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레이저에 의한 Li$_2$O-A1$_2$O$_3$-SiO$_2$계 유리의 미세가공 및 광학적 특성
강원호 한국마이크로전자및패키징학회 2001 마이크로전자 및 패키징학회지 Vol.8 No.4
본 연구는 레이저 처리기술에 의한 $Li_2O-A1_2O_3-SiO_2$계 유리의 미세가공과 레이저에 의한 유리의 광활성반응에 관한 것으로서, 1064 nm와 355 nm의 파장을 갖는 Nd:YAG laser를 유리에 조사하여 유리의 파괴특성 및 광학적변화를 관찰하였다. 1064 nm레이저에 의한 유리의 파괴 부분은 광학현미경과 주사전자현미경 (SEM)으로서 파괴특성을 평가하였으며, 355 nm 레이저에 의한 유리의 변화는 흡수대역은 측정함으로서 그 광학적 특성을 나타내었다. 이와 같은 레이저에 의한 가공은 유리내부의 3차원적인 미세구조물 형성이나, internal waveguide, 또는 광 흡수대역의 변화에 따른 광기록방법으로 응용될 것으로 예상된다. For photosensitive and micro-structuring in $Li_2O-A1_2O_3-SiO_2$glasses by laser treatment, Nd:YAG laser in 355 nm and 1064 nm wavelength was irradiated to the glass to investigate fracture characterization and optical changes. The fractured glass surfaces irradiated by 1064 nm laser was observed by Scanning Electron Microscope(SEM) and optical microscope, and optical changes caused by 355 nm later was identified from absorption spectra. In this study, it could be expected that the laser treatment technology will be utilized for 3-dimensional micro-structure, internal waveguide, optical memory by optical absorption changes in glass matrix.
A Strategy for Supporting the Learning Community in Cooperation with Industry
강원호 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
Learning community is one of the important pillars of the education in knowledge-based society. How to lead students’spontaneous participation to the learning community is one of the actual problems to solve for the revolution of the education scheme. In this paper we introduce a strategy to boost the activity of the learning community, which works inthe on-line space. The keys for the on-line supporting system for the learning community are to have communication space,trading space and connection with industry. To support activities of each space, we provide an on-line web site which includes a community module, a knowledge market module and an industrial commentary module. Students can start theirself-leading study in the communication space, and they can also practice skills for the knowledge management in the knowledge trading space. Through the connection space, they can learn more from the real world critics with help of industry.
La3+ doped (Ba1-x Cax) TiO3의 PTCR 특성에 미치는 첨가제의 영향
강원호,오봉인,김재현,이경희 한국세라믹학회 1988 한국세라믹학회지 Vol.25 No.1
Commercially available PTCR (Postive Temperature Coefficient of Resistivity) ceramics which have low room temperature resistance, high PTC effect and temperature coefficient were prepared by La3+ doped semiconducting barium calcium titanate soild solutions. PTCR characteristics were remarkably improved by addition of AST (1/3 Al2O3$.$3/4SiO2$.$1/4TiO2) and MnCl2. That can be explained by formation of liquid phase during sintering and acceptor level on the intergranular layer. Resistivity anormaly increased with decreasing cooling rate. Optimum manufacturing conditions were cooling rate below 100$.$C/hr, Ca and Mn content of 4 mol% &, 0.09-0.12mol% respectively.
Ag₂O-Li₂O-CaO-TiO₂-P<sub>2</sub>O계의 다공성 글라스 세라믹스의 향균 특성
강원호,윤영진,이용수,홍범수,염곤,김창수,석만균 한국산학기술학회 2000 한국산학기술학회논문지 Vol.1 No.1
인산염계 Ag₂O · Li₂O · CaO · TiO₂ · P<sub>2</sub>O<sub>5</sub> 조성에 CuO 0.05-1.5 mole 첨가하여 다공성 글래스 세라믹스를 제조하였으며, 제조된 모유리는 최적 핵형성을 위해 610 ℃, 최고 결정성장을 위해 840 ℃에서 열처리하였다. IN-HCI에서 β-Ca₃(PO)₄결정상만을 선택적으로 용출하였으며 LiTi₂(PO₄)₃상과 AgTi₂(PO₄)₃ 결정상이 존재하는 Glass Ceramics릅 제조하였다. 다공성 글래스 세라믹스의 항균효과 및 특성을 평가하였다. Staphylococcus auerue와 Salmonella typhi 균이 본 연구에 사용되었으며. 락월한 항균효과을 나타내는 것으로 평가되었다. Porous glass ceramics composed of Ag₂O-Li₂O-TiO₂-P<sub>2</sub>O<sub>5</sub>-CaO with 0.05-1.5 mole CuO were prepared by melting and 2 step heat sreasment for nucleation at 610 ℃ and crystallization at 840 ℃. β-Ca₃(PO)₄ crystal phase was selectively leached out in IN-HCI solution for 3 days, Ieaving AgTi₂(PO₄)₃, and LiTi₂(PO₄)₃ crystal phases. Antibacterial effects and characterizations of the porous glass ceramics wore investigated. Stepbvlococcus aureus and Salmonella ty phi bacteria were used in tnis study. It was found that the resultant porous glass ceramics show excellent bacteriostatic properties.