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김승철 한국인터넷전자상거래학회 2007 인터넷전자상거래연구 Vol.7 No.2
…The objective of this dissertation is to identify factors that influence the usage and performance of e-trade in Korean firms, and suggest schemes to help successful embodiment and introduction of e-trade in Korea. The factors proposed for this study consist of external firm factors(inter-firm relationship, consultant support), internal firm factors(organization characteristics : firm size, top management support, education-training, export characteristics : share of export to total sales, Technology characteristics : IT maturity), and perception factors(perceived benefit, perceived barriers). A Questionnaire was used to analysis the usage level and performance of e-trade. The analysis result revealed that external firm factors, perception factors are influential variables on the usage level of e-trade. Also, the factors that influenced the performance of e-trade are external firm factors, internal firm factors
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김승철,김정석,윤혁진 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
This paper studied the effect of the hybridization of carbon and Kevlar fibers on mode I interlaminar fracture toughness and crack propagation behaviors with double cantilever beam (DCB) tests. The crack propagation characteristics, crack growth trend and rate, and fracture surfaces were observed using an optical microscope and SEM micrographs for the three different types of materials. Moreover, details of the stress distribution around the crack tip and the crack propagation pattern across the width of the DCB specimen were investigated using the finite element method, including a cohesive element. The mode I interlaminar fracture toughness of carbon-Kevlar hybrid/epoxy was nearly average for carbon/epoxy and Kevlar/epoxy. The maximum load predicted by the numerical method showed good agreement within an error of 5%with the experimental results.
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