Bilan des connaissances, inventaires 2016 et cartographie de cinq coléoptères saproxyliques d’intérêt communautaire dans les sites Natura 2000 de la région PACA : Stephanopachys linearis, Stephanopachys substriatus, Limoniscus violaceus, Osmoderma eremita et Rosalia alpina

Sept espèces de coléoptères saproxylophages inscrites à l'annexe 2 de la directive Habitats (DH2) sont connues avec certitude en région PACA. Une huitième a été signalée : Cucujus cinnaberinus (Cucujidae), dont une ancienne mention dans le secteur de Saint-Martin-Vésubie semble plausible (Brustel & Gouix, 2012

Actes de la 6e conférence conjointe Journées d'Études sur la Parole (JEP, 33e édition), Traitement Automatique des Langues Naturelles (TALN, 27e édition), Rencontre des Étudiants Chercheurs en Informatique pour le Traitement Automatique des Langues (RÉCITAL, 22e édition. Volume 2 : Traitement Automatique des Langues Naturelles

@ 6ème conférence conjointe: JEP-TALN-RECITAL 2020no abstrac

Aspects de protection et de gestion de la biodiversité ligérienne.

International audienc

Aspects de protection et de gestion de la biodiversité ligérienne.

International audienc

Étude expérimentale des champs turbulents acoustiques à l'immédiat aval d'une onde de choc

National audienceAn original measurement technique based on Rayleigh scattering (Collective Light Scattering) was used in the flow conditions of a normal Mach 2.85 shock wave/homogeneous turbulence interaction. The experimental investigation was limited to the region just downstream of the shock. A non-dimensional attenuation law for the evanescent acoustic waves was found using CLS measurements. This law is significantly different from the one predicted by the Linear Interaction Analysis. However, it was confirmed by hot-wire measurements for which quite severe assumptions were used.Une nouvelle méthode de mesure basée sur la diffusion Rayleigh (Diffusion Collective de la Lumière) a été mise en œuvre et testée dans une configuration d'intéraction onde de choc droite/turbulence homogène isotrope à Mach 2,85. L'investigation expérimentale s'est concentrée sur la région immédiatement en aval du choc. Les mesures DCL ont permis de déterminer une loi adimensionnelle d'évanescence des ondes acoustiques émise à l'aval du choc. Cette loi, différente de celle issue de la théorie, est toutefois confirmée par l'exploitation de mesures fil chaud mettant en œuvre des hypothèses assez sévères

Firefox OS Ecosystem: Ambitions and Limits of an Open Source Operating System for Mobile Devices

International audienceFirefox OS is an operating system for mobile devices. It is developed by Mozilla and is based on web technologies. Developed applications are therefore not tied to a given type of hardware. Mozilla works on standardisation of Web APIs, so that the device hardware could be accessed more easily. It also introduced its sign-in system for the Web and furthermore, it wants to redefine the way payments work for mobile applications. Firefox OS is not directly competing with Android and iOS, although it has some common target markets with Android. It could be an opportunity to weaken the iOS and Android duopoly. For now it targets users that don't have smartphones yet and is mostly used on low-end devices. The biggest challenge of Firefox OS is to assure a stable position in the mobile OS ecosystem and to get a large volume of users. Mozilla has an ambition to improve the web and make the web the platform. However developing the Firefox OS and ensuring its important place on the market is difficult because of technological and business limits that will be discussed in this chapter

Evaluation of network solutions for improving WebRTC quality

International audienceThe omnipresence of real-time communication has significantly increased in recent years. Nevertheless it is treated as any best effort traffic, regardless its vulnerability to network conditions. WebRTC allows communication between browsers and uses application layer mechanisms to assure the quality (e.g. congestion control), but would benefit from network layer mechanisms. In this paper we evaluate specialized network treatment based on queuing management for uplink in wired access networks. We propose a test environment and later, based on application and network layer measurements, we assess the impact of proposed solutions on WebRTC quality. We prove that best effort is not enough to assure WebRTC communication in a presence of TCP flows and that network layer mechanisms can significantly improve the perceived quality of WebRTC communication

Approaches for Offering QoS and Specialized Traffic Treatment for WebRTC

International audienceReal-time communications are much more than only traditional voice services. They have become interactive, transversal and are expected to be integrated as a feature of other applications. More and more communications services are offered by web companies that have been taking advantage of Internet flat rate charges and mostly use best-effort capabilities. Simultaneously, many efforts are currently devoted to improve the quality of experience of clients using communication services. The paper analyses current implementations of managed VoIP and emerging WebRTC technology in order to assess the possibility of offering specialized media flow treatments to real-time web communications. It proposes two research approaches: "in-network" and "over-the-network" and several elements that could contribute to an overall solution allowing web communication services to benefit from specialized network services

A distributed water level network in ephemeral river reaches to identify the hydrological responses of anthropogenic catchments

International audienceIn order to study the impact of land use change on the water cycle, distributed hydrological models are more and more used, because they have the ability to take into account the land surface heterogeneity and its evolution due to anthropogenic pressure. These models provide continuous distributed simulations of streamflow, runoff, soil moisture, etc, which, ideally, should be evaluated against continuous distributed measurements, taken at various scales and located in nested sub-catchments. Distributed network of streamflow gauging stations are in general scarce and very expensive to maintain. Furthermore, they can hardly be installed in the upstream parts of the catchments where river beds are not well defined. In this paper, we present an alternative to these standard streamflow gauging stations network, based on self powered high resolution water level sensors using a capacitive water height data logger. One of their advantages is that they can be installed even in ephemeral reaches and from channel head locations to high order streams. Furthermore, these innovative and easily adaptable low cost sensors offer the possibility to develop in the near future, a wireless network application. Such a network, including 15 sensors has been set up on nested watersheds in small and intermittent streams of a 7 km2 catchment, located in the mountainous Mont du Lyonnais area, close to the city of Lyon, France. The land use of this catchment is mostly pasture, crop and forest, but the catchment is significantly affected by human activities, through the existence of a dense roads and paths network and urbanized areas. The equipment provides water levels survey during precipitation events in the hydrological network with a very accurate time step (2 min). Water levels can be related to runoff production and catchment response as a function of scale. This response will depend, amongst other, on variable soil water storage capacity, physiographic data and characteristics of raining events. Several raining events, with different characteristics, have been extracted from a large data set collected during two years. From these numerous hydrographs, analyses of flow dynamic through rising limbs, falling limbs and lag times show different behaviour pattern according to instrumented reaches. The paper will present first results from this synoptic survey. It shows the dynamic spatial pattern of stream flow along the water pathes. At finer scale, this synoptic survey could show the impacts of anthropogenic features on water concentration and their hydrological connectivity to natural river network