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압출공정에 의한 수 처리용 평관형알루미나 필터의 미세구조와 특성평가
배병서,하장훈,송인혁,Bae, Byung-Seo,Ha, Jang-Hoon,Song, In-Hyuck 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
In this study, flat-tubular-type alumina filters were manufactured using alumina powder of two sizes ($2.4{\mu}m$ ALM-44 and $0.4{\mu}m$ AP 400) by an extrusion process. The manufactured alumina filter was sintered at $1200-1600^{\circ}C$ for 1 h. As particle size increased, the largest pore size, average pore size and porosity increased; but density and linear shrinkage decreased. The alumina filter fabricated using ALM-44 powder sintered at $1500^{\circ}C$ was confirmed as the best water treatment filter after investigation of the bending strength, water permeability and impurity-removal efficiency of the experimental filters. This flat-tubular-type alumina filter is expected to be useful not only for direct water treatment, but also for use as a support filter during coating processes, to control pore size.
실리카 분말이 코팅된 수처리용 규조토계 세라믹 필터의 특성평가
배병서,하장훈,송인혁,한유동,Bae, Byung-Seo,Ha, Jang-Hoon,Song, In-Hyuck,Hahn, Yoo-Dong 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.1
In this study, diatomite based materials were investigated as a support filter for silica particle coating. The silica sol for coating was synthesized by a st$\ddot{o}$ber process. The diatomite support was dry-pressed at 10 MPa and sintered at $1200^{\circ}C$ for 1 hour. The coating sol was prepared as a mixture of EtOH and silica sol. The diatomite support was coated by a dip-coating process. Silica coated diatomite filter was sintered at $1000{\sim}1200^{\circ}C$ for 1 hour. The largest pore size was decreased with increasing concentration ratio of coating sol. The gas and water permeability of silica coated diatomite decreased with increasing of concentration ratio of the coating sol.
배옹호(Yong-Ho Bae),황석원(Seogwon Hwang),정장훈(Jang Hoon Chung),정현주(Hyun-Ju Jung),김지수(Jisoo KIm),서병선(Byeongseon Seo),고명주(Myoung-Ju Koh) 과학기술정책연구원 2016 정책연구 Vol.- No.-
As the R&D capability of private sector increases, it is needed to change the role of the government from driving national R&D to supporting the private R&D. To rearrange the role of the government in R&D, this study focuses on analyzing R&D investment of the government and the private sector and tries to suggest policy implications. This research questions are as follows. 1) What is the optimal resource allocation between the governmnet and the private sector? 2) What are the effects of government R&D investment on private R&D investment? Are the effects of government R&D investment on the economic growth bigger than the private R&D investment? Is the government R&D investment crowding out the private R&D investment? 3) What are the effects of government R&D policy tools on private R&D investment? To answer these questions, we use the several analysis methodology such as portfolio analysis, econometric tools, survey of corporate recognition, and so on. Wrapping up the discussions, this research raised several policy implications. Firstly, the government has to raise up the efficiency of the government R&D. Secondly, the main areas of government R&D investment need to change from development technology to basic research. And the government has to try support small-meduim size enterprises(SMES), to make more highly vaule-added industry in our country. Thirdly, it is needed to change from the government led R&D system to market led R&D system. Fourthly, it is suggested the desirable technology innovation policies of the future growth engines.