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공력에 의한 HEMU-400x 고속열차의 주행안정성 평가
최지훈(Choi, J.H.),박태원(Park, T.W.),심경석(Sim, K.S.),곽민호(Kwak, M.H.),이동호(Lee, D.H.) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.3
Recently, the speed of a train has been increased. So the trains are being exposed to wind more severely than before. Because of the operation of high speed trains and lightweight of the train, risks of train derailment have being increased. In this study, aerodynamic effects of a newly designed high speed train, HEMU-400x, are evaluated. For aerodynamic effect evaluation, analysis method is selected by examining the safety standards for high speed train. The condition of aerodynamic effects is selected by adverse effect conditions. In order to calculate $C_s$ coefficients, numerical analysis is conducted. Using $C_s$ coefficients, the side force is calculated. Through dynamics analysis, derailment and wheel unloading are obtained. Using these results, derailment evaluation is performed.
최지훈(J.H. Choi),이승욱(S.W. Lee),박명진(M.J. Park),김우석(W.S. Kim),최경달(K.D. Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
We have proposed a 100 MVA, 3 phases, 154 ㎸ class HTS transformer which will substitute for 60 MVA conventional transformer. In this paper, we designed conceptually the structure of the superconducting windings of a single phase 33 MVA transformer. The power transformer of 154 ㎸ class has a tertiary winding besides primary and secondary windings. So the HTS transformer should have the 3rd superconducting winding, it makes the cost of the HTS transformer high and the efficiency low. Further more we considered On Load Tap Changer (OLTC) in HTS power transformer. OLTC equipment is required for fitting to a power transformer by which the voltage ratio between the windings can be varied while the transformer is on load. We analyzed the electrical characteristics of the HTS transformer such as magnetic stress and AC loss.
분광분석법을 이용한 나트륨-수은 플라즈마의 열역학적 상태 변화에 관한 연구
최지훈(J.H. Choi),김창섭(C.S. Kim),지철근(C.K. Chee) 한국조명·전기설비학회 1991 한국조명·전기설비학회 학술대회논문집 Vol.1991 No.-
고압 나트륨 램프를 해석할 경우 일반적으로 열역학적 평형상태를 가정한다. 그러나 교류를 인가하여 시간에 따라 온도와 압력이 변할 경우 모든 시간에서 열역학적 평형상태가 만족하다고 할 수 없다.