In this paper we propose a 4-index formulation for the uncapacitated multiple allocation hub location problem tailored for urban transport and liner shipping network design. This formulation is very tight and most of the tractable instances for MIP solvers are optimally solvable at the root node. While the existing state-of-the-art MIP solvers fail to solve even small size instances of problem,...

Abstract. In this paper, we introduce the Tree of Hubs Location Problem with Upgrading, a mixture of the Tree of Hubs Location Problem, presented in [15], and the Minimum Cost Spanning Tree Problem with Upgraded nodes, studied for the first time in [19]. In addition to locate the hubs, to determine the tree that connects the hubs and to allocate non-hub nodes to hubs, a decision has to be made ...

Wind energy has emerged as an important field of study in today's era. A fundamental aspect of this study is the efficient design of wind farms. This design process considers a number of conflicting design criteria. Therefore, a solution is desired that provides the best balance between all design criteria. In this paper, an automated decision-making approach based fuzzy logic is proposed to ad...

Hubs act as intermediate points for the transfer of materials in transportation system. In this study, a novel p-mobile hub location–allocation problem is developed. Hub facilities can be transferred to other hubs next period. Implementation mobile reduce costs opening and closing hubs, particularly an environment with rapidly changing demands. On hand, movement reduces lifespan adds relevant c...

The hub location problem with single assignment is the problem of locating hubs and assigning the terminal nodes to hubs in order to minimize the cost of hub installation and the cost of routing the traffic in the network. There may also be capacity restrictions on the amount of traffic that can transit by hubs. The aim of this paper is to investigate polyhedral properties of these problems and...

Over the last decade or so, multinational enterprises (MNEs) have shifted from centralised hub structures to multi-hub structures. While these new structures provide greater potential for crossfertilization of technologies and access to location-specific competences, promoting effective knowledge transfer within an MNE – especially in their R&D activities presents significant managerial challen...

This study proposes a multi-period facility location formulation to maximize coverage while meeting reliability constraint. The constraint is chance limiting the probability of failure maintain desired service standard, commonly followed by emergency medical services and fire departments. Further, uncertainties in probabilities are incorporated utilizing robust optimization using polyhedral unc...

Waste clean-up after a disaster is one of the most critical tasks in response stage management. We develop model to minimise cost and duration waste considering using Temporary Disaster Management Sites (TDWMSs), which can store process before it sent final disposal sites. The problem that arises be seen as Multi-Period Two-echelon Location Routing Problem (MP-2ELRP) main decisions are location...