C. F. Borges

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We introduce a method for constructing an element-by-element sparse approximate inverse (SAI) preconditioner designed to be effective in a massively-parallel spectral element modeling environment involving non-symmetric systems. This new preconditioning approach is based on a spectral optimization of a low-resolution pre-conditioned system matrix (PSM). We(More)
In this work, it is described some of the results of an ongoing research focused on developing communicative practice in foreign languages, using networked virtual environments, which can be explored cooperatively over the Internet. A courseware, the Tour Guide Virtual Course, was specially designed to use virtual reality environments that represent the(More)
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