“…On the other hand, various synchronization schemes have been proposed such as linear and nonlinear feedback synchronization method [21][22][23][24], adaptive synchronization method [25][26][27][28][29][30][31], time-delay feedback method [32,33], backstepping control method [34,35], sliding mode control method [36,37], and impulsive synchronization method [38,39]. Among them, adaptive control and nonlinear control methods are often used to solve the problems on synchronization of systems with unknown parameters or time-varying parameters, which are usually encountered in practical applications.…”