Data Management in Grid and Peer-to-Peer Systems: 4th by Julio Araujo, Frédéric Giroire, Julian Monteiro (auth.),

By Julio Araujo, Frédéric Giroire, Julian Monteiro (auth.), Abdelkader Hameurlain, A Min Tjoa (eds.)

This publication constitutes the refereed lawsuits of the 4th overseas convention on facts administration in Grid and Peer-to-Peer platforms, Globe 2011, held in Toulouse, France, in September 2011 together with DEXA 2011. The 12 revised complete papers awarded have been rigorously reviewed and chosen from 18 submissions. The papers are equipped in topical sections on info garage and replication, semantics for P2P platforms and function review, source discovery and routing in cellular P2P networks, and knowledge circulate structures and large-scale allotted applications.

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Additional resources for Data Management in Grid and Peer-to-Peer Systems: 4th International Conference, Globe 2011, Toulouse, France, September 1-2, 2011, Proceedings

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Figure 6 plots this trade-off (log-scale on y axis of overhead curve). As k increases, the number of false positives on nodes decreases, which triggers less connection creations for the same result of keeping the network connected. At the opposite, the number of consumed messages increases fast; this overhead is then largely dominated by the k-hop neighborhood exploration around nodes. In such a scenario, a basic technique recreating a new connection to another random node each time one of its neighbor has failed is creating 7474 edges, which is substancially higher than with our method.

A history of received queries is made of two lists L1 and L2 . List L1 contains the entities used in the last k received queries, while L2 contains the ontologies used to express the last k received queries. Notice that an item can appear several time in a list if it has been involved in several queries. The intuition of the scoring function is that peers favour the correspondences that might be useful for translating queries (it can be useful locally, or for others). Definition 6 (Scoring function).

Cerqueus, S. Cazalens, and P. Lamarre does not belong to Nr (p). We first propose a measure that focuses on a given peer and determines how this latter is understood by its neighbours: 1 r (M, p) = d(p, pi ) HDap |Nr (p)| pi ∈Nr (p) A global measure can be obtained: r (M) = HDapAvg 1 |P| r HDap (M, p) p∈P If HDapAvg ’s value is weak, it means that peers are globally close to their neighbours: each peer is surrounded by peers able to “understand” it. Proposition 1. All the measures introduced in this section satisfy both properties of minimality and maximality (proof is trivial).

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