关键词: 计算机应用, 功能树, 析取范式树, 物元相似度

Abstract: Function models are the core objects of conceptual design. Function tree is a
typical function model which is widely used. Defects are found while the similarity of arbitrary
function trees is calculated by existing method. Therefore, the concept of disjunctive normal form
tree is proposed based on Boolean algebra. After that two solutions of Disjunctive normal form
tree are presented. And a method on similarity calculation of arbitrary function trees is described.
Thus, the application of function trees’ similar extension is expanded. As a result, the solution
space is enlarged, and the possibility to attain innovational solutions increases. At last, an
application example demonstrates the effectiveness of the method.

Key words: computer application, function tree, disjunctive normal form tree;
matter-element similarity degree