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6 시그마를 활용한 PC 상가우수점 노트PC 판매비중 개선 사례
하승수(Ha, Seung-Su),안영수(Ahn, Yong-Soo),황인극(Hwang In Keuk) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-
일반적으로 6 시그마 적용사례는 제조분야 중심으로 연구 발표되는 경우가 많고, 판매나 마케팅 분야 의 적용사례는 찾기 힘들실정이다. 본 논문에서는 S전자의 전문상가에서 판매되는 노트북의 판매비중 을 높이기 위해 6 시그마를 적용하여 노트북의 판매비중을 높이기 위해 프로젝트를 진행하였다.
입자크기와 열처리 분위기 변화에 따른 Y-TZP에서의 상안정성 변화
정태주,안승수,송은화,오경식,이종숙,김영식,Chung, Tai-Joo,Ahn, Seung-Su,Song, Eun-Wha,Oh, Kyung-Sik,Lee, Jong-Sook,Kim, Young-Sik 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.5
The phase stability of tetragonal phase in Y-TZP was investigated in terms of the distribution of grain sizes and heat-treating atmosphere. Y-TZP with various grain sizes were prepared using duration time at $1600^{\circ}C$ as experimental parameter. Accumulated grain size distributions were built from the SEM micrographs and the amount of tetragonal phase were measured using XRD. Both results were compared to determine the critical grain size before and after heat-treatment in vacuum. The critical grain size drastically decreased compared with the small increase of average grain size due to the autocatalytic effect which critically affects the tetragonal to monoclinic phase transformation. After heat-treatment in reductive atmosphere critical grain size relatively increased due to the stabilization of tetragonal phase. The formation of oxygen vacancies during heat-treatment was ascribed to the increase of stability.
WC 첨가 방법에 따른 Ti(CN)-Co/Ni 계 서멧트의 미세조직 및 특성변화
정태주,안선용,안승수,신명수,김학규,김경배,오경식,이혁재,Chung, Tai-Joo,Ahn, Sun-Yong,Ahn, Seung-Su,Shin, Myung-Soo,Kim, Hak-Kyu,Kim, Kyung-Bae,Oh, Kyung-Sik,Lee, Hyuk-Jae 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.2
In the Ti(CN)-Co/Ni cermet, WC is an effective additive for increasing sinterability and mechanical properties such as toughness and hardness. In this work, WC, (WTi)C and (WTi)(CN) were used as the source of WC and their effects were investigated in the respect of microstructural evolution and mechanical properties. Regardless of the kinds of WC sources, the hard phase with dark core and bright rim structure was observed in the Ti(CN)-Co/Ni cermet under the incorporation of relatively small amount of WC. However, hard phases with bright core began to appear and their frequency increased with the increase of all kinds of WC source addition. The ratio of bright core to dark one in the (TiW)(CN)-Co/Ni cermet was greatest under the incorporation of (WTi)C compared at the same equivalent amount of WC. The mechanical properties were improved with the addition of WC irrespective of the kinds of sources, but the addition of (WTi)(CN) was less effective for the increase of fracture toughness.