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
Q. If a plane is in the air also there is a fly flying inside the plane does the plane get heavier when the fly lands? Answer:- It is true that a fly puts weight on a plan

Differentiate between non-relocatable and relocatable programs. A non-relocatable program is one which cannot be executed in any memory area other than the area starting at i

Consider a network message transfer among a source S and a destination D by 3 routers R1, R2 and R3 as given below:-               S -------- R1 --------- R2 --------- R3 ---

WestEast College hires you as a systems analyst to design its new admission/registration system. WestEast College is one of the top ranked schools in the United States. It is a

Communication displays give support in determining the frequency of communication, whether congestion in message queues or not, volume and the type of patterns being communicated e

Web server security through SSL (Secure Socket Layer) As it is well known that the Intranets and internet are purely based on use of powerful web servers to deliver information

Q. Define the ADDRESSING MODES? The elementary set of operands in 8086 can reside in memory, register and immediate operand. How can these operands be retrievedby various addre

Question: a) What are the reasons for feedback in a control system? b) What are the roles of the configuration and fault managers in a real-time system? c) What are stimu

Define Process Process is a program in execution; process execution should progress in sequential fashion. A process involves: a) Program counter  b) Stack c) Data se

What are the Input devices Various devices are available for data input on graphics workstations. Most systems have a keyboard and one or more additional devices specially desi