A remarkably simple electronic circuit design based on the chaotic Lorenz system is described. The circuit consists of just two active nonlinear elements (high-speed analog multipliers) and a few passive linear elements. Experimental implementations of the circuit exhibit the classic butterfly attractor and the hysteretic transition from steady state to chaos observed in the Lorenz equations. T...

In this paper, we proposed two new frequency synchronization methods for orthogonal frequency division multiplexing (OFDM) system. They have large estimation range and acceptability precision in Rayleigh channel. One of the methods will not waste the system bandwidth because the training sequence is superimposed on the data of OFDM symbol. The performance of the two methods is better than that ...

This paper addresses a newly discovered security threat named Frequency of Occurrence Analysis (FOA) attack in searchmetics password authentication scheme. A countermeasure technique that utilises Metaheuristic Randomisation Algorithm (MRA) is proposed to address the FOA attack. The proposed Algorithm is presented and an offline FOA attack simulation tool is developed to verify the effectivenes...

BACKGROUND frequency compression. AIM to evaluate the index of speech recognition (IPRF) using frequency compression in three different ratios. METHODS monosyllabic words were recorded using an algorithm of frequency compression in three ratios: 1:1, 2:1, 3:1, generating three lists of words. Eighteen listeners accomplished the IPRF using the modified words. They were subdivided in two grou...

INTRODUCTION Up to 30% of women suffer from female orgasmic disorder (FOD)-the second most common type of female sexual dysfunction. FOD has been acknowledged to be multifactorial and recent research has implicated the importance of psychosocial risk factors. AIM The aim of this study is to investigate whether normal variations in emotional intelligence--the ability to identify and manage emo...