Alisson Andrade

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eScience is rapidly changing the way we do research. As a result, many research labs now need non-trivial computational power. Grid and voluntary computing are well-established solutions for this need. However, not all labs can effectively benefit from these technologies. In particular, small and medium research labs (which are the majority of the labs in(More)
We here present and evaluate an autonomous accounting scheme that provides accurate results even when the parties (consumer and provider) do not trust each other. Our accounting scheme relies on the observed relative performance among the parties. It is totally autonomous in the sense that it uses only local information, i.e. there is no exchange of(More)
We here present and evaluate relative accounting, an autonomous accounting scheme that provides accurate results even when the parties (consumer and provider) do not trust each other. Relative accounting relies on the observed relative performance among the parties. As such, the basic requirement to use it is that resource consumers must also be resource(More)
Large scale grid systems may provide multitudinous services, from different providers, whose quality of service will vary. Moreover, services appear (and disappear) in the grid with no central coordination. Thus, to find out the most suitable service to fulfill their needs, grid users must resort to Grid Information Services (GISs). These services allow(More)
High performance platforms composed of commodity computing resources, such as grids and peer-to-peer systems, have greatly evolved and assumed an important role in the last decade. Nevertheless, their wide commercial use still depends on the establishment of an effective quality of service (QoS) infrastructure in those environments. For this reason, a(More)
BACKGROUND The investigation of ischemic stroke etiology is commonly limited to the heart and extracranial vessels. Nevertheless, the diagnosis of intracranial stenosis may carry important therapeutic implications. The aims of this study were to determine the prevalence and clinical predictors of intracranial atherosclerotic stenosis (ICAS) in a sample of(More)
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