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조용상(Y.S Cho),김영렬(Y.R Kim),노승표(S.P No),심혜정(H.J. Shim),김인경(I.K. Kim) 大韓電子工學會 2012 電子工學會論文誌-TC (Telecommunications) Vol.49 No.5
최근 국내외 주요 이동통신 사업자들이 본격적으로 4G 무선표준 방식인 LTE (Long Term Evolution) 서비스를 시작 하면서 LTE 방식을 지원하는 이동단말의 MIMO (Multi Input-Multi Output) OTA (Over The Air) 성능 평가 방법의 필요성이 중요해 지고 있다. LTE 방식은 high packet data rate을 기반으로 한 무선 데이터 서비스이므로 LTE 단말의 Downlink Data throughput향상을 위한 MIMO 안테나 설계가 매우 중요하다. 본 논문에서는 3GPP (3rd Generation Partnership Project)에서 논의되고 있는 MIMO OTA 측정 시스템 중 하나인 Anechoic chamber 방식에 기반 한 MIMO OTA test system 시스템에 대한 이론 및 실험적인 검증을 수행하고 기존의 antenna의 성능 평가 방법과의 비교를 통해 데이터의 유효성을 검증하였다. Since the major cellular data service providers in U.S, Japan as well as in Korea started the LTE (Long Term Evolution) service, there has been more strong need for the methods that can accurately measure the MIMO (Multi Input-Multi Outout) OTA (Over The Air) performance of LTE handsets because the performance of the MIMO antenna determines the packet data rates in the downlink and therefore the higher system throughput of the network. In this regard, there has been a lot discussions in 3GPP on the candidate MIMO OTA test solutions. In this paper, a faire comparison has been done for the conventional method, the Envelop Correlation Coefficient (ECC) measurements, and the anechoic chamber based MIMO OTA test solution, one of the candidate system being discussed in 3GPP. The evaluations and the comparisons are conducted by numerically and experimentally.
조이현(L. H. Cho),김인기(I. G. Kim),이재일(J. I. Lee),장영록(Y. R. Jang),박인호(I. H. Park),최성을(S. E. Choi),권명희(M. H. Kwon) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.3
The magnetism and electronic structure of Ru monolayer with square lattice is investigated using the FLAPW band method. The dependence of total energies on the lattice constant was calculated for three magnetic states, i.e., para-, ferro-, and antiferromagnetic ones. It was found that there is no energy difference between para- and antiferromagnetic states for all the lattice constant. The possibility of antiferromagnetism in square Ru monolayer is thus excluded. The ferromagnetic state is most stable for the lattice constants greater than 7.30 a.u. The energy minimum is found at the lattice constant of 6.53 a.u. where it is paramagnetic. It is calculated that the magnetic moment is 2.49 μ_B at 7.72 a.u., which is close to the lattice constant of Ag. The magnetic moment is almost saturated to be 2.57 μ_B at the lattice constant of 7.86 a.u.