Information Technology Reference
In-Depth Information
(3) The
records whether the solution has been implemented
successfully and the situation after the solution's implementation. With
the results, CBR can provide the cases that once worked successfully while
providing proposed solutions; meanwhile, potential problems can be
avoided with the records of previous failures. When a sufficient
understanding of the problem is absent, CBR works better through the
result parts.
result
Case indexing is an important aspect in retrieving and recalling the useful
cases relevant to the new problem. Case indexing involves assigning indices
to cases with an aim to facilitate their retrievals. Given a new case, the system
can retrieve the relevant cases by their indices that characterize the cases in
the case base, if any.
The following are three principles for case indexing:
(1) The indices should be relevant to the concrete domain. The indices in the
database is general enough to divide the database averagely, thus the
retrieval in database can be faster. While in CBR systems, indices should
be predicative and concrete enough to simplify the access and retrieval of
relevant cases.
(2) The indices should be predicative and abstract enough to allow for
widening the future use of the case base.
(3) The indices should be concrete enough to be recognized in future. Too
abstract indices will efface the differences among the cases.
5.6 Case Retrieval
Case retrieval is the process of find the best match in the case base to the
current problem. The knowledge in CBR systems is a history of solved
problems in the past (i.e., cases), rather in the form of rules as that in other
experts systems. A case in the case base contains the description of the
problem and the situation when the case occurred. When a new case is added
to the base, indices on its primary characteristics are also constructed. When a
new problem is encountered, the system utilizes the knowledge of similarities
and indices to retrieve the most similar cases to the current problem or
situation. This retrieval process plays an important role in CBR in that the
