• Conference Object  

      Distributed function calculation via linear iterations in the presence of malicious agents - Part II: Overcoming malicious behavior 

      Sundaram, S.; Hadjicostis, Christoforos N. (2008)
      Given a network of interconnected nodes, each with a given initial value, we develop a distributed strategy that enables some or all of the nodes to calculate any arbitrary function of these initial values, despite the ...
    • Conference Object  

      Examples of optimal control for nonlinear stochastic control problems with partial information 

      Charalambous, Charalambos D.; Elliott, Robert J. (IEEE, 1995)
      Partially observable stochastic optimal control problems are considered. It is shown, via an information state approach and dynamic programming, that several classes of nonlinear systems with non-linearities in the dynamics ...
    • Conference Object  

      Fault-tolerant semi fast implementations of atomic read/write registers 

      Georgiou, Chryssis; Nicolaou, Nicolas C.; Shvartsman, A. A. (2006)
      This paper investigates time-efficient implementations of atomic read-write registers in message-passing systems where the number of readers can be unbounded. In particular we study the case of a single writer, multiple ...
    • Conference Object  

      First passage risk-sensitive criterion for stochastic evolutions 

      Charalambous, Charalambos D.; Hibey, Joseph L. (1995)
      The purpose of this paper is to investigate in an infinite dimensional space, the first passage problem with a risk-sensitive performance criterion, and to illustrate the asymptotic behavior of the associated value function, ...
    • Article  

      Marking observer in labeled petri nets with application to supervisory control 

      Cabasino, M. P.; Hadjicostis, Christoforos N.; Seatzu, C. (2017)
      In this paper, we consider the problem of marking estimation in labeled Petri nets whose initial marking is known to belong to a given convex set, in the presence of silent transitions (i.e., transitions labeled with the ...
    • Conference Object  

      Marking observer of labeled petri nets with uncertainty in the initial marking 

      Cabasino, M. P.; Seatzu, C.; Hadjicostis, Christoforos N. (2013)
      In this paper we consider marking estimation in labeled Petri nets whose initial marking is known to belong to a given convex set. We allow for silent transitions (i.e., transitions labeled with the empty word) and ...
    • Conference Object  

      Minimizing outage probability for a class of MIMO channels 

      Charalambous, Charalambos D.; Ioannou, I. (2009)
      In this paper we investigate the outage probability of Multiple-Input Multiple-Output (MIMO) channels, when the probability distribution of the channel gains is not completely known to the transmitter and receiver. The ...
    • Conference Object  

      Modeling change of haplotype distributions in random mating populations using random sets 

      Raji-Kermany, A.; Charalambous, Charalambos D.; Hickey, D. (2004)
      Several mathematical models have been developed to describe the genetic structure of populations. Most of these models focus on only one, or few genetic loci. In this paper, we develop a model to describe a large number ...
    • Article  

      Optimal measurement strategy for nonlinear filtering 

      Ahmed, N. U.; Charalambous, Charalambos D. (2006)
      In this paper we consider the question of an optimal measurement strategy for nonlinear filtering. Given a set of measurement and observation options, the problem faced by a designer is to choose the option that gives the ...
    • Conference Object  

      Optimization of fully observable nonlinear stochastic uncertain controlled diffusion: Monotonicity properties and optimal sensitivity 

      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 fully observable nonlinear stochastically controlled diffusions, in which uncertainty is described by a relative entropy constraint between the nominal measure and the uncertain measure, while ...
    • Conference Object  

      Optimization of fully observable nonlinear stochastic uncertain controlled diffusion: Monotonicity properties and optimal sensitivity 

      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 fully observable nonlinear stochastically controlled diffusions, in which uncertainty is described by a relative entropy constraint between the nominal measure and the uncertain measure, while ...
    • Conference Object  

      Optimization of fully observable nonlinear stochastic uncertain controlled diffusion: Monotonicity properties and optimal sensitivity 

      Rezaei, F.; Charalambous, Charalambos D.; Kyprianou, Andreas (2004)
      This paper is concerned with fully observable nonlinear stochastically controlled diffusions, in which uncertainty is described by a relative entropy constraint between the nominal measure and the uncertain measure, while ...
    • Conference Object  

      Optimization of Stochastic Uncertain Systems: Large Deviations and Robustness 

      Charalambous, Charalambos D.; Rezaei, F. (2003)
      This paper is concerned with an abstract formulation of stochastic uncertain control systems, in which the pay-off is described by the relative entropy between the nominal measure and the uncertain measure, while the ...
    • Conference Object  

      Probabilistic fault detection in finite-state machines based on state occupancy measurements 

      Hadjicostis, Christoforos N. (2002)
      This paper discusses a probabilistic methodology for detecting permanent or transient functional changes in the state-transition mechanism of a deterministic finite-state machine (FSM). The associated detector observes the ...
    • Conference Object  

      Reconstruction of transition firing sequences based on asynchronous observations of place token changes 

      Hadjicostis, Christoforos N.; Li, L. (2007)
      This paper proposes a methodology for reconstructing the possible transition firing sequences in a given Petri net based on asynchronous observations of token changes at different places of the Petri net. The observed ...
    • Conference Object  

      Risk-sensitive/integral control for systems with point process observations 

      Charalambous, Charalambos D.; Hibey, Joseph L. (IEEE, 1994)
      This paper deals with necessary conditions for integral and exponential-of-integral cost functions, when the signal is a controlled diffusion process, and the observations consist of continuous and discontinuous processes. ...
    • Conference Object  

      State feedback control of labeled Petri nets with uncertainty in the initial marking 

      Cabasino, M. P.; Hadjicostis, Christoforos N.; Seatzu, C. (Institute of Electrical and Electronics Engineers Inc., 2014)
      In this paper we consider the problem of designing a state feedback controller for a labeled Petri net whose initial marking is known to belong to a given convex set. We allow for silent transitions (i.e., transitions ...
    • Article  

      Structural controllability and observability of linear systems over finite fields with applications to multi-agent systems 

      Sundaram, S.; Hadjicostis, Christoforos N. (2013)
      We develop a graph-theoretic characterization of controllability and observability of linear systems over finite fields. Specifically, we show that a linear system will be structurally controllable and observable over a ...
    • Article  

      Voronoi games on cycle graphs 

      Mavronicolas, Marios; Monien, Burkhard; Lesta, Vicky Papadopoulou; Schoppmann, F. (2008)
      In a Voronoi game, each of a finite number of players chooses a point in some metric space. The utility of a player is the total measure of all points that are closer to him than to any other player, where points equidistant ...