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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.
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.
화염 스프레이 공정에서 다양한 연료에 따른 열-유동 특성 해석
이재빈(J.B. Lee),김대윤(D.Y. Kim),이동기(D.K. Lee),이성혁(S.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The present study aims to examine the characteristics of flow with respect to various fuel conditions in the flame spray coating process. The flame spray flow is characterized by very complex phenomena including combustion, turbulent flows, and convective and radiative heat transfer. In this study, we simulated flame spray process by using a commercial computational fluid dynamics (CFD) code of FLUENT (ver. 13.0) to predict gas dynamics involving combustion, gas temperature and velocity distributions. Also, we examined the effect of type of fuel and equivalence ratio on the flame spray process. It was found that axial gas temperature increased from initial temperature to maximum temperature while flame goes to the substrate because fuel reacts additionally to oxygen in the air in radial direction.
섬유강화 열가소성 고분자 복합판의 압축성형에 있어서 평균분리계수에 관한 연구
강건,조선형,이동기,김이곤,Kang, K,Jo, S.H.,Lee, D.G.,Kim, E.G 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
The properties of FRP(fiber-reinforced plastics) depend not only on the characteristics of the matrix but also on the structure of fiber mat and the fiber type of reinforcement. Therefore it is very important to study the characteristics of reinforcement and matrix. In this paper, a method is proposed which can be used to measure the mean coeffcient of separation for the press molding of FRP, and the mean equivalent coefficient of separation is obtained from the separation coefficient. And the relationship between the mean equivalent coefficient of separation and the structure of fiber mat is discussed. The effects of corrlelation coefficient between separation and orientation on the mean equivalent coefficient are also presented.