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자동차범퍼의 사출성형 해석결과와 실제 성형품의 비교 연구
황시현(S. H. Hwang),김철규(C. G. Kim),지성대(S. D. Ji),김명기(M. K. Kim),문영배(Y. B. Moon),정영득(Y. D. Jeong) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Importance of using an injection molding analysis has been increased. However the application of it has not been increased because the results of analysis do not sometime match to practical molding. Therefore, the difference of flow analysis and practical molding should be decreased. This study presents reasons of the difference for the location of weld-line in the flow analysis and practical molding on automobile bumper molding.
웨스팅하우스형 원전에서 가압기 안전밸브 개방고착 확률 리스크 영향 평가
오해철 (H. C. Oh),하정헌 (J. H. Ha),서미로(M.R. SEO),정백순 (B. S. Chung),김명기 (M. K. Kim) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In an effort to increase the quality of probabilistic safety assessments (PSAs), it is recommended that the component failure are included the impact of the accident progression phenomena, either in the accident sequence models or in the system models. During various accident sequences modeled in the PSA, the pressurizer safety valves (PSVs) of a pressurized water reactor (PSVs) may cycle numerous times. The PSVs will initially relieve steam. In some longer duration accident sequences, the steam relief will eventually become liquid relief. With each cycle of the PSV, there is a probability that the safety valve will fail to reseat. The PSV failure-to-reseat results in the need for additional mitigative systems to prevent core damage. This paper describes a quantitative assessment to identify risk impacts of the failure probability due to the repeated cycling operation of PSVs (pressurizer safety valves) in westinghouse type PSA.