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이춘열(Choon Yeol Lee),배준우(Joon Woo Bae),윤덕용(Deok Yong Yun),배광훈(Kwang Hoon Bae),채영석(Young Suck Chai) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In nuclear power plant, fretting wear caused by flow induced vibration (FIV) accompanied with sliding and impact loading can make a serious problem between U-tubes and supports which are located in steam generators. In order to simulate the impact/sliding fretting wear, a fretting wear simulator was developed, which can perform classical fretting wear and impact/sliding fretting wear experiments under high temperature and high pressure environment. Before the complete analyses of impact and sliding fretting wear, finite element models for the dynamic characteristics by impact forces in steam generators are developed in this study. After verification of the finite element models in comparison with existing solutions, dynamic analysis of two dimensional tube-to-plate model is performed. Finally, based on the results by finite element analyses, impact velocity, kinetic energy and impact energy are calculated, which will be correlated with the wear amount measured from the experiments.
유방현(Bang Hyun Liu),김호균(Ho Kyun Kim),김덕규(Duk Kyu Kim),배광훈(Gwang Hoon Bae),김두연(Ku Yeun Kim),박혜경(Hae Kyung Park) 대한소화기학회 1982 대한소화기학회지 Vol.14 No.1
N/A HBsAg positivity and clinical studies in 49 cases with chronic active hepatitis, were carried out at Busan National University Hospital, from March 1978 to November 1981 The results were as follows: 1) Incidence of HBsAg was 67. 3% in cases with chronic active hepatitis. Sex distribution was 30 cases in male among HBsAg positive group and 19 cases in male among negative group. Mean age of HBsAg positive group was 35% years and negative group 43. 9 years, and there was a significant difference in mean age between both groups. 2) There was a history of acute hepatitis in 34 cases(69.4%), The interval between the acute attack and the diagnosis of chronic active hepatitis averaged 21.7 months. 3) In chemical liver function tests, SGPT and TTT were significantly increased in HBsAg positive group as compared with negative group, while SGOT, alkaline phosphatase and serum bilirubin showed no significant differences between both groups. 4) Immunoglobulin G and A were slightly increased in HBsAg negative group as compared with positive group, but there were no significant differences between both groups. 5) Jn 23 cases(13 cases with HBsAg positive and 10 cases with negative) who had been folloived for average of 20 months, incidences of improved, stabilized and aggravated cases showed no significant differences between HBsAg positive and negative group. But incidence of relapsed cases was significantly higher in HBsAg positive group than negative group.