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M형 Ba-Ferrite에서 Fe 이온의 열 진동에 관한 연구
서정철(Jung Chul Sur),김진수(Jin Soo Ghim),최정완(Choi Jong Wan) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.1
Mossbauer and Raman spectrum studies have been carried out on the 2b-site Fe ion in the Ba-ferrite (M-type). The thermal dynamics of Fe ion was analyzed by Mossbauer spectra at different angles between the γ-ray direction and c-axis. The vibration on the 2b-site was more active compare to other direction and had very strong intensity in the Raman spectrum.
Sequence Control of Small-scaled ITER Power Supply for Reactive Power Compensation
Hye-Seong Heo(허혜성),Ki-Won Park(박기원),Hyun-Sik Ahn(안현식),Gye-Yong Jang(장계용),Hyun-Seok Shin(신현석),Jung-Wan Choi(최정완),Jong-Seok Oh(오종석) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A technology based on thyristors will be used to manufacture the super-conducting coil AC/DC converters because of the low ratio of cost over installed power compared to a design based on GTO or similar technology. But phase-controlled converter suffers from fundamental disadvantage. They inject current harmonics into the input ac mains due to their nonlinear characteristics, thereby distort the supply voltage waveform, and demand reactive power from the associated ac power system at retarded angles. To overcome this disadvantage, in the case of two series converters at the DC side, connected to the same step-down transformer, apply for the sequence control. It is the most simple and efficient way to reduce the reactive power consumption at low cost. Analytical sequence control algorithm is suggested, the validity of the proposed scheme has been verified by experimental results with the small-scaled International Thermonuclear Experimental Reactor (ITER) Power Supply to minimize reactive power consumption.