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The sensitivity of a PET scanner is a function of the solid angle of coverage from the scintillation material to the object being scanned and the stopping power of the scintillation material being used. PET scanners also operate with an energy window centered on the 511 keV annihilation photons, wide enough to account for the energy resolution of the scanner's scintillator. The energy window reduces...
This work addresses the leader election problem in distributed systems where processes can crash and recover. More precisely, it focuses on implementing the Omega failure detector class, which provides a leader election functionality, in the crash-recovery failure model. The concepts of quiescence and near-quiescence for an algorithm implementing Omega are defined. Depending on the use or not of stable...
Unreliable failure detectors provide information about process failures. A particular failure detector called Omega has been shown to be the weakest for solving consensus with a majority of correct processes. This work addresses the implementation of Omega in the crash-recovery failure model. Firstly, the definition of Omega is adapted to that model, assuming that processes do not use stable storage...
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