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Wyświetlanie 1-15 z 89
Tytuł:
Strongly chaotic dendrites
Autorzy:
Charatonik, J.
Charatonik, W.
Powiązania:
https://bibliotekanauki.pl/articles/966848.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
order
strongly rigid
rigid
homeomorphism
strongly chaotic
dendrite
chaotic
Opis:
The concept of a strongly chaotic space is introduced, and its relations to chaotic, rigid and strongly rigid spaces are studied. Some sufficient as well as necessary conditions are shown for a dendrite to be strongly chaotic.
Źródło:
Colloquium Mathematicum; 1996, 70, 2; 181-190
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and adaptive control of a novel 3-D conservative no-equilibrium chaotic system
Autorzy:
Vaidyanathan, S.
Volos, C.
Powiązania:
https://bibliotekanauki.pl/articles/229285.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chaos
chaotic system
conservative chaotic system
adaptive control
synchronization
Opis:
First, this paper announces a seven-term novel 3-D conservative chaotic system with four quadratic nonlinearities. The conservative chaotic systems are characterized by the important property that they are volume conserving. The phase portraits of the novel conservative chaotic system are displayed and the mathematical properties are discussed. An important property of the proposed novel chaotic system is that it has no equilibrium point. Hence, it displays hidden chaotic attractors. The Lyapunov exponents of the novel conservative chaotic system are obtained as L1 = 0.0395, L2 = 0 and L3 = −0.0395. The Kaplan-Yorke dimension of the novel conservative chaotic system is DKY =3. Next, an adaptive controller is designed to globally stabilize the novel conservative chaotic system with unknown parameters. Moreover, an adaptive controller is also designed to achieve global chaos synchronization of the identical conservative chaotic systems with unknown parameters. MATLAB simulations have been depicted to illustrate the phase portraits of the novel conservative chaotic system and also the adaptive control results.
Źródło:
Archives of Control Sciences; 2015, 25, 3; 333-353
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Mobile Robot Workspace Coverage Enhancement
Autorzy:
Fahmy, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/384684.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
chaos
mobile robot
chaotic motion
chaotic mobile robot
Chua's circuit
Opis:
The chaotic mobile robot implies a mobile robot with a controller that ensures chaotic motions. Chaotic motion is characterized by the topological transitivity and the sensitive dependence on initial conditions. Due to the topological transitivity, the chaotic mobile robot is guaranteed to scan the whole connected workspace. The Chua's circuit, which is low cost and easy to construct for trajectory generators, exhibits a rich variety of bifurcation and chaotic behaviors. This particular circuit is analyzed. It is shown how to generate a sequence of chaotic behaviors by varying the value of a linear resistor of the Chua's circuit. According to the simulation, with best adjusting parameters, and mapping the appropriate chaotic variables to robot's kinematic variables, the chaotic behavior is enhanced in the sense of wide area coverage and evenness index.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 33-38
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel 3-D jerk chaotic system with three quadratic nonlinearities and its adaptive control
Autorzy:
Vaidyanathan, S.
Powiązania:
https://bibliotekanauki.pl/articles/229836.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dissipative chaotic system
chaos
chaotic system
adaptive control
backstepping control
synchronization
Opis:
This paper announces an eight-term novel 3-D jerk chaotic system with three quadratic nonlinearities. The phase portraits of the novel jerk chaotic system are displayed and the qualitative properties of the jerk system are described. The novel jerk chaotic system has two equilibrium points, which are saddle-foci and unstable. The Lyapunov exponents of the novel jerk chaotic system are obtained as L1 = 0.20572, L2 = 0 and L3 = −1.20824. Since the sum of the Lyapunov exponents of the jerk chaotic system is negative, we conclude that the chaotic system is dissipative. The Kaplan-Yorke dimension of the novel jerk chaotic system is derived as DKY = 2.17026. Next, an adaptive controller is designed via backstepping control method to globally stabilize the novel jerk chaotic system with unknown parameters. Moreover, an adaptive controller is also designed via backstepping control method to achieve global chaos synchronization of the identical jerk chaotic systems with unknown parameters. The backstepping control method is a recursive procedure that links the choice of a Lyapunov function with the design of a controller and guarantees global asymptotic stability of strict feedback systems. MATLAB simulations have been depicted to illustrate the phase portraits of the novel jerk chaotic system and also the adaptive backstepping control results.
Źródło:
Archives of Control Sciences; 2016, 26, 1; 19-47
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of the chaotic mobile robot for the complex missions
Autorzy:
Fahmy, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/384403.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
chaos
chaotic motion
chaotic mobile robot
Chua's circuit
Arnold and Lorenz equations
Opis:
Mobile robotics, after decades of continuous development, keeps up as an intensive research issue because of its ever- increasing application to different domains and its economical and technological relevance. Interesting applications can be seen in robots performing floor-cleaning tasks, executing industrial transportation, exploring volcanoes, scanning areas to find explosive devices, and so on. a chaotic signal for an autonomous mobile robot is to increase and to take advantage of coverage areas resulting from its travelling paths. The chaotic behavior of the mobile robot is achieved by adding nonlinear equations into the robot kinematic equations, like Arnold, Lorenz, and Chua’s equations, that are well known equations for had a chaotic behavior. The performance of the three guiding signals for robotics system is evaluated in the sense of the wide area coverage, the evenness index, and the total trajectory distance.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 2; 8-12
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined modified function projective synchronization of different systems through adaptive control
Autorzy:
Almohammadi, N. A.
Alzahrani, E. O.
El-Dessoky, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/229808.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Modified Function Projective Synchronization
Novel Chaotic System
Four-Scroll Chaotic System
adaptive control
Opis:
This work describes a new study to achieve a combination of modified function projective synchronization between three different chaotic systems through adaptive control. Using the Lyapunov function theory, the asymptotic stability of the error dynamics is obtained and discussed. Further, we set some appropriate initial conditions for the state variables and assigning specific values to the parameters and obtain the graphical results, which shows the efficiencies of the new method. Finally, we summarized our work with conclusion and references.
Źródło:
Archives of Control Sciences; 2019, 29, 1; 133-146
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Construction Methods and Performance Analysis of WINDMI Chaotic System
Autorzy:
Salih, Thair A.
Powiązania:
https://bibliotekanauki.pl/articles/2055254.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chaotic signals
fpaa
bifurcation
psd
correlation
Opis:
Chaos is an active topic of study in the field of secure communication systems that have garnered much consideration in recent years because of excessive sensitivity to a simple change in its initial conditions. In this paper, the essential features of the suggested WINDMI chaotic system like the phase portraits of the attractors, bifurcation, PSD, correlation, and balance property of the windmi chaotic system have been depicted in detail through MATLAB tools simulations and circuital application. The bifurcation examination detects a wealthy and attractive characteristic of the proposed windmi chaotic oscillator such as periodical multiple bifurcations, has two stable states chaotic demeanor, periodical windows, and recapture bifurcations. In this paper, after exploring the dynamic features of the windmi chaos paradigm, a practical chaotic circuit is implemented on the fpaa chip. Eventually, the circuit practical results of the windmi chaotic attractors present similarities with numerical simulations. The importance of the work is reflected in the use of field programmable analog array in the implementation of the windmi oscillator, and the possibility of varying the initial condition during the operation of the system. An unlimited number of signals can be generated, which enables it to be used as an oscillator utilized in many transceiver systems, that utilized an unlimited number of signals.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 129--136
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of block ciphers: new possibilities
Autorzy:
Kotulski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/747866.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
block ciphers, symmetric cryptography, chaotic systems,
Opis:
Artykuł pokazuje nowe konstrukcje kodów blokowych.
The paper is an explication of how to construct block ciphers in a completely new way. The paper can be divided into three parts. In the first part the foundations of the construction of block ciphers and their security are given. In the second part the foundations and properties of chaotic systems are given. In the third part there are some considerations about using the chaotic systems to construct block ciphers. Applying the chaotic systems in symmetric cryptography is very original and a completely new idea. Chaotic systems have a lot of properties similar to the requirements for block ciphers. The main problem to solve is digitizing chaotic systems (which are continuous) to use them in a discrete application such as block ciphers. Much more consideration and investigation of this matter are needed; however, the idea is very interesting and promising.
Źródło:
Mathematica Applicanda; 2003, 31, 45/04
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new 4-D dynamical system exhibiting chaos with a line of rest points, its synchronizationand circuit model
Autorzy:
Vaidyanathan, Sundarapandian
Sambas, Aceng
Zhang, Sen
Powiązania:
https://bibliotekanauki.pl/articles/229283.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chaos
chaotic systems
circuit design
synchronization
Opis:
A new 4-D dynamical system exhibiting chaos is introduced in this work. The proposed nonlinear plant with chaos has an unstable rest point and a line of rest points. Thus, the new nonlinear plant exhibits hidden attractors. A detailed dynamic analysis of the new nonlinear plant using bifurcation diagrams is described. Synchronization result of the new nonlinear plant with itself is achieved using Integral Sliding Mode Control (ISMC). Finally, a circuit modelusing MultiSim of the new 4-D nonlinear plant with chaos is carried out for practical use.
Źródło:
Archives of Control Sciences; 2019, 29, 3; 485-506
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pipelined architecture of a chaotic pseudo-random number generator in a Cyclone V SoC device
Autorzy:
Dąbal, P.
Pełka, R.
Powiązania:
https://bibliotekanauki.pl/articles/114371.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
chaotic system
random number generators
FPGA
SoC
Opis:
In this paper, we present a novel, optimized microarchitecture of a pseudo-random number generator (PRNG) based on the chaotic model with frequency dependent negative resistances (FDNR). The project was focused on optimization of the PRNG architecture to achieve the highest possible output throughput of the generated pseudo-random sequences. As a result we got a model of the pipelined PRNG that was implemented in Cyclone V SoC from Altera and verified experimentally. All versions of the PRNG were tested by standard statistical tests NIST SP800-22. In addition, we also provide a brief comparison with the PRNG implementation in SoC from Xilinx.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 287-289
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Least Significant Bit Steganography using Hitzl-Zele Chaotic Map
Autorzy:
Kordov, K.
Stoyanov, B.
Powiązania:
https://bibliotekanauki.pl/articles/226663.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steganography
steganalysis
chaotic functions
pseudorandom number generator
Opis:
We propose a novel least significant bit steganography algorithm based on a Hitzl-Zele chaotic function. On the first step a pseudorandom generator is constructed for chaotic pixel selection for hiding the secret message. Exact study has been provided on the novel scheme using visual inspection, peak signal-to-noise ratio, and histogram analysis. The experimental data show excellent performance of the novel stego technique.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 4; 417-422
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new three-dimensional chaotic system with a hidden attractor, circuit design and application in wireless mobile robot
Autorzy:
Vaidyanathan, S.
Sambas, A.
Mamat, M.
Sanjaya, M.
Powiązania:
https://bibliotekanauki.pl/articles/229628.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chaos
chaotic systems
hidden attractors
circuit simulation
Opis:
This research work proposes a new three-dimensional chaotic system with a hidden attractor. The proposed chaotic system consists of only two quadratic nonlinearities and the system possesses no critical points. The phase portraits and basic qualitative properties of the new chaotic system such as Lyapunov exponents and Lyapunov dimension have been described in detail. Finally, we give some engineering applications of the new chaotic system like circuit simulation and control of wireless mobile robot.
Źródło:
Archives of Control Sciences; 2017, 27, 4; 541-554
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying chaotic imperialist competitive algorithm for multi-level image thresholding based on Kapurs entropy
Autorzy:
Nejad, M. R
Fartash, M.
Powiązania:
https://bibliotekanauki.pl/articles/102498.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
segmentation
thresholding
histogram
imperialist competitive algorithm
chaotic
Opis:
Segmentation is one of the most important operations in image processing and computer vision. Normally, all image processing and computer vision applications are related to segmentation as a pre-processing phase. Image thresholding is one of the most useful methods for image segmentation. Various methods have been represented for image thresholding. One method is Kapur thresholding, which is based on maximizing entropy criterion. In this study, a new meta-heuristic algorithm based on imperialist competition algorithm was proposed for multi-level thresholding based on Kapur's entropy. Also, imperialist competitive algorithm is combined with chaotic functions to enhance search potency in problem space. The results of the proposed method have been compared with particle optimization algorithm and genetic algorithm. The findings revealed that the proposed method was superior to other methods.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 29; 125-131
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital watermarking scheme based on curvelet transform and multiple chaotic maps
Autorzy:
Xiao, Yi
Xu, Ya-Chen
Zhou, Nan-Run
Lin, Zhen-Rong
Powiązania:
https://bibliotekanauki.pl/articles/27310097.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital watermarking
curvelet transform
multiple chaotic map
Opis:
The rapid development of digital products brings security issues. Digital watermarking technology is an important means to handle these problems. To enhance the imperceptibility of watermark and locate the possible tampering as well, a digital watermarking scheme based on curvelet transform is presented by combining with multiple chaotic maps. The host image is decomposed into three parts, i.e., coarse layer, detail layer and fine layer, with curvelet transform, and a robust watermark is embedded into the coarse layer for copyright protection of digital products. In addition, an authentication watermark is embedded into the fine layer to detect and locate the illegal changes. Simulation results show that the proposed digital watermarking scheme possesses acceptable robustness and security.
Źródło:
Optica Applicata; 2023, 53, 2; 291--305
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-synchronization in different new chaotic systems via active nonlinear control
Autorzy:
Khan, A.
Prasad, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/229711.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
new chaotic system
anti-synchronization
active nonlinear control
Opis:
In this paper, we discuss anti-synchronization between two identical new chaotic systems and anti-synchronization between another two identical new chaotic systems by active nonlinear control. The sufficient conditions for achieving the anti-synchronization of two new chaotic systems are derived based on Lyapunov stability theory. Numerical simulations are provided for illustration and verification of the proposed method.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 229-242
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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