of Romanian Scientists Splaiul Independentęi 54 Bucharest050094 Romania

ISBN: (纸本)9783319557946

We discuss recent constructive parametrizations approaches for implicit systems, via systems of ordinary differential equations. We also present the notion of generalized solution, in the critical case and indicate some numerical examples in dimension two and three, using MatLab. In shape optimizations problems, using this method, we introduce general optimal control formulations in the boundary observation case. this extends previous work of the authors on optimal design problems with distributed cost functional. © ifip International Federation for Information Processing 2016.

关键词： Shape optimization

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optimization of engineering processes including heating in time-dependent domains 27th

Optimization of engineering processes including heating in t...

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Schmidt, Alfred Bänsch, Eberhard Jahn, Mischa Luttmann, Andreas Niebuhr, Carsten Vehmeyer, Jost Zentrum für Technomathematik Universität Bremen Bremen Germany Department Mathematik Friedrich-Alexander-Universität Erlangen Nürnberg Erlangen Germany

ISBN: (纸本)9783319557946

We present two models for engineering processes, where thermal effects and time-dependent domains play an important role. Typically, the parabolic heat equation is coupled with other equations. Challenges for the optimization of such systems are presented. the first model describes a milling process, where material is removed and heat is produced by the cutting, leading to thermomechanical distortion. Goal is the minimization of these distortions. the second model describes the melting and solidification of metal, where the geometry is a result of free-surface flow of the liquid and the microstructure of the re-solidified material is important for the quality of the produced preform. © ifip International Federation for Information Processing 2016.

关键词： Milling (machining)

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Preconditioned ADMM with nonlinear operator constraint 27th

Preconditioned ADMM with nonlinear operator constraint

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27th ifip tc7 conference on system modeling and optimization, CSMO 2015

作者： Benning, Martin Knoll, Florian Schönlieb, Carola-Bibiane Valkonen, Tuomo Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road CambridgeCB3 0WA United Kingdom Center for Advanced Imaging Innovation and Research New York University 4th Floor 660 First Avenue New YorkNY10016 United States Department of Mathematical Sciences University of Liverpool Mathematical Sciences Building LiverpoolL69 7ZL United Kingdom

ISBN: (纸本)9783319557946

We are presenting a modification of the well-known Alternating Direction Method of Multipliers (ADMM) algorithm with additional preconditioning that aims at solving convex optimisation problems with nonlinear operator constraints. Connections to the recently developed Nonlinear Primal-Dual Hybrid Gradient Method (NL-PDHGM) are presented, and the algorithm is demonstrated to handle the nonlinear inverse problem of parallel Magnetic Resonance Imaging (MRI). © ifip International Federation for Information Processing 2016.

关键词： Magnetic resonance imaging

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Introducing periodic parameters in a marine ecosystem model using discrete linear quadratic control

Introducing periodic parameters in a marine ecosystem model ...

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25th ifip tc 7 conference on system modeling and optimization, CSMO 2011

作者： El Jarbi, Mustapha Slawig, thomas Oschlies, Andreas Institute for Computer Science Christian- Albrechts Universitaet Zu Kiel Kiel 24098 Germany GEOMAR Düsternbrooker Weg 20 24105 Kiel Germany

ISBN: (纸本)9783642360619

this paper presents the application of the Discrete Linear Quadratic Control (DLQC) method for a parameter optimization problem in a marine ecosystem model. the ecosystem model simulates the distribution of nitrogen, phytoplankton, zooplankton and detritus in a water column with temperature and turbulent diffusivity profiles taken from a three-dimensional ocean circulation model. We present the linearization method which is based on the available observations. the linearization is necessary to apply the DLQC method on the nonlinear system of state equations. We show the form of the linearized time-variant problems and the resulting two algebraic Riccati Equations. By using the DLQC method, we are able to introduce temporally varying periodic model parameters and to significantly improve - compared to the use of constant parameters - the fit of the model output to given observational data. © 2013 ifip International Federation for Information Processing.

关键词： Nonlinear systems

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