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홍성현,형준호 한국결정학회 1994 韓國結晶學會誌 Vol.5 No.1
Hot Tungsten Filament법에 의해 실리콘(Si), 몰리브데늄(Mo), 타이타늄(Ti), 텅스텐(W) 기판 위에 다이아몬드 박막을 증착시시키고 SEM, X선 회절분석 및 Raman spectroscopy로 분석하였다. 증착시간에 따른 증착실험의 결과로부터 내열금속위에 증착한 다이아몬드박막의 경우에는 먼저 탄화물 층이 형성되고, 그 이후에 다이아몬드가 핵형성되어 성장함을 알 수 있었다. 내열금속에 증착한 다이아몬드 박막은 5기판 위에 증착한 것과 비교할 때, 핵이 많이 형성되었고 facet이 잘 발달된 입자가 적었다. 5기판 뿐만 아니라 내열금속 기판 위에 다이아몬드막을 증착시킬 경우, 다이아몬드의 Raman 피크는 천연 다이아몬드에 비해 높은 주파수쪽으로 이동되었다. 이와같은 Raman 피크의 이동은 다이아몬드와 기판 사이의 열충격보다는 완충층의 역활을 하는 탄화물과 다이아몬드 사이의 열충격을 고려할 때 효과적으로 설명이 가능하였다. 생성된 탄화물의 형태와 다이아몬드 사이에 열충격이 가장 큰 Mo기판의 경우, 다이아몬드 Rarirm 피크의 이동이 가장 크게 나타났으며 Ti, W, Si기판의 순서로 이동이 적게 관찰되었다. Diamond thin films were deposited on silicon, molybdebum, titanum and tugsten substrates, and were chlwntnizen using scanning electron microscopy, X-ray diffraction analysis and Raman spectroscopy. From the result of experiment in various deposition periods, it was found that found that were nucleated and grown on interlayed carbide layers, which were formed on refractory metal substrates at the initial stage of.
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홍성현,Hyun-Jin Kim,송명엽 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The variations of the amount of hydrogen generated with the kind of powders and the condition of the magnesium and magnesium hydride powders were investigated. By the reaction of Al, TiH2 and unmilled and milled Mg powders with water, the H2 generation rates were very low and the quantities of H2generated were extremely small. The quantity of H2 generated by the reaction of unmilled MgH2 powder with water was greater than those generated by the reactions of Al, TiH2, and unmilled and milled Mg powders with water. The MgH2 powder milled for 2 h, with finer particles, generated much more H2 by its reaction with water than unmilled MgH2 powder. The MgH2 + 5%MgO powder milled for 2 h generated much more H2 by its reaction with water than the Al, TiH2, unmilled Mg, milled Mg, unmilled MgH2, and milled MgH2 powders.
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고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가
홍성현,김규용,윤용상,전영석,구경모 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated.
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Synthesis of a Ti–Cr–V alloy by pulsed current assisted reaction
홍성현,송명엽 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
Preparations of a Ti–Cr–V alloy were tried by applying pulsed electric current through compacted mixtures of TiO2, V2O5, Cr2O3 and C, and of TiH2, Cr and V after ball-milling into fine powder. TGA and DTA curves for a mixture of TiO2, V2O5, Cr2O3 and C showed that weight decreased up to about 1423 K. The Ti–Cr–V alloy could not be prepared from a mixture of TiO2, V2O5, Cr2O3 and C. However, from a mixture of TiH2, Cr and V, the Ti–Cr–V alloy formed together with phases of Cr1.93Ti1.07, Ti or C.
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Improved Functionality of Soft Soybean Curd Containing Monascus Fermented Soybean Ethanol Extract
홍성현,이인형,김석중,임지영 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.3
Monascus fermented soybeans (MFS) were produced by solid state fermentation and ethanol extractions were carried out to recover monacolin K (MK) and isoflavones from the MFS. About 99 and 87% of monacolin K (891 mg/kg) and isoflavones (895 mg/kg)were recovered by 80%(v/v) ethanol extraction. The 80%ethanol extract also showed significantly higher antioxidant activities (DPPH, ABTS radical scavenging activity, and ferric reducing antioxidant power) than the other ethanol extracts prepared by either 40 or 60% ethanol. The 80%Monascus fermented soybeans extract (MFSE) also contained significant α-glucosidase inhibitory activity (2.7acarbose g equivalents/g MFS). Based on the results,MFSE can be used to enrich bioactive MK and isoflavone aglycones in soft soybean curd products.
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홍성현,주태우,주진우 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1
A potent anti-inflammatory compound was isolated and identified from leaves of Ligularia fischeri. The ethyl acetate fraction was used for purification of the compound and yielded 3,5-dicaffeoylquinic acid (DCQA). The identity of the compound was confirmed using 1H, 13C NMR, and MS analysis. DCQA showed strong DPPH (IC50=4.26 μg/mL), ABTS (TEAC value=0.9974) radical scavenging, and FRAP activities (=3.84 mmole of Trolox equivalent/g). DCQA effectively inhibited production of NO in RAW 264.7 cells induced using lipopolysaccharide (LPS) in a concentration dependent manner (50-250 μg/ mL). DCQA significantly suppressed (p<0.05) up-regulation of inducible NO synthase (iNOS), cyclooxygenase-2 (COX- 2), and tumor necrosis factor-α (TNF-α) gene expressions. The isolated DCQA can be useful for development of effective anti-inflammatory agents.
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