Browsing by Subject "Mathematical operators"

Now showing items 1-11 of 11

    • Article  

      Computational study of the dispersively modified Kuramoto-Sivashinsky equation 

      Akrivis, Georgios; Papageorgiou, Demetrios T.; Smyrlis, Yiorgos-Sokratis (2012)
      We analyze and implement fully discrete schemes for periodic initial value problems for a general class of dispersively modified Kuramoto-Sivashinsky equations. Time discretizations are constructed using linearly implicit ...
    • Conference Object  

      Information states in optimal control of stochastic systems: A Lie algebraic theoretic approach 

      Charalambous, Charalambos D.; Elliott, Robert J. (IEEE, 1997)
      In this paper we introduce the sufficient statistic algebra which is responsible for propagating the sufficient statistic, or information state, in the optimal control of stochastic systems. Using a Lie algebraic formulation, ...
    • Article  

      Lie group analysis of two-dimensional variable-coefficient Burgers equation 

      Ivanova, Nataliya M.; Sophocleous, Christodoulos; Tracinà, Rita (2010)
      The modern group analysis of differential equations is used to study a class of two-dimensional variable coefficient Burgers equations. The group classification of this class is performed. Equivalence transformations are ...
    • Article  

      A multi-objective evolutionary algorithm for the deployment and power assignment problem in wireless sensor networks 

      Konstantinidis, Andreas; Yang, K.; Zhang, Q.; Zeinalipour-Yazdi, Constantinos D. (2010)
      A Wireless Sensor Network (WSN) design often requires the decision of optimal locations (deployment) and transmit power levels (power assignment) of the sensors to be deployed in an area of interest. Few attempts have been ...
    • Conference Object  

      Multiagent reinforcement learning in the iterated prisoner's dilemma: Fast cooperation through evolved payoffs 

      Vassiliades, Vassilis; Christodoulou, Chris C. (2010)
      In this paper, we investigate the importance of rewards in Multiagent Reinforcement Learning in the context of the Iterated Prisoner's Dilemma. We use an evolutionary algorithm to evolve valid payoff structures with the ...
    • Article  

      Multilevel characterizations of anisotropic function spaces 

      Kyriazis, George C. (2005)
      We present a general method for extending decomposition systems of L 2(ℝd) to decomposition systems for the anisotropic Triebel-Lizorkin and Besov spaces, Fp,qα,s and Bp,qα,s, respectively, for the full range of the indexes. ...
    • Conference Object  

      Multiobjective H2/H∞ by banach space operator theory 

      Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2001)
      In this paper Banach space duality theory and operator theory are combined to show that the optimal performance index in the multiobjective H2/H∞ is equal to the operator induced norm of a particular operator. This operator ...
    • Conference Object  

      Quality evaluation of ultrasound imaging in the carotid artery 

      Loizou, Christos P.; Pattichis, Constantinos S.; Istepanian, Robert Sh Habib; Pantzaris, Marios C.; Tyllis, Theodosis K.; Nicolaïdes, Andrew N. (2004)
      Image quality assessment plays an important role in various image-processing applications. In this work we evaluate image quality criteria based on mean square error, signal to noise error, and quality and structural ...
    • Conference Object  

      Role of measure-valued decompositions in stochastic control 

      Charalambous, Charalambos D.; Hibey, Joseph L. (American Automatic Control Council, 1994)
      Following up the measure-valued decompositions of Kunita [1], and the martingale representation result for L2-processes of Bensoussan [2], we have recently derived in [3], necessary conditions of optimizing nonlinear ...
    • Conference Object  

      Soft-decision decoding of linear block codes using preprocessing 

      Wu, Y.; Koetter, R.; Hadjicostis, Christoforos N. (2004)
      Two universally applicable preprocessing rules to improve iterative recoding algorithms, which utilize the most reliable basis (MRB), while focusing on order-w reprocessing, was investigated. The first preprocessing rule ...
    • Article  

      Some aspects of the Method of Fundamental solutions for certain biharmonic problems 

      Smyrlis, Yiorgos-Sokratis; Karageorghis, Andreas (2003)
      In this study, we investigate the application of the Method of Fundamental Solutions for the solution of biharmonic Dirichlet problems on a disk. Modifications of the method for overcoming sources of inaccuracy are suggested. ...