This article presents considerations about viability on reutilize existing web based eLearning systems on Interactive Digital TV environment according to Digital TV standard adopted in Brazil. Considering the popularity of Moodle system in academic and corporative area, such system was chosen as a foundation for a survey into its properties to create a specification of an Application Programmin...

Prediction error filters (PEFs) can be used to interpolate seismic data, in the time domain (Claerbout, 1992) or in the frequency domain (Spitz, 1991). The theory for PEFs assumes stationarity, so typically the data are considered a little bit at a time in patches, and assumed to be locally stationary within a patch. An alternative is to use nonstationary filters, which effectively sets the pat...

In this manuscript, we will study \({\tilde{o}}\)-convergence in (partially) ordered vector spaces and a kind of convergence space V. A V is called semi-order (in short space), if there exist an W operator T from into W. way, say that with respect to \(\{W, T\}\). net \(\{x_\alpha \}\subseteq V\) said be \({\{W,T\}}\)-order convergent \(x\in write \(x_\alpha \xrightarrow {\{W, T\}}x\)), wheneve...

Convergence properties of the block Gauss-Seidel algorithm applied to ergodic Markov chains are discussed in this paper. This algorithm is one of the most prevalent methods for computing ergodic probability vectors of large-scale Markov chains. We will provide necessary and sufficient conditions for global geometric convergence of this algorithm. To apply this algorithm, the state space of a Ma...

In [Don05b] Donaldson gives three operators on a space of Hermitian metrics on a complex projective manifold: T, Tν , TK . Iterations of these operators converge to balanced metrics, and these themselves approximate constant scalar curvature metrics. In this paper we investigate the convergence properties of these iterations by examining the case of the Riemann sphere as well as higher dimensio...

The CEV model is given by the stochastic differential equation Xt = X0 + ∫ t 0 μXsds + ∫ t 0 σ(X + s ) dWs, 1 2 ≤ p < 1. It features a non-Lipschitz diffusion coefficient and gets absorbed at zero with a positive probability. We show the weak convergence of Euler-Maruyama approximations Xn t to the process Xt, 0 ≤ t ≤ T , in the Skorokhod metric, by giving a new approximation by continuous proc...

We propose a finite volume scheme to discretize the one-dimensional Vlasov–Poisson system. We prove that, if the initial data are positive, bounded, continuous, and have their first moment bounded, then the numerical approximation converges to the weak solution of the system for the weak topology of L. Moreover, if the initial data belong to BV , the convergence is strong in C(0, T ;L loc ). To...

Recently the present author has given some convergence theorems of general nature for Levin's nonlinear sequence transformations. In this work these theorems are extended and sharpened to cover the case of power series, both inside and on their circle of convergence. It is shown that one of the two limiting processes considered in the previous work can be used for analytic continuation and a re...

The frequency analysis problem is to determine the unknown frequencies of a trigonometric signal with a sample of size N . Recently there has been established a method for determining those frequencies by using the asymptotic behaviour of the zeros of certain Szeg o polynomials. The Szeg o polynomials in question are orthogonal on the unit circle with respect to an inner product de ned by a m...

A convergence result for a 'generalized Richardson extrapolation process is improved .upon considerably and additional results of interest are'proved. An application of practical importance is also given. T ec hn io n C om pu te r Sc ie nc e D ep ar tm en t T eh ni ca l R ep or t C S0 53 0 19 88