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D.C. 마그네트론 스퍼터링법으로 제조한 ITO 및 ITO/Ag/ITO 박막의 미세조직과 투명 전극 특성
최용락,김선화,Choi, Yong-Lak,Kim, Seon-Hwa 한국재료학회 2006 한국재료학회지 Vol.16 No.8
ITO monolayer and ITO/Ag/ITO multilayer thin films are prepared by D.C. magnetron sputtering method. Ag layer was inserted for applying ITO to a flexible substrate at low temperature. Carrier concentration and carrier mobility of ITO and ITO/Ag/ITO thin films were measured, the transmittance of them also was done. The amorphous phase was confirmed to be combined in addition to (400) and (440) peaks from XRD result of ITO thin film. As the substrate temperature increased, the preferred orientation of (400) appeared. From the result of application of Ag layer at room temperature, the growth of columnar structure was inhibited, and the amorphous phase formed mostly. The ITO/Ag/ITO thin film represented the transmittance of above 80% when the thickness of Ag layer was 50 ${\AA}$, and the concentration of carrier increased up to above 10 times than that of ITO thin film. Finally, since very low resistance of 3.9${\Omega}/{\square}$ was observed, the effective application of low temperature process is expected to be possible for ITO thin film.
Sr과 TiB 첨가에 따른 다이캐스팅용 Al-Si 합금의 미세조직과 공정온도의 변화
최용락,김선화,김동현,윤상일,김기선,Choi, Yong-Lak,Kim, Seon-Hwa,Kim, Dong-Hyun,Yoon, Sang-Il,Kim, Ki-Sun 한국재료학회 2017 한국재료학회지 Vol.27 No.10
In order to develop a new commercial Al-12%Si casting alloy with improved physical properties, we investigated the effect of adding Sr and TiB to the alloy. Al-12%Si alloys were prepared by die casting at $660^{\circ}C$. The eutectic temperature of the Sr-modified Al-12%Si alloy decreased to $9^{\circ}C$ and the mushy zone region increased. The shape of the Si phase changed from coarse acicula to fine fiber with the addition of Sr. The addition of TiB in the Al-12%Si alloy reduced the size of the primary ${\alpha}$-Al and eutectic Si phases. When Sr and TiB were added together, it worked more effectively in refinement and modification. The density of twins in the Si phase-doped Sr increased and the width of the twins was refined to 5 nm. These results are related to the impurity induced twinning(IIT) growth.
산림경영의 3차 산업화를 위한 휴양림 이용자 추정모형 - 전라북도를 중심으로 -
최용락 ( Yong-lak Choi ),박희정 ( Hee-jung Park ),이상현 ( Sang-hyun Lee ) 전북대학교 농업과학기술연구소 2016 농업생명과학연구 Vol.47 No.1
The purpose of this study is to provide information for reasonable management of recreational forests in Jeollabuk-do by responding to the social needs for various functions of forest and to find ways of vitalizing and maximizing public values of forests. Annual visitors in the future were predicted using Gompertz marginal models based on the visitors statistics of recreational forests in Jeollabuk-do and its inter-temporal characteristics. As the result of this study, visitors were in constant rising tendency, expecting 624,028 visitors in 2015, 852,148 visitors in 2020 and 1,034,644 visitors in 2024. These result suggests that supported by increasing visitors, operation of various kinds of programs relating history, culture and education should be introduced. Also the goal of invigoration of forestry activities could be answered by solving the problem of small-sized ownership of private-owned forests through continuous management on recreational forests, tertiary industrialization of forest management, effective utilization of public values and positive governmental supports.
D.C. 마그네트론 스퍼터법으로 제조한 ITO 박막의 미세조직과 투명 전극 특성 변화에 관한 연구(1)
최용락 ( Yong Lak Choi ),김선화 ( Seon Hwa Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.8
ITO thin films were deposited on corning 1737 glass using a D.C. magnetron sputtering. The morphology, the crystallinity and the electrical properties of ITO thin films were investigated by XRD, FESEM and 4 point probe system. The morphology of ITO particles changed from round island to polygonal shape as the O2 flow rate increased. In the first stage of the growth of ITO thin films, amorphous phase occurred. As O2 flow rate increased, ITO thin film grew to the crystalline with preferred orientation of (400) and (440). The sheet resistance of ITO thin films decreased to 9Ω/_ when the substrate temperature was 350℃. In this study, preferred orientation of (400) and coarse island particle of ITO thin films were critical factor.
최용락(Yong-Lak Choi),서완석(Wan-Seok Seo),성형모(Hyung-Mo Sung),구본훈(Bon-Hoon Koo),김경근(Kyung-Keun Kim),김소연(So-Yeun Kim),최소정(So-Jeong Choi),이종훈(Jong-Hun Lee) 대한생물치료정신의학회 2009 생물치료정신의학 Vol.15 No.1
Objectives:This study was conducted to investigate various social and environmental factors related to children’s sleep and to know how these factors may affect sleep duration and patterns. Methods:Total 2,958 students of three elementary school in Daegu, Korea were enrolled in this study. We investigated various factors related to children’s sleep using Sleep questionnaires for Korean Children(SKC) for two days. The factors that we investigated were classified into sleep-related factors, daily life factors, environmental factors. We also evaluated correlations between these factors and children’s sleep duration. Results:When identifying various factors related to children’s sleep in three elementary school groups, group A showed significantly later bedtime(F=103.683, p<.001), longer sleep latency(F=6.30, p<.05), shorter total sleep duration(F=5.93, p<.05), and shorter nap duration(F=141.94, p<.001) compared to other group B and C. Also, group A showed significantly earlier time of returning home(F=71.073, p<.001), shorter amount of TV viewing (F=108.45, p<.001), earlier time of stopping TV viewing(F=24.01, p<.001), shorter amount of computer use(F=67.10, p<.001), earlier time of attending school(F=5.40, p<.05), longer hours in private institute(F=15.57, p<.001), smaller number of family(F=11.00, p<.001), longer father’s years of education(F=311.82, p<.001), and longer mother’s years of education(F=334.87, p<.001) compared to other two groups. Conclusion:Group A was associated with late bedtime, long sleep latency, short total sleep duration despite relatively short nap duration, short amount of TV viewing, short amount of computer use, early time of stopping TV viewing, small number of family, long mother’s years of education. This result suggests that total amount of hours in private institute and parents’ academic demands might be a contributing factor for children’s sleep duration.