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The Orange " Data for Development " (D4D) challenge is an open data challenge on anonymous call patterns of Orange's mobile phone users in Ivory Coast. The goal of the challenge is to help address society development questions in novel ways by contributing to the socioeconomic development and well-being of the Ivory Coast population. Participants to the(More)
Massive Multiuser Virtual Environments (MMVEs) and especially the idea of a ''3D Web'' as a combination of a MMVE and today's WWW currently attracts a lot of attention. The realization of such a vision on a global scale though poses severe technical challenges to the underlying network infrastructure. It is generally accepted that such a global scale(More)
— The vision of a " 3D Web " as a combination of massive online virtual environments and today's WWW currently attracts a lot of attention. While it provides a multitude of opportunities, the realization of this vision on a global scale poses severe technical challenges. This work-in-progress paper intends to point out some of the major challenges and(More)
In order to realistically simulate algorithms or evaluate P2P overlay topologies, a detailed model of the underlying router topology is required. Since actively measuring this topology is extremely laborious and furthermore a waste of network resources, traditionally topology generators are used in order to create synthetic router-level graphs. For this,(More)
Recent research in the field of complex networks has shown that-beyond microscopic structural qualities-global statistical parameters are sufficient to describe a surprising number of their macroscopic properties. This article argues that such statistical parameters can be monitored by nodes in a decentralized and efficient way. The so achieved awareness of(More)
Received (received date) Revised (revised date) In this article we present and evaluate an epidemic scheme for the synchronization of coupled Kuramoto oscillators in communication networks. It addresses the problem of efficiently providing globally synchronous time epochs in complex, dynamic Peer-to-Peer network topologies. Rather than the usual model of(More)
BACKGROUND AND PURPOSE Previous studies of diffusion-weighted imaging (DWI) in fetuses are limited. Because of the need for normative data for comparison with young fetuses and preterm neonates with suspected brain abnormalities, we studied apparent diffusion coefficient (ADC) values in a population of singleton, nonsedated, healthy fetuses. MATERIALS AND(More)
In this article we evaluate an epidemic algorithm for the synchronization of coupled Kuramoto oscillators in complex Peer-to-Peer topologies. The algorithm requires a periodic coupling of nodes to a single random one-hop-neighbor. The strength of the nodes' couplings is given as a function of the degrees of both coupling partners. We study the emergence of(More)
Distributed Virtual Environments (DVEs) have grown popular in various fields of application. Apart from providing great collab-orational opportunities in an immersive setting, large-scale DVEs pose severe scalability challenges. Although P2P approaches have proven to be effective for tackling many of these issues, still load delay problems remain in regions(More)
—When dealing with dynamic large-scale topologies such as those underlying peer-to-peer (P2P) distributed virtual environments (DVE), one inescapably reaches the point where either a) simulations lack human behavior and assessment or where b) practical experiments on a small scale do not yield significant results. The restrictions resulting from the(More)