The aim of the thesis is to design a web services architecture that shall support the automatic determination of a personalised sensor-system, which is embedded in smart garments, and which shall be used in self-care in order to allow a profane user to record himself a personal electrocardiogram (ECG), at anytime and anywhere. The main challenge consists in the intelligent and dynamic orchestration of context-aware business services that supply the user with an optimal personalised solution, while mastering the system's complexity: context dependent user and system interactions, knowledge extraction from subject-specific vital signs, services reconfiguration automation. The solution to this challenge is to create an Ambient Intelligence which goes beyond Ubiquitous Computing and is capable to replace an expert by proposing an Intelligent Assistance to any citizen. We propose a methodology expressed in terms of Data and Model driven Service Oriented Architecture (DM-SOA), which provides a framework for the production of context-aware intelligent business services. This architecture supports the automation of sophisticated and personalised expert activities, which apply professional knowledge to process an individual case. The proposed solution is based on a new dynamic business process modelling approach and in its implementation via automatically reconfigurable services. It consists in setting-up an intelligent environment based on a business process ontology of context-aware concepts and on related context handling rules for services orchestration. A core-ontology has been designed to support the automation of expert activities related to decision-making. The soundness of the method and of the underlying decision-making techniques has been demonstrated in the cardiology domain for selecting the most adequate subject-specific sensor-system, characterised by its ability to yield for an ECG signal of similar diagnostic content than a standard 12-lead ECG. We propose the design of a new three modalities sensor-system prototype as a response to the need of sensor-systems used on demand in self-care situations and ensuring diagnostic quality signals recordings. This prototype has been tested on a set of healthy volunteers presenting various characteristics in age, sex and morphology. In this context, Ambient Intelligence is demonstrated as an ensemble of professional quality services ready to use by profane users. These services are accessible pervasively, trough the objects people work with / wear on / use each day, and provide an appropriate guidance to the non-competent users. Such an Ambient Intelligence approach strongly supports the vision of an Information Society which corresponds to the long-term goal of the EU Information Society Technologies Research Programme that aims to ease knowledge access. The future healthcare will benefit from this approach and will significantly improve patient care.

Šiuolaikinio verslo sektorius yra labai sudėtingas, kadangi daugybė programinės ir kompiuterinės įrangos yra naudojama skirtingose platformose: internetinių sistemų bendravimui, verslo sistemų integravimui ir t. t. Dauguma šiuolaikinės programinės įrangos priklauso paskirstytų sistemų tipui. Ją sudaro kliento-serverio architektūra. Nagrinėjant konkrečią paskirstytą sistemą, joje klientų ir serverių kiekis gali būti gausus. Tokio tipo sistemos turi labai daug privalumų, tačiau turi ir trūkumų. Paprastai paskirstytas sistemas sudaro ne viena duomenų bazė, veikia daug servisų, kurie ne visada gali būti pasiekiami, visa tai yra galimų klaidų šaltinis. Kliento programinė įranga bendrauja tarp įvairių programinės įrangos komponentų (pavyzdžiui servisų), kaip ir jie tarpusavyje, naudodama nuotolinių procedūrų kvietimo technologijas ir žinutes. Naudojant žinučių technologiją, bendravimas tarp servisų gali būti daug patikimesnis, kadangi ši technologija užtikrina žinutės pristatymą, net ir tada, kai gavėjas yra už ryšio ribų. Šiuolaikinėse servisais paremtose sistemose, bendravimas tarp komponentų yra paremtas žinučių, naudojančių eiles, metodu. Šiame darbe bus nagrinėjama bendravimo tarp komponentų technologija, kuri paremta žinutėmis. Taip pat bus apžvelgiamos ir nagrinėjamos trečių šalių sukurtos, nemokamos technologijos, kurios skirtos bendravimui tarp paskirstytų sistemų komponentų žinučių metodu. Kadangi magistrinio darbo sistema buvo sukurta naudojant Microsoft technologijas... [toliau žr. visą tekstą] / Nowadays a lot of systems are residing in distributed environments. These systems are composed of the client side software and server side software. That is called distributed systems architecture. Those types of systems can contain many services and many clients and may be substituted of many databases and many services. Distributed software components do not always run at the same time, networks, especially wide-area networks, are not always available and reliable. These parts communicate using remote procedure calls, or request/response messages and message queues. In this work we research third party components which are used to communicate between parts of distributed systems using messages and Microsoft message queues. The research is performed on two chosen components, which best fits in the developed system’s context. The choice of components and research based on usability problems using developed system called Business layer framework. The obtained results evaluated using user recommendation form.

No description available.

目前對於新巴塞爾協定的內部評量法，相關機構與學者都有進行研究，也發展出眾多不同的信用風險模型，但是對於金融機構而言如何分析各階段所需要的資訊，並透過資訊科技彈性的選擇相關方法，在眾多方法中尋找出真正符合銀行內部需求的評估模型，並且在授信的過程中將許多分散在不同資訊系統的資訊藉由一個有效的資訊架構，適時的提供給主管人員作為評估審核的決策依據，以及控管流程的進行，最後更進一步的計提資本，以符合新巴塞爾協定的規範，是目前金融機構最重要的課題。 因此本研究發展一套服務導向架構的系統平台，將符合新巴塞爾規範下信用風險模型使用的過程與方法以網路服務的方式模組化，銀行可以藉由系統平台所提供的流程架構，搜尋符合新巴塞爾協定的信用風險模型並加以測試與使用。本研究並以一般銀行企業貸款的流程為基礎，提出一個資訊架構來建構銀行企業貸款控管流程，並建置一套企業線上貸款雛型系統，將授信人員所需資訊，透過系統化的方式呈現出來以作為決策的參考，並透過信用風險模組計算其違約機率，最後計算此貸款所需計提的資本，以符合新巴塞爾協定規範。 / Several related institutes and scholars have been researched and developed various credit risk models based on the internal ratings based approach of New Basel Capital Accord. However, for finance corporations, how to analyze the information required for every stage, select relevant methods flexibly through information technology, find manners that really match the evaluation model required for banks, then provide managers the estimative examine to stand on decision properly by establishing an effective information construction from scattered different information system during trust. Furthermore, proposing the capital to fit New Basel Capital Accord is the most important issue for finance corporations. Therefore, this research develops a systematic platform based on Service-Oriented Architecture (SOA) and modulates the processes and methods used for credit risk models that match New Basel Capital Accord by Web Services; thus, banks can test and use the credit risk model that matches New Basel Capital Accord by searching the process framework provided by systematic platform. This research is also based on the loan procedure of general corporate lending and proposes a systematic framework to build up the control process for corporate lending. Moreover, by establishing a system for online corporate lending, the information required for trustees can be presented as indications of decision through systematization, and calculates the proposed capital required for the loan by counting the default probability via credit risk model to fit New Basel Capital Accord.

O processo de definição de preços de venda é crítico para o sucesso competitivo das organizações. E a não existência de sistemas ERP gratuitos que implementem diversos métodos de precificação criam um contexto de deficiência de ferramentas que auxiliemos gestores com esta necessidade. O Grupo de Pesquisa em Sistemas de Informação (GPSI) da Universidade Tecnológica Federal do Paraná, Campus Ponta Grossa, esta desenvolvendo um aplicativo denominado FrameMK (Framework para Definição de Preço de Venda). Assim este trabalho teve por objetivo principal demonstrar o uso de diversos métodos de precificação, por meio do framework de definição de preço de venda - FrameMK em sistemas ERP gratuitos, independentemente da sua plataforma, por intermédio de arquitetura de camada de serviços. Foram utilizadas ferramentas e métodos de desenvolvimento de software para atingir o objetivo, dentre eles a linguagem de modelagem UML e a linguagem de programação Java. As etapas do trabalho se deram inicialmente pelo estudo do framework seguido pela implementação de serviços de exposição direta dos métodos de precificação implementados. A partir deste ponto realizou-se a descrição dos requisitos de serviços e recursos de alto nível que auxiliaram na etapa de implementação dos serviços Web utilizando as tecnologias SOAP/WSDL e REST. Desta forma, os principais resultados obtidos foram: modelos de projeto dos três níveis de serviço. Modelos para implantação do FrameMK e casos de uso utilizados como base para a descrição de requisitos para o desenvolvimento das funções do terceiro nível de serviços. O produto de software que implementa as classes de serviço resultante em uma arquitetura orientada a serviço para o FrameMK, conjuntos de testes unitários de código e a sua implantação nos servidores do Grupo de Pesquisa em Sistemas de Informação da Universidade Tecnológica Federal do Paraná, Campus Ponta Grossa. Os sistemas ERP: webERP, OpenBravo e OpenERP foram trabalhados para demonstração da aplicação dos serviços e resultaram em versões integradas com o framework. Com estas versões os gestores de negocio beneficiam-se com a melhoria do processo de precificação de seus produtos e serviços. / The sales price definition process is critical for competitive success of organizations. The lack of free ERP systems that implement several pricing methods create a context when managers need of tools that assist then in this task. The Research Group on Information Systems at Federal Technological University of Parana, Campus Ponta Grossa, is developing an application called FrameMK (Framework for Sales Price Definition). Thus, this work has as it’s main goal to demonstrate the use of various pricing methods, through the framework for sale price definition - FrameMK, in free ERP systems, through a service oriented architecture layer. Tools were used and methods of software development to achieve the goal, including UML modeling language and the Java programming language . The stages performed started with the study of the framework followed by the implementation of direct exposure services of pricing methods implemented. From this point there was the description of the service requirements and high-level features that assisted in the implementation stage of the Web services using the technologies SOAP / WSDL and REST. Therefore, the main results were: design models of the three levels of service. Models for deployment FrameMK and use cases as the basis for the description of requirements for the functions development of the third level services. The software product that implements the service classes resulting in a service-oriented architecture for FrameMK, sets of unit testing code and its deployment on the servers of the Research Group on Information Systems at Federal Technological University of Parana, Campus Ponta Grossa.

L'informatique pervasive promeut une vision d'un cadre dans lequel un patchwork de ressources hétérogènes et volatiles est intégré dans les environnements du quotidien. Ces ressources, matérielles ou logicielles, coopèrent de manière transparente, souvent aux travers d'applications, pour fournir des services à haute valeur ajoutée adaptés à chaque utilisateur et son environnement, grâce à la notion de contexte. Ces applications sont déployées dans un large spectre d'environnements d'exécution, allant d'infrastructures distantes de Cloud Computing jusqu'au plus près de l'utilisateur dans des passerelles Fog Computing ou directement dans les capteurs du réseau. Dans ces travaux, nous nous intéressons spécifiquement au module de contexte d'une plateforme Fog Computing. Pour faciliter la conception et l'exécution des applications Fog Computing, une approche populaire est de les bâtir au dessus d'une plateforme adoptant l'architecture à service, ce qui permet de réduire leur complexité et simplifie la gestion du dynamisme. Dans nos travaux, nous proposons d'étendre cette approche en modélisant le contexte comme un ensemble de descriptions de services, disponible à la conception, et exposé dynamiquement par le module de contexte à l'exécution, selon les besoins des applications et l'état de l'environnement. Ce module est programmé à l'aide d'un modèle à composant spécifique. L'unité de base de notre modèle à composant est l'entité de contexte, qui est composé de modules hautement cohérents implémentant distinctement les spécifications des services proposées par l'entité de contexte. Ces modules peuvent décrire de manière simple leur logique de synchronisation avec les sources de contexte distantes grâce à un langage dédié à ce domaine. A l'exécution, les instances d'entitées de contexte sont rendues introspectables et reconfigurables dynamiquement, ce qui permet, grâce à un manager autonomique externe, de veiller à la satisfaction des besoins des applications. Nous avons développé une implémentation de référence de ce modèle à composant, nommée CReAM, qui a pu être utilisée dans la passerelle domotique iCASA, développée en partenariat avec Orange Labs. / Pervasive computing promotes environments where a patchwork of heterogeneous and volatile resources are integrated in places of daily life. These hardware and software resources cooperate in a transparent way, through applications, in order to provide high valueadded services. These services are adapted to each user and its environment, via the notion of context. Pervasive applications are now widely distributed, from distant cloud facilities down to Fog Computing gateway or even in sensors, near the user. Depending on the localization, various forms of context are needed by the applications. In this thesis, we focus on the context module at Fog Level. In order to simplify the design and execution, Fog applications are built on top of a service-oriented platform, freeing the developer of technical complexity and providing a support to handle the dynamism. We propose to extend this approach by providing the context as a set of service descriptions, available at design to the application developer. At runtime, depending on the context sources availability and on application current needs, context services are published or withdrawn inside the platform by the context module. We tailor a specific component model to program this context module. The base unit of our component model is called context entity. It is composed of highly coherent modules, implementing distinctly each service description proposed by the underlying context entity. These modules can simply describe their synchronization logic with context sources thanks to a domain specific language. At runtime, context entity instances can be introspected and reconfigured. An external autonomic manager uses these properties to match dynamically the context services exposed by the context module to the application needs. We have developed a reference implementation of our work, called CReAM, which can be used in a smart home gateway called iCASA, developed in a partnership with Orange Labs.

La croissante complexité du logiciel a mené les chercheurs en génie logiciel à chercher des approcher pour concevoir et projéter des nouveaux systèmes. Par exemple, l'approche des architectures orientées services (SOA) est considérée actuellement comme le moyen le plus avancé pour réaliser et intégrer rapidement des applications modulaires et flexibles. Une des principales préocuppations des solutions en génie logiciel et la réutilisation, et par conséquent, la généralité de la solution, ce qui peut empêcher son application dans des systèmes où des optimisation sont souvent utilisées, tels que les systèmes temps réels. Ainsi, créer un système temps réel est devenu très couteux. De plus, la plupart des systèmes temps réel ne beneficient pas des facilités apportées par le genie logiciel, tels que la modularité et la flexibilité. Le but de cette thèse c'est de prendre en compte ces aspects temps réel dans des solutions populaires et standards SOA pour faciliter la conception et le développement d'applications temps réel flexibles et modulaires. Cela sera fait à l'aide d'un modèle d'applications temps réel orienté composant autorisant des modifications dynamiques dans l'architecture de l'application. Le modèle de composant sera une extension au standard SCA qui intègre des attributs de qualité de service sur le consomateur et le fournisseur de services pour l'établissement d'un accord de niveau de service spécifique au temps réel. Ce modèle sera executé sur une plateforme de services OSGi, le standard de facto pour le developpement d'applications modulaires en Java. / The increase of software complexity along the years has led researchers in the software engineering field to look for approaches for conceiving and designing new systems. For instance, the service-oriented architectures approach is considered nowadays as the most advanced way to develop and integrate fastly modular and flexible applications. One of the software engineering solutions principles is re-usability, and consequently generality, which complicates its appilication in systems where optimizations are often used, like real-time systems. Thus, create real-time systems is expensive, because they must be conceived from scratch. In addition, most real-time systems do not beneficiate of the advantages which comes with software engineering approches, such as modularity and flexibility. This thesis aim to take real time aspects into account on popular and standard SOA solutions, in order to ease the design and development of modular and flexible applications. This will be done by means of a component-based real-time application model, which allows the dynamic reconfiguration of the application architecture. The component model will be an extension to the SCA standard, which integrates quality of service attributs onto the service consumer and provider in order to stablish a real-time specific service level agreement. This model will be executed on the top of a OSGi service platform, the standard de facto for development of modular applications in Java.

Made available in DSpace on 2016-06-02T19:05:40Z (GMT). No. of bitstreams: 1 2816.pdf: 3634540 bytes, checksum: 6fe824000d56b37505cefb028fae6be1 (MD5) Previous issue date: 2009-10-27 / Universidade Federal de Minas Gerais / Difficulties in learning how to read and write might bring serious jeopardy to students progression in school. Researches focusing teaching methods for individualized application, based on the paradigm of stimulus equivalence, show that it is possible to significantly improve learning of reading and other skills Although they present good results, these methods have limited range, because the presence of a tutor is not always possible or economically viable. Besides, authoring and management of learning programs based on these methods are complex and demand training of tutors and specialists. Some results have already been reached concerning to informatization, though the solutions presented offer little flexibility, since they focus on teaching topics that are either too specific or too broad, which requires complementary effort for its effective usage. This dissertation explores and evaluates software engineering and distributed computing techniques in an attempt to find a solution that might diminish costs involved in the creation, application and management of individualized programs, besides allowing large scale diffusion of teaching through these methods. A software infrastructure that allows these objectives is proposed, composed by an architecture, modules to perform specific tasks, and recommendations on some patterns of architecture, project and interface in order to help the development or adaptation of new modules. In order to maximize the installed base of the developed modules and also to benefit a larger number of students, the solution promotes interoperability of Web applications, mobile devices and interactive digital television. Aiming the validation of the proposed infrastructure and also to offer an operational codification to the problem of computerized individualized learning, a modular system named GEIC was developed and deployed, being used by researchers of several universities. Despite the initial motivation of this work to offer an infrastructure for the creation of systems specific for teaching reading and writing, the solution proposed here is very broad in scope and supports other domains and learning paradigms. / No processo educacional dificuldades com a alfabetização podem acarretar sérios prejuízos à evolução acadêmica do aluno. Pesquisas com métodos de ensino para aplicação individualizada, baseados no paradigma de equivalência de estímulos, mostram que é possível melhorar significativamente a aprendizagem de leitura com compreensão (e de outras habilidades). Embora apresentem bons resultados, esses métodos têm sua abrangência limitada, pois a participação presencial de um tutor nem sempre é possível ou economicamente viável. Além disso, a autoria e gerenciamento de programas de ensino baseados nesses métodos são complexos e exigem o treinamento de tutores e especialistas de domínio. Alguns resultados já foram alcançados no sentido de informatizar esse processo, porém as soluções apresentadas oferecem pouca flexibilidade, pois são voltadas para o ensino de um assunto específico ou são muito genéricas, exigindo esforço complementar para sua efetiva utilização. Nesta dissertação são exploradas e avaliadas técnicas de engenharia de software e computação distribuída na busca de uma solução que possa proporcionar a redução dos custos envolvidos na criação, aplicação e gerenciamento de programas de ensino individualizados, além de permitir a difusão em larga escala do ensino através desses métodos. É proposta uma infra-estrutura de software que viabiliza a realização desses objetivos, composto de uma arquitetura, módulos para realização de tarefas específicas, e recomendações de padrões de arquitetura, projeto e interface para auxiliar no desenvolvimento ou adaptação de novos módulos. Com o objetivo de maximizar a base instalada dos módulos desenvolvidos e também de permitir que um maior número de alunos seja beneficiado, a solução promove a interoperabilidade de aplicações de ambiente Web, dispositivos móveis e de TV Digital Interativa. A fim de validar a infra-estrutura proposta e também de oferecer uma codificação operacional ao problema do ensino individualizado por computador, foi desenvolvido um sistema modular chamado GEIC, já implantado e em uso por pesquisadores de várias universidades. Apesar da motivação inicial deste trabalho ter sido oferecer uma infra-estrutura para a criação de sistemas para o ensino de escrita e leitura, a solução proposta é bastante abrangente e suporta outros domínios e paradigmas de ensino.

Made available in DSpace on 2016-06-02T19:06:05Z (GMT). No. of bitstreams: 1 5226.pdf: 3993089 bytes, checksum: a0750877fc955b7274271f1326ade7b3 (MD5) Previous issue date: 2011-08-24 / One of the benefits of Service-Oriented Architecture is to make business processes adaptable when this architecture is adopted during software development. For reaching this purpose, it is essential to have a support for services identification in order to meet the business goals. However, many available services found on web environment are too specific and can hardly be reused in different applications. This happens because there is a lack of systematic approaches for supporting generic services identification in a systematic way. Objective: Presenting a strategy for identifying generic services that support business processes. The identification is supported by Goal Diagrams and Business Process Models and is composed by a set of guidelines which assist the domain engineer in extracting the services. The identified services are generic enough to be reused in similar applications of a specific domain. Methodology: To elaborate our strategy, some domain-specific business process were analyzed, aiming at extracting key tasks and turn them into generic web services. This analysis was supported by an extended version of goal diagrams (GTR) and conventional BPM models. Results: As a proof-of-concept we applied our strategy for identifying services in the planning processes domain and we developed a real e-gov web portal based on the identified services. The web portal was used successfully by two different schools for elaborating their planning processes. Conclusion: We claim that our strategy is generic and can be applied to other business processes providing software suitability to the organization dynamics, besides the potential reuse of services in different instances of the same business process. / Um dos benefícios da Arquitetura Orientada a Serviços é tornar os processos de negócios adaptáveis quando esta arquitetura é adotada durante o desenvolvimento de software. Para atingir este propósito, é essencial ter um suporte para a identificação de serviços a fim de atender os objetivos de negócio. No entanto, muitos serviços disponíveis encontrados no ambiente web dificilmente podem ser reutilizados em diferentes aplicações. Isso acontece porque faltam abordagens sistemáticas de apoio à identificação de serviços genéricos de uma forma sistemática. Objetivo: Apresentar uma estratégia para identificar serviços genéricos que dêem suporte aos processos de negócios. A identificação é apoiada por diagramas de objetivos e modelos de processos de negócios, e é composto por um conjunto de diretrizes que auxiliam o engenheiro de domínio na extração dos serviços. Os serviços identificados são genérico o suficiente para serem reutilizados em aplicações semelhantes de um domínio específico. Metodologia: Para elaborar a nossa estratégia, um processo de negócio específico de domínio foi analisado, com o objetivo de extrair tarefas chaves deste processo e transformá-las em serviços web genéricos. Esta análise foi apoiada por uma versão estendida de diagramas de objetivos (GTR) e modelos BPM convencionais. Resultados: Como prova de conceito, aplicamos a nossa estratégia para a identificação de serviços no domínio do processo de planejamento e desenvolvemos um portal web real com base nos serviços identificados. O portal foi utilizado com sucesso por duas escolas diferentes para a elaboração de seus processos de planejamento. Conclusão: Afirmamos que nossa estratégia é genérica e pode ser aplicada a outros processos de negócios provendo a adequação do software à dinâmica organização, além do potencial de reúso de serviços em diferentes instâncias do mesmo processo de negócio.

Submitted by Livia Mello (liviacmello@yahoo.com.br) on 2016-09-23T18:25:13Z No. of bitstreams: 1 DissIMF.pdf: 12997797 bytes, checksum: 61ca28804fe846c5e4f1f3d97a366017 (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-10T14:23:42Z (GMT) No. of bitstreams: 1 DissIMF.pdf: 12997797 bytes, checksum: 61ca28804fe846c5e4f1f3d97a366017 (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-10T14:23:49Z (GMT) No. of bitstreams: 1 DissIMF.pdf: 12997797 bytes, checksum: 61ca28804fe846c5e4f1f3d97a366017 (MD5) / Made available in DSpace on 2016-10-10T14:23:59Z (GMT). No. of bitstreams: 1 DissIMF.pdf: 12997797 bytes, checksum: 61ca28804fe846c5e4f1f3d97a366017 (MD5) Previous issue date: 2015-11-13 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / The popularization of mobile devices capable of communicating via wireless network technologies allows us to consider different scenarios in which these devices may autonomously interact with each other. The envisioned communications would occur in a P2P fashion, as each device could simultaneously provide and consume services. A mechanism for dynamically discovering nearby devices and the available services would be necessary. Although a few existing applications already provide the direct interaction among devices they are purpose-specific and rely on pre-configured information for identifying other devices. A service-oriented architecture (SOA), based on HTTP requests and the REST or SOAP protocols, is commonly used in this type of communication. However, automatically finding available known services is still challenging. Service discovery is usually based exclusively on service name, which is not very flexible. This work proposes a new model for the direct interaction between computing devices. In an attempt to facilitate service discovery and selection we propose a content centric model in which interactions are defined according to an object’s type and the action to be applied to it. The proposed approach can workatop of existing discovery protocols, based on extensible metadata fields and on existing service data. Our proposal is evaluated according to i) the viability of direct communication between nearby devices, even when carried by users or associated to vehicles; ii) the proposed service discovery and matching using the content centric approach; iii) the effectiveness of a middleware to support the development of generic applications for direct device communication. Simulation results show our proposed model is viable. A preliminary implementation of the middleware was also evaluated and the results show that spontaneous, opportunistic, service-based interactions among devices can be achieved for different types of services. / A popularização de dispositivos móveis dotados de capacidade de comunicação sem fio possibilita a criação de ambientes onde estes dispositivos interagem diretamente entre si. Essas comunicações ocorrem no modelo P2P, de forma que cada dispositivo pode implementar simultaneamente papéis de cliente e de servidor. Contudo, para que ocorram interações di- retas entre dispositivos através de aplicações, é preciso que estes dispositivos implementem algum mecanismo de descoberta. Atualmente, a maioria das aplicações que se comunicam diretamente utilizam informações pré-configuradas para identificação de dispositivos e serviços. Uma forma utilizada para interação entre dispositivos é através da oferta e consumo de serviços utilizando a arquitetura orientada a serviços (SOA), baseada em requisições HTTP utilizando os padrões REST ou SOAP. Um problema recorrente para consumidores de serviços é a identificação de serviços disponíveis. A identificação utilizada em protoco- los de descoberta existentes baseia-se apenas no nome do serviço, salvo em comunicações pré-configuradas, o que não apresenta flexibilidade para descobrir novos serviços. De forma a facilitar a troca de informações entre dispositivos, este trabalho propõe um modelo em que interações diretas entre dispositivos sejam centradas no conteúdo envolvido na interação e nas ações que se deseja realizar sobre eles. Para tanto, uma identificação de serviço pode ser baseada em metadados que são adicionados às descrições de serviços existentes, ou em informações obtidas com protocolos de descoberta de serviço existentes. Para avaliar o modelo proposto, esse trabalho apresenta um estudo sobre i) a viabilidade de interações diretas entre dispositivos, considerando suas mobilidades; ii) o uso de um modelo de interação centrado em conteúdo e ação; iii) o desenvolvimento de um Middleware para simplificar o desenvolvimento de aplicações que usem o modelo de serviço proposto. Os resultados de simulação obtidos mostram que o modelo é viável. Além disso, uma versão preliminar do Middleware proposto foi avaliada e mostra que a interação direta entre dispositivos pode ocorrer de forma oportunística e espontânea.