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정형환,주수원,김해재,Chong, Hyeng-Hwan,Joo, Soo-Won,Kim, Hae-Jae 대한의용생체공학회 1988 의공학회지 Vol.9 No.2
This thesis investigates the Quantitative aspect of epidemic phenomena utilizing the analytical method of discrete time systeMs based on the theory of Markov processes. In particular, the pattern on the epidemic character of turberculosis controlled by prophylaxis and BCG vaccinatioll was analyzed by the markovian model of tuberculosis system which is derived according to the ecologic relationship between nine epidemiologic states of individuals. The quantitative aspects of the model were characterized by digital computer simulations.
정형환,주석민,이광민 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
This paper proposed a regulation technique of scale factors on fuzzy controller for power system stabilization. These scale factors are regulated by a given exponential function with performance index variables. Simulation results showed that the proposrd fuzzy control technique was more powerful than conventional ones in faces of usefulness and robustness.
交流一直流 電力系統의 효과적인 潮流計算을 위한 새로운 方法
정동일,이광우,정형환 東亞大學校 海洋資源硏究所 1993 硏究論文集 Vol.6 No.1
The new method results from a further simplipication of the unified methods. The a. c. systme equations are solved with the d. c. system modelled simple as a real and reactive power injection at the appropriate ferm busbar. For d. c. solution the a. c. system is modelled simply as a constant voltage at the Converter a. c. terminal busbar.
안병철,왕용필,정형환 東亞大學校 1994 東亞論叢 Vol.31 No.1
This paper proposed the optami PID type controllers of excitation and speed governor control systems for stability improvement of synchronous generator against a disturbance. The PID's coefficients are designed according to optimization teachque using the simplex method. Also, tlie sensitivity uf the optimal parameters to robustness analysis considered.