AIME 87 pp 112-119 | Cite as

A Representation of Time for Medical Expert Systems

  • Ian Hamlet
  • Jim Hunter
Part of the Lecture Notes in Medical Informatics book series (LNMED, volume 33)


Despite the fact that reasoning over time is clearly of great importance in diagnosis, prognosis and treatment planning, few medical expert systems have attempted to represent this facet of medical knowledge. This paper describes how a “time specialist” is being developed to handle the temporal aspects of problem-solving, and in particular, how it might deal with uncertainty and ambiguity in temporal relationships by using a form of Truth Maintenance.


expert systems temporal reasoning truth maintenance 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    W.J. Long, “Reasoning about State from Causation and Time in a Medical Domain,” AAAI-83, pp. 251–254, 1983.Google Scholar
  2. 2.
    L.M. Fagan, “VM: Representing Time-Dependent Relations in a Medical Setting,” PhD Thesis, Stanford University, Dept. of Computer Science. 1980.Google Scholar
  3. 3.
    R.K. Sinnhuber and J.R.W. Hunter, “Temporal Information for Medical Expert Systems: A Review of Recent Work,” Report AIMG-6, Artificial Intelligence in Medicine Group. University of Sussex. 1984.Google Scholar
  4. 4.
    J.R.W. Hunter. “Artificial Intelligence in Medicine: A Tutorial Survey — Part 2: Comparisons,” Biomedical Measurement, Informatics and Control, 1987.Google Scholar
  5. 5.
    J.F. Allen, “An Interval-Based Representation of Temporal Knowledge.” IJCAIS1, 1981.Google Scholar
  6. 6.
    J.F. Allen. “Maintaining Knowledge about Temporal Intervals.” Communications of the ACM. vol. 26. no. 11. 1983.Google Scholar
  7. 7.
    J.F. Allen and H.A. Kautz. “A Model of Naive Temporal Reasoning.” in Formal Theories of the Commonsense World, ed. J.R. Hobbs and P.C. Moore, pp. 251–268. Ablex. Norwood. New Jersey. 1985.Google Scholar
  8. 8.
    J.F. Allen and J.A. Koomen. “Planning Using a Temporal World Model.” IJCAIS3. pp. 741–747. 1983.Google Scholar
  9. 9.
    J. De Kleer. “An Assumption-Based TMS.” Artificial Intelligence, vol. 28. no. 2. pp. 127–162. 1986.CrossRefGoogle Scholar
  10. 10.
    K.M. Kahn. “Mechanisation of Temporal Knowledge.” M.Sc. Thesis. MIT/LCS/TR-155, 1975.Google Scholar
  11. 11.
    K.M. Kahn and G.A. Gorry. “Mechanising Temporal Knowledge.” Artificial Intelligence, vol. 9. pp. 87–108. 1977.CrossRefGoogle Scholar
  12. 12.
    M. Vilain and H. Kautz. “Constraint Propagation Algorithms for Temporal Reasoning,” AAAI-86, vol. 1. pp. 377–382. 1986.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • Ian Hamlet
    • 1
  • Jim Hunter
    • 1
  1. 1.Artificial Intelligence in Medicine Group School of Engineering and Applied SciencesUniversity of SussexBrightonUK

Personalised recommendations