Study On Otology-Based Grid Metadata And Related Technology

The development and application of Grid have put forword new requirements on resource management continuously.The goal of Grid resource management is integrating all kinds of autonomic resources and applications,and managing them unitedly to provide expandable,security,unanimous,pervasive,high efficency and wide scope resource sharing and computing service.So that Grid resource management has become one of the core problems in Grid research area.But the dynamic and heterogenous characteristics of Grid resources bring high challenge on resource discovery and allocation.It requires the resource management mode to be more intelligent,and adapt the requiremtn of resource dynamicly changing,heterogenouse, large scale and scope.The difference of Grid resouces,applications and regions also make the resource description mentadatas heterogeneity.This may bring a lot of influence on Grid resource discovery and interoperability.This paper described the related technology completedly,summarized the researching status and development tendency briefly,and indicated the deficiency of the current works.Combining the newliest production of related researching area and aiming at the lack of them,we promoted an ontology-based Grid resource metadata semantic model,investigated the metadata extracting and semanticnizing algorithm and Grid resource registry and management technology.We explored the resource semantic matching arithmetic and discovery system framework.Also,we applied the researching results in Government Grid to solve the problem of resource sharing and business cooperating problems in e-Government area.First,this paper made abstract analysis on Grid resources and made modeling analysis on metadata.It put forward abstract model of Grid resource and metadata.So we designed metadata ontology using ontology modeling technology,and realized the semantic Grid resource metadata,which is computer readingable,combining domain ontologies.This provided basis for semantic resource discovery.Next,this paper discussed the Grid resource management technology.It provided Grid resource metadata scheme and do some systemic research on metadata extraction, metadata semanticnizing transaction,metadata registry and metadata cooperation. Combining ontology and semantic annotation,we designed the Grid metadata semantic transaction arithmetic,so that the semantics of metadata can be expressed by concepts of ontology exactly and realized the semantic metadata collection and management.Then,the construction of semantic metadata in Grid establish basis for Grid resource discovery.But we need study the semantic matching policy and discovery arithmetic to realize the semantic resource discovery and management.The paper had studied the semantic relativity and semantic distance between concepts in ontology,and designed the semantic similarity algorithm between concepts.By the research of semantic similarity and semantic discriminating between concepts,we brought forward the Grid resource similarity algorithm based-on semantics.Laying the foundation of the research,we realized the semantic matching among Grid resources and customer' s requirements,moreover we have discussed the expansion of aligrithm.Moreover,we discribed the discovery mechanism,discovery mode,discovery service' s key element and discovery operation of Grid resources.So we put forward a Grid resource discovery model based on metadata and ontology.We have researched the muliti-ontologies collaboration technology and designed Grid resource discovery system framework.Furthermore,we have discussed the expansion of the framework by combining personal resouce agent.Finally,we combined the requirement of resource sharing and business collaboration,and put forward the Government Grid,which realized the hardware and software sharing among government departments by Grid technology.According to the Shanghai e-Government construction condition,we built a testing environment of Government Grid among a few departments.In the validation of our research,we designed the Government Grid resource metadata ontology and e-Government ontology, and developed metadata editor,registry and catalog service systems.Moreover,we programmed the ontology-based metadata semantic transaction and transform system. We realized the Grid resource catalog service and semantic discovery.At the same time, we partly applied the resource dispatching and exchanging.The paper made sytemic researched on Grid resource metadata model and ontology-based semantic Grid resource discovery.Separately,we built the Grid resource abstract model,metadata abstract model,metadata ontology model and semantic metadata model.We studied the semantic metadata management technology in Grid, designed Grid resource metadata shceme,metadata extraction and semantic transaction algorithm,and done research on metadata registry and interoperability.Also we developed Grid resource matching and discovery algorithm based on metadata and ontology and realized the resource matching and discovery by semantic similarity.We researched the Grid resource discovery model and designed the semantic resource discovery sytem framework.Lastly,we using the researching results in e-Government construction,designed the Government Grid System,built a validitory environment,and do applying experiment of metadata management,resource cataloging,discovery and alloction.Further more,some of the research achievements have been used in the practice projects.