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Mie 산란 방법과 엔트로피 해석 방법을 이용한 혼합연료비에 따른 분무 균질도 특성에 관한 연구
이창희,이기형,이창식,배재일,Lee, Chang-Hee,Lee, Ki-Hyung,Lee, Chang-Sik,Bae, Jae-Il 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1
In this study, his technique was applied to a GDI spray in order to investigate the mixture distribution. In addition, the homogeneity degree and diffusion effect according to ambient temperature in the high pressure chamber were analyzed by using an entropy analysis method. From this experiment, we could find that entropy analysis is very effective method for the analysis of mixture formation, and the entropy values increase with the progress of uniformity in diffusion Process. we tried to provide the fundamental data for parameter which effects on the spray macroscopic characteristics with mixture ratio of diesel and gasoline. In addition, the mixture formation was analyzed by using entropy analysis. The entropy analysis is based on the concept of statistical entropy, and it identifies the degree of homogeneity in the fuel concentration. From the entropy analysis results we could find that the direct diffusion phenomena is a dominant factor in the formation of a homogeneous mixture at downstream of GDI spray especially in vaporizing conditions. As to increasing ambient temperature and increasing gasoline rate, the entropy intensity using the statistic thermodynamics method is increased because evaporation rate is higher gasoline than diesel.
이창희 대한영상의학회 1995 대한영상의학회지 Vol.33 No.4
Purpose : To evaluate the MR appearance of the accessory hepatic veins. Materials and Methods : The studyincluded 87 consecutive patients for whom abdominal MR images were obtained. The subjects who had liver lesion orhepatic vascular abnormalities were excluded. Couinaud classified accessory hepatic veins into inferior and middleright hepatic veins. Our major interests were evaluation of the incidence, morphology, and location of theaccessory hepatic vein. Results : Inferior right hepatic vein was demonstrated in 43 out of 87 patients(49%). Themorphology was linear in 35 patients(80.5%), and V-shaped in 8 cases(19.5%). In 40 patients(93%), the inferiorright hepatic vein was located in the posteroinferior aspect of the right lobe. Middle right hepatic vein wasdemonstrated in 7 out of 87 patients(8%). All were single linear in morphology, combined with the inferior righthepatic vein, and located between the right hepatic vein and inferior right hepatic vein. Conclusion : Theaccessory hepatic vein was demonstrated in 49% among the Korean adult population, and was located posteroinferiorportion of the liver, in 93%.