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SNCM 강종의 파인블랭킹 전단부의 변형거동에 관한 연구
이종구,Lee, Jong-Ku 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
The aim of this dissertation is inferring factors controlling the complex strain behavior of the material and the characteristics of the Fine-Blanking in the most narrow area at the shear zone where we are performing the Fine-Blanking. And also this is for inspecting and presenting their uses and the possibilities to make the results data based in order to utilize easily. Therefore, to analyze of shere zone's strain behaviour, the Fine-Blanking process need to be modelled defining the quadratic-nodded and axi-symmetrical elements as the problems of large deformation axi-symmetry and the non-linear contact. For the method of inputting strain-stress values of the material, the piece-wise linear technics were used, the Implicit-Finite Element method also used making balance of forces on each step by the long intervals, calculates and converges many times was done. The materials used for the analysis was the Steel SNCM220 5.5mm respectively. As the result of FEM analysis, we know that shear stress value in the beginning of punch penetration is distributed widely and done high both in the center of the late-thickness and on the both sides centering around shear strain zone as the punch penetration is increasing. Also.
이종구(Jong Ku Lee),김태진(Tae Jin Kim),권기헌(Gi Heon Kwon) 한국정부학회 2009 한국행정논집 Vol.21 No.4
본 연구는 전파자원관리 패러다임을 중심으로 우리나라 전파자원 관리정책의 내·외적 영향요인들에 대해 고찰하고 이들에 의해 전파자원 관리정책이 어떻게 변화하였는지를 살펴보고자 하였다. 이를 통해 미래 지향적 전파자원 관리정책 수립을 위한 시사점을 탐색하는 것을 연구 목적으로 하였다. 분석에 따르면 크게 3가지 시사점을 확인할 수 있었다. 첫째, 전파자원 배분체계의 정립이 요구된다. 즉, 전파자원의 할당·배분 단계에서의 정책 참여자의 명확한 역할명시를 통해 전파이용자들의 이해를 높이고, 전파자원관리의 합법성과 투명성 제고가 필요하다. 둘째, 시장기반 전파자원 관리제도의 확대적용이 요구된다. 이를 위해 주파수 경매제의 법적 근거마련과 세부 운영방안 수립을 위한 신중한 접근이 필요하다. 셋째, 국내전파산업의 부흥과 국외 전파시장에서의 경쟁력 확보를 위한 전파자원 핵심기술 개발에 대한 지속적인 노력이 요구된다. Focusing on spectrum resources management paradigm, this study considers the internal and external factors influencing management policy on spectrum resources, and examine the changes about management policy on spectrum resources by influence factors. Further, based on the results of analysis, the paper suggests the implications for the future-oriented policy making of spectrum resources. The implication may be summarized as follows. First, the government needs to establish clearly on distribution system of spectrum resources. Namely, at a allocation and distribution stage, through clear statement of policy participation`s role, it is necessary to raise the understanding capacity of spectrum user, and improve the lawfulness and transparency of spectrum resources` management. Second, the application of the market-based management policy of spectrum resources need to extend farther. For this, it is needed to make a legal basis of spectrum auction and more specific operation plan. Third, it is needed to make efforts to develop a core spectrum technology for rehabilitation of spectrum industry and get a competitive power in spectrum market.