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반응 용탕단조한 (Al2O3 SiO2+Ni) / Al 하이브리드 금속복합재료의 제조 및 특성
김상석,박익민,김성준,최일동 ( Sang Suk Kim,Ik Min Park,Sung Joon Kim,Il Dong Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4
N/A Mechanical properties of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites fabricated by the reaction squeeze casting were compared with those of (15%Al₂O₃·SiO₂)/Al composites. Al-Ni intertmetallic compounds (10-20㎛) formed by the reaction between nickel powder and molten aluminum were uniformly distributed in the Al matrix. These intermetallic compounds were identified as Al₃Ni using X-ray diffraction analysis and they resulted in beneficial effects on room and high temperature strength and wear resistance. Microhardness values of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composite were greater by about 100Hv than those of (15%Al₂O₃·SiO₂)/Al composite. Wear resistance of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites was superior to that of (15%Al₂O₃·SiO₂)/Al composites regardless of the applied load. While tensile and yield strength of (10Al₂O₃·SiO₂+5%Ni)/Al hybrid composites were greater at room temperature and 300℃, strength drop at high temperature was much smaller in hybrid composites.
김상석 ( Sang Suk Kim ) 한국현대영어영문학회 2014 현대영어영문학 Vol.58 No.1
The purpose of this thesis is to re-examine Graham Greene`s The Quiet American from the perspective of Post-colonialism. This thesis will address West`s imperialism over the East, racism against orientals and sexism which produces another relationship of domination and subordination between men and women. In particular, this thesis discusses imperialism in the context of sexism in that the colonized East is analogous to the passive and inferior position of women in relation to the dominance of Western men over women and of Western men over the East. The Quiet American illustrates the binary opposition of ``West`` and ``non-West`` which establishes the Western subject as central and the indigene as Other. This view is illustrated in two specific ways: from the depiction of an imaginary world called ``Greeneland`` and from the depiction of indigenous people of Viet Nam along with ``Third Force`` which will undermine colonialism, destroy communism and liberate Viet Nam. The novel also captures and represents problems and conflicts of race, class and gender. Re-examining The Quiet American from the post-colonial perspective illuminates Greene`s technique of revealing the imperialistic mentality. (Kyungnam College of Information & Technology)
김상석,김현욱,정상화,김혜정,김정호,Kim, Sang-Suk,Kim, Hyun-Uk,Jeong, Sang-Hwa,Kim, Hye-Jeong,Kim, Jeong-Ho 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.4
Global consumption of aspheric lens will expand rapidly due to golbal transformation of the electronics based industry to optics based mechatronics. Especially, F-Theta lens is one of important parts in Laser Scanning Unit(LSU) because it affects the optical performance of LSU dominantly. Non axisymmetric machine based processing techologies are required to obtain high accuracy in utlra-precision aspheric core, the most important component in plastic injection molded F-Theta lens assembly. In this study, the core with non-axisymmetric aspheric shape which is used to emit the F-Theta lens was processed using the ultra precision processing technology and the shape accuracy of the core was measured. And the results there of were evaluated and compared with the emitted shape accuracy of F-Theta lens.
성형용 초경합금(WC) 코어면의 Re-Ir 코팅이 형상정도와 표면조도에 미치는 영향에 관한 연구
김현욱,김상석,김혜정,김정호,Kim, Hyun-Uk,Kim, Sang-Suk,Kim, Hye-Jeong,Kim, Jeong-Ho 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.9
Aspheric glass lens have recently been used in camera phone module because they are more effective than spherical ones. In this paper, the grinding condition of the tungsten carbide molding core has been found after applying DOE to the development of the aspheric glass lens for the 3 Megapixel and 2.5x camera-phone module. Also, the ultra precision grinding process was investigated under this condition by experiment. Re-Ir coating was applied on the ground surface of the tungsten carbide molding core. The influence of Re-Ir coating on the form accuracy and surface roughness of molding core was compared and evaluated. The form accuracy and surface roughness of the molding core were improved by application of Re-Ir coating on the surface of the tungsten carbide molding core.
성형용 코어면 DLC 코팅에 의한 비구면 Glass렌즈 광학적 특성에 관한 연구
김현욱,차두환,이동길,김상석,김혜정,김정호,정상화,Kim, Hyun-Uk,Cha, Du-Hwan,Lee, Dong-Gil,Kim, Sang-Suk,Kim, Hye-Jeong,Kim, Jeong-Ho,Jeong, Sang-Hwa 한국광학회 2007 한국광학회지 Vol.18 No.5
본 연구에서는 3 메가픽셀, 2.5배 줌 카메라폰 모듈용 비구면 유리렌즈 개발을 목적으로 실험계획법(DOE)을 적용하여 성형용 초경 코어의 연삭가공조건을 구하고, 이를 활용하여 비구면 Glass렌즈 성형용 초경합금(WC) 코어를 초정밀 연삭가공을 수행하였다. 또한 가공된 성형용 코어의 가공면 위에 이온증착법으로 다이아몬드상 탄소(Diamond-Like Carbon; DLC) 코팅을 수행하여 DLC 코팅이 성형용 코어의 형상정도(PV)와 표면조도(Ra)에 미치는 영향을 평가하였으며, 비구면 Glass렌즈를 동일한 조건에서 성형하여 성형렌즈의 광학적 특성을 비교하여 성형용 코어면의 DLC 코팅 효과에 대하여 검토하였다. In this research, the optimal grinding condition has been obtained by design of experiment (DOE) fur the development of aspheric lens for the 3 Mega Pixel, 2.5x optical zoom camera-phone module. Also, the tungsten carbide (WC) mold was processed by the method of ultra precision grinding under this optimal grinding condition. The influence of diamond-liked carbon (DLC) coating on form accuracy (PV) and surface roughness (Ra) of the mold was evaluated through measurements after DCL coating using ion plating on the ground mold. Also, aspheric glass lenses were molded, some before DLC coating of the mold and some after the DLC coating. The optical characteristics of each sample, molded by the different molds, were compared with each other.