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김봉수,이소연,장인성,이준욱,홍상기,김영민,최완식,박종현,Kim, B.S.,Lee, S.Y.,Jang, I.S.,Lee, J.W.,Hong, S.G.,Kim, Y.M.,Choi, W.S.,Park, J.H. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.3
텔레매틱스 서비스는 컴퓨팅, 통신, 콘텐츠, 측위 및 자동차 산업의 융합 기술로서, 개별적으로 존재하는 서로 다른 기술의 통합을 통해 자동차 내에서 수행되는 새로운 서비스를 창출하고 있다. 텔레매틱스로 인하여 자동차는 이동 수단으로의 역할뿐만 아니라 제3의 디지털 라이프 공간이 되어 편리한 운전과 모바일 오피스 및 여가를 즐기는 공간이 되고 있다. 본 논문에서는 텔레매틱스를 위하여 개발되는 기술의 기능, 성능, 품질의 시험과 통합 운영을 위한 텔레매틱스 테스트베드의 국내외 기술 및 구축 동향에 관하여 기술한다.
김봉수(B. S. Kim),노동일(D. I. Roh),김경률(K. R. Kim),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a three-stage pancake-shape hot forging process is simulated with emphasis on prediction of under-filling defects due to air pocketing phenomena in the cavities enclosed by material, dies or tools and plane of symmetry. The basic approach is introduced to deal with air pocketing phenomena. The volumetric strain of each cavity is traced when the air pocket has no air hole and its pressure that is a function of the volumetric strain and maximum normal stresses of the neighboring contact interfaces is exerted onto the surface of material inside the air pocket. The presented approach is applied to a three-stage plate forging process in which the air pocketing phenomena can be sensitive to the plastic deformation of material. Predictions are compared with experiments, showing that they are in excellent agreement with each other.
중소형 내경 또는 외경 형상 열간 링롤링 공정의 시뮬레이션
김봉수(B. S. Kim),김응주(E. J. Kim),김경률(K. R. Kim),최무호(M. H. Choi),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this paper, a rigid-plastic finite element method is applied to simulating a ring rolling process. A warm or hot ring rolling process for a ball bearing outer race with profiled inner diameter and an automobile part with profiled outer diameter are studied by experiments and predictions. The predictions are compared with the experiments in terms of major dimensions, showing that they are quantitatively close to each other.
김봉수(B. S. Kim),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In this paper, an efficient approach to obtain approximate flower patterns of roll forming processes is proposed, which can help engineers to conduct conceptual design of roll forming processes with ease and efficiency. The approach is based on the plane strain assumption and the roll forming process is considered a multi-stage forging process. The roll profiles at the roll gap of each roll forming stand are considered die profiles of its associated forging process. The predictions are compared with predictions obtained by a three-dimensional finite element method. It has been shown that the present approach is worthy of being used for conceptual design of roll forming pass schedule.