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용융온도와 유지시간이 용융법으로 제작한 고온초전도체의 임계특성에 미치는 영향
임성훈,한태희,박경국,임성우,조동언,한병성,Lim, Sung-Hun,Han, Tae-Hee,Park, Kyung-Kuk,Yim, Seong-Woo,Cho, Dong-Eon,Han, Byoung-Sung 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.2
The effects of melting temperature and holding time on the critical current density($J_c$) of $YBa_2Cu_3O_x$ based superconducting bulk fabricated by MPMG process were investigated. The amount of the formed $Y_2BaCuO_5$ phases increased with the melting temperature. However, the value of critical current density was highest at 1120 $^{\circ}C$. With this proper melting temperature, the effect of holding time on the critical characteristics was also investigated. In the case of Ag addition, the volume of the formed $Y_2BaCuO_5$ phase when the amount of Ag addition was 10 wt% and 20 wt% was observed to be highest at 20 minute and 40 minute respectively. But in the specimen without Ag, volume of $Y_2BaCuO_5$ phase increased as the holding time increased. The proper melting temperature and the holding time obtained were 1120 $^{\circ}C$ and 20 minute. The long holding time was not effective for the $J_c$ improvement as well as the formation of $Y_2BaCuO_5$.
일정범위내의 임의개체 원격제어를 위한 개체인식 시스템에 관한 연구
박경국,이현수,김성호,이영구,한병성 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
In this paper, we studied on the system which could distinguish and recognize the arbitrary individuals within a defined range. The introduced recognition method of individual in this study gives the inherent pulse of PWM form to each individual and permits a personal computer to recognize the signals. Therefore, information of data management and remote control will be performed through the connecting apparatuses for measurement and control to individuals within a defined range.
고온초전도 마이크로스트립 패치 안테나의 입력 임피던스와 급전기술
정동철,박경국,김정훈,한병성 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
Applying HTS to microstrip patch antenna, one of the most difficult problems is the impedance matching at feed point. For good impedance matching, exact solutions of input impedance must be calculated. In this paper the solutions of it were presented. Thereafter, utilizing these solutions fifth feeding types of HTS antenna were fabricated and compared with identical copper antennas.