Principles of database and knowledge-base systems, Vol. I
Principles of database and knowledge-base systems, Vol. I
A probabilistic relational model and algebra
ACM Transactions on Database Systems (TODS)
A probabilistic relational algebra for the integration of information retrieval and database systems
ACM Transactions on Information Systems (TOIS)
A formula for incorporating weights into scoring rules
Theoretical Computer Science - Special issue on the 6th International Conference on Database Theory—ICDT '97
Principles and Applications
Modern Information Retrieval
FQAS '98 Proceedings of the Third International Conference on Flexible Query Answering Systems
Non-commutativity and Expressive Deductive Logic Databases
JELIA '02 Proceedings of the European Conference on Logics in Artificial Intelligence
Learning Different User Profile Annotated Rules for Fuzzy Preference Top-k Querying
SUM '07 Proceedings of the 1st international conference on Scalable Uncertainty Management
On Fuzzy vs. Metric Similarity Search in Complex Databases
FQAS '09 Proceedings of the 8th International Conference on Flexible Query Answering Systems
A Data Model for Fuzzy Linguistic Databases with Flexible Querying
AI '09 Proceedings of the 22nd Australasian Joint Conference on Advances in Artificial Intelligence
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The paper is dealing with the problem of flexible querying using vague linguistic expressions and user dependent requirements. We propose a solution based on incorporating weights into scoring rules by the usage of fuzzy logic and fuzzy similarities. We define a data model, which enables to answer queries over crisp data using fuzzy knowledge base, fuzzy interpretation of vague expressions and fuzzy similarities. We present an extension of a positive relational algebra and show that its the expressive power together with a fuzzy fixpoint operator is sufficient for evaluating fuzzy Datalog programs. We discuss also a computational model for queries with a threshold on truth values and optimization of such queries.