![]() Numerical simulations were performed to evaluate the security of the image encryption algorithm in terms of histogram, information entropy, differential attack test, etc. Furthermore, based on the hyperchaotic system, a pseudorandom number generator (PRNG) with desirable statistical characteristics is designed for image encryption. To assess the practicability and effectiveness of the method, we construct a 6-dimensional non-degenerate hyperchaotic system as an example. ![]() To combat this issue, we proposed a universal method that is based on singular value decomposition (SVD), which can reversely construct non-degenerate hyperchaotic systems with any desired number of positive Lyapunov exponents by controlling pre-specified singular values. ![]() It has been demonstrated that such a transition should use smooth attenuation of the modulation signal to ensure the desired “nominal” operation of the system.ĭue to the limited machine word length of hardware devices, the dynamics of digital chaotic systems will degenerate. Additionally, we propose an implementation of the adaptive control with the objective to drive the system away from a “nonnominal” mode. ![]() As an alternative, a modified modulation in the form of the absolute value of the sine wave has been studied the latter is characterized by a simpler bifurcation structure. The result is formulated in terms of the acceptable amplitude of the modulation while the effect of phase shift is taken into account. The effect of utilizing sinusoidal modulation has been studied employing brute-force bifurcation diagrams as well as those obtained by numerical continuation, symbolic analysis of periodic modes, and normal form approximation of border-collision bifurcation. We deal with the model of a multistable chopper-fed DC electric drive and study the control of multistability by the periodic modulation of a PWM (pulse-width modulation) carrier signal. Multistability is a universal nonlinear feature for many areas of physics and technology for most applications, it is an undesired feature leading to uncertainty of the system’s functioning, and therefore, it should be controlled. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |