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Systems with tightly interacting computational (cyber) units and physical systems are generally referred to as cyber-physical systems. They involve an interplay between embedded systems, control theory, real-time systems and software engineering. A very good example of cyber-physical systems design arises in the context of automotive architectures and software. Modern high-end cars have 50–100 processors...
Multi-axle transportation vehicles usually adopt distributed electro-hydraulic proportional systems based on network to perform the complicated manipulation and control functions. Aiming to the adverse effects caused by network induced time delay, a networked sliding mode control strategy for leveling subsystem of multi-axle transportation vehicles is presented. The model of distributed leveling subsystem...
In this paper, the scheduling problem of the network with limited bandwidth is considered. In order to improve the network quality of service and the quality of control simultaneously, an intelligent feedback scheduling method is proposed. The scheduler reschedules the priority, the sampling period, and the output threshold concurrently according to the control authority of each node, which is calculated...
Intelligent Traffic Management (ITM) system promises to reduce the traffic congestion, intelligent intersection management as well as the smart dissemination of the informatics to control the traffic flow. Development of any Intelligent Transportation System (ITS) applications requires realistic road traffic model to analysis the performance. Service rate or service time is one of the most important...
With the intention of establishing the connectivity between the femtocell and the core network, it is essential to use public network that ultimately creates several challenges for the operators. Therefore, Synchronization is considered corner stone and has become one of the most significant issues in femtocellular networks to ensure a tolerable carrier offset as well as support received signals in...
For networked control systems (NCS), the network-induced time delay with uncertain nature may degrade the control performance and even destabilize the system. Therefore, it is necessary to study the strategies to compensate time delay. In order to effectively restrain the impact of network time delay, a single neuron PID controller combined with adaptive Smith predictor is proposed to achieve better...
This paper develops a simple analytical model based on a Markov chain that calculates saturation throughput and average packet delay for the IEEE802.11 Distributed Coordination Function (DCF) for network scenarios with voice and data stations. The analytical model is validated by comparing its results with simulation outcome. Based on the analytical model, a methodology that calculates voice capacity...
This paper illustrates a semi-active handover algorithm on the integrated utilization of RSS and location, according to characteristics of a cellular network and WiFi. While connecting to a cellular network, MS (Mobile Station) is in the passive mode, where BS (Base Station) informs the MS to hand over on the basis of location information. In contrast, MS in the WiFi link chooses the optimal AP (Access...
By using Gaines and Mawhin's continuation theorem of coincidence degree theory, we studied the global existence of positive periodic solutions of a predator-prey diffusive model with ratio-dependence and feedback control. We obtain a set of verifiable sufficient conditions to guarantee the existence of positive periodic solutions of the system, which improve some known results.
In this paper, we study the existence of positive periodic solutions for a predator-prey diffusive system with delayed density restricts and stage structure. One bounded open sets are obtained by using analytic technique and a set of sufficient conditions for this system to have at least one positive periodic solution is obtained. The phenomenon is revealed that when the carrying capacity of prey...
By using a continuation theorem based on coincidence degree, we study the global existence of positive periodic solution of the periodic Lotka-Volteraa food chain model with delays. A set of easily verifiable sufficient conditions are obtained, some new results obtained.
A three-stage-structured prey-predator system with predator density dependent time delay is considered. The positive and uniformly bounded of the solution of the system are obtained, and the conditions for the system occurring global Hopf bifurcation is given. Finally, numerical simulations and brief conclusion are given.
In this paper, we investigate the permanence of a class of Holling III-Tanner predator-prey diffusion system with stocking rate and time delay, the existence positive periodic solution by using Comparability Theorem, Coincidence Degree Theory. We obtain the sufficient conditions which guarantee permanent of the system and existence of the positive periodic solution of the periodic system. Some new...
This paper studies a nonautonomous predator-prey system with two compete prey predated by one predator and infinite delay. By using differential equation Comparability Theorem and Continuation theorem based on Coincidence degree theory, we obtain the permanent and positive periodic solution existence of the system. Some new results obtained.
In this paper, a non-autonomous predator-prey diffusion system of two species with depositings and ratio-dependence is investigated. By using Comparability Theorem and Mawhin's continuation theorem of coincidence degree theory, a set of easily verifiable sufficient conditions are obtained to guarantee the permanent and existence of positive periodic solutions of the system. Some new results obtained.
As SoC applications demand high performance and integration density, SoC designers consider multiple aspects during the design phase. This paper presents a Network-on-Chip (NoC) design methodology for generating high quality interconnects for multi-core System-on-Chip architectures. The design process incorporates the main objectives of low power and high performance during topology synthesis. A rendezvous...
In this paper, we investigate the persistence of a class environment mathematical model with delays, the existence and the global stability of its global positive periodic solution by using Comparability Theorem, Coincidence Degree Theory and Lyapunov functions. We obtain the sufficient conditions which guarantee the existence of the global asymptotic stable positive periodic solution of the periodic...
In the article we propose a method of improving ITU-T E-model MOS estimate of VoIP call quality. The improvement consists of including the effects of network jitter as measured and distributed in RTCP packets; jitter buffer size at receiver and codec packetization settings as input parameters of E-Model. Our method uses Pareto/D/1/k system for modeling general VoIP input traffic stream interarrival...
Performance analysis of network queuing model is very important due to delay and latency that may be caused by using inappropriate model. It also impacts the utilization and throughput of the network. Many network queuing models have been proposed to be used in the network such as Poisson distribution model and Exponential distribution model. The first step in using a suitable queuing model is to...
Shared resource access interference, particularly memory and system bus, is a big challenge in designing predictable real-time systems because its worst case behavior can significantly differ. In this paper, we propose a software based memory throttling mechanism to explicitly control the memory interference. We developed analytic solutions to compute proper throttling parameters that satisfy schedulability...
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