Application of expert system

1. Expert System
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2. Why use Expert Systems?
Experts are not always
available. An expert
system can be used
anywhere, any time.
Human experts are not
100% reliable or
consistent
Experts may not be good
at explaining decisions
Cost effective
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3. When an expert system can be used:
An expert system can be used if
a) The problem cannot be specified in terms of a well
defined algorithm.
b) When the task is hazardous
c) There is scarcity of experts in the area.
d) The problem requires consistency and standardization.
e) Human experts have successfully solved similar
problems.
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4. LITHIAN: Gives advice
to archaeologists
examining stone tools
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5. DENDRAL: Used to
identify the structure of
chemical compounds.
First used in 1965
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6. An expert system can be defined as a
knowledge based information systemthat
uses the knowledge specific to an area or
domain to act as a source of information
to the users.
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7. Characteristics of Expert System
a)It is capable of handling challenging decision problems.
b)It uses knowledge rather than data for solution.
c) The knowledge is encoded and maintained separately.
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8. Advantages
a)It enhances decision quality.
b) It reduces the cost of consulting experts for solving the
problem.
c) It provides quick and efficient solutions to problem.
d) It offers high reliability.
e) It can tackle very complex problem that are difficult for
human experts to solve.
f) It gathers scarce expertise and use it efficiently.
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9. Disadvantages
a) It is difficult to extract expertise from human experts and
hence the knowledge base may not be complete.
b) Each problem situation is different from problem to
prblem. Hence, the solution suggested by human experts
is bound to be different from expert system solution.
c) The cost and time required for developing the expert
system are very high.
d) Large expert system are difficult to develop and
maintain.
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