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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3347卷 346-352页

作者： Boora, Niranjan K. Bhattacharyya, Chiranjib Gopinath, K. Dept. of Electrical Engineering Bangalore India Dept. of Computer Science and Automation Indian Institute of Science Bangalore India

Detecting user to root attacks is an important intrusion detection task. This paper uses a mix of spectrum kernels and probabilistic suffix trees as a possible solution for detecting such intrusions efficiently. Experimental results on two real world datasets show that the proposed approach outperforms the state of the art Fisher kernel based methods in terms of speed with no loss of accuracy. © Springer-Verlag 2004.

关键词： Intrusion detection

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Optimal gait control for a biped locomotion using genetic algorithm

Optimal gait control for a biped locomotion using genetic al...

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International Conference on Computational Science and its Applications, ICCSA 2004

作者： Kim, Jin Geol Choi, Sang Ho Park, Ki Heon School of Electrical Engineering Inha University Inchon Korea Republic of Dept. of Automation Eng Inha University Inchon Korea Republic of School of Electrical and Computer Engineering Sungkyunkwan University Suwon Korea Republic of

ISBN: (纸本)3540220607

This paper is concerned with the generation of a balancing trajectory for improving the walking performance. Balancing motion has been determined by solving the second-order differential equation. However, this method caused some difficulties in linearizing and approximating the equation and had some restrictions on using various balancing trajectories. The proposed method in this paper is based on the GA (genetic algorithm) for minimizing the motions of balancing joints, whose trajectories are generated by the fifth-order polynomial interpolation after planning leg trajectories. Real walking experiments are made on the biped robot IWR-III, which was developed by Intelligent Robot Control Lab., Inha University. The system has eight degrees of freedom: three pitch joints in each leg and two joints (one roll and one prismatic joint) in the balancing mechanism. Experimental result shows the validity and the applicability of the newly proposed algorithm. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Trajectories

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Nonlinear system identification and control design using adaptive wavelet network 6

Nonlinear system identification and control design using ada...

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6th IFAC Symposium on Nonlinear Control Systems, NOLCOS 2004

作者： Karimi, H.R. Lohmann, B. Moshiri, B. Jabchdar Maralani, P. Control and Intelligent Processing Center of Excellence Dept. of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Institute of Automation University of Bremen Otto-Hahn-Allee NW1 BremenD-28359 Germany

This paper presents an application of wavelet networks in identification and control design tor a class of non-linear dynamical systems. The technique of feedback linearization, supervisory control and H∞ control are used to design an adaptive control law and also the parameters of the wavelet networks arc adapted using a Lyapunov-based design. By some theorems, it will be proved that even in the presence of modelling errors, named network error, the stability of the overall identification scheme and the convergence of the network parameters and the boundedness of the state errors are guaranteed. Copyright © 2004 IFAC.

关键词： Feedback linearization

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A neural network based approach to adaptive fault tolerant flight control

A neural network based approach to adaptive fault tolerant f...

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Proceedings of the 2004 IEEE International Symposium on Intelligent Control - 2004 ISIC

作者： Polycarpou, Marios Zhang, Xiaodong Xu, Roger Yang, Yanli Kwan, Chiman Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221 United States Dept. ECE University of Cyprus Rockville MD 20855 United States Intelligent Automation Inc. Rockville MD 20855 United States

This paper presents a neural network based approach to fault tolerant control of nonlinear flight control systems. The proposed scheme consists of three main components. First, a fault diagnosis scheme is designed to detect and identify automatically the occurrence of any faults. Second, a controller suite comprises a nominal controller and a neural network based adaptive fault tolerant controller designed to compensate for the effects of faults. Third, a reconfiguration supervisor makes decisions regarding controller reconfiguration. A simulation study using a nonlinear "Beaver" flight simulator illustrates the effectiveness of the proposed scheme and shows that flight safety is significantly improved by using the controller reconfiguration. © 2004 IEEE.

关键词： Flight dynamics

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Discrete time mapping modeling and bifurcation phenomenon study of a ZVS converter

Discrete time mapping modeling and bifurcation phenomenon st...

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2004 International Conference on Power System Technology, POWERCON 2004

作者： Sun, Yue Hu, Aiguo Patrick Dai, Xin Su, Yugang Automation College ChongQing University ChongQing China Education Ministry Key Lab of Optic-Electronic Technology and System ChongQing University ChongQing China Electrical and Computer Engineering Dept. University of Auckland New Zealand

ISBN: (纸本)0780386108

The varying period and complex commutation conditions make the classic mapping modeling method based on fixed switching period no longer fit for soft switching circuit analysis. This paper proposes a discrete time mapping method for modeling variable frequency resonant circuits. The analysis begins with the derivation of a sixth-order iterative map for a ZVS converter used in ICPT (Inductively Coupled Power Transfer) systems and then the model developed is employed to analyze the instability and sub-harmonic operation of the converter. © 2004 IEEE.

关键词： Electric converters

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Fuzzy automata for fault diagnosis: A syntactic analysis approach

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3rd Hellenic Conference on Artificial Intelligence, SETN 2004

作者： Rigatos, Gerasimos G. Tzafestas, Spyros G Industrial Systems Institute University Campus of Patras Building A ’ Rion Patras26500 Greece National Technical University of Athens Dept. of Electrical and Computer Engineering Intelligent Robotics and Automation Lab Zografou Campus Athens15773 Greece

ISBN: (纸本)3540219374

Fuzzy automata are proposed for fault diagnosis. The output of the monitored system is partitioned into linear segments which are assigned to pattern classes (templates) with the use of fuzzy membership functions. A sequence of templates is generated and becomes input to fuzzy automata which have transitions that correspond to the templates of the properly functioning system. If the automata reach their final states, i.e. the input sequence is accepted by the automata with a membership degree that exceeds a certain threshold, then normal operation is deduced, otherwise, a failure is diagnosed. Fault diagnosis of a DC motor and detection of abnormalities in the ECG signal are used as case studies. © Springer-Verlag Berlin Heidelberg 2004.

关键词： DC motors

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Hamilton-Jacobi-Isaacs Formulation for Constrained Input Systems: Neural Network Solution *

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IFAC Proceedings Volumes 2004年第21期37卷 1-6页

作者： Frank L. Lewis Murad Abu-Khalaf Jie Huang Automation and Robotics Research Institute University of Texas at Arlington Texas 76118 USA Dept. of Automation and Computer-Aided Engineering The Chinese University of Hong Kong Shatin N.T. Hong Kong

In this paper we consider the H ∞ nonlinear state feedback control for constrained input systems. The constraints on the input to the system are encoded via a quasi-norm that will enable us to perform a quasi- L 2 gain analysis of the corresponding closed-loop nonlinear system. The quasi-norm allows using nonquadratic supply rates along with dissipativity theory to formulate the robust optimal control problem using Hamilton-Jacobi-Isaacs (HJI) equations. An iterative computationally efficient solution technique based on the game theoretic interpretation of the HJI equation is presented. The relation between attenuation gain and the region of asymptotic stability of the H ∞ controller is discussed from the game theoretic perspective. The solution is approximated at each iteration with a neural network over a predefined domain of the region of asymptotic stability of an initially stabilizing controller. The result is a closed-loop control based on a neural net that has been tuned a priori off-line.

关键词： Actuator saturation Hamilton-Jacobi-Isaacs Optimal Control Robust Control Neural network approximation

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Haptic sensing and modeling of nanomanipulation with an AFM

Haptic sensing and modeling of nanomanipulation with an AFM

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Proceedings - 2004 IEEE International Conference on Robotics and Biomimetics, IEEE ROBIO 2004

作者： Fok, L.M. Liu, Y.H. Li, Wen J. Robot Control Laboratory Chinese University of Hong Kong Hong Kong Hong Kong Centre for Micro and Nano Systems Chinese University of Hong Kong Hong Kong Hong Kong Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong

ISBN: (纸本)0780386418

This paper describes a virtual reality and haptic interface between human and the Atomic Force Microscope (AFM), which allows the operator to sense and touch the surface and nanoparticles during the manipulation with an AFM tip. The tip-sample interaction forces and intermolecular forces between the tip and surface are modeled based on Lennard-Jones potential and JKR theory, respectively. Our objective is to provide a 3D virtual reality interface capable of displaying topography of surface for the users and allow them to predict the results for the manipulation. © 2004 IEEE.

关键词： Nanotechnology

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New trend in control of steady-state large-scale systems 10

New trend in control of steady-state large-scale systems

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10th IFAC/IFORS/IMACS/IFIP Symposium on Large Scale Systems: Theory and Applications, LSS 2004

作者： Wan, Bai-Wu Liu, Ding Ruan, Xiaoe Institute of Systems Engineering State Key Laboratory for Manufacturing Systems Engineering Xi'anJiaotong University China School of Automation Xi 'an University of Technology China Dept. of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-7 Guseong-dong Yuseong-gu Daejeon305-701 Korea Republic of Faculty of Science Xi 'anJiaotong University China

This paper reviews what the first Author and his Group have been investigating for the past decade in the on-line steady-state hierarchical intelligent control and optimization of large-scale industrial processes (LSIP), as well as large-scale systems (LSS). The techniques include the use of neural networks for identification and optimization, the use of expert systems to solve some kinds of hierarchical multi-objective optimization problems, the use of the fuzzy logic control and the use of the iterative learning control. In addition, several implementation examples and the product quality control for LSS are introduced. Finally the paper prospects the new stages of development. © 2004 IFAC.

关键词： Quality control

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Single-dimension software pipelining for multi-dimensional loops

Single-dimension software pipelining for multi-dimensional l...

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International Symposium on Code Generation and Optimization, CGO 2004

作者： Rong, Hongbo Tang, Zhizhong Govindarajan, R. Douillet, Alban Gao, Guang R. Department of Electrical Engineering University of Delaware Newark DE 19716 United States Dept. of Comp. Sci. and Technology Tsinghua University Beijing 100084 China Supercomputer Edn. and Res. Centre Computer Science and Automation Indian Institute of Science Bangalore 560 012 India

ISBN: (纸本)0769521029

Traditionally, software pipelining is applied either to the innermost loop of a given loop nest or from the innermost loop to outer loops. In this paper, we propose a threestep approach, called Single-dimension Software Pipelining (SSP), to software pipeline a loop nest at an arbitrary loop level. The first step identifies the most profitable loop level for software pipelining in terms of initiation rate or data reuse potential. The second step simplifies the multi-dimensional data-dependence graph (DDG) into a 1-dimensional DDG and constructs a 1-dimensional schedule for the selected loop level. The third step derives a simple mapping function which specifies the schedule time for the operations of the multi-dimensional loop, based on the 1-dimensional schedule. We prove that the SSP method is correct and at least as efficient as other modulo scheduling methods. We establish the feasibility and correctness of our approach by implementing it on the IA-64 architecture. Experimental results on a small number of loops show significant performance improvements over existing modulo scheduling methods that software pipeline a loop nest from the innermost loop.

关键词： Pipeline processing systems

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