In many logistic systems for less than truckload (LTL) shipments, transportation of goods from one origin to its destination is made through collection tours to a hub and delivery tours from the same or another hub, while the goods are shipped between two hubs using Full Truckload (FTL) shipments. Therefore, managers need to determine the location of the hubs, the allocation of non-hub nodes, a...

This paper deals with a capacitated hub location problem arising in the design of telecommunications networks. The problem is different from the classical hub location problem in two ways: the cost of using an edge is not linear but stepwise and the capacity of a hub restricts the amount of traffic transiting through the hub rather than the incoming traffic. In this paper both an exact and a he...

Parcel delivery is a complex logistic service, as it serves many small or medium-sized customers who may send or receive parcels. Modeling such delivery system needs to integrate two different research areas of hub location and vehicle routing. As it totally depends on the network and the linkage of the nodes, in this paper, some door-to-door service providers are taken into account to provide ...

In this paper, emphasis is put on a case study that deals with a system for distributing heat generated in a centralized location for residential and commercial heating requirements. This idea is integrated in the concept called “Energy Hub,” which is a conceptual cluster of local energy converters and storages. It’s supplied by multiple energy carriers coming from an existing grid or from loca...

the cities of jay in pre-islamic and yahudiya in the post islamic period were located in a plain delimited from three sides by surrounding heights. this area, referred to in historical and geographical documents as the rostāq-i jay, was the most important rural district of isfahan's khora. with rising of buyids, they decided to change the seat of power from jay to yahudiya and consequently...

The usability of hub location models heavily depends on an appropriate modelling approach for the economies of scale. Realistic hub location models require more sophisticated transport cost structures than the traditional α-discount. We develop a general modelling scheme for such problems allowing the definition of complicated (non-linear) costs and constraints; its structure allows an abstract...

In this study a hierarchical hub location problem with two layers is considered. The first layer includes small hubs and the second one includes a star-shaped network central hub. The considered case is a cargo delivery network where there is hierarchy between hubs. All the hubs and links are capacitated and there are three kinds of commodities for each of which there is a special kind of vehic...