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이대희,남욱원,이성호,진호,육인수,김건희,박수종,Lee, D.H.,Nam, U.W.,Lee, S.,Jin, H.,Yuk, I.S.,Kim, K.H.,Pak, S. 한국천문학회 2006 天文學論叢 Vol.21 No.2
A Korean team (Korea Astronomy and Space Science Institute, Korea Basic Science Institute, and Kyung Hee University) takes part in an international cooperation project called CIBER (Cosmic Infrared Background ExpeRiment), which has begun with Jet Propulsion Laboratory (JPL) in USA and Institute of Space and Astronautical Science (ISAS) in Japan. CIBER is a rocket-borne instrument, of which the scientific goal is to measure the cosmic near-infrared extra-galactic background to search for signatures of primordial galaxy formation. CIBER consists of a wide-field two-color camera, a low-resolution absolute spectrometer, and a high-resolution narrow-band imaging spectrometer. The Korean team is in charge of the ground support electronics and manufacturing of optical parts of the narrow-band spectrometer, which will provide excellent opportunities for science and technology to Korean infrared groups.
이대희,양형석,남욱원,이성호,진호,김동락,박수종,김병혁,박성제,Lee, D.H.,Yang, H.S.,Nam, U.W.,Lee, S.,Jin, H.,Kim, D.L.,Pak, S.,Kim, B.H.,Park, S.J. 한국천문학회 2006 天文學論叢 Vol.21 No.2
We have tested the performance of the Proto-model of Space Infrared Cryogenic System (PSICS), which is a small infrared camera, developed by Korea Astronomy and Space science Institute (KASI), Korea Basic Science Institute (KBSI), Korea Institute of Machinery and Materials (KIMM), and i3system co., as a cooperation project. The purpose of PSICS is to ensure a technology of small infrared cryogenic system for future development of space infrared (IR) cameras. PSICS consists of cryogenic part, IR sensor and electronics part, and optical part. The performance test of each part and the integrated system has been completed successfully. PSICS will be used as a guiding camera for ground-based IR telescopes and a test system for developing a space-borne instrument.
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.
윤순현,김문경,이대희,Yoon, S.H.,Kim, M.K.,Lee, D.H. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
Heat transfer characteristics of a two-dimensional oblique impinging jet were experimentally investigated. The local heat transfer coefficients were measured by a thermochromic liquid crystal. The jet Reynolds number studied was varied from 10000 to 35000, the nozzle-to-plate distance(H/B) from 2 to 16, and the oblique angle($\alpha$) from $60^{\circ}$ to $90^{\circ}$. It was observed that the local Nusselt numbers in the minor flow region were larger than those in the major flow region at the same distance along the plate due to the higher levels in the turbulent intensity caused by more active mixing of the jet flow.
단계적 가변 메카니즘이 적용된 지능형 브레이커의 기술 제안
이대희(D. H. Lee),노대경(D. K. Noh),장주섭(J. S. Jang) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
If the impact mode can be changed automatically to obtain the optimum impact energy according to the strength of the rock during the crushing operation using the hydraulic breaker, the working efficiency of the breaker can be improved. Thus, the aim of this study is to implement an auto-sensing hydraulic breaker that automatically change of 4-step impact mode according to the rock strength through the development of the analysis model, and the analysis model is modeled using SimulationX. The analysis model of auto-sensing breaker with the 4-step variable mode was developed based on the analysis model of auto-sensing breaker with the 2-step variable mode developed in the previous research. From the analysis results, it was confirmed that the stepwise variable of the impact mode is implemented according to the rock strength. This study is expected to contribute to the development of hydraulic breakers one step ahead of existing auto-sensing breaker that only have 2-step variable impact mode.
이대희(D.H. Lee),차윤석(Y.S. Cha),이대근(D.K. Lee),이준식(J.S. Lee),임창율(C.Y. Lim),김영생(Y.S. Kim),배종렬(J.R. Bae) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An innovative crankless steam engine utilizing the rack and pinion has been developed to improve the thermal efficiency of the engine. This newly developed crankless steam engine converted the thermal energy of steam to the electrical power output by way of the rack and pinion instead of the conventional crank. Straight motion due to the rack changed to the rotary motion by the pinion gear of the clutch. The crankless steam engine performance was tested with steam at 5 to 6.5 ㎏<SUB>f</SUB>/㎠ and the power output varied from 2.4 to 8.0 ㎾. It follows that the maximum efficiency of the crankless steam engine has reached 74 % when the steam inlet pressure is 6.5 ㎏<SUB>f</SUB>/㎠ and the power output is 8.0 ㎾. The maximum efficiency of this engine is more than 2 times as high as the existing conventional crank engine.