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나노 입자 증착 공정으로 제작한 TiO₂ 박막의 물 분해 장치 개발 및 특성 평가
최정오(Jung-Oh Choi),송성혁(Sung-Hyuk Song),한홍택(H. Thomas Hahn),안성훈(Sung-Hoon Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Nano-sized TiO₂ photo catalytic water-splitting technology has great potential for low-cost, environmentally friendly solar-hydrogen production to support the future hydrogen economy. Presently, the solar-to-hydrogen energy conversion efficiency is too low for the technology to be economically sound. The main barriers are the rapid recombination of photo-generated electron/hole pairs as well as backward reaction and the poor activation of TiO₂ by visible light. In response to these deficiencies, many investigators have been conducting research with focused on the enhancement of photo catalysis by modification of TiO₂. This paper focus on the development of TiO₂ film for water splitting system using nano particle deposition system(NPDS).
천두만(Doo-Man Chun),윤해성(Hae-Sung Yoon),송성혁(Sung-Hyuk Song),김형중(Hyung-Jung Kim),안성훈(Sung-Hoon Ahn) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The number of engineering materials is increasing, and the product development cycle becomes shorter. At the same time, the requirements for product design become wider because the consumers are interested in the environmental aspect and aesthetic aspect as well as functional aspect. Under this circumstance, engineering designers should consider the multi-dimensional aspects for product design at the same time. However, there are few tools for multi-dimensional design method. Most design methods can support optimization of one dimension or provide information of each dimension. In this research, multi-dimensional design method was studied for engineering material selection. Material information contains material property, environmental impact, and cost. All numerical values of multi-dimensional information were demonstrated with graphical approach and the order of preferable materials was suggested.
생체 모방 기술에 응용 가능한 형상기억합금 선이 삽입된 복합재 해석
이혁(Hyeok Lee),이종구(Jonggu Lee),류정현(Junghyun Ryu),송성혁(Sung-Hyuk Song),안성훈(Sung-Hoon An),조맹효(Maenghyo Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, to imitate turtle’s wing, SMA(Shape memory alloy) embedded composite that has various stacking sequence is used. Bending and twisting deformation is induced by large phase transformation strain and recovering stress of SMA. In order to predict the deformation of composite, finite element method and analytical method based on the classical laminated plate theory are used. To represent the behavior of SMA, Lagoudas model is used. From this study, the bending curvature and twisting angle is estimated with respect to various stacking sequences and angles. The result obtained by analytical method shows a good agreement with the result obtained by FEM.