• Title/Summary/Keyword: KAIST

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High-efficiency Double-ended Active Clamp ZVS Forward Converter (고효율 더블 엔디드 능동 클램프 영전압 스위칭 포워드 컨버터)

  • Kim Chong-Eun;Kang Jeong-il;Han Sang-Kyoo;Moon Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2001.12a
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    • pp.124-128
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    • 2001

  • In this paper, a high-efficiency double-ended active clamp ZVS forward converter is proposed. This converter can be used in compact size AC/DC converter applications such as a notebook adapter. The principles of operation are described and the zero voltage switching characteristics are analyzed. High efficiency of this converter is verified by the experimental results.

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Bubble occurrence and interhemispheric plasma transport

  • Park, Jaeheung;Lee, Jae-jin;Lee, Ensang;Min, Kyoung-Wook
    • Bulletin of the Korean Space Science Society
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    • 2004.04a
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    • pp.72-72
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    • 2004

  • We have compared here the seasonal average of the plasma density with the EPB occurrence in a given longitude sector, using KOMPSAT-1 and DMSP data. It could be evidenced on a global scale that the EPB occurrence was nearly anti-correlated with the poleward drift speed parallel to B-field, and with the degree of asymmetry of the latitudinal plasma distribution. But, the seasonal-longitudinal change of the asymmetry was different from what the current theory expected. (omitted)

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