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In this paper, an on-board charger for electric vehicle, with two-stage power converter, is designed. Firstly, a single-phase Boost-APFC (Active Power Factor Correction) circuit controlled by a one-cycle controller is designed as the front state converter. Compared to the traditional APFC circuit, the One-cycle controller is constructed without considering the multiplier and AC line voltage sensing...
Based on the very old methods of solving of simultaneous linear congruences, the Chinese Remainder Theorem is still a irreplaceable tool for the Computing, the Signal Processing and the Information Security. We present this potentiality, in a example of application concerning the quaternionic imaging.
In order to study the radiation characteristics of the airborne VHF antenna, the model of the knife-type antenna was achieved by FEKO. Using MoM analyzed the radiation characteristics of the antenna in free space and using MLFMM analyzed the radiation characteristics of the airborne antenna. By comparing the VSWR and radiation pattern of the knife-type antenna in free space and in airborne state,...
One open problem for wireless communication in the high-speed railway environment is channel capacity. In this paper, we study the problem of ergodic capacity for the time-selective and frequency-selective wireless channels in the high-speed railway environment. Firstly, we build up the channel model for the wireless communication between mobile users on the high-speed train and the base station along...
Based on the features of GPU architecture, this paper introduces CUDA into an existing Euler solver software for a 3-D Cartesian grid. Theories and Techniques used to solve the equations with finite volume methods using an explicit scheme are described. Two versions of GPU-based Cart Solver are implemented and optimized. For a real and complex model, the implementation on a NVIDIA GTX460se GPU by...
Chinese government has transformed the function of economy-construction-type to public-service-type under the guidance of scientific concept of development. The transformation of government functions undoubtedly require public spending structure also make corresponding changes. The purpose of the paper is to identify and verify what changes have taken in public expenditure structure of Fujian province...
Network on chip (NoC) mapping problem belongs to quadratic assignment problem, and quadratic assignment problem is a classical combinatorial optimization problem which has been proved to be a NP-complete problem. In this paper, the widely used 2D-mesh as a NoC topology is studied, and the important factors influencing the performance of the system-power consumption and delay are modeled. Then the...
The harmonic balance method is applied to study the DC bias phenomenon of the power transformer in frequency domain. The harmonic balance equation has been set up, establishing the electromagnetic coupling model. Every frequency solution of the exciting current and the magnetic flux can be calculated by updating the reluctance in iterative computation. A single-phase two-limb core model is employed...
A major difficulty affecting the control of product quality in industrial polymerization reactors is the lack of suitable on-line polymer property measurements. In this article, a parameter updating law is deduced based on the predictive model of industrial polyethylene process resin quality. According to the off-line lab analytical data, an asymptotic tracking state observer design method is proposed...
Since the grid structure of 10kV distribution network has always been in a complex and chaotic state, this paper did some research to effectively standardize it. Firstly, the backbone grid and the secondary grid of 10kV distribution network are presented and defined. Then, based on the grid structure and functional characteristics of secondary grid, three types of analysis models are established to...
In our previous work, a node self-localization algorithm based on virtual central node (VCN) for wireless sensor network (WSN) is proposed. This method is adapted to WSN that anchor nodes present a uniform distribution in three dimensional spaces. During the localization process, by deducing a 3D special node, which is called virtual central node, unknown nodes can compute their own positions automatically...
An improved iterative algorithm is presented in this paper for solving finite difference approximation to elliptic equations. This algorithm is based on fourth order finite difference scheme and has obvious property of parallelism. The convergence theory is discussed in detail. Numerical experiments show that the new algorithm has faster convergence rate and higher accuracy than Jacobi method, the...
Bayesian network is an uncertainty inference network based on probability. Its structure learning is one of the main research techniques in the field of data mining and knowledge discovering, while constructing Bayesian network structures from data is NP hard. According to the information theory and conditional independence test, a new algorithm is presented for the construction of optimal Bayesian...
Numerical solutions of quasi-stationary ring-spinning equations have been extensively investigated after the appearance of computer. However, mathematicians and engineers are more willing to obtain analytical solutions. This paper presents a technique for analytical solution of the dynamics of ring-spinning balloon. Artificial parameter is introduced in order to be used as an expanding parameter....
In this paper, a new algorithm is proposed to compute the special positive definite solution which is the unique solution of a special matrix equation. The new algorithm outperforms the existing algorithms for solving the matrix equation in computational costs.
In this paper, Network Coding (NC) Theory is introduced to improve efficiency of the traditional ARQ scheme for Cognitive Radio (CR) broadcast, named as NC-ARQ, in which we consider making the CR basestation combine the lost packets during ARQ broadcast retransmission in CR networks (CRN), with the changeable availability of CR channel. The Broadcast Cost is defined to indicate and compare the theoretic...
Enterprise Resource Planning (ERP) projects have often been found to be costly, complex, and risky to implement in enterprises. Therefore, understanding ERP implementation risks can help reduce the failure of ERP projects. The aim of this study was to explore two questions: (1) Do the six risk dimensions (planning & control, requirement, organization environment, user, team, and project complex)...
Mandarin objective assessment plays a very important role in the speech assessment. It still has a long way to go before it reaches the level of success. In this paper, the novel mandarin objective assessment based on Support Vector Machine (SVM) is proposed. The mandarin pronunciation is divided into consonant, vowel and tone. And the feature parameters of pronunciation are surveyed. The experimental...
In order to remove the human factors improve efficiency and save the cost, National Mandarin Proficiency Test (NMPT) based on computer-aided is expected urgently. The feature parameter extraction is the most important part in the objective assessment of the Mardarin. In this paper we focus on the optimization of artificial neural network by PSO for Mandarin speech recognition. A framework of the Mandarin...
To deal with the feature of various influencing factors of profit allocation, an evaluation method based on grey relational analysis is developed. When this method is used, evaluation index matrix of cooperative enterprise in supply chain is constructed by analysis and statistics of the influencing factors of profit allocation. Then, a judging matrix is established and solved through the calculation...
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