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대형 주·단조품의 온도 및 조직변화에 예측에 관한 연구
이명원(M. W. Lee),이영선(Y. S. Lee),이승욱(S. W. Lee),김상식(S. S. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Good control of thermal energy helps to increase characteristics and eliminate defects of large cast-forged part, such as large sized forged shell. Thermal energy control is a important factor. We have studied about forging process and after heat treatment process by FEM simulation. There are three ways of process. Changes of temperature and microstructure for forged shell were predicted according to temperature declination in large cast-forged product. So we will be able to choose the proper time heat treatment conditions by FEM simulation.
이명원(M. W. Lee),이영선(Y. S. Lee),이승욱(S. W. Lee),이동희(D. H. Lee),김상식(S. S. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Thermal energy control is a important factor in a large size casting and forging. Good control of thermal energy makes characteristics and defect of large cast-forged part, such as large sized forged shell. We have studied about not only large size ring forging process and after heat treatment by FEM simulation. Also, changes of temperature and microstructure for forged shell were predicted. Therefore, we can choose the proper heat treatment condition by FEA. The sectional properties confirmed by practical experiment and evaluation have presented possibilities of process design by computational analysis.
이승욱(Seung W. Lee),한영석(Young S. Han) 한국정보과학회 언어공학연구회 2004 한국정보과학회 언어공학연구회 학술발표 논문집 Vol.16 No.1
본 논문에서는 질의 응답 시스템에서 정답 추출을 위해 사용되는 표층 텍스트 패턴을 장거리 의존 문제에도 적용 가능하도록 확장하는 방법을 제안한다. 기존의 패턴 추출 시스템들의 패턴을 구성하고 있는 단어들간의 연속성과 불연속성에 대한 정보를 나타내도록 패턴 형태를 확장함으로써 장거리 의존 문제를 해결한다. 본 논문에서 제안한 형태의 패턴을 TREC-10의 질의를 이용해서 웹 데이터로 실험하여 정확도와 TREC의 평가 기준인 MRR을 사용해서 기존 시스템들과 성능을 비교했다.
주조 잉고트의 코깅공정시 기공압착 분석을 위한 유한요소해석
권용철(Y.C. Kwon),이정환(J.H. Lee),이승욱(S.W. Lee),정용수(Y.S. Jeong),김남수(N.S. Kim),이영선(Y.S. Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In the steel industry, there is a need to produce large forged parts for the automobile industries, the flight and shipping industries and military industries. In many steel-industry application, a cogging technique for cast ingots is required, because the major parts are needed as one large body in order to obtain higher quality. Therefore, cogging is the primary step in manufacturing of practically large open-die forging. In the cogging process, internal voids have to be eliminated as defects, The present work is concerned with the elimination of the internal voids in large ingots so as to obtain sound products. In this study, hot compression tests were carried out to obtain the flow stress of cast microstructure at different temperatures and strain rates. The FEM analysis are performed to investigate the overlap defect of cast ingots from the first ingot to bloom. Also the analysis of void closure are performed by using the DEFORM™ -3D.