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도시철도차량 유지보수 정보화 시스템을 위한 사고/고장 분류체계에 관한 연구
이호용(H. Y. Lee),박기준(K. J. Park),안태기(T. K. Ahn),김길동(G. D. Kim),한석윤(S. K. Yoon),이승일(S. I. Lee) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Failure code system must include data of maintenance history, classification of failure, affective range and situation when failure occur. But the present failure code system have used a simple code system for classification to include only merchandise and tools. Advantageously, expansional standard code system that will be developed, it make that users can take steps of standardized overhaul and inspection as proposal maintain contents when failure occur or something wrong in vehicle of urban transit. Standardized failure codes must be developed and used that manufacturing companies and urban transit operating companies in order to give effect to maintenance works.
두께가 급격히 변하는 영역에서 고분자 유동에 의한 복굴절
이호상(H. S. Lee),A. I. Isayev 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.1
A finite element analysis was carried out for a 4:1 planar contraction die for polymer melts using the viscoelastic constitutive equation of Leonov. Viscoelastic fluids showed significant differences in pressure drop and birefringence in contraction and expansion flows. The pressure drop was higher and the birefringence smaller in expansion than in contraction flow. The difference increased with increasing flow rate. The nonlinear Leonov model was shown to describe the viscoelastic effects observed in experiments.
이호생 (H. S. Lee ),오승택 (S. T. Oh ),김현우 (H. W. Kim ),최원재 (W. J. Choi ),윤정인 (J. I. Yoon ),이상규 (S. G. Lee ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
In this study, modified cascade cycles which are two staged Intercooler and pre-expander types are simulated and designed, then compared performance with basic cascade process which is the base in liquefaction process. These are included methane, ethylene and propane cycles. The COP of two staged intercooler type and pre-expander type were showed about 12.6% and 23.6% higher than basic cascade process, and specific power was decreased about 28.0%.