中文摘要：

首先,讨论3种勾股模糊数排序方法的特点,指出其中两种排序方法的不足;其次,研究勾股模糊集的结构特征,指出勾股模糊数本质上由隶属度、非隶属度、自信度和自信度方向4个特征参数完全刻画;再次,利用上述4个参数分别构造勾股模糊数和勾股模糊集之间的海明距离、欧几里得距离和闵可夫斯基距离,并研究这些距离公式的性质;最后,借助理想点法给出基于勾股模糊集距离的多属性决策方法,并通过实例验证所提方法的合理性.

英文摘要：

Firstly, via comparing the features of intuitionistic fuzzy set（FS） and Pythagorean fuzzy set（PFS）, three ranking methods for Pythagorean fuzzy numbers（PFNs） are analyzed, and some flaws of two ranking methods are pointed out.Then, it is illuminated that each PFN is characterized by four parameters, i.e., the membership degree, the nonmembership degree, the strength of commitment and the direction of strength. Simultaneously, the distance measures of PFSs and PFNs are investigated. The Hamming distance measure, the Euclidean distance measure and the Minkowski distance measure between PFSs and PFNs are proposed, and the desired properties are discussed. Finally, a multiple attribute decision making method in the Pythagorean fuzzy environment based on the proposed distance measures is presented. A numerical example is provided to illustrate the validity and applicability of the presented approach.