Now showing items 150-169 of 229

  • [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 ...
  • [2012-04-19] A positive-real design for robotic manipulators 

    Abdallah, Chaouki T.; Jordan, R.
    In this paper, we show that feedback-linearization in conjunction with the passivity property of rigid robots can guarantee the robustness of the closed-loop robotic system despite large uncertainties in the inertia matrix. ...
  • [2012-03-30] Power control algorithms in wireless communications 

    Abdallah, Chaouki T.
    This paper presents a comprehensive review of the published algorithms on power control for cellular systems. The majority of the research is focused on Code Division Multiple Access (CDMA) systems, although a small fraction ...
  • [2012-04-16] Power systems stabilization with feedback linearization 

    Abdallah, Chaouki T.; Kristjansson, Erlendur; Jamshidi, M.
    Input-state feedback linearization is discussed in this paper as a method for power system control. This method linearizes for a range of operating points and is more appropriate than the conventional methods since the ...
  • [2012-03-27] Practical issues in networked control systems 

    Abdallah, Chaouki T.; Lopez, Ivan; Piovesan, J. L.; Lee, D.; Martinez, O.; Spong, M.; Sandoval, R.
    In this paper we expose experimental issues faced in a closed-loop networked control system. We also propose some compensation actions, and evaluate their performance for different experimental setups, focusing specifically ...
  • [2012-03-23] Preliminary Results on Interconnected Hybrid Systems 

    Abdallah, Chaouki T.; Piovesan, Jorge; Tanner, Herbert
    We present a new framework for describing multi-agent systems with hybrid individual dynamics where the interaction between agents occurs at both the continuous and discrete levels. We formally define these multi-agent ...
  • [2012-03-29] Quasi-Monte Carlo methods in robust control design 

    Abdallah, Chaouki T.; Hokayem, Peter E.
    Many practical control problems are so complex that traditional analysis and design methods fail to solve. Consequently, sampling methods that provide approximate solutions to such difficult problems have emerged. In this ...
  • [2012-01-31] Quo Vadis? Public Colleges and Their Funding 

    Salazar, Andres C.
    This paper reviews the current debate about the motivation, adequacy and distribution of funding for public colleges. Although the debate has been ongoing for some time, it has become especially heated in recent years due ...
  • [2012-03-24] Randomized Algorithms for Analysis and Control of Uncertain Systems-[Book review; R. Tempo, G. Calafiore, and F. Dabbene] 

    Abdallah, Chaouki T.; Dorato, Peter
    This is the first book that fully covers both randomized algorithms and robust control design. Some of the major topics covered include: a review of probability theory; the robust control problem; computational complexity; ...
  • [2012-04-07] A Randomized approach to the H2/H∞ Control Problem via Q-parameterization 

    Abdallah, Chaouki T.; Horspool, Kenneth R.; Erwin, R. Scott; Dorato, Peter
    We show that the mixed H2/H∞ control problem can be efficiently solved using randomized algorithms. Q-parameterization provides a mechanism to search over all stabilizing controllers, and thus gives us the ability to search ...
  • [2012-03-24] Rate-Limited Stabilization for Network Control Systems 

    Abdallah, Chaouki T.; Lopez, I.
    In this paper, we extend results from packet-based control theory, and present sufficient conditions on the rate of a packet network to guarantee asymptotic stability of unstable discrete LTI system, with less inputs than ...
  • [2012-03-30] Real-time streaming over an IEEE 802.11 b based wireless LAN test bed 

    Abdallah, Chaouki T.; Raghavan, Sunil; Jardin, Ramiro; Jerez, Hemy N.
    Wireless LAN systems based on IEEE 802.11 (see http://grouper.ieee.org/groups/802/11) have become a path-breaking innovation and have revolutionized the home, educational and office network markets (Kapp, S., IEEE Internet ...
  • [2012-03-27] Recent Advances on Linear Control Theory under Communication Constraints: A Survey 

    Abdallah, Chaouki T.; Lopez, Ivan
    Recent developments in networked control systems have focused on the issue of communications constraints. In this paper, we summarize the main results for stabilization and performance of networked control systems from an ...
  • [2006-03-10] Recursive Digital Filter Synthesis in the Time Domain 

    Brophy, Francis; Salazar, Andres C.
  • [2012-04-24] The recursive neural network 

    Abdallah, Chaouki T.; Hush, Don; Horne, Bill
    This paper describes a special type of dynamic neural network called the Recursive Neural Network (RNN). The RNN is a single-input single-output nonlinear dynamical system with three subnets, a nonrecursive subnet and two ...
  • [2012-04-19] Recursive neural networks for signal processing and control 

    Abdallah, Chaouki T.; Hush, Don; Horne, B.
    The authors describe a special type of dynamic neural network called the recursive neural network (RNN). The RNN is a single-input single-output nonlinear dynamical system with a nonrecursive subnet and two recursive subnets ...