inexact knowledge

Our system adopts tree hierarchy semantic network and causal network model according to different knowledge content, applys inexact mixed reasoning to enhance the veracity of the result.

系统根据蔬菜栽培知识的内容不同分别采用了树形层次语义网络和因果网络模型两种知识表示形式，并运用了不精确混合推理策略，使得系统推理更快更准确。

Ultimate reason is that there is not breakthrough in the theory methods of system's knowledge express and management The problem that expert system must solve is that how to acquire inexact knowledge and relation, at the basis of which, a correct conclusion must be drawn.

其根本原因在于系统的知识表示和处理的理论方法上没有取得突破。如何获得不准确或不确切的知识和关系，并在此基础上做出正确的结论就成为专家系统所需要解决的一个问题。

Expert knowledge in agriculture is deal with by inexact reasoning.

采用不精确推理处理农业领域中的专家知识。

A Study of the Inexact Knowledge Base Resource

非确定性知识库资源的研究

Interval valued ( I v) fuzzy sets and vague sets are two new theories representing inexact knowledge.

区间值（i-v）模糊集合和Vague集是不精确知识表达的两种新理论。