• Title/Summary/Keyword: Hang-no

검색결과 439건 처리시간 0.034초

Design Consideration of Half-Bridge LLC Resonant Converter

  • Choi, Hang-Seok
    • Journal of Power Electronics
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    • 제7권1호
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    • pp.13-20
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    • 2007

  • LLC resonant converters display many advantages over the conventional LC series resonant converter such as narrow frequency variation over wide range of load and input variation and zero voltage switching even under no load conditions. This paper presents analysis and design consideration for the half bridge LLC resonant converter. Using the fundamental approximation, the gain equation is obtained, where the leakage inductance in the transformer secondary side is also considered. Based on the gain equation, the practical design procedure is investigated to optimize the resonant network for a given input/output specifications. The design procedure is verified through an experimental prototype of the 115W half-bridge LLC resonant converter.

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NH$_3$-pplasma Treatment of GaAs Surface at High Tempperature in RF pparallel pplate pplasma Reactor

  • ppark, Kyoung-Wan;Lee, Seong-Jae-;Kim, Gyungock-;Lee, El-Hang-
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 1993년도 제4회 학술발표회 논문개요집
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    • pp.29-31
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    • 1993

  • NH3-pplasma treatment has been used for ppassivation of native-oxide-contaminated GaAs surface. Ex-situ band-gapp pphotoluminescence(ppL) measurement shows enhanced intensity for the treated surfaces. Auger electron sppectroscoppy(AES) shows that the treated surface contains nitrogen atoms but no arsenic atoms, which leads us to sppeculate that the graded GaN thin layer was formed on the surface. Based on these results, new metal-insulator-GaAs structure is ppropposed.

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암종증이 동반된 두경부 악성 흑색종 1예

  • 정희철;라선영;박준오;조재용;이종인;유내춘;정현철;김주항;노재경;민전식;김병수
    • 대한두경부종양학회:학술대회논문집
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    • 대한두경부종양학회 1995년도 제12차 학술대회 연제순서 및 초록집
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    • pp.217.1-217.1
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    • 1995

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국소진행 두경부종양에서 보조화학요법의 효과

  • 김철우;노재경;이석;안중배;박형천;이경희;이혜란;최진혁;유내춘;임호영;김주항;서창옥;김귀언
    • 대한두경부종양학회:학술대회논문집
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    • 대한두경부종양학회 1993년도 제10차 학술대회 연제순서 및 초록집
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    • pp.252-252
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    • 1993

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Structure Eigenvectors of the Ricci Tensor in a Real Hypersurface of a Complex Projective Space

  • Li, Chunji;Ki, U-Hang
    • Kyungpook Mathematical Journal
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    • 제46권4호
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    • pp.463-476
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    • 2006

  • It is known that there are no real hypersurfaces with parallel Ricci tensor in a nonflat complex space form ([6], [9]). In this paper we investigate real hypersurfaces in a complex projective space $P_n\mathbb{C}$ using some conditions of the Ricci tensor S which are weaker than ${\nabla}S=0$. We characterize Hopf hypersurfaces of $P_n\mathbb{C}$.

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