Essay On Synchronization Of Chaos System

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System [14] etc.display chaotic behavior. A hyper chaos system is considered as a chaotic attractor having more than one positive Lyapunov exponents which gives the randomness and higher unpredictability of the corresponding system so the hyper chaos may be more useful in some fields such as communication, encryption etc. On the other hand the area which attracted much attention is chaos synchronization since the seminal work of Pecora and Carroll [12] recently synchronization of fractional-order chaotic systems starts to attract increasing attention due to its potential applications in secure communication and control processing. There are many types of synchronization for the fractional-order chaotic systems which are investigated, such as Cs [17], Gs [15], PHs [16], As [18], Ps [19, 20, 22] etc. Amongst all projective synchronization, which was first reported by Mainieri and Rehacek [19], is one of the most noticeable one because it can obtain faster communication with its proportional feature [21, 23]. In PS, the responses of the two systems synchronized up to a constant scaling factor. Recently, on account of linear separation Wang and He [26] introduced projective synchronization of the fractional-order chaotic systems Then GPS of the fractional-order chaotic systems was studied in [20, 24]. However, in the above studies, all the states of the drive and response systems synchronize up to an identical constant scaling factor. In [25], Chen et al. proposed a new hyper chaotic system through adding a nonlinear controller of the three- dimensional autonomous chaotic system. More recently, by stability theory of fractional- order systems and tracking control technique the function projective synchronization between fractional-or...

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...cal techniques which are numerically stable and can be used to both linear and nonlinear fractional differential equation [28]have been developed in the literature. For finding the numerical approximation more accurate and for reducing the computational cost here we choose the Caputo version and predictor-corrector algorithm for fractional differential equation [29],.According to the fractional predictor-corrector algorithm, we find that hyper chaos exist in new four-dimensional fractional order system. In the numerical results the system parameters are chosen as a = 10, b = 28, c = 8/3 and d = 1. Numeric results shows that when 0.9    1, the fractional- order system (2) always exhibits hyper chaotic behaviors. The two Lyapunov exponents τ_1=0.9,τ_2=0.08 are obtained when  = 0.9 is chosen. If  < 0.9 then in system (2) there is no hyper chaos exist. As shown

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