Logic-based expert systems - , Computer Engineering

Logic-based Expert Systems - Artificial intelligence:

Expert systems are agents which are programmed to make decisions about real world situations. They are put together by utilizing knowledge illicitation techniques to additional information from human experts. A specific fruitful area is in diagnosis of diseases, where expert systems are utilized to select what disease a patient has given their symptoms.

Expert systems are one of the major success stories of Artificial Intelligence. Russell and Norvig give a very nice example from medicine:

"A leading expert on lymph-node pathology describes a fiendishly hard case to the expert system, and checks the system's diagnosis. He scoffs at the response to the system. Only slightly worried, the creators of the system suggest he command the computer for an explanation of the diagnosis.In this casethe machine points out the main factors influencing its decision and explains the subtle interaction of many of the symptoms. Eventually, the experts admit his error."

Often,  the  instructions  from  the  expert  are  encoded  as  if-then  instruct  in  first-order  logic  and  the implementation of the expert system may be fairly simply achieved in a programming language such as Prolog.

We can take our card game from the previous chapter as an instance for the implementation of a logic-based expert system. The instructions were: 4 cards are laid on the table face up. The Player 1 selectsthe first card, and in turns, they take it till they both have two cards each. To see who has won, they each add their 2 card numbers, and the winner is the 1 with the biggest even number. The winner scores the even number they have. If there is no even number, or both players gain the same even number, then the game is draw.

It could be argued that undertaking a minimax search is not very essential for this game, because we could simply just specify a set of rules for each player, so that they select cards rationally., we will derive down some Prolog rules to demonstrate thiswhich specify how player one should select the first card.

For instance, imagine the cards dealt were: 4, 5, 6, 10. In this case, the best selection of action for player 1 is to choose the ten, followed presumably by the 4, because player 2 will pick the 6. We have to abstract from this particular example to the general case: we see that there were 3 even numbers and 1 odd one, so player 1 is guaranteed another even number to match the one they chose. This is also true if there are 4 even numbers. So we have our first rule:

  • If there are 3 or 4 even numbered cards, then player one should choose the highest even numbered card in their first go.

When there are 3 or 4 odd cards it is not hard to see that the most rational action for player one is to select the highest odd numbered card:

  • If there are 3 or 4 odd numbered cards, then player 1 should select the highest odd numbered card in their first go.

The only other situation is when there are 2 even and 2 odd cards. I will leave it as an exercise to convince you that there are no instructions governing the choice of player one's first card: they can simply choose randomly, because they are not going to win unless player two makes a mistake, inthis type of case.

Posted Date: 10/2/2012 7:22:55 AM | Location : United States







Related Discussions:- Logic-based expert systems - , Assignment Help, Ask Question on Logic-based expert systems - , Get Answer, Expert's Help, Logic-based expert systems - Discussions

Write discussion on Logic-based expert systems -
Your posts are moderated
Related Questions
Build the circuit using the Asynchronous Counter Technique with JK FF and relevantgates capable of executing the counting sequence as {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}Simulate the cir

Every computer connected to Internet has a unique address. Let's just say your IP address is 1.2.3.4 and you want to send a message to computer with IP address 5.6.7.8. Message you

Q. Graphic symbol of S-R flip-flop? R-S Flip flop - Graphic symbol of S-R flip-flop is displayed in Fig below. It has 3 inputs S (set), R (reset) and C (for clock). Q(t+1) is

Q. Illustrate Shift Micro-operations? Shift is a valuable operation that can be used for serial transfer of data. These operations can also be used along with other (arithmetic

Question: (a) Using an appropriate diagram, illustrate the structure of an instruction used for branching purposes and state the purpose of each part. (b) Given the number

Objectives After studying this unit you should be able to: 1. list various types of reprographic methods, 2. describe uses of various kinds of typewriters, 3. explain

Compare the memory devices RAM and ROM. Ans. Comparison of Semi-conductor Memories RAM ands ROM The advantages of ROM are: 1. This is cheaper than RAM. 2. This is non-volatil

In this assignment, you are required to develop part of a B2C e-Commerce site which is an online movie reservation system for a multiplex theatre. Through the developed site, the u

what inputcombinations may those hazard take place and how can they be eliminated? F1= AB'' + A''C + BC''D'' F2= AB + A''C''D + AB''D

Predicates in propositional model: The predicates take a number of arguments in which for now we assume are ground terms and represent a relationship between those arguments t