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RISS 인기검색어
- 검색키워드
- 저자 : 최명식(Myung-Sik Choi) (검색결과 89 건)
- 무료
- 기관 내 무료
- 유료
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최명식,계기성,강동완,Choi, Myung-Sik,Kay, Kee-Sung,Kang, Dong-Wan 대한치과보철학회 1990 대한치과보철학회지 Vol.28 No.1
This study was done to analyze the occlusal curve as one of the factors to be considered for maintenance of occlusal stability in the orthodontic and prosthodontic treatments. Sixty gnathological casts we.e obtained from 43 subjects with normal occlusion and 17 subjects with some of temporomandibular disorders. The occlusal surfaces of gnathologic casts were duplicated by using a Color kit SK-700 and tile reference points of X, Y coordinates were digitized by using the Summagraphic digitizer and 18AT computer system. The Z coordinates of cusp height were measured by 0.01mm measurable caliper. The mathematical computer program of least square method was used to analyze the occlusal curve arranged by three dimensional coordinates of X, Y, Z. The following results were obtained : 1. The occlusal curve of buccal and lingual cusp tips was fitted to the ellipse, and the occlusal curve of anterior teeth was fitted to a part of the circle in the analysis of conic sections. 2. The radius of Spee's curve showed individual differences, but was average 98.7mm in male subjects and 93.7mm in female subjects. 3. The radius fo Spee's curve according to the half of canine width showed the least coefficient of variation. 4. The radius of Spee's curve was not significantly relative to the lateral occlusal contacts on laterotrusion and the absence or presence of temporomandibular disorders. 5. The radius of Wilson's curve showed individual difference and the size of radius was followed by the order of 1st premolar, 2nd premolar, 2nd molar and 1st molar.
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최명식(Myung-Sik Choi),이경환(Kyung-Hwan Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The flame propagation in a gasoline engine has been measured through a high speed camera to understand combustion phenomena. The flame visualization has been performed at 1500rpm full load with and without knock, and 2000rpm part load condition on a DOHC single cylinder engine. At the beginning of engine start without preheating of the engine, misfire has occurred frequently and the color of flame is yellow. After an engine is heated and stabilized. the color of flame is blue. As knock is occurred in full load condition, there is a tendency .that the yellow flame is erupted more severely from intake squish area toward a center of a combustion chamber than full load condition without knock.<br/>
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