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인발 성형 공정을 이용한 carbon-glass hybrid composite 제작
박상윤,최원종,강길호,문초록,김세영 한국항공대학교 항공우주산업기술연구소 2002 航空宇宙産業技術硏究所 硏究誌 Vol.12 No.-
단면이 일정한 구조용 복합재료 제조공정에 널리 사용되고 있는 pultrusion 공정을 이용하여 glass-carbon fiber hybrid composite을 제조하였다. 열분석을 통하여 모재의 경화온도와 경화시간을 분석한 후 금형의 온도와 pulling speed를 결정하였다. 다양한 섬유 비율의 hybrid composite를 제작하였으며 flexural modulus를 측정한 결과 rule of mixture를 이용한 예상치 보다 높은 값을 보였다. Glass-carbon hybrid composite was manufactured by pultrusion process. The major processing conditions such as temperature of heating die and pulling speed have been fixed from thermal analysis results. Hybrid composites with various carbon fiber content were manufactured and flexural modules of each hybrid composite as measured. Compare with rule of mixture, positive hybrid effect was observed.
박상윤,최원종 한국항공대학교 항공우주산업기술연구소 2003 航空宇宙産業技術硏究所 硏究誌 Vol.13 No.-
In this study, the design and analysis of various energy storage flywheel types such as single material rotors(7075-T6, T300/epoxy, S2-glass/epoxy, and Kevlar/epoxy), multiple material rotors (S2 glass/epoxy+T300/epoxy), and hoop/helical wounded flywheel rotors were performed. An analytical model has been used to calculate the elastic stress of rotor systems subjected to internal force. The exact solution for rotating circular thick cylindrical shells has been obtained under assumption of axis-symmetric and plane strain conditions. Analysis results show that the behavior of flywheel rotors were strongly influenced by the key design parameters such as material properties and hoop/helical winding pattern. Also, the result of tradeoff study revealed that the multiple material rotor system was the most effective design concept for energy storage flywheel.
박상윤,이제호,박기복,이경희,이의돈,조경자,김민경,박영양,김해숙,명나혜 대한산부인과학회 1992 Obstetrics & Gynecology Science Vol.35 No.3
The reported cases of adenoid cystic carcinoma of Bartholins gland are extremely rare. We experienced two cases of adenoid cystic carcinoma of Bartholins gland. Authors presented two cases with a brief review o literatures.