Alexandre Ceasar Tavares Vidal

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SUMMARY Scheduling parallel and distributed applications efficiently onto grid environments is a difficult task and a great variety of scheduling heuristics has been developed aiming to address this issue. A successful grid resource allocation depends, among other things, on the quality of the available information about software artifacts and grid(More)
Scheduling parallel and distributed applications efficiently onto grid environments is a difficult task and a great variety of scheduling heuristics have been developed aiming to address this issue. A successful grid resource allocation depends, among other things, on the quality of the available information about software artifacts and grid resources. In(More)
SPKI/SDSI is a flexible and extensible decentralized security model that provides authentication, confidentiality, and access control. However, SPKI/SDSI certification chains are not suitable for large scale, highly dynamic environments such as computational grids. This work extends the SPKI/SDSI model by including an opinion model based on subjective(More)
— The coordinated sharing of resources to address computational problems is a central issue in environments of Grid computing. Two important scenarios arise from this issue. First, as the amount of installed applications increases, the difficulty of finding an explicitly desired application for reuse also grows. Simultaneously, the possibilities of suitable(More)
1. The electrocytes from the electric organ of the Patagonian ray P. extenta are very unusual cells: semicircular in shape, multinucleated and highly polarized. They have an anterior, concave, innervated face, which exhibits positive histochemical reactions for acetylcholinesterase and for the nicotinic acetylcholine receptor. Multiple nerve-endings are(More)
With a view to establishing the location of proteins related to the nicotinic cholinergic receptor (AChR), immunocytochemical studies were carried out in the electric tissue of the South American ray Discopyge tschudii. The receptor protein was localized at the innervated, ventral region of the electrocyte in cryostat sections using Texas Red-labelled(More)
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