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김준형(J.H. Kim),윤영주(Y.J Yoon),이신주(S.J. Lee),정성환(S.H. Jung),이상옥(S.O. Lee),박점배(J.B. Park) 한국정보과학회 영남지부 2005 한국정보과학회 영남지부 학술발표논문집 Vol.13 No.1
본 연구는 실시간 영상 감지 시스템의 구현을 목표로 움직이는 물체의 광류를 찾고 해당 물체의 색상 정보를 이용하여 물체를 추적할 수 있는 영상 감시 시스템을 연구한 것이다. 움직인 물체의 색상정보와 CamShift 알고리즘을 이용하여 프로토타입을 구현한 결과, 정확한 물체 추적을 이용한 감시가 가능하였다.
CO2 레이저에 의한 탄소강의 표면경화시 온도구배와 이력현상
김도훈,윤영주 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.4
The rapid heating rate by the irradiation of CO₂laser on the C-steel induced the increase of A_f temperature by about 250˚K. The desirable laser power density for the surface-hardening of medium C-steel for 5 second varied from 1.7×10³W/㎠ to 4.1×10³W/㎠ depending upon the hardened thickness. The calculated temperature gradient in the hardened layer was about 160˚K/min. Thus the desired thickness can be controlled by the selection of appropriate laser power density. When cold-worked medium C-steel was irradiated with a relatively higher laser power, the softened region with minium hardness was located between the hardened layer and the matrix. Meanwhile if the laser power was not enough to transform the laser-irradiated area into austenite, the softening of structure resulted from the relief of work-hardening. Although the turn-off of the laser irradiation caused the self-quenching of low C-steel, the cooling in air was not rapid enough to reach the critical value at which the martensite could be obtained.
CO₂레이저에 의한 합금강의 경화열 처리에 미치는 표면상태의 영향
김도훈,윤영주,박영서,김웅 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
The effect of surface conditions on the hardening heat-treatment of alloy steel by CO₂laser was investigated. If the heat flow was restricted to one direction along the axis of the steel bar specimen, the hardened layer of about 0.5 mm was obtained with the laser power of 10⁴W on the finely polished surface. When the surface was roughly polished, much thicker hardened layer was achieved with the same laser power due to the multiple-reflection effect at the surface. This fact proves that the laser absorption efficiency is higher on the rough surface than fine surface by ?? times, where R is the reflectance of laser beam on the surface and n is the degree of multiple-reflection on the surface.
김도훈,박영서,윤영주,김웅 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.4
The hardened layer of the high-C (1%) steel with a thickness of 25㎛ was obtained by the irradiation of CO₂laser with a power density of 2×10^5 W/㎠ for about 0.23 second (spot size of 0.23㎜, scanning speed of 6㎝/min). When the thickness of hardened layer was compared with the temperature calculated by the conduction of heat in solid, the hardening mechanism was due to the solid-state transformation in steel.