Consider a market where producers submit supply functions to a procurement auction — e.g. an electric power auction — under uncertainty, before demand has been realized. In the Supply Function Equilibrium (SFE), every firm commits to the supply function maximizing his expected profit given the supply functions of the competitors. The presence of multiple equilibria is one basic weakness of SFE....

Several key economic scenarios involve agents having limited capacities whose types change with time, e.g., service workers attending to service requests, power plants supplying to power grids, and machines connected to computing grids. Dynamic mechanisms have been proposed to address the issue of dynamic types. Also, a few mechanisms have been proposed to account for limited capacities in stat...

Segmentation of femurs in Anterior-Posterior x-ray images is very important for fracture detection, computer-aided surgery and surgical planning. Existing methods do not perform well in segmenting bones in x-ray images due to the presence of large amount of spurious edges. This paper presents an atlas-based approach for automatic segmentation of femurs in x-ray images. A robust global alignment...

As demand for passenger and freight transport on Britain’s railways increases, providing additional capacity and making the best use of the existing infrastructure are priorities for the industry. Since the stations and junctions forming the nodes of the railway network tend to form the constraints on route and network capacity, improved understanding of their operation and capacity characteris...

Dans des systèmes d’abonnements basés sur le contenu, les utilisateurs expriment leurs intérêts par des requêtes sur les flux de publications. Le passage à l’échelle des systèmes d’abonnements pose de nombreux problèmes de performance: les utilisateurs sont intéressés par la fraîcheur des données, c’est à dire, obtenir les résultats de leurs abonnements le plus vite possible, tandis que les fou...