• 한국전기화학회:학술대회논문집
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• 2000.04a
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• pp.47-47
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• 2000

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2001.04a
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• pp.15-15
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• 2001

• Proceedings of the Korean Vacuum Society Conference
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• 2005.08a
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• pp.112-112
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• 2005

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.194-195
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• 2002

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.2
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• pp.255-261
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• 2004

Antioxidant activity of extracts from the submerged-liquid culture of mushrooms was measured using two systems : linoleic acid and mouse liver microsomes induced by various free radical sources. Mushrooms of Pleurotus ostreatus (Neutari), Phellinus linteus (Sanghwang), Paecilomyces japonicus (Dongchunghacho), Hericicum erinacium (Norugungdengyee) and Agaricus blazei (Shinryeong) in 1% mulberry tree powder-supplemented medium were incubated in a shaking incubator (200 rpm, $25^{\circ}C$) for 3 days. Hot water extracts of mycelial cultures were freeze-dried, followed by fractioning with hexane, chloroform, ethylacetate and butanol in the order. Antioxidant activity of each sample was examined in free radical-induced linoleic acid oxidation in phosphate-buffered saline (PBS ) solution by measuring the amount of malonaldehyde (MA), and mouse liver microsomal systems by measuring the amount of thiobarbituric acid reactive substances (TBARS). In linoleic acid oxidation system, hot water extracts from the cultures of Pleurotus ostreatus, Phellinus linteus, and Paecilomyces japonicus exhibited stronger antioxidant activity than aqueous or butanol fraction and the combined fraction of hexane, chloroform and ethylacetate, but the hot water extract from Pleurotus ostreatus culture was the strongest activity. The antioxidant activity of the hot water extract from Pleurotus ostreatus culture was stronger than any other fractions in mouse microsomal system. These results suggest that hot water extract of Pleurotus ostreatus culture, and the cultures of Phellinus linteus and Paecilomyces japonicus could be useful for functional materials to reduce the oxidation of lipids in food systems induced by free radicals.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.365-365
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• 2012

스퍼터된 a축 성장된 산화아연 박막의 전기적 및 구조적 특성의 DC 파워에 대한 영향을 c 축 성장된 산화아연 박막과의 비교를 통해 분석하였다. 1~103 ${\Omega}{\cdot}cm$의 낮은 비저항을 갖는 파워를 갖는 조건과 106~108 ${\Omega}{\cdot}cm$의 높은 비저항을 갖는 파워를 갖는 조건에 대한 분석을 진행하였다. 각 조건에 따른 XRD 분석을 통해 낮은 비저항을 갖는 파워를 갖는 조건의 경우 (100) 성장 방향을 강하게 나타내었으나, 높은 비저항을 갖는 파워를 갖는 조건의 경우 약한 (002) 성장 방향을 나타내었다. EDS를 이용한 분석시 낮은 비저항을 갖는 파워의 경우 상대적 으로 oxygen rich 특성을 나타내었다. 이번 연구를 통해 비저항 등 다양한 조건에 따라 결정 성장 방향이 다름을 확인하였으며, 이에 대한 분석을 통해 산화아연 박막의 성장된 조건에 따 라 다양한 전자소자에의 응용 및 분석이 필요함을 확인하였다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1B
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• pp.107-111
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• 2006

The samples collected from two reactors are analyzed by X-ray diffraction and M$\ddot{o}$ssbauer spectroscopy in this study. It is concluded that the iron oxide crystal attached on anthracite media which possesses catalytic ability is identified to be Ferrihydrite, regardless of the value of pH from the analysis of the iron oxide. Iron oxide in Batch reactor is identified to be Microcrystalline goethite.

• Korean Journal of Food Science and Technology
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• v.4 no.4
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• pp.259-264
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• 1972

Oxidative changes of the Ramyon lipids were studied under three experimental storage conditions. Ramyon was 1) exposed to fluorescent light irradiation at $25^{\circ}C$, 2) incubated in the dark at $40^{\circ}C$ and 3) irradiated with ultra-violet light at $25^{\circ}C$. In the study, changes in acid value, peroxide value, carbonyl value, TBA number, fatty acid composition and iodine value were determined with the lipids extracted from the Ramyon samples in intervals for a period of 20 weeks. Acid value, peroxide value, and TBA number of the samples under fluorescent light irradiation and $40^{\circ}C$ incubation increased slightly during storage, while a sharp increase of those values were noticed with the samples of ultra-violet light irradiation. Especially, the TBA number of the Ramyon lipid under ultra-violet light irradiation markedly increased within 10 weeks and then decreased. With this change in TBA number, however, the bound form of malonaldehyde increased gradually. During the storage under $40^{\circ}C$ incubation, and ultra·violet irradiation for 10 weeks, the content of linoleic and linolenic acids decreased, while palmitic and stearic acids increased. However, only small changes were noticed in iodine value of the samples. On the other hand, oxidative rancid odor appeared at the end of 16 weeks storage under fluorescent light irradiation and $40^{\circ}C$ incubation, while it took only 4 weeks with the sample stored under ultra-violet irradiation.

• Journal of Wetlands Research
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• v.16 no.4
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• pp.433-441
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• 2014

It has been known that sewage containing high-concentration nitrogen affects the efficiency of municipal wastewater treatment plants harmfully. Therefore, research has been actively conducted to treat sewage containing high-concentration nitrogen. The current study has analyzed organic compounds, conducted foaming tests, and operated a laboratory-level nitritation reactor with the subjects of anaerobic digester supernatant and livestock wastewater which are the typical kinds of sewage containing high-concentration nitrogen. According to the results of analyzing organic compounds, soluble inert components form the largest part of anaerobic digester supernatant while particle biodegradable components occupy the most part of livestock wastewater. About the retention time proper for the reaction of nitritation, anaerobic digester supernatant shows 2 days while livestock wastewater indicates 6 days. It seems that the difference in the proper retention time is resulted from the difference of properties in organic compounds and ammonium nitrogen concentration. In addition, livestock wastewater's reactor foam is generated comparatively more than anaerobic digester supernatant's, but it tends to be eliminated faster. It is expected that the findings of this study can be utilized as foundational data afterwards in applying the reaction of nitritation to municipal wastewater treatment plants.

• Korean Chemical Engineering Research
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• v.50 no.3
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• pp.567-573
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• 2012

Compared with the natural marble, the artificial marble has the advantages of excellent appearance, high degree of finish, even color, fine pressure and wear resistance, bear erosion and weathering, etc. It can be widely used in kitchen countertops, bath vanity tops, table tops, furniture, reception desks, etc. However, large amounts of artificial marble waste such as scraps or dust have been generated from sawing and polishing processes in artificial marble industry. Waste from artificial marble industry is increasing according to demand magnification of luxurious interior material. Artificial marble wastes can be recycled as aluminum oxide used as raw materials in electronic materials, ceramics production, etc., and methyl methacrylate(MMA) which become a raw material of artificial marble by pulverization, pyrolysis and distillation processes. The characteristics of artificial marble wastes was analyzed by using TGA/DSC and element analysis. Crude aluminum oxide was obtained from artificial marble waste by pulverization and thermal decomposition under nitrogen atmosphere. In this work, Box-Behnken design was used to optimize the pyrolysis process. The characteristics of crude aluminum oxide was evaluated by chromaticity analysis, element analysis, and surface area.