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정선환,최성대,최명수,손재율,맥이사 알렉산더,김신호 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.4
The inherent problem of a Darrieus wind turbine is its inability to self-start. Usually, a motor is used to provide angular acceleration until lift forces are produced in the airfoil blades or up until the turbine can already sustain its speed on its own. This paper describes a method of improving the self-starting of an H-type Darrieus vertical axis wind turbine (VAWT) by incorporating a helical Savonius turbine thus utilizing a drag-lift combination. The effect of each turbine in the combination relative to each other is investigated by testing a prototype windmill consisting of three NACA 0015 airfoil blades combined with a Savonius rotor with a helix angle of 180 degrees and whose swept area equals 30% of the entire turbine.
구리 박막의 그래핀(Graphene) 및 열처리에 의한 전기적-기계적 물성 영향에 관한 연구
김상민(Sang-Min Kim),황보윤(Yun Hwangbo),맥이사알렉산더(Mag-isa Alexan),오충석(Chung-Seog Oh),이학주(Hak-Joo Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The important use of copper thin films as a reliable interconnect material for integrated circuits is hampered by reliability issues one of the most noted of which is the increased resistivity at the micro and nano scale attributed to grain boundary scattering. The usual approach to this problem is the annealing of copper at a high temperature. Graphene growth on copper via Thermal CVD includes the annealing of copper. This work examines the effects of graphene growth on the resistivity and mechanical properties of copper. Resistance measurement coupled with Digital Image Correlation were performed on dog-bone shaped specimens of copper (18 um thick), thermally anneal copper and graphene growth copper. Raman spectroscopy was performed to examine the graphene layer while an AFM was used to examine the surface topography of the copper and annealed copper surfaces.