• Title/Summary/Keyword: Lee Sam

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A Flavone Glycoside from Angelica gigas Roots

  • Lee, Sang-Hyun;Kang, Sam-Sik;Shin, Kuk-Hyun
    • Natural Product Sciences
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    • v.8 no.4
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    • pp.127-128
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    • 2002
  • A flavone glycoside was isolated from the roots of Angelica gigas (Umbelliferae) and identified as diosmin $[diosmetin-7-O-{\alpha}-{_L}-rhamnopyranosyl \;(1{\rightarrow}6)-{\beta}-{_D}-glucopyranoside]$ by spectroscopic methods. This is the first report of a flavone gylcoside from Angelica species.

Study on Doubly Fed Induction Generator in a wind turbine (DFIG 풍력발전시스템에 관한 연구)

  • Han, Sang-Yul;Cha, Sam-Gon;Choi, Won-Ho;Lee, Seung-Kuh
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.253-256
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    • 2006
  • This paper shows operating characteristics of DFIG(Double Fed Induction Generator) for wind turbine. The back to back PWM voltage-fed inverter connected between the rotor and grid network operated sub and super-synchronous operating mode, and the vector-controlled DFIG enables the decoupling between active and reactive power as well as between torque and power factor. This paper is validated by simulations and experimental results.

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A Hook-shaped Process on the Cephalosome of Centropages dorsispinatus (Copepoda, Calanoida) (Centropages dorsispinatus (Copepoda, Calanoida)의 두부에 있는 갈고리 형태의 돌기에 대하여)

  • KANG, YOUNG SHIL;LEE, SAM GEUN
    • 한국해양학회지
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    • v.27 no.3
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    • pp.247-249
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    • 1992
  • A hook-shaped process on the cephalosome of the female of Centropages dorsispinatus was obseryed using scanning electron microscopy. Two raw of sensory pores, each with a central cilium were found just anterior to the process. The tip of the process was bifurcated.

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