The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Mikio Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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natural Synchronization of wireless sensor networks by noise induced phase Synchronization Phenomenon
IEICE Transactions on Communications, 2013Co-Authors: Hiroyuki Yasuda, Mikio HasegawaAbstract:SUMMARY We propose a natural Synchronization scheme for wireless uncoupled devices, without any signal exchange among them. Our proposed scheme only uses natural environmental fluctuations, such as the temperature or humidity of the air, the environmental sounds, and so on, for the Synchronization of the uncoupled devices. This proposed Synchronization is realized based on the noise-induced Synchronization Phenomenon, uncoupled nonlinear oscillators synchronize with each other only by adding identical common noises to each of them. Based on the theory of this Phenomenon, the oscillators can also be synchronized by noise sequences, which are not perfectly identical signals. Since the environmental natural fluctuations collected at neighboring locations are similar to each other and cross-correlation becomes high, our proposed scheme enabling Synchronization only by natural environmental fluctuations can be realized. As an application of this proposed Synchronization, we introduce wireless sensor networks, for which Synchronization is important for reducing power consumption by intermittent data transmission. We collect environmental fluctuations using the wireless sensor network devices. Our results show that the wireless sensor network devices can be synchronized only by the independently collected natural signals, such as temperature and humidity, at each wireless sensor device.
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Synchronization of wireless sensor networks using natural environmental signals based on noise induced phase Synchronization Phenomenon
Vehicular Technology Conference, 2012Co-Authors: Makoto Harashima, Hiroyuki Yasuda, Mikio HasegawaAbstract:We show that the wireless sensor networks can be synchronized by natural environmental signals, such as temperature, humidity and so on. The proposed Synchronization scheme is based on the noise-induced phase Synchronization theory; the phases of the periodical limit cycle orbits of nonlinear oscillators synchronize with each other by adding a common noise signal to the oscillators. Based on this theory, we synchronize the clocks of the wireless sensor nodes by tuning them according to the phase of their nonlinear oscillator to which natural environmental signals are added as noise. In this paper, first we analyze cross-correlation of the natural environmental signals measured by ZigBee wireless sensor nodes, which are arranged outdoor at about 20m intervals, and show that the cross- correlation among the signals sensed at different sensor nodes are around 0.8 or higher. According to this result, we analyze possibility of the noise- induced phase Synchronization with changing cross- correlation between the additive noises, and clarify that the nonlinear oscillators can be synchronized in the cases that the cross-correlation becomes around 0.8 or higher. Finally, we investigate feasibility of the noise-induced phase Synchronization by actual data of natural environmental signals sensed at each sensor node and show it is possible to synchronize wireless sensor nodes without any interactions or communications among them.
Ioannis N. Stouboulos - One of the best experts on this subject based on the ideXlab platform.
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image encryption process based on chaotic Synchronization phenomena
Signal Processing, 2013Co-Authors: Christos K. Volos, Ioannis M. Kyprianidis, Ioannis N. StouboulosAbstract:This paper presents a novel image encryption scheme, which uses a chaotic True Random Bits Generator (TRBG). The chaotic TRBG is based on the coexistence of two different Synchronization phenomena. The first one is the well-known complete chaotic Synchronization while the second one is a recently new proposed Synchronization Phenomenon, the inverse π-lag Synchronization. This coexistence is observed in the case of two mutually coupled identical nonlinear circuits. The nonlinear circuit, which is used, produces double-scroll chaotic attractors. The initial conditions of the coupled system and the values of the circuit's parameters serve as the private key of the proposed cryptographic scheme. In order to face the challenge of using this chaotic TRBG in such cryptographic schemes, the produced bits sequence is subjected to statistical tests which are the well-known Federal Information Processing Standards-140-2. This bits sequence has then been used to encrypt and decrypt gray-scale images. Also, the security analysis of the encrypted image demonstrates the high security of the proposed encryption scheme. Highlights? We develop an image encryption scheme based on a chaotic random bits generator. ? The coexistence of Synchronization phenomena is the main feature of this generator. ? The complete and the inverse π-lag are the observed Synchronization phenomena. ? The nonlinear circuit, which is used, produces double-scroll chaotic attractors. ? The high security of the proposed encryption scheme is confirmed.
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various Synchronization phenomena in bidirectionally coupled double scroll circuits
Communications in Nonlinear Science and Numerical Simulation, 2011Co-Authors: Christos K. Volos, Ioannis M. Kyprianidis, Ioannis N. StouboulosAbstract:Abstract In this paper, the various cases of Synchronization phenomena investigated in a system of two bidirectionally coupled double scroll circuits, were studied. Complete Synchronization, inverse lag Synchronization, and inverse π-lag Synchronization are the observed Synchronization phenomena, as the coupling factor is varied. The inverse lag Synchronization Phenomenon in mutually coupled identical oscillators is presented for the first time. As the coupling factor is increased, the system undergoes a transition from chaotic deSynchronization to chaotic complete Synchronization, while inverse lag Synchronization and inverse π-lag Synchronization are observed for greater values of the coupling factor, depending on the initial conditions of the state variables of the system. Inverse π-lag Synchronization in coupled nonlinear oscillators is a special case of lag Synchronization, which is also presented for the first time.
Guanrong Chen - One of the best experts on this subject based on the ideXlab platform.
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A Time-Varying Complex Dynamical Network Model And Its Controlled Synchronization Criteria
arXiv: Adaptation and Self-Organizing Systems, 2004Co-Authors: Guanrong ChenAbstract:Today, complex networks have attracted increasing attention from various fields of science and engineering. It has been demonstrated that many complex networks display various Synchronization phenomena. In this paper, we introduce a time-varying complex dynamical network model. We then further investigate its Synchronization Phenomenon and prove several network Synchronization theorems. Especially, we show that Synchronization of such a time-varying dynamical network is completely determined by the inner-coupling matrix, and the eigenvalues and the corresponding eigenvectors of the coupling configuration matrix of the network.
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pinning a complex dynamical network to its equilibrium
IEEE Transactions on Circuits and Systems I-regular Papers, 2004Co-Authors: X Li, Xiaofan Wang, Guanrong ChenAbstract:It is now known that the complexity of network topology has a great impact on the stabilization of complex dynamical networks. In this work, we study the control of random networks and scale-free networks. Conditions are investigated for globally or locally stabilizing such networks. Our strategy is to apply local feedback control to a small fraction of network nodes. We propose the concept of virtual control for microscopic dynamics throughout the process with different pinning schemes for both random networks and scale-free networks. We explain the main reason why significantly less local controllers are required by specifically pinning the most highly connected nodes in a scale-free network than those required by the randomly pinning scheme, and why there is no significant difference between specifically and randomly pinning schemes for controlling random dynamical networks. We also study the Synchronization Phenomenon of controlled dynamical networks in the stabilization process, both analytically and numerically.
Shihua Chen - One of the best experts on this subject based on the ideXlab platform.
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coexistence of anti phase and complete Synchronization in the generalized lorenz system
Communications in Nonlinear Science and Numerical Simulation, 2010Co-Authors: Qing Zhang, Shihua ChenAbstract:This paper investigates a class of new Synchronization Phenomenon. Some control strategy is established to guarantee the coexistence of anti-phase and complete Synchronization in the generalized Lorenz system. The efficiency of the control scheme is revealed by some illustrative simulations.
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an intriguing hybrid Synchronization Phenomenon of two coupled complex networks
Applied Mathematics and Computation, 2010Co-Authors: Wen Sun, Zhong Chen, Shihua ChenAbstract:This paper investigates the hybrid Synchronization problem of two coupled complex networks. Employing the linear feedback and the adaptive feedback control methods which are simple, efficient, and easy to implement in practical applications, we obtain some useful criteria of the hybrid Synchronization of two coupled networks based on the Lyapunov stability theory and Lasalle's invariance principle. It shows that under suitable conditions, two coupled complex networks can realize an intriguing hybrid Synchronization: the outer anti-Synchronization between the driving network and the response network, and the inner complete Synchronization in the driving network and the response network, respectively. Numerical simulations demonstrate the effectiveness of the proposed hybrid Synchronization scheme.
Luc Loron - One of the best experts on this subject based on the ideXlab platform.
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a nonlinear Phenomenon on self oscillating current controllers the indirect Synchronization
IEEE Transactions on Industrial Electronics, 2010Co-Authors: Jeanchristophe Olivier, J Le C Claire, Luc LoronAbstract:In this paper, a particular Phenomenon called indirect Synchronization is investigated on self-oscillating current controllers. This Phenomenon appears in medium frequencies, when the reference signal frequency tends to the switching frequency. In a previous work, it has been shown that the indirect Synchronization causes discontinuities on the frequential response of the system, making the various linear or continuous models inefficient. For high-accuracy applications, such as active filtering or high-precision power supply, these discontinuities are a real problem. Thus, it seems important to offer an analytical description of this Phenomenon. In this paper, an analytical model of the indirect Synchronization Phenomenon is proposed and checked by simulation and experimental results.
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indirect Synchronization Phenomenon on self oscillating current controllers
Conference of the Industrial Electronics Society, 2007Co-Authors: Jeanchristophe Olivier, J Le C Claire, Luc LoronAbstract:In this paper, a particular Phenomenon called indirect Synchronization is investigated on self-oscillating current controllers based on a hysteresis controller and a recent relay- feedback controller without hysteresis. The main effect of this indirect Synchronization is a modification of regulation behavior when the system works in high frequency. This study is thus particularly useful for applications such as active filtering or high precision power supply, where the signals to target can be close to the fifth of the switching frequency. Simulation results highlight this indirect Synchronization Phenomenon and thus show relevance to take it into account for high accuracy applications.
