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냉각 Cycle Matching을 위한 핀-관 열교환기의 설계 Program 개발
김재열,마상동,최충현 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2
The purpose of this study is to develop the optimum design program of air cooled fin-tube heat exchanger. Logarithmic mean temperature difference(LMTD) method which is generally acceptable is used to design the air cooled fin-tube heat exchanger. In the coventional heat exchanger design by LMTD method, heat transfer, overall heat exchanger coefficient, and heat exchanger area are calculated by using the inlet and outlet temperature of heat exchanger. The design for the two phase flow in the tube of heat exchanger can be applied to the design of considers by LMTD method. A performance comparison according to the different refrigerants is provided using R-134a and R-12. As the result of this study, total heat transfer rate of heat exchanger using R-134a were found higher than that of using R-12 for the same operating conditions.
LMTD Method를 이용한 휜-튜브 열교환기의 성능향상에 관한 연구
김명윤,마상동 서강대학 지역발전연구소 1999 지역발전연구 : 서강전문대 Vol.5 No.2
The purpose of this study is to develop the optimum design program of air cooled fin-tube heat exchanger. Logarithmic mean temperature difference(LMTD) method which is generally acceptable is used to design the air cooled fin-tube heat exchanger. In the conventional heat exchanger design by LMTD method, heat transfer, overall heat exchanger coefficient, and heat exchanger area are calculated by using the inlet and outlet temperature of heat exchanger. The design for the two phase flow in the tube of heat exchanger can be applied to the design of considers by LMTD method.
김재열,마상동,오성민,송경석,김양중,김창현,곽이구 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
In this study, the researches classifying the natural flaws in welding parts are performed using the signal pattern classification method. For this purpose 500MHz storage digital oscilloscope including FFT function and enveloped waveform generator are used and the signal pattern recognition procedure is made up the digital signal processing, feature extraction, feature selection and classifier design. Specially it is composed with and discussed using the distance classifier is based in euclidean distance the empirical Bayesian classifier. In feature extracting, it is performed using the class-mean scatter criteria. And the signal Pattern classification method is applied to the signal pattern recognition problems of natural flaw that is porosity inclusion, slag inclusion, lack of penetration, lack of fusion. center crack, side crack, toe crack. root crack as the planar and volumetric flaw classification problem. According to this results, if appropriately learned the neural network classifier is better acquire the recognition rate of 86.31% above through it is different a little according to domain extracting the feature and the classifier
이종민,마상동,한태룡,김공환,임상빈,정인식 경희대학교 생명자원과학연구원 1997 遺傳工學論文集 Vol.9 No.-
Supercritical fluids (SCF) are useful substances that are recently used in bioseparation process. Extraction of carthamin from safflower using supercritical carbon dioxide were examined at various conditions of temperature (35∼40℃), pressure (3000∼5000 psi) and CO₂ flow rate (900∼1200 m/hr). SCF was less effective than solvent methods in carthamin extraction from safflower. Concentration of carthamin was 50% more efficent at the use of alginate beads with 35 g cellulose per column loadings compared to the control (15g cellulose per column loadings).
김재열,유신,마상동,김창현 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
태아를 자궁외에서 인공양수로 충만한 Chamber에 넣고 막형산화기와 체외순환용 회로를 제대동정맥에 연결함으로서 염소태아의 자궁외 생존 모델을 수립하였다. 염소태아의 자궁외 최장 생존시간은 48시간이었으며, 염소태아의 자궁외 생존을 위한 혈류역학적, 혈액화학적 기초자료를 분석하였다. 태아의 자궁외 생존에 필요한 ECMO 순환 혈류량은 223±15.2㎖/min이었으며 태아생존률 및 태아생존시간에 체온, 마취시간, 태아체중 및 수술 숙련도등이 관계가 있었다. 인공양수를 채운 인공자궁 Chamber와 펌프, 막형산화기, 회로등이 연결된 인공 자궁태반의 프로토 타입을 고안 개발함으로서 동물모델에 의한 추가적인 연구를 가능하게 하였고, 합병증의 연구 및 태아영양공급과 발육문제등을 보완연구함으로서 인간에게 인공자궁태반이 실현될 수 있는 기반연구를 수행하였다. The ECMO system using umbilical cord and membrane type oxygenator which was connected with extracorporeal circulation unit was studied for the development of fetus growth model for goat. Maximum survival time of goat fetus was 48hour and its basic data of blood blow dynamics and chemical compositions were analyzed. Average blood rate required for the extracorporeal circulation was 223±15.2 ㎖/min and survival rate and survival time of fetus was deeply related to body temperature, total anesthetized time, fetus weight and skill for the surgery. The newly developed ECMO model for fetus corrected the problem of previously used ECMO that high pressure pump directly delivered to that fetal heart by installing reservoir bag. By applying the result from this new ECMO model. Further reserach will help to apply the system to human.