the purpose of this study is to investigate comparative advantages of corn in comparison with other competitor crops. to do so, linear programming, to 2004-2005 data related to classic index (drc) in kermanshah province was applied. results showed that corn has comparative advantages in all regions of kermanshah province while in optimal cultivation pattern of 37.5 percentages of regions in exi...

We survey a new approach that the author and his co-workers have developed to formulate stochastic control problems (predominantly queueing systems) as mathematical programming problems. The central idea is to characterize the region of achievable performance in a stochastic control problem, i.e., find linear or nonlinear constraints on the performance vectors that all policies satisfy. We pres...