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Super-potentials, densities of currents and number of periodic points for holomorphic maps
Dinh, Tien-Cuong,Nguyê,n, Viê,t-Anh,Vu, Duc-Viet Elsevier 2018 Advances in mathematics Vol.331 No.-
<P><B>Abstract</B></P> <P>We prove that if a positive closed current is bounded by another one with bounded, continuous or Hölder continuous super-potentials, then it inherits the same property. There are two different methods to define wedge-products of positive closed currents of arbitrary bi-degree on compact Kähler manifolds using super-potentials and densities. When the first method applies, we show that the second method also applies and gives the same result. As an application, we obtain a sharp upper bound for the number of isolated periodic points of holomorphic maps on compact Kähler manifolds whose actions on cohomology are simple. A similar result still holds for a large class of holomorphic correspondences.</P>
Adaptive sliding mode control with backstepping technique for hydraulic manipulator
Duc-Thien Tran,Hoai Vu Anh Truong,Xuan Dinh To,Bomoon Seo,Kyoung Kwan Ahn 제어로봇시스템학회 2018 제어로봇시스템학회 국내학술대회 논문집 Vol.2018 No.5
In this paper, an adaptive sliding mode control with backstepping technique is proposed regarding to controlling position of a hydraulic manipulator in joint space. The proposed control is developed based on sliding mode control, backstepping technique, and radial basis function neural network (RBFNN). In the hydraulic manipulator, the primary torques are generated by hydraulic actuators, so it helps to extend load carrying capacity of the manipulator. But it brings some challenges, such as coupling issues, uncertainties in parameter, modeling, and external disturbance in mechanical and hydraulic dynamics. The properties of the proposed control can deal to these problems to guarantee the stability requirements and improve the precision. The sliding mode control with backstepping technique is used to handle the coupling issues and to ensure the stability and robustness. Additionally, two adaptive approximators based on RBFNN compensate the uncertainties and improve the precision. Some simulations are implemented and compared to other controllers to exhibit the effectiveness of the proposed control.
Nonlinear dynamic response and vibration of nanocomposite multilayer organic solar cell
Duc, Nguyen Dinh,Seung-Eock, Kim,Quan, Tran Quoc,Long, Dang Dinh,Anh, Vu Minh Elsevier 2018 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.184 No.-
<P><B>Abstract</B></P> <P>In the recent years, organic solar cell (OSC) has attracted much interest of the research community due to its great promise as renewable sources. This paper presents the first analytical approach to investigate the nonlinear dynamic response and vibration of imperfect rectangular nanocompsite multilayer organic solar cell subjected to mechanical loads using the classical plate theory. Nanocompsite organic solar cell consists of five layers of Al, P3HT:PCBM, PEDOT:PSS, IOT and glass. Motion and compatibility equations are derived using the classical plate theory and taking into account the effects of initial geometrical imperfection and geometrical nonlinearity in Von Karman – Donnell sense. The Galerkin method and fourth – order Runge – Kutta method are used to give explicit expressions of natural frequencies, nonlinear frequency – amplitude relation and nonlinear dynamic responses of nanocompsite organic solar cell. The numerical results show the influences of geometrical parameters, the thickness of layers, imperfections, and mechanical loads on the nonlinear dynamic response and nonlinear vibration of nanocompsite organic solar cell.</P>
Do Quang Chan,Pham Dinh Nguyen,Vu Dinh Quang,Vu Thi Thuy Anh,Nguyen Dinh Duc 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.31 No.3
This study deals with the nonlinear static analysis of functionally graded carbon nanotubes reinforced composite (FG-CNTRC) truncated conical shells subjected to axial load based on the classical shell theory. Detailed studies for both nonlinear buckling and post-buckling behavior of truncated conical shells. The truncated conical shells are reinforced by single-walled carbon nanotubes which alter according to linear functions of the shell thickness. The nonlinear equations are solved by both the Airy stress function and Galerkin method based on the classical shell theory. In numerical results, the influences of various types of distribution and volume fractions of carbon nanotubes, geometrical parameters, elastic foundations on the nonlinear buckling and post-buckling behavior of FG-CNTRC truncated conical shells are presented. The proposed results are validated by comparing with other authors.
Delay-Constrained Energy-Efficient Cluster-based Multi-Hop Routing in Wireless Sensor Networks
Huynh, Trong-Thua,Dinh-Duc, Anh-Vu,Tran, Cong-Hung The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
Energy efficiency is the main objective in the design of a wireless sensor network (WSN). In many applications, sensing data must be transmitted from sources to a sink in a timely manner. This paper describes an investigation of the trade-off between two objectives in WSN design: minimizing energy consumption and minimizing end-to-end delay. We first propose a new distributed clustering approach to determining the best clusterhead for each cluster by considering both energy consumption and end-to-end delay requirements. Next, we propose a new energy-cost function and a new end-to-end delay function for use in an inter-cluster routing algorithm. We present a multi-hop routing algorithm for use in disseminating sensing data from clusterheads to a sink at the minimum energy cost subject to an end-to-end delay constraint. The results of a simulation are consistent with our theoretical analysis results and show that our proposed performs much better than similar protocols in terms of energy consumption and end-to-end delay.
Nguyen Thi Thuy,Phuong Dinh Tam,Mai Anh Tuan,Anh-Tuan Le,Le Thi Tam,Vu Van Thu,Nguyen Van Hieu,Nguyen Duc Chien 한국물리학회 2012 Current Applied Physics Vol.12 No.6
The present paper introduces a facile and cost-effective route for the direct dispersion of multi-walled carbon nanotubes (MWCNTs) in DNA solution. Their application in detecting Escherichia coli O157:H7using DNA biosensorwas demonstrated. The dispersion state of theMWCNTswas characterized via UVeVis spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The interaction between DNA sequence and the MWCNTs was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. As-obtainedMWCNT solutionwas used in the preparation of DNA sensor. Results revealed that the developed DNA sensor can detect a DNA target as low as 1 nM in a buffer solution. The sensitivity of the DNA sensor reached approximately 0.19 nM/mV. The effect of dispersion parameters, including pH values, DNA concentration, ion strength, and sonication time, on sensor response was also studied. TheDNA sensor can respondwell to 120 min of sonication time, a pH value of 9, and 20 mM of DNA sequence concentration. The results of the present study showed a potential application of the DNA sensor in the detection of Escherichia coli O157:H7.
Delay-Constrained Energy-Efficient Cluster-based Multi-Hop Routing in Wireless Sensor Networks
Trong-Thua Huynh,Anh-Vu Dinh-Duc,Cong-Hung Tran 한국통신학회 2016 Journal of communications and networks Vol.18 No.4
Energy efficiency is the main objective in the design of awireless sensor network (WSN). Inmany applications, sensing datamust be transmitted fromsources to a sink in a timelymanner. Thispaper describes an investigation of the trade-off between two objectivesinWSN design: minimizing energy consumption and minimizingend-to-end delay. We first propose a new distributed clusteringapproach to determining the best clusterhead for each clusterby considering both energy consumption and end-to-end delayrequirements. Next, we propose a new energy-cost function and anew end-to-end delay function for use in an inter-cluster routingalgorithm. We present a multi-hop routing algorithm for use indisseminating sensing data from clusterheads to a sink at the minimumenergy cost subject to an end-to-end delay constraint. Theresults of a simulation are consistent with our theoretical analysisresults and show that our proposed performs much better thansimilar protocols in terms of energy consumption and end-to-enddelay.
Dual-band isotropic metamaterial absorber based on near-field interaction in the Ku band
The Linh Pham,Hong Tiep Dinh,Dinh Hai Le,Xuan Khuyen Bui,Son Tung Bui,Hong Luu Dang,Anh Duc Phan,Dac Tuyen Le,Dinh-Lam Vu 한국물리학회 2020 Current Applied Physics Vol.20 No.2
We numerically and experimentally investigate single-band and dual-band isotropic metamaterial absorbers (IMAs) based on metallic disks. By optimizing the diameter of the metallic disks and the thickness of the dielectric substrate, the single-band IMA is observed at 16.2 GHz with absorptivity of 97%. When adding one diskpair to the structure, the dual-band IMA is obtained at 12.8 and 15.5 GHz due to the symmetry breaking. The physical mechanics is explained by near-field coupling effect and equivalent LC circuit model. The measurement results performed in the range 12–18 GHz show a good agreement with simulation and theoretical analysis. Our findings demonstrate a new approach to achieve dual-band and multi-band IMAs.
Thanh-Tung Duong,Ta Quoc Tuan,Dang Viet Anh Dung,Nguyen Van Quy,Dinh-Lam Vu,Man Hoai Nam,Nguyen Duc Chien,윤순길,Anh-Tuan Le 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Polyaniline nanowires (PANI NWs) were deposited onto fluorine-doped tin oxide (FTO) glass substrate using the cyclic voltammetric method with aniline monomer precursor in HCl aqueous solution. The secondary oxidation peak plays an important role in polymerization of aniline monomer and the optimization of catalytic activity of PANI-based counter electrodes was achieved by controlling the number of cycles. The photovoltaic performance of the dye-sensitized solar cells (DSSCs) with PANI NWs counter electrodes (CEs) was optimized at 4th cycles, and then following parameters were obtained: Jsc ¼ 17.2 mA cm2, Voc ¼ 0.71 V, FF ¼ 59.3%, and efficiency (h) ¼ 7.24%. While, Jsc ¼ 14.7 mA cm2, Voc ¼ 0.77 V, FF ¼ 70.6%, and efficiency (h) ¼ 7.98% in cells with Pt CEs. The PANI NWs were attractive as an alternative CEs for the low-cost DSSCs instead of Pt.