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문화콘텐츠 상품 확산의 시,공간적 특성-싸이의 “강남스타일” 뮤직비디오를 중심으로-
이금숙 ( Kwum Sook Lee ),김호성 ( Ho Sung Kim ) 한국경제지리학회 2015 한국경제지리학회지 Vol.18 No.2
This study investigates the time-space characteristics of the consumptions of cultural-contents commodities and their spatial diffusion progresses via digital media. For the purpose, we examine the spatial diffusion patterns of PSY’s Music Video “Gangnam Style” since it has been launched on the YouTube. By visualizing the spacio-temporal progresses of YouTube, Tweet, and Google searching data during four months after launching, we examine the time-space characteristics of diffusion patterns of the music video via each media. We found that the adapting time and the diffusion progress were not in accordance at each country. The results revel that cultural distance such as characterized by language, cultural linkage, exclusivism or courtesy for the ‘Hanrue’ affects quite strongly on the spatial diffusion of music video rather than physical distance.
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플라즈마 이온질화한 SACM645 강의 미세조직 및 피로균열 발생의 해석
김경태,권숙인 ( K . T . Kim,S . I . Kwum ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.1
The fatigue crack initiation behavior of plasma ion nitrided SACM645 steel was investigated through the rotary bending fatigue test and residual stress measurement by XRD. It was shown by XRD and EPMA that the plasma ion nitrided surface was composed of γ`(Fe₄N)phase and ε(Fe_(2-3)N)phase, and that the nitrogen atoms existed in Fe matrix in diffusion layer. The OM. SEM and Auger spectroscopy showed that the depth of compound layer, mixed compound and diffusion layer, and diffusion layer was 8㎛, 30㎛ and 300㎛, respectively. However, the microhardness test showed that the depth of hardened layer was 500㎛. The tensile strength of the ion nitrided SACM645 was lower than that of the unnitrided SACM645, and the ion nitrided specimen was fractured without plastic deformation. The nitrided SACM645 showed much poorer low cycle fatigue properties than the unnitrided one. In rotary bending fatigue, the fatigue strength of the ion nitrided SACM645 was higher than that of the unnitrided specimen, and the fatigue crack initiation sites changed by applied fatigue stress levels. The XRD result showed that the ion nitrided SACM645 has the compressive residual stress from surface to 600㎛ deep and the tensile residual stress from 600㎛ to deeper site. It is thought that crack initiation takes place at the point where the total stress of residual stress arid applied stress is maximum.
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