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김정호,마대영,신흥교,김상현 慶尙大學校生産技術硏究所 1990 生産技術硏究所論文集 Vol.6 No.-
As high Tc superconductor is developed recently, the effect of electrode on the dielectric breakdown characteristics of liquid N₂is studied in the thesis. The polarity effect of liquid N₂depends on the electrode distance. In a short qap, the breakdown voltage is highest for uniform field and becomes lower for positive needle and lowest for negative needle. In a long gap, however, The order is reversed. From the results it may be concluded that the breakdown mechanism of liquid N₂is the positive streamer breakdown for positive needle and the bubble breakdown for negative needle. This conclusion can be supported from several other experiments concerning conditioning effect, pressure dependence, and so on. In the design of cryogenic insulation it is recommented to coat an electrode with insulating material (SiO₂)and to use commercial liquid N₂rather than highly purified liquid N₂coolant and insulating material. But low breakdown voltage of cryogenic gas N₂requires caution in the design.
AZO(ZnO:Al)투명도전막의 전기적 및 광학적 특성
이형기,마대영,박기철 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Highly conductive and transparent films have been fabricated by RF magnetron sputtering from the ZnO targets mixed with Al_(2)O_(3) ranging from Owt.% to 5wt.%. And electrical and optical properties of them have been investigated as functions of deposition conditions. Optimized AZO films 1500A thick had optical transmittance of 90% at 550nm and Hall resistivity of 4.7x10^(-4)Ω.cm.