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2021 ◽  
Vol 54 (5) ◽  
pp. 789-795
Yamina Haddadji ◽  
Mohamed Naguib Harmas ◽  
Abdlouahab Bouafia ◽  
Ziyad Bouchama

This research paper introduces an adaptive terminal synergetic nonlinear control. This control aims at synchronizing two hyperchaotic Zhou systems. Thus, the adaptive terminal synergetic control’s synthesis is applied to synchronize a hyperchaotic i.e., slave system with unknown parameters with another hyperchaotic i.e., master system. Accordingly, simulation results of each system in different initial conditions reveal significant convergence. Moreover, the findings proved stability and robustness of the suggested scheme using Lyapunov stability theory.

Mathematics ◽  
2021 ◽  
Vol 9 (18) ◽  
pp. 2340
Svetoslav G. Nikolov ◽  
Vassil M. Vassilev

In this paper, the non-linear dynamical behavior of a 3D autonomous dissipative system of Hopf–Langford type is investigated. Through the help of a mode transformation (as the system’s energy is included) it is shown that the 3D nonlinear system can be separated of two coupled subsystems in the master (drive)-slave (response) synchronization type. After that, based on the computing first and second Lyapunov values for master system, we have attempted to give a general framework (from bifurcation theory point of view) for understanding the structural stability and bifurcation behavior of original system. Moreover, a family of exact solutions of the master system is obtained and discussed. The effect of synchronization on the dynamic behavior of original system is also studied by numerical simulations.

2021 ◽  
Vol 23 (4) ◽  
pp. 709-718
Konrad Lewczuk

Automated storage systems have become the basis of warehouse logistics. The article presents a discussion on the reliability and dependability of Automated Storage and Retrieval Systems (ASRS), which are perceived as solutions with high technical reliability. Still, their role in the dependability of the entire warehouse system is to be discussed. The concepts of reliability and dependability in logistics systems like ASRS are defined, and a literature review in this area is presented. On this basis, the factors influencing the dependability of ASRS are discussed in a way not present in the discussion on this topic so far. Then, the ASRS simulation model (based on FlexSim simulation software) is presented. The model tests the influence of ASRS configuration and assigned resources on the dependability of the warehouse as a master system. The summary includes observations on defining the reliability and dependability of ASRS.

A. R. Chasovnikov ◽  
V. M. Lipunov ◽  
E. S. Gorbovskoy

We consider the neutron stars mergers from the point of view of the spinar model. We present calculations of the maximum luminosity of merging neutron stars, both total and in optical ranges. The possibility of observing such gamma-ray bursts using the MASTER system of robotic telescopes is also discussed.

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3190
Ghayyur Hussain ◽  
Muhammad Siddique ◽  
Muhammad Majid Hussain ◽  
Muhammad Tahir Hassan ◽  
Naeem Aslam

Synchronization of N-slave chaotic systems with a master system is a challenging task, particularly in recent times. In this paper, a novel methodology is proposed for synchronizing the N number of slave systems with a master system. The proposed methodology is based on coupled adaptive synchronous observers. The difference between the corresponding states of master and slave systems is converged to the origin by means of a novel feedback control scheme to achieve synchronization between the master and slave systems. The efficacy of the proposed methodology is verified through a simulation of FitzHugh–Nagumo non-linear systems in MATLAB. The simulation results validate and prove claims, and these systems are successfully synchronized by CCS and CCAS observer-based control.

Xin Meng ◽  
Baoping Jiang ◽  
Cunchen Gao

This paper considers the Mittag-Leffler projective synchronization problem of fractional-order coupled systems (FOCS) on the complex networks without strong connectedness by fractional sliding mode control (SMC). Combining the hierarchical algorithm with the graph theory, a new SMC strategy is designed to realize the projective synchronization between the master system and the slave system, which covers the globally complete synchronization and the globally anti-synchronization. In addition, some novel criteria are derived to guarantee the Mittag-Leffler stability of the projective synchronization error system. Finally, a numerical example is given to illustrate the validity of the proposed method.

2021 ◽  
Vol 8 (3) ◽  
pp. 486-498
N. Jayanthi ◽  
R. Santhakumari ◽  

This paper deals with the problem of finite-time projective synchronization for a class of neutral-type complex-valued neural networks (CVNNs) with time-varying delays. A simple state feedback control protocol is developed such that slave CVNNs can be projective synchronized with the master system in finite time. By employing inequalities technique and designing new Lyapunov--Krasovskii functionals, various novel and easily verifiable conditions are obtained to ensure the finite-time projective synchronization. It is found that the settling time can be explicitly calculated for the neutral-type CVNNs. Finally, two numerical simulation results are demonstrated to validate the theoretical results of this paper.

2020 ◽  
Vol 2020 (1) ◽  
Ibtissem Talbi ◽  
Adel Ouannas ◽  
Amina-Aicha Khennaoui ◽  
Abdelhak Berkane ◽  
Iqbal M. Batiha ◽  

Abstract The paper investigates control and synchronization of fractional-order maps described by the Caputo h-difference operator. At first, two new fractional maps are introduced, i.e., the Two-Dimensional Fractional-order Lorenz Discrete System (2D-FoLDS) and Three-Dimensional Fractional-order Wang Discrete System (3D-FoWDS). Then, some novel theorems based on the Lyapunov approach are proved, with the aim of controlling and synchronizing the map dynamics. In particular, a new hybrid scheme is proposed, which enables synchronization to be achieved between a master system based on a 2D-FoLDS and a slave system based on a 3D-FoWDS. Simulation results are reported to highlight the effectiveness of the conceived approach.

Ol’ga G. Smolyaninova ◽  
Nikita A. I Ivanov

The article presents the results of theoretical analysis of the phenomena of informatisation of education, information society and two-level higher education. The specifics of training at the bachelor’s and master’s degrees are indicated, and the interdependence of the bachelor’s and master’s degrees is reflected. The authors conducted a comparative analysis of educational standards for bachelor’s and master’s degrees in pedagogic and psychological-pedagogic areas of training, both the current and previous versions. The results of the analysis indicate a tendency to increase the continuity of bachelor’s and master’s degrees, which is expressed in reducing the gap between the content of standards of the first and second stages of higher education. Also, the comparative analysis showed that in comparison with previous versions, the current standards of pedagogic and psychological-pedagogic directions are more similar to each other in terms of educational results. A crosscutting issue in the article is the use of Internet technologies in the context of two-level higher education and the development of informatisation of society. In the context of the increasing role of Internet technologies in educational activities, in the opinion of the authors, the systemic in nature of informatisation of higher education is significant, in particular, providing the system work of actors in education with the information-educational environment of a higher education institution.

2019 ◽  
Vol 14 (12) ◽  
Liangliang Li ◽  
Yu Huang ◽  
Mingqing Xiao

Abstract Wave dynamics reflect a broad spectrum of natural phenomena and are often characterized by wave equation such as in the development of meta-devices used to steer wave propagation. Modeling synchronization of wave dynamics is critical in various applications such as in communications and neuroscience. In this paper, we study the synchronization problem for oscillations governed by wave equation with nonlinear (van der Pol type) boundary conditions through a single boundary coupling. The dynamics of the master system is self-excited and presents sensitive and rapid oscillations. With the only signal received at one end of the boundary, by constructing a mathematical model, we show the existence of a slave system that can be synchronized with the master system via the study of wave reflections on the boundary to recover the actual wave dynamics. The coupling gain, which represents the strength of the connection between the master system and the slave system, has been identified. The obtained result can be also viewed as an observer construction when the measurable output is only on the boundary. Numerical simulations are provided to demonstrate the effectiveness of the theoretical outcomes.

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