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Recently, there is an increasing interest in the problem of mapping relational databases to RDF and OWL. Some theoretical work has been done to deal with this problem. However, there is no system implemented to allow the users to extract ontologies from real databases and provide visualization of the extracted ontology together with the mapping between the ontology and the relational database. In...
Total Data Quality Management (TDQM) methodology claims that we should manage data as we manage products, but principles, guidelines, and techniques of Total Quality Management for physical products have limitations in TDQM practices because of the nature of data. Some concepts and models are proposed for resolving problems in TDQM practices. Firstly, history evolvement of product is discussed, and...
In distributed heterogeneous scenarios, querying data from various sources efficiently and concisely is always a key challenge. In this paper, we analyze the characteristics of hydrological data and study the data integration in grid environment. We propose a query processing procedure based on domain topics and grid infrastructure. Domain topics are defined according to domain query patterns, and...
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