Made available in DSpace on 2014-06-12T15:59:38Z (GMT). No. of bitstreams: 2 arquivo5357_1.pdf: 4023431 bytes, checksum: 529e64a94dcf7762880f12bafed89834 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006 / A próxima revolução tecnológica, desde o surgimento da Internet, já está acontecendo e é um fenômeno denominado convergência digital. Impulsionado pelo desenvolvimento da computação pervasiva, em que dispositivos (celulares, PDAs, PCs), mídias (rádio, TV, jornal, Internet) e redes (celulares, Wi-Fi, TV digital) convergem, este processo está mudando a forma como cada um de nós interage com o ambiente através da tecnologia. Atualmente já existem dispositivos móveis com múltiplas interfaces de rede e, conseqüentemente, acesso a diversas fontes de dados, como Wi-Fi, Bluetooth, a rede celular e, mais recentemente, a rede de TV digital móvel. Estas diversas interfaces de rede geram um acesso desordenado a serviços remotos nos aparelhos móveis, complicando a experiência do usuário final, em vez de facilitá-la. O sistema de TV digital móvel, por si só, é um exemplo de uma tecnologia que agrega serviços de diversas redes, pois o conteúdo de áudio e vídeo é transmitido via rede broadcast, enquanto a interatividade é provida através de um canal unicast, como a rede celular, por exemplo. Como conseqüência dessa convergência de redes, tornou-se crucial para o desenvolvedor de aplicações, assim como para os usuários, que o acesso aos serviços remotos seja transparente da rede utilizada. Buscando prover esta transparência, portanto, é proposto neste trabalho um middleware para a convergência de serviços em TV digital móvel e redes sem fio, denominado middleconv, que possui mecanismos de descoberta, de execução e de monitoramento de serviços de aplicação disponíveis nas diversas interfaces de rede de um dispositivo móvel. Como estudo de caso, foi desenvolvida, e implantada em um ambiente real, uma aplicação de Electronic Service Guide convergente, na qual o usuário tem acesso aos serviços disponibilizados nas redes de TV digital móvel e nas intranets Wi-Fi, utilizando o middleware proposto

Context: Several examples of successful migrations of systems to Service Oriented Architecture (SOA) are presented in the literature. Some of the approaches also try to structure the process of migration to SOA. The reported migration attempts underline the role of architecture of migrated system, but they do not explore the architectural patterns applied in architecture of migrated systems while proper usage of patterns may simplify and improve quality of migration. Objectives: This work is aimed at elaborating guidelines that support migration from a system that is based on a chosen architectural pattern towards a system based on Service Oriented Architecture. Methods: Literature review is used as a basic method in the initial steps of the research, that is during investigation of existing techniques of migration to SOA, establishing procedure for selection of the migrated pattern and identifying building blocks of the target architecture. Results of the literature reviews are further analyzed in order to select the migrated architectural pattern and to elaborate the target architecture. The guidelines for migration are the result of the synthesis of the analyzed information. Results: The migration is realized as a translation between two pattern languages: the first pattern language describes the chosen architectural pattern–Model–View–Controller and the second pattern language describes SOA target architecture, expressed using SOA architectural patterns. The translation is defined by a set of migration guidelines. The approach is also illustrated with migrating an example student project. Conclusion: The study shows that the usage of an architectural pattern during migration allows to define the migration in a simple, structured and precise way using guidelines that represent a set of subsequent well defined steps that should be applied in order to migrate a specific type of legacy system.

SOA-based systems o er high degree of exibility and interoperabil- ity. However, the securing of SOA-based applications is still a challenge. Although some related techniques have been proposed and presented in academia and industry, it is still dicult to check SOA quality in security aspect from an architecture view. In this thesis project, a method for security analysis in SOA is intro- duced and investigated. The method intends to be used for analyzing security of SOA-based systems on architecture level. To demonstrate the method, a prototype supporting the method is introduced and imple- mented. And the method and prototype are also evaluated respectively based on Technology Acceptance Model. The evaluation result shows that the prototype supporting the method is a promising inspection tool to detect software vulnerability.

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The main topic of this thesis is the application of best practice methodology to the development of services in public administration and e-Government. The work focuses on interoperable services that can be integrated across departments of public administration or businesses in the private sector. In section 2 we describe the various aspects influencing the development of interoperable services in public administration using the European Interoperability Framework (EIF) as a basis for classifying interoperability dimensions. Section 3 evaluates current state of services in public administration focusing on information interoperability that addresses syntactic, structural and semantic heterogeneity. We have found that Services of Public Administration Portal (PVS) suffer from high levels of structural and syntactic heterogeneity, and we discuss possible ways to standardize service interfaces in public administration in order to improve interoperability. Creation of standardized library of services has been proposed as a possible way forward. In section 4 of the thesis we propose a methodological framework for the development of e-Government services using the best practices methods identified in the private sector domain. The main emphasis is placed on library services and its role in the lifecycle of services. Stages of lifecycle of services are decomposed into sub-phases so that they match phases in the MMDIS methodology.

This thesis focuses on design of document exchange solution used between Stavební spořitelna České spořitelny a.s. (SSČS) and its external sales network, which is outdated and doesn't meet the needs of SSČS or sales network. The thesis also includes the identification of suitable basic principles used in the service-oriented architecture (SOA) concept and their application in design solutions. The aim of the thesis is a conceptual solution design, based on the principles of SOA and the following technological design of changes in existing environment, so that on this basis could be created a functional and technical specification for suppliers of these applications. Stated objective is achieved through an initial analysis of the current environment, which identifies the possibilities of existing applications, and identifies weaknesses in the process that will be changed in the new solution. The analysis covers as the environment of external sales network as the related environment in SSČS, which together figure in the process of documentation exchange. As the results of the analysis and based on theoretical knowledge and consultation with experts in the field of SOA is then formulated a proposed solution at the conceptual level, which is further elaborated in the description of the proposed changes in individual components of the new solution. The outputs of this thesis will serve SSČS both in terms of describing the existing and the new environment, and as an input for the specifications of the proposed amendments to the supplier concerned applications. Structure of the thesis consists of introduction, devoted to the characterization of SSČS and providing an initial framework for solved domain. This is followed by a description and the analysis of external sales network, particularly in terms of application equipment and communication flows, followed by a description of the environment in SSČS, which contains the components processing sent documents. Next part of thesis is devoted to the formulation of the basic concepts of SOA and selection of appropriate principles that are followed in the subsequent section to draft the solution itself, first at the conceptual level, followed by a detailed description of the necessary changes. Everything is then evaluated in the final part.

The thesis deals with enterprise service bus (ESB). In theoretical part there are described ESB and other technologies relevant to this topic. Next there are described advantages and disadvantages of the deployment and mapped current market of ESB solutions. Last chap-ter briefly discusses other technologies recovered for the practical part. The second part deals with the design and implementation ESB using framework SwitchYard. I describe the systems to be integrated, further progress in the development such as preparation envi-ronment, server configuration and description of the most important parts of the developed system. The last chapter deals with the practical part of the evaluation framework. It in-cludes the description of the errors that I have encountered in the development and verbal evaluation on the basis of general ESB functionality described in the theoretical part.

Service Oriented Architecture (SOA) is an architecture which provides a single topology for business applications. SOA provides architecture for integration of several applications within or outside of organizations by reusing application components and services. Reusability is one of the mostly emphasized principles and benefits of SOA. Code reusing has been a concern for application developers. However, another way of reusability is reusing software components and services in SOA. By reusing services, a service can be used in more than one business process of service application. By considering the significance of reusability in SOA, a number of studies have been performed, to theoretically identify the factors affecting reusability in SOA. However, a research is needed to perform an empirical research to identify a set of factors affecting reusability in real business situation. The empirical study is performed by an investigation in three different companies in Sweden, which have been customers of a system integration company and have implemented SOA projects. The investigation is done by performing 5 semi-structured interviews with correspondences of those companies, to find more factors affecting reusability from their perspective. As a result, a set of factors derived from the empirical study is identified which reflects the ideas of practitioners in business. By performing a qualitative approach and comparing the factors derived from the empirical study to factors derived from literature study, it is concluded that academic factors constitute just around 40 percent of factors found in business, and they are mostly technical factors. The rest of factors are new factors based on experience of practitioners in business. The new factors are mostly business oriented factors, and have emerged since 2008, when earlier works are performed. Due to the recent maturity of SOA in organizations, the factors affecting reusability have changed, especially during the last four years.

A spatial soliton is a shape invariant self guided beam of light or a self induced waveguide. Spatial solitons appear as a result of the balance of diffraction and nonlinear focusing in a system. They have been observed in many different conservative media in the last couple of years. Solitons are ubiquitous, because of the probability of using their interactions in optical data processing, communications etc. Up to now due to the power required to generate the solitons, and the response times of the soliton supporting media, these special waves of nature could not penetrate the applications arena. Semiconductors, with their resonant nonlinearities, are thought to be ideal candidates for fast switching, low power spatial solitons. In this dissertation it is shown theoretically and experimentally that it is possible to observe stable spatial solitons in a periodically patterned semiconductor optical amplifier (PPSOA). The solitons have unique beam profiles that change only with system parameters, like pumping current, etc. Their coherent and incoherent interactions which could lead to all optical devices have been investigated experimentally and theoretically. The formation of filaments or modulational instability has been studied theoretically and yielded analytical formulae for evaluating the filament gain and the maximum spatial frequencies in PPSOA devices. Furthermore, discrete array amplifiers have been analyzed numerically for discrete solitons, and the prospect of using multi peak discrete solitons as laser amplifiers is discussed.

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