Browsing by Subject "Spectrum analysis"
Now showing items 120 of 37

Article
ARM A Models, Prewhitening, and Minimum Gross Entropy
(1993)The problem of spectral estimation on the basis of observations from a finite stretch of a stationary time series is considered, in connection with knowledge of a prior estimate of the spectral density. In general, the ...

Conference Object
Bispectral analysis of EMG at different levels of force
(Publ by IEEE, 1993)Bispectral analysis suggests that EMG is highly nonGaussian at force level (FL) = 10% of maximum voluntary contraction

Conference Object
Bispectral analysis of surface EMG
(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
Capacity of gaussian channels with noise uncertainty
(2004)In this paper the problem of defining, and computing the capacity of a communication channel when the statistic of an additive noise is not fully known, is addressed. The communication channel is specified as a continuous ...

Article
Chemical, acoustic and optical response profiling for analysing burning patterns
(2013)Improved data processing algorithms along with modelling techniques were employed in order to profile the responses and to assess the analytical capabilities of a system consisting of a mass spectrometer, a camera and a ...

Article
Complexvalued tapers
(2005)The spectral estimation method based on the average of short, tapered periodograms is reexamined. The bias of such estimators is typically O(1/b2), where b is the length of the short blocks. Much of the current researeh ...

Article
Conforming Chebyshev spectral methods for Poisson problems in rectangular domains
(1993)Four and sixelement conforming domain decomposition techniques are developed for Chebyshev spectral collocation methods for Poisson problems in rectangular domains. The applicability of the methods is demonstrated on ...

Article
Conforming spectral methods for Poisson problems in cuboidal domains
(1994)A Chebyshev collocation strategy is introduced for the subdivision of cuboids into cuboidal subdomains (elements). These elements are conforming, which means that the approximation to the solution is C0 continuous at all ...

Article
Direct methods for spectral approximations in nonconforming domain decompositions
(1998)The application of a conforming spectral collocation method to certain nonconforming domain decompositions leads to global matrices which have a particular block structure. We study the performance of various direct linear ...

Article
Distribution theory for the studentized mean for long, short, and negative memory time series
(2013)We consider the problem of estimating the variance of the partial sums of a stationary time series that has either long memory, short memory, negative/intermediate memory, or is the firstdifference of such a process. The ...

Conference Object
Frequencydomain characterization of Singular Spectrum Analysis eigenvectors
(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 ...

Article
Identification and reconstruction of a small leak zone in a pipe by a spectral element method
(2006)This paper deals with the identification of a zone permitting fluid to leak out of a drain. Using the analogy with crack identification by boundary measurements, we give uniqueness and stability results and we propose an ...

Article
Kinetic and mechanistic studies of the watergas shift reaction on Pt/TiO2 catalyst
(2009)A detailed kinetic and mechanistic study of the watergas shift (WGS) reaction on a 0.5 wt% Pt/TiO2 catalyst has been carried out. The dependence of kinetic reaction rate on the partial pressures of reactants (CO, H2O) and ...

Article
Multifeature Texture Analysis for the Classification of Clouds in Satellite Imagery
(2003)The aim of this work was to develop a system based on multifeature texture analysis and modular neural networks that will facilitate the automated interpretation of satellite cloud images. Such a system will provide a ...

Conference Object
New image processing models for opacity image analysis in chest radiographs
(Institute of Electrical and Electronics Engineers Inc., 2002)The aim of this research is to develop new image processing models that can be used to characterize single opacities and opacity density within preselected regions of interest (ROI). We derive our new image processing ...

Article
New light from hybrid inorganicorganic emitters
(2008)We present the highlights of a research programme on hybrid inorganicorganic light emitters. These devices combine recent developments in IIIV nitride technology (including UV emitting microarrays and specifically ...

Article
A nonoverlapping domain decomposition method for Legendre spectral collocation problems
(2007)We consider the Dirichlet boundary value problem for Poisson's equation in an Lshaped region or a rectangle with a crosspoint. In both cases, we approximate the Dirichlet problem using Legendre spectral collocation, that ...

Article
Nonparametric Maximum Entropy
(1993)The standard maximum entropy method of Burg and the resulting autoregressive model has been widely applied for spectrum estimation and prediction. A generalization of the maximum entropy formalism in a nonparametric setting ...

Article
The numerical solution of laminar flow in a reentrant tube geometry by a Chebyshev spectral element collocation method
(1992)A Chebyshev spectral element collocation method is used for the numerical solution of laminar flow in a reentrant tube geometry. The high accuracy of the method allows the study of the merging process of the vortices in ...

Article
On the Maximum Entropy Problem with Autocorrelations Specified on a Lattice
(1993)The maximum entropy process with autocorrelations specified on a finite lattice is identified to be a Gaussian autoregressive process with a special structure in its coefficients. The autoregressive coefficients can be ...