Abstract not available

La reconfiguration dynamique d'un logiciel peut être un auxiliaire utile pour adapter et maintenir des systèmes informatiques. Dans la plupart des approches, le système doit être interrompu pour que la reconfiguration puisse être exécutée. Cette interruption ne peut convenir aux systèmes temps-réel : il est nécessaires que les contraintes temporelles soient respectées, même lorsque le système est en train d'être reconfiguré.<br />Notre approche se base sur OSA+, un middleware temps-réel. Notre objectif principal est d'être capable de reconfigurer un (ou plusieurs) service lorsque le système est en fonction, avec un temps de non-réponse prévisible et prédéfini, c'est-à-dire un temps pendant lequel le système ne réagit pas à cause de la reconfiguration.<br />Trois approches différentes concernant le blocage ou le non-blocage d'un service sont présentées. Ces approches peuvent être utilisées pour réaliser un compromis entre le temps de reconfiguration et le temps de non-réponse.

Component Based Development has emerged as economical, reusable, scalable way of developing enterprise as well as embedded software applications. Testing distributed component based systems is difficult when third party components are being used in the development. Many testing methodologies that have been proposed for testing object oriented programs in the literature are being imported into component domain directly or by tuning them. But testing components involves much manual work due to the lack of information of the component. Middleware architectures like, DCOM(Distributed COM), Jini and CORBA(Common Object Request Broker Architecture) are being used in developing the distributed component applications in different vertical domains. In this thesis, a language- Distributed Object Testing Language(DOTL) for specifying the testing process and generation of distributed testing environment for CORBA based applications has been proposed. The language captures required semantics for specifying dummy servers, clients, controlling the testing process, generation of test cases, activating and deactivating objects. Many existing testing techniques can be specified using the semantics provided by the language. Faults occurring in distributed object systems, in addition to the functional errors, can be identifiable using the tool. The language provides abstract types object, argument to specify variables in the testing environment, and operations dealing with these variables to conducts necessary tests. The DOTL has been implemented on MICO(Mico Is CORBA) orb on Linux OS, with mapping of DOTL to CORBA C++.

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. / Made available in DSpace on 2012-10-17T11:08:56Z (GMT). No. of bitstreams: 0Bitstream added on 2014-09-25T18:34:58Z : No. of bitstreams: 1 174349.pdf: 2604061 bytes, checksum: e84f9d7f7621eda4890aaf35ad19c64e (MD5) / Este trabalho explora a gerência de segurança no âmbito de gerenciamento de sistemas distribuídos. Nesse contexto um mecanismo de autenticação e de autorização foi implementado. A implementação considera as tecnologias da Internet (Java, WWW and Applet Java) e sistemas distribuídos baseados em objetos distribuídos segundo o OMG-CORBA (Object Management Group - Common Object Request Broker Architecture). O mecanismo implementado foi validado pela sua aplicação no protótipo SETWeb (Sistema de Extrato Telefônico via Web) que faz parte do SSTCC ( Sistema de Segurança para Telecomunicação Contra Clonagem de Celulares ).

The way in which application systems and software are built has changed dramatically over the past few years. This is mainly due to advances in hardware technology, programming languages, as well as the requirement to build better software application systems in less time. The importance of mondial (worldwide) communication between systems is also growing exponentially. People are using network-based applications daily, communicating not only locally, but also globally. The Internet, the global network, therefore plays a significant role in the development of new software. Distributed object computing is one of the computing paradigms that promise to solve the need to develop clienVserver application systems, communicating over heterogeneous environments. This study, of limited scope, concentrates on one crucial element without which distributed object computing cannot be implemented. This element is the communication software, also called middleware, which allows objects situated on different hardware platforms to communicate over a network. Two of the most important middleware standards for distributed object computing today are the Common Object Request Broker Architecture (CORBA) from the Object Management Group, and the Distributed Component Object Model (DCOM) from Microsoft Corporation. Each of these standards is implemented in commercially available products, allowing distributed objects to communicate over heterogeneous networks. In studying each of the middleware standards, a formal way of comparing CORBA and DCOM is presented, namely meta-modelling. For each of these two distributed object infrastructures (middleware), meta-models are constructed. Based on this uniform and unbiased approach, a comparison of the two distributed object infrastructures is then performed. The results are given as a set of tables in which the differences and similarities of each distributed object infrastructure are exhibited. By adopting this approach, errors caused by misunderstanding or misinterpretation are minimised. Consequently, an accurate and unbiased comparison between CORBA and DCOM is made possible, which constitutes the main aim of this dissertation. / Computing / M. Sc. (Computer Science)

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico / Made available in DSpace on 2012-10-18T18:56:22Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-09T04:31:17Z : No. of bitstreams: 1 177491.pdf: 7142788 bytes, checksum: e40954b2aae4c3d0ca10a211dd1a2366 (MD5) / Este trabalho apresenta um estudo de plataformas para o desenvolvimento de aplicações distribuídas,em particular as arquiteturas CORBA e DCOM. O objetivo perseguido neste estudo é a realização de um aplicativo sobre ambas arquiteturas, visando observar os seus desenvolvimentos diante de uma situação real

Orientador: Eleri Cardozo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-07-26T08:33:51Z (GMT). No. of bitstreams: 1 Oliveira_EduardoJacob_M.pdf: 7451976 bytes, checksum: be31a9be0d9d9c5f7aaa369f9c4010aa (MD5) Previous issue date: 1999 / Resumo: Nos últimos anos o mercado de telecomunicações tem passado por mudanças profundas devido a fatores como desregulamentação, aumento da competição entre as operadoras e aumento da demanda para o oferecimento de novos serviços, mais avançados e complexos. Entretanto, a introdução desses novos serviços, no âmbito de telecomunicações, encontra uma forte barreira em uma infra-estrutura que tem sido voltada para a conexão de usuários, e não para o oferecimento de serviços. O consórcio TINA (Telecommunications Information Networking Architecture) define uma arquitetura de sojtware para serviços de telecomunicações, norteada por conceitos de "re-uso" de componentes de sojtware, transparência de distribuição e utilização de padrões abertos, visando o desenvolvimento e gerência de serviços de qualquer complexidade. Por sua vez, o crescimento da World Wide Web (WWW) na Internet, a partir de meados desta década, popularizou o uso dos browsers Web no acesso aos serviços de informação e comunicação, tornando-os padrão de facto para a interface e interação com o usuário, assim como peça-chave no desenvolvimento de aplicações. Este trabalho apresenta uma arquitetura para acesso a serviços de telecomunicações baseada nos conceitos da Arquitetura de Serviço TINA e implementada utilizando as tecnologias Web e de objetos distribuídos, por meio de uma plataforma CORBA (Common Object Request Broker A rchitecture ). ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital / Abstract: The telecommunications market has experienced dramatic changes pushed by factors such as deregulation, competition between operators, and the increasing demand for more advanced and complex services. However, the introduction of these new services is limited by the current telecommunications infrastructure, that was designed to connect end users, not to offer services to them. The Telecommunications Information Networking Architecture (TINA) consortium defines acommon software architecture for providing telecommunications services, using concepts of "reuse" of software components, distribution transparency, and open standards, and aiming at the implementation and management of services of any complexity. On the other hand, the explosion of the World Wide Web (WWW) in the Internet since the middle of the 90's has popularized the Web browsers as an access mechanism to information and communication services. Web browsers have become the de facto standard for interfacing and interacting with the user and a key tool for. the development of applications. ...Note: The complete abstract is available with the full electronic digital thesis or dissertations / Mestrado / Mestre em Engenharia Elétrica

Orientador : Eleri Cardozo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-07-28T22:47:43Z (GMT). No. of bitstreams: 1 Bosnardo_RaquelCristina_M.pdf: 5414563 bytes, checksum: 544795dcf9e396a0241a2e0bb1dfee6c (MD5) Previous issue date: 2001 / Resumo: Este trabalho descreve o desenvolvimento de um sistema de videoconferência para redes de alto desempenho, que pode ser integrado em sistemas de educação a distância os quais necessitam desta funcionalidade. O sistema é portável, não proprietário e distribuído e permite a interação entre professor e estudante (em um ambiente de educação a distância) através de transmissões em áudio e vídeo, e através de notificações por eventos. Para a implementação, foram utilizadas a arquitetura CORBA (Common Object Request Broker Architecture) e a linguagem Java. Dois serviços CORBA foram empregados: AIV Streams para o transporte da mídia contínua e o Serviço de Eventos para a notificação de eventos. O projeto e desenvolvimento utiliza tecnologias modernas tais como UML (Unified Modeling Language), componentes de software, e orientação a objetos / Abstract:This dissertation deseribes the development of a videoconference system targeted to high speed networks that can be integrated into distance learning systems lacking of this functionality. The system is designed to be portable, open, and distributed, allowing the integration among teacher and students (in a distance Jearning environment) through live audio and video, and event notifications. The impJementation relies on the CORBA (Common Object Request Broker Architecture) architecture and the Java language. Two CORBA services were employed: AIV Streams for eontinuous media transport and Event Service for event notification. The design and development employ modem technologies such as UML (Unified Modeling Language), software components, and object-orientation / Mestrado / Engenharia Eletrica / Mestre em Engenharia Elétrica

This thesis is focused on SAS Enterprise Intelligence Platform product and it's capabilities to integrate within a Business Intelligence solution. The aim of the thesis is to describe integration technolgies that the platform features, as well as to determine their application field and compare them, eventually add usage examples. The first part of the thesis explains the general concept and architecture of Business Intelligence, afterwards the reader gets familiar with the SAS Enterprise Intelligence Platform, it's stucture and components and it's Business Intelligence market position. The second part of the thesis contains description (how they work and what they are good for) of the integration technologies available in SAS Enterprise Intelligence Platform. Those technologies are mostly implementations of the most common industry standards (database APIs, COM/DCOM, CORBA, web services). The study also includes description of these standards supported by SAS. The thesis features also comparisions of the integration technologies, namely comparison of database API implementations and comparision of Integrated Object Model API with SAS BI Web Services.

Parallel, adaptive Level-of-Detail in VR simulations. Parameters for efficient reuse of already calculated reductions are investigated. Choosen reduction algorithms are evaluated. Parameters for communication within the distributed application are determined. An implementation is introduced. / Paralleles, adaptives Level-of-Detail komplexer Objekten in VR-Simulationen. Die Parameter für eine effiziente Wiederverwendung bereits berechneter Reduktionen werden untersucht. Ausgewählte Reduktionsalgorithmen werden evaluiert. Die Parameter für die Kommunikation in der verteilten Applikation werden ermittelt. Eine Implementation wird vorgestellt.