The convergence of Multigrid methods can be analyzed based on a Fourier analysis of the method or by proving certain inequalities that have to be fulfilled by the smoother and by the coarse grid correction separately. Here, we analyze the Multigrid method for the constant coefficient Poisson equation with a compact Fourier analysis using the formalism of multilevel Toeplitz matrices and their g...

the purpose of the this study was to investigate the effect of direct current on montoneuron reflex exitability. thirty six subjects (18 males, 18 females) 19.36 years of age ( x= 24.06, sd= 3.63) participated in this study. the reflex excitability of soleus motoneruons was assessed by measuring the amount of change in the peak to peak ampitude of the h-reflex before and after direct current wa...

Recent evidence provided by Diebold, Gardeazabal, and Yilmaz (1994) for the post-1973 floating rate period points toward the predictive superiority of a martingale representation of exchange rate evolution over that of an error correction model that assumes rates are cointegrated. This is an appealing result from the perspective of efficient assimilation of randomly arriving information. As a d...

A method for retrospective correction of intensity inhomogeneities induced by the heel effect in digital radiographs is presented. The method is based on a theoretical model for the heel effect which is derived from the acquisition geometry. Because the heel effect is directly measurable in the direct exposure area only, the image is partitioned first to exclude collimation and diagnostic areas...

The uncommon conditions in leprosy requiring surgical correction are either the direct result of the disease or secondary to nerve paralysis. They usually occur in the later stages of leprosy and are uncommon today, thanks to early treatment of leprosy by multidrug therapy (MDT). However, in areas where treatment has only started recently, there is a backlog of such deformities needing correcti...

The transient flow analyzing by the frequency domain method (FDM) is computationally much faster than the method of characteristic (MOC) in the time domain. FDM needs no discretization in time and space, but requires the linearization of governing equations and boundary conditions. Hence, the FDM is only valid for small perturbations in which the system’s hydraulics is almost linear. In this st...