Set-valued ordered information systems under dominance relation

Set-valued ordered information systems could be divided into conjunctive/disjunctive set-valued ordered information systems.Through analyzing the limitations of the existing dominance relations in conjunctive/disjunctive set-valued ordered information systems and discussing the unreasonable situations,new dominance relations which could classify objects better were proposed.Based on this,rough set models in conjunctive/disjunctive set-valued ordered information systems were constructed,and the validity of the proposed technique was checked with classical instances.