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차세대 SAR 탑재체를 위한 이중 수신 채널 T/R 모듈 설계
원영진(Young-Jin Won),윤영수(Young-Su Youn),우성현(Sung-Hyun Woo),윤재철(Jae-Cheol Yoon),금정훈(Jung-Hoon Keum),김진희(Jin-Hee Kim) 한국항공우주연구원 2012 항공우주기술 Vol.11 No.2
본 논문은 우주용 X-대역 능동 위상 배열 레이더를 위한 T/R 모듈에 대하여 기술한다. T/R 모듈은 위상 배열 안테나의 전자적 빔 조향을 가능하게 하는 송수신 RF 반도체 소자가 집적된 모듈이며 SAR 탑재체의 핵심 부품이다. 기존의 T/R 모듈은 수평 편파 또는 수직 편파 신호를 스위치에 의해 선택적으로 수신할 수 있었다. 그러나 현재 기술적 흐름은 수평 편파와 수직 편파 신호를 동시에 수신하는 것이다. 따라서 이중 편파 동시 수신 T/R 모듈에 대한 개발이 활발히 이루어지고 있다. 본 연구는 차세대 SAR 탑재체를 위한 선행 연구로서 능동 위상 배열 레이더 T/R 모듈의 기술 개발 동향과 이중 수신 T/R 모듈의 예비 설계 결과를 정리하였다. This paper describes the transmit/receive(T/R) module for the space based X-band active phased array radar. T/R module is the integrated module which is assembled by the transmitting and receiving RF semiconductor devices to enable the electronically beam steering of the phased array antenna and the key component of the SAR payload. T/R module can selectively receive the polarization signals by the switch according to the established technology but now the technological trend of the T/R module is to receive the horizontal and vertical polarization signal simultaneously. Therefore the research and development of the dual polarization receiving channel T/R module is actively in progress. In this study, as the prior research for the next generation SAR payload, the technological trend of the active phased array radar T/R module and the result of the preliminary design of the dual receiving channel T/R module were described.
남해권(Nam Hae-Kweun),윤영수(Yoon Young-Su),이정하(Lee Jeong-Ha),고순정(Koh Soon-Jeong),안연순(Ahn Yeon-Soon) 한국위험물학회 2020 한국위험물학회지 Vol.8 No.1
On APR 2018, a chemical/fire accident occurred due to static electricity spark during chemical filling process resulting in one injury, potential patients and destruction of the factory complex at a chemical factory in Incheon, South Korea. The objective of this research is to analyze the atmospheric sampling; and to investigate health impacts in firefighters. The baseline and aftermath atmospheric sampling was carried out at 14 spots. Health impact investigation was conducted in 114 firefighters using structured questionnaire. Lung function test was implemented in three subjects. The atmospheric sampling identified 14 chemicals including dichloromethane (239.36ppb), toluene (43.01ppb), methyl chloride (33.47ppb) and etc. 88/93 (94.6%) were male and mean age was 41.5 years old. 44 reported 157 symptoms including 31 respiratory (70.5%), 26 olfactory (59.1%), 20 ocular (45.5%) symptoms. Continued symptoms were 21 respiratory (47.7%), 18 olfactory ( 40.1%), 15 ocular (34.1%) symptoms. Identified psychological symptoms were 4 PTSD (4.5%), 10 GAD (11.0%), and 16 depression (17.2%). Self-reported exposure levels were ‘normal’ in 19 (20.4%) and ‘high’ in 17 (18.3%) subjects. The lung function test indicated slight shortage (FEV1/FVC=69%, reference value=70%) in 1/3 subjects. In conclusion, large proportion (46.2%) of firefighters reported symptoms and one third of the respondents claimed continued physical and psychological symptoms after the exposure. Accordingly, the symptoms should be readily investigated and treated in firefighters who responds to a chemical accident.
멀티죤 시뮬레이션에 의한 공동주택의 미생물 오염원제거 성능평가에 관한 연구
최상곤(Sang Gon Choi),박경수(Kyung Su Park),윤영수(Young Soo Yoon),홍진관(Jin Kwan Hong) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
The purpose of this study is to evaluate the efficacy of multizone simulation that enables to grasp of details about microbial contaminant problem in an multistoried apartment. We used actual indoor test data to figure up microbial contaminant level as initial value for the multizone simulation and estimated the various effects of indoor occupant infected with germs and the performance of air sterilization by using multizone simulation in substitute for infeasible expermental approach. The results show that natural ventilation make ourselves generally useful for removing indoor microbial contaminants. The results also show that the performance of air sterilization reach the maximum in the case of using mechanical ventilation and UVGI air sterilizer. The conclusion is that this multizone simulation is useful tool for actual design method for Immune building systems.