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CV 흑연주철에서의 (黑鉛鑄鐵) 표면응고층 생성에 관한 연구
박기성,이상익,김수영 ( K . S . Park,S . I . Lee,S . Y . Kim ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.1
In order to investigate the solidification characteristics of CV. graphite cast iron, decantation technique and thermal analysis test were used. Solidification characteristics were studied in the specimens with various compositions and graphite shape. The results were as follows; 1. The first surface solidifcation layer is formed along the mold wall by the growth of austenite dendrites in hypoeutectic composition and thin solid film in hypereutectic composition. 2. The mushy degree of solidifcation of hypereutiectic composition is higher than that of hypoeutectic. 3. In hypoeutectic, the effect of change of the mushy degree of solidification on the graphite shape is small, however, in hypereutectic the mushy degree of solidification becomes higher in order of flake, CV, and spheroidal graphite cast iron.
韓國의 公營放送體制의 導入과 運營實態 : 1981∼1987
朴基成 경북대학교 1987 社會科學 Vol.6 No.-
Korea has adopted the public broadcasting system since 1981 to enhance the quality of broadcast programming and to make the system more liberal. Another manifest intention at that time was to preserve the civil right of expression on the broadcast media and to lessen the government's intervention in the process of boradcast management. The evlauation that the Korean Public Broadcasting System has resulted in concludes that it is still at the phase of experimental era. Even the broadcasting stations endeavored to raise their broadcasting buality higher, they could not check the cultural needs of target audiences correctly for the development of programming.They are criticized not to have philosophy based on Korean people's spiritual common denominators. The purpose of this study is to review and reflect the practice of Korean Public Broadcasting System from 1981 to 1987. The inquiries are 1) What are the ideal characteristics of the public broadcasting system established in the Western societies?, 2) What kind of results emerged in Korean Public Broadcasting System?, and 3) What kind of policy does Korean Public Broadcasting System need to intensify and reinforce the broadcast management and programming? The policies to be amended are as follows: 1) Communicatiom by boradcasting media should be performed based on receiver-oriented message design to give fair opportunity for participation and reception. 2) Research function of Korean Broadcasting Commission should be widened and intensified to improve the broadcasting quality and to develop programming formats. 3) Elaboration of Korean Educational Broadcasting establishment is necessary for the nation's further education. 4) MBC should have its independent financial foundation separated from that of KBS.