nowadays in trade and economic issues, prediction is proposed as the most important branch of science. existence of effective variables, caused various sectors of the economic and business executives to prefer having mechanisms which can be used in their decisions. in recent years, several advances have led to various challenges in the science of forecasting. economical managers in various fi...

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because of having many attractions, Mellat park in holly Mashhad is a major tourist site therefore, the study of its recreational value could be effective to Estimate the deficiencies, needs and tourism development in this park. The study was carried out to determine the leisure value of Mellat Park in holy Mashhad, and to estimate the amount of visitors willing to pay the park using contingent...

Today’s situation in cities requires that planned parks be set up to create ecological equilibrium. The current study was  aimed to identify suitable zones for establishing ecoparks in the central region of Isfahan province; this was done using seven effective criteria including topography, landscape, climate, rock and soil, water resources, environmental sensitivity, and accessibility. The wei...

abstract: in this thesis, we focus to class of convex optimization problem whose objective function is given as a linear function and a convex function of a linear transformation of the decision variables and whose feasible region is a polytope. we show that there exists an optimal solution to this class of problems on a face of the constraint polytope of feasible region. based on this, we dev...