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이호일 ( H. I. Lee ),이만영 ( M. Y. Lee ),김장균 ( J. K. Kim ),서유미 ( Y. M. Seo ),강인중 ( I. J. Kang ),문건웅 ( K. W. Mun ),진승원 ( S. W. Jin ),노태호 ( T. H. Rho ),홍순조 ( S. T. Hong ),최규보 ( K. B. Choi ) 대한내과학회 2003 대한내과학회지 Vol.64 No.4
Background : The pheonomenon of QRS alternans in paroxysmal supraventricular tachycardia (PSVT) has been of continuing interest to cardiologists. However, the underlying mechanism and related factors of QRS alternans are still controversial. Methods : The
탄화수소계 냉매용 열펌프의 성능특성에 관한 실험적 연구
이호생(H.S.Lee),차동안(D.A.Cha),김재돌(J.D.Kim),한인근(I.G.Han),윤정인(J.I.Yoon) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Performance of a heat pump using hydrocarbon refrigerants are experimentally investigated. The working fluids for this study are R-290(propane), R-600a(iso-butane) as a natural refrigerant and HCFCs refrigerant R-22. The experimental apparatus is a conventional vapor compression type heat pump system. The performance of each refrigerant are obtained under several compressor speeds and the change temperature levels of secondary heat transfer fluids. The compressor work increased as the evaporating temperature increased and were a little higher using hydrocarbon refrigerant than HCFCs refrigerant. The increasement of refrigeration capacity with hydrocarbon refrigerant were better than R-22 according to the evaporating temperature. And COP increased linearly as evaporating temperature increased and showed the highest value when R-600a(iso-butane) was used as a working fluid. Experimental results showed some hydrocarbon refrigerants had better characteristics than R-22, that is, the natural refrigerants can be used as substitute for R-22.<br/> <br/>
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%.
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.
이호생(H. S. Lee),진병주(B. J. Jin),성광훈(K. H. Seong),윤정인(J. I. Yoon) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this study, evaporation heat transfer experiments were performed in 12.7㎜ micro-fin tube using natural refrigerants. The test rig had a straight, horizontal test section and refrigerant was heated by water through an annulus surrounding test section. Evaporation heat transfer coefficient was increased with increasing quality, refrigerant mass flux. The local and average evaporation heat transfer coefficients in micro-fin tube were compared to those a bare tube. The local evaporation coefficients of R-22 and natural refrigerants for the micro-fin tube were 131% and 96~124% higher than bare tube. EF(enhancement factor) is defined as the ratio of the micro-fin tube heat transfer coefficient to that of a comparable bare tube at a similar mass flux, heat flux, pressure level, and inlet outlet quality. EF of R-22 and natural refrigerants are presented average 2.68 and 2.41 at the all refrigerant mass flux in the experiment range.