ITS系统中基于关系模型的知识表示

在计算机智能导师系统(ITS)中，知识表示是一个关键问题。它是计算机智能教学的基础，其结构决定了智能推理过程的有效性。同时教学系统还必需具有大量多媒体数据的管理能力，学科知识库与教学材料库结合也是一个重要问题。本文使用关系模型讨论建立学科知识库的方法。首先把学科知识分解为知识点，用关系模型来组织知识点，形成知识点属性库和链接库。知识点属性库描述知识点的特性和与多媒体教学材料库的连接关系；知识点链接库反映知识点间的关系，便于推理。为了形成系统的教学过程，还必需建立教学策略库，以规定教学策略模板和规则。本文使用机械制图课程中的圆锥体一节作为例子，展开讨论。

Relational Knowledge Representation Model in Intelligent Tutor System

The knowledge representation is a key aspect in the computer Intelligent Tutor S ystem(ITS),which determines the effect of the inference process.Moreover,it is n ecessity of the combination of the knowledge base with the teaching material bas e in ITS because it contains a lot of multimedia data. In this paper, a discussi on of construction of the knowledge base by the relational model(RM) is presente d.We analyze the knowledge into groups, each one called a knowledge point.Then,u se RM to organize the knowledge points to form two databases; one is called the attribute database, and the other called linkage database. The attribute databas e gives each knowledge point attributes and a link to the teaching material base , while the linkage database describes the relation among knowledge points.This linkage database is suitable for ratiocination. In order to build the systematic teaching courses, we construct a strategy database.As an example, we discuss th e knowledge representation of the cone section in the mechanical drawing class.