This paper presents a bi-objective capacitated hub arc location problem with single assignment for designing a metro network with an elastic demand. In the literature, it is widely supposed that the network created with the hub nodes is complete. In this paper, this assumption is relaxed. Moreover, in most hub location problems, the demand is assumed to be static and independent of the location...

This paper is devoted to the recent findings in analytical research of supply-demand allocation a single-commodity network with distant (in space) suppliers and consumers. The problem formulated as an equilibrium flow assignment affine functions demand, supply, logistic costs represented by digraph consumers located nodes. We offer brief overview relocation patterns obtained for elastic, shorta...

Establishing a network of transit routes with satisfactory demand coverage is one of the main goals of transitagencies in moving towards a sustainable urban development. A primary concern in obtaining such anetwork is reducing operational costs. This paper deals with the problem of minimizing construction costsin a grid transportation network while satisfying a certain level o...

In many application areas engineering, communications, logistics, manufacturing, transportation, different non-homogeneous commodities are distributed over the same underlying network. Usually the separate commodities share common arc capacities that restrict the integrated flow of the gross commodities on the arc. Furthermore, there exists a mutual interaction between the commodities. The ge...

U.S. food prices rose 4% in 2007 and are expected to gain 3.5% to 4.5% in 2008. Higher farm commodity prices and energy costs are the leading factors behind higher food prices. Farm commodity prices have surged because (1) demand for corn for ethanol is competing with food and feed for acreage; (2) global food grain and oilseed supplies are low due to poor harvests; (3) the weak dollar has incr...

Nowadays, supply chain management (SCM) is an interesting problem that has attracted the attention of many researchers. Transportation network design is one of the most important fields of SCM. In this paper, a logistics network design is considered to optimize the total cost and increase the network stability and resiliency. First, a mixed integer nonlinear programming model (MINLP) is formula...

We describe a two-stage robust optimization approach for solving network flow and design problems with uncertain demand. In two-stage network optimization one defers a subset of the flow decisions until after the realization of the uncertain demand. Availability of such a recourse action allows one to come up with less conservative solutions compared to single-stage optimization. However, this ...

This paper is focused on the tactical design of steel supply chain (SSC). A general mathematical model is proposed to integrate production and transportation planning in multi-commodity SSC. The main purpose is to prepare a countrywide production and distribution plan in an SSC with three layers consisting of iron ore mines as suppliers, steel companies as producers, and subsidiary steel compan...

By exploring of the multi-stage network design problem of comprehensive traffic, the paper proposes a bi-level programming model with uncertain demand. The upper level problem is to maximize the consumer surplus of all demand scenarios with budget constraint. While under the network investment decisions of the upper level problem, the lower level problem is to maximize the consumer surplus of e...