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자동차 공조장치용 응축기에 대한 해석적 및 시험적 연구
양시영(S.Y.Yang),송영길(Y.K.Song),정승교(S.G.Jeung),원종근(J.K.Won) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The purpose of this paper is to discribe the analytical and experimental approach to aid designing and developing the automotive air conditioning condensers. Some mathematical models of parallel flow condensers used in automotive air conditioning systems have been developed for the prediction of their performance under operating conditions. Using HFC-134a as refrigerant, heat rejection rate, pressure drops and outlet temperature are obtained for different air velocities and refrigerant mass flow rates. The agreement between the analytical solutions and experimental data is shown to be good. To know the characteristics of the performance for 6-different condensers was tested under same operating conditions. In this experiments, we have found that heat rejection rate and pressure drops can be described as 2nd order polynomial formulas of air velocitis and refrigerant mass flow rate. The data measured the performance in each condensers are useful for achieving optimum design of condenser geometries.<br/>
고가궤도에 근접한 자기부상열차 형상 주위의 3차원 난류유동에 대한 수치해석
맹주성(J. S. Maeng),양시영(S. Y. Yang) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.1
In the present study, the Reynolds-averaged Navier-Stokes equations, together with the equations of the k-e model of turbulence, were solved numerically in a general body-fitted coordinate system for three-dimensional turbulent flows around the six basic shapes of the magnetically levitated train (MAGLEV). The numerical computations were conducted on the MAGLEV model configurations to provide information on shapes of this type very near the elevated track at a constant Reynolds number of 1.48 X 10^6 based on the body length. The coordinate system was generated by numerically solving a set of Poisson equations. The convective transport equations were discretized using the finite-analytic scheme which employed analytic solutions of the locally-linearized equations. A time marching algorithm was employed to enable future extensions to be made to handle unsteady and fully-elliptic problems, The pressure-velocity coupling was treated with the SIMPLER-algorithm. Of particular interests were wall effect by the elevated track on the aerodynamic forces and flow characteristics of the six models calculated. The results indicated that the half-circle configuration with extended sides and with smooth curvature of sides was desirable because of the low aerodynamic forces and pitching moment. And it was found that the separation bubble was occured at wake region in near the elevated track.
원발성 간암 환자에 대한 경도관간동맥화학색전술과 병용한 전신적 FAM 화학요법의 치료 효과 - 자연경과군 및 전신적 FAM 화학요법군과의 비교 -
안병민(Byung Min Ahn),김부성(Boo Sung Kim),정규원(Kyu Won Chung),선희식(Hee Sik Sun),양진모(Jin Mo Yang),양시영(Si Young Yang),이상헌(Sang Heon Lee),최명규(Myung Gyu Choi),최상욱(Sang Wook Choi),백남종(Nam Jong Baeg),심규식(Kyu Sik S 대한내과학회 1991 대한내과학회지 Vol.41 No.1
N/A Hepatocellular carcinoma (HCC) is considered to be a highly malignant tumor with a poor prognosis. It is usually not resectable and there is no other definite treatment. Transcatheter arterial chemoembolization (TAE), now become one of the established treatments for hepatocellular carcinoma. We compared the therapeutic effects of TAE with systemic FAM chemotherapy with those of conservative treatment and systemic FAM chemotherapy alone in patients with large primary HCC during the last 3 years, retrospectively, in relation to prognostic factors, response rate, and survival time. In a total of 71 patients with large primary HCC and clinical status of Child grading A or B, 25 patients wen treated conservatively (Group A), 21 patients with systemic FAM chemotherapy alone (Group B), and 28 patients with TAE combined with systemic FAM chemotherapy (Group C). The results were as follows: 1) There was no complete response in any group. Partial response was archieved in only 2 patients (7%) in Group C. No change was observed in 5 patients (24%) in Group B and 13 patients (46%) in Group B and 13 patients (46%) in Group C. Otherwise, the rest of them made progress. 2) The survival rates at the end of the third and sixth months were 64% and 16% in Group A, 76%; and 24% in Group B, and 100% and 86% in Group C, respectively. 3) The average survival times of patients were 4.7 months in Group A and 5.8 months in Group B, which were not significantly different from those of Group A, and 13.1 months in Group C (p=0.001). The results suggest that the combined modality of TAE with systemic FAM chemotherapy is an effective palliative treatment that prolongs survival of patients with large primary HCC.