We study mediated P2P marketplaces in which payment for P2P service is done via a trusted intermediary but the intermediary cannot monitor the rendered service. The lack of direct monitoring provides opportunities for malicious peers to launch crippling “lying attacks” against the marketplace. In this paper we propose a suite of payment schemes that are specifically designed to thwart lying att...

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...

Database caching supports declarative query processing close to the application. Using a full-fledged DBMS as cache manager, it enables the evaluation of specific project-select-join queries in the cache. In this paper, we propose significant improvements and optimizations – as compared to the well-known DBCache approach – that make our caching concept truly adaptive. Furthermore, we describe a...

the ability to discover services in mobile ad hoc network (manet) is a major prerequisite. cluster basedcross layer intelligent service discovery for manet (cbisd) is cluster based architecture, caching ofsemantic details of services and intelligent forwarding using network layer mechanisms. the cluster basedarchitecture using semantic knowledge provides scalability and accuracy. also, the mini...

The ability to discover services in Mobile Ad hoc Network (MANET) is a major prerequisite. Cluster basedcross layer intelligent service discovery for MANET (CBISD) is cluster based architecture, caching ofsemantic details of services and intelligent forwarding using network layer mechanisms. The cluster basedarchitecture using semantic knowledge provides scalability and accuracy. Also, the mini...

Web caches are installed to reduce the receivers’ latency and save network bandwidth. These caches need to cooperate in order to improve their performance. A popular technique to make caches cooperate is by setting up a caching hierarchy. However, there are several problems associated with a caching hierarchy: i) every hierarchy level introduces additional delay, ii) redundant document copies a...