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Hwang, InYoung,Park, Sang-Young,Park, Chandeok 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.1
A collision-free formation reconfiguration trajectory subject to the linearized Hill’s dynamics of relative motion is analytically developed by extending an algorithm for gravity-free space. Based on the initial solution without collision avoidance constraints, the final solution to minimize the designated performance index and avoid collision is found, based on a gradient method. Simple simulations confirm that satellites reconfigure their positions along the safe trajectories, while trying to spend minimum energies. The algorithm is applicable to wide range of formation flying under the Hill’s dynamics.
황인영(Inyoung Hwang),신소민(Somin Shin) 한국항공우주학회 2017 韓國航空宇宙學會誌 Vol.45 No.8
지구관측위성에 탑재되는 자료처리/저장장치 방열판은 장비의 주기적인 고발열, 배치, 장착성 등 설계 특성으로 인해 쉴드가 장착된 홈 형태를 갖는다. 홈 형태 방열판의 영향성과 쉴드 방열판의 열성능을 확인하기 위해, 평판 방열판을 기준으로 홈 형태의 방열판과 쉴드 방열판을 비교하여 열진공 시험을 실시하였다. 시험결과를 바탕으로 view factor에 의한 열교환과 방열판의 온도를 이론해석적으로 분석하여 열 설계 성능비교의 타당성을 입증하였다. The radiator of the data storage and handling units onboard the earth observation satellite is a groove-type radiator covered with a shield because of the periodic high heat dissipation and design characteristics of arrangement and mountability of the unit. The effect of the groove-type radiator and that of the shield versus plane radiator were verified through the thermal vacuum test. Through the test result, the temperatures of the radiator and the heat exchange due to the view factor were analyzed by using the analytical method. Conclusively the thermal performance of the shield dissipation plate was verified.
Enhancing Stability of Perovskite Solar Cells to Moisture by the Facile Hydrophobic Passivation
Hwang, Insung,Jeong, Inyoung,Lee, Jinwoo,Ko, Min Jae,Yong, Kijung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.31
<P>In this study, a novel and facile passivation process for a perovskite solar cell is reported. Poor stability in ambient atmosphere, which is the most critical demerit of a perovskite solar cell, is overcome by a simple passivation process using a hydrophobic polymer layer. Teflon, the hydrophobic polymer, is deposited on the top of a perovskite solar cell by a spin-coating method. With the hydrophobic passivation, the perovskite solar cell shows negligible degradation after a 30 day storage in ambient atmosphere. Suppressed degradation of the perovskite film is proved in various ways: X-ray diffraction, light absorption spectrum, and quartz crystal microbalance. This simple but effective passivation process suggests new kind of approach to enhance stability of perovskite solar cells to moisture.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-31/acsami.5b04490/production/images/medium/am-2015-044903_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b04490'>ACS Electronic Supporting Info</A></P>
차량 경량화용 CFRP 이중모자형 단면부재의 계면수 변화에 따른 에너지흡수 특성
양인영(Inyoung Yang),차천석(Cheonseok Cha),편석범(Seokbeom Pyeon),황우채(Woochae Hwang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
CFRP (Carbon Fiber Reinforced Plastics) of the advanced composite materials as structure materials for vehicles has a widely application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness. the In this study, CFRP double hat-shaped section members was manufactured. The static collapse tests performed with change of the stacking condition, such as interface numbers. The collapse mode and energy absorption capability were analyzed.