in this study, the stochastic cell formation problem with developing model within queuing theory with stochastic demand, processing time and reliability has been presented. machine as server and part as customer are assumed where servers should service to customers. since, the cell formation problem is np-hard, therefore, deterministic methods need a long time to solve this model. in this study...

The grasshopper algorithm (GOA) is a recent algorithm. It widely used in many applications and results good solution. simple the accuracy very high. GOA has some limitations due to use of linear comfort zone parameter that causes difficulties balancing between exploration exploitation which may lead fall local optimum. In this paper modification made improve operation GOA. A nonlinear function ...

the aim of this study was to estimate suspended sediment by the ann model, dt with cart algorithm and different types of src, in ten stations from the lorestan province of iran. the results showed that the accuracy of ann with levenberg-marquardt back propagation algorithm is more than the two other models, especially in high discharges. comparison of different intervals in models showed that r...