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김완두(W. D. Kim),우창수(C. S. Woo),이학주(H. J. Lee),정승일(S. I. Jung),김석원(S. W. Kim),김영구(Y. K. Kim),최경진(K. J. Choi),이동형(D. H. Lee) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
An air spring was accepted for rail vehicle secondary suspension to reduce and absorb the vibration and the noise. The air spring for the electric railway was developed with domestic technology, which consisted of a cord reinforced rubber bellows, a upper plate, a lower plate and a stopper rubber spring. The fatigue test was conducted in laboratory by using servo hydraulic fatigue testing system to verify the durability. And to guarantee the adaptation of this air spring, the ride comfort and the air pressure variation were measured in train test on Boondang line.
비정질 As₂S₃를 중간층으로 하는 Fabry - Perot 에탈론에서의 광쌍안정에 관한 연구
김강호(K. H. Kim),김석원(S. W. Kim),한성홍(S. H. Hahn) 한국광학회 1997 한국광학회지 Vol.8 No.6
광학 다층박막 증착법으로 비정질 As₂S₃를 중간층으로 하고 앞뒷면 거울의 반사율을 다르게 한 비대칭 Fabry-Perot 에탈론을 구성하고 광의 편광에 따른 광쌍안정 현상을 관찰하였다. 사용된 중간층의 광학적 두께는 광원인 Ar+(λ=514.5 ㎚) 레이저 광에 대하여 2λ가 되도록 하였다. Ar+ 레이저의 출력이 80~100 ㎽ 일 때 광쌍안정 현상이 관측되었고, 입사되는 광의 각 편광상태에 따라 반사와 투과하는 광의 경향이 서로 다름을 알 수 있었으며, 이는 광의 편광에 따른 비대칭 Fabry-Perot 에탈론내에서의 위상차가 입사광의 세기에 따라 다르기 때문인 것으로 해석되어 질 수 있다. We fabricated the asymmetric Fabry-Perot etalon which contains amorphous As₂S₃ as a spacer layer by using the method of optical multilayer coating and observed the optical bistability with the polarization. Optical thickness of the spacer layer is 2λ at Ar+ (λ=514.5 ㎚) laser wavelength. Optical bistability was observed at the intensities between 80~100 ㎽ and the experiment shows us that the trends of bistable loop of the reflected and the transmitted lights are quite different depending on the state of polarization. This phenomena can be explained as the phase differences of each polarizations are different in the nonlinear Fabry-Perot etalon.
사출금형의 5축 고속가공에서 공구자세에 따른 가공 특성에 관한 연구
강익수(I. S. Kang),김석원(S. W. Kim),김정석(J. S. Kim),이기용(K. Y. Lee) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The high speed machining has been widely applied to manufacture a die and machine elements product in industrial field. Especially, 5-axis milling has been employed to produce a wide range of turbine blades, impellers and complex molds. In this study, machining characteristics of injection mold was investigated according to tool position control. The cutting force and surface roughness were measured with various tool position angles. When the tool position angle was over 25 degree, the cutting force was decreased and surface roughness was good compared with low tool position angles.
김석원(S. W. Kim),김상기(S. K. Kim),정우섭(W. S. Jung),이채문(C. M. Lee),이득우(D. W. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In recent years, a demand for micro-structure machining is increasing by the development of information and optics industries. Micro machining technology is in general well known in the field of lithograghy. However, the requirement of producing micro machine and/or micro mechanism with metal materials will be increased since a variety of workpiece configurations can be easily made. In this paper, ultra precision machine is developed to obtain micro groove and mirror surface using single crystal diamond tool. According to the cutting experiment, no burr was found at the edge of V-grooves, and the surface roughness of copper is about 1~3㎚ Ra. It is verified that ultra precision machine is effective to high precision machining.