Expert-Systems AI Pres

8/8/2019 Expert-Systems AI Pres

1/21

EXPERT SYSTEMSBY

Rehan Muhammad Tariq

Roll No: -13

8/8/2019 Expert-Systems AI Pres

2/21

Overview

What is an Expert System?

History

Components of Expert System

W

ho is involved?Development of Expert System

8/8/2019 Expert-Systems AI Pres

3/21

WHAT IS AN EXPERT SYSTEM?

An expert system is a

computer program thatcontains some of the subject-

specific knowledge of one or

more human experts.

Theimage cannotbe displayed.Your computer may nothaveenough memory toopen theimage,or theimagemay havebeen corrupted.Restartyour computer,and then open thefileagain.If thered x stillappears,you may haveto deletetheimageand then insertitagain.

8/8/2019 Expert-Systems AI Pres

4/21

8/8/2019 Expert-Systems AI Pres

5/21

Theimagecannot bedisplayed. Your computer may nothaveenough memory toopen theimage, or theimagemay havebeencorrupted.Restartyour computer,and then open thefileagain.I fthe red x stillappears,you may havetodeletethe imageand then insertitagain. Early 70s

Goal of

AIscientists

develop computer

programs that could in some sense think

.

In 60s general purpose programs were

developed for solving the classes ofproblems but this strategy produced no

breakthroughs.

In 1970 it was realized that Theproblem-solving power of program

comes from the knowledge it possesses.

8/8/2019 Expert-Systems AI Pres

6/21

To make a programintelligent, provide it with

lots of high-quality, specific

knowledge about some

problem area.

8/8/2019 Expert-Systems AI Pres

7/21

Building Blocks of Expert

System

Theimage cannotbe displayed.Your computer may nothave enough memory toopen theimage,or the imagemay havebeen corrupted.Restartyour computer,and then open thefileagain.If thered x stillappears, you may havetodeletetheimage and then insertitagain.

8/8/2019 Expert-Systems AI Pres

8/21

Knowledge base (facts)

Production Rules ("if.., then..")

Inference Engine (controls how "if..,

then.." rules are applied towards facts)

User Interface

8/8/2019 Expert-Systems AI Pres

9/21

Knowledge Base

The component of an expert system

that contains the systems knowledge.

Expert systems are also known as

Knowledge-based systems.

8/8/2019 Expert-Systems AI Pres

10/21

Knowledge Representation

Knowledge is represented in a computer

in the form of rules ( Production rule).

Consists of an IF part and THEN part.

IF part lists a set of conditions in some

logical combination.

If the IF part of the rule is satisfied;

consequently, the THEN part can beconcluded.

8/8/2019 Expert-Systems AI Pres

11/21

Inference Engine

An inference engine tries to derive

answers from a knowledge base. It is the brain of the expert systems

that provides a methodology for

reasoning about the information in

the knowledge base, and for

formulating conclusions.

8/8/2019 Expert-Systems AI Pres

12/21

User Interface

It enables the userto

communicatewith anexpertsystem.

Theimage cannotbe displayed.Your computer may nothaveenough memory toopen theimage,or theimagemay havebeen corrupted.Restartyourcomputer,and then open thefile again.If thered x stillappears, you may haveto deletetheimage and then insertitagain.

8/8/2019 Expert-Systems AI Pres

13/21

8/8/2019 Expert-Systems AI Pres

14/21

Knowledge Engineer

A knowledge engineer is a computer

programmer who knows how to design and

implement programs that incorporate

artificial intelligence techniques.

8/8/2019 Expert-Systems AI Pres

15/21

8/8/2019 Expert-Systems AI Pres

16/21

Knowledge Engineering

The art of designing and building the

expert systems is known as

K

NOWL

EDGE ENGI

NEERI

NG. Knowledge engineering relies heavily

on the study of human experts in

order to develop intelligent & skilled

programs.

8/8/2019 Expert-Systems AI Pres

17/21

Developing Expert Systems

Determining the characteristics of the

problem.

Knowledge engineer and domain

expert work together closely to

describe the problem.

8/8/2019 Expert-Systems AI Pres

18/21

Successful An expert system is judged to be

entirely successful when it operates

on the level of a human expert.

8/8/2019 Expert-Systems AI Pres

19/21

Human Expertise vs

Artificial Expertise

1. Perishable

2. Difficult to transfer

3. Difficult to document

4. Unpredictable

5. Expensive

1. Permanent

2. Easy to transfer

3. Easy to

document

4. Consistent5. Affordable

8/8/2019 Expert-Systems AI Pres

20/21

Some Prominent Expert

Systems Dendral

Dipmeter Advisor

Mycin

R1/Xcon

8/8/2019 Expert-Systems AI Pres

21/21

THANK YOU

Theimage cannotbe displayed.Your computer may nothaveenough memory toopen theimage,or theimagemay havebeen corrupted.Restartyour computer,and then open thefileagain.If thered xstillappears,you may havetodeletetheimageand then insertitagain.

THE END