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김상석,김정호 한국광학회 2004 광학과 기술 Vol.8 No.2
최근 반도체, 영상정보 및 전자광학 분야 등 첨단 산업분야의 발전과 더불어 광학계의 경량화 요구가 높아짐에 따라 비구면 렌즈에 대한 수요가 급속히 증가하고 있는 실정이다. 일반적으로 비구면으로 구성된 광학계는 넓은시야와 고성능의 화상을 얻을 수 있을 뿐 아니라, 광학계를 소형, 경량화 시킬 수 있는 장점을 가지고 있어 현재, 종래의 구면 광학계가 비구면 광학계로 대체되고 있는 추세이다.(중략)
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,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.
피부 사상균증 환자에서 Trichophytin에 대한 피부 면역 반응
김상석,이호균,이종주 대한의진균학회 2001 대한의진균학회지 Vol.6 No.3
Background: The cell mediate immunity is of importance or the development of host resistance to dermatophytic infection. Objective: The aim of this study was to estimate the clinical usefulness of purified trichophytin and to correlate cell mediate immunity to the clinical parameters of dermatophytosis, i. e. duration of infection, localization of infection and the type of dermatophyte involved. Methods: For evaluation of cell mediate immunity in dermatophytosis, cutaneous immune reaction was measured in 102 patients with dermatophytosis (75 patient with chronic dermatophytosis and 27 patients with non-chronic dermatophytosis) by means of intradermal injection of purified trichophytin extracted from Trichophyton(T.) mentagrophytes. Results: The results are sumarized as fellows: Patients with chronic dermatophytosis were positive in 10.7% of cases, while 51.9% of the patients with non-chronic dermatophytosis showed positive delayed cutaneous reactions (p<0.05). Of the dermatophytes isolated, 81.4% of the patients were chronically inflected by T. rubrum Delayed cutaneous reactions occured in infections with T. rubrum in only 17.1% of cases, but this difference was not statistically significant (p=0.06). Of the patients with tinea cruris, delayed cutaneous reactions were registered in 50%, but only in 15.1% those with tines unguium (p<0.05). The significant difference in the rate of positivity in delayed reactions was not shown between the patients group with nail infection(15.1%) and the patients group without nail infection (28.6%). The rate of positivity in immediate and delayed reactions of the patients group in the multiple lesions (50%, 13.2%, respectively) was higher than that of the patients group in the single lesion (46.9%,26.6%, respectively). Conclusion: The present study reinforced the hypothesis that susceptibility to chronic dermatophytosis is related to a lack of cell mediate immunity to the infectious agents and clinically, purified trichophytin is good far the evaluation of host sensitization to dermatophyte antigens as well as cell mediate immunity in dermatophytosis. [Kor J Med Mycol 6(3): 150-159]