Toward a Context-Aware and Automatic Evaluation of Elderly Dependency in Smart Homes and Cities

International audienceIn this work, we propose a framework for automatic dependency evaluation that can notify the changes of the elderly dependency, hence providing persons with required services in time. In order to validate our approach, we target the French dependent population. Especially, we focus our proposal on the AGGIR dependency model used in the French medical field. Our objective is to provide a flexible architecture and an extensible model linked to opened data that can refer to a wide variety of services (hardware sensors and software; simple or composed services)

Context-Aware Adaptation for Mobile Devices

International audienceThis paper discusses the problem of content adaptation for mobile devices. The adaptation considers the context of the client and also the environment where the client request is received. A device independent model is defined and used in order to achieve automatic adaptation of the content based on its semantic and the capabilities of the target device. Our system includes a context description model and a client repository and offers device contexts management and querying functions. The proposed system uses the XQuery language to query the profiles and delivers the results in the form of SOAP services

Adapted Content Delivery for Different Contexts

International audienceIn this paper, we present a framework which allows adapted content delivery for different target contexts. This framework is based on a Universal Profiling Schema UPS for describing the environment characteristics and on an profile exchange protocol. In the server and the proxy side, we give a strategy for matching the different constraints (clients, servers, content, etc.) in order to find an agreement between the server adaptation capabilities and the client preferences and constraints. Usually such environments are subject to frequent changes. To tackle this difficulty, we propose a dynamic adaptation approach based on XSLT for structural transformation and resource aware transcoders for the media adaptation

Content Interaction and Formatting for Mobile Devices

International audienceIn this paper we present a content adaptation system for mobile devices. The system enables the presentation of multimedia content and considers the problem of small screen display of mobile terminals. The approach combines structural and media adaptation with the content formatting and proposes a system that handles the user interaction and the content navigation

Encoding Multimedia Presentation for User Preferences and Limited Environments

International audienceThis paper discusses a new approach of generating TV-like multimedia presentations that are adapted to the target user preferences and to limited devices. Three main points are discussed: 1) The encoding of video presentations from a SMIL specification 2) The adaptation of the video content based on the user preferences, and 3) The delivery of adapted multimedia presentations. The used architecture includes a content server, an adaptation proxy and a set of small devices in the form of personal device assistants (PDA). These devices request the content through a wireless network. In order to show how the system behaves regarding the user preferences and capabilities, two negotiation dimensions are considered: the user language and the memory capability of the device. The first dimension is used to generate a content that can be understood by the target user, e.g. a video with subtitles written in the preferred language. The second dimension is chosen to solve the problem of the system blocking that usually happens when limited devices access rich multimedia presentations over the network

Mécanismes de collaboration entre réseaux et services applicatifs pour l'optimisation des ressources et des services

Dans cette nouvelle ère du numérique, l'accès à l'information est entré désormais dans une autre dimension. Nous assistons à la dominance d'un modèle fondé sur les opportunités offertes par un accès mondialisé à l'Internet et à son application phare : le "World Wide Web". Les services se sont multipliés. Les terminaux se sont diversifiés. Les technologies de transport se sont améliorées. Les attentes se sont élevées. Dans cette spirale que nous nous abstenons de qualifier, les opérateurs se trouvent désormais confrontés à une croissance soutenue du trafic dans leurs réseaux, en grande partie due au transport de flux vidéo. Les fournisseurs de services sur Internet se trouvent aussi concernés par la problématique de la qualité de service dont dépend la satisfaction de leurs utilisateurs. Pour l'ensemble des acteurs, ces nouvelles tendances présentent à la fois des défis et des opportunités. Les défis se concentrent dans la problématique de gestion de la demande croissante du trafic tout en maintenant une qualité d'expérience appropriée pour les utilisateurs. Les opportunités proviendront de l'adéquation entre une demande croissante des services Web en termes de qualité de services et des ressources qui devront supporter la distribution de ces services. Il est crucial pour chaque acteur de bien se positionner dans la chaîne de valeur pour gérer cette adéquation. Le rôle que prendra le réseau support, simple ensemble de tuyaux surdimensionnés, ou bien réseau intelligent offrant des fonctions avancées de contrôle illustre parfaitement cet enjeu. Ces deux alternatives sont respectivement connues sous les termes "dumb-pipe" ou "smart network". Dans cette thèse, nous considérons une nouvelle approche, qui se veut simple, efficace et adaptée pour faire face à ces défis. Les opérateurs réseaux et les fournisseurs de services sont mutuellement gagnants dans l'amélioration du transport de données dans les réseaux tout en continuant à opérer leur propre infrastructure. Cette démarche coopérative est le point de départ de nos travaux qui visent à définir un cadre, une architecture et des techniques appropriées qui amèneront ces acteurs à collaborer en vue de gérer conjointement cette problématique. Cette collaboration est nécessaire car chaque acteur quoique prisonnier de ses contraintes peut les transformer en relations contractuelles dans un processus client fournisseur pour l'optimisation de la gestion du trafic.In this new digital world, driven by the dominance of a model based on the opportunities offered by global access to the Internet and its killer app: the World Wide Web, access to information is becoming a matter of a good experience and responsiveness. We are witnessing the Web services are of increasing popularity. New types of terminals are proposed. Communications technologies are improved. Users expectations are becoming higher. In such a context, network operators are facing serious challenges arising from the management of a massive traffic growth, largely driven by the increasing amount of video streams while internet services providers are also concerned by the issue of providing an adequate quality of experience to their end-users. For both actors, these dual trends present both challenges and opportunities. The challenges arise from the issues of managing the growing demand for traffic while maintaining appropriate quality of experience for users. Opportunities come from a smart management of the increasing demands of Web services in terms of quality of services and of the resources that will support the delivery of these services. It is then crucial for each actor to be well-positioned in the value chain to take part in this process. The role that will be played by the networks, as a basic set of oversized pipes, or as an intelligent network providing advanced management facilities, perfectly illustrates this issue. These two alternatives are respectively known as the "dumb-pipe" or "smart networks". In this thesis, we consider a new approach, which is simple, effective and adapted to meet these challenges. Network operators and service providers can mutually benefit from improving the data delivery in the networks while continuing to fully control their infrastructures. This collaborative approach is the starting bloc of our work aiming at defining a framework, an architecture and appropriate procedures to bring these actors to work together to manage this problem. This collaboration is particularly necessary because each actor, though prisoner of its constraints and capacities, can turn them into a contractual relation with the other in a client-supplier process for the optimization of traffic management.RENNES1-Bibl. électronique (352382106) / SudocSudocFranceF

NAC, une architecture pour l'adaptation multimédia sur le web

National audienceThe Web is evolving towards richer contents and diverse media that are accessed with different devices through multiple kinds of network. This heterogeneous, mobile and changing environment requires that multimedia information delivered by servers be adapted to the actual conditions of use. For that purpose, a number of methods, languages, formats and protocols are developed, especially by W3C. The NAC architecture presented in this article was designed and implemented based on these technologies, focusing on adaptation processing, on environment description models, on negotiation protocols, and on content transformations