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Wireless sensor networks (WSNs) are a useful method to monitor events in atrocious condition environment. Since the sensor nodes usually use battery with limited amount as power supply, prolong lifetime of network is one of the most important challenges in designing and deploying WSNs. Using cluster-based techniques to group nodes into clusters can reduce energy consumption efficiently, prolong network...
To study the trajectory tracking control based on the kinematic model of a 2-wheel differentially driven mobile robot, a variable structure control algorithm is proposed. By using of the backstepping method and virtual feedback parameter with the signum function, a variable structure tracking controller is designed for the mobile robot. The global asymptotic stability of the closed-loop system is...
In this paper we present a moving object tracking method in a multiple camera tracking system using meta-data. The proposed method acquires image sequences from multiple fixed cameras without a priori camera calibration. The tracking is performed based on object's robust characteristics, such as motion, shape, color, and etc. Elements of meta-data and the optimal tracking method are selected at each...
In this paper, we studied a class of particular interval large-scale Lurie indirect control systems by using the decompose technique of large-scale system, and get some sufficient conditions of the robust absolute stability and a series of corollaries. The superiority of this method was shown by an example.
Based on the Newton learning algorithm, a new algorithm for TLS estimation and its application in harmonic detection is presented in this paper. It is shown that the LMS algorithm and constrained Anti-Hebbian algorithm are two examples of the proposed algorithm in this paper. The dynamic performance of the TLS algorithm is better than that of LMS and anti-Hebbian algorithms. And the APF based on TLS...
A method for digital harmonic detecting based on resampling and feedback theory is proposed, and a digital harmonic detecting system is designed. According of feedback theory, the filter can be designed to take the direct current Ip(Iq), and the ip(iq) before the low-pass filter can be resampled based on the resampling theory. Through this digital system the harmonic currents in power system can be...
Abstract This paper presents a new unit layer rate control algorithm for H.264 combining PID controller with linear rate model. In various video coding standards, like MPEG-2, H.263, MPEG-4 and H. 264, it has been reported that the linear rate control algorithm can achieve more accurate and robust rate control. In fact, human is not only sensitive to spatial quality, but also to temporal quality....
With the increasing popularity of various multicast applications, the application of existing multicast congestion control mechanisms to wireless networks, which were designed for wired networks, is a challenging work due to high bit error rate, fading and handover. In this paper, we proposed an expert-control-based multicast congestion control mechanism for wireless networks, termed ECBMCC. In this...
Based on the solution of the linear state equation, the mean square envelope matrix can be obtained for a linear approximation to the controlled nonlinear system, and the transfer rule of mean square envelope matrix for the nonlinear system is discussed. By making of the Taylor expansion, the nonlinear state equation of controlled systems under ideal state is transformed to a set of ordinary differential...
To controlled systems under deterministic and random trade-off state, it is presented by general Langevin gradient equation while dynamic variational rule of the systems is described. The nonlinear differential equation is equivalent to its nonlinear Volterra's integral equation of the second kind, and any order approximate solution of the equation is also obtained, by successive approximation method...
The system in different faulty state can be represented by different model. The multi-model approach based on Bayesian decision is used for fault detection and isolation. The system with different time delay of input, which is regarded as different level of fault, will be detected by this method. The effectiveness of the proposed method will be tested by the Monte Carlo simulations even in the presence...
This paper carried out the research on the problem of control and synchronization of the chaotic system. The controller based on linear couple rules and the theory of parameters estimation was designed for the continuous-time chaos system with unknown parameter and delayed-time property (CTCS-UP-DTP). Meanwhile, the asymptotic stability of the control and synchronization continuous-time chaos system...
Research on the problem of the control and synchronization for a class of continuous-time chaos system with unknown parameter and time-delayed property (CTCS-UP-TP) was investigated. An effective synchronization controlling algorithm combined variable structure control with adaptive parameter estimation was given under the certain hypothetical conditions. At the same time, the realizing principle...
In this paper we introduce a low cost and non-contact eye-gaze tracking system, which is designed for human computer interaction (HCI). The system has little disturbance to the user. Gazing directions are calculated by measuring the relative positions of the Purkinje Image and the pupil based on the corneal reflect method. The system can process gaze directions in real time, distinguish fixations...
Image fusion based on wavelet transform is the most commonly used image fusion method, which fuses the source images' information in wavelet domain according to some fusion rules. But because of the uncertainties of the source images' contributions to the fused image, how to design a good fusion rule to integrate as much information as possible into the fused image becomes the most important problem...
Detection and quantification of dental plaque is very crucial to both patients and their clinicians. However, traditional dental plaque indices used to measure the dental plaque are subjective, semi-quantitative because the measurements rely primarily on the clinician's ability to demarcate or score areas of disclosed plaque using visual examination. To overcome the shortcomings of traditional indices,...
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