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RISS 인기검색어
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- 저자 : Jinhwan Yoon(윤진환) (검색결과 11 건)
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윤진환(Jinhwan Yoon),박정선(Jungsun Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Electric vehicle is a noteworthy future transpotation and it must be light as much as possible. Also a knuckle is very important components composing steering parts. Simulated annealing is a stochastic optimizing method based on the simulation of thermal annealing. So, we tried to optimize knuckle shape with respect to weight and stess using simulated annealing.
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온도감응성 하이드로젤과 은 나노패턴 기판으로 구성된 유연한 태양광 차단용 스마트 필름의 투광도 특성 연구
김도완(Dowan Kim),윤진환(Jinhwan Yoon) 한국고분자학회 2019 폴리머 Vol.43 No.1
Smart windows adaptively screen the sunlight that enters into the room, thereby reducing the cooling cost by restraining the increase of room temperature. Traditional glass-based smart windows have been extensively studied, but it is difficult to manufacture the curved or flexible glazings. In this study, we developed a film-type hybrid smart windows that can show the tansmittance change in response to both external temperature and electric energy, which is achieved by using the thermosensitive hydrogel and transparent silver nanopatterned film. The thermosensitive hydrogel was injected in the space between the films, and the optical transition from transparent to opaque state can be induced by the phase transition of the thermosensitive hydrogel. We found that the silver nanopatterned films effectively generated the heat by the Joule-heating mechasim, leading the phase transition of the hydrogels. Consequently, the aggregated hydrogel chain scattered the light passing through the film, reducing the optical transmittance.
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친수성/소수성 단량체 공중합을 통한 폴리(N-이소프로필아크릴아미드) 기반 열방성 스마트 윈도우 소재의 전이온도 조절
권미정(Meejeong Kwon),김도완(Dowan Kim),윤진환(Jinhwan Yoon) 한국고분자학회 2021 폴리머 Vol.45 No.5
Smart windows fabricated with thermotropic polymers can adaptively control the transmittance of the sunlight that enters the room, thereby reducing energy consumption for air conditioning. However, it is difficult to apply to various climatic environments for thermotropic smart windows based in poly(N-isopropylacryamide) (PNIPAm) due to the fixed transition temperature of 32 ℃. In this study, the transition temperature of PNIPAm based polymers could be controlled by copolymerization with the hydrophobic N,N-diethylacrylamide or the hydrophilic N-vinylpyrrolidone comonomers. We found that the transition temperature shifts to lower or higher temperatures ranging from 24-48 ℃ depending on the composition of copolymers through the controlof the interaction between copolymer and water. We further fabricated the smart window with prepared copolymers and confirmed that the optical transition of the windows occurs at various temperatures.
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