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Layer-by-Layer Doping of Few-Layer Graphene Film
Gü,neş,, Fethullah,Shin, Hyeon-Jin,Biswas, Chandan,Han, Gang Hee,Kim, Eun Sung,Chae, Seung Jin,Choi, Jae-Young,Lee, Young Hee American Chemical Society 2010 ACS NANO Vol.4 No.8
<P>We propose a new method of layer-by-layer (LbL) doping of thin graphene films. Large area monolayer graphene was synthesized on Cu foil by using the chemical vapor deposition method. Each layer was transferred on a polyethylene terephthalate substrate followed by a salt-solution casting, where the whole process was repeated several times to get LbL-doped thin layers. With this method, sheet resistance was significantly decreased up to ∼80% with little sacrifice in transmittance. Unlike samples fabricated by topmost layer doping, our sample shows better environmental stability due to the presence of dominant neutral Au atoms on the surface which was confirmed by angle-resolved X-ray photoelectron spectroscopy. The sheet resistance of the LbL-doped four-layer graphene (11 × 11 cm<SUP>2</SUP>) was 54 Ω/sq at 85% transmittance, which meets the technical target for industrial applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-8/nn1008808/production/images/medium/nn-2010-008808_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn1008808'>ACS Electronic Supporting Info</A></P>
박재용,김상락,이원구,유진식,김용대,한석영,맹주성 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
An active micro-mixer, which was composed of an oscillating micro-stirrer in the microchannel to provide rapid, effective mixing at high flow rates was analyzed. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight microchannel and microchannel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interactionafter the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model. In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced and stabilized. Therefore, an optimum design for a dynamic micro-mixer with an oscillating stirrer was performed using Kriging method in order to obtain a optimum solution. The design parameters were established as the frequency, the length and the angle of the stirrer, and the optimal values were determined to be 2.0932, 0.8D and ± 75°, respectively. It was found that the mixing index of the optimal design increased by 88.47% compared with that of the original design.
박재용,이원구,유진식,김용대,한석영,맹주성 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
An active micro-mixer, which was composed of an oscillating micro-stirrer in the microchannel to provide rapid, effective mixing at high flow rates was analyzed. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight microchannel and microchannel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interactionafter the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model, In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced and stabilized. Therefore, an approximate optimization of an active micro-mixer with an oscillating stirrer was performed using Kriging method with OLHD(Optima1 Latin Hypercube Design) in order to obtain a optimum solution. The design parameters were established as the frequency, the length and the angle of the stirrer, and the optimal values were determined to be 1.0346, 0.66D and ±45°, respectively. It was found that the mixing index of the optimal design increased by 88.72% compared with that of the original design.
고립성 폐 결절로 나타난 경화성 혈관종의 폐엽 절제술에 의한 치험 1예 : A case report
황은구,이송암,황재준,김상윤,권혁중,김요한 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.13 No.-
Patient was sixty-eight years old female. She was transferred to our department to resect the solitary pulmonary nodule on right lower lobe. Intraoperative frozen-section revealed bronchioloalveolar carcinoma. So, we performed right lower lobectomy and mediastinal lymph node dissection. Permanent pathologic diagnosis of this patient was sclerosing hemangioma. We report experience of treatment of sclerosing hemagioma presenting solitary pulmonary nodule by lobectomy with the review of literatures.
양재석,강신규,이상훈,조익한 嶺南大學校 基礎科學硏究所 191 基礎科學硏究 Vol.11 No.-
The amorphous ?? alloy are studied by Mossbauer spectroscopy at room temperature. This sample are produced by single roll quenching method. The analysis of the distribution of hyperfine fields indicates two peaks. The bimodal P(H) features are as following:?? kOe and ?? =273 kOe. This represents that this sample has the inhomogeneous magnetic structure. The average isomer shift is 0.097 mm/s, the quadrupole splitting is 0.022mm/s. The absorption intensity, b, of M??ssbauer spectrum is about 2.91 and the number of Fourier parameters is eight.
이행남,박길문,이덕구,정한별,김건일,설재림 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
The sirocco fan is used to get low noise, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc... because there are not problems even it is mixed with a any kind of liquid, gas, and solid. The flow characteristics in sirocco fan are investigated by PIV. The experiment using PIV measurement for Test section's flow characteristics acquired velocity distribution, Condition : when sirocco fan in automobile air controller maximum 1450RPM, and a revolution is a variation (l)950RPM, (2)l100RPM, (3) 1250RPM. The agreement a experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems
Jae-Gu Han,Jae-Woo Han,Chan-Jung Lee,Jae-Han Cho,Kang-Hyo Lee 한국버섯학회 2018 버섯 Vol.22 No.1
Wolfiporia cocos (F.A. Wolf) Ryvarden & Gilb. (syn., Poria cocos F.A. Wolf), a basidiomycetous fungus having subterranean growth habit, usually forms compact and hard masses of mycelium, called sclerotium, to overcome stressful environmental conditions. In East Asian countries, it has been regarded a main material to compound traditional medicines for invigorating vital energy. In the traditional cultivation of W. cocos, the inoculated pine logs were buried into the soil. Recently, a new shelf cultivation technique using plastic bag packed with pine sawdust and rice bran was developed. In the present study, the alternation of metabolic profiles in W. cocos mycelia cultivated under light and dark conditions was investigated using gas chromatography mass spectrometry (GC-MS) and high performance liquid chromatography (HPLC). We used a commercial strain of W. cocos, Bokryeong 1-ho, preserved in the National Institute of Horticultural and Herbal Science. The GC-MS data showed that the contents of sugars (e.g., trehalose, maltose, and xylitol), proline, and glycerylmonostearate remarkably increase in the light condition, while those of amino acids (e.g., glycine and cystathionine), organic acids (e.g., malic acid and fumaric acid), and some nucleosides increased in the dark condition. Pachymic acid is a natural triterpenoid having antiviral, antitumor and anti-inflammatory properties. Our quantitative estimation of pachymic acid in the both mycelial samples represented that more pachymic acid are produced under the light condition with statistical significance. * These authors contributed equally to this work.
First report of ash dieback pathogen Hymenoscyphus fraxineus (Helotiales, Leotiomycetes) from Korea
Jae-Gu Han,Bhushan Shrestha,Gi-Ho Sung,Kang-Hyo Lee 한국버섯학회 2014 버섯 Vol.18 No.2
In the past two decades, European ash trees (Fraxinus spp.) have been severely damaged by ash dieback disease of which causal agent is a fungal species called Hymenoscyphus fraxineus (anamorphic stage Chalara fraxinea). Recent molecular phylogenetic and population genetic studies suggested that this fungus may have been introduced from Eastern Asia to Europe. In the course of fungal biodiversity survey in Korea, H. fraxineus-like apothecia were collected from fallen leaves, rachis and petioles of Korean ash and Manchurian ash trees. The morphological and ecological traits of these materials are provided, supplemented by ITS rDNA sequence comparison of H. fraxineus strains collected from Europe, China and Japan.