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0.75Δ% 굴절율차를 가진 40채널 광파장 다중화 및 역다중화 소자 제작 및 특성
문형명,최기선,이길현,김동훈,이지훈,이동환,오진경,곽승찬,권오관,강동수,최준석,정건,이현용,Moon, H.M.,Choi, G.S.,Lee, K.H.,Kim, D.H.,Lee, J.H.,Lee, D.H.,Oh, J.K,Kwak, S.C.,Kwon, O.K.,Kang, D.S.,Choi, J.S.,Jong, G,Lee, H.Y. 한국광학회 2005 한국광학회지 Vol.16 No.3
[ $0.75delta\%$ ]의 평판광회로(PLC;Planar Lightwave Circuit)소자의 설계 및 제작기술을 가지고 저손실과 높은 누화율을 가진 파장 다중화 및 역다중화 소자를 개발하였다. C-band AWG(Arrayed Waveguide Grating)에서의 삽입손실은 2.503이하, 누화율은 35dB이상, 균일도는 1dB이하이며 L-band에서는 Vernier 디자인을 적용하여 ITU-T의 파장 정확도가 0.04nm이하가 되도록 제작하였다. A 40 channel arrayed-waveguide grating (AWG) filter operating in C-band and L-band wavelength regions has been fabricated using PLC (Planar Lightwave Circuit) processes with 0.75 refractive index difference. Its design was optimized for matching the center wavelength with the ITU-recommended wavelength. The characteristics of the fabricated C-band AWG are as follows; average insertion loss < 2.5 dB, polarization-dependent loss < 0.3 dB, non-adjacent crosstalk >35dB, and the loss uniformity of 0.8 dB. In the L-band AWG, wavelength accuracy is below 0.02nm.
[論文] 습식클러치용 마찰재의 조성별 마찰특성에 관한 연구
강전익(J.I.Kang),한홍구(H.G.Han),최웅수(U.S.Choi),권오관(O.K.Kwon) 한국자동차공학회 1990 오토저널 Vol.12 No.4
Wet-friction materials have been widely used for clutchs and brakes of auto motives over past several decades.<br/> In order to enhance its performance, its friction behaviour should be fully understood. It is, however, still not at hand and therefore an attempt was made to have some more understand. ing of friction behaviour of wet-friction materials.<br/> Measurements, of coefficient of friction were made with the variation of lubricants, lub.<br/> temperature, sliding velocity, and contact pressure.<br/> In addition, the effects of both the viscosity of lubricants and the porosity of materials on the coefficient of friction were also investigated.<br/> It can be concluded that the coefficient of friction is decreased as the cocentrations of the resin and inorganic fillers are increased, and it tends to decrease with the increase in the lubricant temperature and sliding velocity.