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A self-encapsulated porous Sb-C nanocomposite anode with excellent Na-ion storage performance
Pham, Xuan-Manh,Ngo, Duc Tung,Le, Hang T. T.,Didwal, Pravin N.,Verma, Rakesh,Min, Chan-Woo,Park, Choong-Nyeon,Park, Chan-Jin The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.41
<P>In this study, a self-encapsulated Sb-C nanocomposite as an anode material for sodium-ion batteries (SIBs) was successfully synthesised using an SbCl3-citrate complex precursor, followed by a drying and calcination process under an inert N2 atmosphere. When the molar ratio of SbCl3 to citric acid was varied from 1 : 1 to 1 : 4, the Sb-C nanocomposite with a molar ratio of 1 : 3 (Sb-C3) exhibited the highest specific surface area (265.97 m<SUP>2</SUP> g<SUP>−1</SUP>) and pore volume (0.158 cm<SUP>3</SUP> g<SUP>−1</SUP>). Furthermore, the Sb-C3 electrode showed a high reversible capacity of 559 mA h g<SUP>−1</SUP> at a rate of C/10 and maintained a high reversible capacity of 430 mA h g<SUP>−1</SUP> even after 195 cycles at a rate of 1C. The Sb-C3 electrode exhibited an excellent rate capability of 603, 445, and 357 mA h g<SUP>−1</SUP> at the rates of C/20, 5C, and 10C, respectively. Furthermore, a full cell composed of an Sb-C3 anode and a Na3V2(PO4)3 cathode exhibited good specific capacity and cyclability, making the Sb-C composite a promising anode material for high-performance SIBs.</P>
이승빈 ( Seung-bin Lee ),이주헌 ( Ju-heon Lee ),이계환 ( Gye-hwan Lee ),전경구 ( Gyeon-gu Jeon ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
우리나라의 차량 범죄률은 국민들의 소득 증가와 더불어 계속해서 증가 중인 추세이다. 현재 상용화된 차량 번호판 인식은 시스템은 특정 위치에 고정되어 있고, 화면의 특정 영역에 물체가 들어와야만 번호판을 인식할 수 있다. 단순히 그 영역에 들어오지 못하면 번호판을 인식하지 못하고 지나치게 된다. 본 연구는 특정 영역에 구애받지 않고 장소, 화면 어디에서든 차량 번호판을 인식할 수 있게 딥러닝 기술을 응용하여 범죄차량을 찾아내는 기법을 제안한다. 또한 서버와 연동시켜 실시간으로 범죄차량의 위치를 파악, 주변 경찰들에게 연락을 주어 빠르게 범죄차량을 검거하는 서비스를 제공한다.
Khoa D. Nguyen,Son H. Doan,Anh N.V. Ngo,Tung T. Nguyen,Nam T.S. Phan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.44 No.-
A metal–organic framework Fe3O(BPDC)3 was synthesized, and used as a productive heterogeneouscatalyst for the direct C–N coupling of azoles with ethers via oxidative C–H activation to produce azolederivatives. The MOF-based catalyst displayed higher catalytic efficiency than many homogeneouscatalysts as well as several MOFs in the transformation. The MOF-based catalyst could be reused manytimes for the synthesis of azole derivatives by the direct C–N coupling of azoles with ethers without anoteworthy deterioration in catalytic efficiency. To the best of our knowledge, this direct C–N couplingreaction was not previously performed in the presence of heterogeneous catalysts.
Nhan Hao, T. V.,Nhu Le, N.,Koh, Meng-Hock,Quang Hung, N.,Ngoc Duy, N.,Pham, Vinh N. T.,Hoang Tung, N. World Scientific Publishing Company 2018 International Journal of Modern Physics E Vol.27 No.6
<P>Nucleon-nucleus (NA) optical potentials are microscopically generated from a fully self-consistent framework of the particle-vibration coupling (PVC), in which the nucleon-nucleon (NN) effective interaction of the Skyrme type is consistently used to describe the Hartree-Fock (HF) mean-field, the small amplitude collective motions of the target, and the particle-collective states coupling. For the first time, a systematic calculation of low-energy NA elastic scattering off a series of doubly closed-shell nuclei is carried out without ad hoc adjusted parameters. Angular distributions obtained using the present optical potentials are in good agreement with the experimental data. This will be a major step forward in the applications of the Skyrme energy-density-functional theory to build up the global microscopic optical potentials, which are expected to be a powerful tool for the study of unstable (exotic) nuclei at low-incident nucleon energies.</P>
Le, Hang T. T.,Ngo, Duc Tung,Didwal, Pravin N.,Fisher, John G.,Park, Choong-Nyeon,Kim, Il-Doo,Park, Chan-Jin The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.7
<P>The solid-state Li-O2 battery is considered an ideal candidate for high-performance energy storage because of its high safety, due to use of non-flammable and non-volatile electrolytes, and high specific energy, as it uses Li metal and O2 gas as active materials. We present an original solid-state Li-O2 cell composed of a Li metal anode, a flexible polymer interlayer, a perovskite-structured Al-doped Li-La-Ti-O (A-LLTO) solid electrolyte, and an integrated cathode in which a porous A-LLTO solid electrolyte frame was covered with a carbon layer and CoO nanoparticles as the catalyst for the cyclic oxygen evolution and reduction reactions. The designed solid-state cell operated safely in pure O2 atmosphere at temperatures from 25 °C to 100 °C and delivered the first discharge capacity from 796 mA h gC+CoO<SUP>−1</SUP> to 4035 mA h gC+CoO<SUP>−1</SUP>, respectively, at a current density of 0.05 mA cm<SUP>−2</SUP>. Notably, at 50 °C, the cell was maintained for 132 cycles under a limited capacity mode of 500 mA h gC+CoO<SUP>−1</SUP> at a high current density of 0.3 mA cm<SUP>−2</SUP>, demonstrating the first step of success towards realizing Li batteries with high energy and cyclability, as well as safety.</P>
Highly dispersive transparency in coupled metamaterials
Thuy, V T T,Tung, N T,Park, J W,Lam, V D,Lee, Y P,Rhee, J Y IOP Publishing 2010 Journal of optics Vol.12 No.11
<P>We investigate the coupling between bright and quasi-dark eigenmodes in a planar metamaterial supporting highly dispersive transparency. The specific design of such a metamaterial consists of a cut wire (CW) and a single-gap split-ring resonator (SRR). Through the numerical simulation and the equivalent-circuit analysis, we demonstrate that the response of the SRR, which is weakly excited by external electric field, plays the role of a quasi-dark eigenmode in the presence of a strongly radiative CW. Furthermore, by extending and relating our study to the trapped mode resonances and the coupling between dark and bright modes, a more comprehensive perspective for the metamaterial realization of highly dispersive transmission and slow-light applications is provided.</P>
Detailed Numerical Study of Cut-wire Pair Structures
이영백,N. T. Tung,J. W. Park,V. D. Lam,W. H. Jang 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
We systematically study the transmission properties of metallic cut-wire pair (CWP) structure,using the transfer-matrix method and the commercial code, CST Microwave Studio. The electric and the magnetic resonances of CWP structure are demonstrated by the effective medium anal-yses. The corresponding effective permittivity and permeability are calculated from the complex scattering parameters by using the standard retrieval procedure. In addition, the dependence of the transmission properties and the resonance frequencies on the periodicities and the shape of CWP are examined. Moreover, the influence of background medium and the properties of the dielectric spacer are also discussed.