• Title/Summary/Keyword: Kyung Keun

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Fabrication of Ag doped Hydroxyapatite and its Antimicrobial Effects with the Particle Size

  • Oh, Kyung-Sik;Kim, Kyung-Ja;Jeong, Young-Keun
    • 한국분말재료학회지
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    • 제8권3호
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    • pp.192-196
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    • 2001

  • Ag doped Hydroxyapatite powder in nano-scale was successfully synthesized either by co-precipitation or by ion exchange route. The fabricated powder was successfully dispersed through freeze drying due to the prevention of secondary particles. The antimicrobial effects of nano-HAp against E.coli was superior to micron ones not only in its strength but also in duration.

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비정질 실리콘 $n^{+}-p-p^{+}$ 태양전지의 특성 연구 (Characterization of Amorphous Silicon $n^{+}-p-p^{+}$ Solar Cells)

  • 이이상;김재붕;이영근;추혜용;장진
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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    • pp.324-327
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    • 1988

  • The photovoltaic performances of a-si : H$n^{+}-p-p^{+}$ solar cells have been investigated. The optimum substrate temperature for the deposition of a-Si : H $n^{+}-p-p^{+}$ cell decreases with increasing doping concentration of the p-layer, and is less than 200$^{\circ}C$ when the gas phase doping concentration is higher than 10 ppm. The results can be explained as the dependences of substrate temperature for the relaxation of silicon atoms and for the bonded hydrogen concentration in the p-layer.

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Inhibition of HIV-1 Protease by isoflavonoids from Erythrina senegalensis

  • Lee, Ji-Suk;Ma , Chao-Mei;Hattori Masao;Oh, Won-Keun;Ahn, Jong-Seog;Kim, Yong-Hae;Tanyi Mbaforj;Wandji Jean;Tanee FomumZ
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.377.3-378
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    • 2002

  • Eight compounds were isolated from the MeOH extracts of Erythrina senegalensis for HIV-1 protease inhibitors. Their structures were elucidated as eight isoflavonoids by spectroscopic analysis. These compounds showed dose dependent inhibitory activities on HIV-l protease with $IC_{50}$ values from 0.5 to 30.0 ${\mu}$M. (omitted)

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