http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김영철(Y.C. Kim),최종욱(J.W. Choi),김성초(S.C. Kim) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.1
Thermal-fluid analysis is performed numerically to figure out the characteristics of heat transfer in a thermosyphon varying with the aspect ratio of geometry and the filling ratio of working fluid. The computational results are reasonable compared with the experimental data and visualized. The thermal resistance and the convective heat transfer coefficients are evaluated with the aspect ratio of thermosyphon and the filling ratio of working fluid, respectively. In conclusion, the thermal resistance decreases as the length of evaporator increases. However, the variation of a condenser length is nearly independent on the thermal resistance. In order to raise the performance of thermosyphon, the working fluid needs to be filled over 75%. In addition, Nusselt numbers in the evaporator and the condenser show 275 and 304, respectively.
김영철(Y.C.Kim),전중함(J.H.Chun),김광태(K.T.Kim),유권종(K.J.Yu),서기영(K.Y.Su),이현우(H.W.Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper present a buck-boost PWM inverter and its application for residential system The PWM power inverter is realized by driving a inverter constructed with a high frequency buck-boost chopper in the discontinuous conduction mode(DCM).<br/>
Thermodynamic properties of five-layered HgBa2Ca4Cu5O12+y from equilibrium magnetization
Y.-T. Kwon,M.-S. Park,J.-D. Kim,최기영,정명화,김영철,이성익,A. Iyo,K. Tokiwa 한국물리학회 2010 Current Applied Physics Vol.10 No.4
By using the Hao–Clem model, we analyzed the equilibrium magnetization of the grain-aligned HgBa2-Ca4Cu5O12+y (Hg1245) with Tc □ 108 K. We obtained thermodynamic parameters, such as the penetration depth [γab(0)] and the coherence length [□ab(0)] from the thermodynamic critical field [Hc] and the Ginzburg–Landau parameter [k]. Compared to the four layered superconductor HgBa2Ca3Cu4O10+y (Hg1234),the obtained penetration depth was slightly increased indicating that the Cooper pair density of Hg1245was decreased, which was one of the reasons why the transition temperature (Tc) of the Hg1245 did not increase as compared to the Hg1234. The expected increase of Tc for the material with the more CuO2planes was not achieved because of the insufficient doping of the Cooper pairs while adding CuO2 planes.