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치과임프란트 보철시 치관재료의 차이에 따른 응력 분산의 이차원 유한요소법적 연구
홍성기,조인호 대한치과이식임플란트학회 1993 The Korean Academy of Implant Dentistry Vol.13 No.1
The osseointegrated implant transmits any stress waves or shocks to the bone around the fixture because of direct contact with bone. The purpose of this study was to compare the stress distribution due to the different materials used for the dental crown in the implant prosthesis. The used dental materials were ADA type III gold alloy, acrylic resin, composite resin, porcelain. Cr-Co alloy, and their stresses were analyzed by the method of two dimension finite element. The results were as follows : 1. In the interface A and B, all the tested samples demonstrated maximum stress value at the cervical portion of implants. 2. In the interface A and B, there was no significant variations in stress value among the materials used for the superstructure. 3. In vertical section, maximum stress value appeared at the cusp tip of crown, and the differences of the stress distribution according to the dental materials were large at crown portion. 4. In the composite resin and porcelain, high stress concentrations were obseved at the implant super-structure, and stress value was high in the case of the Cr-Co alloy but low in the case of the gold alloy and the acrylic resin. 5. The Cr-Co alloy crown showed the narrowed stress distribution but high stress values in the interface between implant fixture and bony tissue. 6. Dental crown materials showed great influences on the implant abutment but small influences on the interface of bone and implant fixture. 7. The amount ant distribution of stress induced by occlusal forces were more influenced by fixture design and load direction rather than crown material itself.
公演藝術과 評論에 關한 硏究 : 舞踊을 中心으로 Based on dance
洪性起 慶北大學校 師範大學 體育學硏究會 1986 體育學會誌 Vol.14 No.-
On the basis of a study on the dance performance as a performance art I studied the criticism on dance which makes both spectators and dancers consciousness be on a bigher plane, and also makes a contribution to the development of the society, leading the dance performance, by the estimation of it with objectiveness, fitness and trustfulness. Owing to this study I could get the following results: 1. The function of the criticism 2. Problems of the criticism 3. The relationship between criticism, spectators and dancers 4. The present situation of the dance performance and the dance critic 5. Propositions for the improvement of criticism
문제해결력 신장을 위한 CAI프로그램 개발 및 적용에 관한 연구 : 원의 방정식을 중심으로 Focused on circular equations
朴達遠,洪成基 한국학교수학회 1999 韓國學校數學會論文集 Vol.2 No.1
The focus of this development program is to input multimedia materials into learning according to the trend of recent social changes and to maximize the learning effect for improving problem-solving by offering familiar teaching materials. The expecting effects of this study are as follows: 1. This program helps students acquire mathematical concepts and principles about circular equation through concrete examples using a variety of media - text, voice, sound, and animation and so on -, makes it possible individual learning which was difficult for students to expect at the existing multitude class as progressing learning each unit on the screen and the perfect learning by offering FEED BACK. 2. This program varied the difficulty of learning contents to learn according to learning abilities of learners by using animation and making the most of merits of computer and was able to improve learning effect by studying in a mutual way with managing learning procedure nonsuccessively. 3. Class using CAI program about developed circular equation unit has a positive effect on improving problem-solving by becoming from teacher centered class to student centered one. 4. This program makes students understand the contents of auxiliary learning in multimedia computer more efficiently, and cultivate abilities to adopt in accordance with changes in the future society by forming familiar computer mind.