• Conference Object  

      Bispectral analysis of surface EMG 

      Kaplanis, P. A.; Pattichis, Constantinos S.; Hadjileontiadis, L. J.; Panas, S. M. (IEEE, 2000)
      The objective of this ongoing study is to investigate whether or not Bispectral analysis (BS), a particular form of higher order spectra (HOS), may be utilized for analyzing the surface electromyographic signal (SEMG). The ...
    • Conference Object  

      Classification performance of motor unit action potential features 

      Pattichis, Constantinos S.; Elia, Avraam; Schizas, Christos N.; Middleton, Lefkos T. (IEEE, 1994)
      The objective of this study is to examine the classification performance of the following motor unit action potential (MUAP) feature sets: i) time domain measures, ii) frequency measures, iii) autoregressive coefficients ...
    • Article  

      Frequency domain and dynamic game methods for actuator/sensor selection in systems with sector nonlinearities 

      Demetriou, M. A.; Charalambous, Charalambos D. (2001)
      The purpose of this note is to provide a method for placing actuators and sensors in systems with nonlinear dynamics wherein the choices for actuator and sensor locations are such that the resulting system is rendered ...
    • Conference Object  

      Frequency-domain characterization of Singular Spectrum Analysis eigenvectors 

      Leles, M. C. R.; Cardoso, A. S. V.; Moreira, M. G.; Guimaraes, H. N.; Silva, C. M.; Pitsillides, Andreas (Institute of Electrical and Electronics Engineers Inc., 2017)
      Singular Spectrum Analysis (SSA) is a nonparametric approach used to decompose a time series into meaningful components, related to trends, oscillations and noise. SSA can be seen as a spectral decomposition, where each ...
    • Conference Object  

      Influence of isometric voluntary contraction on time and frequency domain parameters of surface EMG 

      Kaplanis, P. A.; Pattichis, Constantinos S.; Roberts, C. V. (2002)
      The main objective of this paper was to investigate the effect of increase of isometric voluntary contraction (IVC) on surface EMG recorded from the Biceps Brachii (BB) muscle. Five different force levels (FL) were used: ...
    • Conference Object  

      Model-based broken rotor bar detection on an IFOC driven squirrel cage induction motor 

      Rodríguez-Cortés, H.; Hadjicostis, Christoforos N.; Stankovic, A. M. (2004)
      In this paper, we propose an on-line monitoring scheme to detect broken rotor bars on IFOC driven squirrel cage induction motors. The drive's variable speed nature complicates the use of classical spectrum analysis techniques. ...
    • Article  

      A modular neural network decision support system in EMG diagnosis 

      Christodoulou, Christodoulos I.; Pattichis, Constantinos S.; Fincham, W. F. (1998)
      Motor unit action potentials (MUAPs) recorded during routine electromyographic (EMG) examination provide important information for the assessment of neuromuscular disorders. The objective of this study was to design, ...
    • Article  

      On efficient AR spectral estimation for long-range predictions 

      Karagrigoriou, Alex; Vonta, Filia (2005)
      This article discusses the concept of asymptotic efficiency from the frequency domain point of view making use of the direct method for multiple prediction. In particular, it is shown that with the use of a new autoregressive ...
    • Article  

      Random spectral measure for non Gaussian moving averages 

      Baxevani, Anastassia; Podgórski, K. (2017)
      We study the distribution of phases and amplitudes for the spectral representation of weighted moving averages of a general noise measure. The simple independent structure, known for the Gaussian case, and involving Rayleigh ...
    • Article  

      A spectral domain decomposition approach for steady Navier-Stokes problems in circular geometries 

      Karageorghis, Andreas; Tang, T. (1996)
      In this study, a spectral collocation domain decomposition method is developed for the numerical solution of second and fourth-order problems in circular domains. The method is applied to the Navier-Stokes equations and ...