• Title/Summary/Keyword: 신용덕

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A Study on the Streaming Electrification and Static Charge Elimination of Insulating Oil on Pipe Materials. (파이프 재질에 따른 절연유의 대전및재전에 관한 연구)

  • Kim, Y.W.;Cho, Y.K.;Shin, Y.D.;Jeong, H.D.;Lee, D.C.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1993.05a
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    • pp.72-75
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    • 1993

  • The characteristic of streaming electrification and static charge diminution in Cu, Fe and Sus pipes were investigated. The Cu and Fe pipes are charged positively, whereas the Sus pipes are charged negatively. Electrification rate in Cu and Fe pipes increases with increasing a pipe length for no-charged insulating oil. The electrification rate in Cu and Fe pipes abruptly increase with increasing the temperature and flow rate of insulating oil but decrease in Sus pipes. The current flows as a direction of insulating oil in all pipes.

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A study on Photolithography of band pass filter for communication devices (통신기기용 대역통과필터의 공정에 관한 연구)

  • Lee, Dong-Yoon;Shin, Yong-Deok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05c
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    • pp.247-250
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    • 2002

  • SAW filters were fabricated on $LiNbO_3$ substrates to evaluate frequency response and properties of photolithography. In the both of etch and lift-off methods, lift off method was superior to etch method in fabrication process. Frequency response property was measured by network analyzer. From measurement of acoustic property, SAW propagation velocity was 3574.9m/sec for $LiNbO_3$ SAW filter.

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