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도시통근형 전동차 내 화장실 설치에 대한 승객 의식 조사
김재영(J. Y. Kim),최승보(S. B. Choi),최우석(W. S. Choi) 한국도시철도학회 2014 한국도시철도학회논문집 Vol.2 No.4
Although a city commuter train performs a basic means of transportation role at an one city, a city commuter train performed roles of urban commuter train railway as well as city commuter train due to a wide area of urban zone of life. For this reason, a city commuter train manufactured for the purpose of running of short distance running for more than two hours in numerous cases and passenger also spend 1~2 hours in a urban commuter train at one boarding in numerous cases. It is with this in mind that we wrote research paper by Passenger’s Questionnaire Survey - Case for the purpose of gathering the opinions from passengers about the commuter trains with toilet which is about train at its convenient.
장인혁(I.H Jang),최우석(W.S Choi),김보현(B.H Kim),박정국(J.K Park),김용재(Y.J Kim),조금배(B.H Beak) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
본 논문에서는 스테핑모터의 정 · 역회전 시간에 따른 속도제어 구동드라이버를 제안하였다. 모터의 속도와 위치를 단순연산으로 처리하여 가격 절감 효과를 가지고 왔으며, 각상의 제어 펄스폭을 측정하여 구동드라이버의 특성을 분석하였다.
충돌모의시험시 시험결과와 해석결과에 대한 변수 조절에 관한 연구
임재문(J.M.Lim),최우석(W.S.Choi),최중원(J.W.Choi),박경진(G.J.Park),신윤재(Y.J.Shin),이재협(J.H.Lee),김규현(K.H.Kim),윤경한(K.H.Yoon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
충돌모의시험을 컴퓨터 시뮬레이션하기 위하여 매개변수 (prameter)<br/> 조절과정(tuning process) 을 통하여 시험결과와 해석결과를 일치시켜 모델링을 완성시키는 절차를 확립하고자 하였다 . 매개변수로는 힘 -변형 합수의 보정계수 (scale factor)와 에어백의 질량호름을 곡선의 보정계수를 택하였다 . 매개변수 조절과정을 통하여 연구를 수행 한 결과 HIC 및 머리의 가속도곡선은 시험결과와 잘 일치하였다 . 가슴의 가속도곡선 및 대퇴부의 상해치 풍도 잘 일치시키기 위해서는 다목적합수에 기초한 최적화과정이 필요할 것으로 생각된다 .<br/>
안종곤(J. G. Ahn),송명영(M. Y. Song),최우석(W. S. Choi),이구철(G. C. Lee) 한국도시철도학회 2015 한국도시철도학회논문집 Vol.3 No.4
Uniaxial and biaxial torsional fatigue tests were conducted on the samples extracted from urban railway wheel steel. Ultimate and yield strengths of the steel were 1027.7 MPa and 626 MPa, respectively. The uniaxial fatigue limit was 422.5 MPa, corresponding 67% of the ultimate tensile strength. The ratio of was 063. Fatigue strength coefficient and exponent were 1319.5 MPa and 0.339, respectively. Maximum principal and equivalent strain were found to be adequate parameter to predict fatigue lifetime of the steel under multiaixal fatigue condition.
탄소나노튜브 캐소드에서 본딩재료가 전계강화와 전계방출 특성에 미치는 영향
신허영,김동희,안병건,최우석,정원섭,정우창,조영래 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6
Carbon nanotube cathodes with a high current density were investigated for use in flat panel displays. The field emission properties of cathodes fabricated by a screen-printing process were characterized in a high-vacuum chamber in the diode mode. The change in composition of the bonding materials comprise of a glass-frit and an Agpaste greatly affected the sheet resistance of the films after a heat treatment at 350℃. A higher volume fraction of insulating glass-frit in the bonding materials resulted in a larger value for the sheet resistance. However, the electric field enhancement factor(β) in the Fowler-Nordheim equation was not greatly affected by the composition changes of the bonding materials. Compared with the field enhancement factor, the current density was increased much more. Based on these findings, we conclude that the higher value of the current density was due to both an increased field enhancement factor and an increased number of carbon nanotubes protruding from the film surface. (Received May 10, 2004)