http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김필환(P. H. Kim),이장욱(J. W. Lee),김진태(J. T. Kim),김창수(C. S. Kim) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, as the railway vehicles become speedy and massive, the collision is being regarded as an important factor for the assessment of safety for passenger. And the study of collision is being in progress more actively in advanced nations. In this study, the collision analysis is performed by using non-linear dynamic finite element program PAM-CRASH. The carbody used in analysis is made of Aluminum AL6005A to realize lightweight, and designed and manufactured by DHI (Daewoo Heavy Industry) lately. For the accuracy of the result in the practical collision, the experiment of material properties has been performed. The result of the analysis shows the underframe of rolling stock is the most important part as a collision energy absorbing structure. Further study is needed for optimal design which enables the carbody shell structure to disperse absorbing energy adequately.
캐스캐이드 냉동시스템의 프로판-에탄 냉매의 온도분포 특성
김필환(P. H. Kim),Eldwin Djajadwinata,정한식(H. S. Chung),정효민(H. M. Jeong),김철수(C. S. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Nowadays, demands on super low temperature condition for industrial and commercial uses are thriving. Considering of its wide application in the present and the future, study of the super-low temperature refrigeration system should be actively carried out. This study is aimed to investigate refrigeration capacity and coefficient of performance(COP) of the cascade refrigeration system, as well as to get the system which can reach evaporator temperature of -70℃. For this purpose, R290 and R170 are charged in high stage and low stage respectively. Finally the characteristics of system using R290 and R170 will be proposed.
이용훈(Y. H. Lee),박기태(G. T. Park),이경환(G. H. Lee),김필환(P. H. Kim),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Liquefied gas vaporizer means machine to vaporize the liquefied gas as liquid nitrogen(LN₂), liquefied natural gas(LNG), liquid oxygen(LO₂) etc. In the air type vaporizer, the frozen dew is also created by temperature drop (below 273 K) on vaporizer surface. This problem increases as the time progresses and humidity increases. In addition, the frozen dew gradually becomes frost deposit consequently, heat transfer through vaporizer decreases because frost deposit form adiabatic sheet. Because of this reason, recent vaporizer system is installed as parallel type, this vaporizer system needs more expensive installation costs and more space. This study carried out structure analysis on the material of vaporizer along the working fluid flow direction using liquefied super low temperature gas. The experimental study was investigated the heat transfer characteristics and performance on the tube length 4000 ㎜, 6000 ㎜ and 8000 ㎜ of three vaporizer models and was analyzed for evaluating the optimum efficiency on the vaporizer.