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ZnO의 화학구동력에 의한 $MgAl_2O_4$의 입계이동
최균,조의성,강석중,Choi, Kyoon,Cho, Eu-Seong,Kang, Suk-Joong 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.11
The chemically induced grain-boundary migration has been studied in MgAl2O4 spinel under ZnO atmosphere. MgAl2O4 compacts been prepared by sintering powder mixture of Al2O3 and MgO at 1$600^{\circ}C$ for 60 h in air. The sintered MgAl2O4 has been heat-treated at 150$0^{\circ}C$ in a ZnO atmosphere. During the heat-treatment grain boundaries have become curved or faceted, and the total area of grain boundaries have increased. In the migrated region, the ZnO content is higher by 6 wt% than that in other regions, indicating that the migration was induced by addition of ZnO. In some shrinking grains, the faceted planes of different grain boundaries for the same grain are parallel to each other. This result provide an experimental support for the coherency strain energy in diffusion layer of the shrinking grain as being the major driving force. Calculated coherency strain energy of MgAl2O4 shows the maximum at {111} planes and the minimum at {100} planes. Although the minimum surface energy is at {111} planes, the faceted moving boundaries are expected to be {100} planes because of lowest driving force for the grain-boundary migration.
열필라멘트 CVD에서 전압 인가에 의한 다이아몬드의 핵생성 촉진
최균,강석중,황농문,Choi, Kyoon,Kang, Suk-Joong L.,Hwang, Nong-M. 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.6
The effect of various processing parameters, in particular the substrate and filament temperature, on the nucleation of diamond has been studied for the hot filament CVD process with a negative bias on the substrate. As far as the substrate temperature was maintained around the critical temperature of 73$0^{\circ}C$, the nucleation of diamond increased with increasing filament temperature. The maximum nucleation density of ~ 2$\times$109/$\textrm{cm}^2$ was obtained under the condition of filament temperature of 230$0^{\circ}C$, substrate temperature of 75$0^{\circ}C$, bias voltage of 300V, methane concentration of 20%, and deposition time of 2 hours. This nucleation density is about the same as those obtained in previous investigations. For fixed substrate temperatures, the nucleation density varies up to about 103 times depending on experimental conditions. This result is different from that of Reinke, et al. When the substrate temperature was above 80$0^{\circ}C$, a silkworm~shaped carbon phase was co-deposited with hemispherical microcrystalline diamond, and its amount increased with increasing substrate temperature. The Raman spectrum of the silkworm-shaped carbon was the same as that of graphitic soot. The silkworm-shaped carbon was etched and disappeared under the same as that of graphitic soot. The silkworm-shaped carbon was etched and disappeared under the deposition condition of diamond, implying that it did not affect the nucleation of diamond.
RF 마그네트론 스퍼터링을 이용한 태양전지용 질화 실리콘 반사방지막
최균,최의석,황진하,이수홍,Choi, Kyoon,Choi, Eui-Seok,Hwang, Jin-Ha,Lee, Soo-Hong 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.10
Silicon nitride films for an anti-reflection coating were deposited on silicon via RF magnetron sputtering using a $Si_3N4$ target. The best result was obtained at the sputtering condition of 340 W RF power, 5 mtorr Ar atmosphere, $100^{\circ}C$ substrate temperature. The films showed 7.9% reflectance minimum with 2.35 refractive index. 0.21 absorption coefficient at 66.6 nm thickness. The surface morphology showed a smooth and dense film with good adhesion to silicon surface.
최균(Choi, Gyun),장영신(Jang, Young-Shin) 한국지역사회복지학회 2013 한국지역사회복지학 Vol.0 No.45
본 연구에서는 지역복지 네트워크 이론인 사회교환이론, 상호조직이론, 사회자본이론을 중심으로 평택시 사회복지협의회와 남양주시 지역사회복지협의체를 분석하고, 지역복지 네트워크 활성화를 위한 정책적 방안을 제시를 하였다. 이를 위해 평택시 사회복지협의회와 남양주시 지역사회복지협의체의 지역복지 네트워크 모델을 비교했다. 분석결과에 의한 지역복지 네트워크 모델은 평택시 사회복지협의회의 경우, 상호조직이론과 사회자본이론을 중심으로 활용한 지역복지 네트워크 모델이고, 남양주시 지역복지협의체는 사회교환이론을 중심으로 활용한 지역복지 네트워크 모델로 나타났다. 따라서 지역복지 네트워크 활성화 방안으로 시 군 구사회복지협의회와 지역사회복지협의체의 기능 강화, 시군 구사회복지협의회 확대설치, 지역사회복지협의체의 조직운영 강화 등을 제언했다. The purpose of this study is to compare with community welfare network models and to suggest what is the best way to activate community welfare network. This study made analysis and comparison of roles and functions between Pyeongtaek Council of Social Welfare(PCSW) and Namyangju Community Welfare Council(NCWC) based on social exchange theory, interaction organization theory, social capital theory. As a result, PCSW"s medel was found that had more elements of interaction organization theory and social capital theory, NCWC" model had more elements of social exchange theory. It is necessary to activate the community welfare network that empowerment of Local Council of Social Welfare and Community Welfare Council, establishment of Local Council of Social Welfare, and reinforcement of ability of organizational operation at Community Welfare Council should be performed successfully.
최균(Choi Gy),서병수(Suh Byung-Soo),권종희(Kwon Jong-Hee) 한국사회복지학회 2011 한국사회복지학 Vol.63 No.1
다차원적 빈곤접근에 있어 빈자의 구분방식에는 복합지수방식, 합집합 및 교집합방식이 있는데 이들 방식들은 타당하지 않은 문제들이 있었다. Alkire와 Foster는 이 문제를 해소하는 방법으로 합집합과 교집합의 중간 형태로서 결핍차원들의 개수를 경계선으로 이용하는 차원계수방식을 이론화하였다. 차원계수방식에 의해 우리나라의 다차원적 빈곤을 측정한 결과, 3개 결핍차원을 정책적 차원빈곤선으로 하는 경우 다차원적 빈곤율은 20% 수준으로서 10명 중 2명이 다차원적으로 빈곤하였다. 다차원적 빈곤율이 높은 것은 자산, 소득, 사회보장, 건강 등 여러 차원으로 결핍의 폭이 넓은데 기인하였다. 여성, 한 부모, 노인, 비경제활동인구 등 취약계층일수록 다차원 빈곤의 폭이 넓고 가중되고 있었다. 연구결과 현행 기초생활보장제도가 탈 빈곤유도와 기초생활보장이라는 두 가지 정책목표를 각각 효과적으로 달성하기 위해서는 근로능력 유무에 따라 수급자선정과 지원체제를 이원화하고 차원계수방식을 적용하는 것이 유용하다고 본다. This study has the purpose to measure the multidimensional poverty in Korea by the counting approach which was theorized by Alkire and Foster to overcome problems of unidimensional approach, union method and intersection method for the identification of the multidimensional poor. By the counting approach applying to Welfare Panel in Korea during 2006-2008 , the head-count ratio of the multidimensional poverty was measured. When 3 dimensions are applied as a dimension poverty line, the multidimensional poverty rate was 20% in 2008. It was due to broad deprivations in assets, social securities, income and health. Vulnerable classes such as single parent families, low-education level group, the aged, economically non-active population were among the severe poverty rates, which were reaching around 50%. The analysis reveals the possible alternative to change the present public assistance program to the robust approach of multidimensional poverty measurement, the counting approach. Social policies to reduce poverty in Korea would gain expected positive outcome with the various approaches based on the concepts of multidimensional poverty.
폴리실리콘용 유동층 반응기에서 탄화규소의 내구성과 적합성 연구
최균(Kyoon Choi),서진원(Jin Won Seo),한윤수(Yoon Soo Hahn),손민수(Min Soo Son) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.6
In order to utilize silicon carbide (SiC) as an inner part of fluidized bed reactor (FBR) for manufacturing poly-silicon, we have carried out the thermodynamic calculation on the overall reactions including poly-silicon synthesis and compatibility of SiC with FBR process. The resources of silicon included SiH₄(MS), SiHCl₃(TCS) and SiCl₄(STC) and the thermodynamic yield of the FBR with MS, TCS and STC were compared each other with variable range of temperature, pressure and hydrogen to silicon ratio. The silicon yield of MS, TCS and STC were 100%, 28% and 4%, respectively, throughout the conventional FBR conditions. Silicon carbide having high hardness and strength showed strong resistance to granule collisions during the FBR process using a lab-scale reactor. And it also showed quite good compatibility with the typical FBR processes of MS and TCS resources.