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現代建築에서 나타나는 外皮의 複合的 意味體系에 관한 硏究
김도홍(Kim Do-Hong),김정곤(Kim Jung-Gon) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.7
Modern society has transformed into more complicated framework with the development of the new media and technology in the 21st Century. The surface design of building also has been changed in trend and material. The Purpose of this study is to analyze the tendency of the surface contemporary architecture and to prove its extended meaning. By researching the perception of surface, the notion of surface is revealed as non-representional boundary between inside and outside. It shows multiple meaning of surface which extends from physical boundary to recognizable one. Through this extended meaning of architectural surface, it is analyzed by the following four architects. Herzog & de Meuron, Toyo Ito, Rem koolhaas, FOA. As a result, it becomes apparent that despite dialectic effects of modern architecture and a condition of complicated modern city, the surface is a result of human sensible experience, and that the meaning of surface becomes rich not by fixed physical dry environment, but various experiments and a new exploration of architectural surface which sympathizes with surroundings.
선택적 가스 센서를 위한 Au 나노입자가 장식된 TiO2 나노튜브의 합성
김도홍 ( Do Hong Kim ),심영석 ( Young Seok Shim ),장호원 ( Ho Won Jang ) 한국센서학회 2014 센서학회지 Vol.23 No.5
Well-ordered TiO2 nanotubes with Au nanoparticles are a desirable configuration to enhance the gas sensing properties such as response and selectivity due to their high surface area to volume ratio and catalytic effect of Au nanoparticles. We have synthesized the well-ordered TiO2 nanotubes directly on a Pt IDEs patterned SiO2/Si substrate and then decorated Au nanoparticles on inner and outer surface of TiO2 nanotubes using electrodeposition method. The Au-decorated TiO2 nanotubes shows ultrahigh response to C2H5OH and the highest increasing ratio to H2 compared with other gases.
양극산화에 의한 나노다공성 TiO<sub>2</sub> 박막 생성
윤여준,김도홍,장호원,Yoon, Yeo-Jun,Kim, Do-Hong,Jang, Ho-Won 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8
Nanoporous titanium dioxide ($TiO_2$) is very attractive material for various applications due to the high surface to volume ratio. In this study, we have fabricated nanoporous $TiO_2$ thin films on Si by anodic oxidation. 500-nm-thick titanium (Ti) films were deposited on Si by using electron beam evaporation. Nanoporous structures in the Ti films were obtained by anodic oxidization using ethylene glycol electrolytes containing 0.3 wt% $NH_4F$ and 2 vol% $H_2O$ under an applied bias of 5 V. The diameter of nanopores in the Ti films linearly increased with anodization time and the whole Ti layer could become nanoporous after anodizing for 3 hours, resulting in vertically aligned nanotubes with the length of 200~300 nm and the diameter of 50~80 nm. Upon annealing at $600^{\circ}C$ in air, the anodized Ti films were fully crystallized to $TiO_2$ of rutile and anatase phases. We believe that our method to fabricate nanoporous $TiO_2$ films on Si is promising for applications to thin-film gas sensors and thin-film photovoltaics.
윤여준,김도홍,장호원 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8
Nanoporous titanium dioxide (TiO2) is very attractive material for various applications due to the high surface to volume ratio. In this study, we have fabricated nanoporous TiO2 thin films on Si by anodic oxidation. 500-nm-thick titanium (Ti) films were deposited on Si by using electron beam evaporation. Nanoporous structures in the Ti films were obtained by anodic oxidization using ethylene glycol electrolytes containing 0.3 wt% NH4F and 2 vol% H2O under an applied bias of 5 V. The diameter of nanopores in the Ti films linearly increased with anodization time and the whole Ti layer could become nanoporous after anodizing for 3 hours, resulting in vertically aligned nanotubes with the length of 200~300 nm and the diameter of 50~80 nm. Upon annealing at 600℃ in air, the anodized Ti films were fully crystallized to TiO2 of rutile and anatase phases. We believe that our method to fabricate nanoporous TiO2 films on Si is promising for applications to thin-film gas sensors and thin-film photovoltaics.
문희규,심영석,김도홍,류정호,김진상,박형호,박동수,윤석진,장호원,Moon, Hi-Gyu,Shim, Young-Seok,Kim, Do-Hong,Ryu, Jung-Ho,Kim, Jin-Sang,Park, Hyung-Ho,Park, Dong-Soo,Yoon, Seok-Jin,Jang, Ho-Won 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.8
Multifunctional structures with two kinds of materials have been intensively investigated in order to improve their electrical characteristic with two functions simultaneously. However, the research regarding of multifunctional ceramic sensor is still in a preliminary stage and how to integrate them with low-cost and high-yield mass production process remains a challenge issue. In this study, we fabricated the multifunctional ceramic sensor composed of temperature and gas sensors. Moreover, we investigated the CO sensing properties of three dimensional nanostuctured $Nb_2O_5$ thin film gas sensors fabricated with silica ($SiO_2$ nanosphere (${\O}$= 750 nm). Compared to plain films, the nanostructured films show enhanced gas sensing of greater sensitivity and a faster response. This result reveals that significantly increased sensitivity is an increase in the effective surface area for the adsorption of gas molecules.