Principles of database and knowledge-base systems, Vol. I
Principles of database and knowledge-base systems, Vol. I
Fuzzy information and database systems
Fuzzy Sets and Systems - On fuzzy information and database systems
Mass assignments and fuzzy sets for fuzzy databases
Advances in the Dempster-Shafer theory of evidence
CYC: a large-scale investment in knowledge infrastructure
Communications of the ACM
WordNet: a lexical database for English
Communications of the ACM
CYC, WordNet, and EDR: critiques and responses
Communications of the ACM
Information Retrieval
Modern Information Retrieval
Introduction to Modern Information Retrieval
Introduction to Modern Information Retrieval
Extracting knowledge from fuzzy relational databases with description logic
Integrated Computer-Aided Engineering
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Any computerised information storage system contains assumptions about the form and content of stored information, and the nature of queries. Most obviously, retrieving data from a relational database assumes knowledge of tables and attribute domains. In semi-structured and unstructured data, assumptions may be less explicit but are still present. For example, using a TF-IDF index assumes that the user is aware of the "correct" keywords to be used in queries. One way around this is to implement an ontology, i.e. a "concept dictionary" indicating sets of query terms which are equivalent and containing a hierarchy of concepts e.g. plant is a supertype of tree, which in turn is a supertype of oak. Such a hierarchy can be used to generalise or specialise queries. Manually creating an ontology is a very labour-intensive process. In this paper we describe a system which automatically acquires a concept dictionary. The concept dictionary should be regarded as a property of the whole system, i.e. the data and the querying mechanism, not just the data. It makes term similarity explicit and can form the basis for personalisation, by automatically translating a user's terms into those understood by the system.