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스윙암 방식의 형상 측정기를 이용한 대형 반사경의 정밀가공에 관한 연구
이기암(Ki-Am Lee),김옥현(Ock-Hyun Kim),이응석(Eung-Suk Lee) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.3
Generally optical components are fabricated by grinding, lapping and polishing processes. Those processes take long time to obtain optical high surface quality. In the case of large optical components, the on-machine measurement is strongly recommended because the workpiece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm mechanism which can be used for on-machine measurement of a surface profile with a sensing probe end-effect, and also for grinding or lapping the surface with a corresponding tool. The measuring accuracy and uncertainty using a swing arm type profilometer have been studied. The experimental results show that this method is useful specially in lapping process with the accuracy of 5㎛. Those inspection data are provided for correcting the residual figuring error in next processes.
추가 상재하중을 받는 지중박스구조물의 우각부에 대한 프리플렉스 부재를 이용한 보강공법
정지승 ( Jee Seung Chung ),이진혁 ( Jin Hyuk Lee ),김기암 ( Ki Am Kim ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.5
This paper presents a new strength method of underground box structures under additional surface load. An L-bracing using pre-flexed steel member threads called the "Pre-flex strength method" is used to improve capacity of the RC box structure under earth pressure due to additional surface load. The pre-flexed steel member is fixed the top and bottom of the structure after chemical anchor was installed by drilling hole on the box structure. The structural performance was evaluated analytically. 3 types of underground RC box structure were used; 2.0m×2.0m, 3.0m×3.0m and 4.0m×4.0m. For the performance evaluation, structure analysis were performed on moment and shear resisting structures with and without pre-flex strength method. Numerical results confirmed that the proposed strength member system installed on underground RC box structures enhanced the strength capacity. The feasible region of the proposed pre-flex strength method in accordance with the earth pressure due to additional surface depth was evaluated.