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확률론적 방법을 이용한 교류 고속철도 시스템의 고조파 해석
송학선(Song Hak-Seon),이준경(Lee Jun-Kyong),김진오(Kim Jin-O),김형철(Kim Hyong-Chul) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Magnitude of generated harmonic currents along with the operation of AC traction has nonlinear characteristics, and generated harmonic currents for high speed traction are more and more in high speed railroad(HSR) systems, especially. This paper presents probabilistic approximation method for the harmonic currents analysis about the operating speed of AC traction. To use probabilistic method for HSR system, probability density function(PDF) for collected operating speed based measure data is calculated. Mean and variance of harmonic currents of single traction are obtained based on the operating speed PDF and electrical traction model. The results of Monte Carlo Simulation(MCS) are in well accordance with the experimental and analytic methods. The harmonics of different number of trainloads are systematically investigated. It is assessed by the total demand distortion(TDD) for the HSR system.
신효준(Hyo-Jun Shin),금종수(Jong-Soo Kum),김동규(Dong-Kyu Kim),신병환(Byong-Hwan Shin),김형철(Hyong-Chul Kim),우성제(Seong-Je Woo) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
There are numerous studies on relations between sleep and environmental factors as noise, illumination and thermal conditions. However ambient temperature is a common factor of the environment but some of its effects on human biology are still unknown. This study is a sleep fact-finding survey. Satisfaction in the sleep environment is composed of many components, the most important of them is thermal comfort. Simultaneously, room temperature and humidity were also measured. This Study investigates influence of thermal environment on skin temperature, sleep patterns using psychological measurements and psychological responses and describes about the comfort temperature in order to sleep enough in hot summer night.
김형철,이미식,최용성 부산교육대학교 초등교육연구소 2001 초등교육연구 Vol.16 No.-
There is a common misapprehension that those educating who value rationality as an aim necessarily ignore the aims of educating people in respect of imagination. conversely, conceps such as imgiation, creativity, and morality are logically tied up with rationality. A Curriculum concerned with the development of moral imagination therefore has to involve those subject matters in which we are particularly concerned to see imagination displayed and those that are most likely to foster the imaginative spirit or disposition by opening up the mind to the variety and complexity of human experience. The narrative education for moral imagination to nurture a lively application of possibilities, and the narrative education is to present the possibilities of tradition as ways of enriching people's lives rather than as pre-established rigid patterns imposed upon reluctant individuals. After all, this study is an inquiry into narrtive the primary form by which human moral experience is made meaningful. And the aim of the study of narrative is make explicity the operations that produce its particular meaning, and to draw out the implications this meaning has for moral imagination. So teachers should deal with the domains such moral imagination, creativity as well as the cognitive domains such a moral knowledge and judgment. In order to facilitate students' moral imagination, teachers should use various narrative materials relevant to a particular content and select appropriate narrative teaching methods.