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Choi, Jonghoon,Oh, Hana,Han, Sang-Wook,Ahn, Seokhoon,Noh, Jaegeun,Park, Joon B. ELSEVIER 2017 Current Applied Physics Vol.17 No.2
<P>A highly efficient synthetic route was successfully developed to prepare crystallized and well dispersed Cu, Cu2O, and CuO nanoparticles (NPs) on reduced graphene oxide (rGO) by controlling the impregnation condition of a copper-precursor (Cu(NO3)(2)center dot 3H(2)O) on graphene oxide (GO) and subsequent thermal treatments. The morphological and chemical structures of the nanocomposites were systemically evaluated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), and transmission electron microscopy (TEM). The rGO based CuOx nanocomposites exhibited a much higher catalytic activity than bare CuOx NPs toward the decomposition reaction of dye molecules under visible light illumination. Among the CuOx/rGO nanocomposites, CuO/rGO showed excellent photocatalytic efficiency and recyclability without significant loss of activity. Based on the XPS, XRD, XAFS, and TEM results, the high photocatalytic efficiency of the CuO/rGO can be attributed to the synergistic combination of dye adsorptivity and electron acceptability of the rGO, the surface hydroxyl species in the CuO/rGO, and the narrow band gap and smaller size of the CuO NPs. This work could be applied to the removal and water treatment of waste dye. (C) 2016 Elsevier B.V. All rights reserved.</P>
Ko, Young-Joon,Lee, Hyang-Sim,Jeoung, Hye-Young,Heo, Eun-Jeong,Ko, Hyo-Rim,Chang, Byung-Sik,Joo, Hoo-Don,Gerelmaa, U.,Dashzeveg, B.,Tserendorj, S.,Sodnomdarjaa, R.,Park, Jong-Hyeon,Kweon, Chang-Hee,Ch American Society for Microbiology 2010 CLINICAL AND VACCINE IMMUNOLOGY Vol.17 No.1
<B>ABSTRACT</B><P>A blocking enzyme-linked immunosorbent assay (ELISA) with a baculovirus-expressed structural protein was developed for the detection of antibodies to foot-and-mouth disease virus type A. It exhibited 99% specificity with a cutoff of 53% inhibition. Its sensitivity was comparable to the sensitivities of the virus neutralization test and the liquid-phase blocking ELISA, indicating its potential as an alternative assay.</P>
Jo, Guk Heui,Bö,gler, Oliver,Chwae, Yong-Joon,Yoo, Heon,Lee, Seung Hoon,Park, Jong Bae,Kim, Youn-Jae,Kim, Jong Heon,Gwak, Ho-Shin Korean Cancer Association 2015 Cancer Research and Treatment Vol.47 No.2
<P><B>Purpose</B></P><P>Radiation-induced autophagy has been shown to play two different roles, in malignant glioma (MG) cells, cytocidal or cytoprotective. However, neither the role of radiation-induced autophagy for cell death nor the existence of autophagy-induced apoptosis, a well-known cell-death pathway after irradiation, has been verified yet.</P><P><B>Materials and Methods</B></P><P>We observed both temporal and dose-dependent response patterns of autophagy and apoptosis to radiation in MG cell lines. Additionally, we investigated the role of autophagy in apoptosis through knockdown of autophagy-related proteins.</P><P><B>Results</B></P><P>Autophagic activity measured by staining of acidic vesicle organelles and Western blotting of LC-3 protein increased in proportion to radiation dose from day 1 to 5 after irradiation. Apoptosis measured by annexin-V staining and Western blotting of cleaved poly(ADP-ribose) polymerase demonstrated relatively late appearance 3 days after irradiation that increased for up to 7 days. Blocking of pan-caspase (Z-VAD-FMK) did not affect apoptosis after irradiation, but silencing of Atg5 effectively reduced radiation-induced autophagy, which decreased apoptosis significantly. Inhibition of autophagy in Atg5 knockdown cells was shown to be beneficial for cell survival. Stable transfection of GFP-LC3 cells was observed after irradiation. Annexin-V was localized in cells bearing GFP-LC3 punctuated spots, indicating autophagy in immunofluorescence. Some of these punctuated GFP-LC3 bearing cells formed conglomerated spots and died in final phase.</P><P><B>Conclusion</B></P><P>These findings suggest that autophagy appears earlier than apoptosis after irradiation and that a portion of the apoptotic population that appears later is autophagy-dependent. Thus, autophagy is a pathway to cell death after irradiation of MG cells.</P>
Park, Suk Won,Han, Gwon Deok,Choi, Hyung Jong,Prinz, Fritz B.,Shim, Joon Hyung Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.441 No.-
<P><B>Abstract</B></P> <P>This study evaluated the effectiveness of alumina fabricated by atomic layer deposition (ALD) as a protective coating for silver articles against the corrosion caused by body contact. An artificial sweat solution was used to simulate body contact. ALD alumina layers of varying thicknesses ranging from 20 to 80 nm were deposited on sputtered silver samples. The stability of the protective layer was evaluated by immersing the coated samples in the artificial sweat solution at 25 and 35 °C for 24 h. We confirmed that a sufficiently thick layer of ALD alumina is effective in protecting the shape and light reflectance of the underlying silver, whereas the uncoated bare silver is severely degraded by the artificial sweat solution. Inductively coupled plasma mass spectrometry and X-ray photoelectron spectroscopy were used for in-depth analyses of the chemical stability of the ALD-coated silver samples after immersion in the sweat solution.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ALD Al<SUB>2</SUB>O<SUB>3</SUB> is effective in protecting the shape and light reflectance of Ag. </LI> <LI> An artificial sweat solution is used to evaluate the stability of ALD Al<SUB>2</SUB>O<SUB>3</SUB>-Ag. </LI> <LI> Uncoated bare Ag severely degraded by the artificial sweat solution. </LI> <LI> ICP-MS and XPS confirm no Ag dissolution or diffusion of Na/Cl ions through Al<SUB>2</SUB>O<SUB>3</SUB>. </LI> </UL> </P>
박준범 ( Joon B Park ) 전북대학교 과학교육연구소 2012 과학과 과학교육 논문지 Vol.37 No.-
Since the invention of the scanning tunneling microscopy (STM) by G Binning and H Rohrer in 1982 this imaging technique has made a dramatic impact in fields as diverse as material science semiconductor physics biology electrochemistry surface chemistry and catalysis. The main reason for this huge influence of STM in science is that it provides three-dimensional (3-D) real space images of a surface with atomic scale resolution and allows for spatially localized spectroscopic measurements of surface structures. In this paper basic principle of STM its spectroscopic applications and STM tip-fabricating methods will be discussed.
MEMS-based thin-film solid-oxide fuel cells
An, Jihwan,Shim, Joon Hyung,Kim, Young-Beom,Park, Joong Sun,Lee, Wonyoung,Gü,r, Turgut M.,Prinz, Fritz B. Cambridge University Press (Materials Research Soc 2014 MRS bulletin Vol.39 No.9
<▼1><B>Abstract</B><P/></▼1><▼2><P>Thin-film solid-oxide fuel cells (TF-SOFCs) fabricated using microelectromechanical systems (MEMS) processing techniques not only help lower the cell operating temperature but also provide a convenient platform for studying cathodic losses. Utilizing these platforms, cathode kinetics can be enhanced dramatically by engineering the microstructure of the cathode/electrolyte interface by increasing the surface grain-boundary density. Nanoscale secondary ion mass spectrometry and high-resolution transmission electron microscopy studies have shown that oxygen exchange at electrolyte surface grain boundaries is facilitated by a high population of oxide-ion vacancies segregating preferentially to the grain boundaries. Furthermore, three-dimensional structuring of TF-SOFCs enabled by various lithography methods also helps increase the active surface area and enhance the surface exchange reaction. Although their practical prospects are yet to be verified, MEMS-based TF-SOFC platforms hold the potential to provide high-performance for low-temperature SOFC applications.</P></▼2>
( Young Joon Hong ),( Myung Ho Jeong ),( Seung Hyun Lee ),( Ok Young Park ),( Ju Han Kim ),( Weon Kim ),( Jay Young Rhew ),( Young Keun Ahn ),( Jeong Gwan Cho ),( Jong Chun Park ),( Soon Pal Suh ),( B 대한내과학회 2003 The Korean Journal of Internal Medicine Vol.18 No.3
Background: Antithrombotic therapy with heparin reduces the rate of ischemic events in patients with acute coronary syndrome. Low-molecular-weight heparin, given subcutaneously twice daily, has a more predictable anticoagulant effect than standard unfract
The Study on Development of PV-ES hybrid system for Mongolian Household
Battuvshin.B,Turmandakh.B,Joon Hyung Park(박준형),Bayasgalan. D 대한전기학회 2017 전기학회논문지 Vol.66 No.12
In recent years, Ulaanbaatar, a capital of Mongolia has witnessed major problem that air quality reaches hazardous level during the winter season. Coal combustion for heating of every house in “Ger” district is main reason. One way to reduce the air pollution is mass usage of electric heater. However, there are several difficulties such as overload and degradation of transformers and other equipment used in distribution and transmission systems as well as power shortage occurrence in evening peak period due to residential consumption. This study aims to contribute for solving the air pollution and power shortage problem in Mongolia. One possible solution could be distributed generation (DG) with photovoltaic (PV) penetration. In this study, PV with energy storage (ES) hybrid system to reduce peak load is analyzed. We proposed the suitable structure of PV-ES hybrid for Mongolian household, and suggested several operation scenarios. Optimal operation algorithm is carried out based on a comparison aspect from economical, grid impact and PV penetration possibility. The economic analyse shows annual income of 520USD, and has a payback period of 8 years for selected scenario. The proposed PV-ES system structure is verified by experimentation set on the building rooftop in city center. The suggested scenario is planned to apply for system in further research.