Paulo Ditarso Maciel

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With the emergence of the cloud computing paradigm and the continuous search to reduce the cost of running Information Technology (IT) infrastructures, we are currently experiencing an important change in the way these infrastructures are assembled, configured and managed. In this research we consider the problem of managing a computing infrastructure whose(More)
With the emergence of utility computing and the continuous search for reducing the cost of running information technology (IT) infrastructures, we will soon experience an important change on the way these infrastructures are assembled, configured and managed. In this paper we consider the problem of managing a hybrid high-performance computing(More)
— The Broadband Wireless Access (BWA) technology has been proposed to support different traffic classes with distinct quality of service (QoS) requirements in broadband metropolitan area networks. Therefore, as part of its specifications, such a system must properly address the combined requirements of wireless communications and multimedia applications. We(More)
Peer-to-peer (P2P) desktop grids have been proposed as an economical way to increase the processing capabilities of information technology (IT) infrastructures. In a P2P grid, a peer donates its idle resources to the other peers in the system, and, in exchange, can use the idle resources of other peers when its processing demand surpasses its local(More)
Abstract: Co-design methodologies have arisen for supporting the development of digital systems composed of mixed hardware/software. Partitioning is performed by co-design tools for splitting the functionality of the original system among components. In this paper, a partitioning approach based on a Petri net intermediate format is proposed. The new model(More)
We consider the problem of managing a hybrid computing infrastructure whose processing elements are comprised of in-house dedicated machines, virtual machines acquired on-demand from a cloud computing provider through short-term reservation contracts, and virtual machines made available by the remote peers of a best-effort peer-to-peer (P2P) grid. Each of(More)
The need for reliability and availability has increased in modern applications, in order to handle rapidly growing demands while providing uninterrupted service. Cloud computing systems fundamentally provide access to large pools of data and computational resources through a variety of interfaces, similarly to existing grid and HPC resource management and(More)
—The RESTART method is an efficient algorithm to estimate low probabilities by simulation. It forces a rare event to be visited more frequently by splitting promising paths at certain thresholds. The achievable speedup depends heavily on the quality of the importance function, which controls the splitting behavior. It is well-known from the literature that(More)