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Towards Future Mobile Network: Harnessing the Transformative Nature of NFV and SDN
이동기,박종한,박진효,Lee, D.K.,Park, Jong-Han,Park, Jin-Hyo The Korea Institute of Information and Commucation 2014 정보와 통신 Vol.31 No.6
Mobile operators today face yet another critical challenge as technology lifecycle becomes increasingly short and also as heterogeneous and complex network becomes exceedingly expensive and difficult to manage. With extremely competitive market and demanding users, the overall revenue structure is expected to get worse. A network architecture based on software-defined networking (SDN) and virtualization techniques gives operators greater opportunity to build cost-effective and efficient alternative to the legacy. In this work we review our Carrier Cloud as a future mobile network infrastructure that exploits both SDN and NFV in order to increase the operator agility, reduce the cost, and even disrupt the vendor landscape. This new architecture will not be fully adopted by the conservative operators at once. Technological hurdles have to be overcome, and a clear understanding of operational differences must be preceded.
쉘요소의 두께방향 적분점 개수에 따른 스프링백 예측 분석
이동기(D. G. Lee),송민철(M. C. Song) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Shell element modeling is applied to finite element analysis of sheet metal forming including bending work. In bending work analysis, however, the result by shell element model shows quite difference with real phenomenon in general. In this study, the number of integration points in thickness direction of shell element is focused on increasing springback prediction accuracy. In single curvature forming analysis, springback prediction accuracy shows increase proportionating to the number of integration points and this result is similar to former studies. In double curvature forming analysis, the formed radius of the blank is also increased along with the number of integration points.
간장 및 담도 : 간농양 치유 후 추적 영상진단상 이상 소견을 나타내는 간농양의 조직병리학적소견
이동기(D . K . Lee),김원호(W . H . Kim),한광협(K . H . Han),최흥재(H . J . Choi),박찬일(C .I . Park) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.1
N/A Medical therapy is standard for intrahepatic abscess and generally effective, but frequently radiologically abnormal lesion persist for long time followed by ultrasonography(US) or abnormal C-T, even after successful medical treatment including aspiration and complete clinical recovery. To access the histologic features of medically healed abscess but not disappeared completely in follow-up US or ahdominal C-T we performed liver biopsies in 5 cases of healed liver abscesses. The biopsy specimens were obtained at the margin of the lesions by cutting needle with ultrasono- graphic guiding. The biopsies were performed one time in one patient at variable period after treatment, 4 weeks in 2 cases, 6, 12 weeks & 17 months in each one case. The lobular architecture of the liver was relatively well preserved except the 2 specimens obtained at 4 weeks after treatment. And the specimens within 2 months showed hemorrhagic features rather than inflammatory, such as central hemorrhagic necrosis with extravasation of RBC. The sinusaidal system was dilated slightly. Some fibrosis involving portal tract and parenchyme of the liver was noted in the specimen of 6 weeks and 12 weeks. The specimen obtained at 17 months after treatment showed nearly normal liver architecture except minimal infiltration of lymphocyte in portal tract and parenchyme. Therefore, we concluded that in completely healed liver abscess, enen if abnormal reaiologic lesion persist for long time, the histologic feature of the lesion showed some hemorrhagic necrosis and infiltration of chronic inflammatory cells.