We first define and experiment the hub-authority core (or HA-core) of a directed network. It depends on two a and h parameters expressing requirements on hub and authority degrees which have to be fulfilled within the core. The definition of these interrelated degrees is inspired by the standard definition of hub and authorities centrality scores (HITS). We investigate the HA-cores on citation ...

This note explores the extent to which airlines operating large hub-and-spoke networks secure a competitive advantage. More speci®cally, this paper explores the intricate relationship which arises among productive eciencies and pro®tability when the size of the hub-and-spoke network expands. To this end, Brueckner and Spiller (1991, International Journal of Industrial Organization 9, 323±342) ...

In this paper we extend the cultural framework previously developed for the Village multi-agent simulation in Swarm to include the emergence of a hub network from two base networks. The first base network is kinship, over which generalized reciprocal exchange is defined, and the second is the economic network where agents carry out balanced reciprocal exchange. Agents, or households, are able t...

In this paper, we propose an extension of the uncapacitated hub location problem where potential positions hubs are not fixed in advance. Instead, they allowed to belong a region around initial discrete set nodes. We give general framework which collection, transportation, and distribution costs based on norm-based distances hub-activation setup depend only that opened but also size placed. Two...

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...