Abstract
In this paper we examine the problem of representing different types of incomplete data in an information system. Clausal form logic is used as a representation language and we look at the consequences of the subsequent increase in expressive power. We propose a method of improving the system’s response to a query by giving an uncertainty measure based on entropy.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Codd, E.F. Understanding relations. ACM SIGMOD 7, (1975), 23–28.
Codd, E.F. Extending the database relational model to capture more meaning. ACM TODS 4,4 (Dec. 1979), 394–434.
Codd, E.F. Missing information (applicable and inapplicable) in relational systems. SIGMOD Record 15, 4 (Dec. 1986).
Date, C.J. Null values in databases. Proceedings of the 2nd British National Conference on Databases, (1982).
Gray, M. Views and imprecise information in databases. Ph.D Thesis, Cambridge, England, (Nov. 1982).
Morrissey, J.M. A treatment of imprecise data and uncertainty in information systems. Ph.D. Thesis, National University of Ireland, (Aug.1987)
Lipski, W. On semantic issues connected with incomplete information databases. ACM TODS 4,3 (Sept. 1979) 262–296.
Moore, R. Reasoning about Knowledge and Action. Technical Note191. SRI International, Menlo Park, CA. 1980.
Ullman, J. Universal relation interfaces for database systems. In: Information Processing ‘83. Mason, R.E.A., Ed. Elsevier Science Publishers, B.V.(North Holland) (1983).
Vassiliou, Y. Null values in database management: a denotational semantics approach. Proceedings of the 1979 ACM SIGMOD international conference on management of data. Boston, (1979).
Vassiliou, Y. A formal treatment of imperfect information in database management. Ph.D. Thesis. University of Toronto, (Sept. 1980).
Williams, M.H.; Nicholson, K.A. An approach to handling incomplete information in databases. Computer Journal, 31 (2), (1988), 133–140.
Winslett, M. A model based approach to updating databases with incomplete information. Database Systems 13 (2), (1988), 167–196.
Zloof, M.M. Query-By-Example: a database language. IBM Systems Journal, 16, (1977), 324–343.
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1991 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Morrissey, J.M. (1991). Incomplete Information and Uncertainty. In: McTear, M.F., Creaney, N. (eds) AI and Cognitive Science ’90. Workshops in Computing. Springer, London. https://doi.org/10.1007/978-1-4471-3542-5_22
Download citation
DOI: https://doi.org/10.1007/978-1-4471-3542-5_22
Publisher Name: Springer, London
Print ISBN: 978-3-540-19653-2
Online ISBN: 978-1-4471-3542-5
eBook Packages: Springer Book Archive