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김용태(YOUNG T. KIM),정찬운(CHAN M. CHUNG),정대용(D.Y. JEONG),이종태(JONG T. LEE) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
A medium duty hydrogen-natural gas fueled engine using hydrogen enriched CNG fuel can obtain stable operation at ultra lean condition and reduce emissions extremely. Reduction of CO₂in its engine is the one of most benefit. In this study, compression ratio were investigated including performance of this engine. As results, it was found that phenomenon of pressure oscillation it means occurring knock was increased due to large specific volume of hydrogen when R_(dH2) was increased. Even if same compression ratio, pressure oscillation was remarkable according to increasing R_(dH2).
김용태(Y . T . Kim),유권(K . Yoo),정현채(H . C . Jung),이효석(H . S . Lee),윤용범(Y . B . Yoon),송인성(I . S . Song),최규완(K . W . Choi),김정룡(C . Y . Kim),최병인(B . I . Choi),최상운(S . W . Choi) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.2
N/A To investigate the prevalance of cholelithiasis in liver cirrhosis, a retrospective study using biliary ultrasonography was performed in 222 patients with liver eirrhosis and in 177 controls. Gallstones were found more often in cirrhotic patients (13.5%) than in controls (5.6%) (p<0.05). Their prevalence was the same in both sexes. The prevalence of gallstone increased in decompensated liver cirrhosis (p<0.05). The prevalence was higher in HBs-Ag negative liver cirrhosis than HBs-Ag positive liver cirrhosis (p<0.01). The linear trend of increasing prevalence with increasing age in non cirrhotic group was not observed in patients with liver cirrhosis. This study confirms, by means of sonography, the high prevalence of cholelithiasis in liver cirrhosis in Korean adults.