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한문섭(M. S. Han),창상훈(S. H. Chang),신명철(M. C. Shin) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
A neutral section is installed around feeding substation(SS) and sectioning post(SP) that M?phase and Tphase are isolated in AC feeding system. Electric Train under “Notch?OFF” is operated by inertia within the neutral section. It causes disturbing the operation of electric trains for speed drop and driver’s mistakes. A automatic changeover system with thyristor recently have taken under development. In the paper, it is introduced the configuration of train detection system and performance testing on automatic changeover system..
영어 청해 장애 요인 분석: 15개 시,도교육청 주관 듣기 평가를 중심으로
한문섭 ( M. S. Han ),이진석 ( J. S. Lee ) 한국중등영어교육학회 2010 중등영어교육 Vol.3 No.1
The purpose of this study is to analyze obstacle factors to English listening comprehension through analyzing items of the English listening comprehension test for highschool students. To make a comparative study of linguistic obstacle factors and the percentage of correct answers, SPSS 12.0 was used for frequency and correlation analysis. The results of this study show that, unexpectedly, linguistic obstacle factors and the percentageof correct answers are not correlative amongst all items, except for vocabulary. In addition, in the comparison of dialogs and monologs, in spite of the fact that WPM of the monologs are slow, monologs have a low percentage of correct answers, because monologs have many content words and have fewer pauses and hesitation than dialogs. Therefore, when listeners understand the information, pauses and hesitation work as positive factors ,and many contents words work as negative factors. The results also show that the clue-position can affect the percentage of correct answers. If clues are located at the end, the percentage of correct answers is higher than when they are located throughout. It may happen because of short-term memory limitation, so sometimes, if a certain word is placed at the end, many students misjudge that word as a right answer clue. The percentage of correct answers 55% and less items, one can see linguistic factors and learners’ factors as strong obstacle factors. Especially, memory limitation and semantic unfamiliarity work as hampering factors in many places. In the error response, many students make mistakes in vocabulary and have weak points in numbers such as time, money, etc. It shows that we should learn vocabulary by heart. And there are differences between freshmen and seniors.
Prediction and Measurement for Harmonics on the Test Track of Seoul-Pusan High-speed Railway
오광해(K.H. Oh),이장무(C.M. Lee),한문섭(M.S. Han),이기원(K.W. Lee),권삼영(K.S. Kwon),창상훈(S.H. Chang),김길상(K.S. Kim) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper proposes a new model for harmonic analysis in 2×25㎸ traction power supply system including inverted feeder, contact line, rails and auto-transformer. The system model is based on four-port representation which is an extension of two-port network theory. In order to verify the proposed approach, we have analysed and tested real traction power feeding system focused on the amplification of harmonic current. The calculation results from the proposed approach and the measurement data from the test are widely described in the paper.