looking back into the past shows that iran has always been faced with water shortages, and this has not been a problem confined to a certain period or generation. therefore, proper attention to optimal use of water resources and a move towards sustainable use of extant water resources is indispensable. in this study, using multi period mathematical programming model, the effects of the two goal...

The basic financial purpose of an enterprise is maximization of its value. Trade credit management should also contribute to the realization of this fundamental aim. Many of the current asset management models that are found in the financial management literature assume book profit maximization as the basic financial purpose. These book profit-based models could be lacking in what relates to an...

The basic financial purpose of an enterprise is maximization of its value. Trade credit management should also contribute to realization of this fundamental aim. Many of the current asset management models that are found in financial management literature assume book profit maximization as the basic financial purpose. These book profitbased models could be lacking in what relates to another aim...

the aim of this study is to introduce a parametric mixture model to analysis the competing-risks data with two types of failure. in mixture context, i t h type of failure is i th component. the baseline failure time for the first and second types of failure are modeled as proportional hazard models according to weibull and gompertz distributions, respectively. the covariates affect on both the ...

projects scheduling by the project portfolio selection, something that has its own complexity and its flexibility, can create different composition of the project portfolio. an integer programming model is formulated for the project portfolio selection and scheduling.two heuristic algorithms, genetic algorithm (ga) and simulated annealing (sa), are presented to solve the problem. results of cal...

Projects scheduling by the project portfolio selection, something that has its own complexity and its flexibility, can create different composition of the project portfolio. An integer programming model is formulated for the project portfolio selection and scheduling.Two heuristic algorithms, genetic algorithm (GA) and simulated annealing (SA), are presented to solve the problem. Results of cal...