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시스템엔지니어링 강화를 위한 임무보증 Framework 연구
김광해,조철훈,고정환,정의승,Kim, Kwang Hae,Cho, Chul hoon,Ko, Jeong Hwan,Chung, Eui Seung 한국시스템엔지니어링학회 2014 시스템엔지니어링학술지 Vol.10 No.2
In recent years, the United States have been several major failures of launch. As a result of these failures, activity of mission assurance valued. Mission assurance is defined as the application of systems engineering process towards the goal of achieving mission success. Therefore, mission assurance perform independent technical assessments throughout the concept and requirements definition, design, development, production, test, deployment, and operations phases. Space system program was emphasized the importance of the system engineering for that required huge cost and long term development. For this reason, independent review and verification of mission assurance is essential. Mission assurance gives us confidence to proceed with launch and best opportunity for mission success. In this study, framework of mission assurance is proposed by foreign case analysis.
MnO<sub>2</sub>와와 금속담지활성탄의 물리적 혼합물을 이용한 NO의 저온 선택적 촉매 환원 반응
최종철,조철훈,정광은,전종기,임진형,박영권,Choi, Jong Cheol,Cho, Chul-Hoon,Jeong, Kwang-Eun,Jeon, Jong-Ki,Yim, Jin-Hyeong,Park, Young-Kwon 한국공업화학회 2008 공업화학 Vol.19 No.1
$MnO_2$와 K 또는 Cu 담지 활성탄으로 이루어진 혼성촉매상에서 암모니아를 환원제로 사용한 NO의 저온 선택적 촉매 환원반응을 수행하였다. 반응물에 산소를 투입한 경우 NO의 제거율은 증가하였으며, 활성탄에 전이금속을 담지할 경우 탈질 효율이 증가한다. 수분이 존재하지 않는 경우 $MnO_2$와 K 담지 활성탄으로 이루어진 혼성촉매가 $120^{\circ}C$의 저온에서 가장 높은 탈질 효율을 보였으나, 수분이 존재할 경우 모든 촉매의 활성은 현저하게 떨어졌다. 수분 존재 시 $MnO_2$와 질산처리/열처리를 한 Cu 담지 활성탄을 물리적으로 1 : 1 (w/w) 비율로 혼합한 촉매가 $MnO_2$와 Cu 담지 활성탄을 단독으로 사용한 것에 비해 탈질효율이 더 우수하였다. Selective catalytic reduction (SCR) of NO with ammonia was carried out over the physical mixture of $MnO_2$ and K or Cu-loaded activated carbons (AC) at low temperature. Introduction of oxygen affected positively the reduction of NO. Metal-impregnated AC showed significantly enhanced catalytic activity. Without water, the mixed catalyst of $MnO_2$ and K-loaded AC exhibited the best activity in the reduction of NO at $120^{\circ}C$. On the contrary, the activities of all the catalysts were significantly diminished in the presence of water. The mixed catalyst of $MnO_2$ and Cu-loaded AC treated with nitric acid and heat (1 : 1, w/w) exhibited the better activity for the reduction of NO than each single catalyst in presence of water.
전영두(Young-Doo Chun),박종찬(Jong-Chan Park),조철훈(Chul-Hoon Cho),박동수(Dong-Soo Park),정의승(Eui-Seung Chung) 한국항공우주연구원 2006 항공우주기술 Vol.5 No.2
본 문서는 KSLV-I의 해상운송과정에서 겪게 될 진동하중조건의 기초자료 획득을 위해 수행된 해상운송 측정결과를 요약정리 한다. KSLV-I은 부산에서 전남 고홍 외나로도의 우주센터로 해상을 통해 운송될 예정이다. 해상운송시의 진동하중은 발사체나 이송치구를 설계할때 반드시 고려되어야 하는 설계인자 중 하나로서, 실제 해상운송시의 하중을 측정하여 그 크기를 확인해야 할 필요가 있다. 본 문서에서는 KSLV-I을 수송할 선박과 동일한 규모인 바지선(예인선으로 견인)을 대상으로 운항중에 3축가속도와 3축각속도 신호를 측정 하여 해상운송하중을 획득한 결과를 보여준다. 그 결과 기존의 미군사규격이나 Zenit-3SL(Sea Launch)의 하중조건보다 양호함을 확인할 수 있었다. This article summarizes the results of sea transportation load measurements, which will be used as the reference to the sea transportation environment condition for the launch vehicle of KSLV-I. KSLV-I will be transported by Sea from Pusan to the NARO space center in Gohung, Chunnam province. Since the vibration load condition during sea transportation is considered as one of the important design parameters of KSLV-I and its transportation means, it is necessary to directly measure the environmental condition of sea transportation loads prior to establish the sea transportation plan in detail. This material includes the measured data of 3-axis linear accelerations and 3-axis angular rates on the board of a barge-ship, which is towed by a tug boat during shipping operation. This barge-ship is same class with one which will actually carry KSLV-I. The results show that the measured load condition during sea transportation is not severer than the reference data of MIL-STD-810F and Zenit-3SL launch system.
Supercomputing by Internet Based PCs
Kim, Seung-Jo,Cho, Jin-Yeon,Lee, Chang-Sung,Cho, Chul-Hoon,Ji, Kuk-Hyun 서울대학교 항공우주신기술연구소 2000 항공우주신기술연구소 연구보고 Vol.1 No.2
In this work, Internet Supercomputing methodology is introduced and the concept is realized for large-scale finite element analysis. The primary resources of Supercomputing by Internet based PCs are numerous idling PCs connected through Internet with no regards to their locations. The computing ability of hundreds or thousands PCs networked by Internet can be as powerful as that of supercomputer such as CRAY T3E if these PCs are utilized for solving a problem simultaneously through an efficient parallel computing algorithm. Under the above concept, a virtual supercomputing system InterSup I is constructed and tested. To establish the InterSup I system, 64 PC nodes, which are located in several places and connected by Internet, are conscripted. By the established InterSup I system, linear static analyses of finite element model having around five million DOFs are solved through the parallel multifrontal solver and the time dependent behaviors of structures are investigated with parallel explicit algorithm. Also, the eigen value analyses are conducted through the block Lanczos procedure and parallel multifrontal technique. From these supercomputing results, Supercomputing by Internet based PCs can be considered as one of the cheapest ways as well as one of the most powerful ways to high performance computing (HPC) such as large-scale finite element analysis.