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송지한(Ji-Han Song),남윤광(Yoonkwang Nam) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
HALE 무인기가 고고도에서 장시간 체공하기 위해서는 태양전지, 2차전지 등을 사용하여 지속적으로 비행에 필요한 에너지를 공급한다. 이중 태양전지 성능은 온도에 민감하게 반응하는데 일반적으로 주변 온도가 하강하면 태양전지 성능이 증가한다. 따라서 극저온에서 비행하는 무인기의 태양전지모듈의 성능은 지상보다 증가할 것으로 판단되나 변화량을 예측하기 어렵다. 고고도에서 열적 특성을 예측하기 위해서 무인기에 부착된 태양전지모듈에 대해 복합열전달 해석을 수행하고, 연구결과는 장기체공무인기 설계의 기초자료가 될 것으로 판단된다. HALE(High Altitude Long Endurance) UAV needs enough energy for long endurance in high altitude. It generally uses energy source such as solar energy, rechargeable batteries. Temperature plays an important role to determine both power output and electrical efficiency of solar arrays. Performance of Solar cell commonly is enhanced by decreasing module temperature. Therefore, it is anticipated that efficiency and power of solar arrays in high altitude field are more than ground. For predicting thermal characteristics of solar arrays, conjugate heat transfer analysis is performed with solar arrays on main wing. This result provides guidance for designing energy balance and flight profile of HALE UAV.
새만금간척지 지역 대기 중 초미세먼지 (PM2.5) 오염 특성 평가
송지한,김정수,홍성창,김진호 한국농공학회 2022 한국농공학회논문집 Vol.64 No.3
To understand the distribution characteristics of PM2.5 concentration in the Saemangeum Reclamation Area and nearby areas, three points of thebackground area, the occurrence area, and the affected area were selected and samples were collected for each season. The chemical composition wasdetermined. As a result of analyzing the chemical composition contained in PM2.5, NO3-(7.2 μg/m3), SO42- (4.3 μg/m3), NH4+ (4.3 μg/m3), OC (2.5μg/m3), Si (1.3 μg/m3) m3) and EC (0.5 μg/m3) seemed to be the main components, and NO3-, SO42-, NH4+, which are components that form secondaryparticles, occupied a large proportion. The composition ratio of PM2.5 was investigated in the order of ion component (56.8%) > Unknown (27.4%)> carbon component (11.8%) > heavy metal component (4.0%). During the PM2.5 high concentration case days, the ionic component accounted for90.7% during atmospheric stagnation cases, whereas the chemical composition ratio was in the order of ionic component (51.7%) > heavy metalcomponent (41.5%) > carbon component (6.8%) during yellow dust cases. It was found that the characteristic of PM2.5 in the Saemangeum reclaimedland and surrounding areas is mainly influenced by outside (domestic and overseas) throughout the year. Ion components accounted for the largestportion of PM2.5 components in this area, but there were few sources of SOx and NOx emission in the Seamangeum area, which are precursors forsecondary particle formation. Therefore, it is judged that most of these are generated and influenced as a secondary reaction in the atmosphere fromthe outside.