• 제목/요약/키워드: Kyung Keun

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Aggregation of Polyynes on Metal Nanoparticles

  • Kim, Kuk-Ki;Shin, Seung-Keun;Park, Seung-Min
    • Bulletin of the Korean Chemical Society
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    • 제33권2호
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    • pp.625-628
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    • 2012
  • We investigated the interaction between polyynes (linear carbon chains) and various metal nanoparticles (Ag, Au, and Cu) to provide insight into the optical properties of metal-polyynes systems prepared by different experimental techniques. Polyynes were produced by laser ablation in deionized water, metal nanoparticles solutions, and copper chloride solution. Metal nanoparticles complexes with polyynes were analyzed by Raman, surface-enhanced Raman scattering, and UV-vis spectroscopy.

용량이행형 방전여기 엑사이머 레이저의 전압 전류 특성 (The Characteristic of voltage and Current in Discharge-pumped Excimer Laser with Charge Transfer Type)

  • 정재근;최부연;이주희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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    • pp.405-407
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    • 1987
  • We calculated the discharge resistance, which is determined by plasma dynamics, of the discharge pumped excimer lasers with charge-transfer type. And investigated the characteristic of discharge voltage and current using EMIP.

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Phytochemical Constituents from the Whole Plants of Diodia teres

  • Kim, Dae-Keun;Park, Hee-Wook;Eun, Jae-Soon;Baek, Nam-In
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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    • pp.200.4-201
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    • 2003
  • Ten compounds were isolated from the methanolic extract of the whole plants of Diodia teres through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as three iridoid glycosides, a coumarin glycoside, and six flavonoids by spectroscopic analysis. These compounds were isolated for the first time from D. teres.

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