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ABSTRACT: Model predictive control (MPC) could not be reliably applied to real-time control systems because its computation time is
not well defined. Implemented as anytime algorithm, MPC task allows computation time to be traded for control performance,
thus obtaining the predictability in time. Optimal feedback scheduling (FS-CBS) of a set of MPC tasks is presented to maximize
the global control performance subject to limited processor time. Each MPC task is assigned with a constant bandwidth server
(CBS), whose reserved processor time is adjusted dynamically. The constraints in the FS-CBS guarantee scheduler of the total
task set and stability of each component. The FS-CBS is shown robust against the variation of execution time of MPC tasks
at runtime. Simulation results illustrate its effectiveness.
Journal of Control Theory and Applications 04/2006; 4(2):175-180.
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ABSTRACT: A novel genetic clustering-based transiently chaotic neural network (GCTCNN) algorithm for Capacity Vehicle Routing Problem (CVRP) is proposed. CVRP can be partitioned into two kinds of decisions: the selection of vehicles among the available vehicles and the routing of the selected fleet. Using the clustering algorithm the customers are grouped into clusters and each cluster is served by one vehicle. Then transiently chaotic neural network solves the routes to optimality. Computation on benchmark problems and comparison with other known algorithm show that the proposed algorithm produces excellent solutions in short computing times.
Neural Networks and Brain, 2005. ICNN&B '05. International Conference on; 11/2005
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ABSTRACT: Subject to limited computational resource, feedback scheduling aims to improve, or to optimize, the global control performance of real-time control systems. For the system that consists of simple control tasks, a feedback scheduling scheme is presented to shorten tasks' deadlines online as much as possible, so as to reduce jitter and to improve the performance. For the system that consists of complex control tasks, another feedback scheduling scheme is presented to adjust the reserved processor time for each task dynamically, and thus to optimize the performance, if these tasks can be implemented as anytime algorithm. The general feedback scheduling architecture is introduced. The control strategy in both schemes is model predictive control. The designs of feedback controllers are discussed. And the stability conditions are also analyzed.
Computer and Information Technology, 2005. CIT 2005. The Fifth International Conference on; 10/2005
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Advances in Neural Networks - ISNN 2005, Second International Symposium on Neural Networks, Chongqing, China, May 30 - June 1, 2005, Proceedings, Part I; 01/2005
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ABSTRACT: In this paper, the robust H<sub>∞</sub> filtering problem for linear systems with parameter uncertainty is reconsidered. First, based on bounded real lemma, a robust H<sub>∞</sub> filter is designed such that the induced L<sub>2</sub> norm of the transfer function from the noise signals to the estimation error is guaranteed to be within a prescribed bound for all the admissible uncertainties. Then, a constructive proof for the existence of a robust H<sub>∞</sub> filter is developed. Along the line of this paper, many new results on robust control and filtering can be derived easily.
Machine Learning and Cybernetics, 2004. Proceedings of 2004 International Conference on; 09/2004
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ABSTRACT: A novel image registration scheme is proposed. Low order Zernike moments are used as image global pattern features and feed into feedforward neural networks to provide translation, rotation and scaling parameters. Experimental results show that the proposed registration scheme is accurate and robust to noise.
Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on; 07/2004
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ABSTRACT: Due to communication network introduced into control systems, it arouses many problems. The most important one is network-induced delays. These delays deteriorate the performance of the systems. Worse, they may be a potential source of instability for the systems. In order to compensate for these delays, an improved online delay evaluation method is presented. By this method we can get the exact delays in the control loops, which is based on the compensation information of the controller. Depending on these delay values, we can modify the parameters of the controller, so as to ensure the desired performance of control systems. Experiment results show that this method is valid.
Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on; 07/2004
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ABSTRACT: In this paper, we propose an image adaptive watermarking scheme in DWT domain, by utilizing fuzzy clustering theory, the watermark can be adaptively embedded without degradation of the original image. In order to improve the robustness, we embedded watermark several times, and watermark can be extracted without referring to the original image. Simulations of various attacks will be given to demonstrate the robustness of the proposed algorithm.
Neural Networks and Signal Processing, 2003. Proceedings of the 2003 International Conference on; 01/2004
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ABSTRACT: In this paper, we propose a novel digital watermarking scheme in DCT domain based on fuzzy clustering technique and human visual system to adapt the embedding strength of different blocks according to block classification. We choose a binary image as watermark and embed it into the larger coefficients in mid-band frequency of the selected blocks. This method allows to embedding more robust watermark under a certain visual distance. Experimental results show that the proposed scheme can survive common image signal process.
Neural Networks and Signal Processing, 2003. Proceedings of the 2003 International Conference on; 01/2004
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ABSTRACT: In this paper, we propose a joint power and rate allocation scheme for the downlink wireless data services in CDMA networks. Our goal is to maximize total utility of the system while maximizing the utility of each mobile user. The utility of a mobile user is an increasing function of its effective throughput. We propose a distributed allocation algorithm based on dynamic pricing. The algorithm is composed of three processes, user selection, power allocation and rate allocation. Moreover, the optimization model and algorithm considering minimum rate constraints of users are established to provide quality of service for mobile users. Numerical simulations are conducted to demonstrate the performance of the algorithm. We compare our algorithm with centered social optimal allocation algorithm and fixed rate allocation schemes, and investigate the effects of the minimum rate constraints and maximum power of the base station on the utility of the system. Results show that the performance of our algorithm is close to the social optimal allocation scheme, and better than the power control scheme with fixed rate allocation.
Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings on; 10/2003
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ABSTRACT: Power control is one of the major challenges in radio resource management in wireless CDMA networks. Traditional power control scheme mainly concerns real-time voice services in mobile communications systems. In this paper, we present a new utility function with pricing and propose an economic model using game theory for uplink power control for data services in wireless CDMA networks. Based on the model we propose a synchronous distributed power control algorithm. Numerical simulations are conducted to demonstrate the performance of the algorithm. We investigate the pricing factor on the performance of the system. The results show the performance of convergence of the algorithm is satisfactory.
Communication Technology Proceedings, 2003. ICCT 2003. International Conference on; 05/2003
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ABSTRACT: An alternative blind adaptive algorithm is proposed for CDMA antenna arrays. It requires neither decision feedback nor post-correlation matrix estimation. Simulations show that it outperforms the despread-respread approach with similar complexity and approaches the performance of the code filtering approach with less complexity.
Electronics Letters 02/2003; · 0.96 Impact Factor
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ABSTRACT: A DC motor PWM speed controller based on 16-bit super capability single-chip microcomputer 80C196KC is presented. The practical application shows that the system has a simple structure and reliable speed regulation capability. The control algorithm of this system is easy to change, without changing the hardware. It also shows that the capability to price of this system is very high.
Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on; 02/2002
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ABSTRACT: Adaptive modulation can improve both the energy and spectral efficiency. In this paper, the performance analysis of BER and BPS based on adaptive modulation between BPSK, QPSK, 16QAM and 64QAM are given. Simulation shows that the result of adaptive modulation are better than that of fixed modulation.
Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on; 02/2002
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ABSTRACT: This paper presents a DC position servo system which has three closed loops: a current loop, speed loop and position loop. Both an analog PID controller and the improved PID control algorithm are used. Base on the controller designing approach in engineering, each of the controller structure is obtained. The practical method of tuning these controllers is discussed in detail. In the digital position loop, a flexible implementation of the improved PID control algorithm brings the desired location accuracy and limits the overshoot to an acceptable value. The PID normalized parameter tuning method, which significantly reduces the online tuning time, is also included.
Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on; 02/2002
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ABSTRACT: Surveys the research in transmitting power control (TPC) in CDMA cellular systems with an emphasis on the aspects of power controller design. First of all, some basic theories of power control are reviewed from the point of view of communication. Then the TPC problem is put in the standard framework of a control process, and quantities in TPC are treated as control system components. Most of the available control strategies are then reviewed, and the focus is put on the step size design of the power controller. Finally future research directions for TPC are suggested.
Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on; 02/2002
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ABSTRACT: First, in this paper we present the integral structure of RS-485 fieldbus network in practical industrial applications. Through designing and implementing RS-485 fieldbus control systems, we gained much experience in configuration of resistor termination network, noise elimination on floating transmission lines, transmission control, multi communication station addressing and flow control. Then we discuss those points in detail. Finally, we consider the problems of network reliability and multi station real time data acquisition and control.
Intelligent Control and Automation, 2002. Proceedings of the 4th World Congress on; 02/2002
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ABSTRACT: Proposes a technique for deriving extra insensitivity time delay filter using zero-placement in the discrete domain. Unlike previous derivations, this method leads to construction of a discrete transfer function to meet requirements on filter performance. This derivation is verified with the anti-sway control of cranes
Intelligent Control and Automation, 2000. Proceedings of the 3rd World Congress on; 02/2000
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ABSTRACT: Based on the T-S fuzzy model, a design method for a fuzzy feedback
linearization system is investigated. For systems with uncertainties, a
sufficient condition to make closed system L<sub>2</sub>-stabilization
is proposed using the small gain theorem, and the bound of uncertainties
is given. The simulation shows the fuzzy feedback linearization is a
valid method to control nonlinear systems
Intelligent Control and Automation, 2000. Proceedings of the 3rd World Congress on; 02/2000
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ABSTRACT: A new proportional and derivative (PD) type time delay filter, which utilizes the time-delay effect, is first applied to a non-minimum phase system. It can stabilize an unstable system using delayed feedback, and also quickly response to input changes. Furthermore, it is shown that a conventional P-controller equipped with an appropriate time-delay unit performs an average derivative action, and is therefore insensitive to high-frequency noise. The simulation results demonstrate the effectiveness of this PD type time delay filter
Control Applications, 2000. Proceedings of the 2000 IEEE International Conference on; 02/2000
