• Title/Summary/Keyword: 박정현

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Nicalon-Fiber-Reinfored SiC Composites Via Infiltration (Infiltration 공정으로 제조한 Nicalon 섬유강화 SiC 복합재료)

  • 김민수;김영욱;한경섭;박정현
    • Journal of the Korean Ceramic Society
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    • v.30 no.12
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    • pp.993-998
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    • 1993
  • Nicalon-fiber-reinforced SiC composites were fabricated via polymer solution infiltration/chemical vapor infiltration (PSI/CVI) and CVI. Specifically, data were taken and compared for flexural strength, fracture toughness, and processing time. The two process resulted in comparable mechanical properties, and PSI/CVI process resulted in significantly reduced infiltration time.

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Baseline Analysis Using L1/L2 Carrier Phase of GPS (GPS L1/L2 반송파를 이용한 기선해석)

  • 박정현;강준묵
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2004.04a
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    • pp.125-130
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    • 2004
  • As an application of GPS is increased by world geodetic system introduction gradually, in this time, It is increased necessary of GPS baseline analysis program development. In this study, I developed a baseline analysis program by L1/L2 carrier. And I compared a baseline analysis result with a commercial program. I showed precision of approximately ${\pm}$1cm in a baseline length in case of Narrow lane as a result that a baseline analysised a developed program.

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