• Conference Object  

      Control of tele-operation systems subject to capacity limited channels and uncertainty 

      Farhadi, A.; Charalambous, Charalambos D. (2007)
      This paper is concerned with asymptotic observability and stabilizability of dynamical systems over communication channels subject to limited transmission capacity constraint and uncertainty. In particular, the following ...
    • Conference Object  

      Fault detection and identification in Petri net controllers 

      Li, L.; Hadjicostis, Christoforos N.; Sreenivas, R. S. (2004)
      This paper proposes a methodology for providing fault tolerance to Petri net controllers. In order to provide tolerance against faults that may compromise the functionality of the Petri net controller, we construct a ...
    • Article  

      Finite-state machine embeddings for nonconcurrent error detection and identification 

      Hadjicostis, Christoforos N. (2005)
      In digital sequential systems that operate over several time steps, a state-transition fault at any time step during the operation of the system can corrupt its state and render its future functionality useless. Such ...
    • Conference Object  

      A mathematical framework for robust control over uncertain communication channels 

      Charalambous, Charalambos D.; Farhadi, A. (2005)
      In this paper, a mathematical framework for studying robust control over uncertain communication channels is introduced. The theory is developed by 1) Generalizing the classical information theoretic measures to the robust ...
    • Conference Object  

      Multiobjective H2/H∞ by banach space operator theory 

      Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2001)
      In this paper Banach space duality theory and operator theory are combined to show that the optimal performance index in the multiobjective H2/H∞ is equal to the operator induced norm of a particular operator. This operator ...
    • Conference Object  

      Optimal preprocessing strategies for perfect reconstruction of binary signals under power-constrained transmission 

      Voulgaris, P. G.; Hadjicostis, Christoforos N. (2004)
      In this paper we further explore our deterministic worst-case framework for perfect reconstruction of discrete data transmissions through dispersive communication channels. Specifically, we are concerned with perfect ...
    • Conference Object  

      Optimization of nonlinear stochastic uncertain relaxed controlled systems: Entropy rate functional and robustness 

      Rezaei, F.; Charalambous, C. D.; Kyprianou, Andreas (Affiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, CanadaAffiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 161 Louis Pasteur, A519, Ottawa, Ont. K1N 6N5, CanadaAffiliation: Electrical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusAffiliation: Mechanical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusCorrespondence Address: Rezaei, F.Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, Canadaemail: frezaei@site.uottawa.ca, 2004)
      This paper is concerned with nonlinear stochastic uncertain relaxed controlled difussions, in which the pay-off is described by the relative entropy between the nominal measure and the uncertain measure, when the uncertain ...
    • Conference Object  

      Optimization of nonlinear stochastic uncertain relaxed controlled systems: Entropy rate functional and robustness 

      Rezaei, F.; Charalambous, Charalambos D.; Kyprianou, Andreas (Affiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, CanadaAffiliation: Sch. of Info. Technol. and Eng., University of Ottawa, 161 Louis Pasteur, A519, Ottawa, Ont. K1N 6N5, CanadaAffiliation: Electrical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusAffiliation: Mechanical Engineering Department, University of Cyprus, 75 Kallipoleos Avenue, Nicosia, CyprusCorrespondence Address: Rezaei, F.Sch. of Info. Technol. and Eng., University of Ottawa, 800 King Edward Ave., Ottawa, Ont. K1N 6N5, Canadaemail: frezaei@site.uottawa.ca, 2004)
      This paper is concerned with nonlinear stochastic uncertain relaxed controlled difussions, in which the pay-off is described by the relative entropy between the nominal measure and the uncertain measure, when the uncertain ...
    • Conference Object  

      Optimization of nonlinear stochastic uncertain relaxed controlled systems: Entropy rate functional and robustness 

      Rezaei, F.; Charalambous, Charalambos D.; Kyprianou, Andreas (2004)
      This paper is concerned with nonlinear stochastic uncertain relaxed controlled difussions, in which the pay-off is described by the relative entropy between the nominal measure and the uncertain measure, when the uncertain ...
    • Conference Object  

      Optimization of stochastic uncertain systems with variational norm constraints 

      Rezaei, F.; Charalambous, Charalambos D.; Ahmed, N. U. (2007)
      This paper considers optimization of stochastic uncertain systems on general abstract spaces, when the uncertainty of the system is described by a variational norm constraint. The pay-off is defined as a linear functional ...
    • Article  

      Power control in wireless systems: A stochastic control formulation 

      Huang, M.; Caines, P. E.; Charalambous, Charalambos D.; Malhamé, R. P. (2001)
      This paper considers power control for log-normal fading channels. A rate based power set point control model and an associated performance measure are introduced. Within this framework, a unique stochastic optimal power ...
    • Article  

      Quantization of FIR Filters Under a Total Integer Cost Constraint 

      Llorens, A. J.; Hadjicostis, Christoforos N.; Ni, H. C. (2005)
      In this paper, we present computationally efficient algorithms for obtaining a particular class of optimal quantized representations of finite-impulse response (FIR) filters. We consider a scenario where each quantization ...
    • Conference Object  

      Robust control of a class of feedback systems subject to limited capacity constraints 

      Farhadi, A.; Charalambous, Charalambos D. (2007)
      In this paper we are concerned with uniform mean square reliable data reconstruction and robust stability for a class of dynamical systems over Additive White Gaussian Noise (AWGN) channels, subject to the limited capacity ...
    • Article  

      Stochastic testing of finite state machines 

      Hadjicostis, Christoforos N. (2001)
      This paper discusses an approach that uses statistical observations about the steady-state behavior of a finite state machine (FSM) in order to detect and identify permanent failures in its state transition mechanism. The ...
    • Article  

      Stochastic uncertain systems subject to relative entropy constraints: Induced norms and monotonicity properties of minimax games 

      Charalambous, Charalambos D.; Rezaei, F. (2007)
      Entropy and relative entropy are fundamental concepts on which information theory is founded on, and in general, telecommunication systems design. On the other hand, dissipation inequalities, minimax strategies, and induced ...
    • Conference Object  

      Systematic model decoupling through assessment of power-conserving constraints - An engine dynamics case study 

      Rideout, G.; Stein, J. L.; Louca, Loucas S. (American Society of Mechanical Engineers (ASME), 2004)
      Simplified models for predicting engine mount forces have traditionally been developed based on the assumption that for a well-balanced low-speed engine, the reciprocating dynamics can be decoupled from the three-dimensional ...