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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.
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金玟煥 尙志大學校 1996 論文集 Vol.17 No.-
The purpose of this study is to examine the logic of curriculum theorists in the 1920s. This period was known as formative years of the curriculum field. Major theorists were F. Bobbitt, F.G. Bonser, W.W. Charters, G.S. Counts, W.C. Bagley, H. Rugg, D. Snedden, H.L. Caswell & D.S. Campbell, and J. Dewey etc.. Firstly, we reviewed the work of five curriculum theorists, who leaded the how to curriculum making. Bobbitt, who was shown as a father of the curriculum theorist, leaded the social efficiency movement in curriculum. He advocated that the curriculum should be formulated by scientifically analyzing activities of adult life and translating them into behavioral objectives. The process was known as activity analysis. It was detalied in his work, How to Make a Curriculum(1924). Bonser's primary concern was curriculum making for the elementary education. He conceived curriculum as something which can be stated, and as being the same for all children in elementary school. Thus, he suggested that the process of planning a curriculum with regard to using the principles of job analysis whcih was determine common knowledge, skills, attitudes, and appreciations to all works of life in America. Charters, like Bonser, focused on the tasks involved in planning a curriculum. He viewed the curriculum as a series of objectives that children must attain by way of a series of learning experiences. In his book on Curriculum Construction(1923), he maintained that there are seven rules for constructing a curriculum and that these rules may be ordered so as to define the logical sequence of steps to be taken in planning a curriculum. According to his suggestion, subject matter must be logically derived from objectives. He has emphasized that the first step was to identify ideals of socially efficient persons in the society. These ideals and common activities were then analyzed into objectives and were arranged in order of importance for children to acquire, so that they might efficiently fit society's needs. The process was known as job analysis. Counts explained the curriculum with relation to the social function of education. He viewed the curriculum as a statement of what ought be the stage of development of human experiences. In other words, a curiculum is a statement of what ought be the case for the child and for society. Especially, he criticized the method of scientific curriculum making and insisted that a children's interests furnish the raw conditions but not the goals of education. Begley emphasized the form of the curriculum as do Bonser and Charters. Also, like them, he viewed the curriculum as a statement which is to direct the work of teachers. He look to subject matter as constituting the curriculum. He suggested the core curriculum that will be the nucleus of a common culture for the children of the nation. Five curriculum theorists' concern was the method of curriculum making. But their viewpoint of the curriuclum and approach to constituting the curriculum were different each other. Thus, in order to understand their logic of curriculum manking in detail, we should compare the issues and debates of each curriuclum theorist and scrutinize the suggestions of the five in reference to their social circumstance.
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개선된 SM(Slope-Matching) 방법에 의한 대수층의 특성변수 결정
김민환,오종민,전일권 한국지하수토양환경학회 2001 지하수토양환경 Vol.6 No.4
산업과 생활수준의 발달로 지하수 사용량은 증가되어 가고 있다. 지하수 해석을 위해서 대수층의 특성변수의 결정은 매우 중요하다. 대수층의 해석과 고전적인 도식적 방법의 주관성을 제거하기 위해 여러 가지 수치방법이 개발되어 왔다. Theis의 관계곡선과 현장 자료를 토대로 유도된 SM방법이 누수대수층과 비누수대수층에 대한 해석을 위해 사용되어 왔다. 본 논문에서는 SM방법을 토대로 전달계수, 저류계수, 누수계수를 결정하기 위한 자동화된 포트란 프로그램을 개발하여 제시하였다. 기존의 양수시험 자료를 토대로 개선된 SM방법의 결과는 기존의 SM방법의 결과와 거의 일치하고 있다. With the development of industry and standard of living, the quantity of groundwater consumption has been increasing. For the analysis of groundwater, to determine the hydraulic parameters of aquifer is very important. Various numerical methods have been developed to solve aquifer tests and eliminate the subjectivity of traditional graphical type curve methods. The slope-matching method, which matches the slope of the Theis type curve to the slope of the field data, can be used to numerically solve pump tests for both leaky and nonleaky aquifers. A FORTRAN program on based slope-matching method was developed to obtain the transmissivity, storage coefficient, and leaky factor from pumping test data automatically. Results derived from published data show that the improved slope-matching method gives parameters close to the ones derived by the slope-matching method.
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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.
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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.
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