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대 면적 LCD에서 Patterned Spacer Color Filter 사용 시 발생하는 중력무라 분석
최석,정연학,김미숙,김귀현,김향율,김서윤,임영진,Choi, S.,Jeong, Y.H.,Kim, M.S.,Kim, G.H.,Kim, H.Y.,Kim, S.Y.,Lim, Y.G. 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.8
In recent, it is said that the trend of LCD is direction to pursue high qualities like as high transmittance, high contrast ratio, wide viewing angle, fast response time, and so on. Especially, it is known that these qualities are essential to large size LCD like as LCD TV and we can realize them through to uniform cell gap and deep black state. Until now, the ball spacer has been used to control of uniform cell gap. However, the existence of ball spacer inside the cell causes the deformation of the liquid crystal molecules and damage to alignment layer. Such a deformation of the liquid crystal causes light-leakage in the dark state, which lowers contrast ratio of the display. Nowadays, this problem has been solved by using Patterned Spacer on Color Filter. but Side Effect just as gravity mura has been induced. In this paper, we studied the mechanism on gravity mura in case of using patterned spacer on color filter.
일체형 순수유압식 브레이커의 민감도해석에 의한 성능 향상
최석(S. Choi),장효환(H. W. Chang) 유공압건설기계학회 2009 드라이브·컨트롤 Vol.6 No.1
The performance improvement of a small-size integrated-type fully hydraulic breaker is studied in this paper. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected and nearly optimized to maximize the impact energy as well as to improve the dynamic characteristics such as the piston upper chamber pressure, piston and valve displacements. As a result, the impact energy, blows per minute(bpm) and output power are increased by 52.9%, 1%, and 55.6%, respectively compared with the current design. The dynamic characteristics of the piston upper chamber pressure, piston and valve displacements arc also improved by the design change.