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MILESTONE REPORT COORDINATING COMMITTEE ON COMPUTER control

IFAC Proceedings Volumes 2002年第1期35卷 217-225页

作者： Henk B. Verbruggen Jaehyun Park Wolfgang Halang George Irwin Janusz Zalewski Faculty of Information Technology and systems Delft University of Technology Delft the Netherlands Department of Automation Engineering Inha University Inchon Korea Faculty of Electrical Engineering Fern Universität Hagen Germany Intelligent Control and Systems Group School of Electrical and Electronic Engineering Queen's University Belfast UK Department of Electrical and Computing Engineering University of Central Florida Orlando USA

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Software quality knowledge discovery: a rough set approach

Software quality knowledge discovery: a rough set approach

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IEEE Annual International Computer Software and Applications Conference (COMPSAC)

作者： S. Ramanna J.F. Peters T. Ahn Department of Business Computing University of Winnipeg Winnipeg MAN Canada Department of Electrical and Computer Engineering University of Manitoba Winnipeg MAN Canada Intelligent Information Control & System Lab School of Electrical & Electronic Engineering Wonkwang University Iksan South Korea

This paper presents a practical knowledge discovery approach to software quality and resource allocation that incorporated recent advances in rough set theory, parameterized approximation spaces and rough neural computing. In addition, this research utilizes the results of recent studies of software quality measurement and prediction. A software quality measure quantifies the extent, to which some specific attribute is present in a system. Such measurements are considered in the context of rough sets. This research provides a framework for making resource allocation decisions based on evaluation of various measurements of the complexity of software. Knowledge about software quality is gained when preprocessing during which, software measurements are analyzed using discretization techniques, genetic algorithms in deriving reducts, and in the derivation of training and testing sets, especially in the context of the rough sets exploration system (RSES) developed by the logic group at the Institute of Mathematics at Warsaw University. Experiments show that both RSES and rough neural network models are effective in classifying software modules.

关键词： Software quality Software measurement Resource management Rough sets Logic testing Set theory Algorithm design and analysis Genetic algorithms Software testing system testing

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Optimal genetic representation of complete strictly-layered feedforward neural networks

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6th International Work-Conference on Artificial and Natural Neural Networks, IWANN 2001

作者： Raptis, Spyros Tzafestas, Spyros Karagianni, Hermione Intelligent Robotics and Automation Laboratory Division of Signals Control and Robotics Department of Electrical and Electronic Engineering National Technical University of Athens Zographou Campus Athens15773 Greece

ISBN: (纸本)9783540422372

The automatic evolution of neural networks is both an attractive and a rewarding task. The connectivity matrix is the most common way of directly encoding a neural network for the purpose of genetic optimization. However, this representation presents several disadvantages mostly stemming from its inherent redundancy and its lack of robustness. We propose a novel representation scheme for encoding complete strictly-layered feedforward neural networks and prove that it is optimal in the sense that it utilizes the minimum possible number of bits. We argue that this scheme has a number of important advantages over the direct encoding of the connectivity matrix. It does not suffer from the curse of dimensionality, it allows only legal networks to be represented which relieves the genetic algorithm from a number of checking and rejections, and the mapping from the genotypes to phenotypes is one-to-one. Additionally, the resulting networks have a simpler structure assuring an easier learning phase. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Genetic algorithms

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High Speed Indoor Navigation of Mobile Robots Using Hybrid Dynamic control Approach

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IFAC Proceedings Volumes 2001年第4期34卷 257-262页

作者： Mee-Seub Lim Sang-Rok Oh Joonhong Lim Dept. of Mechatronics Kyonggi Institute of Technology Intelligent System Control Research Center Korea Institute of Science and Technology Department of Electronic Engineering Hanyang University

In this paper, we propose a new approach to the high-speed navigation of the indoor environments for wheeled mobile robots using hybrid dynamic control approach. The proposed hybrid system consists of the discrete state system as the high-level process and the continuous state system as the low-level process. In discrete state system, the di crete states are defined by the user-defined constraints and the abstracted motions specify the reference motion commands of mobile robots. The experimental results show that hybrid system approach is an effective method for the autonomous navigation and highspeed maneuvering.

关键词： Mobile Robot High-Speed Indoor Navigation Hybrid Dynamic control

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A cage induction generator using back to back PWM converters for variable speed grid connected wind energy system

A cage induction generator using back to back PWM converters...

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Annual Conference of Industrial electronics Society

作者： R. Pena R. Cardenas R. Blasco G. Asher J. Clare Department of Electrical Engineering University of Magallanes Arenas Chile Department of System Engineering and Automation Polytechnic University of Valencia Valencia Spain School of Electrical & Electronic Engineering University of Nottingham Nottingham UK

A new control scheme of a variable speed grid connected wind energy generation system is presented. The scheme uses a cage induction generator driven by an emulated wind turbine with two back-to-back voltage-fed PWM inverters to interface the generator and the grid. The machine currents are controlled using an indirect vector control technique. The generator torque is controlled to drive the machine to the speed for maximum wind turbine aerodynamic efficiency. The supply side converter currents are also controlled using a vector approach using a reference frame aligned with stator voltage vector. The DC link voltage of the power electronics interface is controlled acting upon the supply active power current component using a nonlinear control and a fuzzy based interpolation of linear PI controllers to improve the disturbance rejection and meet noise considerations in steady state. Experimental validation of the proposed control scheme on an emulated 3.2 kW wind energy system is shown.

关键词： Induction generators Pulse width modulation converters Voltage control Wind energy generation control systems Wind turbines Current supplies Vectors Pulse width modulation inverters Mesh generation

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New development on tracking algorithm with derivation measurement

New development on tracking algorithm with derivation measur...

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IEEE International Conference on systems, Man and Cybernetics

作者： Yaping Dai Guanghui Yu Kotaro Hirasawa Department of Electrical and Electronic System Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Japan Department of Automatic Control Beijing Institute of Technology China

We present a new observation model to improve the state estimation and prediction in a target tracking problems. There are two distinguished points in this approach. First, the measurement equation is set up in the polar coordinate and even combines the derivation measurement (range rate, azimuth rate, and elevation rate) with the usual position measurements (range, azimuth angle, and elevation angle). Next, the observation noise of sensor data is considered as a colored one and is being set up as a model of AR(1), by means of a pseudo measurement equation, and the requirement of Kalman filter can be satisfied. As a result, the accuracy of both the observation and prediction is increased.

关键词： Noise measurement Equations Coordinate measuring machines Colored noise Position measurement Target tracking Azimuth Radar tracking White noise Electric variables measurement

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High-speed wall following and obstacle avoidance of wheeled mobile robots using hybrid behavior specifications

High-speed wall following and obstacle avoidance of wheeled ...

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IEEE International Symposium on Computational Intelligence in Robotics and automation (CIRA)

作者： Mee-Seub Lim Joonhong Lim Sang-Rok Oh Department of Mechatronics Kyonggi Institute of Technology South Korea Department of Electronic Engineering Hanyang University South Korea Intelligent System Control Research Center Korea Institute of Science and Technology South Korea

In this paper, we propose a new approach to the high-speed wall following of wheeled mobile robots using hybrid control system. The proposed hybrid system consists of the discrete state system as the high-level process and the continuous state system as the low-level process. In discrete state system, the discrete states are defined by the user-defined constraints and the reference motion commands are specified in the abstracted motions. The reference motion commands are translated into the control inputs for each wheel in the continuous state system. The hybrid control system applied for wheeled mobile robots can combine the motion planning and autonomous navigation with obstacle avoidance in indoor navigation problem. Simulation results show that hybrid system approach is an effective method for the autonomous navigation. In the experiments of the indoor environments, we proved that the performance of the high-speed navigation is excellent.

关键词： Mobile robots control systems Motion control Wheels Motion planning Navigation Discrete event systems Robot control Indoor environments Collision avoidance

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Development of SF/sub 6/ gas insulated electromagnetic shield type neutral grounding reactor

Development of SF/sub 6/ gas insulated electromagnetic shiel...

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International Conference on Electrical Machines and systems (ICEMS)

作者： S. Nogawa M. Kuwata N. Takahashi K. Fujiwara Planning Department Nissin Electric Company Limited Kyoto Japan Power Efficiency & Quality Control System Department Nissin Electric Company Limited Kyoto Japan Department of Electrical and Electronic Engineering Okayama University Okayama Japan

A new reactor of SF/sub 6/ gas-insulated electromagnetic shield type for neutral grounding has been developed. This development succeeded in integrating the two functions of reactance and resistance in one reactor. The paper describes the features of the new reactor and reports the results of the magnetic field analysis together with the test results of the reactor.

关键词： Gas insulation Electromagnetic shielding Grounding Inductors Resistors Coils Protective relaying Attenuation Magnetic analysis Eddy currents

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Pole assignment for stochastic systems with unknown coefficients

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Science China(Technological Sciences) 2000年第3期43卷 313-323页

作者：陈翰馥曹希仁 Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and System Science Chinese Academy of Sciences Beijing 100080 China Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Hong Kong

This paper solves the exact pole assignment problem for the single-input stochastic systems with unknown coefficients under the controllability assumption which is necessary and sufficient for the arbitrary pole assignment for systems with known coefficients. The system noise is required to be mutually independent with zero mean and bounded second moment. Two approaches to solving the problem are proposed: One is the iterative learning approach which can be applied when the state at a fixed time can be repeatedly observed with different feedback gains; the other is the adaptive control approach which works when the trajectories satisfy a nondegeneracy condition. Both methods are essentially based on stochastic approximation, and the feedback gains are recursively given without invoking the certainty-equivalency-principle.

关键词： stochastic system leading control pole assignment adaptive control.

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Class d LC/sub s/C/sub p/ series-parallel resonant inverter with inherent maximum output power suitable for driving HPS lamps

Class d LC/sub s/C/sub p/ series-parallel resonant inverter ...

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IEEE International Symposium on Industrial electronics (ISIE)

作者： C. Branas F.J. Azcondo S. Bracho Department of Electronic Technology System Engineering and Automation University of Cantabria Santander Spain

ISBN: (纸本)0780366069

This paper proposes a design method for a class D series-parallel (LC/sub s/C/sub p/) resonant inverter suitable to drive high-intensity discharge lamps. The high voltage needed to achieve the ignition of the lamp is reached by using the gain voltage of the resonant LC/sub s/C/sub p/ network with no auxiliary circuits for this purpose. By means of a soft start-up sequence the maximum voltage and current stress are maintained below prefixed values. In steady state, the operation point is calculated to limit the maximum power that the inverter delivers to the lamp. In this way, the variation of the lamp power caused by the lamp aging is limited in order to fulfil the standard. This design results in cost-effective circuits, simplifying the DC/AC power stage of an electronic ballast. The experimental results are given for two similar 100 W high-pressure sodium lamps with different aging.

关键词： High intensity discharge lamps Voltage Resonant inverters Aging Design methodology Drives Ignition Resonance RLC circuits Stress

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