Sana Testouri

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In this paper, stabilizing regions of a first-order controller for an all poles system with time delay are computed via parametric methods. First, the admissible ranges of one of the controller's parameters are obtained. Then, for a fixed value of this parameter, stabilizing regions in the remaining two parameters are determined using the D-decomposition(More)
In this paper, the AQM controller of a first-order controller’s type is proposed. The model of TCP/AQM is described by a second-order system with time delay. An analytical approach to analyze the stability of TCP/AQM Networks is used, based on the D-decomposition method and lemma Kharitonov for quasipolynomial. The proposed method for design first-order(More)
In this paper, we investigate the overload problem of a congested router in TCP networks, with a design of an AQM (Active Queue Management) controller based on control theory. The model of TCP/AQM is converted into a second-order system with time delay, the stability of the closed-loop AQM system is described in terms of a characteristic quasi-polynomial.(More)
This paper proposes a Particle Swarm Optimization (PSO) method for determining the optimal parameters of a first-order controller for TCP/AQM system. The model TCP/AQM is described by a second-order system with time delay. First, the analytical approach, based on the D-decomposition method and Lemma of Kharitonov, is used to determine the stabilizing(More)
This paper presents a Particle Swarm Optimization (PSO) method for determining the optimal parameters of a first-order controller for TCP/AQM system. The model TCP/AQM is described by a second-order system with time delay. First, the analytical approach, based on the D-decomposition method and Lemma of Kharitonov, is used to determine the stabilizing(More)
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