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[en] In the above paper, the authors proposed a search algorithm for finding simple chaotic systems with quadratic nonlinearities which have the unusual feature of having a line equilibrium and introduced nine novel chaotic flows. However, the equations of 4th–9th chaotic flows were incorrectly given. In this letter, the correct equations are presented for the future usage of these line equilibrium chaotic flows

[en] Fractal dimension was demonstrated to be able to characterize the complexity of biological signals. The EMG time series are well known to have a complex behavior and some other studies already tried to characterize these signals by their fractal dimension. This paper is aimed at studying the correlation between the fractal dimension of surface EMG signal recorded over Rectus Femoris muscles during a vertical jump and the height reached in that jump. Healthy subjects performed vertical jumps at different heights. Surface EMG from Rectus Femoris was recorded and the height of each jump was measured by an optoelectronic motion capture system. Fractal dimension of sEMG was computed and the correlation between fractal dimension and eight of the jump was studied. Linear regression analysis showed a very high correlation coefficient between the fractal dimension and the height of the jump for all the subjects. The results of this study show that the fractal dimension is able to characterize the EMG signal and it can be related to the performance of the jump. Fractal dimension is therefore an useful tool for EMG interpretation

[en] In this paper the approximately analytical solution of van der Pol (VDP) oscillator with two kinds of fractional-order derivatives is obtained based on averaging method. Two equivalent system parameters, i.e. equivalent damping coefficient and equivalent stiffness coefficient, are defined, which could characterize the effects of the fractional parameters on the limit cycle in fractional-order VDP oscillator. The same points and differences between the traditional integer-order and fractional-order VDP oscillator are analyzed and summarized in detail. The differences are focused on the convergence speed and frequency characteristic of the limit cycle in VDP oscillator. The comparison between the analytical and numerical solution verifies the correctness and satisfactory precision of the approximately analytical solution. At last, the effects of the fractional parameters on the convergence speed and frequency characteristic of the limit cycle in fractional-order VDP oscillator are illustrated based on some typical system parameters

[en] We investigate the strength and direction of information flow between exchange rates and stock prices in several emerging countries by the novel concept of effective transfer entropy (an alternative non-linear causality measure) with symbolic encoding methodology. Analysis shows that before the 2008 crisis, only low level interaction exists between these two variables and exchange rates dominate stock prices in general. During crisis, strong bidirectional interaction arises. In the post-crisis period, the strong interaction continues to exist and in general stock prices dominate exchange rates