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알루미나입자로 강화된 알루미늄합금 복합재료의 미세조직과 기계적 성질
오창섭,한창석,Oh, Chang-Sup,Han, Chang-Suk 한국재료학회 2013 한국재료학회지 Vol.23 No.3
The mechanical properties and microstructures of aluminum-matrix composites fabricated by the dispersion of fine alumina particles less than $20{\mu}m$ in size into 6061 aluminum alloys are investigated in this study. In the as-quenched state, the yield stress of the composite is 40~85 MPa higher than that of the 6061 alloy. This difference is attributed to the high density of dislocations within the matrix introduced due to the difference in the thermal expansion coefficients between the matrix and the reinforcement. The difference in the yield stress between the composite and the 6061 alloy decreases with the aging time and the age-hardening curves of both materials show a similar trend. At room temperature, the strain-hardening rate of the composite is higher than that of the 6061 alloy, most likely because the distribution of reinforcements enhances the dislocation density during deformation. Both the yield stress and the strain-hardening rate of the T6-treated composite decrease as the testing temperature increases, and the rate of decrease is faster in the composite than in the 6061 alloy. Under creep conditions, the stress exponents of the T6-treated composite vary from 8.3 at 473 K to 4.8 at 623 K. These exponents are larger than those of the 6061 matrix alloy.
걷고 싶은 거리(간판문화 개선)를 위한 경주시의 제도개선 과제
오창섭 경주지역발전협의회 부설 경주발전연구원 2007 경주연구 Vol.16 No.-
Recently the age of localization, is an age of competition between local governments, and city design. It has an influence upon city competition. In effect, Image of the city acts on as major a factor. Gyeongju, as a historic city, has to upgrade itself to an elegant city, not only in dignity or image but also in establishing brand identification while maintaining its natural features. Because this induces a ripple effect on regional economy development such as an increse in the number of tourists. Therefore the importance of the enhancement of city's image, a street walk and a signboard improvement cannot be overemphasized. On this point, this study focuses on the analysis of the view of a city and outdoor advertising system of five excellent local goverments and recommands to suggest effictive ways of administration and elevation of quality level in Gyeong-ju in order to make a street walk and a signboard culture improvement.
오창섭 경주지역발전협의회 부설 경주발전연구원 2006 경주연구 Vol.15 No.-
Local churches should share their fates with Community. They have to realize responsibility for not only the poor and the underprivileged but also envirmonment, culture, economy, politics, education. It is important to examine carefully what Churches should do to resolve Social polarization in terms of revitalization of local social welfare. Therefore this study examines the overall realities of church welfare participation focucing on 'the churches which won awards under the heading of church in the community" and the churches in Gyoung-Ju. and realizes changes in the Community and searches model and role of the churches which are required in the polarized society.