Lesson 19 - Module 8 Other representation formalisms...

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Module 8 Other representation formalisms Version 1 CSE IIT, Kharagpur
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8.1 Instructional Objective The students should understand the syntax and semantic of semantic networks Students should learn about different constructs and relations supported by semantic networks Students should be able to design semantic nets to represent real life problems The student should be familiar with reasoning techniques in semantic nets Students should be familiar with syntax and semantic of frames Students should be able to obtain frame representation of a real life problem Inferencing mechanism in frames should be understood. At the end of this lesson the student should be able to do the following: Represent a real life problem in terms of semantic networks and frames Apply inferencing mechanism on this knowledge-base. Version 1 CSE IIT, Kharagpur
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Lesson 19 Semantic nets Version 1 CSE IIT, Kharagpur
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8. 2 Knowledge Representation Formalisms Some of the abstract knowledge representation mechanisms are the following: Simple relational knowledge The simplest way of storing facts is to use a relational method where each fact about a set of objects is set out systematically in columns. This representation gives little opportunity for inference, but it can be used as the knowledge basis for inference engines. Simple way to store facts. Each fact about a set of objects is set out systematically in columns. Little opportunity for inference. Knowledge basis for inference engines. We can ask things like: Who is dead? Who plays Jazz/Trumpet etc. ? This sort of representation is popular in database systems. Inheritable knowledge Relational knowledge is made up of objects consisting of attributes corresponding associated values. We extend the base more by allowing inference mechanisms: Property inheritance o elements inherit values from being members of a class. o data must be organised into a hierarchy of classes. Version 1 CSE IIT, Kharagpur
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Boxed nodes -- objects and values of attributes of objects. Values can be objects with attributes and so on. Arrows -- point from object to its value. This structure is known as a slot and filler structure, semantic network or a
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This note was uploaded on 09/20/2010 for the course MCA DEPART 501 taught by Professor Hemant during the Fall '10 term at Institute of Computer Technology College.

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Lesson 19 - Module 8 Other representation formalisms...

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