INLS 150 Getting Ready 10

INLS 150

Organizing Information

Getting Ready for Session #10 (September 30, 1996)

Knowledge & Knowledge Representation:

Structured Objects (Semantic Networks & Frames)

Durkin, J. (1994). Expert Systems: Design and Development. Englewood Cliffs, NJ: Prentice-Hall. [QA76.76.E95 D87 1994b] & [PAM] pp. 68-80

This selection presents semantic networks and frames as knowledge representation approaches.

A semantic network is a graphical representation of the important objects, attributes (features) and relationships relating to the knowledge problem of interest. It looks strangely similar to an object model.

What problems do you see with semantic networks as a knowledge representation approach? Hint: What would happen if you added additional instances of birds or attributes (features) to figure 3.10 in Durkin?

A frame represents typical knowledge about an object including both factual and procedural knowledge as well as relationships to other frames.

How is a frame similar or dissimilar to a semantic network? From a rule or set of rules?

Why might you prefer one approach (rules, semantic nets, frames) over the others?

How might you use a set of frames to help you to make inferences about an instance of an object?

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