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치과용 시술기구(Micro Handpiece)재료의 특성평가 및 표면품질에 대한 연구
손재환 ( Jae-hwan Son ),한창우 ( Chang-woo Han ),최상일 ( Sang-il Choi ),김용중 ( Yong-jung Kim ),최창진 ( Chang-jin Cho ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.3
As Industrialization gets more and more advanced, human technological medical apparatus for dentistry has been developed. Such a medical apparatus have to let precision revolution and torque control facilitate. Consequently, Development of Micro hand-piece with strong durability should be required. Moreover, It's also very important to evaluate performance of such a Micro hand-piece, Evaluation of Mechanical property of Material and ANOVA have been known as useful methods in the field of Quality Evaluation. For Verification of Quality Evaluation, It has been evaluated by One-way layout ANOVA based on the data of Surface Roughness Test. Anyhow, This test has been respectively carried out by 3 kinds of Test and Superior performance has appeared in the Test result
Photoreactions of Chloranil with Cyclic Olefins
Kim, Sung Sik,Cho, In Ho,Choi, Chang-Jin 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2
클로라닐과 1.5-시클로옥타디엔을 디클로 메탄 용매하에서 광반응 시킨 결과 (2+2)-광고리화 부가 반응에 의하여 스피로 옥세탄이 얻어졌다. 동일한 반응조건 하에서 클로라닐과 시클로헥센을 반응시킨 결과 스피로-옥세탄 뿐만아니라 확실한 구조가 밝혀지지 않은 사염화-히드록시화합물이 얻어졌다. 시클로헵타트리엔과 1.3-시클로헥사디엔의 경우에는 주 생성물로서 사염화-히드록시 화합물이 얻어졌다. Irradiation of a solution of chloranil and 1, 5-cyclooctadiene in dichloromethane yielded a spirooxetan by (2+2)-cycloaddition of a carbonyl group in chloranil. Irradiation of a solution of chloranil and cyclohexene under similar condition yielded a spiroxetan and also unidentified tetrachlorohydroxy compound. On the other hand, the photoreaction of chloranil with cycloheptatriene, and 1, 3-cyclohexadiene, gave the tetrachloro-hydroxy compound as the major product.