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Hyeonseok Oh,Daeun Yu,Yoon-Ho Choi,Namgi Kim 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.11
With advancements in network technologies, network virtualization has been proposed to efficiently provide a large number of services and flexible management by utilizing limited resources over existing networks as much as possible. Network virtualization has been proposed as a new paradigm for networks, as it simplifies complicated network configurations for convenient maintenance through the maximum utilization of limited network resources. However, problems have arisen due to network virtualization, such as how to assign real network components that are compatible with virtual network components over a large number of virtual machines existing in a network. In particular, the service-chaining concept—where a network flow only passes through needed services—has been newly introduced by combining the recently highlighted Software-Defined Network with a virtualization concept called Network Function Virtualization. As a result, studies on which virtual machines are selected and how to connect them have increased ever more. Accordingly, this paper aims to identify virtual machines that are compatible with service chaining in a virtual network environment where virtual machines are dispersed, and it proposes a method of how to create a path by connecting virtual machines.
Kwon, Oh Seok,Lee, Seung Hwan,Park, Seon Joo,An, Ji Hyun,Song, Hyun Seok,Kim, Taejoon,Oh, Joon Hak,Bae, Joonwon,Yoon, Hyeonseok,Park, Tai Hyun,Jang, Jyongsik WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.30
<P><B>Large‐scale FET‐type graphene micropatten (GM) nano‐biohybrid‐based immunosensor (GMNS)</B> is fabricated in a controlled fashion to detect human immunodeficiency virus 2 antibody. Flexible GMNS shows a highly sensitive response and excellent mechanical bendability. The flexible GMNS in fluidic systems also has a stable response. This is the first experimental demonstration of a large‐scale flexible fluidic FET‐type immunoassay based on GM nano‐biohybrids.</P>
Hyeonseok Yoo,Chulho Lee,Kiseok Oh,Jinsub Choi 한국표면공학회 2016 한국표면공학회지 Vol.49 No.2
The anodization of ADC12 aluminum alloy was investigated in the metal anionic acid media. Anodic oxide films containing foreign elements were formed on ADC12 Al alloy by anodization in the anion complex solution. Furthermore, the rough surface and cracks were considerably smoothened by the deposit of metal anions. When the size of metal anion was small, relatively large amount of metal anions was loaded in anodic films. Existence of MoO₃, TiO₂ and MgO was confirmed by XPS. According to the results of Tafel analysis, Mo oxide represented the most noble anti-corrosion potential due to MoS2 formation. Corrosion current densities were generally higher than that of pristine anodic oxide without anion complexes.
Oh, Wan-Kyu,Kim, Sojin,Yoon, Hyeonseok,Jang, Jyongsik WILEY-VCH Verlag 2010 Small Vol.6 No.7
<P>Poly(3,4-ethylenedioxythiophene) (PEDT) is recognized as one of the most promising conducting polymers for future applications in the fields of electronics, optics, energy storage/conversion, and biomedical science. The toxicity of PEDT could be considered to affect the potential for its widespread application. Herein, the cytotoxicity and proinflammatory response of PEDT nanomaterials of three different shapes toward human lung fibroblast (IMR90) and mouse alveolar macrophage (J774A.1) cells are investigated. The shape-dependent toxicity of the PEDT nanomaterials is evaluated by examining cell morphological change, cytotoxicity, apoptosis/necrosis, oxidative stress, and immune response. The cytotoxicity and apoptosis of the nanomaterials increase with their decreasing aspect ratio in both cell lines. The formation of reactive oxygen species in cells treated with PEDT nanomaterials is dependent on the shape and concentration of the nanomaterial. Proinflammatory cytokines, such as interleukin-1, interleukin-6, and tumor necrosis factor α from macrophages, are induced by PEDT nanomaterial-treated cells.</P> <B>Graphic Abstract</B> <P>The cytotoxicity and immune response of poly(3,4-ethylenedioxythiophene) (PEDT) nanomaterials of three different shapes are evaluated toward human lung fibroblast and mouse alveolar macrophage cells. The PEDT nanomaterial shows shape-dependent toxicity: apoptosis and cytotoxicity increase with decreasing aspect ratio of the nanomaterials in both cell lines. <img src='wiley_img_2010/16136810-2010-6-7-SMLL200902074-content.gif' alt='wiley_img_2010/16136810-2010-6-7-SMLL200902074-content'> </P>
Yoo, Hyeonseok,Oh, Kiseok,Lee, Yu Ri,Row, Kyung Ho,Lee, Gibaek,Choi, Jinsub Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.10
<P><B>Abstract</B></P> <P>The simultaneous doping of RuO<SUB>2</SUB> and IrO<SUB>2</SUB> catalysts into anodic TiO<SUB>2</SUB> nanotubes (NTs) was successfully achieved by single-step anodization. KRuO<SUB>4</SUB> was used as the precursor for the RuO<SUB>2</SUB> dopant. However, for IrO<SUB>2</SUB> doping, IrO<SUB>x</SUB> nanoparticles (NPs) were synthesized from IrCl<SUB>3</SUB> as an intermediate species to avoid damage to the NTs by chloride ions during doping. <SUP> <SUB> IrO 4 </SUB> − </SUP> generated from the IrO<SUB>x</SUB> NPs through selective dissolution in the electrolyte was simultaneously doped into the positively biased TiO<SUB>2</SUB> NTs along with RuO<SUB>2</SUB>. The structural features, NT length, and amount of catalyst doping were controlled by the concentration of HF in the electrolyte and the anodizing time. The binary-catalyst-doped TiO<SUB>2</SUB> NTs exhibited an outstanding onset potential of 0.84 V for the oxygen evolution reaction (OER). In addition, the amount of O<SUB>2</SUB> gas evolved during the OER at 2.0 V was measured to be 230 μmol cm<SUP>−2</SUP> min<SUP>−1</SUP> by gas chromatography, which corresponds to a faradaic efficiency of 99%. The major oxidation states of the metals in the catalysts were found to be Ru<SUP>4+</SUP> and Ir<SUP>4+</SUP> by X-ray photoelectron spectroscopy and transmission electron microscopy selected area electron diffraction analysis, indicating the presence of RuO<SUB>2</SUB> and IrO<SUB>2</SUB> in the TiO<SUB>2</SUB> NTs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TiO<SUB>2</SUB> nanotubes (NTs) including dopants of IrO<SUB>2</SUB> and RuO<SUB>2</SUB> are prepared by single-step anodization. </LI> <LI> The rutile phase of IrO<SUB>2</SUB> and RuO<SUB>2</SUB> is shown into the crystalline TiO<SUB>2</SUB> with even distribution. </LI> <LI> The maximum current density of 94 mA cm<SUP>−2</SUP> is achieved from the IrO<SUB>2</SUB>–RuO<SUB>2</SUB> doped TiO<SUB>2</SUB> NTs for OER performance. </LI> <LI> The evolved oxygen gas amount of 230 μmol exhibits 99% of faradaic efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Binary catalysts are successfully doped into TiO<SUB>2</SUB> nanotubes by single-step anodization process for OER application.</P> <P>[DISPLAY OMISSION]</P>