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8.5mm 이하 짧은 길이 임프란트의 후향적 임상 평가
권민정, 김영균, 윤필영, 황정원 대한치과이식임플란트학회 Journal of Dental Implant Research 10 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2007, 제 26권 2호 5 44-53 (10 pages)
1965년 Br°anemark1)에 의해 임프란트가 소개된 이 후 30여년간 임프란트의 장기적 안정성을 높이기 위 한 기초 및 임상 연구는 끊임없이 이루어져 왔다. 그 결과 이제 임프란트는 치아 결손부를 치료하는 중요 한 치과 술식의 하나이며 장기간 평가에서도 좋은 임 상 성적을 나타내고 있다. -
Three-dimensional porous graphene materials for environmental applications
Muruganantham Rethinasabapathy, Sung-Min Kang, Sung-Chan Jang, Yun Suk Huh 한국탄소학회 Carbon Letters 13 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 1 1-13 (13 pages)
Porous materials play a vital role in science and technology. The ability to control their pore structures at the atomic, molecular, and nanometer scales enable interactions with atoms, ions and molecules to occur throughout the bulk of the material, for practical applications. Three-dimensional (3D) porous carbon-based materials (e.g., graphene aerogels/hydrogels, sponges and foams) made of graphene or graphene oxide-based networks have attracted considerable attention because they offer low... -
Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides
Mi-Seon Park, Sangmin Lee, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 1 1-7 (7 pages)
The effects of ammonia-treated graphene oxide (GO) on composites based on epoxy resin were investigated. Ammonia solutions of different concentrations (14?28%) were used to modify GO. Nitrogen functional groups were introduced on the GO surfaces without significant structural changes. The ammonia-treated GO-based epoxy composites exhibited interesting changes in their mechanical properties related to the presence of nitrogen functional groups, particularly amine (C-NH2) groups on the GO... -
Monolithic porous carbon materials prepared from polyurethane foam templates
Jo?o Pires, Andr? Janeiro, Filipe J. Oliveira, Alexandre C. Bastos, Mois?s L. Pinto 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 2 11-17 (7 pages)
Monolithic carbon foams with hierarchical porosity were prepared from polyurethane templates and resol precursors. Mesoporosity was achieved through the use of soft templating with surfactant Pluronic F127, and macroporosity from the polyurethane foams was retained. Conditions to obtain high porosity materials were optimized. The best materials have high specific surface areas (380 and 582 m2 g?1, respectively) and high electrical conductivity, which make them good candidates for supports in... -
고속철도 노반지지조건에 따른 임계속도효과의 동적응답
이일화, Lee. Il-Wha 한국지반공학회 韓國地盤工學會論文集 8 Pages
한국지반공학회 韓國地盤工學會論文集 2013, Vol.29 No.1 5-12 (8 pages)
철도노반에서 임계속도효과는 시간영역에서의 유사-공진현상으로서 차량의 주행속도와 노반표면파의 군속도대역이 중첩되면서 에너지가 증폭되는 현상을 의미한다. 과거에는 열차의 주행속도가 낮고 지반의 군속도가 높았기 때문에 문제가 되지 않았으나, 열차속도가 고속화되면서 임계속도효과가 궤도틀림에 영향을 미치는 것으로 보고되고 있다. 현재까지는 임계속도에 대하여 주로 이론적인 분석만 제시되었는데 실질적인 임계속도효과를 효율적으로 평가하기 위해서는 궤도 및 노반의 지지강성을 현장조건과 유사하게 고려하는 것이... -
나선홈을 갖는 반구형 공기 베어링의 반경 방향 성능 측정
박근형, 최정환, 최우천, 김권희, 우기명, 김승곤, Park. Keun-Hyung, Choi. Jeong-Hwan, Choi. Woo-Chon, Kim. Kwon-Hee, Woo. Ki-Myung, Kim. Seung-Kon 한국정밀공학회 한국정밀공학회지 8 Pages
한국정밀공학회 한국정밀공학회지 1999, Vol.16 No.2 23-30 (8 pages)
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Carbon rich fly ash and their nanostructures
Numan Salah, Sami S. Habib, Zishan H. Khan, Ahmed Alshahrie, Adnan Memic, Attieh A. Al-ghamdi 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 3 23-31 (9 pages)
spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.
