Mohammad Javidi

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BACKGROUND The exposure to noxious agwents such as lead my cause lung disorders. OBJECTIVES In the present study, pulmonary function tests and self-reported respiratory symptoms in lead exposure workers were compared with matched control subjects. MATERIALS AND METHODS The frequency of respiratory symptoms were evaluated in a sample of 108 lead exposure(More)
Today the Genetic Algorithm (GA) is used to solve a large variety of complex nonlinear optimization problems. However, permute convergence which is one of the most important disadvantages in GA is known to increase the number of iterations for reaching a global optimum. This paper, presents a new GA based on chaotic systems to overcome this shortcoming,. We(More)
In this work, we investigate the dynamical behavior of a fractional order cholera model. All the feasible equilibria for the system are obtained and the conditions for the existence of interior equilibrium are determined. Local stability analysis of the cholera model is studied by using the fractional Routh-Hurwitz stability conditions. Our results indicate(More)
In this paper, we investigate the chaotic behaviors of the fractional-order permanent magnet synchronous motor (PMSM) system. The necessary condition for the existence of chaos in the fractional-order PMSM system is deduced and an active controller is developed based on the stability theory for fractional systems. The presented control scheme is simple and(More)
The fractional order Newton–Leipnik (FONL) system can be written as d αx dt = −ax+y+10zy, d αy dt = −x−0.4y+5xz, d αz dt = bz−5xy with a and b being real parameters. In this paper, stability analysis of the FONL system is studied by using the fractional Routh–Hurwitz stability conditions. We have studied the local stability of the equilibrium points of FONL(More)