Emrah Çem

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For large scale distributed systems, designing energy efficient protocols and services has become as significant as considering conventional performance criteria like scalability, reliability, fault-tolerance and security. We consider frequent item set discovery problem in this context. Although it has attracted attention due to its extensive applicability(More)
—We consider buffer management in support of large-scale gossip-based peer-to-peer data dissemination protocols. Coupled with an efficient buffering mechanism, system-wide buffer usage can be optimized while providing reliability and scalability in such protocols. We propose a novel approach, Stepwise Fair-share Buffering, that provides uniform load(More)
This study addresses the problem of discovering frequent items in unstructured P2P networks. We propose a fully distributed Protocol for Frequent Item set Discovery (ProFID) where the result is produced at every peer. We also propose a practical rule for convergence of the algorithm. Finally, we evaluate the efficiency of our approach through an extensive(More)
• Power awareness of flat and hierarchical epidemics in P2P systems is addressed. • We developed energy cost model formulations for flat and hierarchical epidemics. • We proposed a dominating-set based and power-aware hierarchical epidemic approach. • Through large scale simulations on PeerSim, we compared the epidemic approaches. • We analyzed the effect(More)
—Studying structural and functional characteristics of large scale graphs (or networks) has been a challenging task due to the related computational overhead. Hence, most studies consult to sampling to gather necessary information to estimate various features of these big networks. On the other hand, using a best effort approach to graph sampling within the(More)
—Epidemic or gossip-based mechanisms are preferred in several distributed protocols for their ease of deployment, simplicity, robustness against failures, load-balancing and limited resource usage. In flat neighborhood epidemics, peers have similar responsibilities and all participate in gossiping via neighboring peers. We have proposed an energy cost model(More)
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