• Title/Summary/Keyword: Hyuck Jae Kwon

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Floodplain and Delta (범람원과 삼각주)

  • Lee, Eui-Han
    • Journal of The Geomorphological Association of Korea
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    • v.18 no.2
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    • pp.15-23
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    • 2011

  • The first paper on the floodplain in Korea was published in the late 1960s. In 1970s and 1980s the study on the floodplain and delta of Korea was led by Hyuck Jae Kwon(emeritus professor at Korea University) and Hwa-Ryong Jo(emeritus professor at Kyungpook National University). Kwon established the foundation of the study and Jo analyzed the alluvial landforms microscopically. Since 1990s, the study on the floodplain and delta has entered a phase of stagnation.

Design of a Bidirectional Converter for Battery Charging, Discharging and Zero-voltage Control (배터리 충, 방전 및 영전압 제어를 위한 양방향 컨버터 설계)

  • Choi, Jae-Hyuck;Kwon, Hyuk-Jin;Kwon, Jae-Hyun;Lee, Jun-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.5
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    • pp.431-437
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    • 2022

  • This study proposes a converter that makes battery charging, discharging, and zero voltage control possible. The proposed topology consists of an LLC converter and a half-bridge inverter, and all power semiconductor devices are applied Si-MOSFETs. The topology is designed with an LLC switching frequency of 100 kHz, a half-bridge inverter switching frequency of 50 kHz, and a battery voltage of 5 V. The advantages of the charging/discharging operation of the 5 V battery voltage and the zero voltage control of the battery are verified. In addition, by using a two-stage topology, the battery can be charged, discharged through current control, and discharged to zero voltage. With the proposed topology, the current can be maintained even when the battery voltage drops to zero.

  • https://doi.org/10.6113/TKPE.2022.27.5.431 인용 PDF KSCI