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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.
직류급전시스템의 레일전위와 누설전류 관점에서의 설계 파라미터 연구
한문섭(Han Moonseob),정호성(Jung Ho-Sung) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
DC feeding system is mainly floating but the rail potential and the leakage current are created because of long parallelism between rails and ground. Rail potential causes electric shock to human and leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important recent DC feeding system. Normally during designing DC feeding system in terms of rail potential and leakage current, there are about 10 parameters. Four design parameters among those is analysed based on propagation theory that is utilized in order to simulate grounding system.
한문섭(Moonseob Han),이장무(Chang-Mu Lee),김재원(Jae-Won Kim),창상훈(Sang-Hoon Chang) 대한전기학회 2018 전기학회논문지 Vol.67 No.1
The voltage drop is important in electric railway for feeding a huge power of train on fixed feeding area. Nowadays it is tried to operate a high speed trains on conventional lines and there is problem on the voltage drop too. It is simulated on the conditions increased the turn ratio of trolley, installed autotransformer neutral line with variable taps. In result, it is compensated the voltage drop between ATs and better on last AT, not on the position of AT. And it is decreased a return current and neutral current of AT because of unbalance between trolley and feeder. It should be studied faster and more controllable the solid state switchs instead of the mechanical one in order to utilize this system.
한문섭(Moon-Seob Han),신효범(Hyo-Bum Shin),창상훈(Sang-Hoon Chang),김주락(Joo-Rak Kim),장동욱(Dong-Uk Jang) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.5
AC power supply system supplies power to railroad sections. In order to prevent collision of disordered power suppliers, neutral sections are constructed near the substations and sectioning posts. For these reasons, the study on automatic changeover system is in process. Also in order to verify the theory, field experiments on system constructed at Yongpo-ri SSP?which is included in Dae-bule pilot model railroad?is on the stage. In this paper, power transfer experiment results, which conducted by passing practical rolling stock(EL-8200s) through the neutral section where the power supplier is adopted, are presented. In order to measure the inrush current and abnormal phenomenon, the power transfer experiment had conducted with VCB switches and thyristor switches. Also in order to analyze the undergoing phenomenon affected by traction driving.
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..
한문섭(Han Moonseob),김형철(Kim hyungchul),나재두(Na Jae-Du) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
D.C. traction systems can cause stray currents which could adversely affect both the railway concerned and outside installations, when the return circuit is not sufficiently insulated versus earth. As experience for several decades has not shown evident corrosion effects from a.c. traction systems and actual investigations are not completed, stary currents flowing from a d.c. traction system is issued. D.C. traction systems can cause stray currents can be corrosion and subsequent damage of metallic structures, where stray currents leave the metallic structures. There is also the risk of overheating, arcing and fire and subsequent danger to persons and equipment. Any provision employed to control the effects of stray currents be checked, verified and validated. Direct measurement of stray current is difficult and a provision employed to control the effects of stray currents is proposed.