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RISS 인기검색어
- 검색키워드
- 저자 : Sang Kyu Rark (검색결과 2 건)
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Han, Jeong-In,Lee, Chan-Jae,Rark, Sung-Kyu,Kim, Won-Keun,Kwak, Min-GI The Korean Infomation Display Society 2001 Journal of information display Vol.2 No.2
The electrical and mechanical properties in indium-tin-oxide films deposited on polymer substrate were examined. The materials of substrates were polyethersulfone (PES) which have gas barrier layer and anti-glare coating for plastic-based devices. The experiments were performed by rf-magnetron sputtering using a special instrument and buffer layers. Therefore, we obtained a very flat polymer substrate deposited ITO film and investigated the effects of buffer layers, and the instrument. Moreover, the influences of an oxygen partial pressure and post-deposition annealing in ITO films deposited on polymer substrates were clarified. X-ray diffraction observation, measurement of electrical property, and optical microscope observation were performed for the investigation of micro-structure and electro-mechanical properties, and they indicated that as-deposited ITO thin films are amorphous and become quasi-crystalline after adjusting oxygen partial pressure and thermal annealing above $180^{\circ}C$. As a result, we obtained 20-25 ${\Omega}/sq$ of ITO films with good transmittance (above 80 %) of oxygen contents with under 0.2 % and vacuum annealing. Furthermore, using organic buffer layer, we obtained ITO films which have a rather high electrical resistance (40-45 ${\Omega}/sq$) but have improved optical (more than 85 %) and mechanical characteristics compared to the counterparts. Consequently, a prototype reflective color plastic film LCD was fabricated using the PES polymer substrates to confirm whether the ITO films could be realized in accordance with our experimental results.
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팔당호 연안대에서 저토와 수체에 대한 대형수생식물의 반작용
조강현,박상규,김준호 ( Kang Hyun Cho,Sang Kyu Rark,Joon Ho Kim ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.1
To verify influences of macrophytes on sediment and water in the littoral zone, physicochemical characteristics of sediment and root biomass at the clipped and the vegetated plots of stands of Typha angustifolia and Zizania latifolia, and water chemistry along a transect from the shore toward pelagic zone were studies in Lake Paltangho. The upper sediment of the vegetated site with large root biomass showed more oxidative condition, less NH_4^+-N, and less available nitrogen and phosphorus measured by ion exchange resin bag method than those of the clipped site. Electric conductivity(EC) and NH_4^+-N concentration of the water were lower in the littoral zone of submersed macrophytes than those in the pelagic zone during the growing season. EC and concentrations of inorganic nitrogen and potassium of water were lower at the stand of Z.latifolia than those in the pelagic zone during its growing season. During the declining season, however, EC and concentration of inorganic nutrients were higher in the littoral zone than those in the pelagic zone. Therefore, chemical characteristics of sediment and water were changed with the growth stages of macrophytes in the littoral zone of Lake Paltangho.
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