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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...
Though P2P grid has attracted great attention these days, trust management is still a complex and difficult task. This paper proposes a dynamic reputation management framework to enhance trust in the unstructured P2P Grid. The proposed model extends the normal trust model and takes the impact of the mobility of peers into account. Based on this framework, we show how to calculate, store, collect and...
In order to identify traffic state of road section and provide decision support for traffic management, a method was proposed for road section traffic state identification based on vague sets. The traffic state decision matrix was constructed, and then the identification steps for road section traffic state were given in detail. Then the knowledge acquisition method of regional road network traffic...
This paper investigates the stabilization problem for continuous-time stochastic latency networked control systems (NCS) with non-accessible jumping modes. Based on mode-dependent Lyapunov functional and descriptor system approach, a new method for mode-independent control of such systems is developed in terms of the solvability of linear matrix inequalities (LMIs). Illustrative example demonstrates...
To achieve flexible support for multi-channels supplied by remote monitor system and to implement hybrid transmission mode, this paper designs and introduces a mechanism of data transmitting buffer queue, which is with multiple priorities processing. The mechanism is composed of data input queue facing to upper layer and data output queue facing to diverse communication channels and it contains retransmission...
Recently, some push-pull scheduling strategies have been proposed to replace the classical pull mechanism in mesh based P2P streaming systems. A push-pull mechanism is more efficient in terms of the overheads and leads to much better playback delay performance since the pull part is mainly used either at the beginning of the session or to recover lost content. Since a push-pull mechanism typically...
A queuing system with dual services, i.e., the primary service and the auxiliary service, is considered in the present article. The server has to allocate part of its capacity to process the additional service when the auxiliary service is requested. We show that the possible optimal auxiliary capacity is actually on the convex envelope of the auxiliary cost function. Also, the optimal control policy...
Mining temporal network models from discrete event streams is an important problem with applications in computational neuroscience, physical plant diagnostics, and human-computer interaction modeling. We focus in this paper on temporal models representable as excitatory networks where all connections are stimulative, rather than inhibitory. Through this emphasis on excitatory networks, we show how...
The dynamics of hybrid systems with mode dynamics of different dimensions is described. The first part explores structural properties of such multi-mode multidimensional (M3D) systems. The second part considers such models under sequential switching at random times. More specifically, the backward Kolmogorov equation is derived. This is applied to a causally restricted hybrid system containing a mode...
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