• 구강회복응용과학지
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• 제21권2호
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• pp.113-132
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• 2005

The purpose of this study was to assess the stress-induced pattern at the supporting bone, the implant fixture, the abutment and the abutment screw according to a friction-fit joint (Astra; Model 1) or slip- fit joint (Frialit-2; Model 2) in the internal connection system under vertical and inclined loading using finite element analysis. In conclusion, in the internal connection system of the implant and the abutment connection methods, the stress-induced pattern at the supporting bone, the implant fixture, the abutment and the abutment screw according to the abutment connection form had difference among them, and the stress distribution pattern usually had a widely distributed tendency along the inner surface of the implant fixture contacting the abutment post. The magnitude of the stress distributed in the supporting bone, the implant fixture, the abutment and the abutment screw was higher in the friction-fit joint than in the slip-fit joint. But it is considered that the further study is necessary about how this difference in the magnitude of the stress have an effect on the practical clinic.

• 한국공간구조학회논문집
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• 제7권3호
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• pp.141-151
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• 2007

The appearance of many Glass Fiber Reinforced Plastic (GFRP) constructions look like ordinary steel construction, because GFRP has been imitated by the same way with the traditional steel's cross section as well as connection system. In terms of detachable connection, there was not enough appropriate option of GFRP connection, such as a traditional bolt connection for steel and wood structures. Most of all, from material characteristic of GFRP related to the deficient ductility, the shearstress principle of GFRP s not proper for the material property, which causes ineffective and not economic application of material. With this research problem, the innovative and detachable onnection system, which is more considered with appropriate material characteristic for FRP, is developed. Not only short time but also long time research with various connection variations is carried out.

• 정보교육학회논문지
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• 제7권2호
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• pp.207-217
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• 2003

웹을 활용한 다양한 수업전략으로 정보의 수집을 통하여 지식을 구성하고 학습의 효율성을 높이는 개별학습과 타인과의 의사교환을 통해 책임감과 문제 해결력을 기를 수 있는 협동학습이 활발히 개발되고 있다. 그러나 현재 개발되어 있는 개별학습자료는 대부분 자료의 제시형태로 학습이 진행되어 학습자의 흥미를 유발하고, 문제에 대한 호기심을 자극하기에 적합하지 않다. 또한 협동학습자료는 현장의 교육과정과 연계성이 부족하여 수업 현장에서 적용이 어려운 실정이다. 따라서 본 연구에서는 다양한 사고력을 신장시킬 수 있도록 흥미있는 조작활동 위주의 자기주도적 학습을 적용하였다. 또한 의사 결정력과 ICT 활용능력을 향상시킬 수 있는 온라인 프로젝트학습을 함께 연계하여 운영이 가능하도록 사회과 교수-학습 시스템을 개발하였다. 본 시스템은 다양한 수업환경에 맞춰 융통성있는 운영이 가능하고, 형성평가를 통하여 수준별 학습이 이루어지며 평가결과는 피드백하여 활용할 수 있도록 개발하였다.