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This research investigates a practical bi-objective model for the facility location–allocation (BOFLA) problem with immobile servers and stochastic demand within the M/M/1/K queue system. The first goal of the research is to develop a mathematical model in which customers and service providers are considered as perspectives. The objectives of the developed(More)
In this paper we have developed the traditional inventory control model (r,Q) taking into account a multi-item models with two objectives to minimize holding costs and shortage cost and also risk level under constraints including available budgetary, the least service 210 Mohammad Amin Nayebi et al level, storage spaces & allowed quantities of shortage.(More)
The special problems of robotic gripping in space are identified and enumerated. The mechanical and control aspects of this class of gripper are discussed briefly. It is found that the impact of zero- or microgravity necessitates rethinking of the underlying principles of grasping, manipulating and autochanging of end-effectors. The fundamental differences(More)
In this paper, we study different methods of solving joint redundancy-availability optimization for series-parallel systems with multi-state components. We analyzed various effective factors on system availability in order to determine the optimum number and version of components in each subsystem and consider the effects of improving failure rates of each(More)
In multi-state systems (MSS) reliability problems, it is assumed that the components of each subsystem have different performance rates with certain probabilities. This leads into extensive computational efforts involved in using the commonly employed universal generation function (UGF) and the recursive algorithm to obtain reliability of systems consisting(More)
Reliability models based on Markov chain (Except in queuing systems) have extensive applications in electrical and electronically devices. In this paper we consider a system with n parallel and not necessarily identical elements with increasable failure rates (Failure rates are wiebull distributed) and the elements are non repairable. The system works until(More)
Reliability models based on Markov chain (Except in queuing systems) have extensive applications in electrical and electronically devices. In this paper we consider a system with n parallel and identical repairable elements with constant failure and repair rates (failure and repair rates are exponentially distributed. The failure rates increase when some(More)
Azizollah Memariani g2 Rasool Noorossana h3 Reliability models based on Markov chain (Except in queuing systems) have extensive applications in electrical and electronic devices. Here, we consider a k-out-of-n:G system with n parallel and identical elements with increasing failure rates (failure rates are Weibull distributed) and non repairable elements.(More)