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The notions of the (strongly) practical stability in probability and in the pth mean, are introduced for some large-scale stochastic systems with Markovian jump parameters and time-varying delays. Sufficient conditions on such practical properties are obtained by using the comparison principle and the Lyapunov function methods.
In this paper, we focus on fair access to bandwidth in daisy-chained interconnects. We first analyze the original HyperTransport fairness protocol and show that it is not perfectly fair. We then propose a new, fair scheme whose complexity is similar to that of the HyperTransport protocol.
This paper is concerned with the networked guaranteed cost control of uncertain systems with both time-varying network-induces delay and data dropout. Using LMI approach, new criteria are proposed for the networked guaranteed cost controller design. The new criteria are irrelevant to the bound of the derivative of the delay, no constrain is imposed to the matrix structure. A numerical example is given...
In this paper a closed form expression for the phase-to-frequency-detector (PFD) output error, in Fractional Frequency Synthesizers, is obtained. It is demonstrated that the limit frequency of operation for the PFD not only depends on the reset delay signal but also in the setup time of the PFD. With this equations a suitable delay in the reset signal can be selected.
The message-based communication among services in Service Oriented Architecture (SOA) is vulnerable to various security attacks, and has to be well protected by security mechanisms, which may sacrifice service performance due to limited system resources. In this paper, an adaptive tradeoff model for service performance and security in service- based systems is presented. This model can be used to...
In this paper, non deterministic Indirect Reinforcement Learning (RL) techniques for controlling the transmission times and power of Wireless Network nodes are presented. Indirect RL facilitates planning and learning which ultimately leads to convergence on optimal actions with reduced episodes or time steps compared to direct RL. Three Dyna architecture based algorithms for non deterministic environments...
We consider the global and preemptive scheduling problem of multi-mode real-time systems upon identical multiprocessor platforms. Since it is a multi-mode system, the system can change from one mode to another such that the current task set is replaced with a new task set. Ensuring that deadlines are met requires not only that a schedulability test is performed on tasks in each mode but also that...
A significant problem with no simple solutions in current real-time literature is analyzing the end-to-end schedulability of tasks in distributed systems with cycles in the task graph. Prior approaches including network calculus and holistic schedulability analysis work best for acyclic task flows. They involve iterative solutions or offer no solutions at all when flows are non-acyclic. This paper...
The Smith predictor is a well-known method for designing controllers for plants with I/O delays. Assuming the time delay known, this control configuration compensates the delay within the loop making it possible to design the controller just considering the (rational) delay-free part of the plant. Since the original Smith predictor does not allow to deal with unstable plants, intensive research has...
This paper studies a topical capacitated network design problem that arises in the telecommunication industry. In this problem, given point-to-point demand between various pairs of nodes, a minimum cost survivable network must be designed by installing capacitated equipments (routers, line cards, ...) on nodes as well as link facilities on arcs. This realistic problem finds its motivation in the rapidly...
Automotive electronics architectures need to be evaluated and selected based on the estimated performance of the functions deployed on them before the details of these functions are known. End-to-end delays of controls must be estimated using incomplete and aggregate information on the computation and communication load for ECUs and buses. We describe the use of statistical analysis to compute the...
In this paper the generalized numerical Rogers-Ramanujan continued fraction expansion is extended to two-dimensions (2-D). A new fast algorithm is proposed for the inversion of the 2-D Rogers-Ramanujan continued fraction expansion. The algorithm is based on matrix formulations. The simplicity and efficiency of the algorithm are illustrated by step-by-step examples.
This paper investigates the problem of simultaneous fault and state estimation of either bounded state or globally Lipschtiz nonlinear systems subject to time delay and unknown input. We assume that the system has a triangular structure and the fault is a scalar and polynomial time dependent function. Based on the Lyapunov analysis method, we show that the observer design is related to neither delay...
In this paper, an integrated methodology is developed for optimizing inspection and maintenance of a component where delayed repair is considered to be one of feasible options. The models of failures, risk and life cycle cost are developed using probability, stochastic process and the delay time concept. The model is intended to optimise the inspection intervals and the delay of repair simultaneously...
In this paper, we analyze the effect of different degrees of node cooperation on the performance of routing protocols for delay tolerant networks. We first present an accurate analytical characterization of the performance of epidemic and two-hops routing in terms of expected packet delivery rate under the standard assumption of fully cooperative node behavior. This characterization is itself an interesting...
This paper is concerned with the reliable Hinfin filtering problem against sensor failures for a class of continuous time systems with simultaneous sector-bounded nonlinearities and varying time delay. The resulting design is such that the filtering error system is asymptotically stable and meets the prescribed Hinfin norm constraint in the nominal case as well as in the sensor failure case. A sufficient...
The objective of this paper is to extend and refine the nonlinear canonical variate analysis (NLCVA) methods developed in the previous work for system identification and monitoring of automotive engines. The use of additional refinements in the nonlinear modeling are developed including the use of more general bases of nonlinear functions. One such refinement in the NLCVA system identification is...
In the companion paper we introduced a vehicle routing problem in which service demands arrive stochastically on a line segment. Upon arrival, the demands translate perpendicular to the line with a fixed speed. A vehicle, with speed greater than that of the demands, seeks to provide service by reaching each mobile demand. In this paper we study a first-come-first-served (FCFS) policy in which the...
In this paper, we present a delay-dependent robust model predictive control (MPC) algorithm for a class of discrete-time linear state-delayed systems subjected to polytopic-type uncertainties and input constraints. The state-feedback MPC law is calculated by minimizing an upper bound of the worst-case quadratic cost function over an infinite time horizon at each sampling instant. In contrast to existing...
In networked control systems (NCS), the spiky nature of the random delays makes us wonder about the benefits we can expect if the ldquospikinessrdquo, or what we call ldquodelay dynamicsrdquo are considered in the NCS controller design. It turns out that the ldquospikinessrdquo of the network induced random delays can be better characterized by the so-called alpha-stable processes, or processes with...
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