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Zn_xFe_(3-χ)O_(4-δ)를 이용한 이산화탄소의 분해
양천모(Chun Mo Yang),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1
Zn_χFe_(3-χ)O_4(0.003<X<0.08) was synthesized by air oxidation method for the decomposition of carbon dioxide. We investigated the characteristics of catalyst, the form of methane by gas chromatograph after decomposition of carbon dioxide and kinetic parameter. Zn_χFe_(3-χ)O_4(0.003<X<0.08) was spinel type structure. The surface areas of catalysts(Zn_χFe_(3-χ)O_4(0.003<X<0.08)) were 15~27 ㎡/g. The shape of Zn_0.003Fe_2.997O_4 was sphere. The optimum temperature for the decomposition of carbon dioxide into carbon was 350℃. Zn_0.003Fe_2.997O_4 showed the 85% decomposition rate of carbon dioxide and the degree of reduction by hydrogen(δ) of Zn_0.003Fe_2.997O_4 was 0.32. At 350℃, the reaction rate constant and activation energy of Zn_0.003Fe_2.997O_3.68 for the decomposition of carbon dioxide into carbon were 3.10 psi^(1-α)/min and 0.98 kcal/mole respectively. After the carbon dioxide was decomposed, the carbon which was absorbed on the catalyst surface was reacted with hydrogen and it became methane.
양천모(Chun Mo Yang),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1
N/A Zn_χFe_(3-χ)O_4(0.003<X<0.08) was synthesized by air oxidation method for the decomposition of carbon dioxide. We investigated the characteristics of catalyst, the form of methane by gas chromatograph after decomposition of carbon dioxide and kinetic parameter. Zn_χFe_(3-χ)O_4(0.003<X<0.08) was spinel type structure. The surface areas of catalysts(Zn_χFe_(3-χ)O_4(0.003<X<0.08)) were 15~27 m^2/g. The shape of Zn_0.003Fe_2.997O_4 was sphere. The optimum temperature for the decomposition of carbon dioxide into carbon was 350℃. Zn_0.003Fe_2.997O_4 showed the 85% decomposition rate of carbon dioxide and the degree of reduction by hydrogen(δ) of Zn_0.003Fe_2.997O_4 was 0.32. At 350℃, the reaction rate constant and activation energy of Zn_0.003Fe_2.997O_3.68 for the decomposition of carbon dioxide into carbon were 3.10 psi^(??-??)/min and 0.98 kcal/mole respectively. After the carbon dioxide was decomposed, the carbon which was absorbed on the catalyst surface was reacted with hydrogen and it became methane.
오수나 ( Su-na O ),오인영 ( In-young O ) 한국미용예술경영학회 2011 미용예술경영연구 Vol.5 No.1
In this research, we selected and observed the features of facial ratio of female entertainers that worked in early 1990s and late 2000s who recognized by adult women as ‘beauty-face’. Participants were 189 women living in Seoul and Kyung-gi area, and they are interested in beauty-related blog and other website. And we measured and calculated average facial ratios of 10 female entertainers with their pictures (1 picture for each). As result, women with ages of 40s recognized that actress who has 'beauty- face’ in late 2000s have short ‘middle face’ and ‘lower face’ compared to actress of late 1990s, and they have wider ‘Endocanthion-endocanthion’ but shorter ‘Cheilion-cheilion’. These factors make them to look younger. Moreover, they have short and narrow lower jaw and this is one of typical features of young-looking face. Therefore, the ‘beauty- face’, that thought about women has the factors of young-looking face. This is because ‘young-looking face’ became the ideal of beauty face in our society and it reflected to women's awareness of beauty-face.
Suicide cancer gene therapy using pore-forming toxin, streptolysin O.
Yang, Wan Seok,Park, Sue-O,Yoon, A-Rum,Yoo, Ji Young,Kim, Min Kyung,Yun, Chae-Ok,Kim, Chul-Woo American Association for Cancer Research, Inc 2006 Molecular Cancer Therapeutics Vol.5 No.6
<P>We cloned the streptolysin O gene from the Streptococcus pyogenes genome and tested the possibility of using it as an anticancer reagent. Transient transfection of the streptolysin O gene efficiently killed 293T cells after 12 hours of transfection as determined by lactate dehydrogenase release and propidium iodide uptake. No caspase activity was observed and necrosis was prominent during streptolysin O-induced cell death. Biochemical analysis of streptolysin O protein revealed that the deletion of only 5 amino acids from the COOH-terminal region of streptolysin O, which is essential for cholesterol binding activity, abolished its cell-killing activity, whereas the NH2-terminal region was more resilient, i.e., up to 115 amino acids could be deleted without changing its cell-killing activity. We generated a streptolysin O-expressing adenovirus and injected it into human cervical cancer cell-derived tumors grown in a nude mouse model. Twenty-one days postinjection, the average size of tumors in the streptolysin O adenovirus-injected group was 29.3% of that of the control PBS-treated group. Our results show that the genes of pore-forming toxins, like streptolysin O protein, have the potential to establish a novel class of suicide gene therapeutic reagents.</P>
Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>
Young Jin Kim,Yong Man Lee,Hyang Mok Lee,O Ok Park 한국화학공학회 1994 NICE Vol.12 No.5
N/A An investigation of the biodegradable polymers based on starch has been accomplished. Starch needs to be modified before blending with low density polyethylene(LDPE) because of its hydrophilicity. Three kinds of modification methods were applied to obtain the compatibility to starch-LDPE blends. The first one was the esterification of the hydroxyl group of starch with acetic anhydride. The second was the copolymerization of actylonitrile and styrene onto starch. The last was the esterification reaction of the hydroxyl group of starch with three kinds of ionomers. The tensile strength, % elongation, Young`s modulus, and shear viscosities of blends of the modified starch and LDPE were examined. Ionomer-treated starch showed better compatibility with LDPE to give better performances than other blends.
O&,apos,Doherty, S.,Rigby, M.,Mü,hle, J.,Ivy, D. J.,Miller, B. R.,Young, D.,Simmonds, P. G.,Reimann, S.,Vollmer, M. K.,Krummel, P. B.,Fraser, P. J.,Steele, L. P.,Dunse, B.,Salameh, P. K.,Harth, Copernicus GmbH 2014 Atmospheric chemistry and physics Vol.14 No.17
<P>Abstract. High-frequency, in situ observations from the Advanced Global Atmospheric Gases Experiment (AGAGE), for the period 2003 to 2012, combined with archive flask measurements dating back to 1977, have been used to capture the rapid growth of HFC-143a (CH3CF3) and HFC-32 (CH2F2) mole fractions and emissions into the atmosphere. Here we report the first in situ global measurements of these two gases. HFC-143a and HFC-32 are the third and sixth most abundant hydrofluorocarbons (HFCs) respectively and they currently make an appreciable contribution to the HFCs in terms of atmospheric radiative forcing (1.7 ± 0.04 and 0.7 ± 0.02 mW m−2 in 2012 respectively). In 2012 the global average mole fraction of HFC-143a was 13.4 ± 0.3 ppt (1σ) in the lower troposphere and its growth rate was 1.4 ± 0.04 ppt yr−1; HFC-32 had a global mean mole fraction of 6.2 ± 0.2 ppt and a growth rate of 1.1 ± 0.04 ppt yr−1 in 2012. The extensive observations presented in this work have been combined with an atmospheric transport model to simulate global atmospheric abundances and derive global emission estimates. It is estimated that 23 ± 3 Gg yr−1 of HFC-143a and 21 ± 11 Gg yr−1 of HFC-32 were emitted globally in 2012, and the emission rates are estimated to be increasing by 7 ± 5% yr−1 for HFC-143a and 14 ± 11% yr−1 for HFC-32. </P>
Fabrication of Silver Nano-Hole Pattern with Different Hole Sizes by Thermal Transfer Printing
Yang, Young Jo,Choi, Hong Kyoon,Park, O. Ok American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.8
<P>The surface plasmon effect occurs in the silver nano-hole films; however, it is hard to make large-area patterns for use in optoelectronic devices. The aim of our research was to fabricate Ag nanohole patterns in a relatively large area with a cost effective method, called thermal transfer printing. Thermal transfer printing is combined with colloidal lithography and soft lithography to fabricate two-dimensional hexagonal arrays of colloidal particles without an interlayer between polymeric colloidal particles and the target substrate. First, three-dimensional colloidal crystals consisting of polystyrene colloidal particles with diameters of 270 nm, 370 nm, and 480 nm were prepared. Next, a top layer of colloidal crystals, which had been pre-etched by oxygen plasma treatments, was transferred to a properly heated glass substrate using a polydimethylsiloxane stamp. Thus, Ag nanohole patterns could be obtained after the metal layer was deposited and the colloidal particles were removed from the film. The hole diameter was easily controlled by O-2 plasma etching. The Ag nano-hole patterns absorb half of the visible light in the region between 541 nm and 725 nm. It can be immediately applied in optoelectronic devices.</P>
Antony Otinga Oteng’o,Jose Avila-Peltroche,So Young Jeong,Boo Yeon Won,Tae Oh Cho 한국환경생물학회 2018 환경생물 : 환경생물학회지 Vol.36 No.3
Acinetospora asiatica and Botrytella reinboldii are reported as two new records from S. Korea based on morphological studies and molecular analyses. A. asiatica is mainly characterized by the presence of sparsely branched uniseriate filaments with diffused meristematic zones, the formation of crampons at right angles, and the formation of plurilocular sporangia on both prostrate and erect filaments. B. reinboldii is characterized by the presence of irregularly alternating branched uniseriate filaments attached by rhizoids, and single or clustered plurilocular sporangia with a single opening. Molecular analyses of rbcL gene revealed that A. asiatica and B. reinboldii are placed within each clade of Acinetospora and Botrytella, respectively.
유영효(Young Hyo Yu),박남준(Nam Jun Park),김병오(Byung O Kim),최문정(Moon Jung Choi),심점순(Jeom Soon Shim),강태충(Tae Chung Kang),이재욱(Jae Wook Lee),김대영(Dae Young Kim) 대한약학회 1994 약학회지 Vol.38 No.3
In vitro and in vivo antibacterial activities of DWQ-013(1-cyclopropyl-6,8-difluoro-7-(3-methylthiomethylpyrrolidinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid), a new fluoroquinolone antibacterial agent, were compared with those of ciprofloxacin, sparfloxacin and ofloxacin against aerobic and anaerobic standard strains and clinical isolates. DWQ-013 had a broad spectrum and potent antibacterial activity against Gram-positive and Gram-negative bacteria. The antibacterial activity of DWQ-013 against Staphylococcus aureus was equal to that of sparfloxacin(SPFX) and superior to those of ciprofloxacin(CPFX). The antibacterial activity against Gram-negative bacteria was slightly lower than those of ciprofloxacin and sparfloxacin. MIC of DWQ-013 against Pseudomonas aeruginosa(0.781- 1.563mcg/ml) was usually equal to that of sparfloxacin(O.781mcg/ml) and was inferior to that of ciprofloxacin(O.098mcg/ml). The number of viable cells was decreased rapidly after addition of DWQ-013 at concentration of 1-2 folds of MIC.