Yazar "Jafari, Sajad" için listeleme
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CHAOTIC CUTTLESH: KING OF CAMOUAGE WITH SELF-EXCITED AND HIDDEN FLOWS, ITS FRACTIONAL-ORDER FORM AND COMMUNICATION DESIGNS WITH FRACTIONAL FORM
Rajagopal, Karthikeyan; Çiçek, Serdar; Akgül, Akif; Jafari, Sajad; Karthikeyan, Anitha (Amer Inst Mathematical Sciences-Aims, 2020)There are many works on self-excited and hidden attractors. However the relationship between them is less investigated. In this study we present a system which can have both hidden self-excited attractors. Dynamical ... -
Complete analysis and engineering applications of a megastable nonlinear oscillator
Jahanshahi, Hadi; Rajagopal, Karthikeyan; Akgül, Akif; Sarı, Naeimeh Najafizadeh; Namazi, Hamidreza; Jafari, Sajad (Pergamon-Elsevier Science Ltd, 2018)In this paper, we investigate some unrevealed features of a newly introduced megastable chaotic oscillator. This oscillator has a rich dynamical behavior including limit cycle, torus and strange attractor. Also it has ... -
An exponential jerk system, its fractional-order form with dynamical analysis and engineering application
Rajagopal, Karthikeyan; Akgül, Akif; Jafari, Sajad; Karthikeyan, Anitha; Çavuşoğlu, Ünal; Kaçar, Sezgin (Springer, 2020)A simple jerk system with only one exponential nonlinearity is proposed and discussed. Dynamic analysis of the integer-order jerk system shows the existence of chaotic oscillations. A model for the fractional-order jerk ... -
An Exponential Jerk System: Circuit Realization, Fractional Order and Time Delayed Form with Dynamical Analysis and Its Engineering Application
Rajagopal, Karthikeyan; Akgül, Akif; Jafari, Sajad; Karthikeyan, Anitha; Çavuşoğlu, Ünal; Kaçar, Sezgin (World Scientific Publ Co Pte Ltd, 2019)Simple dynamical systems are of interest always. In this paper, we propose a simple jerk system with one exponential nonlinearity. Dynamical properties of the proposed system are investigated. To show the practical ... -
A family of circulant megastable chaotic oscillators, its application for the detection of a feeble signal and PID controller for time-delay systems by using chaotic SCA algorithm
Rajagopal, Karthikeyan; Çimen, Murat Erhan; Jafari, Sajad; Singh, Jay Prakash; Roy, Binoy Krishna; Akmeşe, Ömer Faruk; Akgül, Akif (Pergamon-Elsevier Science Ltd, 2021)Chaotic systems with cyclic symmetry are very rare and have been less discussed in the literature. Similarly, megastable oscillators, which can have a finite or infinite number of coexisting attractors, have also attracted ... -
Fractional Order Simple Chaotic Oscillator with Saturable Reactors and Its Engineering Applications
Rajagopal, Karthikeyan; Jafari, Sajad; Kaçar, Sezgin; Karthikeyan, Anitha; Akgül, Akif (Kaunas Univ Technology, 2019)Chaos is often observed in forced nonlinear electrical circuits with saturable reactors. Simplest of such a circuit is presented and investigated in both integer order and non-integer (fractional) order form. For numerical ... -
Multiscroll chaotic system with sigmoid nonlinearity and its fractional order form with synchronization application
Rajagopal, Karthikeyan; Durdu, Ali; Jafari, Sajad; Uyaroğlu, Yılmaz; Karthikeyan, Anitha; Akgül, Akif (Pergamon-Elsevier Science Ltd, 2019)In this paper, a multiscroll snap oscillator with hyperbolic tangent function is proposed. There is no limitation in the number of scrolls and it can be increased by proper choice of a specific function. The Lyapunov ... -
Multistability and Coexisting Attractors in a New Circulant Chaotic System
Rajagopal, Karthikeyan; Akgül, Akif; Viet-Thanh Pham; Alsaadi, Fawaz E.; Nazarimehr, Fahimeh; Alsaadi, Fuad E.; Jafari, Sajad (World Scientific Publ Co Pte Ltd, 2019)In this paper, a new four-dimensional chaotic flow is proposed. The system has a cyclic symmetry in its structure and shows a complicated, chaotic attractor. The dynamical properties of the system are investigated. The ... -
S-Box Based Image Encryption Application Using a Chaotic System without Equilibrium
Wang, Xiong; Çavuşoğlu, Ünal; Kaçar, Sezgin; Akgül, Akif; Viet-Thanh Pham; Jafari, Sajad; Xuan Quynh Nguyen (Mdpi, 2019)Chaotic systems without equilibrium are of interest because they are the systems with hidden attractors. A nonequilibrium system with chaos is introduced in this work. Chaotic behavior of the system is verified by phase ... -
A Simple Chaotic System With Topologically Different Attractors
Rajagopal, Karthikeyan; Akgül, Akif; Moroz, Irene M.; Wei, Zhouchao; Jafari, Sajad; Hussain, Iqtadar (IEEE-Inst Electrical Electronics Engineers Inc, 2019)There have been many different investigations of nonlinear dynamical systems. In this paper, we introduce a new chaotic system. In the proposed system, the attractor can be modified by adding a nonlinear term to the third ...