Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2016-03-22T17:53:33Z No. of bitstreams: 2 Dissertação - Gustavo Cipriano Mota Sousa - 2012.pdf: 2362932 bytes, checksum: 554bee516fc979b416ec8ff1b253e521 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-03-23T14:15:40Z (GMT) No. of bitstreams: 2 Dissertação - Gustavo Cipriano Mota Sousa - 2012.pdf: 2362932 bytes, checksum: 554bee516fc979b416ec8ff1b253e521 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) / Made available in DSpace on 2016-03-23T14:15:40Z (GMT). No. of bitstreams: 2 Dissertação - Gustavo Cipriano Mota Sousa - 2012.pdf: 2362932 bytes, checksum: 554bee516fc979b416ec8ff1b253e521 (MD5) license_rdf: 19874 bytes, checksum: 38cb62ef53e6f513db2fb7e337df6485 (MD5) Previous issue date: 2012-10-09 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / The combination of domain-specific modeling languages and model-driven engineering techniques hold the promise of a breakthrough in the way applications are developed. By raising the level of abstraction and specializing in building blocks that are familiar in a particular domain, it has the potential to turn domain experts into application developers. Applications are developed as models, which in turn are interpreted at runtime by a specialized execution engine in order to produce the intended behavior. In this approach models are processed by domain-specific execution engines that embed knowledge about how to execute the models. This approach has been successfully applied in different domains, such as communication and smart grid management to execute applications described by models that can be created and changed at runtime. However, each time the approach has to be realized in a different domain, substantial re-implementation has to take place in order to put together an execution engine for the respective DSML. In this work, we present a generalization of the approach in the form of a metamodel that captures the domain-independent aspects of runtime model interpretation and allow the definition of a particular class of domain-specific execution engines which provide a highlevel service upon an underlying set of heterogenous set of resources. / Abordagens de engenharia de software dirigida por modelos propõem o uso de modelos como uma forma de lidar com a crescente complexidade das aplicações atuais. Por meio de linguagens de modelagem específicas de domínio, essas abordagens visam elevar o nível de abstração utilizado na engenharia de software, possibilitando que usuários que conheçam o domínio de negócio sejam capazes de construir aplicações. As aplicações são definidas como modelos que são então processados de forma automatizada por mecanismos capazes de executá-los. Essa abordagem tem sido aplicada em domínios como comunicação e redes elétricas inteligentes para possibilitar a construção de aplicações por meio de modelos que podem ser criados e modificados em tempo de execução. Nessa abordagem, modelos são processados por máquinas de execução específicas de domínio, que encapsulam o conhecimento necessário para executá-los. No entanto, a aplicação dessa mesma abordagem em outros domínios exige que novas máquinas de execução sejam implementadas por completo, o que exige um grande esforço de implementação. Neste trabalho, apresentamos uma abordagem dirigida por modelos para a construção dessas máquinas de execução de modelos. Essa abordagem propõe um metamodelo que captura os aspectos independentes de domínio de uma classe particular de máquinas de execução de modelos, os quais descrevem aplicações baseadas no provimento de serviços a partir de um conjunto heterogêneo de recursos. A partir do metamodelo proposto, podem ser construídos modelos que definem máquinas de execução para domínios específicos, as quais são capazes de executar modelos descritos na linguagem de modelagem específica do domínio em questão.

Made available in DSpace on 2016-08-17T14:52:42Z (GMT). No. of bitstreams: 1 Dissertacao-GersonLobatoRabelo.pdf: 4450245 bytes, checksum: 15830f76fa41def073930b74d39d40e2 (MD5) Previous issue date: 2015-08-31 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Cloud Computing is a computational paradigm which came with the idea of cloud-based services, resources and functionalities offered by enterprises to end users through service delivery models. The main models are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Offered services and resources are commonly tested by testing and maintenance teams with the purpose of detecting and eliminating present failures. In relation to SaaS models, the most common test types used are functional, performance, scalability, component-based and tenant-based ones. However, tests like reliability, availability, usability and acceptance ones, more oriented to users, are less performed. In the field of Model Driven Engineering (MDE), the tests in SaaS, PaaS and IaaS models are performed through approaches like transformation of models and generation of test cases according to test types, allowing services and resources being tested with great quality and efficiency. This dissertation shows an approach based on Model Driven Engineering to support generation of availability, reliability, usability (after user uses the open-source SaaS model and answer a questionnaire about his/her profile and about the model) and acceptance test cases for SaaS models with open source code (Open Software as a Service Open SaaS). A framework and metamodels are proposed to this end, besides quantitatives metrics with the purpose of analize these criteria for the proposed Open SaaS model. / A Computação em Nuvem é um paradigma computacional que surgiu com a ideia de serviços, recursos e funcionalidades baseados em nuvem e que são ofertados por empresas para usuários finais através de modelos de entregas de serviços. Os modelos principais são Infrastructure as a Service (IaaS), Platform as a Service (PaaS) e Software as a Service (SaaS). Os serviços e recursos ofertados são constantemente testados pelas equipes de manutenção e teste com o objetivo de detectarem e eliminarem as falhas presentes. Em relação aos modelos SaaS, os tipos de teste mais usados são os funcionais, de performance, de escalabilidade, de componentes e os testes baseados nos inquilinos dos modelos SaaS. No entanto, testes como os de confiabilidade, de usabilidade, de disponibilidade e de aceitação, mais orientados ao cliente, são pouco realizados. No campo da Engenharia Dirigida por Modelos (Model Driven Engineering - MDE), os testes em modelos SaaS, PaaS e IaaS são feitos através de abordagens como a transformação de modelos e a geração de casos de teste de acordo com os tipos de teste, permitindo que os serviços e recursos sejam testados com maior qualidade e eficiência. Esta dissertação apresenta uma abordagem baseada em Engenharia Dirigida por Modelos para suportar a geração de casos de teste de disponibilidade, confiabilidade, usabilidade (após o usuário utilizar o modelo SaaS de código aberto e responder um questionário sobre seu perfil e sobre o modelo) e aceitação para modelos SaaS de código aberto (Open Software as a Service Open SaaS). Um framework e metamodelos são propostos para este fim, além de métricas quantitativas com o propósito de analisar estes critérios para o modelo Open SaaS proposto.

Made available in DSpace on 2016-08-17T14:53:18Z (GMT). No. of bitstreams: 1 Eduardo Devidson Costa Bezerra.pdf: 6161794 bytes, checksum: 61fa31f8c5757b2b771df924fa5e9483 (MD5) Previous issue date: 2011-07-29 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The use of the Internet as a way to publish new applications and deliver new functionalities has consolidated the use of web services technology. Once web services technology enables a high degree of autonomy and interoperability, it provides a basic infrastructure for the development and composition of new services, which has benefited the business process management providing the agility required by enterprises to meet the need of rapidly changing business environment. Recently, new paradigms are being developed to deal with the increasing complexity in the development, maintenance and evolution of software systems. Among the new paradigms, Model Driven Engineering (MDE) and the Ontology stands out as the most promising for handling complex software systems. This work presents an approach to perform the dynamic composition of web services using techniques of match models (metamodels) that represent services. Models representing services must include semantic and structural aspects of the web service achieved through approaches to ontologies. Thus, we conjecture to establish matchings and measure the degree of similarity between models and investing in research about Ontologies and MDE in order to generate a tool that can assist in a Dynamic Composition of Web Services. A case study is presented to illustrate this approach. / A utilização da internet como forma de publicar novas aplicações e disponibilizar novas funcionalidades tem consolidado o uso da tecnologia de serviços web. Uma vez que essa tecnologia viabiliza um alto grau de interoperabilidade e autonomia, a tecnologia de serviços web fornece uma infra-estrutura básica para o desenvolvimento e a composição de novos serviços, o que tem beneficiado à gerência de processos de negócio oferecendo assim, a agilidade necessária e requerida pelos empreendimentos frente à necessidade de rápidas mudanças no ambiente de negócios. Recentemente, novos paradigmas vêm sendo desenvolvidos para fazerem face à complexidade cada vez mais crescente no desenvolvimento, manutenção e evolução de softwares. Dentre eles a Engenharia Dirigida por Modelos (MDE Model Driven Engineering) e as Ontologias se destacam como os mais promissores. Neste trabalho, apresenta-se uma abordagem para realizar a composição dinâmica de um novo serviço web utilizando técnicas de Matching de modelos (ou metamodelos) que representem serviços. Tal representação deverá conter aspectos semânticos e estruturais do serviço web conseguidos através de abordagens de Ontologias. Sendo assim, vislumbra-se estabelecer correspondências e medir o grau de similaridade entre modelos investindo na pesquisa de MDE e Ontologias com o intuito de gerar uma ferramenta que possa auxiliar na Composição Dinâmica de um Serviço. Para validar a abordagem, um estudo de caso será apresentado.

Made available in DSpace on 2016-08-17T14:53:23Z (GMT). No. of bitstreams: 1 Dissertacao Jessica Bassani.pdf: 6480289 bytes, checksum: 763e127476700fc704634c924dde4d34 (MD5) Previous issue date: 2012-12-21 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / We present an approach to support the creation of test cases for software systems in cloud computing environments. This approach is based on Model Driven Engineering (MDE). A framework, a methodology and metamodels are proposed to support the generation of test cases. Metamodels for cloud computing environments and transformation definitions are proposed. Two illustrative examples help to understand our approach and the steps to apply it. A prototype implementing the proposed framework is presented and it works together with MT4MDE and SAMT4MDE to generate semi-automatically transformation definitions and contribute to the semiautomatic creation of testing model and test code for cloud computing platforms. We present an evaluation of our approach and compare it with other approaches, detaching main differences, including advantages and disavantages. / Apresenta-se uma abordagem para suportar a criação de casos de teste para sistemas de software em ambientes de Computação em Nuvem. Esta abordagem é baseada na Engenharia Dirigida por Modelos (MDE). Um framework, uma metodologia e metamodelos são propostos para suportar a geração dos casos de teste. Metamodelos específicos para plataformas de Computação em Nuvem são propostos. Dois exemplos ilustrativos ajudam a compreender a abordagem e os passos para aplicá-la. A prototipagem do framework proposto reutiliza as ferramentas MT4MDE e SAMT4MDE para gerar definições de transformação semiautomaticamente para contribuir com a criação semiautomática de modelos de teste e códigos de teste para plataformas de Computação em Nuvem. Uma avaliação é feita, comparando com o framework desenvolvido abordagens existentes com nossa abordagem proposta, destacando os principais diferenciais, incluindo vantagens e desvantagens.

Made available in DSpace on 2016-08-17T14:53:26Z (GMT). No. of bitstreams: 1 Dissertacao Marcus Vinicius Ribeiro.pdf: 4694533 bytes, checksum: b84a4bad63b098d054781131cfb9bc26 (MD5) Previous issue date: 2014-02-24 / Model Driven Engineering (MDE) aims to make face to the development, maintenance and evolution of complex software systems, focusing in models and model transformations. This approach can be applied in other domains such as database schema integration. In this research work, we propose a framework to integrate database schema in the MDE context. Metamodels for defining database model, database model matching, database model merging, and integrated database model are proposed in order to support our framework. An algorithm for database model matching and an algorithm for database model merging are presented. We present also, a prototype that extends the MT4MDE and SAMT4MDE tools in order to demonstrate the implementation of our proposed framework, metodology, and algorithms. An illustrative example helps to understand our proposed framework. / A Engenharia Dirigida por Modelos (MDE) fornece suporte para o gerenciamento da complexidade de desenvolvimento, manutenção e evolução de software, através da criação e transformação de modelos. Esta abordagem pode ser utilizada em outros domínios também complexos como a integração de esquemas de base de dados. Neste trabalho de pesquisa, propomos uma metodologia para integrar schema de base de dados no contexto da MDE. Metamodelos para definição de database model, database model matching, database model merging, integrated database model são propostos com a finalidade de apoiar a metodologia. Um algoritmo para database model matching e um algoritmo para database model merging são apresentados. Apresentamos ainda, um protótipo que adapta e estende as ferramentas MT4MDE e SAMT4MDE a fim de demonstrar a implementação do framework, metodologia e algoritmos propostos. Um exemplo ilustrativo ajuda a melhor entender a metodologia apresentada, servindo para explicar os metamodelos e algoritmos propostos neste trabalho. Uma breve avaliação do framework e diretrizes futuras sobre este trabalho são apresentadas.

The purpose of this thesis was to investigate different concepts and tools which could support the development of a middleware which persists a temporal and versioned relational data model in an enterprise environment. Further requirements for the target application was that changes to the data model had to be facilitated, so that a small change to the model would not result in changes in several files and application layers. Other requirements include permissioning and audit tracing. In the thesis the reader is presented with a comparison of a set of tools for enterprise development and object/relational mapping. One of the tools, a code generator, is chosen as a good candidate to match the requirements of the project. An implementation is presented, where the chosen tool is used. An XML-based language which is used to define a data model and to provide input data for the tool is presented. Other concepts concerning the implementation is then described in detail. Finally, the author discusses alternative solutions and future improvements.

Executable and Translatable UML (xtUML) is the next abstraction level in software development, where both programming language and software architecture have been abstracted away. xtUML is a well defined UML profile, extended with precise action semantics. This allows the developers to define a problem area, domain, in such a detail that it can be executed. By defining the system with xtUML-models, domains, the system functionality can be verified early in the development process. Translation to code can be done in different ways and this work will be performed in an environment where code is automatically generated with a model compiler. The goal with a domain is that it should be independent of other domains, reused without modification and exchanged with another domain solving the same problem. However a domain can make assumptions that certain functionality is available and these assumptions are requirements for another domain. To fulfil these goals there must be a minimal coupling between the domains. This can be solved with the technique Implicit Bridging, where the bridge dependency between domains is defined in a bridge. The dependency is in the form of mappings/coupling between elements in both domains. By defining a bridge interface for a server domain a client domain can use the resources offered by the server domain. The work performed shows how an implementation of Implicit Bridging could be realized by applying the technique in a microwave oven system. From the system design five different mapping types have been implemented. The applicability and the quality of the implementation have been verified by testing the generated system functionality and also verifying the goals, exchangeability and reuse of domains, of the system.

No description available.

e-learning, as defined to be the use of information and communications technology (ICT) for supporting the educational processes, has motivated Tanzania to apply ICT in its education system. Tanzania secondary schools in rural areas are geographically and socially isolated. Rural Tanzania secondary schools face a number of problems including ways in getting learning materials, as well as inadequacy in qualified teachers. The impact of these problems is poor performance in National Examinations. This poor performance however is highly noted in science and mathematics subjects. The problem in getting learning materials can be reduced by employing ICT in secondary school education system. This research develops an interactive e-learning management system (e-LMS) to be used by Tanzanian secondary schools. The research is aiming to support teaching and learning functions by allowing creation and storage of learning materials, making them available, easily accessed and sharable among students from different secondary schools in Tanzania in a more organized way. Tanzania has only one curriculum for all secondary schools registered under the Ministry of Education and Vocational Training (MoEVT). During development stage it will not be easy to involve all scattered Tanzanian secondary schools. The research is focusing to two selected pilot schools; Kibaha secondary school and Wali-ul-Asr girls’ seminary in Kibaha town, Pwani region. Features of the e-LMS will represent the standard form of any other secondary school registered by the MoEVT. The complete implementation of the e-LMS to these selected pilot schools will later be extended to all other secondary schools in Tanzania. The development uses Object-Oriented System Analysis and Design (OOSAD) approach along with the power of modeling as it has been emphasized by Model Driven Architecture (MDA). Unified Modeling Language (UML) is mainly used in both cases. To create an interoperable system, UML is integrated with extensible markup language (XML) during model transformation from e-LMS Platform Independent Model (PIM) to e-LMS Platform Specific Model (PSM). Development will make use of open source software. For context specific development, participatory action research methodology is adopted and the inputs are well presented in developing e-LMS. Customization of open source learning management system (LMS) platforms is employed to help generate a timely solution to e-LMS development. Finally, this thesis also considers the need for replication and mirroring of the database for the purpose of making learning materials highly available to end-users.

Business Intelligence (BI) is the set of techniques and technologies that support the decision-making process by providing an aggregated insight on data in the organization. Due to the numerous potentially useful data hold by the events and applications running in the organization, the BI market calls for new technologies able to suitably exploit it for analysis wherever it is available. In particular, the Extract, Transform, and Load (ETL) processes, the fundamental BI technology responsible for integrating and cleansing organization data, must respond to these requirements.<p><p>However, the development of ETL processes is still considered to be very complex and time-consuming, to such a point that roughly 80% of the BI project effort is dedicated to the ETL development. Among the phases of ETL development life cycle, ETL modeling is a critical and laborious task. Actually, this phase produces<p>the first effective formal representation of the ETL process, i.e. ETL model, that is completely reused and refined in the subsequent phases of the development.<p><p>Typically, the ETL processes are modeled using vendor-specific ETL tools from the very beginning of development. However, these tools are unsuitable for business users since they induce overwhelming fine-grained models.<p><p>As an attempt to provide more appropriate tools to business users, vendor-independent ETL modeling languages have been proposed in the literature. Nevertheless, they still remain immature. In order to get a precise view on these languages, we conduct a survey which: i) defines a set of criteria associated to major ETL<p>requirements identified in the literature; ii) compares the surveyed conceptual languages, issued from research work, to the physical languages, issued from prominent ETL tools; and iii) studies the whole methodologies of ETL development associated<p>to these modeling languages.<p><p>The analysis of our survey reveals several drawbacks in responding to the ETL requirements. Particularly, the conceptual languages have incomplete elements for ETL modeling with few or no formalization. Several languages are only descriptive with no ability to be automatically implemented into executable code, nor are they able to be automatically maintained according to changes over time.<p><p>To address these shortcomings, we present, in this thesis, a novel approach that tackles the whole development life cycle of ETL processes. <p><p>First, we propose a new vendor-independent language aiming at modeling ETL processes similar to typical business processes, the processes responsible for managing the operations in an organization. The rational behind this proposal is to provide ETL processes with better access to data in events and applications of the organization, including fresh data, and better design capabilities such as available analysis for any users. By using the standard representation mechanism denoted BPMN (Business Process Modeling and Notation) and a classification of ETL elements resulting from a study of the most used commercial and open source ETL tools, the language enables building agile and full-edged ETL processes. We name our language BPMN4ETL to refer to BPMN for ETL processes.<p><p>Second, we build a model-driven framework that provides automatic code generation capability and ameliorates maintenance support of our ETL language. We use the Model-Driven Development (MDD) technology as it helps in developing software, particularly in automating the transformation from one phase of the software development to another. We present a set of model-to-text transformations able to produce code for different business process engines and ETL engines. Also, we depict the model-to-model transformations that automatically update the ETL models with the aim of supporting the maintenance of the generated code according to data source evolution. A demonstration using a case study is conducted as an initial validation to show that the framework covering modeling, implementation and maintenance could be used in practice.<p><p> To illustrate new concepts introduced in the thesis, mainly the BPMN4ETL language, and the implementation and maintenance framework, we use a case study from the fictitious Northwind Traders company, a retailer company that imports and exports foods from around the world. / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished