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안중호,장민규,Ahn, Jung-Ho,Jang, Min-Kyu 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.3
Carbon nanotube (CNT)/$Mg_2Ni$ composites were synthesized to enhance the hydrogen storage properties. The emphasis was made on the effect of different shortening methods of CNTs on the open-tip structure and the resulting properties. The use of open CNTs as a starting material resulted in an enhanced hydrogen properties of CNT/$Mg_2Ni$ composites. Among the employed methods for the shortening of CNTs, wet milling using ethanol was the most efficient, while ultrasonic acid treatment or thermal decomposition resulted in a less hydrogen storage capacity.
고액 공존영역 온도 열처리에 의한 Al-Si 합금의 초정 구형화
안중호,송인혁,한유동 ( Jung Ho Ahn,In Hyuk Song,Yoo Dong Hahn ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.6
N/A In the present work, we have investigated the strain-induced melt activation (SIMA) process in Al-8%Si and Al-25%Si alloys. Primary dendrites were transformed into spherical microstrctures by mushy zone heat treatments of the cold-worked alloys., Various processing parameters which govern the sphering of the dendrites have been examined. The result showed that semi-solid alloys having a typically nondendritic spherical microstructure can be easily produced by this method.
안중호,이상현,김용진,정형식,Ahn, Jung-Ho,Lee, Sang-Hyun,Kim, Yong-Jin,Chung, Byung-Sik 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.5
Amorphous carbon nanotubes were synthesized by a reaction of benzene, ferrocene and Na mixture in a small autoclave at temperatures as low as $400^{\circ}C$. The resulting carbon nanotubes were short and straight, but their inner hole was filled with residual products. The addition of quartz to the reacting mixture considerably promoted the formation of carbon nanotubes. A careful examination of powder structure suggested that the nanotubes in this process were mainly formed by surface diffusion of carbon atoms at the surface of solid catalytic particles, not by VLS(vapor-liquid-solid) mechanism.
탄소 및 탄소화합물이 도핑된 $MgB_2$ 초전도체의 볼밀링 효과
안중호,장민규,오상준,Ahn, Jung-Ho,Jang, Min-Kyu,Oh, Sang-Jun 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
We have examined the effect of ball-milling on the superconducting properties of $MgB_2$ doped with C. The ball-milling of pre-reacted $MgB_2$ powder was carried out in dry or wet state using C or diethylenetriamine ($C_{4}H_{13}N_3$) as additives. The diethylenetriamine, whose chemical formula contains no oxygen, was chosen to avoid an excess oxidation during doping. The superconducting transition temperature (Tc) of the ball-milled or doped $MgB_2$ powders was only slightly smaller than that of undoped $MgB_2$. The critical current density (Jc) of the highly ball-milled $MgB_2$ was higher than that of C-doped $MgB_2$. The addition of diethylenetriamine was detrimental to Jc, although Tc was almost unchanged.
안중호(Jung-Ho Ahn),김윤호(Yoon-Ho Kim) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
최근 스마트폰과 지능형 차량의 발전과 함께 차량관리 애플리케이션이 부각되고 있다. 기존 차량 애플리케이션은 사용자와 차량 정비업체간의 수동적인 정보전달의 문제점을 가지고 있다. 이에 본 논문에서는 수동적인 정보전달의 문제점을 개선한 능동적 애플리케이션을 제안하고 ECU 시스템을 이용하여 차량정보를 사용자의 스마트폰으로 전송한 후 전송된 정보를 사용자와 차량 정비업체에서 공유하는 능동적인 차량관리 애플리케이션을 구현하였다.