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base cases and the target one.
(9) Case Retainion: Once the solution to the new problem has been generated, it
may be useful in the future problems of the situation similar to it. It is
necessary to add it into the current case base. The retainion of
newly-generated solution is also a process of knowledge acquisition, or in
other words, LEARNING. Case retainion involves the choice of information
that should be kept, the way to integrate the new case to the case base
organically, and the work to revise and refine the base cases, such as
generalization and abstraction.
The determination on what should be kept involves the following
several considerations generally: description of the features involved, the
result of the current problem solving, and the explanations on success or
failure.
Additional indices should be assigned to the newly-added cases to
facilitate their retrieval. Indices should be constructed in such a way that
the cases only be retrieved in the related cases. For this reason,
adjustments on the index contents, even the structure of case base should
be done, such as changes on the intensity of the indices or the weights of
feature concerned.
5.4 Case Representation
The brain's memory mechanism for knowledge is still an open problem now.
A great range of knowledge representation methods, such as production rules,
semantic network, frame, object-oriented representation, have been employed
in the present knowledge-based system, but it seems that they are unsuitable
in learning systems, especially in the analogically learning system. The reason
is that the knowledge in memory should be not only structural and
well-organized, but also easy to retrieval, retainion, and learning.
Many researches on memory have been launched extensively in the fields
of physiology, psychology, etc. Psychological researchers focus on the
general theory of memory, and have proposed many conceptual models for
memory.
Some
typical
ones
are
episodic
memory,
semantic
memory,
associative memory, and Schank's dynamic memory theory.
