Currently, schema integration frameworks use approaches like rule-based, machine learning, etc. This paper presents an ontology-based wrapper-mediator framework that uses both the rule-based and machine learning strat...Currently, schema integration frameworks use approaches like rule-based, machine learning, etc. This paper presents an ontology-based wrapper-mediator framework that uses both the rule-based and machine learning strategies at the same time. The proposed framework uses global and local ontologies for resolving syntactic and semantic heterogeneity, and XML for interoperability. The concepts in the candidate schemas are merged on the basis of the similarity coefficient, which is calculated using the defined rules and the prior mappings stored in the case-base.展开更多
The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calle...The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calledHBase. This paper discusses its temporal structure, temporal syntax and semanics,as well as the special techniques used in the Anplementation of HBase.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.69983010 60233010 (国家自然科学基金)+1 种基金 the National High-Tech Research and Development Plan of China under Grant No.2001AA113130 (国家高技术研究发展计划) the National Gr
文摘Currently, schema integration frameworks use approaches like rule-based, machine learning, etc. This paper presents an ontology-based wrapper-mediator framework that uses both the rule-based and machine learning strategies at the same time. The proposed framework uses global and local ontologies for resolving syntactic and semantic heterogeneity, and XML for interoperability. The concepts in the candidate schemas are merged on the basis of the similarity coefficient, which is calculated using the defined rules and the prior mappings stored in the case-base.
文摘The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calledHBase. This paper discusses its temporal structure, temporal syntax and semanics,as well as the special techniques used in the Anplementation of HBase.
