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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.
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.
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.
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.
대학의 과학기술교유 어디로 가나 - 공학교육은 '산업일꾼' 목표로
김영진,Kim, Yeong-Jin 한국과학기술단체총연합회 2000 과학과 기술 Vol.33 No.10
공학의 궁긍적 목표는 과학지식을 활용하여 인간의 생활을 윤택하게 하는 물질, 제품 그리고 시스템을 만들어 내는 것이다. 공학교육의 문제점으로 지적된 진로를 무시한 획일적 교육이나 공학을 하나의 순수학문으로 취급하는 그릇된 교육방식은 하루빨리 개선되어야 하겠다. 또한 창출한 기술이 아무리 우수해도 사회에서 받아들이지 않으면 무의미하기 때문에 기술이 사회에 도입되는 과정을 풀어갈 수 있도록 하는 폭넓은 교육이 필요하다.
하드웨어-인-더-루프 기반의 배관 평가 시뮬레이터의 개발
김영진,허남수,차헌주,최재붕,표창률,Kim, Yeong-Jin,Heo, Nam-Su,Cha, Heon-Ju,Choe, Jae-Bung,Pyo, Chang-Ryul 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
In order to verify the analytical methods predicting failure behavior of cracked piping, full-scale pipe tests are crucial in nuclear power plant piping. For this reason, series of international test programs have been conducted. However, full-scale pipe tests require expensive testing equipment and long period of testing time. The objective of this paper is to develop a test system which can economically simulate the full-scale pipe test regarding the integrity evaluation. This system provides the failure behavior of cracked pipe by testing a wide-plate specimen. The system provides the failure behavior of cracked pipe by testing a wide-plate specimen. The system was developed for the integrity evaluation of nuclear piping based on the methodology of hardware-in-the-loop (HiL) simulation. Using this simulator, the piping integrity can be evaluated based on the elastic-plastic behavior of full-scale pipe, and the high cost full-scale pipe test may be replaced with this economical system.
김영진,Kim, Yeong-Jin 한국전자통신연구원 1996 전자통신동향분석 Vol.11 No.1
본 고는 전자통신시스템 및 단말기의 소형화 및 고기능화를 위하여 대두되고 있는 다중칩 모듈(Multichip Module; MCM)중 Laminate기술을 기본으로 하며 대량생산이 가능한 Multichip Module-Laminate(MCM-L)기술에 대하여 논하고 있다. 본 내용에는 전기 및 열특성을 결정하는 기판재료, Laminate에서의 Via 및 Pad의 한계, MCM의 성능과 관련된 시험방법 등이 있으며, 마지막으로, 통신 및 타분야의 MCM 응용사례를 조사분석하고 향후 MCM의 기술발전방향을 예측해 보았다.