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In practice, there exist such controlled systems in which some states are often not available, not measurable or too expensive to measure. For such systems, impulsive control inputs may be exerted on the available partial states so as to stabilize the underlying systems. This paper is concerned with analyzing the stability of a class of nonlinear time-delay systems with partial states subject to impulsive...
The task of failure prognosis requires the prediction of impending failures. This is possible if each failure trace possesses a nonfailure prefix for which at least one local prognoser is unambiguous that a failure in future is inevitable. This paper formulates and studies the problem of distributed prognosis of discrete event systems, where the local prognosers exchange their observations of the...
This paper aims to design a controller to robustly stabilize uncertain nonlinear systems with time-varying delay and norm bounded uncertainties via Takagi-Sugeno (T-S) fuzzy model. The stabilization conditions are given in the form of linear matrix inequalities using a single Lyapunov-Krasovskii functional (LKF) combining the introduction of some relaxation matrices and only one tuning parameter....
We present an approach for compensating input delay of arbitrary length in nonlinear control systems. This approach, which due to the infinite dimensionality of the actuator dynamics and due to the nonlinear character of the plant results in a nonlinear feedback operator, is essentially a nonlinear version of the Smith Predictor and its various predictor-based modifications for linear plants. Global...
In recent work the authors combined integral-quadratic-constraint (IQC) based analysis with ??-gap metric based analysis to study the robustness of feedback interconnections of possibly unstable rational transfer functions. This is extended here to the case of irrational transfer functions without pure delays. Specifically, we restrict attention to the sub-algebra of Callier-Desoer class transfer...
In this paper, iterative learning control (ILC) is applied to network-based control problems in which communication channels are subject to random transport delay and data dropout. An averaging ILC algorithm is used to overcome the random factors. Through analysis, it is shown that ILC can perform well and achieve asymptotical convergence in ensemble average along the iteration axis, as far as the...
This paper considers interval time-varying delay systems with delayed estimation of the delay. This case is often encountered in the Networked Control Systems (NCS) field. Based on Lyapunov-Krasovskii functional methods and linear matrix inequality (LMI) techniques, a switching state feedback controller is designed to guarantee the exponential stability. The controller switches according to the measured...
This paper presents adaptive neural tracking control for a class of non-affine pure-feedback systems with multiple unknown state time-varying delays. The separation technique is introduced to decompose unknown functions of all time-varying delayed states into a series of continuous functions of each delayed state. A novel Lyapunov-Krasovskii functional is employed to compensate for the unknown function...
Particle swarm optimization (PSO) algorithm is a population-based algorithm for finding the optimal solution. Because of its simplicity and high efficiency, PSO is gaining attention in solving complex and large scale problems. However, PSO often requires long execution time to solve those problems. This paper proposes a parallel PSO algorithm, called delayed exchange parallelization, which improves...
Performance of wireless sensor networks (WSNs) can be affected when the network is deployed under different topologies. In this paper we present a performance study of congestion control algorithms in WSNs when nodes are deployed under different topologies. To perform our research we have employed algorithms SenTCP, directed diffusion, and HTAP. The choice of these algorithms is based on the fact...
In sensor networks communication by broadcast method involves many hazards, especially collision. Several MAC layer protocols have been proposed to resolve the problem of collision namely ARBP, where the best achieved success rate is 90%. We hereby propose a MAC protocol which achieves a greater success rate (Success rate is defined as the percentage of delivered packets at the source reaching the...
A programmable DCO-based fast-locking clock generator is presented. With a resettable DCO, the clock generator achieves similar jitter performance as conventional MDLL and avoids the initial delay constraints by resetting the output clock every two reference cycles. Compared with the previous work, a shorter locking time is obtained. The proposed clock generator is simulated with generic 1.8 V-0.18...
This paper presents FPGA implementations of add/subtract algorithms for 10's complement BCD numbers. Carry-chain type circuits have been designed on 6-input LUT's Xilinx Virtex-5 FPGA technologies. Some new concepts are reviewed to compute the P and G functions for carry-chain optimization purposes. Designs are presented with the corresponding time performances and area consumption figures. Results...
Time-delay is a widespread phenomenon of control system. Time-delay characteristics have a serious impact on system stability and performance. It is valuable to study iterative learning control of time-delay system. In this paper, we study the effects of multiple time delay on the convergence of nonlinear time-delay systems applying ??-norm and a set of inequalities. It will be shown that time-delay...
This paper considered the non-fragile control problem of networked control systems with both fast-varying network-induces delay and data dropout. Using Lyapunov stability theory and the linear matrix inequality (LMI) approach, new criteria are proposed for the non-fragile controller design. The new criteria are irrelevant to the bound of the derivative of the delay, no constrain is imposed to the...
Component adaptation is widely considered to be one of the crucial problems in Component-Based Software Engineering. Based on the analysis of multiple component adaptation methods, we propose a new approach to component adaptation dealing with extra-functional mismatches, which is illustrated associating with a simplified example of Image Viewer/Browser. The results show that this new approach can...
This paper is concerned with the stabilization of networked control systems with nonlinear perturbations and fast-varying network-induces time-delay, and data dropout is also taken into consideration. Using LMI approach, new criteria are proposed for the controller design. The new criteria are irrelevant to the bound of the derivative of the delay, no constrain is imposed to the matrix structure....
TCP now is widely used in Transmission Control Protocol; however, in the wireless network environment, TCP congestion control typically has some defects such as high-error rate, long-latency, low-bandwidth and frequent-movement, etc. In the wireless network, the implementation difficulty of congestion control mechanism is the degree of congestion, which is not only relevant to the length of the queue,...
It is very necessary and meaningful to carry out research aiming at traffic signal control sub-area method. However, the accuracy and robustness of traffic signal control sub-area still can not meet the need of practice. First, this paper researches the popular methods and their key techniques. Second, the paper considered following four influencing factors: distance between intersections, major road...
Given a graph and an integer L ?? 0, the beacon placement problem (BPP) asks to find a minimum set B of nodes such that for all edges e, at least one of the two endpoints of e can be reached from some node (called an L-beacon) in B using at most L edges. In particular, it reduces to the vertex cover problem if L = 0. This problem arises from link-monitoring in computer networks. Generalizing the works...
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