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유전알고리즘을 이용한 전력계통 안정화 장치의 강인한 $H_\infty$최적 튜닝
정형환,이준탁,이정필,한길만,Jeong, Hyeong-Hwan,Lee, Jun-Tak,Lee, Jeong-Pil,Han, Gil-Man 대한전기학회 2000 전기학회논문지A Vol.49 No.3
In this paper, a robust H$\infty$ optimal tuning problem of a structure-specified PSS is investigated for power systems with parameter variation and disturbance uncertainties. Genetic algorithm is employed for optimization method of PSS parameters. The objective function of the optimization problem is the H$\infty$-norm of a closed loop system. The constraint of the optimization problem are based on the stability of the controller, limits on the values of the parameters and the desired damping of the dominant oscillation mode. It is shown that the proposed H$\infty$ PSS tuned using genetic algorithm is more robust than conventional PSS.
정형환,주수원,이광우,Jeong, Hyeong-Hwan,Ju, Su-Won,Lee, Gwang-U 대한의용생체공학회 1993 의공학회지 Vol.14 No.4
Of the assumptions commonly used in continuous infection model, the least likely to be even approximately true in large population, is that of homogeneous mixing. In this paper, We investigate a model for the spread of infection amongst a population which is divided into classes, such that the individuals of each class mix homogeneously amongst themselves, but mix to a lesser degree with individuals of other class. The stochastic model in this form is intractable and approximations are made, yielding results in reasonable agreement with simulation trials.
Pontryagin 최소 원리를 이용한 최적접종에 관한 연구
정형환,주수원,이광우,Jeong, Hyeong-Hwan,Ju, Su-Won,Lee, Gwang-U 대한의용생체공학회 1988 의공학회지 Vol.9 No.1
The optimum control theory has been applied to the problem of finding the most economic use of active and passive immunization controls. Application of Pontryagin's Minimum Principle to this case, involving functions of delayed control has been demonstrated and a procedure has been developed for the numerical solution of the resulting control problem. Using the numerical procedure, optimum control strategies have been obtained for different values of reported case cost.