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중거리급 탐색레이더 복합재 하우징의 T-joint 영역 구조 강도 평가
권민상,Kwon, Min-Sang 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.4
This article provides strength estimation of T-joint area which made of composite material. Inner and outer structures of medium range surveillance radar are all made of sandwich structure which is made with composite material(CFRP) and aluminum honeycomb core. Since the radar is voluminous and has very complex inner structure, the whole structure cannot be made as one piece. Therefore, usage of T-joints is inevitable. Since some of stress concentration areas were located around T-joint area, series of strength estimations were conducted. Three different configurations were tested to improve mechanical properties(primarily on strength). The results show an improvement on strength to meet calculated strength on stress concentrated T-joint area.
Selectivity and Oxygen Tolerance in PET-RAFT Polymerization
Min Sang Kwon(권민상) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
PET-RAFT polymerization has emerged as a promising way to synthesize well-defined polymers. Despite its remarkable development in recent years, the mechanism of PET-RAFT remains largely unclear due to the potential involvement of multiple competing pathways. In this presentation, oxygen tolerance (acceleration) and selecitivity will be discussed based on the mechanistic features of PET-RAFT polymerization.
정용인(Yong-In Joung),권민상(Min-Sang Kwon),류준석(Jun-Suk Ryu),박동명(Dong-Myung Park) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.8
본 연구는 능동형 안테나 시스템의 안정적인 임무수행을 위하여 열적 신뢰성을 고려한 방열설계에 관한 연구이다. 능동형 안테나는 송수신부에 고성능의 고발열 소자들이 존재한다. 안테나의 성능 유지를 위해서는 방열설계를 통해 고발열 소자들에서 발생하는 열을 효과적으로 제거하고, 적정한 온도범위에서 동작할 수 있도록 하여야 한다. 능동형 안테나의 송수신부는 고발열부로 액체냉각을 이용한 방열이 효과적이다. 본 연구에서는 능동형 안테나의 열적 성능을 만족하기 위하여 액체냉각 시스템을 포함한 방열설계를 수행하였으며, 이를 수치해석을 통해 분석, 검증하였다. In this paper, we studied on the thermal design of the active antenna system for stable performance considering thermal reliability. The active antenna has high performance and heat flux elements in T/R modules. Thermal heating of elements in T/R modules has to be dissipated effectively and the antenna has to be operated over the range of suggested temperature by the thermal design. T/R modules of high heat flux in the active antenna can be dissipated effectively by liquid cooling. In this study, we studied on the thermal design including the liquid cooling system to optimize the thermal performance of the active antenna. And the thermal design was verified by numerical analysis.
이원희(Won-Hee Lee),김호용(Ho-Yong Kim),김기완(Ki-Wan Kim),권민상(Min-Sang Kwon),김선주(Seon-Ju Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Thermal design is very important in the systems including high-density heat sources in order to ensure reliability. Especially, in the case of weight and power limitations, the optimal thermal design is required. Therefore, we proposed the heat spreader with junction layer by brazing to optimize the thermal design. The newly proposed heat spreader has improved thermal performance, which makes it possible to transfer heat from heat source to heat sink with high efficiency. In this paper, we cover the manufacturing method, the structural charateristics and thermal characteristics of the heat spreader. We also verify the heat transfer characteristics with the thermal analysis and experiments. As a result, new heat spreader has about four times larger thermal conductivity than that of aluminum heat spreader.