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
We developed a parallel object relational DBMS named PORLES. It uses BSP model as its parallel computing model, and monoid calculus as its basis of data model. In this paper, we introduce its data model, parallel que...We developed a parallel object relational DBMS named PORLES. It uses BSP model as its parallel computing model, and monoid calculus as its basis of data model. In this paper, we introduce its data model, parallel query optimization, transaction processing system and parallel access method in detail.展开更多
With the development of electric power industry,the requirement of information sharing and application integration between each application system is salience.To realize the real "sharing information,data mainten...With the development of electric power industry,the requirement of information sharing and application integration between each application system is salience.To realize the real "sharing information,data maintenance uniform",and effectively eliminate "island of information",a standard,open information model of power system should be followed urgently by different systems,and a common data interface should be provided.The Common Information Model(CIM) proposed by standard of IEC-61970 solve the problem effectively.The characteristics of the CIM Model and relational database of power system are analyzed,a mapping method between CIM model based on standard of IEC61970 and relational database is proposed,and corresponding problems between object-oriented model and the relational model are solved flexiblely.展开更多
Object oriented database OODB is the third generation of databases. It was a natural result of limitations on relational database and increasing requirements of software, and business needs. This paper presents the me...Object oriented database OODB is the third generation of databases. It was a natural result of limitations on relational database and increasing requirements of software, and business needs. This paper presents the method to apply OODB on ISO 9001:2000 System. It focuses in analysis and design phase by using Unified Modeling Language UML, and how can represent this type of database. This paper provides comprehensive information about applying OODB on software.展开更多
为了能在监控软件中实时监控数据,系统采用物理内存作为实时数据库的主存储区,在内存中完成对数据的存储、管理和实时操作．使用SQL Server 2000数据库管理历史数据,给出了基于商用数据库组态软件实时数据库的结构.整个系统采用多线程...为了能在监控软件中实时监控数据,系统采用物理内存作为实时数据库的主存储区,在内存中完成对数据的存储、管理和实时操作．使用SQL Server 2000数据库管理历史数据,给出了基于商用数据库组态软件实时数据库的结构.整个系统采用多线程面向对象的编程方法,在查找方法上采用直接定位指针的搜索方法,解决了与Windows操作系统相融合的问题．测试结果表明该系统能达到监控实时性的要求．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.
文摘We developed a parallel object relational DBMS named PORLES. It uses BSP model as its parallel computing model, and monoid calculus as its basis of data model. In this paper, we introduce its data model, parallel query optimization, transaction processing system and parallel access method in detail.
文摘With the development of electric power industry,the requirement of information sharing and application integration between each application system is salience.To realize the real "sharing information,data maintenance uniform",and effectively eliminate "island of information",a standard,open information model of power system should be followed urgently by different systems,and a common data interface should be provided.The Common Information Model(CIM) proposed by standard of IEC-61970 solve the problem effectively.The characteristics of the CIM Model and relational database of power system are analyzed,a mapping method between CIM model based on standard of IEC61970 and relational database is proposed,and corresponding problems between object-oriented model and the relational model are solved flexiblely.
文摘Object oriented database OODB is the third generation of databases. It was a natural result of limitations on relational database and increasing requirements of software, and business needs. This paper presents the method to apply OODB on ISO 9001:2000 System. It focuses in analysis and design phase by using Unified Modeling Language UML, and how can represent this type of database. This paper provides comprehensive information about applying OODB on software.
文摘为了能在监控软件中实时监控数据,系统采用物理内存作为实时数据库的主存储区,在内存中完成对数据的存储、管理和实时操作．使用SQL Server 2000数据库管理历史数据,给出了基于商用数据库组态软件实时数据库的结构.整个系统采用多线程面向对象的编程方法,在查找方法上采用直接定位指针的搜索方法,解决了与Windows操作系统相融合的问题．测试结果表明该系统能达到监控实时性的要求．
