To solve the problems of shaving and reusing information in the information system, a rules-based ontology constructing approach from object-relational databases is proposed. A 3-tuple ontology constructing model is p...To solve the problems of shaving and reusing information in the information system, a rules-based ontology constructing approach from object-relational databases is proposed. A 3-tuple ontology constructing model is proposed first. Then, four types of ontology constructing rules including class, property, property characteristics, and property restrictions ave formalized according to the model. Experiment results described in Web ontology language prove that our proposed approach is feasible for applying in the semantic objects project of semantic computing laboratory in UC Irvine. Our approach reduces about twenty percent constructing time compared with the ontology construction from relational databases.展开更多
This paper compares the differences between the mathematical model in graph theory and GIS network analysis model.Thus it claims that the GIS network analysis model needs to solve.Then this paper introduces the spatia...This paper compares the differences between the mathematical model in graph theory and GIS network analysis model.Thus it claims that the GIS network analysis model needs to solve.Then this paper introduces the spatial data management methods in object-relation database for GIS and discusses its effects on the network analysis model.Finally it puts forward the GIS network analysis model based on the object-relation database.The structure of the model is introduced in detail and research is done to the internal and external memory data structure of the model.The results show that it performs well in practice.展开更多
As the latest version of relational database standard,SQL3 not only has been extended with many new relational features but also added with the object-oriented technologies.This paper introduces the object-oriented fe...As the latest version of relational database standard,SQL3 not only has been extended with many new relational features but also added with the object-oriented technologies.This paper introduces the object-oriented features of SQL3 and then extends it with object deputy model to support object view mechanisms.展开更多
基金supported by the National Natural Science Foundation of China (60471055)the National "863" High Technology Research and Development Program of China (2007AA01Z443)
文摘To solve the problems of shaving and reusing information in the information system, a rules-based ontology constructing approach from object-relational databases is proposed. A 3-tuple ontology constructing model is proposed first. Then, four types of ontology constructing rules including class, property, property characteristics, and property restrictions ave formalized according to the model. Experiment results described in Web ontology language prove that our proposed approach is feasible for applying in the semantic objects project of semantic computing laboratory in UC Irvine. Our approach reduces about twenty percent constructing time compared with the ontology construction from relational databases.
基金Funded by the National 973 Project(NO.G2000077904)the National 863 Project(No.2002AA131030).
文摘This paper compares the differences between the mathematical model in graph theory and GIS network analysis model.Thus it claims that the GIS network analysis model needs to solve.Then this paper introduces the spatial data management methods in object-relation database for GIS and discusses its effects on the network analysis model.Finally it puts forward the GIS network analysis model based on the object-relation database.The structure of the model is introduced in detail and research is done to the internal and external memory data structure of the model.The results show that it performs well in practice.
基金Supported by the National Natural Science Foun-dation of China(60273072)S63 Foundation of China(2002AA4Z3150)+1 种基金Research Fund for the Doctoral Prugram of High-er Education(20010486029)Hubei Natural Science Fund for Dy tinguished Youth(2002AC003)
文摘As the latest version of relational database standard,SQL3 not only has been extended with many new relational features but also added with the object-oriented technologies.This paper introduces the object-oriented features of SQL3 and then extends it with object deputy model to support object view mechanisms.
