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용융탄산염 연료전지용 환원전극 : 2 . 니켈 및 니켈 - 코발트 합금의 용해도 2 . Solubility of Ni and Ni-Co Alloy
양부영,김규영 한국부식학회 1999 Corrosion Science and Technology Vol.28 No.6
The stability of Ni and Ni-Co alloy powder specimens in situ oxidized in Li+K carbonate melt was investigated. Ni-Co alloy powder specimens were fabricated by the chemical reduction method, and a spherical powder less than 1 um in diameter was obtained. The oxide formed by the in situ oxidation had relatively coarse grains when the Ni plaque was oxidized, whereas the oxide had very fine grains when the Ni-Co alloy plaque was oxidized. Between the NiO and (Ni,Co)O produced by in situ oxidation of porous Ni and Ni-Co alloy plaques, the solubility of (Ni,Co)O was lower than that of NiO. As the Co concentration in the oxide was increased, the solubility decreased. This result suggests that the stability of the Ni cathode during long-term service in the molten carbonate could be increased by addition of Co.
GSM 단말기에서 두부 팬텀 조건하의 방사 전력 최적화를 위한 단말기 구조에 관한 연구
양부영,김정민,육종관,Yang, Bu-Young,Kim, Jung-Min,Yook, Jong-Gwan 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7
본 논문에서는 폴더형 휴대 단말기에서 머리와 단말기가 인접해지는 통화 조건에서의 방사 전력을 향상시킬 수 있는 방법을 제시하였다. 향상된 방사 성능을 분석하기 위해 자유 공간에 EUT만 있을 경우와 머리 팬텀이 함께 있을 경우에 EUT의 TRP를 측정하였고 단말기의 구조 중 팬텀 조건에서의 TRP(Total Radiated Power) 감쇄에 영향을 주는 요소들을 가인자로 설정하고 변경 실험을 하였다. TRP의 가인자 중 실제로 영향을 주는 것으로 나타난 인자들은 안테나의 길이와 위치, 폴더의 각도, 안테나 주변의 그라운드 연결 방법이었고 이 부분들을 개선하여 팬텀 적용시 TRP의 감쇄가 개선전보다 약 5 dB 향상될 수 있음을 확인할 수 있었다. This thesis suggests ways on how to enhance handset radiation power under head phantom condition. Generally, peak EIRP(Effective Isotropic Radiated Power) is used to measure the radiation performance. TRP is more effective to represent indication of mobile radiation performance in the field than EIRP. In this case, we measure the TRP as an index of radiation power. The factors which effect TRP are antenna length, antenna position, folder angle and ground connection method. More detailed analysis is performed over these items. Significant item is ground connection method between main PCB and folder GND. Using the FPCB we connect main GND to folder GND through the hinge near the antenna. The result is that TRP attenuation is decreased about 5 dB under head phantom condition.