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1st IEEE International Conference on Wireless Broadband and Ultra Wideband Communications, AusWireless 2006

作者： Fang, Shudong Sun, Jinsheng Berber, Stevan M. Dept. of Electrical and Computer Engineering Univ. of Auckland New Zealand Dept. of Automatic control Nanjing Univ. of Sci. and Tech. China

ISBN: (纸本)0977520005

An adaptive target queue length (ATQL) adjustment algorithm proposed in this paper cooperates with certain Active Queue Management (AQM) controllers to achieve more efficient buffer management for Internet congestion control. ATQL algorithm which estimates the average traffic load and dynamically adjusts the target queue length in dynamic traffic environment can be easily embedded into a series of AQM controllers. By engaging ATQL, AQM controllers are more suited to random and unpredictable traffic scenarios. Simulations are applied to validate ATQL's ability in assisting AQM controllers in sustaining stable drop probability, minimizing unnecessary packet loss, guaranteeing the link utility and maximizing the exploitation of buffer spaces.

关键词： Queueing theory

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Fault diagnosis for induction machines using kernel principal component analysis

Fault diagnosis for induction machines using kernel principa...

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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Park, Jang-Hwan Lee, Dae-Jong Chun, Myung-Geun Information and Control Engineering Chungju National University Chungju Korea Republic of Dept. of Electrical and Computer Engineering Chungbuk National University Korea Republic of

ISBN: (纸本)3540344829

For the fault diagnosis of three-phase induction motors, we set up an experimental unit and then develop a diagnosis algorithm based on pattern recognition. The experimental unit consists of induction motor drive and data acquisition module to obtain the fault signals. As the first step for diagnosis procedure, preprocessing is performed to make the acquired current simplified and normalized. To simplify the input data, three-phase currents are transformed into the magnitude of Concordia vector. As the next step, feature extraction is performed by kernel PCA. Finally, we used the linear classifier based on two types of distance measures. To show the effectiveness, the proposed fault diagnostic system has been intensively tested with the various data acquired under the different electrical and mechanical faults with varying load. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Induction motors

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BUILDING AUTOMATA – TYPE SIMULATION MODELS FOR UNDERGRADUATE TEACHING INDUSTRIAL SYSTEMS ANALYSIS

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IFAC Proceedings Volumes 2006年第6期39卷 297-302页

作者： Vasileios Deligiannis Stamatis Manesis Patras Electrical & Computer Engineering Dept. Division of Systems and Control

Simulation has a significant role in control engineering. It provides the best solution for educating new engineers without expensive experimentation on real systems. This paper presents a guide for constructing simulation models based on a recently presented hyper-class of hybrid automata. New type's definition is given jointly with some examples of guide's use. Guide is applicable in various programming environments and is oriented for undergraduate teaching purposes.

关键词： automata modelling simulation education industrial production systems

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Trajectory planning of space robot system for target berthing and reorientation after capturing

Trajectory planning of space robot system for target berthin...

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6th World Congress on Intelligent control and Automation, WCICA 2006

作者： Wenfu, Xu Bin, Liang Wenyi, Qiang Panfeng, Huang Yangsheng, Xu Dept. of Control Science and Engineering Harbin Institute of Technology Harbin 150001 China College of Astronautics Northwestern Polytechnical University Xi'An China Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)1424403324

A typical servicing operation in space mainly includes three phases: capturing the target, berthing and docking the target, and repairing the target. The attitude of a satellite usually changes after the capturing, because the control system is turned off during this phase for safety reasons. In this paper, a method is proposed to achieve the berthing of the target and reorientating the satellite attitude at the same time, both by involving manipulator motion only. Firstly, the constraints on the manipulator and the objective function are defined according to the planning problem. Then the joint trajectory is parameterized by sinusoidal function, whose argument is the polynomial. Finally, Genetic Algorithm is used to search for the global optimal resolution of the parameters. When the parameters are found, each joint trajectory can be determined. This planned trajectory is smooth and more applicable for the control of the free-floating robotic system. Our proposed method is verified by simulation. © 2006 IEEE.

关键词： Mobile robots

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Research on adaptive fuzzy PID control for long time delay systems

Research on adaptive fuzzy PID control for long time delay s...

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Sixth International Symposium on Instrumentation and control Technology: Sensors, Automatic Measurement, control, and computer Simulation

作者： Luo, Wenguang Lan, Hongli Chen, Wenhui Dept. of Electronic Information and Control Engineering Guangxi Univ. of Technology 268 Donghuan Road Liuzhou Guangxi 545006 China Dept. of Computer Engineering Guangxi Univ. of Technology 268 Donghuan Road Liuzhou Guangxi 545006 China

ISBN: (纸本)0819464538

An adaptive fuzzy PID controller is proposed to solve the problem that long time delay systems are difficult to be controlled. The controller is obtained by combining the fuzzy controller with PID controller in series, namely the output of the fuzzy controller is as the input of PID, and the control parameters of PID change nonlinearly with the system error's change. Meanwhile, the output scaling gain Ku of the fuzzy controller can be adaptively regulated. Two regulation methods are presented: one is that the linear function between Ku and the system's error is built up based on the system's dynamical characteristics;the other is that Ku is automatically regulated with the fuzzy inference whose two inputs are the comprehensive performance index and its change, the output is the increment of Ku. In the paper, we combine the controlled system with PID controller as an integrated system, and then build up its discrete state space model in the condition that the system's output delays. Based on these, the system's stability is analyzed with Lyapunov Direct Method. Simulation test results show the method provides good control performances to long time delay systems.

关键词： Three term control systems

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Implementation of GA-trained GRNN for Intelligent Fast Charger for Ni-Cd Batteries

Implementation of GA-trained GRNN for Intelligent Fast Charg...

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CES/IEEE 5th International Power Electronics and Motion control Conference

作者： Panom Petchjatuporn Noppadol Khaehintung Khamron Sunat Phaophak Sirisuk Wiwat Kiranon Dept. of Control and Instrumentation Engineering Faculty of Engineering Dept. of Control and Instrumentation Engineering Faculty of Engineering Dept. of Computer Engineering Faculty of Engineering Dept. of Computer Engineering Faculty of Engineering Dept. of Telecommunication Engineering Faculty of Engineering Mahanakorn University of Technology Bangkok THAILAND 10530

This paper presents the development of an intelligent genetic algorithm (GA) technique for training of a generalized regression neural network (GRNN) controller to achieve a compact network and to decrease battery charging time on a cost-effective RISC microcontroller. The suitable input-output data were selected from GA mechanism to establish GRNN. The computational complexity of GRNN can be reduced replaced by some simple polynomial forms. As a consequence, the fast charging device for Nickel-Cadmium (Ni-Cd) batteries can be efficiently implemented on a low-cost 16F876A RISC microcontroller. Experimental results are shown to demonstrate superiority of the proposed system.

关键词： RISC microcontroller genetic algorithm fast charging the generalized regression neural network radial basis functions

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A novel approach to automatic music composing: Using genetic algorithm

A novel approach to automatic music composing: Using genetic...

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International computer Music Conference, ICMC 2006

作者： Zad, Damon Daylamani Araabi, Babak N. Lucas, Caru Department of Information Systems and Computing Brunel University United Kingdom Dept. of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Iran

Artificial music composition is one of the ever rising problems of computer science. Genetic Algorithm has been one of the most useful means in our hands to solve optimization problems. By use of precise assumptions and adequate fitness function it is possible to change the music composing into an optimization problem. This paper proposes a new genetic algorithm for composing music. Considering entropy of the notes distribution as a factor of fitness function and developing mutation and crossover functions based on harmonic rules and trying to keep the melodies intact during these processes would result in a musical piece pleasant to human ears and interesting for human mind. This algorithm does not have the constraints of the previous algorithms. Restraining mutation and crossover functions with a goal of producing melodies based on acceptable melodies composed by humans, this algorithm is not bound to any genre, instrument or melody. The experimental results of this approach show that it is near to the human composing and the results produced from it are more acceptable than the ones produced by its predecessors.

关键词： Genetic algorithms

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A low-power 64-point FFT/IFFT design for IEEE 802.11a WLAN application

A low-power 64-point FFT/IFFT design for IEEE 802.11a WLAN a...

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ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems

作者： Lin, Chin-Teng Yu, An-Chu Van, Lan-Da Dept. of Electrical and Control Engineering National Chiao Tung University Hsinchu 300 Taiwan Department of Computer Science National Chaio Tung University Hsinchu 300 Taiwan

ISBN: (纸本)0780393902

In this paper, we propose a cost-effective and low-power 64-point fast Fourier transform (FFT)/inverse FFT (IFFT) architecture and chip adopting the retrenched 8-point FFT/IFFT (R8-FFT) unit and an efficient data-swapping method based output buffer unit The whole chip systematic performance concerning about the area, power, latency and pending cycles for the application of IEEE 802.11a WLAN standard has been analyzed. The proposed R8-FFT unit utilizing the symmetry property of the matrix decomposition achieves half computation-complexity and less power consumption compared with the recently proposed FFT/IFFT designs. On the other hand, applying the proposed data-swapping method, a low-cost and low-power output buffer can be obtained. So as to further increase system performance, we propose one scheme: the multiplication-afler-write (MAW) method. Applying MA W method with R8-FFT unit, the resulting FFT/IFFT design not only leads to the balancing pending cycle, but also abbreviating computation latency to 8 clock cycles. Consequently, adopting the above proposed two units and one scheme, the whole chip consumes 22.36mW under 1.2V@20 MHz in TSMC 0.13 1P8M CMOS process. © 2006 IEEE.

关键词： Fast Fourier transforms

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Sagnac quantum key distribution using novel polarization-insensitive phase modulators based on frequency shift

Sagnac quantum key distribution using novel polarization-ins...

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2006 LEOS Summer Topical Meetings

作者： Huang, Lei-Lei Qi, Bing Mong, Roger Qian, Li Lo, Hoi-Kwong Dept. of Electrical and Computer Engineering Center for Quantum Information and Quantum Control University of Toronto Toronto M5S 3G4 Canada

We demonstrate a stable Sagnac quantum key distribution implementing BB84 phase-encoding protocol based on acousto-optic frequency shifters. The quantum bit error rate remains 4-6.5% for at least one hour without reca... 详细信息

ISBN: (纸本)1424400902

关键词： Quantum cryptography

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Online computing model of temperature field of turbine rotor

Online computing model of temperature field of turbine rotor

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2006 ASME Power Conference

作者： He, Qing Du, Dongmei Chen, Yuesheng Key Laboratory of Condition Monitoring and Control for Power Plant Equipment Ministry of Education Dept. of Power Engineering Beijing 102206 China Dept. of Computer Science and Technology North China Electric Power University Beijing 102206 China

ISBN: (纸本)0791837769

Computation of temperature field of turbine rotor is a two-dimension axisymmetric problem. A two-dimension computing model of rotor temperature field is obtained by the analysis and simplification of rotor geometry structure and boundary conditions. The finite difference method is used to compute two-dimension temperature field of turbine rotor in this paper, which has enough precision and low amount of computation for online monitoring. By simplifying the structure and boundary conditions of turbine rotor, the fifteen node types of rotor are obtained. The difference calculating formulas for all node types are given. According to the model and difference formulas, an online computing program of temperature field of turbine rotor has been developed and applied to a 200MW turbine. Color cloud picture of temperature field of turbine rotor is released online via Internet. Copyright © 2006 by ASME.

关键词： Rotors

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