Peer-assisted Information-Centric Network (PICN): A Backward Compatible Solution

International audienceInformation-Centric Networking (ICN) is a promising solution for most of Internet applications where the content represents the core of the application. However, the proposed solutions for the ICN architecture are associated with many complexities including pervasive caching in the Internet and incompatibility with legacy IP networks, so the deployment of ICN in real networks is still an open problem. In this paper, we propose a backward compatible ICN architecture to address the caching issue in particular. The key idea is implementing edge caching in ICN, using a coalition of end clients and edge servers. Our solution can be deployed in IP networks with HTTP requests. We performed a trace-driven simulation for analyzing PICN benefits using IRCache and Berkeley trace files. The results show that in average, PICN decreases the latency for 78% and increases the content retrieval speed for 69% compared to a direct download from the original web servers. When comparing PICN with a solution based on central proxy servers, we show that the hit ratio obtained using a small cache size in each PICN client is almost 14% higher than the hit ratio obtained with a central proxy server using an unlimited cache storage

CONCEPTION ET DEVELOPPEMENT INDUSTRIEL D'UN CIMENT DE SCELLEMENT DES IMPLANTS ORTHOPEDIQUES, ASSOCIE A LA GENTAMICINE (DES PHARMACIE INDUSTRIELLE ET BIOMEDICALE)

LYON1-BU Santé (693882101) / SudocSudocFranceF

The evolution of outcomes and indications for the dual-mobility cup: a systematic review

PURPOSE: Instability following total hip arthroplasty remains a common and disabling complication. The dual mobility cup (DMC) allows a reduction in the dislocation rate. An increasing number of studies have been undertaken to better understand DMC long term outcomes and complications. The goal of this systematic review was to clarify its different uses and outcomes according to the indications. METHODS: A comprehensive literature review was performed using the keywords 'dual mobility' and 'tripolar cup' with no limit regarding the year of publication. One hundred seventy six publications were identified. RESULTS: Current literature shows that "contemporary" dual mobility cup are a significant indication to manage instability following primary and revision hip arthroplasty. Survivorship at midterm is comparable to other articulations for primary THA, but is more difficult to evaluate in revision. Intra-prosthetic dislocation, wear, and loosening are now uncommon with new generations of DMC. CONCLUSIONS: Compared to previous generations of DMC, the current "contemporary" DMC presents a significant improvement. Current literature reveals a tendency to increase the indications but further studies with long term follow up remain important to consolidate these findings

Early Eocene vigorous ocean overturning and its contribution to a warm Southern Ocean

International audienceThe early Eocene (similar to 55 Ma) was the warmest period of the Cenozoic and was most likely characterized by extremely high atmospheric CO2 concentrations. Here, we analyze simulations of the early Eocene performed with the IPSL-CM5A2 Earth system model, set up with paleogeographic reconstructions of this period from the DeepMIP project and with different levels of atmospheric CO2. When compared with proxy-based reconstructions, the simulations reasonably capture both the reconstructed amplitude and pattern of early Eocene sea surface temperature. A comparison with simulations of modern conditions allows us to explore the changes in ocean circulation and the resulting ocean meridional heat transport. At a CO2 level of 840 ppm, the early Eocene simulation is characterized by a strong abyssal overturning circulation in the Southern Hemisphere (40 Sv at 60 degrees S), fed by deepwater formation in the three sectors of the Southern Ocean. Deep convection in the Southern Ocean is favored by the closed Drake and Tasmanian passages, which provide western boundaries for the buildup of strong subpolar gyres in the Weddell and Ross seas, in the middle of which convection develops. The strong overturning circulation, associated with subpolar gyres, sustains the poleward advection of saline subtropical water to the convective regions in the Southern Ocean, thereby maintaining deepwater formation. This salt-advection feedback mechanism is akin to that responsible for the present-day North Atlantic overturning circulation. The strong abyssal overturning circulation in the 55Ma simulations primarily results in an enhanced poleward ocean heat transport by 0.3-0.7 PW in the Southern Hemisphere compared to modern conditions, reaching 1.7PW southward at 20 degrees S, and contributes to keeping the Southern Ocean and Antarctica warm in the Eocene. Simulations with different atmospheric CO2 levels show that ocean circulation and heat transport are relatively insensitive to CO2 doubling

Geodispersal as a Biogeographic Mechanism for Cenozoic Exchanges between Madagascar and Africa

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Biogeographic mechanisms involved in the colonisation of Madagascar by African vertebrates: rifting, rafting and runways

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Biogeographic mechanisms involved in the colonisation of Madagascar by African vertebrates: rifting, rafting and runways

International audienc