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적외선 우주배경복사 관측 실험 2(CIBER2) 국제 공동 연구
이대희,박원기,문봉곤,박성준,김민규,김건희,남욱원,표정현,정웅섭,박영식,김일중,한원용,Lee, D.H.,Park, W.K.,Moon, B.G.,Park, S.J.,Kim, M.G.,Kim, G.H.,Nam, U.W.,Pyo, J.,Jeong, W.S.,Park, Y.S.,Kim, I.J.,Han, W. 한국천문학회 2015 天文學論叢 Vol.30 No.1
First light galaxies have predictable linear clustering, and are expected to produce fluctuations with a characteristic spatial power spectrum, which peaks at an angular scale of ~ 10 arcminutes and in the $1-2{\mu}m$ spectral regions. The Cosmic Infrared Background ExpeRiment 2 (CIBER2) is a dedicated sounding rocket mission for measuring the fluctuations in the extragalactic infrared background light, following up the previous successful measurements of CIBER1. With a 28.5 cm telescope accompanied with three arms of camera barrels and a dual broadband filter on each H2RG (${\lambda}_c=2.5{\mu}m$) array, CIBER2 can measure 6 bands of wide field ($1.1{\times}2.2$ degrees) up to 3 AB magnitudes deeper than CIBER1. This project is leaded by California Institute of Technology/Jet Propulsion Laboratory, collaborating internationally with Institute of Space and Astronautical Science in Japan, Korea Astronomy and Space Science Institute, Korea Basic Science Institute, and Seoul National University. The Korean team is in charge of 1) one H2RG scientific array, 2) ground station hardware and software, 3) telescope lenses, and 4) flight and test bed electronics fabrication. In this paper, we describe the detailed activities of the Korean participation as well as the current status of the CIBER2 project.
세라믹 마이크로 공구의 금속재 미세절삭 가공 특성에 관한 연구
김건희(G. H. Kim),정우철(W. C. Jung),허영무(Y. M. Heo),신광호(K. H. Shin),장성호(S. H. Chang),윤길상(G. S. Yoon),이근안(G. A. Lee),권영삼(Y. S. Kwon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this study, the efficiency of ceramic micro cutting tool with abrasive-type was evaluated by basic micro cutting experiments. Generally, micro drill and endmill made of tungsten-carbide which have sharply cutting edge are worn out rapidly. Therefore, ceramic micro tool which has minute bump feature was proposed in this study. In experiments, micro hole and slot shape were fabricated by ceramic micro tool. Finally the quality of fabricated hole and slot were evaluated and tool wear trend was observed by microscope.
고속카메라를 이용한 엔드밀 공구 변형 고찰 방법에 관한 연구
김건희(G.H. Kim),손종인(J.I. Son),전두성(D.S. Jeon),윤길상(Y.G. Yoon),허영무(Y. M. Heo),서태일(T.I. Seo),신광호(K.H. Shin),조명우(M.W. cho) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this paper, the real shape of macro and micro endmill deflection were observed by high-speed camera. This approach allows us to avoid modeling machining characteristics.(cutting forces, tool deflection and machining error etc.) For analyzing the endmill deflection, the real tool images were obtained by high-speed camera in endmilling processes using macro and mciro endmills. Finally, possibility of proposed method was verified by the analysis of captured images.