Kwangwoon University

About: Kwangwoon University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Thin film & Resonator. The organization has 4020 authors who have published 8217 publications receiving 104365 citations.

Recyclable Ag-coated Fe3O4@TiO2 for efficient photocatalytic oxidation of chlorophenol

Abstract: In this study, a facile and efficient approach for fabricating Ag-coated Fe3O4@TiO2 particles with a good core–shell structure is demonstrated. The synthetic protocol involves coating successive layers of TiO2 nanoparticles onto a magnetic core using a sol-gel method at low temperature, followed by the deposition of silver nanoparticles on the surface of the Fe3O4@TiO2 particles through chemical reduction. The Ag-coated Fe3O4@TiO2 magnetic photocatalyst exhibited high photocatalytic activity in the degradation of Rhodamine B under visible light. Moreover, the Ag-coated Fe3O4@TiO2 photocatalyst showed enhanced photocatalytic properties when compared with a previous report concerning the oxidation of 2,4,6-trichlorophenol in aqueous solution. The renewable photocatalytic activity of the photocatalyst was also examined.

Human Factor Research on the Measurement of Subjective Three Dimensional Fatigue

Abstract: The methods developed to measure visual fatigue so far are quite few and lack of validity, and more importantly, they do not figure out the complex properties of the visual fatigue. The purpose of the research was to analyze the factors comprising the visual fatigue and to develop the method to measure it validly. The results are summarized as follows. First, we found that the 3D visual fatigue was comprised of four independent factors (visual stress, eye pain, body pain and image blurring factors). Second, we developed 29 items that measure four factors of 3D visual fatigue. Finally, the watching duration and binocular disparities affected the visual fatigue as had been expected. These results imply that the developed method does measure the three dimensional fatigue validly.

A novel route for immobilization of proteins to silica particles incorporating silaffin domains

Abstract: In the diatom Cylindrotheca fusiformis, modified peptides called silaffin polypeptides are responsible for silica deposition in vivo at ambient conditions. Recently, it was discovered that the synthetic R5 peptide, the repeat unit of silaffin polypeptide without post-translational modification, was capable of precipitating silica in vitro and at ambient conditions. Herein, chimeric proteins were generated by incorporating synthetic silaffin R5 peptides and related unmodified silaffin domains (R1–R7) from Cylindrotheca fusiformis onto green fluorescent protein (GFP) by recombinant DNA technology and their ability to cause silicification was also examined. GFP chimeric proteins showed silicification at very low concentrations (600–700 μg/mL) when compared with adding excess amounts of R5 peptides (10 mg/mL) as previously reported. Sensitive to pH conditions, only the GFP-R1 chimera showed silicification activity at pH 8.0. The protein immobilization efficiencies of these chimeras were unexpectedly high ranging from 75 to 85%, with the R1 silaffin-protein construct showing excellent immobilization efficiency and a constant molar ratio of silica to protein ranging from 250 to 350 over a wide pH range. The average silica particle sizes had a tendency to decrease as pH increased to basic conditions. This study demonstrated the production of nanoscale immobilized protein, fabricated via silaffin-fused proteins. © 2009 American Institute of Chemical Engineers Biotechnol. Prog., 2009