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Guidance, Navigation, and control Conference, 1997

作者： Kim, Byung Soo Lee, Jang Gyu Han, Hyung Seok Park, Chan Gook Automatic Control Research Center and School of Electrical Engineering Seoul National University Seoul151-742 Korea Republic of Dept. of Electrical and Electronic Engineering Soonchunhyang University Asan336-745 Korea Republic of Dept. of Control and Instrumentation Engineering Kwangwoon University Seoul139-701 Korea Republic of

The guidance problem with terminal angular constraint is addressed. The guidance goal in the problem is to null miss distance and to achieve a desired impact attitude angle, simultaneously. In order to fulfill the guidance goal, a new homing guidance law, a modified proportional navigation, is proposed. Its performance is analyzed by employing a Lyapunov-like function with the sliding mode control methodology. The efficiency of the proposed guidance law is shown by proving the optimality in the sense that it minimizes the integral of the square of the pursuer acceleration. To account for randomly maneuvering targets, the modified PN with target maneuver compensation is also proposed. Its performance is analyzed by a similar approach. We show that the guidance command is bounded if the target executes a constant acceleration. © 1997 by Jang Gyu Lee.

关键词： Sliding mode control

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A color normalization algorithm for image indexing 3rd

A color normalization algorithm for image indexing

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3rd Asian Conference on Computer Vision, ACCV 1998

作者： Park, In Kyu Yun, Il Dong Lee, Sang Uk Real Time Vision Laboratory School of Electrical Engineering Seoul National University Seoul151-742 Korea Republic of Dept. Of Control and Instrumentation Engineering Hankuk University of F. S. Yongin449-791 Korea Republic of

ISBN: (纸本)3540639306

In this paper, a color normalization algorithm is proposed to compensate the difference of illumination between two images, which could be used for pre-processing, i.e., color constancy step in a histogram-based indexing algorithm. Unlike traditional color constancy algorithms, we attempt to transform the query image, so that the lighting condition is adjusted to be same with the reference image. The proposed algorithm assumes the Maloney and Wandel's reflectance model [6], and normalizes the magnitude of color components of input image. Experiments are carried out to evaluate the proposed algorithm. In the experiments, it is shown that the transformed lighting condition is almost same as the reference image in the color histogram domain. In addition, it is also shown that the performance of Swain's color indexing can be enhanced by combining the proposed algorithm. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Lighting

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Fault-Tolerant Model Based Predictive control with Application to Boiler Systems

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IFAC Proceedings Volumes 1997年第18期30卷 1231-1236页

作者： Won-Kee Son Oh-Kyu Kwon M.E. Lee Laboratory for Control and Instrumentation Systems School of Electrical and Computer Engineering Inha University Inchon 402-751 Koreo Tel: +82-32-860-7395 Fax: +82-32-863-5822 Dept. of Information and Communication Engineering Koreo Institute of Technology and Education Chonan Chungnam 333-860 Korea

This paper deals with the fault-tolerant control problem under nonlinear boiler systems with noise and disturbance. MCMBPC (Multivariable Constrained Model-Based Predictive controller) proposed by Wilkinson et al . is used and modified in this paper in order to be applied to nonlinear boiler systems. Fault-tolerant control scheme combining MCMBPC with a fault detection method based on the unknown input observer is proposed. The fault-tolerant controller proposed is shown, via simulation, to have acceptable tracking performance even under some faults of input valves in the boiler system.

关键词： Fault-tolerant fault detection model-based predictive control boiler systems

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Model and stability of hybrid linear system 5th

Model and stability of hybrid linear system

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5th DIMACS/SYCON Workshop on Verification and control of Hybrid Systems, 1995

作者： Parkt, Hong Seong Kim, Young Sin Kwon, Wook Hyun Lee, Sang Jeong Dept. of Control and Instrumentation Engr Kangwon National University Kangwon-do200-701 Korea Republic of Dept. of Control and Instrumentation Engr Seoul National University Seoul151-741 Korea Republic of Dept. of Electronics Engineering Chungnam National University Daejeon305-764 Korea Republic of

ISBN: (纸本)354061155X

This paper presents a hybrid model suitable for analysis of hybrid systems and for synthesis of hybrid controllers, and the linear hybrid system which combines continuous linear dynamics in each discrete state with discrete dynamics having the Markov property. The stochastic stability of the linear hybrid system is defined and the stability condition and the stabilizability condition is proposed. A simple example is given to illustrate the proposed framework. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Linear systems

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Robust H ∞ Fir Filter for Uncertain Systems

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IFAC Proceedings Volumes 1996年第1期29卷 3386-3391页

作者： Oh-Kyu Kwon Hee-Seob Ryu Kyung-Sang Yoo Laboratory for Control and Instrumentation Systems Dept. of Electrical Engineering Inha University Inchon 402-751 Korea Tel +82-32-860-7395 Fax +82-32-863-5822 Dept. of Electrical Engineering Doowon Technical College Ansung 456-896 Korea

This paper deals with the issue of the robust H ∞ FIR (Fmite Impulse Response) filtering problem for linear systems with parameter uncertainty in the state-space model. Firstly, the H ∞ FIR filter is presented for the system without the uncertainty, which corresponds to the H ∞ filter proposed by Nagpal and Khargonekar (1991). The impulse response of the H ∞ FIR filter is calculated by the equivalence relationship between the FIR filter and the recursive filter (Kwon et al., 1990; 1994). Secondly, the robust H ∞ FIR is proposed for the linear uncertain system with the parameter uncertainty. It is also derived from the relationship between the robust Hqq FIR filter and the robust Hoo filter proposed by Xie and de Souza (1991) and Fu et al. (1992). Estimation performances of the H ∞ FIR filters proposed are compared with two other techniques by Kalman filter and the robust H ∞ filter (Shaked and Theodor, 1992; Fu et at., 1992) via some simulations to exemplify the superiority of the proposed method over other techniques.

关键词： H ∞ estimation robust estimation FIR filter uncertain linear systems

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Analysis and application of nonleaky uniplanar structures with conductor backing

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International Journal of RF and Microwave Computer-Aided engineering 1996年第5期6卷 319-327页

作者： Lee, Chung-Yi Liu, Yaozhong Cha, Kimin Itoh, Tatsuo Electrical Engineering Department Univ. of California Los Angeles Los Angeles CA 90095 United States Hughes Space and Commun. Company Los Angeles CA 90009 United States Chung Yuan Christian University Chungli Taiwan National Chiao Tung University Hsinchu Taiwan University of California Los Angeles CA United States Chinese Jr. Coll. of Mar. Technology Taipei Taiwan Department of Electrical Engineering University of California Los Angeles CA United States Qualcomm Inc. San Diego CA United States Tsinghua University Beijing China UCLA Physics Department Tsinghua University Hughes Space and Commun. Company Dept. of Control and Instrumentation Seoul National University Electrical Engineering Department UCLA Stellarator Laboratory University of Wisconsin Madison WI United States TRW Company

Novel conductor-backed uniplanar structures, including the nonleaky CPW and slotlinc, are analyzed and applied to the active antenna design. Both the spectral domain analysis and finite-difference time-domain techniques are used to simulate these circuits and to justify the numerical results. The measured gain of the novel active antenna is 1.7 dB higher than the conventional CPW antenna due to the unidirectional radiation of conductor-backed circuits. © 1996 John Wiley & Sons, Inc.

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Iterative learning control for a general class of nonlinear feedback systems

Iterative learning control for a general class of nonlinear ...

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American control Conference (ACC)

作者： Chong-Ho Choi Tae-Jeong Jang Dept. of Control & Instrum. Eng. Seoul Nat. Univ. South Korea Department of Control and Instrumentation Engineering Kangwon University South Korea

ISBN: (纸本)0780324455

An iterative learning control is studied for a general class of nonlinear systems with a feedback controller and an input saturator. The nonlinear systems of the form x/spl dot/=f(x,u), y=h(x,u) are considered. The learning law updates the feedforward input from the plant input of the previous trial. A sufficient condition which guarantees the convergence of the learning is given.

关键词： Nonlinear control systems control systems Nonlinear systems Adaptive control Convergence Instruments Sufficient conditions Open loop systems Feedback control Linear feedback control systems

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Analysis of the IEEE 802.4 Token Passing Bus Network with Finite Buffers and Single Priority

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IFAC Proceedings Volumes 1995年第22期28卷 129-134页

作者： Jung Woo Park Deok-Woo Kim Wook Hyun Kwon Dept. of Control and Instrumentation Engineering Seoul National University Seoul 151-742 KOREA Tel: +82-2-873-2279 Fax : +82-2-885-6620 Woorigisool Inc. Yoopoong Bldg. 1595-1 Bongchun-dong Kwanak-gu Seoul 151-057 KOREA

In this paper, the IEEE 802.4 token passing bus network is analyzed. It is assumed that all nodes have finite buffers, finite THT (Token Holding Time) and asymmetric loads. The priority mechanism is not considered. This paper derives the approximate matrix equation between the queue length distribution and the token rotation time in equilibrium state. Based on the matrix equation, the mean waiting time and the blocking probability are derived analytically. The analytic results are compared with simulation results in order to show that the deviations are small.

关键词： IEEE 802.4 Token passing bus Performance analysis

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A learning approach to high precision speed control of servo motors

A learning approach to high precision speed control of servo...

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IEEE International Symposium on Intelligent control (ISIC)

作者： Seok-Hee Han Young-Hoon Kim In-Joong Ha Sun-Tae Lee Jong-Jin Park Dept. of Control & Instrum. Eng. Seoul Nat. Univ. South Korea Department of Control and Instrumentation Engineering Seoul National University Seoul Gyeonggi South Korea Video Laboratory R D Center Technology and Coordination Samsung Electronics Company Limited Suwon Gyeonggi South Korea

ISBN: (纸本)0780327225

Presents a computationally simple learning control method which is ideally tailored to high precision speed control of servo motors in the presence of the mechanical disturbance which is unknown, unstructured, and state-dependent. The authors' learning control algorithm can drive the steady state speed error to zero and, furthermore, can be used to identify the mechanical disturbance in look-up table form. In order to demonstrate the generality and practical use of their work, the authors present the convergence analysis of their learning control algorithm and some experimental results using a single degree-of-freedom manipulator.

关键词： Velocity control Servomechanisms Servomotors Drives Steady-state Error correction Table lookup Convergence Algorithm design and analysis Manipulators

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Feedback control synthesis for a class of controlled Petri nets with time constraints 4

Feedback control synthesis for a class of controlled Petri n...

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4th International Conference on Computer Integrated Manufacturing and Automation Technology, CIMAT 1994

作者： Park, Hyeok Gi Park, Hong Seong Kwon, Wook Hyun Engineering Research Center for Advanced Control and Instr. Seoul National Univ. San 56-1 Silim-dong Kwanak-gu Seoul151-742 Korea Republic of Dept. of Control and Instrumentation Engineering Kangwon National Univ. 192-1 Hyoza 2-dong Chuncheon Kangwon-do200-721 Korea Republic of

ISBN: (纸本)0818665106

This paper presents a cyclic timed controlled marked graph (TCMG) as a model of discrete event system (DES), which is a special class of timed controlled Petri net (TCPN). In TCMG, the remarking time for place isrepresented in terms of the lime delays attached to the places. The possible marking times for place are calculated under the various controls. A maximally permissive slate feedback control is characterized in TCMC: which has more enlarged admissz-ble marking sets than a cyclic controlled marked graph (CMG). © 1994 IEEE.

关键词： Feedback control

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