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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.
복지의식의 경향과 특징 : the duality of responsibility and commitment in social welfare 이중성
최균,류진석 한국사회복지연구회(서울대학교 사회복지연구소) 2000 사회복지연구 Vol.16 No.1
In this paper, we study the trend and characteristics of welfare consciousness in Korea. Welfare consciousness is related to values, attitudes, responsibility and commitment in social welfare. Especially, welfare consciousness may reflect collective attitudes towards welfare which learned socially beyond individual level. Using data from Social Welfare Institute Survey in Hanlim University, we investigate how, and to what extents, Korean people recognize welfare values, attitudes. And what are the characteristics of welfare consciousness? The major findings are as follows: First, welfare consciousness in value dimension is accepted both individualism and collectivism. Second, it can be argued that welfare consciousness in attitudes dimension are preferred for more universal social welfare, or more positive welfare attitudes like equality, right, reciprocity, etc. Third, welfare responsibility is identified state-friendly, but we find that the affordability of welfare cost is reluctant. The result of discrepancy between responsibility and commitment in social welfare shows the duality of welfare consciousness.