نتایج جستجو برای: hub covering problem
تعداد نتایج: 938083 فیلتر نتایج به سال:
In this paper we present the problem of designing a three level hub center network. In our network, the top level consists of a complete network where a direct link is between all central hubs. The second and third levels consist of star networks that connect the hubs to central hubs and the demand nodes to hubs and thus to central hubs, respectively. We model this problem in an incomplete net...
Set covering problem has many applications such as emergency systems, retailers’ facilities, hospitals, radar devices, and military logistics, and it is considered as Np-Hard problems. The goal of set covering problem is to find a subset such that :::::::::union::::::::: of the subset members covered the whole set. In this paper, we present a new heuristic algorithm to solve the set covering pr...
Iran’s geographical situation, in particular long-distance routes, makes rail transportation to be more attractive and important than the other modes. Since transport cost is the main concern for local and national authorities, Hub location is an important problem in transport planning in which transport industries are looking for selected points to change trains for passengers. In this pap...
The increasing demand for multimodal freight transportation makes the expansion of new secondary hubs necessary. carbon tax has also received attention from various sectors due to development requirements green transportation. Therefore, this study proposed a transport hub location problem, where emissions are specifically considered achieve strategic planning. A mixed integer non-linear progra...
In this paper, we introduce a new hub-and-spoke structure for service networks based on round-trips as practiced by some transport providers. This problem is variant of Uncapacitated Hub Location Problem wherein the spoke nodes allocated to hub node form (cycles) starting from and ending node. motivated two real-life practices in logistics runaway connections with their associated economies sca...
We investigate a variant of the many-to-many hub location-routing problem which consists in partitioning the set of nodes of a graph into routes containing exactly one hub each, and determining an extra route interconnecting all hubs. A variable neighborhood descent with neighborhood structures based on remove/add, swap and exchange moves nested with routing and location operations is used as a...
Hubs are special facilities that serve as switching, transshipment and sorting points in many-to-many distribution systems. The hub location problem is concerned with locating hub facilities and allocating demand nodes to hubs in order to route the traffic between origin–destination pairs. In this paper we classify and survey network hub location models. We also include some recent trends on hu...
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