H. Y. Jung

Publications

4 Sampled-Data Control for Fuel Cell Systems

Authors: Ju H. Park, S. M. Lee, H. Y. Jung

Abstract:

Sampled-data controller is presented for solid oxide fuel cell systems which is expressed by a sector bounded nonlinear model. The proposed control law is obtained by solving a convex problem satisfying several linear matrix inequalities. Simulation results are given to show the effectiveness of the proposed design method.

Keywords: sampled-data control, time-delay, Sector bound, Solid oxide fuel cell

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3 Integral Tracking Control for a Piezoelectric Actuator System

Authors: J. H. Park, S. M. Lee, H. Y. Jung, S. C. Jeong, J. H. Koo

Abstract:

We propose an integral tracking control method for a piezoelectric actuator system. The proposed method achieves the output tracking without requiring any hysteresis observer or schemes to compensate the hysteresis effect. With the proposed control law, the system is converted into the standard singularly perturbed model. Using Tikhonov-s theorem, we guarantee that the tracking error can be reduced to arbitrarily small bound. A numerical example is given to illustrate the effectiveness of our proposed method.

Keywords: Piezoelectric Actuator, tracking control, hysteresis effect

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2 H∞ Approach to Functional Projective Synchronization for Chaotic Systems with Disturbances

Authors: J. H. Park, S. M. Lee, H. Y. Jung

Abstract:

This paper presents a method for functional projective H∞ synchronization problem of chaotic systems with external disturbance. Based on Lyapunov theory and linear matrix inequality (LMI) formulation, the novel feedback controller is established to not only guarantee stable synchronization of both drive and response systems but also reduce the effect of external disturbance to an H∞ norm constraint.

Keywords: Chaotic systems, LMI, functional projective H∞ synchronization

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1 Synchronization Between Two Chaotic Systems: Numerical and Circuit Simulation

Authors: J. H. Park, T. H. Lee, S. M. Lee, H. Y. Jung

Abstract:

In this paper, a generalized synchronization scheme, which is called function synchronization, for chaotic systems is studied. Based on Lyapunov method and active control method, we design the synchronization controller for the system such that the error dynamics between master and slave chaotic systems is asymptotically stable. For verification of our theory, computer and circuit simulations for a specific chaotic system is conducted.

Keywords: Simulation, Chaotic systems, Synchronization, Lyapunov method

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Abstracts

2 Sampled-Data Control for Fuel Cell Systems

Authors: Ju H. Park, S. M. Lee, H. Y. Jung

Abstract:

A sampled-data controller is presented for solid oxide fuel cell systems which is expressed by a sector bounded nonlinear model. The sector bounded nonlinear systems, which have a feedback connection with a linear dynamical system and nonlinearity satisfying certain sector type constraints. Also, the sampled-data control scheme is very useful since it is possible to handle digital controller and increasing research efforts have been devoted to sampled-data control systems with the development of modern high-speed computers. The proposed control law is obtained by solving a convex problem satisfying several linear matrix inequalities. Simulation results are given to show the effectiveness of the proposed design method.

Keywords: Nonlinear Control, Fuel Cell, linear matrix inequalities, sampled-data control

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1 Delay-Dependent Passivity Analysis for Neural Networks with Time-Varying Delays

Authors: J. H. Park, H. Y. Jung, Jing Wang, Hao Shen

Abstract:

This brief addresses the passivity problem for neural networks with time-varying delays. The aim is focus on establishing the passivity condition of the considered neural networks.

Keywords: Neural Networks, passivity analysis, time-varying delays, linear matrix inequality

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