检索结果-内蒙古大学图书馆

Universite Libre de Bruxelles

作者： Henriksen, Soren Wills, Adrian Schön, Thomas B. Ninness, Brett School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Division of Automatic Control Linköping University SE-581 83 Linköping Sweden

ISBN: (纸本)9783902823069

This paper examines the problem of estimating the parameters describing system models of quite general nonlinear and multi-variable form. The approach is a computational one in which quantities that are intractable to evaluate exactly are approximated by sample averages from randomized algorithms. The main contribution is to illustrate the viability and utility of this approach by examining how high computational loads can be simply managed using commodity hardware. The proposed algorithms and solution architectures are profiled on concrete examples. © 2012 IFAC.

关键词： Graphics processing unit

来源：评论

学校读者我要写书评

暂无评论

Robust experiment design for system identification via semi-infinite programming techniques

Robust experiment design for system identification via semi-...

引用

Universite Libre de Bruxelles

作者： Katselis, Dimitrios Rojas, Cristian R. Welsh, James S. Hjalmarsson, Hakan Automatic Control Lab. and ACCESS Linnaeus Center Electrical Engineering KTE Royal Institute of Technology S-100 44 Stockholm Sweden School of Electrical Engineering and Computer Science University of Newcastle NSW 2308 Australia

ISBN: (纸本)9783902823069

Robust optimal experiment design for dynamic system identification is cast as a minmax optimization problem, which is infinite-dimensional. If the input spectrum is discretized (either by considering a Riemmann approximation, or by restricting it to the span of a finite dimensional linear space), this problem falls within the class of semi-infinite convex programs. One approach to this optimization problem of infinite constraints is the so called "scenario approach", which is based on a probabilistic description of the uncertainty to deliver a finite program that attempts to approximate the optimal solution with a prescribed probability. In this paper, we propose as an alternative an exchange algorithm based on some recent advances in the field of semi-infinite programming to tackle the same problem. This method is compared with the scenario approach both from the aspects of accuracy and computational efficiency. Furthermore, the comparison includes the MATLAB semi-infinite solver fseminf to provide a general palette of methods approximating the robust optimal design problem. © 2012 IFAC.

关键词： Computational efficiency

来源：评论

学校读者我要写书评

暂无评论

Fair scheduling in common-pool games by aspiration learning

Fair scheduling in common-pool games by aspiration learning

引用

2012 10th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks, WiOpt 2012

作者： Chasparis, Georgios C. Arapostathis, Ari Shamma, Jeff S. Department of Automatic Control Lund University 221 00-SE Lund Sweden Department of Electrical and Computer Engineering University of Texas at Austin 1 University Station Austin TX 78712 United States School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States

ISBN: (纸本)9783901882456

We propose a distributed learning algorithm for fair scheduling in common-pool games. Common-pool games are strategic-form games where multiple agents compete over utilizing a limited common resource. A characteristic example is the medium access control problem in wireless communications, where multiple users need to decide how to share a single communication channel so that there are no collisions (situations where two or more users use the medium at the same time slot). We introduce a (payoff-based) learning algorithm, namely aspiration learning, according to which agents learn how to play the game based only on their own prior experience, i.e., their previous actions and received rewards. Decisions are also subject to a small probability of mistakes (or mutations). We show that when all agents apply aspiration learning, then as time increases and the probability of mutations goes to zero, the expected percentage of time that agents utilize the common resource is equally divided among agents, i.e., fairness is established. When the step size of the aspiration learning recursion is also approaching zero, then the expected frequency of collisions approaches zero as time increases. © 2012 IFIP.

关键词： Medium access control

来源：评论

学校读者我要写书评

暂无评论

Identification of Box-Jenkins models using structured ARX models and nuclear norm relaxation *

引用

IFAC Proceedings Volumes 2012年第16期45卷 322-327页

作者： Håkan Hjalmarsson James S. Welsh Cristian. R. Rojas Automatic Control Lab and ACCESS Linnaeus Centre KTH Royal Institute of Technology School of Electrical Engineering and Computer Science University of Newcastle Australia

In this contribution we present a method to estimate structured high order ARX models. By this we mean that the estimated model, despite its high order is close to a low order model. This is achieved by adding two terms to the least-squares cost function. These two terms correspond to nuclear norms of two Hankel matrices. These Hankel matrices are constructed from the impulse response coefficients of the inverse noise model, and the numerator polynomial of the model dynamics, respectively. In a simulation study the method is shown to be competitive as compared to the prediction error method. In particular, in the study the performance degrades more gracefully than for the Prediction Error Method when the signal to noise ratio decreases.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Smart energy-aware sensors for event-based control

Smart energy-aware sensors for event-based control

引用

51st IEEE Conference on Decision and control, CDC 2012

作者： Cardoso De Castro, Nicolas Quevedo, Daniel E. Garin, Federica Canudas De Wit, Carlos INRIA Rhône-Alpes NeCS Team Grenoble France School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Department of Automatic Control GIPSA-Lab CNRS NeCS Team Grenoble France

ISBN: (纸本)9781467320658

This paper proposes an event-based scheme to control a networked control system and to manage the radio-modes of its smart sensor node. The smart node is battery driven and is in charge of sensing the system and computing the control law which is sent to the receiver using a wireless channel. To save energy and to limit the amount of communication with the receiver, the smart node combines two techniques: event-based control and radio-mode management. The control law and radio-mode switching policy are derived jointly in a predictive finite receding horizon optimization problem. We derive a Model Predictive controller using Dynamic Programming and we prove the stability of the obtained control law using the Input-to-State Stability framework. The main contribution of this paper is to take into account several low consuming radio-modes, e.g. Idle and Sleep and the energy-transition costs between modes. Most of the existing literature only considers one mode when the radio is not transmitting, i.e., the scheduling problem. As illustrated via simulations, our proposal has the potential of significant energy savings. © 2012 IEEE.

关键词： Networked control systems

来源：评论

学校读者我要写书评

暂无评论

Intermediate Point Norm Optimal Iterative Learning control

Intermediate Point Norm Optimal Iterative Learning Control

引用

IEEE Annual Conference on Decision and control

作者： David H. Owens Chris T. Freeman Thanh Van Dinh Department of Automatic Control and Systems Engineering University of Sheffield School of Electronics and Computer Science University of Southampton

ISBN: (纸本)9781467320658

A Norm-Optimal Iterative Learning control (NOILC) solution is developed for the problem when tracking is only required at a subset of isolated time points along the trial duration. Well-defined convergence properties are presented, along with design guidelines and supporting experimental results using an electromechanical test facility.

关键词： Convergence Feedforward neural networks Eigenvalues and eigenfunctions Frequency modulation State feedback Equations Hilbert space

来源：评论

学校读者我要写书评

暂无评论

A nonlinear voltage controller using T-S fuzzy model for multimachine power systems

A nonlinear voltage controller using T-S fuzzy model for mul...

引用

9th International Multi-Conference on Systems, Signals and Devices, SSD 2012

作者： Abbadi, A. Boukhetala, D. Nezli, L. Kouzou, A. Electrical and Computer Engineering Department Research Laboratory in Electrical Engineering and Automatic LREA University of Medea Algeria Electrical Engineering Department Process Control Laboratory El Harach Polytechnic School Algiers Algeria Electrical Department University Centre of Djelfa Ain Chih BP 3117 Djelfa Algeria

ISBN: (纸本)9781467315906

In this paper we propose a decentralized nonlinear controller that has the ability to enhance the transient stability and achieve voltage regulation simultaneously for multimachine power systems. This paper extends the existing work on the construction of TS fuzzy model using linearly independent functions from nonlinear systems. This approach is based on Takagi-Sugeno (T-S) fuzzy controller via parallel distributed compensation (PDC) method. The stability analysis and control design problems can be reduced to linear matrix inequality (LMI) problems. Based on only local measurements, the designed fuzzy state feedback controller guarantees stability and satisfies desired transient responses. The proposed controller is applied to two-generator infinite bus power system. Simulation results illustrate the performance of the developed approach regardless of the system operating conditions. © 2012 IEEE.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Distributed event-triggered control with network delays and packet losses

Distributed event-triggered control with network delays and ...

引用

IEEE Conference on Decision and control

作者： M. Guinaldo D. Lehmann J. Sánchez S. Dormido K. H. Johansson Department of Computer Science and Automatic Control UNED Spain School of Electrical Engineering Royal Institute of Technology (KTH) Sweden

This paper presents a distributed event-based control approach to cope with communication delays and packet losses affecting a networked dynamical system consisting of N linear time-invariant coupled systems. Two communication protocols are proposed to deal with these communication effects. It is shown that both protocols preserve the system stability in the sense that the state of every subsystem converges to a small region around the origin if the delay and the number of packet losses are bounded. Analytical expressions for the delay bound and the maximum number of consecutive packet losses are derived. Simulations illustrate the results.

关键词： Protocols Delay Nickel Packet loss Upper bound Bismuth

来源：评论

学校读者我要写书评

暂无评论

Distribution-aware mutation analysis

Distribution-aware mutation analysis

引用

36th Annual IEEE International computer Software and Applications Conference Workshops, COMPSACW 2012

作者： Sun, Chang-Ai Wang, Guan Cai, Kai-Yuan Chen, Tsong Yueh School of Computer and Communication Engineering University of Science and Technology Beijing Beijing China Department of Automatic Control Beijing University of Aeronautics and Astronautics Beijing China State Key Laboratory of Computer Science Institute of Software Chinese Academy of Science Beijing China Facuity of Information and Communication Technologies Swinburne University of Technology Melbourne VIC Australia

ISBN: (纸本)9780769547589

Mutation analysis is widely employed to evaluate the effectiveness of various software testing techniques. In most situations, mutation operators are uniformly applied to the original programs, while the faults tend to be clustered in practice. This may result in the inappropriate simulation of faults, and thus cannot deliver the reliable evaluation results. To overcome this, we propose a distribution-aware mutation analysis technique and conducted empirical studies to investigate the impact of the mutation distribution on the effectiveness evaluation of testing techniques. As an illustration, we select the commonly practiced random testing technique and two versions of dynamic random testing techniques and apply them to testing Web services. Results of empirical studies suggest that the mutation distribution significantly affects the evaluation results. This observation further indicates that the effectiveness of testing techniques previously evaluated with the uniform mutation analysis needs further realignments. © 2012 IEEE.

关键词： Software testing

来源：评论

学校读者我要写书评

暂无评论

Improved stability conditions for unconstrained nonlinear model predictive control by using additional weighting terms

Improved stability conditions for unconstrained nonlinear mo...

引用

IEEE Conference on Decision and control

作者： Marcus Reble Daniel E. Quevedo Frank Allgöwer Institute for Systems Theory and Automatic Control (IST) University of Stuttgart Germany School of Electrical Engineering & Computer Science The University of Newcastle Australia

ISBN: (纸本)9781467320658

In this work, we present two unconstrained MPC schemes using additional weighting terms which allow to obtain improved stability conditions. First, we consider unconstrained MPC with general terminal cost functions. If the terminal cost is not a control Lyapunov function, but satisfies a relaxed condition, then our results yield improved estimates for a stabilizing prediction horizon. Furthermore, our analysis also allows to recover two well-known results as special cases: if the terminal cost function is chosen as zero, we recover previous conditions on the length of the prediction horizon such that stability is guaranteed; and if the terminal cost is a control Lyapunov function conform to the stage cost, stability follows independently of the length of the prediction horizon. Second, we propose to use an exponential weighting on the stage cost in order to improve the stability properties of the closed-loop. This also allows to consider local controllability assumptions in combination with a suitable terminal constraints and thereby gives a connection to the classical MPC approaches using terminal constraints.

关键词： Asymptotic stability controllability Trajectory Cost function Lyapunov methods Stability criteria

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：