• Conference Object  

      Determining model accuracy as a function of inputs and system parameters 

      Sohns, B. J.; Stein, J. L.; Louca, Loucas S. (American Society of Mechanical Engineers (ASME), 2004)
      Vital to the effectiveness of simulation-based design is having a system model of known quality. Previous research introduced an algorithm called AVASIM for assessing model validity systematically and quantitatively. AVASIM ...
    • Conference Object  

      Dynamic demographic models and parameter identification: Simulations based on statistical data 

      Tzortzis, I.; Charalambous, Charalambos D. (Institute of Electrical and Electronics Engineers Inc., 2014)
      This paper is concerned with dynamical population models obtained from short and long-term changes in size and age composition due to demographic processes such as births, deaths, migration, etc. Both deterministic and ...
    • Conference Object  

      Estimation and identification of time-varying long-term fading wireless channels with application to power control 

      Olama, M. M.; Jaladhi, K. K.; Djouadi, S. M.; Charalambous, Charalambos D. (Institute of Electrical and Electronics Engineers Inc., 2007)
      This paper is concerned with modeling of time-varying wireless fading channels, parameter estimation, identification, and optimal power control from received signal measurements. Wireless channels are represented by ...
    • 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  

      Fault model identification and synthesis in Petri nets 

      Cabasino, M. P.; Giua, A.; Hadjicostis, Christoforos N.; Seatzu, C. (2015)
      Fault identification studies in the Discrete Event Systems literature are typically model-based and require knowledge of the structure of the system, including the nature (and behavior) of the possible faults. In this paper ...
    • Conference Object  

      Finite-State Machine Embeddings for Non-Concurrent Error Detection and Identification 

      Hadjicostis, Christoforos N. (2003)
      In digital sequential systems that operate over several time steps, a state-transition fault at any time step during the operation of the system corrupts its state in a way that can render its future functionality useless. ...
    • Conference Object  

      Identification of hysteretic systems using the differential evolution algorithm 

      Kyprianou, Andreas; Worden, K. (Affiliation: Dept. of Mechanichal Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United KingdomCorrespondence Address: Kyprianou, A.Dept. of Mechanichal Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdomemail: Mep96Gak@sheffield.ac.uk, 1998)
      In system identification, it is well-known that any non-linear in the parameters system, possesses a complicated error surface with many local minima. In this case the conventional algorithms, such as those based on least ...
    • 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  

      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 ...
    • Article  

      Periodic and non-concurrent error detection and identification in one-hot encoded FSMs 

      Hadjicostis, Christoforos N. (2004)
      State-transition faults in digital sequential systems, such as finite-state logic controllers, have traditionally been handled by embedding the given system into a larger one, in a way that preserves the state evolution ...
    • Article  

      Systematic identification of decoupling in dynamic system models 

      Rideout, D. G.; Stein, J. L.; Louca, Loucas S. (2007)
      This paper proposes a technique to quantitatively and systematically search for decoupling among elements of a dynamic system model, and to partition models in which decoupling is found. The method can validate simplifying ...
    • Conference Object  

      Time varying wireless channel modeling, estimation, identification, and power control from measurements 

      Olama, M. M.; Yanyan, L.; Djouadi, S. M.; Charalambous, Charalambos D. (2007)
      This paper is concerned with a time-varying wireless channel modeling, its parameter estimation, system identification, and optimal power control from measurement data. The channel model is represented in state space form, ...
    • Conference Object  

      Wireless fading channels: Modeling, estimation and identification from measurements 

      Charalambous, Charalambos D.; Bultitude, R. J. C.; Zhan, J.; Papageorgiou, I. G. (2005)
      This paper is concerned with modeling and system identification of wireless channels. The models employed are in state space form, while the identification method uses the Expectation-Maximization (EM) algorithm and Kalman ...