检索结果-内蒙古大学图书馆

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Y. Ruichek H. Issa J.G. Postaire J.C. Burie Systems and Transportation Laboratory University of Technology of Belfort-Montbéliard Belfort France Control Computer Engineering and Signal Laboratory University of Science and Technology of Lille Villeneuve d'Ascq France Computer Science Image and Interaction Laboratory University of La Rochelle La Rochelle France

This work is concerned with the stereo matching problem for real-time obstacle detection. The correspondence problem is viewed as an optimization task where the objective is to find a solution for which the matches are as compatible as possible with respect to specific constraints. The optimization process is performed by means of a genetic algorithm with a new encoding scheme. For an effective exploitation of the genetic algorithm for real-time obstacle detection, a multilevel searching strategy is proposed in order to speed-up the stereo matching process. The multilevel searching strategy consists of matching the edges at different levels by considering their gradient magnitudes. The performance of the proposed multilevel genetic stereo matching procedure is evaluated for real-time obstacle detection in front of a moving vehicle using linear stereo vision.

关键词： Genetic algorithms Stereo vision Layout Cameras Laboratories Vehicle detection Vehicles Data mining computer vision Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Discrete-time Arimoto ILC-algorithm revisited

引用

IFAC Proceedings Volumes 2004年第12期37卷 541-546页

作者： J. Hätönen T.J. Harte D.H. Owens J. Ratcliffe P. Lewin E. Rogers Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom

This paper revisits the Arimoto-algorithm in the discrete-time case. It is shown that if a plant satisfies a positivity condition, there always exists a learning gain so that the algorithm converges monotonically to zero tracking error. If the plant does not satisfy the positivity condition, a linear LQ tracker can be used to condition the plant so that it satisfies the positivity condition. The overall structure results in a novel combination of Arimoto ILC and LQ optimal control, that drives the tracking error monotonically to zero for an arbitrary discrete-time LTI plant. This is a very strong property for any ILC algorithm.

关键词： Iterative learning control positive-real systems

来源：评论

学校读者我要写书评

暂无评论

Iterative Learning control - What is it all about?

引用

IFAC Proceedings Volumes 2004年第12期37卷 547-553页

The main objective of this paper is to show how one can benefit from using Iterative Learning control instead of conventional feedback control. As a main result it is shown that even if the nominal plant satisfies a given uncertainty condition, there always exists ILC algorithms that can drive the tracking error monotonically to zero. This same result cannot be achieved with conventional feedback control, or by inverting a nominal model of the plant. Hence ILC offers an unique tool to invert dynamical systems with uncertainty.

关键词： Iterative learning control robust control positive-real systems

来源：评论

学校读者我要写书评

暂无评论

Robustness of dual-rate inferential MPC systems

Robustness of dual-rate inferential MPC systems

引用

American control Conference (ACC)

作者： J.A. Rossiter J. Sheng T. Chen S.L. Shah Department of Automatic Control & Systems Engineering Sheffield University Sheffield UK Coordinated Science Laboratory University of Illinois Urbana USA Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada Department of Chemical & Materials Engineering University of Alberta Edmonton AB Canada

This paper investigates the robustness of dual-rate MPC systems with a proposed inferential control strategy. It shows that for some scenarios where a high-frequency model plant mismatch is presented, such dual-rate i... 详细信息

关键词： Robustness Robust stability Predictive models Robust control control systems Predictive control Strontium control system analysis Integrated circuit modeling Time varying systems

来源：评论

学校读者我要写书评

暂无评论

Unified, periodic & sampled data H/sub /spl infin// control using the delta operator

Unified, periodic & sampled data H/sub /spl infin// control ...

引用

IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden

A unified and general framework is presented for H/sub /spl infin// control of mixed continuous-time and discrete-time time-varying (periodic) systems. Using the delta operator, a close relationship is shown between the continuous- and discrete-time solutions. No assumptions are made on certain system matrices being zero or normalized, which makes the approach general and easy to apply. A combined continuous/discrete-time lifting procedure is shown to be useful, especially for ill-conditioned systems. This procedure together with the delta formalism results in a numerically robust design method concerning both short and long sampling periods for systems with W-conditioned dynamics, including widely spread eigenvalues.

关键词： control systems Sampling methods Riccati equations automatic control Robustness Design methodology Eigenvalues and eigenfunctions Differential equations Automation Laboratories

来源：评论

学校读者我要写书评

暂无评论

SELF-POWERED WIRELESS TEMPERATURE SENSING USING MEMS-BASED AA-SIZE ENERGY TRANSDUCER

引用

International Journal of Information Acquisition 2004年第2期1卷 121-128页

作者： JOHNNY M. H. LEE STEVE C. L. YUEN MIMI H. M. LUK GORDON M. H. CHAN KING FONG LEI WEN J. LI PHILIP H. W. LEONG YEUNG YAM Centre for Micro and Nano Systems The Chinese University of Hong Kong Hong Kong SAR China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong SAR China Intelligent Control Systems Laboratory The Chinese University of Hong Kong Hong Kong SAR China

This paper presents the design and experimental results of a Micro Power Generator (MPG) which harvests mechanical energy from its environment and converts this energy into useful electrical power. The energy transduction component is mainly a magnet and a resonating spring made using SU-8 molding and MEMS electroplating technologies. We have shown that when the MPG is packaged into an AA battery size container along with a power-management circuit that consists of rectifiers and a capacitor, it is capable of producing ~1.6 V DC when charged for less than 1 min. Our goal is to realize a MPG to function with low input mechanical frequencies while producing enough power for low-power wireless applications.

关键词： Micro power generator micro energy transducer high-aspect-ratio MEMS SU-8 processing

来源：评论

学校读者我要写书评

暂无评论

Experimental evaluation of a new repetitive control algorithm on a non-minimum phase spring-mass-damper system

引用

IFAC Proceedings Volumes 2004年第12期37卷 681-686页

作者： C.T. Freeman J.J. Hätönen P.L. Lewin D.H. Owens E. Rogers School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44(0)2380 593709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

Recently, a novel optimality based Repetitive control algorithm was proposed in (Hätönen et al. , 2003). According to the convergence analysis carried out in that paper, the algorithm will result in asymptotic convergence for an arbitrary discrete-time LTI plant and a T -periodic reference. However, the performance of the algorithm was tested only using simulation studies. In order to rigorously test how the algorithm performs with real systems, in this paper the algorithm is implemented on a non-minimum phase spring-mass-damper system. The results are very satisfactory, because the algorithm results in near perfect tracking with this rather demanding plant type.

关键词： Repetitive control Optimal control Polynomial systems Theory Non-Minimum Phase systems

来源：评论

学校读者我要写书评

暂无评论

Low order sampled data H/sub /spl infin// control using the delta operator and LMIs

Low order sampled data H/sub /spl infin// control using the ...

引用

IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson T. McKelvey Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

A procedure for H/sub /spl infin// optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H/sub /spl infin// controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.

关键词： control systems Linear matrix inequalities Sampling methods automatic control Frequency Weight control Robust control Signal processing State-space methods Robustness

来源：评论

学校读者我要写书评

暂无评论

Practical implementation of a model inverse optimal iterative learning controller

引用

IFAC Proceedings Volumes 2004年第12期37卷 687-692页

作者： J.D. Ratcliffe T.J. Harte J.J. Hätönen P.L. Lewin E. Rogers D.H. Owens School of Electronics and Computer Science University of Southampton University Road Southampton SO17 1BJ United Kingdom Fax: +44 (0)23 8059 3709 Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Systems Engineering Laboratory The University of Oulu P.O. BOX 4300 FIN-90014 University of Oulu Finland

In this paper, a new model inverse optimal iterative learning control algorithm is practically implemented on an industrial gantry robot. The algorithm has only one tuning parameter which can be adjusted to provide a balance between convergence speed and robustness. Results show that the algorithm is capable of learning the required trajectory in very few iterations. However at this convergence rate the lack of robustness is a major issue. Appropriate use of the tuning parameter is shown to greatly increase the algorithm robustness as demonstrated by tests which successfully reach 600 iterations.

关键词： Learning control Iterative methods Optimal control

来源：评论

学校读者我要写书评

暂无评论

Quadratic stability of process systems in generalized lotka-volterra form

引用

IFAC Proceedings Volumes 2004年第13期37卷 1217-1222页

作者： A. Magyar G. Szederkényi K.M. Hangos Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute HAS H-1518 P.O. Box 63 Budapest Hungary Tel.: +361 2796000； fax: +361 466 7503 Department of Computer Science University of Veszprém H-8200 Egyetem u. 10 Veszprém Hungary Tel.: +***； fax: +***

The global and local stability of process systems in generalized Lotka-Volterra form is studied in this paper using entropy-like and quadratic Lyapunov function candidates. The global stability check for LV models is performed by solving an LMI for a diagonal positive semi-definite matrix using singular perturbation technique. It is shown that a quadratic Lyapunov function can also be determined by solving linear matrix inequalities (LMIs). In addition, the quadratic stability neighborhood is convex in the space of the quasi-monomials and can be estimated by computing its corner points using LMIs. Furthermore, it is proved that quadratic stability with a diagonal weighting matrix enables to construct a dissipative-Hamiltonian description of the system. The developed methods are illustrated on the model of a continuously stirred tank reactor with a nonlinear reaction system.

关键词： quasi-polynomial systems Lotka-Volterra systems stability analysis linear matrix inequalities Hamiltonian systems

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：