The cost and schedule required to design and develop modern computer based systems has grown dramatically over the past decade. Advanced system engineering development methods and automation techniques are required to manage the complexity inherent in the design of large complex computer based systems to provide an efficient means for evaluating various requirements options. OML is an approach,...

data envelopment analysis (dea) is a wide range of mathematical models that used for measuring the relative efficiency of a set of harmonic units whit similar inputs and outputs. this model calculates some different weight for input and output variables in each decision making model. this variation in similar weights caused some critiques to this method. from 1991 some linear and nonlinear mode...

Long-term strategic investment decisions are associated with high costs and risks. The decision-makers need a solid foundation to judge the best alternative for an project. In every sector of business, taken. natural gas industry in Germany has made considerable expenditures infrastructure will continue future. A part goes into compressor capacity. To avoid misallocation funds optimal compresso...