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This paper introduces a color image encryption algorithm that relies on fractional chaotic systems as source of pseudorandom numbers, the decryption process needs to reconstruct the states of the fractional chaotic system, for this purpose a fractional exponential polynomial observer will be used, this observer has the characteristic that makes synchronization error decrease faster than an exponential...
This paper studies the problem of lag synchronization for a kind of neural networks with mixed delays including discrete and distributed delays via adaptive intermittent control. By using stability analysis method and introducing a piecewise continuous auxiliary function, some global lag synchronization criteria are derived. It is noted that the control periods as well as the control widths in our...
This paper analyzes multi-switching network transmission synchronization (MSNTS) problem among three uncertain chaotic systems with unknown parameters. By constructing the effective switching rules, the definition of MSNTS is given and the synchronization schemes are proposed to reach synchronization between any different states of each derive system and any desired states of every respond system...
In this note, an adaptive fuzzy logic control (AFLC) strategy based on active sliding mode theory is considered to control a class of chaotic fractional-order systems. The main contribution in this work is the use of a saturation function to eliminate the chattering action in the control and surface signals. The nonlinear fractional order chaotic systems are identified using fuzzy logic sets. Based...
In this paper, we investigate the chaos synchronization of uncertain optical chaotic systems. More precisely, we also present a systematic approach for designing a fractional-order sliding mode controller to achieve a rapid, robust and perfect chaos synchronization. By this robust controller, it is rigorously proven that the associated synchronization error is Mittag-Leffler stable. In a numerical...
This paper presents a secure image transmission based on a chaotic synchronization. Chaotic systems present unpredictable and complex behavior. These characteristics, together with the dependence on the initial conditions as well as the tolerance of this type of systems, make theme ideal for transmission. In this paper a system of encryption based on chaotic signal is proposed. This system is used...
Chaotic modulation is a strong method of improving communication security. Analog and discrete chaotic systems are presented in actual literature. Due to the expanse of digital communication, discrete-time systems become more efficient and closer to actual technology. The present contribution presents a reliable design method for a discrete-time nonlinear emitter, based on an analogue prototype. The...
This paper studies the transmission synchronization (TS) problem among multiple coupled chaotic systems by considering unknown parameters. In the solving process, we firstly select a special integral sliding surfaces, and then we develop an effective controller with the compensation terms to guarantee the asymptotical stability of all TS error systems. Simultaneously, we design the proper adaptive...
In this paper, the control problems of the permanent magnet synchronous motor (PMSM) system are investigated extensively. Some single input controllers were proposed to realize the control problems of such system, such as stabilization, synchronization, coexistence of anti-synchronization and synchronization, projective synchronization. It is noted that there exist two different single input controllers...
We have numerically demonstrated a high-speed bidirectional chaotic communication, where chaotic optical signal with suppressed time delay signature is used. In this scheme, the output of a third semiconductor laser is used as the common signal driving the other two identical lasers with self-feedback to be synchronized. To enhance the bandwidth of the chaotic signal employing in the communication,...
This paper proposes a chaos-based communication scheme which transmits a secret speech signal. To recover the states of the transmitter and the unknown message, the receiver uses a high order sliding mode observer. Its input is one of the states of the transmitter. The control parameters of the observer constitute the secret key of the transmission. The main aspect in which the present work differs...
This paper investigates the synchronization of fractional-order general complex dynamical networks with coupling delay. Based on the stability theory of the fractional-order system, the sufficient criteria for synchronization are derived analytically by applying the linear control methods. The proposed synchronization method is applicable to almost all kinds of coupled fractional-order general complex...
In this paper, quantized and triggered control is utilized to sample output error signal for output feedback synchronization of two Lurie systems (formed by linear part and nonlinear one constructed only by the measurable output) under limited transmission capacity. With the characteristics of output error, we come up with practical quantized and triggered strategy to sample the output error instead...
In this paper, finite-time synchronization (FTS) problems in an array of unified chaotic and hyperchaotic systems are mainly studied using some important control methods. First, FTS and finite-time transmission synchronization (FTTS) for N systems are realized in a finite time by designing the effective control schemes, and the stability criteria can be given. The corresponding examples are presented...
In this article, we study finite-time synchronization of complex network with unknown parameter by applying a new type of sliding form controller. On account of the theory for finite-time control, we introduce a new type of sliding form surface. We testify that the system converge to the zero point in a given finite-time. Then we propose a sliding form controller which guarantee that the sliding movement...
For the problem of the synchronization between two chaotic systems with external disturbances and nonlinear input, based on the Lyapunov's stability theory and combined the finite time principle with control technology existed, a sliding mode controller was designed by a new type of sliding surface and the corresponding control rule of sliding mode selectivity to achieve the synchronization control...
This paper is mainly concerned with the issues of two kinds of synchronization for a class of hyperchaotic systems, i.e., complete synchronization, and coexistence of synchronization and anti-synchronization. Two adaptive control laws with suitable state feedbacks are designed to realize the complete synchronization, and coexistence of synchronization and anti-synchronization for such hyperchaotic...
For a class of chaotic systems with uncertain nonlinear time-delay functions and exogenous disturbance, the problem of observer-based adaptive synchronization is investigated. Based on Lyapunov-Krasovskii fucntional method, a delay-free observer is presented by using sliding mode control and adaptive control techniques. Two numerical simulations are given to show the effectiveness of the proposed...
This paper investigates synchronization problem of two identical chaotic Lur'e systems with time delay using sampleddata control. Firstly, a novel piecewise Lyapunov-Krasovskii function (LKF), which considers fully useful information of the systems and their cross terms, is introduced. Secondly, a new synchronization criterion is developed in terms of linear matrix inequalities (LMIs) by discarding...
In this paper, the adaptive synchronization transmission of target signal within the nonlinearly unidirectional-coupled neural network is proposed, in which individual neuron is described by the FitzHugh-Nagumo (FHN) model in external electrical noisy environment. We design a network architecture of the unidirectional-coupled FHN system and propose an adaptive coupling strategy to synchronize the...
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