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The focus of this book is on finding the unconstrained minimizer of a function. Specifically, we will focus on the Barzilai and Borwein (BB) method that is a famous two-point stepsize gradient method. Due to BB methods simplicity, low storage and numerical efficiency, the BB method has received a good deal of attention in the optimization community but despite all these advances, stepsize of BB method is computed by means of simple approximation of Hessian in the form of scalar multiple of identity and especially the BB method is not monotone, and it is not easy to generalize the method to...

In this work, the relations between data envelopment analysis and queuing models are proposed. Via our new approach, some drawbacks of the previously methods for large scale computer networks are rectified. Meanwhile the proposed method is also defined for fuzzy queuing models. The major goal of our new aspect is the relation between DEA and queuing system which has been rarely noticed by researchers. Also, we want to show that how DEA can increase the overall efficiency in any system. Our main aim is the capability and the usage of DEA even in queuing system. The objectives of the work are...