Now showing items 135-154 of 229

  • [2012-04-07] Observer-based controller synthesis for model-based fuzzy systems via linear matrix inequalities 

    Abdallah, Chaouki T.; Jadbabaie, Ali; Titli, Andre; Jamshidi, Mohammed
    In this chapter, we extend some recent results regarding the stability of continuous-time and discrete-time Takagi-Sugeno (T-S) fuzzy systems to the case where the system’s states are not available for measurement. We ...
  • [2012-03-29] On Load balancing in distributed systems with large time delays: Theory and experiment 

    Abdallah, Chaouki T.; Ghanem, J.; Dhakal, S.; Hayat, M. M.; Jerez, H.
    In a distributed computing environment with a high communication cost, limiting the number of balancing instants results in a better performance than the case where load balancing is executed continuously. Therefore, finding ...
  • [2012-04-24] On Robustness Analysis in the Control of Nonlinear Systems 

    Abdallah, Chaouki T.; Lewis, F. L.
    This paper deals with the class of nonlinear systems described by the equation M(q(t))q(t) = f(t) - N(q(t),q¿(t)) with f(t) a control input. We employ a simple method of control design which has two stages. First, a global ...
  • [2012-04-13] On The Computational Complexity Of The Manufacturing Job Shop And Reentrant Flow Line 

    Abdallah, Chaouki T.; Lewis, F.L.; Horne, B.G.
    This paper presents a comparison study of the computational complexity of the general job shop protocol and the flow line protocol in a flexible manufacturing system. It is shown that a certain representative problem of ...
  • [2012-04-12] On the control of a high power backward-wave oscillator using quantifier elimination methods 

    Abdallah, Chaouki T.; Yang, W.; Schamiloglu, E.; Souvalian, V.
    This paper presents an experimental/theoretical study of methods to identify and control a repetitively-pulsed high power microwave source. A neural network was used to model the system and quantifier elimination (QE) ...
  • [2012-04-12] On the design of non-fragile compensators via symbolic quantifier elimination 

    Abdallah, Chaouki T.; Dorato, Peter; Famularo, D.
    In this paper symbolic quantifier elimination methods are used to explore the fragility of feedback compensators, and to design feedback systems with non-fragile compensators. A compensator is said to be fragile if given ...
  • [2012-04-26] ON THE FRAGILITY OF HIGH-DIMENSIONAL CONTROLLERS 

    Abdallah, Chaouki T.; Perez-Gonzalez, F.
    In this paper we study the fragility of controllers designed to optimize some performance indices. We trace the fragility problem to the dimension of the resulting controllers, and use results from high-dimensional geometry ...
  • [2012-04-26] On the Relative Degree of Simultaneously Stabilizing Controllers 

    Abdallah, Chaouki T.; Bredemann, M.; Dorato, Peter
    In this brief paper 1 we present new necessary and sufficient conditions on the controller for the existence of a single controller to stabilize a set of n SISO plants: P1; P2; :::; Pn. As is well known this is equivalent ...
  • [2012-04-19] On the Robust Control of Uncertain Nonlinear Systems 

    Abdallah, Chaouki T.; Eras, A.
    In this paper we study the problem of controlling uncertain nonlinear systems. The uncertainty is considered to be dynamic and additive, and the nominal system is assumed to be feedback-linearizable. It is shown that the ...
  • [2012-04-07] On the rotating surge and stall and the polar control method 

    Abdallah, Chaouki T.; Horspool, K. R.
    In this paper, the polar controller is applied to the three-state, one-mode Moore-Greitzer Compressor model. A benchmark is first established with a backstepping controller. The polar control method is then explained, and ...
  • [2012-04-12] On the stability of LAPART 

    Abdallah, Chaouki T.; Heileman, G.L.; Healy, M.J.
    In this paper we show how the stability of a LAPART neural network can be deduced as a result of a general theorem on the input/output stability of nonlinear systems. This result gives conditions on how to choose certain ...
  • [2012-04-07] Optimal discrete-time control for non-linear cascade systems 

    Abdallah, Chaouki T.; Haddad, W. M.; Fausz, J. L.; Chellaboina, V.
    In this paper we develop an optimality-based framework for designing controllers for discrete-time nonlinear cascade systems. Specifically, using a nonlinear-nonquadratic optimal control framework we develop a family of ...
  • [2012-03-20] Optimization and complexity reduction of switch-reconfigured antennas using graph models 

    Abdallah, Chaouki T.; Costantine, Joseph; Christodoulou, Christos G.; Barbin, Silvio E.
    This letter addresses the optimization and complexity reduction of switch-reconfigured antennas. A new optimization technique based on graph models is investigated. This technique is used to minimize the redundancy in a ...
  • [2012-04-06] Overview of intense beam-driven relativistic backward wave oscillators and their use in high power microwave effects studies 

    Abdallah, Chaouki T.; Pizano, C.E.; Heileman, G.L.; Pattichis, M.S.
    We propose mathematical performance measures by which the robustness, imperceptibility and information content of various watermarking methods could be measured. These measures rely in the notion of equivalence in the ...
  • [2012-04-26] An Overview of Quasi-Monte Carlo Methods in Control Systems 

    Abdallah, Chaouki T.; Hokayem, P.F.; Dorato, P.; Mastellone, S.
    Many control problems are so complex that analytic techniques fail to solve them [2]. Furthermore, even when analytic solutions are available, they may be computationally costly [2] and generally result in very high-order ...
  • [2012-04-07] Performance measures for image watermarking schemes 

    Abdallah, Chaouki T.; Heileman, Gregory L.; Pizano, Carlos E.
    In this paper we propose performance measures and provide a description of the application of digital watermarking for use in copyright protection of digital images. The watermarking process we consider involves embedding ...
  • [2012-03-30] Performance of Game Theoretic Power Control Algorithms for Wireless Data in Fading Channels 

    Abdallah, Chaouki T.; Hayajneh, M.
    An efficient use of the radio resources in wireless communications presents a fundamental challenge. While power is one of the most important radio resources, and its control has been studied extensively for voice ...
  • [2012-04-26] Performance of Game Theoretic Power Control Algorithms forWireless Data in Fast Flat Fading Channels 

    Abdallah, Chaouki T.; Hayajneh, M.
    We consider a game-theoretic power control algorithm for wireless data realistic channels. We study the performance of the algorithm for wireless data in the fast, flat-fading channel mobile users encounter in accessing ...
  • [2012-04-13] Phase-convex arcs in root space and their application to robust SPR problem 

    Abdallah, Chaouki T.; Perez, F.
    This paper considers the problem of identifying regions in the complex-plane, such that the phase of polynomials having roots in those regions, is bounded by that of a few extreme polynomials. Applications of the results ...
  • [2012-04-12] Polynomial solutions for simultaneous stabilization 

    Abdallah, Chaouki T.; Bredemann, Mike; Dorato, Peter
    In this paper, we present a new necessary and sufficient condition for simultaneous stabilization and new sufficient conditions for the existence of a simultaneously stabilizing controller, both derived from a polynomial ...