Abstract:  As a kind of knowledge, a scheme of injection mould modification is represented hierarchically. Then, such knowledge is structuralized, which is shown to be information system homomorphism. Based on theories of information system homomorphism, the relation between feature reduction and information system homomorphism invariance is analyzed. Results show that feature reduction of the injection mould modification knowledge at different scheme levels is compatible with the feature decision tables. Thus, the structuralization of the injection mould modification knowledge is useful for knowledge representation and induction in mould modification.

Key words: information system homomorphism, injection mould modification knowledge induction, knowledge compatibility