Synchronization of the near-identical chaotic systems with the unknown parameters

In this paper, the synchronization of the near-identical chaotic systems with the unknown parameters is investigated. It can be classified into two cases, i.e., if the matrix I+SI+S is uniformly negative definite in yy, the synchronization is achieved without couple, or else, it is obtained with the unidirectional couple, by constructing parameter update law. The theoretical results of the synchronization are, respectively, simulated by the non-linear dynamical software, WinPP. The numerical simulation results are in very good agreement with the theoretical results. It indicates that the method employed in this paper is correct.