1,721,031 research outputs found
A convergent architecture for service continuity and personalization : architectural and functionnal aspects
No full textDe nos jours, l'avènement de la dérégulation et l'ouverture à la concurrence stimulent les fournisseurs de services à être de plus en plus compétitifs et à attirer de plus en plus d'abonnés afin de faire face aux fortes pressions du marché. Pour ce faire, les fournisseurs d'aujourd'hui favorisent une approche user-centric qui consiste à fournir le plus rapidement possible des services orientés utilisateurs. Cette approche user-centric gagne de plus en plus d'ampleur suite à l'émergence du contexte de nouvelle génération de réseaux et de services (NGN/NGS). Dans ce contexte où les convergences de réseaux et de services sont omniprésentes, l'utilisateur devient de plus en plus nomade et il réclame l'accès à n'importe quel service, n'importe où, n'importe quand et par n'importe quel moyen. Son but est de composer dynamiquement une session personnalisée de services, dans laquelle converge un ensemble de services multi-domaines (Telco, Web et IT). Ensuite, il désire maintenir la continuité de cette session de services tout au long de sa mobilité spatiale et temporelle. Dans le cadre de cette thèse, nous proposons une nouvelle architecture de services, dénommée NGN/NGS Middleware qui suit une approche horizontale distribuée évènementielle et orientée service, et qui s'appuie sur un nouveau modèle de services. De plus, nous proposons deux solutions de gestion de la continuité de services, basées sur des communautés virtuelles et sur un handover sémantique. Ces solutions tiennent compte des préférences de l'utilisateur ainsi que de son contexte ambiant. Enfin, nous pensons apporter une réponse au monde du cloud en intégrant nos solutions pour gérer les utilisateurs du cloud.Nowadays, with the advent of deregulation, service providers aim to be more competitive and to attract more subscribers in order to cope with the high market pressure. For this purpose, today's providers support a user-centric approach that consists on quickly providing user oriented services. This user-centric approach becomes more and more significant with the emergence of the next generation networks and services (NGN/NGS) context. Within this context, where network convergence and service convergence are omnipresent, the end-user becomes more nomadic and claims the access to any service, anywhere, anytime and by any means. His goal is to dynamically compose a personalized service session while converging a set of multi-domain services (Telco, Web and IT). Then, he wants to maintain the continuity of this service session throughout his spatial and temporal mobility. Within the scope of this thesis, we propose a novel service architecture, namely the NGN/NGS Middleware, that adopts an horizontal distributed event-driven and service oriented approachn and that is based on a novel service model. In addition, we propose two solutions for service continuity management, that are based on virtual communities and on a semantic handover. These solutions take into consideration the user's preferences and ambiant context. At the end, we think we could answer some cloud computing challenges by integrating our solutions to manage cloud users
Security of converging future architectures for personalized services : architectural and protocol aspects
No full textL’émergence et l’évolution des réseaux de nouvelles génération (NGN) a soulevé plusieurs défis surtout en termes d’hétérogénéité, de mobilité et de sécurité. En effet, l’utilisateur est capable, dans un tel environnement, d’avoir accès à plusieurs réseaux, à travers différents terminaux, avec un choix vaste de services fournis par différents fournisseurs. De plus, les utilisateurs finaux demandent à être constamment connectés n’importe où, n’importe quand et n’importe comment. Ils désirent également avoir un accès sécurisé à leurs services à travers une session dynamique, seamless et continue selon leurs préférences et la QoS demandée. Dans ce contexte, la sécurité représente une composante majeure. Face à cette session user-centric sécurisée, plusieurs défis se posent. L’environnement est de plus en plus ouvert, de multiples services ne sont pas connus d’avance et nous avons une diversité de communications entre les services et les utilisateurs. L’hétérogénéité des ressources (terminaux, réseaux et services) impliquées dans la session de l’utilisateur accentue la complexité des tâches de sécurité. Les différentes déclinaisons de mobilité (mobilité de l’utilisateur, mobilité du terminal, mobilité du réseau et mobilité du service) modifient la session user-centric que l’on veut unique, sécurisée et seamless avec la délivrance d’un service continu.The emergence and evolution of Next Generation Networks (NGN) have raised several challenges mainly in terms of heterogeneity, mobility and security. In fact, the user is able, in such environment, to have access to many networks, via multiple devices, with a vast choice of services offered by different providers. Furthermore, end-users claim to be constantly connected anywhere, anytime and anyhow. Besides, they want to have a secure access to their services through a dynamic, seamless and continuous session according to their preferences and the desired QoS. In this context, security represents an important concern. In fact, this user-centric session should obviously be secured. However, many challenges arise. In such environment, system boundaries, which were well delimited, become increasingly open. Indeed, there are multiple services which are unknown in advance and multiple communications between services and with users. Besides, heterogeneity of involved resources (terminals, networks and services) in the user session increases the complexity of security tasks. In addition, the different types of mobility (user, terminal, network and service mobility) affect the user-centric session that should be unique, secure and seamless and ensure continuity of services
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Self-controlled service-centric Internet of Things
No full textA l'heure du numérique, la quantité d'objets connectés ne cesse de croître et de se diversifier. Afin de supporter cette complexité croissante, nous avons souhaité apporter un maximum d'automatismes à l'Internet des Objets de manière à garantir une qualité de service (QoS) de bout en bout. Pour ce faire, un composant de service autocontrôlé est proposé pour intégrer l'objet dans l'écosystème digital. Grâce à la calibration de chaque service, qui permet la connaissance du comportement, une composition automatisée devient possible. Nous avons illustré la faisabilité de notre approche à travers un cas d'étude. Nous avons également montré comment les objets connectés peuvent s'assembler eux-mêmes, coopérant pour atteindre un objectif commun, tout en répondant aux exigences de QoS globales.In the digital era, the number of connected objects continues to grow and diversify. To support this increasing complexity, we wanted to bring a maximum of automatisms to the Internet of Things in order to guarantee end-to-end quality of service (QoS). To do this, a self-controlled service component is proposed to integrate the object into the digital ecosystem. Thanks to the calibration of each service, which makes it possible to know the behaviour, an automated composition becomes possible. We have illustrated the feasibility of our approach on a case study. We also have shown how connected objects can assemble themselves, cooperating to achieve a common objective, while meeting global QoS requirements
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Vers l'autogestion pour une continuité de service intégrée et "sans couture"
No full textWe are interested in the seamless service continuity ensuring E2E QoS. We identify first the vision of "User-Centric". The challenges are different mobility. Our contributions are organizational and functional solutions. Our 1st contribution was to propose an organizational model that supports our vision, including the service personalisation. On the supplier side, the trans organisaitonal part is considered. To implement this model, we proposed service composition management. This 2nd contribution is based on the COIs whose common interest is the continuity of service. To anticipate any impact of mobility, we constuct the CVs with functionally and QoS equivalent components. Thus, the necessary replacement of components is done automatically and dynamically. We've linked each mobility with a level of architecture, by combining a self-managed CV through a P2P protocol. We called 'sessionware "as all the " supporting services "that can run during our session. Our 3rd contribution focuses on the service delivery and responsible for managing service continuity. Based on the analysis of mobility, we have identified session mobility for which our 4th contribution is a crosslayer and dynamic Binding which makes the continuity of service transparent. For the respect of the E2E QoS, we use VPxN. The aim of this 5th contribution is the QoS self control to ensure the "seamless". Finally, the feasibility is shown by simulations in JXTA and experiments on IMS.Nous nous intéressons à la continuité de service sans couture en assurant une QoS d E2E. Nous recensons d abord la vision User-Centric . Les verrous à lever sont les différentes mobilités. Nos contributions sont des solutions d ordre organisationnel et fonctionnel. Notre 1ière contribution a été de proposer un modèle organisationnel supportant notre vision et incluant la personnalisation du service. Du côté fournisseur, le transorganisationnel est envisagé. Afin de mettre en œuvre ce modèle, nous avons proposé de gestion de composition de service. Cette 2ième contribution repose sur les CoIs dont l intérêt commun est la continuité de service. Pour anticiper tout impact de mobilité, nous créons des CVs regroupant les composants fonctionnellement et QoS équivalents. Ainsi le remplacement des composants nécessaire se fait automatiquement et dynamiquement. Nous avons relié chaque mobilité à un niveau d architecture, en leur associant une CV autogérée à travers un protocole P2P. Nous avons dénommé sessionware l ensemble des services supports pouvant intervenir durant notre session. Notre 3ième contribution porte sur la fourniture du service responsable de la gestion de la continuité de service. Fondé sur l analyse des mobilités, nous avons identifié la mobilité de session pour laquelle notre 4ième contribution propose un Binding crosslayer et dynamique pour rendre transparent la continuité de service. Pour le respect de la QoS d E2E, nous avons recours au VPxN. Le but de cette 5ième contribution est d auto contrôler la QoS pour assurer le sans couture . Finalement, la faisabilité est montrée par des simulations en JXTA et des expérimentations sur IMS.PARIS-Télécom ParisTech (751132302) / SudocSudocFranceF
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Service Creation and Self-Management Mechanisms for Mobile Cloud Computing
No full textToday, service providers need to develop competitive applications for a quick time-to-market to attract and retain end users. To facilitate the task of developers, we introduce a reference Service Creation Environment based on service component and self-management mechanisms. This environment uses a fairly high integration level using meta-modeling techniques and exchange formats: Meta-Object Facility (MOF), Extensible Markup Language (XML), OVF ++ (Open Virtualization Format). Our approach allows developers to design the basic service components based on Quality of Service (QoS), to build the service by composition, and to manage a mobile session by ubiquitous services and the Virtual Service Community
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