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Humans tend to interact, to share information and establish relationships and naturally form groups based on interests. This fact motivate research on models, abstractions and mechanisms in order to enable more transparent and flexible interactions between users and group based collaborations. We propose a model that deals with dynamic group membership and combines multiple forms of communication...
We describe a Java-based distributed group programming interface - JGroupSpace. Its distinctive characteristic is the combination of multiple forms of communication within the group, based on message-passing, asynchronous event notification and a shared tuple space, and their integration to ensure the consistency of the views observed by the group members. For the application developer these communication...
We discuss the parallelization and distribution of a workflow based application. We present experimental results and discuss lessons learned. The experimentation is based on a scientific application case study - sequential simulation applied to geostatistics. As a result we identify a list of issues not well supported in the most referenced scientific workflows tools and environments namely Kepler,...
Feedback control systems have a peculiar behavior that allows them to compensate for disturbances in the controlled application. This paper investigates whether this resilience also extends to disturbances originating from faults in the controller itself. The question of what kind of failure model is more effective in this type of system is addressed, with three different models being studied: arbitrary...
The Sete Voltas massif (Sao Francisco craton, Brazil) appears as a composite crustal segment built in at least three successive accretional events dated by Rb-Sr, 207 Pb/ 206 Pb monozircon and U-Pb SHRIMP methods. (a) At ca 3.4 Ga, generation and emplacement of magmatic precursors to the old grey gneisses. These are the oldest rocks so far recognized in South...
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