Rough Set Approximation under Dynamic Granulation
动态粒度下的粗糙集近似

Granular computing is emerging as a powerful tool for rough set theory. In this paper, we discuss rough set approximation under granulation, and establish positive approximation under dynamic granulation. In addition, mea- sure of harmony between clustering and transcendent knowledge is defined, and a clustering arithmetic based on posi- tive approximation under dynamic granulation is proposed. These results will be helpful for studying for granular computing and rough set theory.