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RISS 인기검색어
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- 저자 : 김수상(Su-Sang Kim) (검색결과 3 건)
- 무료
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- 유료
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김수상,Kim, Su-Sang 한국정보통신집흥협회 1997 정보화사회 Vol.119 No.-
기업데이터네트워크를 좀 더 세분화해보면 Wide Area Network와 Local Area Network로 분류 할 수 있다. WAN은 기업의 본사, 전산센타 그리고 지점들간의 통신을 위하여 필요한 네트워크를 말하며, LAN은 본사, 전산센타, 지점내의 전산 자원들을 네트워크로 구성하는 것을 말한다.
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고속 고정밀 볼 스크류 구동에 따른 강제 냉각방식의 효과에 관한 연구
김수상(Su-Sang Kim),허철수(Zhe-Zhu Xu),김현구(Hyun-Koo Kim),류성기(Sung-Ki Lyu) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.3
Ball screw system is widely used as a precision mechanical linear actuator that translates rotational motion to linear motion for its high efficiency, great stiffness and long life. Recently, according to the requirements of high accuracy and stiffness, the pre-load on the ball screw which means of remove the backlash in the ball screw is usually used. Because of the preload which means the frictional resistance between the screw and nut, becomes a dominating heat source and it generates thermal deformation of ball screw which is the reason for low accuracy of the positioning decision. There are several methods to solve the problem that includes temperature control, thermal stable design and error compensation. In the past years, researchers focused on the error compensation technique for its ability to correct ball screw error effectively rather than the capabilities of careful machine design and manufacturing. Significant amounts of researches have been done to realtime error compensation. But in this paper, we developed a series of cooling methods to get thermal equilibrium in the ball screw system. So we find the optimum cooling type for improving positioning error which caused by thermal deformation in the ball screw system.
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이동현(Dong-hyun Lee),이호길(Ho-gil Lee),김수상(Su-sang Kim),김동준(Dong-jun Kim),배유종(You-jong Bae) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Billions of dollars are spent each year to repair damage to vehicles after collisions, many of which are low speed impacts. In an attempt to replicate real world bumper to bumper damage patterns, the Insurance Institute for Highway Safety(IIHS) has conducted new series of low speed bumper tests, and most bumpers of test vehicles are failed to protect expensive vehicle components from safety equipments to various exterior parts. This paper treats a process to study a frontal bumper structure to meet the new IIHS low speed bumper test revised on June 2006. In particular, this study focuses on improving the crash performance by means of diminishing repair costs, and approaches with two test subjects; a full overlap and a 15% offset frontal test. Throughout finding design parameters of a bumper beam, the optimized beam reinforcement and the required overlap percentage of a beam are found using the Design of Experiments (DoE) with help of CAE models. In addition, the paper shows a verification of the crash performance by correlating simulations and physical crash tests of carts and real cars. and eventually compares collision repair costs between manufactured and newly developed bumper systems.
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