Hubs are critical elements of transportation networks. Location of hubs and allocation of demands to them are of high importance in the network design. The most important purpose of these models is to minimize the cost, but path reliability is also another important factor which can influence the location of hubs. In this paper, we propose a P-center hub location model with full interconnection...

In this paper we consider properties of the central path and the analytic center of the optimal face in the context of parametric linear programming. We rst show that if the right-hand side vector of a standard linear program is perturbed, then the analytic center of the optimal face is one-side di erentiable with respect to the perturbation parameter. In that case we also show that the whole a...

A well-planned robot dispatching platform reduces costs and increases efficiency for companies while also reducing carbon emissions achieving sustainable development. At the moment, solution to difficulty of warehouse logistics is use multiple distribution centers with autonomous mobile robots (AMR). To solve this problem, paper establishes a semi-closed model centers, considering number cycles...

analyzing the path of information and the errors in the information system of hospitals (his) shahid motahri medical education center     nazari h [1] , molavi m [2] *, rashidi a [3] *     received: 23 apr , 2013 accepted: 28 jun , 2013     abstract:   background & aims : today the quality of health service is determined by providing the service by appropriate operators (people), within the sho...