• Conference Object  

      Adaptive bounding techniques for stable neural control systems 

      Polycarpou, Marios M.; Ioannou, Petros A. (IEEE, 1995)
      This paper considers the design of stable adaptive neural controllers for uncertain nonlinear dynamical systems with unknown nonlinearities. The Lyapunov synthesis approach is used to develop state-feedback adaptive control ...
    • Article  

      Adaptive congestion control in ATM based networks: Quality of service and high utilisation 

      Pitsillides, Andreas; Lambert, J. (1997)
      To improve network utilisation and robustness for Asynchronous Transfer Mode (ATM) networks there is increasing evidence that reactive congestion controls are necessary. However the large bandwidth-delay product and the ...
    • Conference Object  

      Congestion control in differentiated services networks using fuzzy logic 

      Chrysostomou, Chrysostomos; Pitsillides, Andreas; Hadjipollas, George; Polycarpou, Marios M.; Sekercioglu, Y. Ahmet (2004)
      The provision of quality of service (QoS) in a differentiated services (Diff-Serv) environment requires an adequate differentiation between high-priority/assured and low-priority/best-effort classes of service in 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  

      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-dimensional nonlinear output feedback dynamic games and bounds for sector nonlinearities 

      Charalambous, Charalambos D.; Elliott, R. J. (1999)
      In general, nonlinear output feedback dynamic games are infinite-dimensional. This paper treats a class of minimax games when the nonlinearities enter the dynamics of the unobservable states. An information state approach ...
    • Conference Object  

      A heuristic search algorithm for maneuvering of UAVs across dense thermal areas 

      Kahveci, N. E.; Ioannou, Petros A.; Mirmirani, M. D. (2007)
      In order to ensure that an aircraft has the potential to meet the assigned performance requirements which are often mission specific, the particular aerodynamic demands involved must be taken into account during the aircraft ...
    • Article  

      Information Transfer of Control Strategies: Dualities of Stochastic Optimal Control Theory and Feedback Capacity of Information Theory 

      Charalambous, Charalambos D.; Kourtellaris, C. K.; Tzortzis, I. (2017)
      The control-coding capacity of stochastic control systems is introduced, and its operational meaning is established using randomized control strategies, which simultaneously control output processes encode information, and ...
    • Article  

      Joint preprocessing and feedback strategies for perfectly reconstructing equalizers 

      Touri, R.; Voulgaris, P.; Hadjicostis, Christoforos N. (2008)
      In this paper we consider the transmission of discrete-valued data via a communication channel that is subject to (additive) noise with a known upper bound on its magnitude but otherwise completely unrestricted and unknown ...
    • Article  

      Low-threshold lasers based on a high-mobility semiconducting polymer 

      Heliotis, G.; Choulis, Stelios A.; Itskos, Grigorios; Xia, R.; Murray, R.; Stavrinou, P. N.; Bradley, D. D. C. (2006)
      Progress toward electrically driven conjugated polymer lasers should benefit from the identification of materials that exhibit good charge transport properties coupled with large optical gain. Here, we report a detailed ...
    • Conference Object  

      MIMO disturbance and plant uncertainty attenuation by feedback 

      Djouadi, S. M.; Charalambous, Charalambos D. (2002)
      This paper investigates the ability of feedback to reduce plant and disturbance uncertainties in the MIMO case, by solving two fundamental problems posed by Zames in the late seventies. The approach used here is Banach ...
    • Conference Object  

      Neural network control of unknown systems 

      Kosmatopoulos, Elias B.; Chassiakos, Anastassios; Boussalis, Helen R.; Mirmirani, Maj; Ioannou, Petros A. (IEEE, 1998)
      In this paper, we show that for all unknown Multi-Input (MI) nonlinear system that affected by external disturbances, it is possible to construct a semi-global state-feedback stabilizer when the only information about the ...
    • Conference Object  

      Non-identifier based adaptive control scheme with guaranteed stability 

      Zhang, J.; Ioannou, Petros A. (2006)
      In this paper, we investigate a non-identifier based adaptive control scheme for single-input single-output (SISO) plants. The overall adaptive control system can be viewed as a feedback interconnection of a SISO plant, a ...
    • Article  

      Novel Matrix Singular Value Inequalities and Their Applications to Uncertain MIMO Channels 

      Loyka, S.; Charalambous, Charalambos D. (2015)
      Novel matrix singular value inequalities are established for a sum/product of three matrices. Their application to the uncertain (compound) multiple-input multiple-output (MIMO) channel subject to normed additive uncertainty ...
    • Conference Object  

      On a hybrid model for max-min congestion controllers 

      Lestas, Marios; Ioannou, Petros A.; Pitsillides, Andreas (2004)
      In this paper we address the congestion control problem in computer networks offering a single class of best effort service. The problem is viewed as a resource allocation problem. The objective is to distribute the available ...
    • Conference Object  

      On a hybrid model for max-min congestion controllersAAA 

      Lestas, Marios; Ioannou, Petros A.; Pitsillides, Andreas (2004)
      In this paper we address the congestion control problem in computer networks offering a single class of best effort service. The problem is viewed as a resource allocation problem. The objective is to distribute the available ...
    • 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  

      Output feedback risk-sensitive control and dynamic games: Small noise limits 

      Charalambous, Charalambos D. (IEEE, 1997)
      This paper employs logarithmic transformations to establish relations between continuous-time nonlinear partially observable risk-sensitive control problems and analogous output feedback dynamic games.
    • Conference Object  

      Real-Time Control of a Segmented Telescope Test-Bed 

      Abdullah, A. A.; Ioannou, Petros A. (2003)
      The control of large segmented telescopes is a challenging one due to the complexity and high order of the system. The high order dynamics lead to high order controllers that require more memory and faster computations for ...
    • Article  

      Robust adaptive control of minimum phase non-linear systems 

      Johansen, T. A.; Ioannou, Petros A. (1996)
      We show that an adaptive input/output feedback linearization control scheme for minimum phase nonlinear systems is robust with respect to unstructured plant uncertainties such as unmodelled dynamics and disturbances provided ...