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최만호(M. H. Choi),정상수(S. S. Jeong),김효윤(H. Y. Kim),김명진(M. J. Kim),이해철(H. C. Lee),한영진(Y. J. Han),최우천(W. C. Choi) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.3
본 논문은 포항가속기에서 건설 중인 진공 chamber의 용접에 관한 것이다. 저장링에 전자빔을 5시간 이상 저장하기 위하여 10^(-10)torr 이하로 진공도를 유지하도록 설계되어 있기 때문에 초고진공에 적합한 TIG 용접(tungsten inert gas welding)을 하였다. 진공 chamber는 Al 5083-H321이며 flange의 재질은 Al 2219-T852이다. Sector chamber Ⅰ, Ⅱ의 총 용접 길이는 각각 27m, 37m이며 진공에 유해한 균열과 virtual leak가 생기지 않도록 하는 용접조건 등을 선정하였다. In order to maintain a beam life time of more than 5 hours, the PLS vacuum chamber should be in the pressure of 10^(-10)torr. Thus welding of The PLS chambers should be free of cracks and virtual leaks. Important things related to chamber closed welding and Al-flange welding and described such as welding preparation, welding condition, leak test and welding repair.
Towards Scalable and Cost-efficient Software-Defined 5G Core Network
Jong Han Park(박종한),Changsoon Choi(최창순),S angsoo Jeong(정상수),Minsoo Na(나민수),Sungho Jo(조성호) 한국통신학회 2016 정보와 통신 Vol.33 No.6
Network and network functions virtualization (NFV) promise a number of attractive benefits and thus have driven mobile network operators to transform their previously static networks to more dynamic and software-defined networks. In this article, we share a mobile network operator’s view based on implementation and deployment experiences in the wild during the past few years towards a software-defined 5G core network. More specifically, we present a practical point of view from mobile network operators and elaborate on why some of the virtualization benefits such as total cost of ownership (TCO) reduction are not easily realized as initially intended. Then, we describe 5G visions, services, and their requirements commonly agreed across mobile operators globally. Given the requirements, we then introduce desirable characteristics of 5G mobile core network and its key enabling technologies.