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Browsing by Subject "Discrete time control systems"

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    • Conference Object  

      Action functional stochastic H∞ estimation for nonlinear discrete time systems 

      Charalambous, Charalambos D.; Farhadi, A.; Djouadi, S. M. (2002)
      This paper presents an action functional, sample path optimization technique, for formulating and solving nonlinear discrete-time stochastic H∞ estimation problems. These H∞ problems are formulated as minimax dynamic games ...

    • Article  

      Algebraic approaches for fault identification in discrete-event systems 

      Wu, Y.; Hadjicostis, Christoforos N. (2005)
      In this note, we develop algebraic approaches for fault identification in discrete-event systems that are described by Petri nets. We consider faults in both Petri net transitions and places, and assume that system events ...

    • Article  

      Coding approaches to fault tolerance in linear dynamic systems 

      Hadjicostis, Christoforos N.; Verghese, G. C. (2005)
      This paper discusses fault tolerance in discrete-time dynamic systems, such as finite-state controllers or computer simulations, with focus on the use of coding techniques to efficiently provide fault tolerance to linear ...

    • Conference Object  

      Control of discrete-time partially-observed jump linear systems over causal communication systems 

      Denic, S. Z.; Charalambous, Charalambos D. (2006)
      We consider the problem of control of discrete-time partially-observed jump linear system over a noisy causal communication channel. Necessary conditions for observability and stabilizability in probability and r-th mean ...

    • Conference Object  

      Discrete-time risk-sensitive filters with non-Gaussian initial conditions and their ergodic properties 

      Dey, Subhrakanti; Charalambous, Charalambos D. (IEEE, 1999)
      In this paper, we study asymptotic stability properties of risk-sensitive filters with respect to their initial conditions. In particular, we consider a linear time-invariant systems with initial conditions that are not ...

    • Conference Object  

      Discrete-time stochastic minimax control of partially observable systems 

      Charalambous, Charalambos D. (2001)
      This paper presents a sample path optimization technique, as an alternative to the ensample average in formulating and solving stochastic minimax dynamic games. The stochastic games are nonlinear, discrete-time, and partially ...

    • Article  

      The evaluation of the Cultural Journeys in the Information Society environment as an educational aid 

      Fakas, Georgios John; Lamprianou, Iasonas; Andreou, Andreas S.; Pampaka, Maria; Schizas, Christos N. (2005)
      The Cultural Journeys in the Information Society is a dynamic hypermedia environment, which proposes the Electronic Roads as a meta-form for exploring cultural information that can form Cultural Journeys. The Electronic ...

    • Conference Object  

      Feedback control over packet dropping network links 

      Mo, H.; Hadjicostis, Christoforos N. (2007)
      This paper studies stabilization schemes for a discrete-time control systems in which the feedback loop includes a network link that may suffer packet drops. We model the packet dropping network link as an erasure channel ...

    • Conference Object  

      Feedback control utilizing packet dropping network links 

      Hadjicostis, Christoforos N.; Touri, R. (2002)
      The increasing availability of network connectivity has prompted the study of computer-based control methodologies that are implemented centrally or distributively using existing network infrastructure as the communications ...

    • Article  

      Finite-time disturbance attenuation control problem for singularly perturbed discrete-time systems 

      Abdelrahman, M. A.; Naidu, D. S.; Charalambous, Charalambos D.; Moore, K. L. (1998)
      In this paper we consider the problem of finite-time H∞-optimal control of linear, singularly perturbed, discrete-time systems. The problem is addressed from the game theoretic approach. This leads to a singularly perturbed, ...

    • Conference Object  

      H∞-optimal control of singularly perturbed discrete-time systems, and risk-sensitive control 

      Naidu, D. Subbaram; Charalambous, Charalambos D.; Moore, Kevin L.; Abdelrahman, M. A. (IEEE, 1994)
      The H∞-optimal control and risk-sensitive control of linear singularly perturbed, discrete-time systems is described. It is shown that the Riccati equation associated with the solution of the H∞-optimal control problem, ...

    • Conference Object  

      Maximum likelihood diagnosis in partially observable finite state machines 

      Athanasopoulou, E.; Hadjicostis, Christoforos N. (2005)
      In this paper we develop a probabilistic approach for fault diagnosis in deterministic finite state machines (FSMs). The proposed approach determines whether the FSM under consideration is faulty or not by observing (part ...

    • Article  

      Modeling and control design for a computer-controlled brake system 

      Raza, H.; Xu, Z.; Yang, B.; Ioannou, Petros A. (1997)
      The brake subsystem is one of the most significant parts of a vehicle with respect to safety. A computer-controlled brake system has the capability of acting faster than the human driver during emergencies, and therefore ...

    • Article  

      Multiple model adaptive mixing control: The discrete-time case 

      Baldi, S.; Ioannou, Petros A.; Mosca, E. (2012)
      Most of the work in multiple model adaptive control with various forms of switching focused on continuous-time systems. The purpose of this technical note is to extend the results of one approach, the adaptive mixing control ...

    • Conference Object  

      Non-concurrent error detection and correction in discrete-time LTI dynamic systems 

      Hadjicostis, Christoforos N. (2001)
      In this paper we develop fault-tolerant constructions for discrete-time (DT) linear time-invariant (LTI) dynamic systems that are build out of appropriately interconnected delay, adder and gain elements. More specifically, ...

    • Conference Object  

      Non-concurrent fault identification in discrete event systems using encoded Petri net states 

      Wu, Y.; Hadjicostis, Christoforos N. (2002)
      In this paper we extend a previously developed coding-based methodology for monitoring faults in discrete event systems that are described by Petri nets. We present a systematic design that enables us to non-concurrently ...

    • Conference Object  

      Nonconcurrent error correction in the presence of roundoff noise 

      Takos, G.; Hadjicostis, Christoforos N. (2006)
      This paper analyzes the effects of roundoff noise on our ability to nonconcurrently detect and identify transient faults that corrupt state variables during the operation of a fault-tolerant discrete-time (DT) linear ...

    • Article  

      Nonconcurrent error detection and correction in fault-tolerant discrete-time LTI dynamic systems 

      Hadjicostis, Christoforos N. (2003)
      This paper develops resource-efficient alternatives to modular redundancy for fault-tolerant discrete-time (DT) linear time-invariant (LTI) dynamic systems. The proposed method extends previous approaches that are based ...

    • Conference Object  

      On multiobjective H2/H∞ optimal control 

      Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2001)
      In this paper the solutions to the optimal multiobjective H2/H∞ problem are characterized using Banach space duality theory, and shown to satisfy a flatness or allpass condition. Dual and predual spaces are identified, and ...

    • Conference Object  

      Optimal stochastic control of discrete-time systems subject to total variation distance uncertainty 

      Charalambous, Charalambos D.; Rezaei, F.; Tzortzis, I. (2010)
      This paper presents another application of the results in [1], [2], where existence of the maximizing measure over the total variation distance constraint is established, while the maximizing pay-off is shown to be equivalent ...

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