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가압열충격 사고시 클래드 하부균열 안전성 평가 방법에 관한 연구
김영진,김진수,구본걸,최재붕,박윤원,Kim, Yeong-Jin,Kim, Jin-Su,Gu, Bon-Geol,Choe, Jae-Bung,Park, Yun-Won 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
The reactor pressure vessel(RPV) is usually cladded with stainless steel to prevent corrosion and radiation embrittlement, and a number of subclad cracks have been found during an in-service-inspection. These subclad cracks should be assured for a safe operation under normal conditions and faulted conditions such as pressurized thermal shock(PTS). Currently available integrity assessment procedure for an RPV, ASME Code Sec. XI, are built on the basis of linear fracture mechanics (LEFM). In PTS condition, however, thermal stress and mechanical stress give rise to high tensile stress at the cladding and elastic-plastic behavior is expected in this area. Therfore, ASME Code Sec. XI is overly conservative in assessing the structural integrity under PTS condition. In this paper, the fracture parameter (stress intensity factor, K, and RT(sub)NDT) from elastic analysis using ASME Sec. XI and finite element method were validated against 3-D elastic-plastic finite element analyses. The difference between elastic and elastic-plastic analysis became significant with increasing crack depth. Therfore, it is recommended to perform elastic-plastic analysis for the accurate assessment of subclad cracks under TPS which causes plastic deformation at the cladding.
Vibrio tapetis의 검출을 위한 PCR specific primer의 제작
김영진,이선이,조효진,유선녕,김철민,최용락,박병근,안순철,Kim, Yeong-Jin,Lee, Sun-Yi,Cho, Hyo-Jin,You, Sun-Nyung,Kim, Cheol-Min,Choi, Yong-Lark,Park, Byoung-Keun,Ahn, Soon-Cheol 한국생명과학회 2007 생명과학회지 Vol.17 No.1
Brown Ring Disease (BRD) is a bacterial disease caused by Vibrio tapetis which affects cultured clam Ruditapes philippinarum and causes heavy economic losses on Atlantic coasts of france, Spain and England. In this study, to evaluate the effective detection of the pathogen, specific primer set based on 16S ribosomal RNA (rRNA) sequences designed for rapid detection of V. tapetis. Polymerase chain reaction (PCR) with this primer set produced the specific band for each V. tapetis. The length of PCR product using designed primer set of Vbts-F and Vbts-R was about 400 bp. Therefore, these primers will be provided with a basic tool for rapid detection of V. tapetis in the various cases such as examination of imported aquatic products, diagnosis of aquatic organisms, and etc.
일반 크리프 거동을 고려한 균열 구조물 C*-적분 예측
김영진,김진수,김윤재,Kim, Yeong-Jin,Kim, Jin-Su,Kim, Yun-Jae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
For assessing significance of a defect in a component operating at high (creeping) temperatures, accurate estimation of fracture mechanics parameter, $C^{*}$-integral, is essential. Although the J estimation equation in the GE/EPRl handbook can be used to estimate the $C^{*}$-integral when the creep -deformation behavior can be characterized by the power law creep, such power law creep behavior is a very poor approximation for typical creep behaviors of most materials. Accordingly there can be a significant error in the $C^{*}$-integral. To overcome problems associated with GE/EPRl approach, the reference stress approach has been proposed, but the results can be sometimes unduly conservative. In this paper, a new method to estimate the $C^{*}$-integral for deflective components is proposed. This method improves the accuracy of the reference stress approach significantly. The proposed calculations are then validated against elastic -creep finite element (FE) analyses for four different cracked geometries following various creep -deformation constitutive laws. Comparison of the FE $C^{*}$-integral values with those calculated from the proposed method shows good agreements.greements.
김영진,이선이,조효진,유선녕,김광연,최원철,허문수,안순철,Kim, Yeong-Jin,Lee, Sun-Yi,Cho, Hyo-Jin,You, Sun-Nyoung,Kim, Kwang-Youn,Choi, Won-Chul,Heo, Moon-Soo,Ahn, Soon-Cheol 한국생명과학회 2006 생명과학회지 Vol.16 No.7
Shrimp has efficient non-specific defense mechanisms based on activities of the hemocytes against pathogens. Up to now, it has been known that one of the non-specific immune reactions is related to mutual association among types of hemocyte, granular cell, semi-granular cell, and hyaline cell. In this study, we tried to know the effectiveness of feed-additives such as 5-aminolevulinic acid(ALA), chitosan, and hot-water extract of herb on immunity of shrimp (Penaeus chinensis) by hemocytic observation and SDS-PAGE analysis. Finally, we suggest a principle of the examination system for effects of various feed-additives.
복합균열이 존재하는 배관의 균열개구변위 계산을 위한 새로운 공학적 계산식
김영진,허남수,김윤재,Kim, Yeong-Jin,Heo, Nam-Su,Kim, Yun-Jae 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.8
An engineering estimation equation for the crack opening displacement(COD) is proposed for a complex cracked pipe, based on the reference stress approach. To define the reference stress, a simple plastic limit load analysis for the complex cracked pipe subjected to combined bending and tension is performed considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results.