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We are pleased to receive Roberto Azeverdo from PUC Rio (Brazil). He will give a talk on Thursday, December 14 at 10:30 in room Sardaigne (F102, blue level).

Exploring Integrated Broadcast-broadband for Advanced Multimedia Services

Integrated Broadcast-Broadband (IBB) multimedia services combine both broadcast and broadband technologies to provide high quality, flexible, and interactive multimedia experiences. Broadcast provides efficient simultaneous delivery of high-quality information to many viewers. Broadband augments the broadcast service and enables personalized features that can drive the user engagement and provide an improved quality of experience.

In this talk, I will discuss the foundations of IBB multimedia services, cover ongoing research, provide practical concerns about them, and details two advanced IBB use cases from our current research efforts: an end-to-end interactive depth-based 3D video, and a high-quality IBB companion screen services.

On the depth-based 3D video side, I will discuss the coding, transmission, delivery, and rendering of an IBB system that supports immersive interactive applications for multiview autostereoscopic 3D displays.

On the companion screens side, I will present the foundations of our solution, which supports interactive distributed multimedia applications with a fine inter-device synchronization.

Finally, I will provide additional envisioned scenarios, highlight some of the open issues, and discuss research possibilities in the area.

We are pleased to receive Stevens Le Blond from EPFL (Switzerland). He will give a talk on Tuesday, December 5 at 10:30 in room Crête (F402, red level).

Towards providing digital immunity to humanitarian organizations

Humanitarian action, the process of aiding individuals in situations of crises, poses unique information-security challenges due to natural or manmade disasters, the adverse environments in which it takes place, and the scale and multi-disciplinary nature of the problems. Despite these challenges, humanitarian organizations are transitioning towards a strong reliance on digitalization of collected data and digital tools, which improves their effectiveness but also exposes them to computer security threats. This talk presents the first academic effort seeking to understand and address the computer-security challenges associated with digitalizing humanitarian action.

First, I will describe a qualitative analysis of the computer-security challenges of the International Committee of the Red Cross (ICRC), a large humanitarian organization with over sixteen thousand employees, legal privileges and immunities, and over 150 years of experience with armed conflicts and other situations of violence worldwide. Second, I will present a research agenda to design and implement anonymity networks, block chains, and secure-processing systems addressing these challenges, and to deploy them in collaboration with the ICRC. I will close with a discussion on how to generalize our approach to provide digital immunity to humanitarian and other at-risk organizations.

After having enjoyed sun bathing at INRIA Sophia-Antipolis, and actual bathing at the MPI-SWS, Stevens is now skiing in Switzerland where he’s a research scientist at EPFL. His Ph.D. thesis on the privacy analysis of the Skype protocol has has led to privacy enhancements of the Skype architecture which is daily used by hundreds of millions of users. His post-graduate work on anonymity networks was qualified of the “[next-generation] anonymity network closest to deployment” by ArsTechnica. He is one of the first academic researchers to have studied the computer security practices of politically-motivated attackers and their targets. His research has been published in leading conferences such as Oakland, Usenix Security, NDSS, SIGCOMM, and IMC.

Stevens’ personal page: https://people.epfl.ch/stevens.leblond

The 7th workshop on scalable computing (WOS7), co-organized by Technicolor and Inria, will take place at Technicolor Rennes on Thursday, the 30th of November 2017.
For more details about the event, such as the registration and schedule, please refer to the workshop page.

Anne-Marie Kermarrec received the 2017 Inria-Académie des sciences-Dassault Systèmes award for innovation for the technology transfer of her research work into the Mediego start-up that she created.

(French version below)

You are cordially invited to attend the PhD defense of Resmi Ariyattu that will be held on July 5, 2017 at 14:00 in room Metivier and for a drink in Room Minquiers.

Jury members:
Sara Bouchenak, Professor at Insa Lyon
Fabrice Huet, Associate Professor at University of Nice
Barry Porter, Lecturer at Lancaster University UK
Anne-Cécile Orgerie, Research scientist at CNRS Rennes
David Bromberg, Professor at the University of Rennes 1
François Taiani, Professor at the University of Rennes 1

Title: Towards federated social infrastructures for plug-based decentralized social networks

In this thesis, we address two issues in the area of decentralized distributed systems: network-aware overlays and collaborative editing.

Even though network overlays have been extensively studied, most solutions either ignores the underlying physical network topology, or uses mechanisms that are specific to a given platform or applications. This is problematic, as the performance of an overlay network strongly depends on the way its logical topology exploits the underlying physical network. To address this problem, we propose Fluidify, a decentralized mechanism for deploying an overlay network on top of a physical infrastructure while maximizing network locality. Fluidify uses a dual strategy that exploits both the logical links of an overlay and the physical topology of its underlying network to progressively align one with the other. The resulting protocol is generic, efficient, scalable and can substantially improve network overheads and latency in overlay based systems.

The second issue that we address focuses on collaborative editing platforms. Distributed collaborative editors allow several remote users to contribute concurrently to the same document. Only a limited number of concurrent users can be supported by the currently deployed editors. A number of peer-to-peer solutions have therefore been proposed to remove this limitation and allow a large number of users to work collaboratively. These decentralized solution assume however that all users are editing the same set of documents, which is unlikely to be the case. To open the path towards more flexible decentralized collaborative editors, we present Filament, a decentralized cohort-construction protocol adapted to the needs of large-scale collaborative editors. Filament eliminates the need for any intermediate DHT, and allows nodes editing the same document to find each other in a rapid, efficient and robust manner by generating an adaptive routing field around themselves. Filament’s architecture hinges around a set of collaborating self-organizing overlays that utilizes the semantic relations between peers. The resulting protocol is efficient, scalable and provides beneficial load-balancing properties over the involved peers.

Vous êtes cordialement invités à venir assister à la soutenance de thèse de Resmi Ariyattu qui se tiendra mercredi 5 juillet 2017 à 14h en salle Métivier ainsi qu’au pot qui suivra en Salle Minquiers.

Composition du jury :
Sara Bouchenak, Professeur, Insa de Lyon
Fabrice Huet, Maître de Conférence, Université de Nice
Barry Porter, Maître de Conférence, Université de Lancaster
Anne-Cécile Orgerie, Chargée de recherche, CNRS Rennes
David Bromberg, Professeur, Université Rennes 1
François Taiani, Professeur, Université Rennes 1

Titre : Vers des infrastructures sociales fédérées pour des réseaux sociaux décentralisés à base d’ordinateurs contraints

Résumé :
Dans cette thèse, nous abordons deux problèmes soulevés par les systèmes distribués décentralisés – le placement de réseaux logiques de façon compatible avec le réseau physique sous-jacent et la construction de cohortes d’éditeurs pour dans les systèmes d’édition collaborative.

Bien que les réseaux logiques (overlay networks) été largement étudiés, la plupart des systèmes existant ne prennent pas ou prennent mal en compte la topologie du réseau physique sous-jacent, alors que la performance de ces systèmes dépend dans une grande mesure de la manière dont leur topologie logique exploite la localité présente dans le réseau physique sur lequel ils s’exécutent. Pour résoudre ce problème, nous proposons dans cette thèse Fluidify, un mécanisme décentralisé pour le déploiement d’un réseau logique sur une infrastructure physique qui cherche à maximiser la localité du déploiement. Fluidify utilise une stratégie double qui exploite à la fois les liaisons logiques d’un réseau applicatif et la topologie physique de son réseau sous-jacent pour aligner progressivement l’une avec l’autre. Le protocole résultant est générique, efficace, évolutif et peut améliorer considérablement les performances de l’ensemble.

La deuxième question que nous abordons traite des plates-formes d’édition collaborative. Ces plates-formes permettent à plusieurs utilisateurs distants de contribuer simultanément au même document. Seuls un nombre limité d’utilisateurs simultanés peuvent être pris en charge par les éditeurs actuellement déployés. Un certain nombre de solutions pair-à-pair ont donc été proposées pour supprimer cette limitation et permettre à un grand nombre d’utilisateurs de collaborer sur un même document sans aucune coordination centrale. Ces plates-formes supposent cependant que tous les utilisateurs d’un système éditent le même jeu de document, ce qui est peu vraisemblable. Pour ouvrir la voie à des systèmes plus flexibles, nous présentons, Filament, un protocole décentralisé de construction de cohorte adapté aux besoins des grands éditeurs collaboratifs. Filament élimine la nécessité de toute table de hachage distribuée (DHT) intermédiaire et permet aux utilisateurs travaillant sur le même document de se retrouver d’une manière rapide, efficace et robuste en générant un champ de routage adaptatif autour d’eux-mêmes. L’architecture de Filament repose sur un ensemble de réseaux logiques auto-organisées qui exploitent les similarités entre jeux de documents édités par les utilisateurs. Le protocole résultant est efficace, évolutif et fournit des propriétés bénéfiques d’équilibrage de charge sur les pairs impliqués.

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