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This paper presents a finite element analysis procedure for solving time-periodic magnetic field problems, employing the fixed point method and the vector Jiles–Atherton (J–A) model. To increase the modeling accuracy, multiple sets of the J–A model parameters are used. The convergence performance of the fixed point iteration is improved by calculating the fixed point coefficients of rolling and transverse...
Beacon node placement is the prerequisite for wireless localization, and the quality of placement scheme significantly affects localization accuracy. For a localization system, sufficient coverage and optimal beacon node distribution are required to provide satisfactory localization accuracy in a target area. Since the deployment cost grows with the number of beacon nodes, it is desirable to keep...
A novel high step-up DC-DC converter is proposed in this paper. In this paper, interleaved inductors are utilized to combine with switched capacitors to generate a simple circuit structure. This topology aims to reduce current stress in low-voltage side further, decrease voltage stress in high-voltage side, and to achieve output voltage regulation with a wide range input. The operating principles...
The intelligibility, the definition and the Comfort for digital hearing aids were reduced because of distorting formant of speech resulted by the existing loudness compensation method(LCM). In order to solve these problems, a LCM based on human auditory is proposed in this paper. This method adopts gammatone filter banks which can simulate the auditory model of human ear cochlea. Input signal is divided...
A combinational method for calculation of dynamic parameters of a round rotor synchronous generator in an 80 MVA, 10.5 KV power plant based on synchronous reactance calculation from phasor measurements and using rated value of control room signals is developed in this paper. The results of this analytical method, in comparison with other methods show the efficiency and accuracy of the proposed method.
This paper proposed a reliability evaluation algorithm for distributed generating system based on sequential state duration sampling method. The power output fluctuation of distributed resources, chemical reaction constraint of energy storage device, and the power exchange strategy with the utility grid are taken into consideration. The method produces the time-varied status of all the elements in...
This paper proposes a method to localize an offshore pollutant source in lakes. The concentration of pollutant is measured periodically over time by sensor nodes distributed spatially. The location of the pollutant source is estimated by using unscented Kalman (UKF) spatial-temporal filtering approach when new temporal and spatial concentration measurements are obtained. In simulations, we compare...
Cable-driven parallel robots with flexible spring spine were present to mimic a human neck. The fixed base and moving platform of the robots are connected by cables and a compression spring. The spring serves as cervical spine to support and facilitate the motion of moving platform corresponding to human head. The cables serve as the muscles around human neck to drive the robot. The bending motion...
Node localization of wireless sensor network is a hot topic, but current algorithms of 3D wireless sensor node localization are not accurate enough. In this paper, the DR-MDS algorithm is proposed, DR-MDS algorithm mainly calibrates the coordinates of nodes and the ranging of nodes based on multidimensional scaling, it calculates the distance between any nodes exactly according to the hexahedral measurement,...
In order to overcome the disadvantages of premature and local convergence in the traditional particle swarm optimization (PSO), an improved chaotic PSO algorithm based on adaptive inertia weight (AIWCPSO) is proposed. The initial population is generated by using chaotic mapping appropriately, in order to improve both the diversity of population and the periodicity of particles. The value of the new...
Due to the great damage to widely utilized flexible structures in ocean engineering, vortex-induced vibration (VIV) of such long flexible marine structures is still a hot issue that needs more theoretical research, and CFD techniques become gradually indispensable to study the VIV problem. In this paper, two-dimensional Reynolds-averaged Navier-Stokes (RANS) equations are adopted to investigate transverse...
A variety of measurement methods have been developed to obtain positions of nodes in wireless networks. However, most of existing positioning methods can only use limited types of measurement. These algorithms fail to exploit arbitrary measurement methods to improve the accuracy of positioning. In this paper, we propose a high-accuracy positioning algorithm which can utilize unlimited types of measurement...
Automatic text summarization is an important and useful research area in natural language processing and information retrieval. Most of current approaches for text summarization do not make full use of human reading process. This paper proposes a multi-document scanning mechanism by simulating human reading process. The mechanism simulates human memory of words, association between words and three...
This paper proposes a novel scheme that considers the data hiding with sub sampling and compressive sensing. We utilize the characteristics of compressive sensing, sparsity and random projection, to embed secret data in the observation domain of the sparse image obtained through compressive sensing. The high bit correction rate (BCR) in experiments shows the high accuracy of our proposed method.
Multiple-shot person re-identification tackles the problem to build the correspondences between sets of human images obtained from distributed cameras. It is challenging due to large within-class variations and small between-class differences, caused by the changing of human appearance and environment. Existing methods for addressing this issue include designing the representation to capture the within-set...
Time series analysis is to explain correlation and the main features of the data in chronological order by using appropriate statistical models. Since the past electricity generated sequence in China shows a strong seasonal variations and several values for January are lost in recent years, estimating the missing values is an important task before building a model. This paper will estimate the missing...
This paper presents two wideband fractional-N frequency synthesizers designed in a 0.13-µm CMOS technology for software-defined radio applications. The first synthesizer adopts a quadrature voltage-controlled oscillator (QVCO) with a new phase shifter scheme, which shows better phase noise performance and more stable oscillation. Combining harmonic rejection and single sideband mixing, a harmonic-rejection...
Printed coils design and optimization are crucial and important for wireless power transmission (WPT). Currently the methods to design printed coils are left with a number of choices that each has advantages and disadvantages in different situations. In this paper, both electromagnetic theory analysis and equivalent circuit modeling have been used together in theoretical analysis, design and optimization...
Transition behavior in large deflection of un-symmetrically layered piezoelectric plate under pretension due to lateral load is studied. von Karman plate theory for large deflection is utilized and extended to the case of an un-symmetrically layered plate including a piezoelectric layer. The derived governing equations are simplified by neglecting the arising nonlinear terms for a linear consideration,...
As the electromagnetic measurement while drilling (EMMWD) becomes a popular researching subject, the numerical solution to wire antenna in inhomogeneous media has been the key of the numerical analysis for this technology. In this article, the NMM method is combined with the wire antenna theory for the first time, which is used to solve the Green's function in layered media. With the advantage of...
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