• Title/Summary/Keyword: Yoon Dong-ju

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Visual Inspection of Wood Crafts in Uses around World (용도별 세계목공예품의 수종조사)

  • Kim, Sa-Ick;Jo, Jong-Su;Yoon, Seung-Lak;Roh, Jeong-Kwan;Ra, Jong-Bum;Kim, Dong-Kooi
    • Journal of the Korea Furniture Society
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    • v.17 no.1
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    • pp.11-22
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    • 2006

  • This study attempted to visually inspect eight hundred wood crafts collected from various countries. These include sculputures, toys, jewl cases, kitchen wares, candle holder and wooden vases, stationery, sport outfits and etc. The most impressive wood is Myrtlewood, a broadleaf evergreen which grows along the coastline of southern Oregon and northern Califonia. Myrtlewood possesses a wide variety of grove patterns. This unique wood varies in color from a deep, rich brown to silver grey, red and every yellow. Myrtlewood is being recognized as being one of the most beautiful hardwoods in the world.

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The Secondary LLC Series Resonant Converter for the Boost DC/DC Converter (변압기 2차측 LLC 직렬공진컨버터 적용 승압형 DC/DC 컨버터)

  • Lee Hyun-Kwan;Lee Gi-Sik;Chung Bong-Geon;Kong Young-Su;Kim Eun-Soo;Cha In-Su;Yoon Jeong-Phil
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.277-280
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    • 2006

  • Recently, the high frequency isolated boost DC/DC converter has been widely used for the PCS (Power Conditioning System) system because of its small size and low cost. However, the high frequency isolated boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have the problems such as the high conduction losses and the surge voltage due to the high circulating current and the leakage inductance, respectively. To overcome this problems, in this paper the secondary LLC resonant converter is proposed, and the experimental results of the secondary LLC series resonant converter for boost DC/DC converter are verified on the simulation based on the theoretical analysis and the 1kW experimental prototype.

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