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송은석,김화용,김현수,이윤우,Song, Eun-Seok,Kim, Hwa-Yong,Kim, Hyoun-Soo,Lee, Youn-Woo 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.3
Micro- or nano-size particles are required to improve the combustion efficiency and stability in the case of solid explosives and propellants. The micro-structural properties of an energetic material strongly influence the combustion and explosion behavior. However, the traditional size reduction techniques, including milling, are not suitable for production of ultra-fine size particles. As an alternative to the traditional techniques, various re-crystallization processes based on supercritical fluids have recently been proposed. Supercritical fluids are fluids at temperatures and pressures above their critical point. In principle, they do not give problems of solvent contamination as they are completely released from the solute when the decompression occurs. Rapid Expansion Supercritical Solutions(RESS) and Supercritical Anti-Solvent Process(GAS/SAS) are representatives of a nano-size particle formation process of energetic materials using supercritical fluids. In this work, various fine particle formation processes using supercritical fluids are discussed and the results are presented.
RC 고층 건물의 기둥축소 해석보정 효과에 대한 변수 연구
송은석 ( Song Eun-seok ),김경찬 ( Kim Gyeong-chan ),김재요 ( Kim Jae-yo ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
본 논문에서는 철근 콘크리트 고층건물에서 발생하는 기둥축소의 정밀한 예측을 위하여 계측결과를 이용한 해석보정에 대하여 연구하였다. 해석보정의 변수는 해석보정 시행기준, 해석보정 값, 계측 위치에 따라 분류하였으며, 이 분류에 따라 해석보정 모델을 구성하였다. 이를 바탕으로 41층 규모의 철근콘크리트 건물의 시공단계해석에 대하여 해석보정 변수 연구를 수행하였다. 다양한 형태의 계측상황에 적용한 결과, 해석보정의 시행기준은 일정한 간격을 기준으로 해석 보정 할 경우, 해석보정 값은 오차 값만큼 보정할 경우, 계측 위치는 매 층 계측이 될 경우에 오차가 최소화되는 경향을 보였다.
비정질 수정 캔틸레버의 식각 공정 최적화 및 Q-factor 연구
송은석(Eun-Seok Song),김용권(Yong-Kweon Kim),백창욱(Chang-Wook Baek) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In this paper, optimal deep reactive ion etching (DRIE) process conditions for fused quartz were experimentally determined by Taguchi method, and fused quartz-based micro cantilevers were fabricated. In addition, comparative study on Q-factors of fused quartz and silicon micro cantilevers was performed. Using a silicon layer as an etch mask for fused quartz DRIE process, different 9 flow rate conditions of C4₄F?, O₂ and He gases were tested and the optimum combination of these factors was estimated. Micro cantilevers based on fused quartz were fabricated from this optimal DRIE condition. Through conventional silicon DRIE process, single-crystalline silicon micro cantilevers whose dimensions were similar to those of quartz cantilevers were also fabricated. Mechanical Q-factors were calculated to compare intrinsic damping properties of those two materials. Resonant frequencies and Q-factors were measured for the cantilevers having fixed widths and thicknesses and different lengths. The Q-factors were in a range of 64,000 ?108,000 for fused quartz cantilevers and 31,000 ? 35,000 for silicon cantilevers. The experimental results supported that fused quartz had a good intrinsic damping property compared to that of single crystalline silicon.