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계면중합법에 의한 파라핀왁스의 마이크로캡슐화에 있어서 SDS 첨가량이 미치는 영향
신세순,정재윤,김영호,임명관,최동욱,Shin, Se-Soon,Jung, Jae-Yoon,Kim, Young-Ho,Lim, Myung-Kwan,Choi, Dong-Uk,Lee, Chin-Yong 한국건설순환자원학회 2012 한국건설순환자원학회지 Vol.7 No.1
이 연구에서는 건물의 사용에 있어서 잠열의 축열 성능을 이용하여 에너지를 절감할 수 있는 축열 건자재로서 멜라민 수지를 콘크리트 벽체 물질로 하는 파라핀 왁스의 마이크로 캡슐화를 통한 축열미립자의 제조에 관하여 연구하였다. 마이크로 캡슐화 공정에 있어서 계면활성제로서 SDS의 첨가량이 미치는 영향을 검토하였으며 제조된 축열미립자의 축열 성질을 비교하였다. SDS가 첨가됨에 따라서 마이크로캡슐화가 가능하였으며 첨가량이 증가함에 따라서 보다 단단한 캡슐이 형성되었다. 또한 적정 첨가량에서는 매우 균일한 재료가 형성되었다. 또한 SDS 첨가량은 제조된 축열 미립자의 축열 성질에도 영향을 크게 미쳤으며 첨가량이 증가할수록 왁스의 융점 온도에서 열 저장 및 방출 현상이 뚜렷히 관찰되었다. 이 연구는 건물의 사용 에너지 절감을 위해 마이크로 캡슐화된 PCM을 콘크리트 벽체에 적용하는 연구 시리즈의 일부이다. In this study, the manufacturing process of micro capsulized PCM (phase changing material) for thermal storage performance of latent heat was investigated to save energy during the use of buildings: i.e. use of melamine-type resin as the micro-capsule material and paraffin wax as the inner material that are together used in concrete walls. For the manufacturing process of the micro-capsulized PCM, the amount of SDS addition as surfactant was the key variable and the resulting thermal storage performance depended on the SDS amount. With increasing amount of SDS, the micro capsulation became much easier while the capsule surface became harder. The micro capsules became uniform at an optimum SDS addition. The addition of SDS also affected the thermal capacity: with increasing SDS amount, the heat storage and release tendency at melting point was more clearly manifested. The current investigation is part of a study under progress to explore the use of PCM in concrete walls to save building maintenance cost and energy.
저온 제작 다결정 실리콘 박막 트랜지스터의 off-current메카니즘에 관한 연구
진교원,김진,이진민,김동진,조봉희,김영호,Chin, Gyo-Won,Kim, Jin,Lee, Jin-Min,Kim, Dong-Jin,Cho, Bong-Hee,Kim, Young-Ho 한국전기전자재료학회 1996 電氣電子材料學會誌 Vol.9 No.10
The conduction mechanisms of the off-current in low temperature (.leq. >$600^{\circ}C$) processed polycrystalline silicon thin film transistors (LTP poly-Si TFT'S) have been systematically studied. Especially, the temperature and bias dependence of the off-current between hydrogenated and nonhydrogenated poly-Si TFT's were investigated and compared. The off-current of nonhydrogenated poly-Si TF's is because of a resistive current at low gate and drain voltage, thermally activated current at high gate and low drain voltage, and Poole-Frenkel emission current in the depletion region near the drain at high gate and drain voltage. After hydrogenation it has shown that the off -current mechanism is caused mainly by thermal activation and that the field-induced current component is suppressed.
콘크리트계 재료로 충전된 강관의 휨거동에 관한 실험적 연구
강재윤(Kang Jae-Yoon),김병석(Kim Byung-Suk),최은석(Choi Eun-Suk),진원종(Chin Won-Jong),이정우(Lee Jung-Woo),유성근(Yoo Sung-Keun),김영호(Kim Yong-Ho) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Thin-wailed steel pipes In bending are vulnerable against buckling caused by compressive stress. However. when It is filled with concrete. the resistance against buckling Increases and It comes to have high strength. high rigidity. and good ductility. This paper attempts to characterize the structural performance of steel-concrete composite system under flexural loading, And. the paper also describes experimental results on the bending behavior of concrete-filled tubular members with respect to parameters affects the ultimate strength and ductility. A simplified finite element model verified by the experimental results was used to carry out a parametric study, The test results and parametric study suggest that the contribution of concrete confinement to the ultimate strength and the ductility is significant.
콘크리트계 재료로 충전된 강관의 휨거동에 관한 실험적 연구
강재윤 ( Kang Jae-yoon ),김병석 ( Kim Byung-suk ),최은석 ( Choi Eun-suk ),진원종 ( Chin Won-jong ),이정우 ( Lee Jung-woo ),유성근 ( Yoo Sung-keun ),김영호 ( Kim Yong-ho ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Thin-walled steel pipes in bending are vulnerable against buckling caused by compressive stress. However, when it is filled with concrete, the resistance against buckling increases and it comes to have high strength, high rigidity, and good ductility. This paper attempts to characterize the structural performance of steel-concrete composite system under flexural loading. And, the paper also describes experimental results on the bending behavior of concrete-filled tubular members with respect to parameters affects the ultimate strength and ductility. A simplified finite element model verified by the experimental results was used to carry out a parametric study. The test results and parametric study suggest that the contribution of concrete confinement to the ultimate strength and the ductility is significant.