De 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.

Military simulation and command and control federations have become large, complex distributed systems that integrate with a variety of legacy and current simulations, and real command and control systems locally as well as globally. As these systems continue to become increasingly more complex so does the data that initializes them. This increased complexity has introduced a major problem in data initialization coordination which has been handled by many organizations in various ways. Serviceoriented architecture (SOA) solutions have been introduced to promote easier data interoperability through the use of standards-based reusable services and common infrastructure. However, current SOA-based solutions do not incorporate formal governance techniques to drive the architecture in providing reliable, consistent, and timely information exchange. This dissertation identifies the need to establish governance for common data initialization service development oversight, presents current research and applicable solutions that address some aspects of SOA-based federation data service governance, and proposes a governance reference model for development of SOA-based common data initialization services in military simulation and command and control federations.

Next Generation Networks (NGNs) aim to provide a unified network infrastructure to offer multimedia data and telecommunication services through IP convergence. NGNs utilize multiple broadband, QoS-enabled transport technologies, creating a converged packet-switched network infrastructure, where service-related functions are separated from the transport functions. This requires significant changes in the way how networks are managed to handle the complexity and heterogeneity of NGNs. This thesis proposes a Service Oriented Architecture (SOA) based management framework that integrates heterogeneous management systems in a loose coupling manner. The key benefit of the proposed management architecture is the reduction of the complexity through service and data integration. A network management middleware layer that merges low level management functionality with higher level management operations to resolve the problem of heterogeneity was proposed. A prototype was implemented using Web Services and a testbed was developed using trouble ticket systems as the management application to demonstrate the functionality of the proposed framework. Test results show the correcting functioning of the system. It also concludes that the proposed framework fulfils the principles behind the SOA philosophy.

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I enighet med teknikutvecklingen förändras även förutsättningarna för kostnadseffektiva IT-miljöer. Systemarkitekturen för mjukvarusystem förändras i samband med detta och verksamhetens systemdesign måste följa denna utveckling för att vara konkurrenskraftig på IT-marknaden.Implementeringar av Service Oriented Architecture, förkortat SOA, har i många fall visat sig vara lönsamma investeringar till en modernare arkitektur. Denna rapport förklarar på vilka sätt SOA kan vara kostnadseffektivt för verksamheter, samt identifierar kritiska framgångsfaktorer som är avgörande vid systemskiften till SOA.I kombination av en teoretisk litteraturstudie, analys av publicerade företagsfall och empirisk undersökning visar sig SOA-baserade lösningar vara kostnadseffektiva genom sänkta kostnader, tidsbesparingar och snabbare produktutveckling. Studien identifierar huvudsakligen fem kritiska framgångsfaktorer som är direkt kopplade till hur pass kostnadseffektiv en implementering av SOA kan komma att bli. / In unity with the technological evolution the conditions for cost-effective IT environments also changes. In this context, the architecture of software systems is changing and the business system design has to follow this development in order to be competitive on the IT market.Implementations of Service Oriented Architecture, abbreviated as SOA, have in many cases proven to be profitable investments to a modern architecture. This thesis explains in which ways SOA may turn out to be cost-effective for companies, and identifies critical success factors that are crucial within a system transition to SOA.The combination of a theoretical literature study, analysis of published business cases and empirical studies provided a result in which SOA-based solutions was cost-effective by reduced costs, time savings and faster product development. The study identifies five main critical success factors which are directly related to how cost-effective an implementation of SOA may be.

Most epidemiological systems described in the literature are built for evaluation and analysis of specific diseases, such as Influenza-like-illness. The modeling environments that support these systems are implemented for specific diseases and epidemiological models. Hence they are not reusable or extendable. This thesis focuses on the design and development of an integrated analytical environment with flexible data integration methodologies and multi-level web services for evaluation and forecasting of various epidemics in different regions of the world. The environment supports analysis of epidemics based on any combination of disease, surveillance sources, epidemiological models, geographic regions and demographic factors. The environment also supports evaluation and forecasting of epidemics when various policy-level and behavioral interventions are applied, that may inhibit the spread of an epidemic. First, we describe data integration methodologies and schema design, for flexible experiment design, storage and query retrieval mechanisms related to large scale epidemic data. We describe novel techniques for data transformation, optimization, pre-computation and automation that enable flexibility, extendibility and efficiency required in different categories of query processing. Second, we describe the design and engineering of adaptable middleware platforms based on service-oriented paradigms for interactive workflow, communication, and decoupled integration. This supports large-scale multi-user applications with provision for online analysis of interventions as well as analytical processing of forecast computations. Using a service-oriented architecture, we have provided a platform-as-a-service representation for evaluation and forecasting of epidemics. We demonstrate the applicability of our integrated environment through development of the applications, DISIMS and EpiCaster. DISIMS is an interactive web-based system for evaluating the effects of dynamic intervention strategies on epidemic propagation. EpiCaster is a situation assessment and forecasting tool for projecting the state of evolving epidemics such as flu and Ebola in different regions of the world. We discuss how our platform uses existing technologies to solve a novel problem in epidemiology, and provides a unique solution on which different applications can be built for analyzing epidemic containment strategies. / Ph. D.

With rapid growth in the complexity of large scale engineering systems, the application of multidisciplinary analysis and design optimization (MDO) in the engineering design process has garnered much attention. MDO addresses the challenge of integrating several different disciplines into the design process. Primary challenges of MDO include computational expense and poor scalability. The introduction of a distributed, collaborative computational environment results in better utilization of available computational resources, reducing the time to solution, and enhancing scalability. SORCER, a Java-based network-centric computing platform, enables analyses and design studies in a distributed collaborative computing environment. Two different optimization algorithms widely used in multidisciplinary engineering design---VTDIRECT95 and QNSTOP---are implemented on a SORCER grid. VTDIRECT95, a Fortran 95 implementation of D. R. Jones' algorithm DIRECT, is a highly parallelizable derivative-free deterministic global optimization algorithm. QNSTOP is a parallel quasi-Newton algorithm for stochastic optimization problems. The purpose of integrating VTDIRECT95 and QNSTOP into the SORCER framework is to provide load balancing among computational resources, resulting in a dynamically scalable process. Further, the federated computing paradigm implemented by SORCER manages distributed services in real time, thereby significantly speeding up the design process. Results are included for an aircraft design application. / Master of Science