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류광열,강원식,김영호,장해동,홍진태,유환수,윤여표 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
The purpose of this study was to determine the antioxidative effects of Rhodiola sachalinensis Rhodiola methanol extract was fractionated sequentially with dichloromethane and butanol. Each Rhodiola fraction (water, MeOH, BuOH and CH_2Cl_2 fractions) showed the potent superoxide dismutase (SOD) activity, and had inhibitory effets on peroxide value of linoleic acid (40~57%) and lipid peroxidation (47~70%) in FE^2+/ascorbate system-induced rat liver microsome. Rhodiola methanol extract also recovered carbon tetrachloride-induced decrease in SOD by 42% and catalase activities by 50%, and had inhibitory effects (54%) on carbon tetrachloride-induced lipid peroxidation in rat liver microsome. These results suggest that Rhodiola sachalinensis has the antioxidative effects.
Cystic Medullary Thyroid Carcinoma: A Case of Undergoing Endoscopic Thyroid Lobectomy
Dong Hae Chung,Jae Yeon Seok,Yoo Seung Chung1,Eun Mee Oh1,Jung Won Ryu1,Young Don Lee1 대한갑상선-내분비외과학회 2015 The Koreran journal of Endocrine Surgery Vol.15 No.1
On ultrasonography, medullary thyroid carcinoma (MTC) shows hypoechogenicity, an irregular margin, a predominantly solid composition, and microcalcifications, similar to those observed in papillary thyroid carcinoma (PTC). MTC presenting as a cystic lesion is rare, and endoscopic thyroidectomy can be performed for benign thyroid masses and early stage PTC, however it is inappropriate for MTC regardless of cystic change. The authors report a case of cystic MTC found after endoscopic thyroid lobectomy and provide a review of the literature on this topic.
Ryu, Hae Won,Lee, Hyung Won,Jae, Jungho,Park, Young-Kwon Elsevier 2019 ENERGY Vol.179 No.-
<P><B>Abstract</B></P> <P>A base catalyst is expected to suppress coke formation of the catalyst, leading to less catalyst deactivation and more efficient production of bio-oil. To examine the feasibility of a solid-base catalyst as a lignin pyrolysis catalyst, MgO loaded on supports with different textural, acid, and base properties (i.e. carbon, Al<SUB>2</SUB>O<SUB>3</SUB>, and ZrO<SUB>2</SUB>) was applied. In addition, because the co-processing of biomass with plastic significantly improves the quality of bio-oil in the catalytic pyrolysis process, co-pyrolysis of lignin with linear low-density polyethylene was performed, and the effects of the MgO catalysts were analyzed. Thermogravimetric analysis and a tandem micro-reactor–gas chromatography/mass spectrometry system were used to evaluate the performance of the MgO catalysts in terms of thermal decomposition behavior and yield of monoaromatic hydrocarbons. Overall, MgO supported on carbon (MgO/C) showed the highest yield of aromatic hydrocarbons during the pyrolysis of lignin, due to its well-balanced acid/base sites and high surface area. Also, MgO/C exhibited the strongest positive synergy toward the production of aromatic hydrocarbons during co-pyrolysis, which suggests that a metal oxide with base properties supported on high-surface-area carbon could be an efficient catalyst for producing bio-oil with high energy density fuel additives from the lignin.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MgO supported on carbon, ZrO<SUB>2</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> are applied to the lignin pyrolysis. </LI> <LI> MgO supported on carbon (MgO/C) exhibited the highest activity for aromatic production. </LI> <LI> The high activity of MgO/C is due to its high surface area and well-balanced acid/base sites. </LI> <LI> MgO/C exhibits the synergistic production of aromatics during the catalytic co-pyrolysis. </LI> <LI> Effective deoxygenation of phenols to aromatics is possible over MgO catalyst. </LI> </UL> </P>
Ryu, Hae Won,Tsang, Yiu Fai,Lee, Hyung Won,Jae, Jungho,Jung, Sang-Chul,Lam, Su Shiung,Park, Eun Duck,Park, Young-Kwon Elsevier 2019 Chemical engineering journal Vol.373 No.-
<P><B>Abstract</B></P> <P>Various MgO impregnated catalysts were used for the catalytic co-pyrolysis (CCP) of cellulose and linear low-density polyethylene (LLDPE) at 600 °C in ambient pressure. Micro reactor-gas chromatography, a semi-batch reactor, was used as a reactor and gas chromatogram/mass spectrometry/flame ionization detector were used for product detection. Three kinds of MgO impregnated catalysts, MgO/Carbon (MgO/C), MgO/Al<SUB>2</SUB>O<SUB>3</SUB>, and MgO/ZrO<SUB>2</SUB>, were prepared by the impregnation of MgO to different s, C, Al<SUB>2</SUB>O<SUB>3</SUB>, and ZrO<SUB>2</SUB>, respectively. Activities of the three MgO-impregnated catalysts were compared with 1:5 of feedstock to catalyst ratio. MgO/C produced the highest quality oil, which consisted of a large amount of aromatic hydrocarbons during the catalytic pyrolysis (CP) of cellulose. When the MgO catalysts were applied to CCP, the selectivity to aromatic hydrocarbons over MgO/C were 13.42%, which were also much higher than those over the other catalysts, including bulk MgO, demonstrating the effectiveness of the MgO/C catalyst on aromatics formation. Importantly, the experimental BTEXs (benzene, toluene, ethylbenzene, xylenes) yields of CCP over MgO/C were also much higher than the theoretical yields, highlighting the effectiveness of hydrogen-rich LLDPE on the CP of cellulose over MgO/C. Further investigation of the cellulose/LLDPE mixing ratio showed that the amount of BTEXs during the CCP of cellulose and LLDPE could be maximized by adjusting the cellulose to LLDPE mixing ratio to 25:75.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co-pyrolysis of cellulose and LLDPE over MgO catalysts was performed. </LI> <LI> MgO catalysts with different surface area and acid/base properties were used. </LI> <LI> MgO/C has largest surface area and adequate acid-base property. </LI> <LI> MgO/C produced the largest amounts of aromatics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Study on the Design of the On-Chip 2.5V-to-1.0V VDC for Semiconductor Devices
Hae-Jun Seo,Young-Woon Kim,Gi-Ju Ryu,Jong-Bok Ahn,Tae-Won Cho 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper proposes a new on-chip voltage down converter(VDC), which employs a new reference voltage generator(RVG). The converter adopts a temperatureindependence reference voltage generator, and a voltage-up converter. The architecture of the proposed VDC has a high-precision, and it was verified based on a 0.25 ㎛ 1P5M standard CMOS technology. For 2.5V to 1.0V conversion, the RVG circuit has a good characteristic such as temperature dependency of only 0.2㎷/℃, and the voltageup circuit has a good voltage deviation within 0.12% for 5% variation of supply voltage VDD. The output voltage is stabilized with 1㎷ for load current varying from 0 to 100㎃.
A Novel Integrated DC-DC Converter with High Efficient Charge Pump for Mobile Applications
Hae-Jun Seo,Se-Hwan Han,Gi-Ju Ryu,Jong-Bok Ahn,Tae-Won Cho 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
A novel integrated DC-DC converter with high efficient charge pump for mobile applications is integrated in a poly-Si thin film transistor(TFT) display panel which generates four-voltage levels. The charge pump circuits using level shifters and switching MOSFETs for DC-DC converter adopt a multi-phase voltage converter structure to supply the positive and negative voltage source for the panel, ranging from +9V to -4.5V, required by the column multiplexer for panel and gate driver circuit. The input voltages and clock signals to the charge pump are 2.5V and 5V or less, and decreases the operational frequency of the charge pumps.
Ryu, Sung-Ha,Jo, Hae-Ran,Kim, Ji-Won,Youn, Hyun-Joo,Kim, Kyu-Bong Korean Society of ToxicologyKorea Environmental Mu 2011 Toxicological Research Vol.27 No.4
Artemisia iwayomogi, a member of the Compositae, is a perennial herb easily found in Korea and used as a traditional medicine to treat liver disease. AIP1, a water-soluble carbohydrate fraction from Artemisia iwayomogi, showed anti-tumor and immuno-modulating activities in animal studies. A subacute toxicological evaluation of AIP1 was performed for 4 weeks in ICR mice. After administration of AIP1 (0, 20, 100, 500 mg/kg/day), the clinical signs, mortalities, body weight changes, hematology, blood clinical biochemistry, urinalysis, organ histopathology, organ weights and gross finding were examined. The results showed that there were no significant differences in body weight changes, food intakes, water consumptions, or organ weights among different dose groups. Also we observed no death and abnormal clinical signs during the experimental period. Between the groups orally treated with AIP1 and the control group, there was no statistical significance in hematological test or serum biochemical values. Histopathological examination showed no abnormal changes in AIP1 groups. These results suggest that no observed adverse effect level (NOAEL) of the oral administration of AIP1 for 4 weeks was considered to be more than 500 mg/kg/day in mice under the condition investigated in current study.