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유광선(Ryu Kwangsun),신구환(Shin Goo-hwan),차원호(Cha Wonho),강성원(Kang Seongwon),김용식(Kim Youngsik),강기환(Kang Gi-Hwan) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Photovoltaic power generation systems are attracting considerable attention as sources of electrical power that can replace or complement the current power generation systems that utilize fossil and nuclear fuels. So far, the costs for the solar PV systems are not competitive with other power generation systems. Since the cost of concentration optics bought in volume, are much lower than solar cells, there have been various efforts to lower the manufacturing cost using various concentrator optics. The artificial increase in the solar intensity incident on solar cells using lenses or mirrors can allow solar cells to generate equivalent power with a lower cost. There are two types of concentration optics for solar energy conversion. One is to use mirrors, and the other is to use Fresnel lenses. The gains that can be achieved with a Fresnel lens or a parabolic mirror are compared. The result showed the gains are comparable and the two configurations were developed competitively. In application areas of Fresnel lenses as solar concentrators, several variations of design were devised and tested. Some PV systems still use commercially available flat Fresnel lenses as concentrators. A convex linear Fresnel lens to improve the concentration ratio and the efficiency is devised and flat linear Fresnel lens in thermal energy collection is utilized. In this study, we designed and optimized flat Fresnel lens and the ‘light pipe’ to develop 500X concentrated solar PV system. In the process, we compare the transmission efficiencies of ‘groove in case’ and ‘grooves out case’. We performed rigorous ray tracing simulation of the flat Fresnel lenses. The computer aided simulation showed the ‘grooves in case’ has the better efficiency than that of ‘grooves out case’. InGaP/InGaAs/Ge triple junction solar cell is used to convert the photon energy to electrical power. As well as the optical performance of the concentration system, the field test results of the 500X concentrated PV system will be introduced.
조희근(Hee-Keun Cho),유광선(Kwangsun Ryu),차원호(Won-Ho Cha),이종섭(Jong-sup Lee),서미희(Mi-Hee Seo),최원호(Won-Ho Choi),명로훈(Noh-Hoon Myung) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.8
최신기술이 적용된 천구조 복합재 위성인 과학기술위성 3호 (STSAT-3)가 국내 최초로 재발 되었으며 2011년 발사예정이다. 모든 위성과 마찬가지로 과기 3호에는 다수의 탑재체가 탑재될 예정이며 그 주된 목적은 선진 우주기술의 과학적 검증에 있다. 제논 가스를 연료로 하는 홀추력기가 국내 최초로 개발되어 지상시험을 거친 후 과기3호에 탑재되었다. 본 연구는 홀추력기 개발에 적용된 전반적언 개발기술, 절차, 기능 빛 환경시험에 대한 내용이며 선진 우주기술 획득 및 차후 위성개발을 위한 기술자료 축적에 그 중요성이 있다. The STSAT-3 (science and technology satellite) is the first satellite whose entire structure was made of composite materials in Korea and it will be launched later in 2011. As like other small satellites, it is also equipped with several advanced instruments whose major objectives focused on the scientific tests in space. The HPS (hall thruster propulsion system) using xenon gas as a propellant has been developed and its overall ground tests were conducted. This research emphasizes on the technologies and procedure applied to the development of the entire HPS and its function and environment tests.
과학기술위성 3호 대용량 메모리에 대한 오류복구 코드 및 SEU 시험 결과 분석
서인호(In-Ho Seo),유광선(Kwangsun Ryu),오대수(Dae-Soo Oh),김병준(Byung-jun Kim) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.1
과학기술위성 3호 대용량 메모리를 SEU로부터 보호하기 위해서 4비트 심볼을 이용하는 RS(10,8) 코드를 개발 하였다. 따라서 32비트 데이터에 대해서 8비트의 페리티를 추가하였으며 1 심볼에 대해서 에러를 복구할 수 있다. 또한 우리별 3호의 결과를 이용하여 예상되는 SEU 발생률과 스크럽 주기를 계산하였다. 이 결과를 바탕으로 한국원자력 의학원에 있는 Cyclotron 양성자 가속기를 이용하여 SEU 시험을 수행 하였다. RS(10,8) Code by 4-bit symbol was developed to protect the mass memory of STSAT-3 from SEU in orbit. Therefore, one symbol can be corrected for 32-bit data with 8-bit parity configuration. Moreover, scrubbing period and SEU occurrence rate was calculated based on the KITSAT-3 result. A prediction of SEU rates was performed based on the ground experiment results with a proton accelerator in the KIRAMS(Korea Institute of Radiological Medical Sciences).
차세대 중형 3호의 Magnetic Cleanliness Algorithm
최정림,이동렬,이승욱,최두영,유광선,Cheong Rim Choi,Tongnyeol Rhee,Seunguk Lee,Dooyoung Choi,Kwangsun Ryu 한국우주과학회 2023 우주기술과 응용 Vol.3 No.3
One of the important ways to improve the performance of magnetometers in satellite exploration is to reduce magnetic noise from satellites. One of the methods to decrease magnetic noise is by extending the satellite boom. However, this approach is often not preferred due to its high cost and operational considerations. Therefore, in many cases, removing interference from the satellite platform in the measured dataset is widely utilized after data acquisition. In this study, we would like to introduce an algorithm for removing magnetic noise observed from magnetometers installed on two solar panels and one main body without a boom.