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Browsing by Subject "Stability"

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    • Conference Object  

      Abrupt and incipient fault isolation of nonlinear uncertain systems 

      Zhang, Xiaodong; Polycarpou, Marios M.; Parisini, T. (2000)
      This paper presents a robust fault diagnosis scheme for abrupt and incipient faults in nonlinear uncertain dynamical systems. A detection and approximation estimator is used for online health monitoring. Once a fault is ...

    • Article  

      Autonomous intelligent cruise control using front and back information for tight vehicle following maneuvers 

      Zhang, Y.; Kosmatopoulos, Elias B.; Ioannou, Petros A.; Chien, C. C. (1999)
      During manual driving, most human drivers often use information about the speed and position of the preceding and following vehicles in order to adjust the position and speed of their vehicles. The purpose of this paper ...

    • Article  

      Backward difference formulae for Kuramoto–Sivashinsky type equations 

      Akrivis, Georgios; Smyrlis, Yiorgos-Sokratis (2017)
      We analyze the discretization of the periodic initial value problem for Kuramoto–Sivashinsky type equations with Burgers nonlinearity by implicit–explicit backward difference formula (BDF) methods, establish stability and ...

    • Article  

      Comparing intracellular stability and targeting of sulfobetaine quantum dots with other surface chemistries in live cells 

      Muro, E.; Fragola, A.; Pons, T.; Lequeux, N.; Ioannou, Androulla; Skourides, Paris A.; Dubertret, B. (2012)
      The in vivo labeling of intracellular components with quantum dots (QDs) is very limited because of QD aggregation in the cell cytoplasm and/or QD confinement into lysosomal compartments. In order to improve intracellular ...

    • Conference Object  

      Decentralized fault accommodation of a class of interconnected nonlinear systems using an adaptive approximation approach 

      Panagi, P.; Polycarpou, Marios M. (2009)
      This paper presents a decentralized adaptive approximation design for the fault tolerant control of interconnected subsystems. We consider faults that occur in the subsystems local dynamics as well as in the interconnection ...

    • Conference Object  

      Decentralized Reconfigurable Control for Large-Scale Systems with Application to a Segmented Telescope Test-Bed 

      Abdullah, A. A.; Ioannou, Petros A. (2003)
      Designing a decentralized reconfigurable control (DRC) system is considered for large-scale systems. The objective of the DRC system is to achieve performance requirements under normal and sensor failure situations. The ...

    • Article  

      Existence and stability of traveling discrete shocks 

      Smyrlis, Yiorgos-Sokratis; Yu, S. H. (1997)
      We are concerned with existence and stability questions for finite difference schemes approximating solutions of scalar conservation laws with shocks. A suitable model for the study of the artifacts created by these schemes ...

    • Article  

      Flow instabilities of Herschel-Bulkley fluids 

      Alexandrou, Andreas N.; Le Menn, P.; Georgiou, Georgios C.; Entov, V. (2003)
      We investigate numerically the interactions of two-dimensional jets of Bingham plastic and Herschel-Bulkley fluids with a vertical surface at a distance from the die exit. This problem simulates the early stages of filling ...

    • Article  

      Flow instabilities of Herschel-Bulkley fluids 

      Alexandrou, Andreas N.; Menn, P. Le; Georgiou, G.; Entov, V. (2003)
      We investigate numerically the interactions of two-dimensional jets of Bingham plastic and Herschel-Bulkley fluids with a vertical surface at a distance from the die exit. This problem simulates the early stages of filling ...

    • Article  

      Global asymptotic stability of max-min congestion control schemes 

      Lestas, Marios; Ioannou, Petros A.; Pitsillides, Andreas; Hadjipollas, George (2017)
      A number of congestion control schemes which adopt the max-min fairness criterion and do not require maintenance of per flow states within the network have been proposed in the literature. The establishment of global ...

    • Article  

      High-order neural network structures for identification of dynamical systems 

      Kosmatopoulos, E. B.; Polycarpou, Marios M.; Christodoulou, M. A.; Ioannou, P. A. (1995)

    • Article  

      The impact of network structure on the stability of greedy protocols 

      Koukopoulos, D.; Mavronicolas, Marios; Nikoletseas, Sotiris E.; Spirakis, Paul G. (2003)
      A packet-switching network is stable if the number of packets in the network remains bounded at all times. A very natural question that arises in the context of stability and instability properties of such networks is how ...

    • Conference Object  

      Long-time Stability of Mg2(Si-Sn-Ge) - Based Thermoelectrics Under Large Temperature Gradient Conditions 

      Burkov, A. T.; Konstantinov, P. P.; Fedorov, M. I.; Manoli, M.; Kyratsi, Theodora; Tarantik, K.; Jaegle, M. (Elsevier Ltd, 2015)
      We study the thermoelectric properties and stability of Mg2(Si-Sn-Ge) composite, prepared by a combination of ball milling process and heating treatment followed by Spark Plasma Sintering and densification. The goal of ...

    • Article  

      LQG optimality and separation principle for general discrete time partially observed stochastic systems over finite capacity communication channels 

      Charalambous, Charalambos D.; Farhadi, A. (2008)
      This paper is concerned with control of stochastic systems subject to finite communication channel capacity. Necessary conditions for reconstruction and stability of system outputs are derived using the Information ...

    • Conference Object  

      Neural networks as on-line approximators of nonlinear systems 

      Polycarpou, Marios M.; Ioannou, P. A. (1992)

    • Doctoral Thesis  Open Access

      Numerical and semi-analytical solutions of viscoplastic Poiseuille and Couette flows 

      Chatzimina, Maria K. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2009-01)
      Η παρούσα διατριβή περιλαμβάνει τις αριθμητικές και ημι-αναλυτικές λύσεις ιξωδοπλαστικών ροών Poiseuille και Couette. Αρχικά επιλύουμε αριθμητικά διάφορες ροές διακοπής ρευστών Bingham χρησιμοποιώντας το ομαλοποιημένο ...

    • Conference Object  

      On optimal performance for linear time-varying systems 

      Djouadi, S. M.; Charalambous, Charalambos D. (2004)
      In this paper we consider the optimal disturbance attenuation problem and robustness for linear time-varying (LTV) systems. This problem corresponds to the standard optimal H ∞ problem for LTI systems. The problem is ...

    • Article  

      On the combined effects of slip, compressibility, and inertia on the Newtonian extrudate-swell flow problem 

      Kountouriotis, Zacharias; Georgiou, Georgios C.; Mitsoulis, Evan C. (2013)
      We solve both the planar and axisymmetric extrudate-swell flows of a compressible Newtonian liquid with Navier slip at the wall, using the finite-element method in space and a fully-implicit finite-difference scheme in ...

    • Article  

      On the stability of compositions of universally stable, greedy contention-resolution protocols 

      Koukopoulos, D.; Mavronicolas, Marios; Nikoletseas, Sotiris E.; Spirakis, Paul G. (2002)
      A distinguishing feature of today’s large-scale platforms for distributed computation and communication, such as the Internet, is their heterogeneity, predominantly manifested by the fact that a wide variety of communication ...

    • Article  

      On the stability of the simple shear flow of a Johnson-Segalman fluid 

      Georgiou, Georgios C.; Vlassopoulos, Dimitris (1998)
      We solve the time-dependent simple shear flow of a Johnson-Segalman fluid with added Newtonian viscosity. We focus on the case where the steady-state shear stress/shear rate curve is not monotonic. We show that, in addition ...

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