检索结果-内蒙古大学图书馆

IEEE Conference on Decision and control

作者： Jun Wu Sheng Chen J.F. Whidborne Jian Chu National Key Laboratory of Industrial Control Technology Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Southampton UK Department of Mechanical Engineering King''s College London UK

ISBN: (纸本)0780375165

The paper investigates the closed-loop stability issue of finite-precision realizations for digital controllers implemented in floating-point arithmetic. Unlike the existing methods which only address the effect of the mantissa bits in floating-point format to the sensitivity of closed-loop stability, the sensitivity of closed-loop stability is analyzed with respect to both the mantissa and exponent bits of floating-point format. A computationally tractable finite word length (FWL) closed-loop stability measure is defined, and the optimal controller realization problem is posed as searching for a floating-point realization that maximizes the proposed measure. A numerical optimization approach is adopted to solve for the resulting optimization problem. Simulation results show that the proposed design procedure yields computationally efficient controller realizations with enhanced FWL closed-loop stability performance.

关键词： Optimal control Digital control Stability Floating-point arithmetic Length measurement Design methodology Uncertainty Laboratories Industrial control Process control

来源：评论

学校读者我要写书评

暂无评论

An optimal attitude control of small satellite with momentum wheel and magnetic torquerods

An optimal attitude control of small satellite with momentum...

引用

World Congress on Intelligent control and Automation (WCICA)

作者： Zhang Fan Shang Hua Mu Chundi Lu Yuchang Department of Computer Science and Technology Tsinghua University Beijing China Qingdao Branch Naval Aeronautic Engineering College Qingdao Shandong China Department of Automatic Control Tsinghua University Beijing China

In order to improve the pointing accuracy of a small satellite, the attitude control system is controlled with pitch-axis momentum and three-axis magnetic torquerods. The satellite dynamics equation and kinematic equation are built with the method of quaternion. For each of the three body axes, well-known PD control torque equations are adopted. Three position, three rate, and a dumping control gains are optimally found by building up the optimal attitude control model. In the model, two single objectives: the minimum of the transient time and the minimum of the sum of both the square sum of the attitude angle error and the square sum of the angle rate error are integrated into the multi objectives with multiobjective optimization method. The constraints require that the attitude angle, the angle rate, the three-axis dipole moment and the pitch wheel momentum should not exceed the required value. Finally, an application to the attitude control of a small satellite is presented as an example. Results show that the optimal control algorithm is feasible, effective, and reliable, and attitude control performance is also significantly improved after optimization, compared to the traditional PD control.

关键词： Satellites Wheels Magnetic moments Equations PD control Optimal control Torque control control systems Kinematics Quaternions

来源：评论

学校读者我要写书评

暂无评论

Complexity in UAV cooperative control

Complexity in UAV cooperative control

引用

American control Conference (ACC)

作者： P.R. Chandler M. Pachter D. Swaroop J.M. Fowler J.K. Howlett S. Rasmussen C. Schumacher K. Nygard Flight Control Division AFRL VACA USA Department of Elec & Computer Engineering AFIT/ENG USA Department of Mechanical Engineering Texas A and M University College Station TX USA Sibley School of Mech and Aero Engineering Cornell University Ithaca NY USA Department of Mechanical Engineering Brigham Young University Provo UT USA Veridian Dayton OH USA Department of Computer Science and Operations Research North Dakota State University Fargo ND USA

This paper addresses complexity and coupling issues in cooperative decision and control of distributed autonomous unmanned aerial vehicle (UAV) teams. In particular, the recent results obtained by the inhouse research team are presented. Hierarchical decomposition is implemented where team vehicles are allocated to sub-teams using the set partition theory. Results are presented for single assignment and multiple assignments using the network flow and auction algorithms. Simulation results are presented for wide area search munitions where complexity and coupling are incrementally addressed in the decision system, yielding a radically improved team performance.

关键词： Unmanned aerial vehicles Weapons Aerospace control Operations research Costs Distributed computing Mechanical engineering computer science Neodymium Distributed control

来源：评论

学校读者我要写书评

暂无评论

Random walk approach to noise reduction in color images 9th

引用

9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

作者： Smolka, B. Szczepanski, M. Plataniotis, K.N. Venetsanopoulos, A.N. Silesian University of Technology Department of Automatic Control Akademicka 16 Str Gliwice44-101 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

ISBN: (纸本)9783540425137

In this paper we propose a new algorithm of noise reduction in color images. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and on a fuzzy similarity measure between pixels connected by a digital self avoiding path is introduced. The efficiency of the proposed method was tested on the test color image using the objective image quality measures and the results show that the new method outperforms standard noise reduction algorithms. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Noise abatement

来源：评论

学校读者我要写书评

暂无评论

Fast modified vector median filter 9th

引用

9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

ISBN: (纸本)9783540425137

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented in this paper. The computational complexity of the new filter is signif- icantly lower than that of the Vector Median Filter. The comparison shows that the new filter outperforms the VMF, as well as other standard procedures used in color image processing, when the impulse noise is to be eliminated. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Impulse noise

来源：评论

学校读者我要写书评

暂无评论

Geodesic paths approach to color image enhancement

Geodesic paths approach to color image enhancement

引用

IWCIA 2001, 8th International workshop on Combinatorial Image Analysis

作者： Szczepanski, M. Smolka, B. Slusarczyk, D. Plataniotis, K.N. Venetsanopoulos, A.N. Department of Automatic Control Silesian University of Technology Akademicka 16 Str 44-101 Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

New filter class for multichannel image processing is introduced and analyzed. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it significantly outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and a fuzzy similarity measure between pixels connected by a digital geodesic path is introduced. The efficiency of the proposed method was tested on the standard color images using the objective image quality measures. Obtained results show that the new method not only outperforms standard noise reduction algorithms, but has some interesting features useful for segmentation of noisy color images. © 2001 Published by Elsevier Science B.V.

关键词： Geodesy

来源：评论

学校读者我要写书评

暂无评论

The residual magnetic field method for inspection of a reverse-side crack on a thick steel plate

引用

AIP Conference Proceedings 2001年第1期557卷 1724-1731页

作者： M. Oka M. Enokizono 1Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan 2Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 Japan

In order to detect small reverse-side cracks existing on 5 mm thick steel plates, we have measured strength of residual magnetization at 1 mm above 5 mm thick steel plates. A differential type magneto-impedance effect sensor (a gradio-MI sensor) is applied to measure it. Because the gradio-MI sensor is suitable for detection of localized micro magnetic field. From results of our experiments, a distribution of the residual differential magnetic field at 1 mm above a specimen is clearly changed near a reverse-side crack of 1 mm depth with 5 mm length. In this paper, experimental results utilizing the distribution of a residual differential magnetic field measured by gradio-MI sensors is shown. And, validity of the residual magnetic field method for inspection of small reverse-side cracks on thick steel plates is discussed.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A public cryptosystem based on the generated data in extension set

A public cryptosystem based on the generated data in extensi...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Kaiquan Shi Yo-Ping Huang College of Control Science and Engineering Shandong University Jinan Shandong P.R.C Dept. of Computer Science and Engineering Tatung University Taipei Taiwan R.O.C.

ISBN: (纸本)0780370872

Assume X/sup #/ is an extension set in the domain U. Let X/sup A/, X/sup B/ be the positive domain of X/sup #/ in which X/sup A//spl sub/X/sup #/, X/sup B//spl sub/X/sup #/, and X/sup A//spl ne/X/sup B/. X/sup A/={x/sub 1//sup A/, x/sub 2//sup A/, ..., x/sub n//sup A/}, X/sup B/={x/sub 1//sup B/, x/sub 2//sup B/, ..., x/sub n//sup B/}. /spl forall/x/sub 1//sup A/, x/sub 1//sup B//spl isin/N/sup +/, |X/sup A/|/spl ges/4, |X/sup B/|/spl ges/4. By using the accumulated generating operation, we can obtain a mathematical model from X/sup A/ and X/sup B/. From the mathematical model we also derive the sets of X'/sub A/ and X'/sub B/. Both X'/sub A/ and X'/sub B/ are the extended domains of X/sup #/. There exist polynomials p/sup A/(x), p/sup B/(x); and p/sup AB/(x) from X'/sub A/, X'/sub B/, and X/sup AB/, respectively. Based on the p/sup A/(x), p/sup B/(x), and p/sup AB/(x), we propose a new public cryptosystem. In the presented system, we have a public cryptography system from generated data in extension set X/sup #/, a public cryptosystem from two generated data in extension set X/sup #/, and a public cryptosystem from hybrid generated data in extension set X/sup #/. The proposed model is a secure system. Both sides in the communication system can depend on the proposed cryptosystem to fulfill the cryptography of the to-be-transmitted file and de-cryptograph of the cryptograph.

关键词： Cryptography Mathematical model Set theory Hybrid power systems Information systems Information security Educational institutions Polynomials Communication systems Communication system security

来源：评论

学校读者我要写书评

暂无评论

control of process with time delay 6

Control of process with time delay

引用

6th European control Conference, ECC 2001

作者： Prempain, E. Madelaine, F. Charmail, S. Control and Instrumentation Group Department of Engineering University of Leicester LeicesterLE1 7RH United Kingdom Department of Mathematics and Computer Science University of Leicester LeicesterLE1 7RH United Kingdom Q.A. College Victoria Park Road LeicesterLE1 United Kingdom

ISBN: (纸本)9783952417362

In this paper the robustness of the Smith predictor is discussed. An extension of the time delay tolerance is given for systems presenting an open-loop frequency response with multiple unity gain crossover frequencies. A two-degree-of-freedom decoupling scheme is proposed to independently adjust set point and load disturbance responses. Classical design tools (PI, PID) can be used to design the feedback part of the controller. The effectiveness of the method is demonstrated on a numerical example which shows that the nominal performance of our design is similar to the Smith predictor performance but with better robustness properties. © 2001 EUCA.

关键词： Time delay

来源：评论

学校读者我要写书评

暂无评论

The optimization of traffic signal light using artificial intelligence

The optimization of traffic signal light using artificial in...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： GiYoung Lim JeongJin Kang YouSik Hong Department of control & Institute Engineering Hanbat University Daejeon South Korea Department of Information Communication Engineering Dong Seoul College Gyeongnam South Korea Department of Computer Science Sangji University Wonju South Korea

In the past, when there were few vehicles on the road, the TOD (time of day) traffic signal worked very well. The TOD signal operates on a preset signal cycling which cycles on the basis of the average number of average passenger cars in the memory device of an electric signal unit. Nowadays, with increasing vehicles on restricted roads, the conventional traffic light creates prove startup-delay time and end-lag-time. The conventional traffic light loses the function of optimal cycle, so 30-45% of the conventional traffic cycle is not matched to the present traffic cycle. We propose an electrosensitive traffic light using a fuzzy look up table method which will reduce the average vehicle waiting time and improve average vehicle speed. computer simulation results prove that reducing the average vehicle waiting time is better than than fixed signal method which doesn't consider vehicle length.

关键词： Artificial intelligence Traffic control Road vehicles Fuzzy logic Telecommunication traffic Delay effects Fuzzy set theory Educational institutions computer science computer simulation

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：