Information Technology Reference
In-Depth Information
solution forms, or be postponed until some exceptions arise during the
execution of the suggested solution. Revision is generally fulfilled by adding
new content to or deleting some content from the suggested solutions, and
replacement or retransformation of some parts of the suggested solution.
The revise methods can be classified into four types: substitution,
transformation, special-purpose adaptation and repair, and derivational replay.
1. Substitution
Substitution is a class of structural adaptation techniques that get the
suggested solution by appropriate component substitutions. It includes:
(1) Reinstantiation, is used to instantiate features of an old solution with new
features. For example, CHEF can reinstantiate chicken and snow peas in a
Chinese recipe with beef and
thereby creating a new recipe.
(2) Parameter adjustment, a structural adaptation technique that compares
specified parameters of the retrieved and current case to modify the
solution in an appropriate direction. It is a heuristics method for
parameters with numeric values, and depends on the concrete models of
input and output.
(3) Local search, is the method using additional knowledge as heuristics to
find replacement values. For example, in pastry design, in the absence of
oranges, we can use this method to search some fruit similar to oranges
(such as apples) as a second choice with the help of knowledge about
fruit.
(4) Query, obtains the substitution content by the conditional queries to case
base or additional knowledge base.
(5) Specialized search, searches the case base and knowledge base at the same
time, and use the knowledge base as heuristics to direct its search in the
case bases.
(6) Case-based substitution, uses other cases to propose a substitution.
2. Transformation
Transformation includes: (1) common-sense transformation, which replaces,
deletes or increases some components to the old solution by basic and
easy-understood commonsense. The typical transformation method is “to
delete the secondary components”. (2) model-guided repair, which uses a
causal model to guide adaptation and often used in diagnosis systems.
3. Special-purpose adaptation and repair
This kind of method is used mainly in the domain-dependent and structural
adaptations. Various heuristics are used to index the potential useful cases.
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