J-schemas integrator : uma ferramenta para integraçao de esquemas de bancos de dados heterogeneos

Orientador : Marcos Sfair SunyeDissertaçao (mestrado) - Universidade Federal do Paraná, Setor de Ciencias ExatasResumo: Atualmente, várias organizações e companhias utilizam diversos sistemas de bancos de dados para gerenciar grande quantidade de seus dados. Entretanto, esses numerosos sistemas de banco de dados heterogêneos foram projetados para rodarem isoladamente e para não cooperarem entre si. Prover interoperabilidade entre esses bancos de dados é importante para o sucesso das organizações, nas quais ganhos de produtividade serão obtidos se esses sistemas puderem ser integrados e permitirem uma visão unificada dos dados. A integração de esquemas de bancos de dados heterogêneos pode ser definida como um processo que, através de uma entrada de um conjunto de esquemas de banco de dados, produz como saída, uma descrição unificada dos esquemas iniciais, chamado esquema integrado e a descrição da informação de mapeamento entre o esquema integrado e os esquemas iniciais. Essa dissertação de mestrado consiste na implementação de uma ferramenta cujo objetivo seja auxiliar e facilitar o processo de integração de esquemas de banco de dados. A ferramenta visual é responsável por importar esquemas de banco de dados, facilitar a identificação dos objetos conflitantes entre esquemas e pelo processo de integração e geração do esquema integrado e da informação de mapeamento entre o esquema integrado e os esquemas iniciais.Abstract: In today's modern organizations is common to find several different databases being used to accomplish their operational data management functions. These numerous heterogeneous databases systems were designed to run in isolation and they do not cooperate with each other. Providing interoperability among these databases is important to the successful operation of the organization. Improvements in productivity will be gained if the systems can be integrated - that is, made to cooperate with each other - to support global applications accessing multiple databases. This work is dedicated to the implementation of a tool to help developers in the task of integration of heterogeneous database schémas. The database schema integration can be defined as the process that, through an input of a set of databases schémas, produces, as the output, an unified description of the initials schémas, called integrated schema and the information mapping that supports the access to the data stored in the initial databases schémas from the integrated schema. The tool is responsible for importing/exporting schémas from/to database, facilitate the identification of conflicting objects between schémas and for the process of integration and generation of the integrated schema and the mapping information between the integrated schema and the initial schémas

Mobile and web tools for participative learning

Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, para a obtenção do grau de Mestre em Engenharia InformáticaThe combination of different media formats has been a crucial aspect on teaching and learning processes. The recent developments of multimedia technologies over the Internet and using mobile devices can improve the communication between professors and students, and allow students to study anywhere and anytime, allowing each student progress at its own pace. The usage of these new platforms and the increase of multimedia sharing applied to educational environments allow a more participative learning, and make the study of interfaces a relevant aspect of existing multimedia learning systems. The work done in this dissertation explores interfaces and tools for participative learning,using multimedia educational systems over Internet broadband and mobile devices. In this work, aWeb-based learning system was developed, which enables to store, transmit, search and share the contents of courses captured in video and its extension to support Tablet PCs. The Web system, developed as part of the VideoStore project, explores video interfaces and video annotations, which encourage the participative work. The usage of Tablet PCs, through the mEmLearn project, has the aim to encourage the participative work, allowing the students to augment the course materials and to share them with other students or instructors

On the Utilisation of Persistent Programming Environments

There is a growing gap between the supply and demand of good quality software, which is primarily due to the difficulty of the programming task and the poor level of support for programmers. Programming is carried out using software tools which do not match very well either real world understanding of a problem or even the other tools which need to be used. In every phase of software production, the programmer must master new tools which function in a different way from each other. The Persistent Programming Paradigm attempts to reduce these problems by providing a programming environment which gives consistent methods of accessing program values of various kinds. Long-term and short-term data are treated in the same way. Numbers, text, graphical values and even program objects are all referred to in the same consistent way. Languages which support persistence provide considerable power within a simple environment, so that programmers can perform most if not all parts of the programming task in a coherent and uniform manner. This thesis tests the hypothesis that programmers do in fact derive some benefit from this - the simplification of the program and faster implementation of complex programs. The persistent language PS-algol is introduced and used to build: user-interface and compiler tools; a database application; some data modelling tools, both relational and semantic; a rapid prototyping system; an object-oriented language; and software support systems. In doing so, the thesis demonstrates the breadth of work which can be achieved using a Persistent Programming Language, and the ease with which these various projects can be implemented. Further, the thesis derives the beginnings of a methodology for using such a language and analyses how PS-algol could be improved. In doing so, the work aims to put the Persistent Programming Paradigm on a firm basis following significant use and experimentation

Information and the End User: Proceedings of the VIIIth World Congress of the International Association of Agricultural Librarians and Documentalists

Proceedings of the VIIIth World Congress of the International Association of Agricultural Librarians and Documentalists. May 28-31, 1990. Budapest, Hungary