Rtv Braga

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Papers by Rtv Braga

Service Oriented Reference Architecture for the Development of Context-awareLearning Environments

by Átila Lopes and Rtv Braga

2019 IEEE Frontiers in Education Conference (FIE), 2019

This Research-to-Practice Full Paper is concerned with the development of u-learning environments... more This Research-to-Practice Full Paper is concerned with the development of u-learning environments, which is a very complicated task due to, among other factors, the complexity in managing large amounts of context information and adapting content to different users and contexts. Possible solutions to overcome the challenges and provide support for the development of context-aware systems is the use of reference architectures (RA) and service-oriented architectures (SOA). RA is a software architecture that can be applied to build architectures of specific domain systems, supporting the development of system families. SOA is an architectural style that provides functionalities encapsulated in Web services, which make it easier the integration of dynamic adaptive behavior into the applications. Therefore, this paper presents oriented RA to assist the development of context-aware ubiquitous learning environments, characterized by their ability to obtain and use information from the users...

Run-time Adaptable Service Oriented Architecture in the Context of Repository Systems

Service-Oriented Architectures facilitate high modularity and reusability. In this context, servi... more Service-Oriented Architectures facilitate high modularity and reusability. In this context, service discovery is crucial in identifying new servers that meet the desired client requirements. Although this approach may seem ideal, it is not enough in some situations. For example, in the case of different artifact repositories, they may rely on specific services to adequately adapt to their unique requirements and evolve accordingly. Even considering the availability of common standards for metadata, storing beyond basic metadata and supporting data interchange often requires the development of specific systems. In this paper, we present an architecture for a completely dynamic service-oriented system and use it to implement a prototype of an artifact repository server capable of using different protocols and schemas and reloading new configurations while running. This capability is made possible through an innovative combination of service-oriented architecture, models at run-time, code interpretation, and code generation with just-in-time compiling. This dynamic nature enables the deployment of new configurations on demand without requiring a restart while also facilitating the execution of data processing tasks for various purposes, such as data analysis, in a seamless manner. A working prototype using multiple configurations is used to attest the feasibility of the architecture. We conclude that the solution is viable, but we point to possible scalability and security concerns and how to tackle them.

format_quoteCase studies confirm prototype's successful adaptability to different schemas and processing codes during real data transmission.format_quote

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A process for construction and instantiation of frameworks based on a domain-specific pattern language

Padrões, linguagens de padrões e frameworks são formas de reuso de software. A complexidade de fr... more Padrões, linguagens de padrões e frameworks são formas de reuso de software. A complexidade de frameworks, causada pela dificuldade tanto em construí-los quanto em utilizá-los, é um dos inibidores do uso dessa tecnologia. Um processo para facilitar a construção e instanciação de frameworks é apresentado. Uma linguagem de padrões é utilizada para apoiar todo o processo, desde a identificação da funcionalidade do framework, seu projeto, implementação, validação, até sua instanciação para sistemas específicos do domínio. O framework obtido é do tipo caixa-branca e sua instanciação é feita especializando-se suas classes para sistemas específicos. O processo inclui, também, a construção de uma ferramenta para automatizar a instanciação do framework, por meio da qual é possível obter um sistema específico fornecendo apenas informações sobre os padrões da linguagem utilizados na sua modelagem. O processo é ilustrado com a Linguagem de Padrões para Gestão de Recursos de Negócios (GRN), que ...

A Risk Management Framework for Scrum Projects

Proceedings of the 23rd International Conference on Enterprise Information Systems

Software changes constantly to suit the market volatility, causing risks to the project. Agile so... more Software changes constantly to suit the market volatility, causing risks to the project. Agile software development approaches, such as Scrum, have been proposed to deal with constant changes in project requirements. In Scrum, the Product Owner (PO) is responsible for managing such changes and ensuring that the developed software brings significant value to the customers. However, there are potential risks involved in these responsibilities. If not properly managed, they can lead to project failure. In this paper, we introduce a novel approach to managing risks involving PO's roles. In our work, we tailored the risk management knowledge area from the Project Management Body of Knowledge Guide into the Scrum. We established a framework called RIsk Management PRoduct Owner (RIMPRO), which intends to support project teams to systematically manage risks related to PO activities that may arise during the project. As proof of concept, the processes described in RIMPRO were evaluated by potential users. Through a preliminary assessment, we observed that RIMPRO is promising since it can assist teams in managing risks involving PO in a systematized and effective manner. a .

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An approach to integrate systems towards a directed system-of-systems

Proceedings of the 12th European Conference on Software Architecture: Companion Proceedings, 2018

According to a previously conducted systematic literature review, there are several remaining cha... more According to a previously conducted systematic literature review, there are several remaining challenges related to integrating software systems. These systems have become increasingly complex, and they are often formed by integrating independent systems, resulting in a new class of systems referenced as System-of-Systems (SoS). However, there is a lack of studies that are comprehensive and, at the same time, contain a detailed view of how the constituent systems are integrated in order to collectively achieve a common goal. In systematic literature review conducted in this context, it was identified that several of remaining challenges is due to the lack of documentation about integration in SoS, its constituents and their relationships. Based on this scenario, the main contribution of this work is to investigate and propose an approach to assist the Software Engineering community during the integration among constituent systems of a SoS. We argue that if the integration in SoS is properly documented, we can decrease system of systems integration problems and mitigate the lack of existing SoS documentation. We also conclude how the SoS approach can be beneficial for assist the integration of several tools or systems.

PRO-REQ: a facilitator guide to implement CMMI-Dev requirements engineering and management areas

Anais do VIII Simpósio Brasileiro de Qualidade de Software (SBQS 2009), 2009

Requirements engineering processes are among the major sources of problems found during software ... more Requirements engineering processes are among the major sources of problems found during software development. A way of reducing these problems is to introduce maturity models like CMMI, but they are more likely to define what has to be done, instead of how it should be done. This paper presents a guide whose goal is to facilitate the implementation of requirements engineering processes in organizations that cannot afford their expensive costs. The guide bases on CMMI practices, but also considers several other sources of good practices on requirements engineering and management. The results of applying it in a small Brazilian software development organization are also presented.

format_quotePROREQ, structured around CMMI-DEV, serves as a detailed guide for implementing effective requirements processes.format_quote

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Understanding the Successes and Challenges of Model-Driven Software Engineering - A Comprehensive Systematic Mapping

2018 XLIV Latin American Computer Conference (CLEI), 2018

Model-Driven Software Engineering (MDSE) is a development method in which models are used to gene... more Model-Driven Software Engineering (MDSE) is a development method in which models are used to generate software. Despite documented advantages, projects employing MDSE may fail due to development challenges. In this paper, we study and document these challenges by conducting an upto-date systematic mapping that goes beyond reviewing MDSE studies: we also include two derived paradigms (Model-Oriented Programming and Models at Run-time). Therefore, we present a systematic mapping with two objectives: The first objective was to identify specific domains in which MDSE is successful, while the second objective was to identify what are the challenges to apply this methodology to general purpose development processes. Following the review of 4859 studies (3727 are unique), we have identified the application and technological domains in which MDSE projects are more likely to succeed. We also discuss challenges presented by 17 primary studies. The analysis of the results indicate that MDSE application is consolidated in specific domains. A common feature identified among studies related to general purpose MDSE processes is that, initially, authors reported lack of proper methods and training. After new techniques have risen, it has been pointed that MDSE projects still face maintenance problems that can discourage their usage in other domains.

format_quoteIdentified 17 unique studies on MDSE challenges, including 9 methodology and 8 maintenance issues, highlighting significant obstacles in application.format_quote

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Fostering Reuse by Integration: A Directed System of System Development Case

Presentation of the Fostering Reuse by Integration: A Directed System of System Development Case ... more

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Methodologies for Evaluation and Improvement of Software Processes in the Context of Quality and Maturity Models: a Systematic Mapping

A widely recognized fact is that the quality of software products is largely determined by the qu... more A widely recognized fact is that the quality of software products is largely determined by the quality of the process used to develop them. Regardless of the number of tools/frameworks developed to aid companies to perform software process assessment (SPA) and improvement (SPI) activities, the industry often suffers with quality issues in their products. In order to evaluate the SPA and SPI research areas, a systematic mapping was performed to identify the available tools/frameworks and methodologies used in research, as well as the existing gaps in the area. As a result it was possible to identify the current trends in the SPA and SPI research areas that can be used as a guideline to future work and can contribute to the software engineering and quality community.

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Proposta de Uma Linha de Produtos de Software para Sistemas de Aprendizagem Ubíquos com Internet das Coisas

Anais dos Workshops do VI Congresso Brasileiro de Informática na Educação (CBIE 2017), 2017

Learning systems might incorporate Internet of Things devices, which acquire the sensors' context... more Learning systems might incorporate Internet of Things devices, which acquire the sensors' context awareness and allow learning systems evolution towards ubiquitous learning. However, as identified in a Systematic Mapping previously done, developing systems in this application domain involves a high degree of rework, since reuse techniques are little explored. Based on this, this work presents UL-SOPL (Ubiquitous Learning Service-Oriented Product Line), a Service Oriented Product Line designed from existing learning systems. Use scenarios where UL-SOPL is istantiated deriving specific learning systems are also presented.

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Aprendizagem Ubíqua Sensível ao Contexto: Mapeamento Sistemático da Literatura Sobre Ambientes de Aprendizagem Ubíqua

Context-sensitive ubiquitous learning (u-learning) environments are systems applied in the field ... more Context-sensitive ubiquitous learning (u-learning) environments are systems applied in the field of education, characterized by the ability to collect information from the student's context and modify your behavior, adapting to the characteristics and student's learning needs. In addition, another important feature of ulearning is to provide access to computing learning resources anywhere, anytime, regardless of the user's device type. Faced with this new scenario, still unknown to most of the academic community, this paper proposes to investigate the context-sensitive u-learning environments, proposed in the literature of the area, to know the educational services and the types of context used in these environments, through a systematic mapping of the literature.

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Supporting Tools for Managing Software Product Lines: a Systematic Mapping

In order to successfully design and build a Software Product Line (SPL), besides the difficult ta... more In order to successfully design and build a Software Product Line (SPL), besides the difficult task of making a good domain engineering based on a solid knowledge – both theoretical and practical – about the subject domain, it is still necessary to consider other barriers such as lack of computational support, lack of documentation available and the complexity or unavailability of existing supporting tools. These are some of the reasons that may discourage the adoption and wide usage of SPL in organizations. In this context, this paper presents a Systematic Mapping (SM) of supporting tools for managing SPLs. This SM was performed in order to identify, gather and classify existing solutions in the literature that offer support for managing product lines both in single or multiple phases, since conception until product derivation and evolution of the SPL. The information gathered about the solutions selected is presented in the results. This information comprises the completeness of t...

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Model Driven Development Success Cases for Domain-Specific and General Purpose Approaches: A Systematic Mapping

In the context of a Model Driven Software Engineering research effort, it was identified the need... more In the context of a Model Driven Software Engineering research effort, it was identified the need of surveying the success cases categorized by specific domains and by general purpose development processes. However, no systematic mapping related to this specific context was found. Therefore, we have conducted a systematic mapping with two objectives. The first objective was to identify specific domains in which MDSE is successful, while the second objective was to identify what are the challenges to apply this methodology to general purpose development processes. As results, we have identified that MDSE success cases are clustered into four domains: business information systems, network system design, web software applications and embedded systems. We could only identify five studies related to general purpose approaches and their challenges. The analysis of the results indicate that MDSE application is consolidated in specific domains. A common feature identified among studies rela...

format_quoteFound 7 unique studies detailing challenges in MDSE, including maintenance and methodology issues, confirming persistent obstacles.format_quote

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An Approach for Reusing Software Process Elements based on Reusable Asset Specification: a Software Product Line Case Study

Software reuse is becoming an important focus of both academic and industrial research since the ... more Software reuse is becoming an important focus of both academic and industrial research since the rising demand for new software products and technologies is constantly growing. The short time to market, limited resources and lack of specialists are the main reasons for this investment on software reuse. As long as customers demand speed to deliver, there is a increasing special concern about software quality. In this context, we propose an approach to support both better time to market and software quality from reusing software process elements using the Reusable Asset Specification (RAS). This approach presents a mapping structure to represent process elements as reusable assets. The sharing of process elements among several projects aims to decrease time spent on defining the process model, as well as reducing the space used to store processes and their elements. Documenting these processes will also be facilitated, since it is possible to reuse a whole process or process’s sub-tr...

format_quoteThe proposed approach allows independent storage of SPL process elements using RAS, potentially increasing overall reuse.format_quote

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Um Método de Desenvolvimento de Sistemas de Grande Porte Baseado no Processo RUP

Anais do I Simpósio Brasileiro de Sistemas de Informação (SBSI 2004), 2004

Ao lidar com o desenvolvimento de sistemas de grande porte, além da preocupação com análise, proj... more Ao lidar com o desenvolvimento de sistemas de grande porte, além da preocupação com análise, projeto e implementação, uma atenção ainda maior deve ser dada à elicitação de requisitos, por estarem sujeitos a possíveis mudanças até a entrega do produto final. Neste artigo, sugere-se uma adaptação ao processo RUP para resolver esse problema, promovendo o desenvolvimento de subsistemas de forma incremental. A cada subsistema implantado, os riscos são mitigados, aprimora-se a eficiência do processo pelo reuso do conhecimento adquirido e dos artefatos produzidos, e propicia-se ao cliente retorno de parte do seu investimento antes da conclusão de todo o projeto.

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Ambiente de Aprendizagem Ubíqua para Auxiliar o Estudo de Botânica em Atividades de Aula de Campo

Anais do XXIX Simpósio Brasileiro de Informática na Educação (SBIE 2018), 2018

This article is the result of a developing research project, which proposes the construction of a... more This article is the result of a developing research project, which proposes the construction of a ubiquitous learning environment to assist the teaching-learning process of botany, serving as a didactic resource for activities carried out in field lessons. In this way, the article summarizes the most important aspects of the project and its current phase of development. Resumo. Este artigo é fruto de um projeto de pesquisa em desenvolvimento, que tem como proposta a construção de um ambiente de aprendizagem ubíqua para auxiliar o processo de ensino-aprendizagem de botânica, servindo como um recurso didático para atividades realizadas em aulas de campo. Desta forma, o artigo resume os aspectos mais importantes do projeto e sua fase atual de desenvolvimento.

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Um Mapeamento Sistemático em Progresso Sobre Internet das Coisas e Educação à Distância

Anais dos Workshops do V Congresso Brasileiro de Informática na Educação (CBIE 2016), 2016

Resumo. A Internet das Coisas surgiu com a alta disponibilidade de sensores, fundamentando a cria... more Resumo. A Internet das Coisas surgiu com a alta disponibilidade de sensores, fundamentando a criac ¸ão das smart cities. No âmbito da Educac ¸ão À Distância, ainda são estudadas novas formas de utilizar a IoT, a fim de avanc ¸ar a educac ¸ão rumo ao ensino ubíquo, permitindo o aprendizado em qualquer lugar e instante. Este trabalho apresenta um Mapeamento Sistemático preliminar sobre a atual relac ¸ão entre Internet das Coisas e a Educac ¸ão À Distância. Os resultados obtidos mostram que a utilizac ¸ão de IoT não é reconhecida na maioria dos casos, apesar de ser amplamente utilizado e já existirem tentativas de criar ambientes de aprendizado ubíquo. Como trabalho futuro, pretende-se completar este mapeamento sistemático.

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Padrões de software a partir da engenharia reversa de sistemas legados

pela orientação que me deu, sempre com muita atenção e entusiasmo. Pelo direcionamento que deu à ... more pela orientação que me deu, sempre com muita atenção e entusiasmo. Pelo direcionamento que deu à pesquisa, tão essencial para aproveitar ao máximo as minhas potencialidades. Pela oportunidade de voltar à pesquisa e poder associá-la à prática profisssional. Aos professores do ICMC pela acolhida calorosa depois de dez anos de afastamento da Universidade. Aos Profs. Drs. Norm Kerth e Ralph Johnson pela recepção generosa que me deram na área de pesquisa em padrões de software. À Prof. Dra. Rosângela Dellosso Penteado pela total disponibilidade na execução de trabalhos conjuntos e por sua amizade e atenção. Ao Prof. Dr. Antonio Francisco do Prado pela oportunidade de ter contato com a máquina Draco-Puc. Às alunas de graduação Fabiana Rocha, do ICMC e Tiemi Sakata, da UFSCAR, pelos trabalhos de iniciação científica que contribuiram para as publicações feitas durante a execução deste trabalho. Aos mestrandos, doutorandos, pesquisadores e bolsistas do Laboratório de Engenharia de Software do ICMC pela amizade, atenção e auxílio na utilização de máquinas e programas. Aos colegas da Universidade de Franca pelo apoio e incentivo durante todo o programa de mestrado. Aos colegas do Senac -São Carlos pelo incentivo que me deram para que eu pudesse contribuir efetivamente na atividade de treinamento profissional em que estão empenhados e que são tão importantes para o desenvolvimento do país. Às secretárias da pós-graduação pela atenção, paciência e disponibilidade com que sempre me atenderam. Às secretárias, bibliotecárias e funcionários do ICMC que se mostraram sempre prestativos no meu atendimento. À Fapesp pela bolsa de iniciação científica concedida durante meu curso de graduação que me deu oportunidade de travar os primeiros contatos com a pesquisa e que abriram caminho para as atividades aqui relatadas. Às empresas que me deram a oportunidade de exercer as minhas atividades profissionais na área de consultoria e desenvolvimento de sistemas. Aos meus pais Miguel e Maria Teresa pela educação que me deram e pelo suporte aos meus filhos durante minha ausência. Aos meus irmãos Ailton e Anderson pela disposição e prontidão com que sempre me atenderam nas situações imprevistas. Ao Cirilo pelo companheirismo durante os momentos difíceis, pela dedicação em me substituir junto a nossos filhos durante muitas vezes neste período, pelo incentivo constante e pelas sugestões na correção da ortografia desta dissertação. Ao Thales e ao Vitor pela compreensão da importância deste trabalho para mim. A execução da engenharia reversa orientada a objetos de um sistema legado desenvolvido com orientação procedimental é usada como base para sua reengenharia, seguindo duas abordagens diferentes. Na primeira, o sistema passa por reengenharia com mudança de orientação, por meio de segmentação e, posteriormente, é transformado para uma linguagem orientada a objetos de forma semi-automática. Na segunda, é feito o reconhecimento de padrões recorrentes de software no modelo de objetos produzido pela engenharia reversa, para depois efetuar a reengenharia utilizando esses padrões. Os resultados obtidos por intermédio dessas duas abordagens podem ser comparados quanto à manutenibilidade, legibilidade e reuso. A versão original do sistema legado escolhido para a realização da experiência está implementado na linguagem Clipper e possui cerca de vinte mil linhas de código. Trata-se de uma oficina auto-elétrica e mecânica de veículos. Para a engenharia reversa foi escolhido o método Fusion/RE, sendo feita uma proposta para sua evolução, adicionando um maior detalhamento da etapa de abstração do modelo de análise do sistema. Para mudança de orientação do paradigma de desenvolviemnto, de procedimental para orientado a objetos, são propostas duas etapas adicionais a serem executadas após a aplicação do Fusion/RE: o projeto avante do sistema e a segmentação do programa legado. Indicações sobre como fazer a segmentação são fornecidas. A transformação do código segmentado em Clipper para Java é feita com auxílio da máquina Draco-Puc. Uma estratégia é proposta para o reconhecimento de padrões a partir do modelo de objetos do sistema obtido pela engenharia reversa. Por meio dela, instâncias dos padrões Type-Object, Association-Object, State Across a Collection e Behaviour Across a Collection podem ser reconhecidas. Experiências de implementação de alguns desses padrões, em Delphi, são feitas.

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Patterns for enterprise application integration

Proceedings of the 9th Latin-American Conference on Pattern Languages of Programming, 2012

The development of Information Technology (IT) demands the integration of systems (legacy or new)... more The development of Information Technology (IT) demands the integration of systems (legacy or new), so that they can operate in a distributed way and promoting the reuse of design, code and information in a high granularity level. Enterprise Application Integration (EAI) plays a fundamental role in this scenario. It can be conducted by different means, for example, by sharing the access to databases or using Web Services (WS). Both solutions are being adopted by organizations, although they present advantages and disadvantages that should be analysed. Several restrictions can be present in the particular integration scenario, causing problems to be solved before deciding if the integration should be done by data access or WS. So, this work has the objective of documenting these problems and solutions in the pattern format, in order to make available to other developers the knowledge acquired when doing EAI. These solutions can be used to improve reuse in certain integration contexts, depending on the organization business rules.

An approach based on Takagi-Sugeno Fuzzy Inference System applied to the operation planning of hydrothermal systems

2011 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2011), 2011

ABSTRACT The operation planning in hydrothermal systems with great hydraulic participation, as it... more ABSTRACT The operation planning in hydrothermal systems with great hydraulic participation, as it is the case of Brazilian system, seeks to determine an operation policy to specify how hydroelectric plants should be operated, in order to use the hydroelectric resources economically and reliably. This paper presents an application of Takagi-Sugeno Fuzzy Inference Systems to obtain an operation policy (PBFIS Policy Based on Fuzzy Inference Systems) that follows the principles of the optimized operation of reservoirs for electric power generation. PBFIS is obtained through the application of an optimization algorithm for the operation of hydroelectric plants. From this optimization the relationships between the stored energy of the system and the volume of the reservoir of each plant are extracted. These relationships are represented in the consequent parameters of the fuzzy linguistic rules. Thus, PBFIS is used to estimate the operative volume of each hydroelectric plant, based on the value of the energy stored in the system. In order to verify the effectiveness of PBFIS, a computer simulation model of the operation of hydroelectric plants was used so as to compare it with the operation policy in parallel; with the operation policy based on functional approximations; and also with the result obtained through the application of the optimization of individualized plants&#39; operation. With the proposed methodology, we try to demonstrate the viability of PBFIS&#39; obtainment and application, and with the obtained results, we intend to illustrate the effectiveness and the gains which came from it.

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