A logical design methodology for relational databases using the extended entity-relationship model
ACM Computing Surveys (CSUR)
IFO: a formal semantic database model
ACM Transactions on Database Systems (TODS)
Fuzzy functional dependencies and lossless join decomposition of fuzzy relational database systems
ACM Transactions on Database Systems (TODS)
Proximity relations in the fuzzy relational database model
Fuzzy Sets and Systems
On nearness measures in fuzzy relational data models
International Journal of Approximate Reasoning
Imprecision and uncertainty in the UFO database model
Journal of the American Society for Information Science - Special issue: management of imprecision and uncertainty
The Unified Modeling Language user guide
The Unified Modeling Language user guide
Fuzzy sets as a basis for a theory of possibility
Fuzzy Sets and Systems
The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Assessment of data redundancy in fuzzy relational databases based on semantic inclusion degree
Information Processing Letters
An extended database design methodology for uncertain data management
Information Sciences—Informatics and Computer Science: An International Journal
Entity-Relationship Modeling and Fuzzy Databases
Proceedings of the Second International Conference on Data Engineering
Extending UML for Object-Relational Database Design
«UML» '01 Proceedings of the 4th International Conference on The Unified Modeling Language, Modeling Languages, Concepts, and Tools
Extending object-oriented databases for fuzzy information modeling
Information Systems - Databases: Creation, management and utilization
Management of probabilistic data: foundations and challenges
Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Fuzzy XML data modeling with the UML and relational data models
Data & Knowledge Engineering
XML conceptual modeling using UML
ER'00 Proceedings of the 19th international conference on Conceptual modeling
Uncertainty management issues in the object-oriented data model
IEEE Transactions on Fuzzy Systems
Handling complex and uncertain information in the ExIFO and NF2 data models
IEEE Transactions on Fuzzy Systems
Relaxing constraints in enhanced entity-relationship models using fuzzy quantifiers
IEEE Transactions on Fuzzy Systems
Formal translation from fuzzy EER model to fuzzy XML model
Expert Systems with Applications: An International Journal
Integrated Computer-Aided Engineering
Conceptual design of object-oriented databases for fuzzy engineering information modeling
Integrated Computer-Aided Engineering
Extending engineering data model for web-based fuzzy information modeling
Integrated Computer-Aided Engineering
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Computer applications in non-traditional area have put requirement on conceptual data modeling. Some conceptual data models, being the tool of design databases, have been proposed. On one hand, the Unified Modeling Language (UML) can be applied for many areas of software and knowledge engineering, and is being applied to data modeling. On the other hand, information in real world application is often vague or ambiguous. Currently, less research has been done in modeling imprecision and uncertainty in conceptual data model and design of databases with imprecision and uncertainty. In this paper, based on fuzzy set and possibility distribution theory, different levels of fuzziness are introduced into the UML class diagram model and the corresponding formal representations are given. The UML class diagram model is then extended to fuzzy UML data model. The formal mapping of the fuzzy UML data model into the fuzzy relational database schema is proposed in the paper.