PEIX , Fabrice

The realization of modern embedded systems increase the requirements of automatic or semi-automatic code distributing tools. Indeed the evolution of the hardware/software platform use for the realization of such systems turn toward heterogeneous chip network.Within the context of the synchronous language, all of their advantages, the...

Dans cet article, nous étudions la capacité des réseaux radio maillés dédiés à l'accès à Internet. Nous nous plaçons dans l'hypothèse d'un réseau synchrone fonctionnant en régime permanent où les transmissions partagent un même canal radio. Le routage et l'ordonnancement des transmissions ont un impact majeur sur la capacité fournie aux...

In this paper, we address the problem of computing the transport capacity of Wireless Mesh Networks dedicated to Internet access. Routing and transmission scheduling have a major impact on the capacity provided to the clients. A cross- layer optimization of these problems allows the routing to take into account contentions due to radio...

Wireless Mesh Networks (WMNs) have become an interesting answer for broadband wireless networking. Cross-layer optimization problems for WMNs deployment and management are necessary and challenging. In this paper we focus on jointly optimizing routing and link scheduling in a single-channel wireless mesh network, in order to maximize fair...

Many discrete-event simulators are developed concurrently, but with identical or similar purpose. This poster presents the Open Simulation Architecture (OSA), a discrete-event component-based simulation platform whose goal is to favor the reuse and integration of simulation software components and models. To favor reuse, OSA uses a layered...

Un des problèmes au coeur de l'optimisation des réseaux radio maillés est le routage et l'ordonnancement d'appels. Dans cet article, nous étudions une relaxation classique de ce problème qui consiste à répartir la capacité entre les ensembles d'appels simultanés de manière à garantir un débit suffisant à chaque routeur du réseau. Nous...

Wireless mesh network performance issues have been modeled by the Joint Routing and Scheduling Problem (JRSP) in which a maximum per-flow throughput is computed. A classical relaxation of JRSP, denoted as the Round Weighting Problem (RWP), consists in assigning enough weight to sets of compatible simultaneous transmissions (rounds), while...

The notion of Shared Risk Resource Groups (SRRG) has been introduced to capture survivability issues when a set of resources may fail simultaneously. Applied to Wavelength Division Multiplexing Network (WDM), it expresses that some links and nodes may fail simultaneously. The reliability of a connection therefore depends on the number of SRRGs...

The notion of Shared Risk Resource Groups (SRRG) has been introduced to capture survivability issues when a set of resources may fail simultaneously. Applied to Wavelength Division Multiplexing Network (WDM), it expresses that some links and nodes may fail simultaneously. The reliability of a connection therefore depends on the number of SRRGs...

International audience

Nous suivons la vie d'un puits Résif, depuis sa création, jusqu'à son sablage. Un comparatif des signaux est fait sur les puits Résif de l'OCA-Géoazur.

Over the past two years, several important actions have marked the operation of Résif stations by OCA-Géoazur. Among these activities, this poster presents the azimuth alignment of all Résif sensors, the installation of sensors in the Durance River stations using a new system of watertight tanks, the ISO, SAOF and PIAF stations and the...

This poster presents the steps from the creation of Résif wells to their sanding, as well as a comparison of the signals from the OCA-Geoazur's Résif wells in the seismological stations BLAF (Entrevennes, 04), MLYF (Forcalquier, 04), TRIGF (Trigance, 83) and ARTF (Artigues, 83). This poster was presented during the Résif Scientific and...

Le poster articulé en 2 parties présentent l'impact de la tempête Alex sur la récupération des données, et aussi des signaux mesurés par diverses stations Résif (dont RAP) installées à proximité des vallées concernées.

The development of low-cost Raspberry Shake (RS) seismological stations capable of providing scientifically relevantseismological information in near-real time has enabled a Haitian citizen network to be set up as part of a participatoryseismology experiment that Started in July 2019. This network currently operates 12 RS instruments. These are...

Abstract Seismic monitoring in Haiti is currently provided by a mixed network of low-cost Raspberry Shake (RS) seismic stations hosted by citizens, and short-period and broadband stations located mainly in neighboring countries. The level of earthquake detection is constantly improving for a better spatio-temporal distribution of seismicity as...

The disastrous situation in Haiti, marked by escalating insecurity, failing institutions, and widespread gang control in the capital, severely hampers effective management of the country's natural hazards both now and in the foreseeable future. Yet earthquakes – or hurricanes and floods – are not going to stop. But at the moment, the Haitian...

Le 14 Aout 2021, un séisme de magnitude 7.2 frappe le sud d'Haiti, cause la mort de 2500 personnes et la destruction de 53000 maisons. Ce séisme et ses répliques sont bien enregistrés par le réseau sismo-citoyen installé depuis 2019 en Haiti. Les données nous permettent de caractériser le choc principal (PGA de 0.32 g mesuré à 21 km) et de...