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양병춘(Byeong-Chun Yang),김형진(Hyung-Jin Kim),김재동(Jae-Dong Kim),고성위(Sung-Wi Koh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Present study investigated the effect of fiber direction, applied load and sliding speed on the friction and wear for the carbon fiber reinforced composite. The friction coefficient of composite, the specific wear rate and the surface roughness of friction track were measured. The friction and wear mechanisms were discovered from the worn surface of specimen. The friction track of counterpart and wear particle were observed by an optical microscope and a SEM. The effects on friction and wear behavior were observed differently according to the fiber direction of composite, sliding speed and applied load. Also the friction and wear mechanisms were represented differently according to the surface roughness of friction counterpart. High wear resistance and low friction coefficient were obtained in the AP direction, when sliding occurred on the specular-processed stainless steel disc. The specific wear rate indicated at least twice higher than that of the friction counterpart on all fiber direction of composite.
회절광학소자의 최적 설계를 위한 Iterative Fourier Transform Algorithm의 수렴성에 관한 연구
김휘,양병춘,박진홍,이병호,Kim, Hwi,Yang, Byung-Choon,Park, Jin-Hong,Lee, Byoung-Ho 대한전자공학회 2003 電子工學會論文誌-SD (Semiconductor and devices) Vol.40 No.5
Iterative Fourier transform algorithm, (IFTA) is tile iterative numerical algorithm for the design of the diffractive optical elements (DOE), by which the phase distribution of a DOE converges on a local optimal solution. The convergence of IFTA depends on several factors 3s initial phase distribution, the structure of the degree of freedom on the observation plane, and the values of internal parameters. In this paper, we analyze tile dependence of the convergence of IFTA on an internal parameter of IFTA, the relaxation parameter, and propose a new hybrid scheme of genetic algorithm and IFTA to obtain more accurate solution. Iterative Fourier transform algorithm (IFTA)은 회절광학소자 (DOE)의 위상 분포를 구하기 위한 반복적 수치 해석 알고리즘으로서 회절광학소자의 위상 분포는 반복 과정을 통하여 국소 최적해로 수렴하게 된다. Ink의 수렴은 위상 분포 초기치, 관측면에서의 자유도의 허용 범위 및 알고리즘에 내재된 매개 변수들의 설정 값에 영향을 받는다. 본 논문에서는 IFTA의 내부적 매개 변수인 완화 변수(relaxation parameter)가 IFTA의 수렴에 미치는 영향을 분석하고 이를 토대로 보다 정확한 최적화 해를 얻기 위한 유전 알고리즘과 IFTA의 하이브리드 알고리즘을 제안한다.