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In a cognitive radio system, proper configuration of sensing duration enables maximization of the data throughput. However, no existing straightforward formula is available, which is desirable in the mobile context due to tightness of computation time. A set of closed-form approximate formulae of optimal sensing duration for cognitive radio are derived under different signal to noise ratio (SNR)....
Smoke environment is a common condition during the fire-fighting operation, and the change of lighting's illuminating effect in the smoke environment is the issue concerned by fire department and lighting manufacturer. According to this issue, a development on lighting's smoke penetrability performance test device was conducted, and by this device an illumination change test was made for three types...
This paper proposed a novel battery energy storage system based on modular multilevel converter (MMC), which has several merits compared with two-level and cascaded multilevel battery energy storage systems. The proposed system can manage the state-of-charges (SOCs) of all batteries to be equal to avoid the overcharge or over discharge of single battery stack as traditional. Besides, the inherent...
This paper investigates the problem of stabilizing a class of time-varying nonlinear sampled-data systems whose parameters do not change sharply with time. Given this type of sampled-data systems, we make use of the approximate model of the time-varying system at each sampling instant in designing a controller, which can stabilize the exact discrete-time model of the plant under any sufficiently small...
Recent years have witnessed the increased interests in exploiting influence in social networks for many applications. To the best of our knowledge, from the computational aspect of social influence analysis, most of existing work focus on either describing the influence propagation process or identifying the set of most influential seed nodes. However, these work usually do not distinguish the "independent...
In the vehicle routing problem (VRP), it is usually difficult to confederate the cargo and arrange vehicles path. Due to performance reasons, the traditional shortest path algorithm can not be applied to the large scale of VRP. On the basis of the VRP mathematical model, this paper constructs a mixed climbing particle swarm algorithms to solve the problem. First, through coding, the VRP problem is...
Recommender system plays an important role in modern Electronic Commerce. An excellent recommender system is the key to make electronic commerce network run well. But now because of many reasons most recommend effects are not good enough. So a recommender system based on Improved K-means Clustering Algorithm (IKCA) is designed and implemented in this paper. The whole system includes user clustering...
Consider the parametric excitation, studied the characteristics of fifth nonlinear duffing chaotic system. By applying geometric theory of dynamical systems, bifurcation theory and infinitesimal calculus, obtain the homoclinic orbit of fifth duffing equation. Using Melnikov method determines the initial chaotic condition of system and perturbation equation. By means of numerical calculation and computer...
Trip planning is generally a very time-consuming task due to the complex trip requirements and the lack of convenient tools/systems to assist the planning. In this paper, we propose a travel path search system based on geo-tagged photos to facilitate tourists' trip planning, not only for where to visit but also how to visit. The large scale geo-tagged photos that are public ally available on the web...
In this paper, an aluminum plate with a Peltier devices are used as a model. For the Peltier actuated thermal process is a nonlinear control affine system and the real system is usually contains fault owing to various factors, it is difficult to achieve excellent control consequent. In this paper, robust right coprime factorization is applied to analyse the thermal process. Then the derivation of...
Based on spectrum correlation of Multi-section Sinusoids with the Known Frequency-Ratio (hereinafter referred as MSKFR), a frequency estimation algorithm was proposed. This algorithm aims at improving frequency estimation of the short sinusoid at low Signal-to-Noise Ratio(SNR), and extending the applicable range of the multi-section signals fusion method. Firstly, an easy way to get MSKFR in application...
A novel motion compensation (MoCo) algorithm for high resolution (HR) spotlight SAR imagery is proposed. It is capable of correcting both phase error and range cell migration (RCM) in the post-PFA data domain. It is a robust way to estimate phase error by Map-drift (MD) method, including range-invariant and range-variant ones. What is more, the random characteristic of RCM is also taken into consideration...
This study will investigate whether current economic activities in china have explanatory power over stock returns, or not. Monthly data of Shanghai Securities Exchange Composite Index and a set of macroeconomic variables, including money supply (M2), Value-added of industry (VAI), are used in this study. Engel-Granger, Johansen-Juselius co-integration tests and Granger Causality test are used to...
This article analyzed IPO data of China's 561 companies in SME board and 186 companies in GEM board, and claimed that the new IPO system implemented in June 2009 provided opportunity for high-priced, high price-earnings ratio IPO. Underwriters and the former major shareholders became the beneficiaries and the largest driving force because of their profit-driven behavior. In the current external environment,...
This paper analyzes the relation among the accumulation of human capital, economic growth and social harmony in rural China based on a cointegration analysis and Granger causality test model. The analysis demonstrates equilibrium among them in the long periods. In the short periods economic growth and social harmony will change 0.48 and 2.38 separately if human capital accumulation in rural China...
In this paper, we aim at studying the laws of heat, moisture and air transfer in the respirable walls. We developed a coupled unstable equation system of the heat, air and moisture transfer in the respirable walls with the third boundary condition. Because equal equation systems are a series of non-linearity equations, which include differential items, finite difference is adopted to solve the equation...
A class of reference signal based (RSB) beamforming algorithms is proposed based on a symmetrically distributed array (SDA) by constraining its weight vector to a specific conjugate symmetric form, which is derived from the beamformer with a minimum mean square error (MSE). The effect of the additional constraint is equivalent to adding a second step in the derived adaptive algorithms. Moreover, since...
A new method for front wheel alignment parameters design of mine truck is afforded. In the design, tire wear and handling performance are considered. The candle-suspension and unite steering mechanism is adopted in the truck. The response surface method is applied by the second-order approximation model between alignment parameters and optimization objective. The controlled factors are included in...
The structural feature extraction from regular-shaped rigid objects is studied. First, some specific measures for facilitating the conventional Randomized Hough Transform (abbr. RHT) in our application are introduced. Then, a gradient direction constraint RHT is proposed for improving the poor performance of the conventional RHT that too much false response happens in noisy real images. The basic...
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