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Pulsed-DC 스퍼터링에서 Reverse pulse time 에 따른 AZO 박막의 특성 변화에 관한 연구
류형석,조진건,권상직,조의식 한국반도체디스플레이기술학회 2018 반도체디스플레이기술학회지 Vol.17 No.4
For various oxygen(O2) to argon(Ar) gas ratio, aluminum-doped zinc oxide(AZO) films were deposited for 3 min at different duty ratio by changing reverse pulse times. As the duty ratio increased, the thickness of the AZO film decreased and the sheet resistance increased. It can be concluded that When sputtering AZO Thin film, oxygen interfered with sputtering.When the reverse time was increased, the thickness of AZO was proportional to the real sputtering time and decreased. From the optical transmittance and sheet resistance, it was possible to obtain a higher figure of merits of AZO at a lower reverse pulse time. Even at the short reversed pulse time, it can be concluded that the accumulated charges on the AZO target are completely cleared.At a lower reverse pulse time, pulsed-DC sputtering of AZO is expected to be used instead of DC sputtering in the deposition of transparent conductive oxide(TCO) films without any degradation in thickness and structural/electrical characteristics.
류형석,Roshith Roshan,김문일,김동우,셀바라지,박대원 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
Zeolitic imidazolate framework ZIF-23 was prepared and used as catalyst for the solventless synthesis of cyclic carbonate from CO2 and propylene oxide with or without TBAB co-catalyst. ZIF-23 catalysts were prepared by a solvothermal or microwave method and they were characterized by various physicochemical techniques such as XRD, FT-IR, BET, TGA, and FE-SEM. The effects of reaction parameters such as temperature, reaction time, CO2 pressure, and co-catalyst on the reactivity of catalyst were investigated. ZIF-23 was recyclable up to four times without any considerable loss of its initial activity. Reaction mechanism containing the role of ZIF-23 with TBAB co-catalyst was also proposed.
Effect of Nd:YVO4 laser beam direction on direct patterning of indium tin oxide film
류형석,이동현,권상직,조의식 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.3
A Q-switched diode-pumped neodymium-doped yttrium vanadate (Nd:YVO4 , λ=1064 nm) laser was used for the direct patterning of indium tin oxide (ITO) films on glass substrate. During the laser direct patterning, the laser beam was incident on the two different directions of glass substrate and the laser ablated patterns were compared and analyzed. At a low scanning speed of laser beam, the larger laser etched lines were obtained by laser beam incident in reverse side of glass substrate. On the contrary, at a higher scanning speed, the larger etched pattern sizes were found in case of the beam incidence from front side of glass substrate. Furthermore, it was impossible to find no ablated patterns in some laser beam conditions for the laser beam from reverse side at a much higher scanning speed and repetition rate of laser beam. The laser beam is expected to be transferred and scattered through the glass substrate and the laser beam energy is thought to be also dispersed and much more influenced by the overlapping of each laser beam spot.
주택재개발사업의 갈등이 사업성에 미치는 영향 예측과 대응 전략
류형석(Ryu, Hyoung-Suk),정순오(Chung, Soon-Oh) 한국지역개발학회 2011 韓國地域開發學會誌 Vol.23 No.4
Housing redevelopment is one of important issues in urban regeneration practice. Non Capital metropolitan cities of Korea have been faced a lot of its difficulties through conflict between union leaders and participants, bankrupt crisis by sale slump, and corruptions among union, project managing company and construction company, etc. The paper analyzes systematically various problems around urban housing redevelopment project through preceding studies research and applies the Swedish TAIDA scenario technique to a case study in Daejon city to forecast profit impact of housing union inside conflict and find its resolving strategies. Two agenda appear as very urgent things; the one for conflict resolution and the other one for efficient marketing through resonable sale price and project period shortening. By TAIDA, the case study seems to have no alternative but to end the project within at least 3 years to get the second best.