In a structured peer-to-peer (p2p) network, Distributed Hash Tables (DHT) are maintained by nodes to store information and to route the packets. But sometimes a node can be attacked and so it may deny the DHT key access or misroute the packets. Replica Placement is a key mechanism to overcome these problems by placing replica for nodes in p2p network. MAXDISJOINT replica placement strategy crea...

We propose CLEAR (Context and Location-based Efficient Allocation of Replicas), a dynamic replica allocation scheme for improving data availability in mobile ad-hoc peer-to-peer (M-P2P) networks. CLEAR exploits user mobility patterns and deploys a super-peer architecture to manage replica allocation efficiently. CLEAR avoids broadcast storm during replica allocation and eliminates the need for ...

in this paper by combining caching and replication techniques proposed a hybrid heuristic method based on the greedy algorithm to use the benefit of each other techniques. the algorithm in each interaction compares all the contents and one that made the best benefit value is selected for replication. the hybrid approach tested in a simulation environment and the results show that hybrid algorit...

This Chapter outlines the replica approach in Random Matrix Theory. Both fermionic and bosonic versions of the replica limit are introduced and its trickery is discussed. A brief overview of early heuristic treatments of zero-dimensional replica field theories is given to advocate an exact approach to replicas. The latter is presented in two elaborations: by viewing the β = 2 replica partition ...

The minimum vertex-cover problems on random α-uniform hypergraphs are studied using two different approaches, a replica method in statistical mechanics of random systems and a leaf removal algorithm. It is found that there exists a phase transition at the critical average degree e/(α-1), below which a replica symmetric ansatz in the replica method holds and the algorithm estimates exactly the s...

Data replica placement is an important issue in the cloud storage system, which includes two key points: how to determine the replica factor and how to select optimal Datanode to store replica. With the provision of file store service and file access service for large scale users, the Datanode in cloud storage system is regarded as services site. According to the basic principle of queuing theo...