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인터넷 매체 이용 속성에 따른 항공상품의 온라인 마케팅
신승엽(Shin Seung yeub),유수연(Yoo Su yeon),서해영(Seo Hae young),정문식(Joung Moon sik) 한국유통학회 2009 한국유통학회 학술대회 발표논문집 Vol.2009 No.8
본 논문은 인터넷 사용자들의 매체 이용 속성에 따라 소비자를 세분화하여 구매 의사와의 상관관계 및 항공상품 선택 시 중요시 여기는 서비스 선호 기준간의 차이를 조사한다. 구체적으로 인터넷 매체 이용 속성에 따라 온라인 항공상품의 구매 의사에 유의한지 논의하고, 서비스 선호 기준에도 영향이 미치는지를 알아본다.
과공정 Al-Si-(Fe) 합금의 마멸특성에 미치는 정출상의 영향
김원태,나형용,최이식,서해영 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
It was known that the wear characteristics of hypereutectic Al-Si alloys are mainly affected by the size and the volume fraction of primary Si phases. However, the effects of the size and the volume fraction of primary Si phases on the wear characteristics was not yet clear. Thus these were investigated in this study, and the effect of Fe addition on the wear characteristics was also studied. The wear test was carried out with variations of load (30∼2OON) and sliding speed (0.2, 1, 2m/s) at a constant sliding distance(2000m) on a pin-on-disk type wear testing machine. As a result, the Al-20Si-5Fe alloy, which had the primary phases of medium size(20∼30㎛), had the highest wear-transition-load(200N at sliding speed of 1m/s). The reason was related to MML (Mechanically Mixed Layer). MML, which was formed on alloy's worn surface, had the higher hardness than the matrix and played a role as solid-lubricants. Therefore it seemed that the MML protected the matrix from contacting with counterface and held back the thermal softening of matrix by inhibiting the temperature rising of the surface. The MML of Al-20Si-5Fe, which had primary phases of 20∼30㎛, had the highest hardness and inhibited most effectively the temperature rising of the surface.