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There is coexistence of different metadata standards in the field of Earth Science. It causes many challenging difficulties of data Sharing and Management in Earth Science. In order to deal with the problem, a multi-standard compatible metadata framework named "XMCMF" is proposed by extending the tree model and introducing object types, inheritance mechanisms and alias mechanisms. XMCMF...
Maintaining desired data availability while minimizing costs is the primary challenge in designing P2P storages. Data placement schemes and data availability calculation methods are two key design choices. Prior work has used the random placement and steady-state availability analysis model widely. We find this approach has two drawbacks: (1) it ignores the time-related property and greatly underestimates...
Data availability evaluation is the crucial problem to build large-scale, high available peer-to-peer storage systems by governing many unreliable hosts. However, many recent studies equate host availability with data availability and calculate data availability based on the traditional definition of host availability. By analyzing the trace of live P2P system, we argue that there is a significant...
Currently most centralized RDF storage and query architectures have problems in query performance and scalability. In this paper we present a distributed RDF query architecture to address these problems, which is built on Chord and Sesame. In our architecture, we construct semantic topology with distributed interest- index to route query and take advantage of semantic similarity between query and...
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