检索结果-内蒙古大学图书馆

International Conference on Automatic Face and Gesture Recognition

作者： N.P. Costen M. Brown S. Akamatsu Department of Computing and Mathematics Manchester UK Department of Systems Control Engineering Hosei University Tokyo Japan

A class of sparse regularization functions is considered for the developing sparse classifiers for determining facial gender. The sparse classification method aims to both select the most important features and maximize the classification margin, in a manner similar to support vector machines. An efficient process for directly calculating the complete set of optimal, sparse classifiers is developed. A single classification hyper-plane, which maximizes posterior probability of describing training data, is then efficiently selected. The classifier is tested on a Japanese gender-divided ensemble, described via a collection of appearance models. Performance is comparable with a linear SVM, and allows effective manipulation of apparent gender.

关键词： Support vector machines Support vector machine classification Robustness Training data Face recognition Mathematics control engineering Testing Image processing Computer vision

来源：评论

学校读者我要写书评

暂无评论

Efficient calculation of the complete optimal classification set

Efficient calculation of the complete optimal classification...

引用

International Conference on Pattern Recognition

作者： M. Brown N.P. Costen S. Akamatsu UMIST Manchester UK MMU Computing and Mathematics Manchester UK Systems Control Engineering Hosei University Tokyo Japan

Feature and structure selection is an important part of many classification problems, in previous papers, an approach called basis pursuit classification has been proposed which poses feature selection as a regularization problem using a 1-norm to measure parameter complexity. In addition, a complete optimal parameter set, here called the locus, can be calculated which contains every optimal collection of sparse features as a function of the regularization parameter. This paper considers how to iteratively calculate the parameter locus using a set of rank-1 inverse matrix updates. The algorithm is tested on both artificial and real data and it is shown that the computational cost is reduced from a cubed to a squared problem in the number of features.

关键词： Face detection Sparse matrices Support vector machines Support vector machine classification control systems Mathematics control engineering Iterative algorithms Testing Computational efficiency

来源：评论

学校读者我要写书评

暂无评论

Hough transform based correction of mobile robot orientation

Hough transform based correction of mobile robot orientation

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： L. Banjanovic-Mehmedovic I. Petrovic E. Ivanjko Faculty of Electrical Engineering University of Tuzla Tuzla Bosnia and Herzegovina Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

In most applications, a mobile robot must be able to determine its position and orientation in the environment using only own sensors. The problem of pose tracking can be seen as a constituent part of the more general navigation problem. Our proposed approach is able to track the mobile robot pose without environment model. It is based on combining histograms and Hough transform (HHT). While histograms for position tracking (x and y histograms) are extracted directly from local occupancy grid maps, angle histogram is obtained indirectly via Hough transformation combined with a non-iterative algorithm for determination of end points and length of straight-line parts contained in obtained histograms. Histograms obtained at the actual mobile robot pose are compared to histograms saved at previous mobile robot poses to compute position displacement and orientation correction. Orientation estimation accuracy greatly influences the position estimation accuracy and is crucial for a reliable mobile robot pose tracking. Sensors used for local occupancy grid generation are sonars but other exteroceptive sensors like a laser range finder can also be used. Test results with mobile robot Pioneer 2DX simulator show the capacity of this method.

关键词： Mobile robots Histograms Magnetic noise Robot kinematics Dead reckoning control engineering computing Robotics and automation Robot sensing systems Motion planning Mesh generation

来源：评论

学校读者我要写书评

暂无评论

On-Line Recognition of Metabolic State of Baker's Yeast Culture

引用

IFAC Proceedings Volumes 2004年第3期37卷 397-402页

作者： P. Hrnčiřik J. Vovsík J. Náhlík Department of Computing and Control Engineering Institute of Chemical Technology Prague Technická 5 166 28 Prague 6 Czech Republic fax: +420 224 355 053

This paper presents the comparison of two approaches based on artificial intelligence techniques solving the task of on-line recognition of metabolic state of baker's yeast culture in a fed-batch cultivation. The first approach iS represented by a knowledge-based system containing expert knowledge in the form of production rules. The other approach is based on the application of the fuzzy neural network paradigm enabling the automatic extraction of the recognition rules from. experimental data. Performance of both approaches is discussed using results obtamed from tests on experimental data from a laboratory cultivation unit.

关键词： Fermentation processes Fuzzy systems Neural networks Recognition Rule-based systems

来源：评论

学校读者我要写书评

暂无评论

Electronic throttle state estimation and hybrid theory based optimal control

Electronic throttle state estimation and hybrid theory based...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： M. Vasak M. Baotic I. Petrovic N. Peric Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Automatic Control Laboratory ETH-Swiss Federal Institute of Technology Zürich Zurich Switzerland

Electronic throttle body (ETB) is a car device that regulates air inflow into the motor's combustion system. Its performance has a major impact on the quality of the overall engine speed control. However, due to the usage of cheap components and some design features the ETB exhibits several nonlinear phenomena. This nonlinear behavior and the fact that there is only one measurement available - low quality measurement of the throttle position makes a design of the throttle controller a challenging task. Our approach is to model the ETB as a discrete time piecewise affine (PWA) system and apply model predictive control (MPC) strategy to design an explicit state feedback control law. Since MPC is a full-state controller and there is only one measurement available the rest of the states have to be estimated. We have chosen unscented Kalman filter (UKF) for the estimation purpose since it was performing the best in the presence of strong, almost discontinuous, process nonlinearities. In the end, MPC and UKF algorithm were implemented and tested on the real electronic throttle for the case of set-point reference. Experimental results indicate that the performance of cheaply produced components can be significantly improved with a good control strategy.

关键词： State estimation Optimal control Position measurement Predictive models Combustion Engines Velocity control Predictive control State feedback Electronic equipment testing

来源：评论

学校读者我要写书评

暂无评论

Diagnostics capabilities of foundation fieldbus pressure transmitters

引用

Chemical engineering World 2004年第6期39卷 44-54页

作者： Szanyi, Ron Raterman, Mike Eryurek, Evren Instrum and Control Projects Section ExxonMobil Research and Engineering Plant Automat and Computing Division Fairfax VA United States ExxonMobil Research and Engineering Fairfax VA United States Emerson Process Management St. Louis MO United States

Over the past two years ExxonMobil Research and engineering group, along with Emerson Process Management, have tested the self-diagnostic capabilities of pressure transmitters with FOUNDATION FIELDBUS (FF) capability while installed on a fluid catalytic cracking (FCC) unit in an operating refinery. This project involved conducting a series of tests on the ability of the devices to diagnose plugged impulse lines.

关键词： Diagnosis

来源：评论

学校读者我要写书评

暂无评论

Improved line-of-sight guidance for cruising underwater vehicles

引用

IFAC Proceedings Volumes 2004年第10期37卷 447-452页

作者： Vedran Bakaric Zoran Vukic Radovan Antonic Brodarski institut Av. V. Holjevca 20 10020 Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb Croatia Split College of Maritime Studies Zrinsko-Frankopanska 38 21000 Split Croatia

Guidance through waypoints is common for small autonomous marine vehicles. Guidance by the line of sight, which turns the vehicle directly towards the next waypoint without any reference path calculation, is computationally the simplest form of waypoint guidance. However, the basic algorithm gives rather poor guidance due to the missed waypoint problem, lack of sea current compensation and abrupt transitions between the consecutive waypoints. Significant path deviations and even deadlocks are possible due to these problems. Therefore, more complex algorithms are usually used in real world applications. The research reported in this paper aims to demonstrate that significant improvements of the basic line-of-sight guidance algorithm can be achieved by several intuitive, simple corrections and additions. The simplicity of the basic line-of-sight guidance algorithm is not compromised. In particular, missed waypoint detection is performed by monitoring the distance between the vehicle and the waypoint. Introduced reference heading corrections are based upon the location of the next waypoint after the one the vehicle is currently approaching, and upon the sea current direction and intensity. The results of these corrections are shown in several simulation examples. In addition, the paper includes a short discussion about the line-of-sight guidance in the diving plane.

关键词： Autonomous vehicles Guidance systems Cruise control Algorithms

来源：评论

学校读者我要写书评

暂无评论

Restricted frequency inequality is equivalent to restricted dissipativity

Restricted frequency inequality is equivalent to restricted ...

引用

IEEE Conference on Decision and control

作者： T. Iwasaki S. Hara A.L. Fradkov Department of Mechanical and AeroSpace Engineering University of Virginia Charlottesville VA USA Department of Information Physics and Computing University of Tokyo Bunkyo Tokyo Japan Control of Complex Systems Laboratory Institute for Problems of Mechanical Engineering Saint Petersburg Russia

A variety of powerful tools and results in systems and control theory rely on classical Kalman-Yakubovich-Popov-Zames results establishing equivalence between special frequency domain inequalities (FDIs), linear matrix inequalities (LMIs) and time domain inequalities (TDIs). Recent developments have addressed FDIs within (semi)finite frequency ranges to increase flexibility in the system analysis and synthesis. In this paper it is shown that validity of a general FDI within a restricted frequency range is equivalent to validity of the corresponding TDI under rate limitations specified by a matrix-valued integral quadratic constraint. The latter property of a system is termed "restricted dissipativity". Its special cases are "restricted passivity" and "restricted finite gain property". The equivalence between restricted FDI and restricted dissipativity is established for both continuous-time and discrete-time settings. The paper together with the previous developments extends Kalman-Yakubovich-Popov-Zames FDI-LMI-passivity results to FDIs specified within restricted frequency ranges.

关键词： Fault detection Frequency domain analysis Linear matrix inequalities Symmetric matrices control theory Frequency synthesizers control system synthesis Physics education Educational technology Aerospace engineering

来源：评论

学校读者我要写书评

暂无评论

Certainty equivalence in constrained linear systems subject to stochastic disturbances

Certainty equivalence in constrained linear systems subject ...

引用

American control Conference (ACC)

作者： I. Batina A.A. Stoorvogel S. Weiland Department of Electrical Engineering Mathematics and Computer Delft University of Technnology Delft Netherlands Department of Mathematics and Computing Science Eindhovan University of Technology Eindhoven Netherlands Control Systems Group Department of Electronical Engineering Eindhovan University of Technology Eindhoven Netherlands

A sufficient condition is provided under which the optimal controller of a constrained optimization problem can be synthesized by combining an optimal state estimator with an optimal static state feedback. An application of a model predictive controller is considered that involves both input and state constraints in a system that is subject to stochastic disturbances.

关键词： Linear systems Stochastic systems State feedback State estimation control systems Optimal control Constraint optimization Q measurement Noise measurement Stochastic processes

来源：评论

学校读者我要写书评

暂无评论

Multiagent planning as control synthesis

Multiagent planning as control synthesis

引用

Proceedings of the International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS

作者： Kiam-Tian Seow Chuan Ma M. Yokoo Division of Computing Systems School of Computer Engineering Nanyang Technological University Singapore Systems Control Group University of Toronto Toronto ONT Canada Department of Intellignet Systems Kyushu University Fukuoka Japan

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：