Islamic Azad University at Sepidan

www.iausepidan.ac.ir
Parsabad, Iran
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Zolfpour-Arokhlo M.,Islamic Azad University at Sepidan | Selamat A.,University of Technology Malaysia | Mohd Hashim S.Z.,University of Technology Malaysia | Afkhami H.,Islamic Azad University at Sepidan
Engineering Applications of Artificial Intelligence | Year: 2014

In this paper, a new model for a route planning system based on multi-agent reinforcement learning (MARL) algorithms is proposed. The combined Q-value based dynamic programming (QVDP) with Boltzmann distribution was used to solve vehicle delay's problems by studying the weights of various components in road network environments such as weather, traffic, road safety, and fuel capacity to create a priority route plan for vehicles. The important part of the study was to use a multi-agent system (MAS) with learning abilities which in order to make decisions about routing vehicles between Malaysia's cities. The evaluation was done using a number of case studies that focused on road networks in Malaysia. The results of these experiments indicated that the travel durations for the case studies predicted by existing approaches were between 0.00 and 12.33% off from the actual travel times by the proposed method. From the experiments, the results illustrate that the proposed approach is a unique contribution to the field of computational intelligence in the route planning system. © 2014 Elsevier Ltd. All rights reserved.


Saadat H.,Islamic Azad University at Sepidan
International Journal of Theoretical Physics | Year: 2013

In this paper we study viscous generalized Chaplygin gas and obtain modified Friedmann equations due to viscosity. In the case of non-flat universe we calculate time-dependent energy density of generalized Chaplygin gas. By using stability condition and speed of sound we find critical value of viscosity coefficient where speed of sound is finite. © 2013 Springer Science+Business Media New York.


Saadat H.,Islamic Azad University at Sepidan | Pourhassan B.,Islamic Azad University at Sepidan
Astrophysics and Space Science | Year: 2013

In this paper we study FRW bulk viscous cosmology in presence of modified cosmic Chaplygin gas. We obtain generalized Friedmann equations due to bulk viscosity and modified cosmic Chaplygin gas. Then, we calculate time-dependent energy density and discuss Hubble expansion parameter. © 2012 Springer Science+Business Media Dordrecht.


Saadat H.,Islamic Azad University at Sepidan | Pourhassan B.,Islamic Azad University at Sepidan
Astrophysics and Space Science | Year: 2013

In this paper we study FRW bulk viscous cosmology in presence of modified Chaplygin gas. We write modified Friedmann equations due to bulk viscosity and Chaplygin gas and obtain time-dependent energy density for the special case of flat space. © 2012 Springer Science+Business Media Dordrecht.


Saadat H.,Islamic Azad University at Sepidan
International Journal of Theoretical Physics | Year: 2013

In this paper the equation of state formalism for the dark energy models on the brane considered and stability of theory investigated. We consider four different cases of the Little Rip, Asymptotic de Sitter, Asymptotic breakdown, and Big Freeze singularity models and find that the only stable model is Asymptotic de Sitter case. In other cases we get negative value of squared sound speed. © 2013 Springer Science+Business Media New York.


Saadat H.,Islamic Azad University at Sepidan | Farahani H.,Islamic Azad University at Sepidan
International Journal of Theoretical Physics | Year: 2013

In this work we study viscous Chaplygin gas and obtain modified Friedmann equations due to viscosity. We calculate time-dependent energy density for the case of non-flat universe. By using stability condition and speed of sound we find critical value of viscosity coefficient where speed of sound is finite. © 2012 Springer Science+Business Media New York.


Saadat H.,Islamic Azad University at Sepidan | Pourhassan B.,Islamic Azad University at Sepidan
International Journal of Theoretical Physics | Year: 2013

In this study we consider STU model as dual picture of superfluid. By using AdS/CFT correspondence we obtain sound modes as a function of black hole charge and temperature. We find that the second sound has linear behavior with charge and fourth sound yields to one by increasing black hole charge. © 2012 Springer Science+Business Media New York.


Saadat H.,Islamic Azad University at Sepidan
International Journal of Theoretical Physics | Year: 2013

In this paper, we study holographic Ricci dark energy model with non-constant c2 term in dark energy density formula. We consider FRW metric in flat space-time and calculate density. Also we find scale factor and Hubble expansion parameter. © 2012 Springer Science+Business Media New York.


Ranjbarsahraei B.,Islamic Azad University at Science and Research of Fars | Roopaei M.,Islamic Azad University at Science and Research of Fars | Khosravi S.,Islamic Azad University at Sepidan
Nonlinear Dynamics | Year: 2012

In this paper, an adaptive fuzzy robust H ∞ controller is proposed for formation control of a swarm of differential driven vehicles with nonholonomic dynamic models. Artificial potential functions are used to design the formation control input for kinematic model of the robots and matrix manipulations are used to transform the nonholonomic model of each differentially driven vehicle into equivalent holonomic one. The main advantage of the proposed controller is the robustness to input nonlinearity, external disturbances, model uncertainties, and measurement noises, in a formation control of a nonholonomic robotic swarm. Moreover, robust stability proof is given using Lyapunov functions. Finally, simulation results are demonstrated for a swarm formation problem of a group of six unicycles, illustrating the effective attenuation of approximation error and external disturbances, even in the case of robot failure. © 2011 Springer Science+Business Media B.V.


Khosravi S.,Islamic Azad University at Sepidan | Jahangir M.,Islamic Azad University at Sepidan | Afkhami H.,Islamic Azad University at Sepidan
Nonlinear Dynamics | Year: 2012

In this paper, a multi-robot formation control is designed based on SlidingMode Control (SMC) technique. Although the structure and sensing capabilities of each robot are very simple, complex formation behaviors emerge from cooperation among them. We use an adaptive fuzzy approximator, in which unknown dynamic of robots and time delays are approximated precisely. Then it is shown that autonomous robots are able to form geometrical formations, even in the case of time-delayed dynamics, and presence of obstacles. Various simulation results and comparisons with existing works are provided that demonstrate performing efficient formation of unknown robots, with robust characteristics. © Springer Science+Business Media B.V. 2012.

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