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RISS 인기검색어
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- 저자 : ( Fengyu Yang ) (검색결과 5 건)
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Effect of Graphene/TiO2 (001) Interface on Threshold Voltage and Nonlinearity
Yuehua Dai,Shanshan Gong,Zhisheng Zhong,Fengyu Gao,Feifei Wang,Cheng Ding,Jin Yang,Fei Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
In this work, the threshold voltage (Vth) and nonlinearity (NL) of Graphene (Gra)/TiO2/Gra heterojunction were studied. First, the density functional tight binding (DFTB+) and much more dynamics were used to investigate the IV curves and the resistive switching properties of TiO2 slab and Gra/TiO2/Gra heterojunction. The NL of Gra/TiO2/Gra heterojunction is stronger than that of the TiO2 slab. The Vth of the resistive transition of the heterojunction is larger than that of the TiO2 slab. The tunneling probabilities and the Mulliken atomic population at the Gra/TiO2 interface under different electric fields were calculated by the Cambridge sequential total energy package (CASTEP). Results showed that both the parameters evidently increased under a certain numerical electric field. Finally, the movement of atom in the electric field and the change in the chemical bond were simulated by DFTB+ module. The effect of the Gra/TiO2 interface on Vth and NL was further illustrated. Postponed Vth and improved NL were found at the heterojunction relative to the TiO2 slab due to the presence of the interface barrier. This work provides guidance and reference for design and optimization of TiO2-based selectors.
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( Ying Chen ),( Yangming Ge ),( Wenyuan Wang ),( Fengyu Yang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.4
Heterogeneous wireless sensor networks (HEWSN) is a kind of wireless sensor networks (WSN), each sensor may has different attributes, HEWSN has been widely used in many aspects. Due to sensors are deployed in unattended environments and its resource constrained feature, the design of security and efficiency balanced authentication scheme for HEWSN becomes a vital challenge. In this paper, we propose a secure and lightweight user authentication and key agreement scheme based on biometric for HEWSN. Firstly, fuzzy extractor is adopted to handle the user’s biometric information. Secondly, we achieve mutual authentication and key agreement among three entities, which are user, gateway and cluster head in the four phases. Finally, formal security analysis shows that the proposed scheme defends against various security pitfalls. Additionally, comparison results with other surviving relevant schemes show that our scheme is more efficient in term of computational cost, communication cost and estimated time. Therefore, the proposed scheme is well suitable for practical application in HEWSN.
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Liu Li,Zhe Zheng,Xiao Zhao,Fengyu Wu,Jian Zhang,Zhen-Nai Yang 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
Bacillus methanolicus LB-1 isolated from traditionalrice wine was found to produce a milk clottingenzyme (MCE), and its fermentation conditions wereoptimized using response surface methodology. Then theMCE was produced by ethanol precipitation, and furtherchromatography separation resulted in a 10.46-fold purificationwith a 59.28% recovery. The MCA (milk clottingactivity) of the purified MCE reached 597,310 ± 0.13 SU/g. The optimal temperature of the MCE was determined tobe 50 C and it was stable in the low temperature range of40–45 C. The MCE had an optimum pH of 6.5, and it wasstable under neutral conditions. Calcium chloride at theconcentration of 25 mM was found to be the most effectivestimulus. The MCE was identified by LC–MS to be aputative protein (ID I3EB99) containing 759 amino acidswith a molecular weight of 80.37 kDa and a pI of 9.23.
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Ming, Jun,Wu, Yingqiang,Nagarajan, Srinivasan,Lee, Dong-Ju,Sun, Yang-Kook,Zhao, Fengyu The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.41
<P>In this study, an effective method of slow hydrolization of metal alkoxide (<I>e.g.</I>, Ti(C<SUB>4</SUB>H<SUB>9</SUB>O)<SUB>4</SUB>) in an ethanol–water system was systematically investigated and used to finely control the deposition of titania on carbon colloids. A model of adsorption–hydrolization of precursors during the coating process was rationally built for the first time to interpret the usability of the method and facilitate its further extension. Using this strategy, titania in the form of supported nanocrystals or layers on carbon colloids (TiO<SUB>2</SUB>/C, C@TiO<SUB>2</SUB>) was successfully tailored. Meanwhile, finely dispersed hollow TiO<SUB>2</SUB> nanoparticles with shells consisting of different crystalline structures were also prepared by varying the calcination conditions after removing the carbon cores. More importantly, the effects of the crystalline and nano/macrostructures of the as-prepared TiO<SUB>2</SUB> samples in photocatalysis and lithium-ion battery applications were analyzed in detail. The preliminary results show that anatase–rutile TiO<SUB>2</SUB> hollow particles demonstrate a higher catalytic activity in the photo-degradation of rhodamine B than anatase TiO<SUB>2</SUB> hollow particles, powders, and P25. However, in the case of Li-ion battery applications, the anatase TiO<SUB>2</SUB> hollow particles exhibited better performance as anode materials with high capacities of around 190 mA h g<SUP>−1</SUP>, 140 mA h g<SUP>−1</SUP>, and 120 mA h g<SUP>−1</SUP> at current densities of 60 mA g<SUP>−1</SUP>, 120 mA g<SUP>−1</SUP>, and 300 mA g<SUP>−1</SUP>, respectively, accompanied by stable cyclability.</P> <P>Graphic Abstract</P><P>Fine control of the titania deposition to prepare C@TiO<SUB>2</SUB> composites and TiO<SUB>2</SUB> hollow particles for photocatalysis and lithium-ion battery applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34106a'> </P>
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Ming, Jun,Wu, Yingqiang,Liang, Guanfeng,Park, Jin-Bum,Zhao, Fengyu,Sun, Yang-Kook The Royal Society of Chemistry 2013 Green chemistry Vol.15 No.10
<P>The salt effect of Na<SUB><I>x</I></SUB>A (A = SO<SUB>4</SUB><SUP>2−</SUP>, Cl<SUP>−</SUP>, NO<SUB>3</SUB><SUP>−</SUP>, <I>etc</I>.) on the hydrothermal carbonization of biomass is reported. It is a new catalyst and recyclable template to more simply and effectively prepare carbon-based materials, such as porous carbon-coated anode materials (<I>e.g.</I>, Fe<SUB>3</SUB>O<SUB>4</SUB>@porous-C) in lithium-ion battery applications with enhanced performance.</P> <P>Graphic Abstract</P><P>The sodium salt effect on hydrothermal carbonization of biomass and as a catalyst for carbon-based nanostructured materials for lithium-ion battery applications is reported. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3gc40480c'> </P>
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