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김민재,박경민,박종근,김영수,이종훈,문대성,Kim, M.J.,Park, K.M.,Park, J.G.,Kim, Y.S.,Lee, J.H.,Moon, D.S. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.2
5G networks are rapidly expanding. Simultaneously, the need for a testbed-not a commercial network-is increasing to verify aspects such as 5G network security vulnerabilities. Open-source projects in 4G networks already exist and are implemented similarly in commercial networks. Due to the compatibilty between 5G and 4G networks, 5G networks are being developed and implemented as open-source projects on the basis of 4G networks. In this study, we review the development trends of 5G open-source projects and simulators that can be used for 5G research.
다공성 매질이 존재하는 용광로 내부 이상유체 경계면의 특성
박경민(G.M. Park),이동조(D.J. Lee),이정호(J.H. Lee),윤현식(H.S. Yoon) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.1
The present study numerically investigated the deformation of the interface of two-phase fluids flow in a blast furnace. To simulate three-dimensional(3D) incompressible viscous two-phase flow in the furnace filled with the air and molten iron, the volume of fluid(VOF) method based on the finite volume method has been utilized. In addition, the porous medium with the porosity has been considered as the bed of the particles such as cokes and char etc. For the comparison, the single phase flow and the two-phase flow without the porosity have been simulated. The two-phase flow without porosity condition revealed the smooth parabolic profile of the free surface near the outlet. However, the free surface under the porosity condition formed the viscous finger when the free surface was close to the outlet. This viscous finger accelerated the velocity of the free surface falling and the outflow velocity of the fluids near the outlet.