http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
국부가열과 국부냉각을 이용한 U단면을 가진 빔위 가변단면 성형공정 개발에 관한 연구
박종철(J. C. Park),성대용(D. Y. Seong),이성욱(S. U. Lee),양동열(D. Y. Yang),차명환(M. H. Cha) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The development of a forming process to fabricate profiles with variable cross-section can expand the range of application areas of a roll forming product. In order to fabricate ‘U’ cross-sectional profiles with variable cross-section, a new forming process employing local heating and local cooling is proposed. The effects of the process parameters on formability related with a shape error are investigated by FE-analyses. Plastic strain occurs in the local heating region that can be controlled by the proposed forming process. By employing local heating and local cooling, formability of the profiles with variable cross-section is improved.
3점 굽힘 실험에서 강화 피라미드형 코어를 가지는 샌드위치 소재에 대한 파손 모드에 관한 연구
이성욱(S. U. Lee),양동열(D. Y. Yang) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Construction of sandwich materials involves a composite material structure of light weight, high strength and good dynamic properties. In recent days, demands for materials with high strength and light weight are ever increasing. In this study, a micro sandwich structure named as “shaped-sheet pyramidal truss core” is proposed to improve the mechanical strength by changing the cross-sectional shape at the central portion of the core. In the sandwich with the reinforced pyramidal truss core, elastic buckling and yielding of the reinforced core, elastic wrinkling and yielding of the face sheets of the sandwich, and the plastic buckling of the reinforced core and plastic wrinkling of the face sheet after yielding have been identified as the six competing modes of failure. Analytical expressions for the bending and compressive collapse strengths in each of these modes are derived and used to construct collapse mechanism maps for the sandwich panel with the reinforced core. The structural efficiency was affected by the ratio of thickness of face sheet (tf/l) and the length of the core’s base(Lc/l). The maps are useful for selecting the geometries of the sandwich panel with the reinforced pyramidal truss core that maximize the collapse strength for a given relative density.
New C-Leg의 기능 분석을 통한 지능형 의지시스템의 발전 현황
이성욱(S. U. Lee),김석윤(S. Y. Kim),이영삼(Y. S. Lee) 한국재활복지공학회 2011 한국재활복지공학회 학술대회논문집 Vol.2011 No.11
This paper examine developments of intelligent prosthesis system by analysising founction of New C-Leg is made by Otto Bock in Germany. At first, it will describe gait pattern of normal people, and that will describe methode of appling in New C-Leg. Second, it will introduce C-soft that is finely changing movement with matching users habit. At least, it will describe mode change about exercise.
용융탄산염 연료전지용 금속분리판의 굽힘변형에 관한 연구
이성욱(S. U. Lee),성대용(D. Y. Seong),이창환(C. H. Lee),양동열(D. Y. Yang),강동우(D. W. Kang),이태원(T. W. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The electrolyte matrix (MEA) of MCFC is used for electronic insulation and ionic communication between electrodes. Due to the weak mechanical strength of ceramic materials, the matrix is easy to crack when the cells are moved and stacked. In this study, bonding between the shield slot plate and the electrode is used to prevent the crack. Bonding reduces the deflection of MCFC cells, bending behavior in particular. The small deflection of matrix is derived from the bonded structure of MCFC cells. Under 3-point bending test with the bonded structures, it is shown that the bonded structure is strong against bending. Bonding between the shield slot plate and the electrode is necessary to prevent the crack of the matrix.