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광학위성 영상품질요건에 따른 시스템 미소진동 분석 및 할당
이춘우,김인걸 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
고해상도 지구관측위성에 사용되는 반작용 휠 및 안테나 지향장치와 같은 구동기에서 유발하는 미소진동은 광학 초점면간 상대운동을 발생시켜, 위성 영향품질 저하를 초래하게 된다. 본 연구에서는 지구관측 위성의 영상품질요건을 기준으로 시스템 수준 미소진동 요건을 정의하는 방법과 세부요건할당, 시스템 미소진동 해석 및 검증을 위한 일반적인 절차를 소개하고자 한다. The image motion at the focal plane due to micro-excitation from driving devices such as RWA and Antenna Pointing Mechanism, can deteriorate the image quality especially for the high resolution imaging satellite. In the paper, we describe how to establish system micro-vibration requirements based on image quality requirement of Earth Observation Satellite and how to break down properly system requirements to each micro-vibration sources. And then the general procedure of system micro-vibration analysis and verification is presented.
이춘우,이기원,김영유,박선화,양신호,이상규 한국물리학회 2004 새물리 Vol.48 No.4
We investigated the photoluminescence characteristics of porous silicon at low temperatures. The photoluminescence of porous silicon was found to consist of two components, a 733-nm and a 810- nm peak. The intensities of those peaks increased with rising temperature up to ˘ 100 K, then, they decreased very gradually. These results were explained by considering the trapping levels in the silicon compound layer and the quantum connement eect in the silicon nanocrystal core.
신포광산(新浦鑛山) 형석(螢石)의 유체포유물(流體包有物에)에 관(關)한 연구(硏究)
이춘우,Lee, Choon Woo 대한자원환경지질학회 1969 자원환경지질 Vol.2 No.4
The Sin po fluorite deposit is of a fissure vein type which strikes $N75^{\circ}E$, dips $80^{\circ}SE$, and is embedded in the pre-Cambrian crystalline schist. The vein is 1 meter in average in thickness, about 800 meters in length and nearly 400 meters in depth. Narrow veins of crustified fluorites and agatic quartz are discontinuously embedded in the quartz gangue. Two-phase fluid inclusions, which are available for the homogenization method by using the Heating Stage Microscope 350, are found in the fluorite crystals. Most of the fluid inclusions are primary in origin and mainly composed of liquid phase associated with minor gas phase. They are tetrahedral, rounded-tubular, wedge shaped, rectangulartrapezoid, and irregular in shape. The maximum diameter of inclusions is 0.5mm and the minimum, 0.03mm, ranging from 0.2mm to 0.08mm in an average. The homogenization temperatures obtained from the test are $135-147^{\circ}C$, $125-138^{\circ}C$, $121-137^{\circ}C$, $116-133^{\circ}C$ and $106-128^{\circ}C$ in greenish, bluish, violet, light grayish blue, colorless and pinkish fluorites respectively. The range of formation temperatures of fluorites is $106-147^{\circ}C$. Therefore, the fluorite deposit of Sinpo Mine is considered to be of low temperature hydrothermal origin. The isothermal lines were drawn on the longitudinal section of the vein from the data of homogenization test. According to the results, the central and lower parts of the ore shoot in the west ore body show the higher temperatures of $130-138^{\circ}C$ and the peripheral and upper parts of it show the lower temperatures of $108-128^{\circ}C$. It seems that the isothermal trend roughly coinside with the pitch of the ore shoot.