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김민환 호남대학교 1997 호남대학교 학술논문집 Vol.18 No.4
The major aim of this study is to evaluate the water balance at ungaged point(Yongam). It is not certain whether the source of water at Yongam is the natural flow or the storage water from reservoirs. The water balance need to preventive from the dispute of the water distribution at Yongam. In this river system, it was estimated that the drought event had 11 years and the natural flow was produced by using tank model. According to the results of the water balabce analysis, in the drought year, it appears that (1)the period of the water incapable pumping is during 0.6-5 months. (2) the period of the water of part pumping is during 3.5-6.6 months. (3) the period of the water of pumping over the capable of facilities is during 3.6-4.8 months.
貯水池群의 最適運營을 위한 微分動的 計劃法의 效率性 向上
金珉煥 호남대학교 1989 호남대학교 학술논문집 Vol.10 No.-
The solution of Differential Dynamic Programming (DDP), that are based on embeding the numerical model as constraints in a mathematical problem, is very difficult due to the large dimensions of the programming problem. This paper presents modified mathematical model of DDP using Newton-Raphson method. The modified mathematical model construct a simple form compare to other model. And the inverse matrix of Jacobian calculate by partitioning to reduce error. This paper has shown that modified mathematical model is an efficient solution method for the optimal control of multireservoirs operation.
김민환 한국지하수토양환경학회 1997 지하수환경 Vol.4 No.3
지하수를 효율적으로 이용하고 보존하기 위해서는 우선 대수층의 투수량계수와 저류계수를 가능한 정확히 평가하여야 한다. 대수층의 수리상수를 결정하기 위한 여러 가지 방법이 본 논문에 소개되었다. 각 방법의 특성을 기술하였으며 각 방법에 의해서 얻어진 결과를 비교하였다. 이를 토대로 자동적으로 대수층의 수리상수를 평가할 수 있는 개선된 방법을 모색하였다. In order to use and conserve groundwater efficiently, in the first place the values of transmissivity and storage coefficient have to be correctly estimated. Various methods to determine hydraulic parameters of aquifer were reviewed and the characteristics of the methods were described in this paper. They were compared to obtaine parameters by various methods. An improved method to estimate the hydraulic parameters of aquifer is suggested by the comparison of the previous methods.
체육 중등 교사의 교수 행동에 대한 지속적인 개선 훈련의 효과
김민환,김재중 청주대학교 교육문제연구소 1999 교육과학연구 Vol.13 No.-
The aim of this study is to improve a teacher's teaching behavior in the conrse of a physical middle school teacher's teaching and to find the improving effects of a teaching behavior by providing the different level teachers of teaching for a proviso. The result of this study is as follows. Firstly, the concern that provides the teaching proviso has the improving effects of a physical teacher's teaching. Secondarily, the comparison with concerning effects by providing the different level teacheers of teaching for a proviso is as follows. 1) The concerning effects show without the career of the teachers in the feedback of behavior. 2) A experienced teachers has more the concerning effects then a novice teacher in the affirmative feedback. 3) A novice teacher has more the concerning effects then a experienced teacher in the negative feedback.