Now showing items 126-145 of 229

  • [2012-03-29] Necessary and sufficient conditions for finite-time stability of linear systems 

    Abdallah, Chaouki T.; Amato, F.; Ariola, M.; Cosentino, C.; Dorato, P.
    In this paper we consider the finite-time stability and finite-time boundedness problems for linear systems subject to exogenous disturbances. The main results of the paper are some necessary and sufficient conditions, ...
  • [2006-03-10] Network Management Systems for Data Communications 

    Salazar, Andres C.; Scarfo, Phil; Horn, Robert
  • [2012-03-30] Networked control systems: a sampled-data approach 

    Abdallah, Chaouki T.; Hokayem, Peter E.
    Browse > Conferences> Intelligent Control. 2003 IEEE ... Networked control systems: a sampled-data approach .1254671 abstract . Hokayem, P.F.; Abdallah, C.T.; Dept. of EECE, Univ. of New Mexico, Albuquerque, ...
  • [2012-04-12] Neural networks in fault detection: a case study 

    Abdallah, Chaouki T.; Hush, D.R.; Heileman, G.L.; Docampo, D.
    We study the applications of neural nets in the area of fault detection in real vibrational data. The study is one of the first to include a large set of real vibrational data and to illustrate the potential as well as the ...
  • [2012-04-13] A neural-network model of the input/output characteristics of a high-power backward wave oscillator 

    Abdallah, Chaouki T.; Yang, Wei; Schamiloglu, Edl; Moreland, Larald D.
    This paper discusses an approach to model the input/output characteristics of the Sinus-6 electron beam accelerator-driven backward wave oscillator. Since the Sinus-6 is extremely fast to warrant the inclusion of dynamical ...
  • [2012-03-29] New Approaches to High Power Microwave Computation and Experimentation 

    Abdallah, Chaouki T.; Schamiloglu, EdI
    This final technical report describes the conclusion of effort on the New World Vistas grant entitled "New Approaches to High Power Microwave Computation and Experimentation.' In the final year of effort we focused on ...
  • [2012-04-19] New extreme-point robust stability results for discrete-time polynomials 

    Abdallah, Chaouki T.; Perez, F.; Docampo, D.
    This paper provides some new extreme-point robust-stability results for discrete-time polynomials with special uncertainties in the coefficient space. The proofs, obtained using the barycentric coordinates, are simple and ...
  • [2012-04-13] Nonlinear observer design using dynamic recurrent neural networks 

    Abdallah, Chaouki T.; Kim, Young H.; Lewis, Frank L.
    A nonlinear observer for a general class of single-output nonlinear systems is proposed based on a generalized dynamic recurrent neural network (DRNN). The neural network (NN) weights in the observer are tuned online, with ...
  • [2012-03-29] Nonlinear stability analysis for non-polynomial systems 

    Abdallah, Chaouki T.; Mastellone, S.; Hokayem, P.F.; Dorato, Peter
    In this paper the stability analysis of nonlinear systems is studied through different approaches. The main idea of the paper is to map the original class of nonlinear systems into a smaller subclass of systems described ...
  • [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 ...