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Free-Positioning Wireless Power Transfer Using a 3D Transmitting Coil for Portable Devices
Nam Ha-Van,Hoang Le-Huu,Minh Thuy Le,Kwangsuk Park,Chulhun Seo 한국전자파학회JEES 2020 Journal of Electromagnetic Engineering and Science Vol.20 No.4
The free-positioning wireless power transfer (WPT) system has drawn attention in recent years. Traditionally, a WPT system can transfer energy in one or two directions on the same plane, but it leads the restrictions of angle and axis misalignment between a transmitter and a receiver coil. In this paper, we propose a free-positioning WPT system using a three-dimensional cubic-shaped transmitting coil for portable device charging. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. In addition, the equivalent circuit and the mutual inductance between the Tx and Rx coils are analyzed. Finally, a practical experiment is implemented to verify the transfer performance, which can reach up to about 50% power transfer efficiency. The proposed system can charge in spatial freedom.
Numerical Simulation of Wind effect acting on ship using Nonlinear equilibrium expressions
Le Thanh Dat,Yu-Chang Seong,Nam-kyun Im 해양환경안전학회 2012 해양환경안전학회 학술발표대회 논문집 Vol.2012 No.04
In the field of study about the effect of environment in marine context, various reports have been given on the research of wind forces and moments acting on ship by using wind calculating methods and experiments over a long time.
A novel strain of porcine deltacoronavirus in Vietnam
Le, Van Phan,Song, Sok,An, Byung-Hyun,Park, Gyu-Nam,Pham, Ngoc Thach,Le, Dinh Quyen,Nguyen, Van Tam,Vu, Thi Thu Hang,Kim, Ki-Sun,Choe, SeEun,An, Dong-Jun Springer-Verlag 2018 Archives of virology Vol.163 No.1
<P>Two porcine deltacoronavirus (PDCoV) strains (Binh21 and HaNoi6) were isolated from two pig farms in North Vietnam. Phylogenetic analysis of the complete genomes and the Spike and Membrane genes revealed that the two Vietnam PDCoVs belong to the same lineage as PDCoVs from Thailand and Laos; however, the N genes belonged to the same lineage as PDCoVs from the USA, Korea, China, and Hong Kong. The recombination detection program subsequently identified the major parent (S5011 strain) and minor parent (HKU15-44 strain) of the two Vietnam PDCoV strains (p < 0.01).</P>