Roberta Gomes

Universidade Federal do Espirito Santo, Departamento de Informática, Faculty Member

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Roberto Willrich

Universidade Federal de Santa Catarina - UFSC (Federal University of Santa Catarina)

Guillermo de Jesus Hoyos Rivera

Jean-pierre Courtiat

Centre National de la Recherche Scientifique / French National Centre for Scientific Research

Jesus Rivera

Giancarlo Fortino

University of Calabria

Giancarlo Fortino

University of Calabria

Roberto Willrich

Roberta Martins Mendonca Gomes

Harun Agah Altay

Geoffrey Fox

Indiana University

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Papers by Roberta Gomes

Collaborative Web Browsing Tool supporting Audio/Video Interactive Presentations

14th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprise (WETICE'05), 2005

This research has been partially supported by the European IST project Lab@Future. § Researcher o... more

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CoLab: A New Paradigm and Tool for Collaboratively Browsing the Web

IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans, 2006

Widespread adoption of Web technologies, particularly in professional and educational areas, has ... more Widespread adoption of Web technologies, particularly in professional and educational areas, has motivated new research efforts with the objective of designing new interaction mechanisms based on Web technologies. Within this framework, collaborative Web browsing (cobrowsing) aims at extending currently available Web browsing capabilities in order to allow several users to "browse together" on the Web. Such a browsing paradigm can have many useful applications, for instance, in e-learning, for collaboratively searching and retrieving documents, and for online assistance (helpdesk). A cobrowsing system should provide all the facilities required for allowing users to establish and release, in a very simple and flexible way, browsing synchronization relations as well as interactions with continuous media presentations embedded within Web pages. This paper presents the design, modeling, and implementation of the cobrowsing system called CoLab. CoLab provides all the functionalities required for allowing users to collaboratively browse the Web, and a first experimental version of the tool has been implemented and is fully operational.

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Um Arcabouço para Detecção e Alerta de Anomalias de Mobilidade Urbana em Tempo Real

Anais XXXVIII Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos (SBRC 2020), 2020

Os dados coletados por sensores, câmeras, redes sociais e aplicativos podem contribuir para detec... more Os dados coletados por sensores, câmeras, redes sociais e aplicativos podem contribuir para detecção automática de eventos atípicos no trânsito. A natureza heterogênea das fontes de dados traz como vantagem a redundância de informação, aumentando o grau de confiabilidade de eventos detectados. Este trabalho propõe um arcabouço de detecção de eventos anômalos e alertas em tempo real, com uma interface que suporta fontes de dados heterogêneos. Para isto, ao receber os eventos de uma via, o arcabouço os agrupa como séries temporais diárias. É aplicada clusterização nestas séries temporais para criar um histórico padrão, que permite detectar anomalias e emitir alertas em tempo real. Para validar o arcabouço, foram implementadas interfaces para dados disponibilizados pela prefeitura de Vitória-ES, provenientes da plataforma Waze, e Twitter, e um conjunto de algoritmos de clusterização e de detecção de anomalias. Utilizando dados reais da cidade, os resultados mostraram que o arcabouço pr...

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Programmable residues defined networks for edge data centres

2017 13th International Conference on Network and Service Management (CNSM), 2017

Edge Data Centres (EDC) are often managed by a single administrative entity with logically centra... more Edge Data Centres (EDC) are often managed by a single administrative entity with logically centralized control. The architectural split of control and data planes and the new control plane abstractions have been touted as Software-Defined Networking (SDN), where the OpenFlow protocol is one common choice for the standardized programmatic interface to data plane devices. However, in the design of an SDN architecture, there is no clear distinction between functional network parts such as core and edge elements. It means that all switches require to support lookups over hundreds of bits with complex actions that have to be specified by multiple tables. In this paper, we propose a new programmable architecture for EDC networks, named Residues Defined Networks (RDN). In RDN, a controller defines a network policy (e.g. connectivity protection) setting flow entries at the edges. Based on these entries, the edge switches assign route-IDs to flows. A route is defined as the remainder of the division (Residue) between a route-ID and a set of switch-IDs within RDN core. In case of failures, emergency routes are compactly encoded as programmable residues forwarding paths written into the packets. RDN scalability is evaluated considering 2-tier Clos topologies which cover mostly EDC deployments supporting up to 2304 servers. A RDN proof-of-concept prototype is implemented in Mininet for network emulation. Also, to increase the accuracy on latency measures, we implement RDN in NetFPGA that is validated in a testbed with 10Gbps Ethernet boards. RDN offers ultra-fast failure recovery (sub-milliseconds carrier grade), achieves low latency with RDN switching time per hop (≈ 0.6µs) and no jitter within the RDN core.

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Uma Abordagem Baseada em Modelos para Gerenciamento de Situações em CEP

Anais do Simpósio Brasileiro de Computação Ubíqua e Pervasiva (SBCUP 2015), 2015

Este trabalho propõe uma metodologia para apoiar o uso de situações em sistemas de processamento ... more Este trabalho propõe uma metodologia para apoiar o uso de situações em sistemas de processamento de eventos complexos (CEP), tanto em tempo de design quanto em tempo de execução. Em tempo de design foi utilizada a linguagem gráfica SML, permitindo que desenvolvedores modelem situações num alto nível de abstração. Em tempo de execução, foram implementadas transformações de modelos SML para código Java, permitindo que a plataforma alvo (Esper) seja capaz de detectar e processar as situações descritas em SML. Para exemplificar a metodologia proposta, foi desenvolvida uma aplicação voltada para o cenário de detecção de Influenza, segundo as recomendações descritas pela Organização Mundial de Saúde.

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Coletânea de uma Década de Ensino de Programação para Estudantes da Rede Pública no Projeto Introcomp

Revista Brasileira de Informática na Educação, 2021

Este artigo apresenta os 10 anos de trajetória do projeto de extensão universitária Introcomp. O ... more Este artigo apresenta os 10 anos de trajetória do projeto de extensão universitária Introcomp. O projeto visa introduzir a programação de computadores para estudantes de ensino médio da rede pública. O artigo apresenta uma reflexão sobre a experiência da equipe do Introcomp na aplicação de diferentes abordagens para facilitar a aprendizagem de programação para seu público-alvo no decorrer desses anos - passando da linguagem C para Python, de aulas tradicionais a aulas totalmente interativas, chegando em 2020 ao modelo totalmente remoto devido à pandemia de Covid-19. Com isso, o artigo mostra como as lições aprendidas têm ajudado a equipe a repensar o uso de metodologias, tecnologias e plataformas digitais no ensino de programação para jovens do ensino médio em tempos de pandemia. A contribuição deste trabalho traz um avanço para o estado da arte e tem o potencial de ampliar o entendimento da comunidade sobre intervenções de educação em computação direcionadas principalmente ao públi...

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Internet das Coisas como Plataforma Multidisciplinar de Aprendizagem: Projetos Integradores Hardware/Software

This paper presents an experience report of the development of a teaching project, entitled “Inte... more This paper presents an experience report of the development of a teaching project, entitled “Internet of Things as a multidisciplinary learning platform ”, and a case study of the artifacts resulting in an integrated project course. This project provided technical-didactic material discussing the Internet of Things, integrating hardware/software/ communication. Thus, the students were exposed to advanced and practical concepts in the second semester of the Computer Engineering course at the Federal University of Espı́rito Santo. Through an intrinsic motivation test, we observed a high level of interest and self-confidence among students to perform the course’s tasks. Resumo. Este trabalho apresenta um relato de experiência do desenvolvimento de um projeto de ensino, intitulado “Internet das Coisas como plataforma multidisciplinar de aprendizagem”, e um estudo de caso da aplicação dos artefatos resultantes em uma disciplina de projeto integrado. Tal projeto disponibilizou material té...

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RDNA: Residue-Defined Networking Architecture Enabling Ultra-Reliable Low-Latency Datacenters

IEEE Transactions on Network and Service Management, 2018

Datacenter (DC) design has been moved towards the edge computing paradigm motivated by the need o... more Datacenter (DC) design has been moved towards the edge computing paradigm motivated by the need of bringing cloud resources closer to end users. However, the Software Defined Networking (SDN) architecture offers no clue to the design of Micro Datacenters (MDC) for meeting complex and stringent requirements from next generation 5G networks. This is because canonical SDN lacks a clear distinction between functional network parts, such as core and edge elements. Besides, there is no decoupling between the routing and the network policy. In this paper, we introduce Residue Defined Networking Architecture (RDNA) as a new approach for enabling key features like ultra-reliable and low-latency communication in MDC networks. RDNA explores the programmability of Residues Number System (RNS) as a fundamental concept to define a minimalist forwarding model for core nodes. Instead of forwarding packets based on classical table lookup operations, core nodes are tableless switches that forward packets using merely remainder of the division (modulo) operations. By solving a residue congruence system representing a network topology, we found out the algorithms and their mathematical properties to design RDNA's routing system that (i) supports unicast and multicast communication, (ii) provides resilient routes with protection for the entire route, and (iii) is scalable for 2-tier Clos topologies. Experimental implementations on Mininet and NetFPGA SUME show that RDNA achieves 600 ns switching latency per hop with virtually no jitter at core nodes and submillisecond failure recovery time.

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Capítulo 20 - Arquiteturas distribuídas para sistemas colaborativos

Meta Apresentar e analisar as arquiteturas distribuidas utilizadas no desenvolvimento de sistemas... more Meta Apresentar e analisar as arquiteturas distribuidas utilizadas no desenvolvimento de sistemas colaborativos. Objetivos Educacionais Apos o estudo desse capitulo, voce devera ser capaz de: • Identificar os modelos de distribuicao utilizados nas arquiteturas de sistemas colaborativos e avaliar o impacto destes modelos no desempenho dos sistemas. • Identificar os principais modelos de redes Peer-to-Peer e analisar as vantagens do uso deste paradigma em sistemas colaborativos. • Analisar como o paradigma SOA pode ser utilizado no desenvolvimento de sistemas colaborativos. Resumo Neste capitulo sao discutidos os conceitos sobre as arquiteturas distribuidas utilizadas no desenvolvimento de sistemas colaborativos. Sistemas colaborativos sao sistemas distribuidos que apresentam desafios especificos, analisados neste capitulo. Sao apresentados tres modelos de arquiteturas de distribuicao utilizados no desenvolvimento de sistemas colaborativos: arquiteturas centralizadas, descentralizadas e hibridas. A escolha do modelo tem influencia sobre diferentes aspectos do sistema, como desempenho, tolerância a falhas, seguranca, entre outros. Um exemplo de arquitetura descentralizada detalhado neste capitulo e o P2P, em que os recursos sao compartilhados diretamente entre os clientes. Outro paradigma apresentado e SOA, que representa uma classe especifica de arquitetura hibrida. SOA esta apoiado no conceito de servicos interoperaveis que podem ser estendidos, compostos, e colaborar entre si.

Co-browsing System with Support to Audio-Conference

CoLab: A Flexible Collaborative Web Browsing Tool

19th International Conference on Advanced Information Networking and Applications (AINA'05) Volume 1 (AINA papers)

Collaborative Web Browsing aims at extending currently available Web browsing capabilities to all... more Collaborative Web Browsing aims at extending currently available Web browsing capabilities to allow several users getting their browsing activity synchronized. This is a new and promising research area whose possibilities have not yet been exhaustively covered in either, research or commercial solutions. From our point of view a Collaborative Web Browsing system should provide all the necessary facilities to allow users to get synchronized and desynchronized in a flexible way. This synchronization should rely on a simple authorization protocol through which users can invite other users to create and release browsing synchronization relations. Additionally, special synchronization operators are also proposed with the purpose of overriding the authorization protocol. These operators are intended to be used by users having special privileges. In this paper we present our proposal for modeling and implementing of a Collaborative Web Browsing system called CoLab [1], which has been developed using pure Java™ technology; we present the main features of our current development prototype: CoLab 2.0 which relies on the previously stated characteristics.

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Agregação de Notícias Sociais, um Novo Paradigma de Webjornalismo

2008 Simpósio Brasileiro de Sistemas Colaborativos, 2008

This paper describes the social news aggregators pointing these applications as implementers of a... more This paper describes the social news aggregators pointing these applications as implementers of a new paradigm of webjournalism, presenting a brief historic of webjournalism until the Digg [Digg, 2008] appearance, at 2005-the most famous social news agregator. Besides that, we discuss the main social aspects related, the main functionalities, a conceptual model, and the collaborative filtering incorporated in these tools. Finally, we present the ANSUFES, a social news aggregator developed at UFES Resumo Este artigo descreve os agregadores de notícias sociais apontando essas aplicações como implementadoras de um novo paradigma de webjornalismo, apresentando um breve histórico do webjornalismo até o surgimento do Digg, em 2005-o mais famoso agregador de notícias sociais. Além disso, discutimos os principais aspectos sociais envolvidos, as principais funcionalidades, um modelo conceitual e a filtragem colaborativa incorporada nessa ferramenta. Finalmente, apresentamos o ANSUFES, um agregador de notícias sociais desenvolvido na UFES.

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Validação da Estratégia de Adaptação Dinâmica de QoS do Projeto ServiMídia

… Brasileiro de Redes …, 2002

Resumo Os sistemas multimídia distribuídos empregam uma tecnologia aplicável em vários domínios c... more

Suporte à Apresentação Adaptativa de Aplicações Multimídia em Sistemas Distribuídos

Simpósio Brasileiro de …, 2000

Resumo Os sistemas multimídia distribuídos empregam uma tecnologia aplicável em vários domínios c... more

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Sistema de Co-Navegação com Suporte a Áudio-Conferência

Proceedings of IV …, 2007

... Devido ao fato das atividades colaborativas envolverem diferentes indivíduos, apresentando di... more

A co-browsing system with conference support

… Studies in Computer …, 2007

Page 1. 1 Introduction Collaborative Web Browsing or co-browsing can be seen as an extension of t... more

Recollve-representing collaboration in virtual environments

Proceedings of CGVR, 2008

The world globalization process, the increasing demand of communication and information technolog... more The world globalization process, the increasing demand of communication and information technologies creates an enormous demand for collaborative applications. Aiming to support communication, information change and collaboration between users distant geographically, many CSCW (Computer Supported Cooperative Work) systems like audio and videoconference, shared editors, shared whiteboard and CVEs (Collaborative Virtual Environments) were developed. Collaborative Virtual Environments represent an important category of CSCW systems that use 3D shared spaces in order to support collaborative activities. We find also many systems that integrate collaborative applications to satisfy the specific needs of users. We propose in this article RECOLLVE, a CVE agent-based which focuses on representing in the virtual scene a very large set of collaboration activities, including their social aspects.

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A flexible architecture for collaborative browsing

Proceedings. Eleventh IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises

Collaborative Browsing is a new and promising research area whose purpose is to provide new colla... more Collaborative Browsing is a new and promising research area whose purpose is to provide new collaboration schemes among users browsing the Web. To become an efficient collaboration tool, Collaborative Browsing should go far beyond a simple mechanism for coordinating the browsing of Web pages (like Web tours) and should include, in a integrated framework, awareness and communication facilities. A general functional architecture of a Collaborative Browsing system is presented in the paper. It relies on a rule-based system that permits to precisely express the browsing and communication strategies among users of a collaborative session. The proposed architecture is therefore general-purpose. By defining the policy rules specifying the behavior of a collaborative session, it may be easily adapted to specific applications in the e-Learning or e-Business domains. The general architecture of CoLab, a Java-based software environment implementing the proposed Collaborative Browsing system is introduced, and the features of its first operational version are presented in some details (CoLab 1.0).

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LEICA: un environnement faiblement couplé pour l'intégration d'applications collaboratives

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LEICA: Loosely-coupled Environment for Integrating Collaborative Applications

by Guillermo de Jesus Hoyos Rivera and Roberta Gomes

Collaboration activities usually involve several people presenting different group tasks and requ... more Collaboration activities usually involve several people presenting different group tasks and requirements. Accordingly, collaboration is rarely supported by a single CSCW technology. Different types of collaborative applications are then applied in order to support group work. But in spite of being used to accomplish a common collaboration task, these applications are executed independently without getting any advantage of each other. The integration of such applications would allow them to dynamically interoperate, combining their different functionalities in a controlled way. In order to achieve integration, we propose LEICA, a loosely-coupled integration environment which allows collaborative applications to interact without loosing their autonomy. LEICA relies on Web services technology, event notification system, and collaboration policies for controlling interactions between integrated applications.

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Collaborative Web Browsing Tool supporting Audio/Video Interactive Presentations

14th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprise (WETICE'05), 2005

This research has been partially supported by the European IST project Lab@Future. § Researcher o... more

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CoLab: A New Paradigm and Tool for Collaboratively Browsing the Web

IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans, 2006

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Um Arcabouço para Detecção e Alerta de Anomalias de Mobilidade Urbana em Tempo Real

Anais XXXVIII Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos (SBRC 2020), 2020

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Programmable residues defined networks for edge data centres

2017 13th International Conference on Network and Service Management (CNSM), 2017

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Uma Abordagem Baseada em Modelos para Gerenciamento de Situações em CEP

Anais do Simpósio Brasileiro de Computação Ubíqua e Pervasiva (SBCUP 2015), 2015

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Coletânea de uma Década de Ensino de Programação para Estudantes da Rede Pública no Projeto Introcomp

Revista Brasileira de Informática na Educação, 2021

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Internet das Coisas como Plataforma Multidisciplinar de Aprendizagem: Projetos Integradores Hardware/Software

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RDNA: Residue-Defined Networking Architecture Enabling Ultra-Reliable Low-Latency Datacenters

IEEE Transactions on Network and Service Management, 2018

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Capítulo 20 - Arquiteturas distribuídas para sistemas colaborativos

Co-browsing System with Support to Audio-Conference

CoLab: A Flexible Collaborative Web Browsing Tool

19th International Conference on Advanced Information Networking and Applications (AINA'05) Volume 1 (AINA papers)

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Agregação de Notícias Sociais, um Novo Paradigma de Webjornalismo

2008 Simpósio Brasileiro de Sistemas Colaborativos, 2008

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Validação da Estratégia de Adaptação Dinâmica de QoS do Projeto ServiMídia

… Brasileiro de Redes …, 2002

Resumo Os sistemas multimídia distribuídos empregam uma tecnologia aplicável em vários domínios c... more

Suporte à Apresentação Adaptativa de Aplicações Multimídia em Sistemas Distribuídos

Simpósio Brasileiro de …, 2000

Resumo Os sistemas multimídia distribuídos empregam uma tecnologia aplicável em vários domínios c... more

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Sistema de Co-Navegação com Suporte a Áudio-Conferência

Proceedings of IV …, 2007

... Devido ao fato das atividades colaborativas envolverem diferentes indivíduos, apresentando di... more

A co-browsing system with conference support

… Studies in Computer …, 2007

Page 1. 1 Introduction Collaborative Web Browsing or co-browsing can be seen as an extension of t... more

Recollve-representing collaboration in virtual environments

Proceedings of CGVR, 2008

Download

A flexible architecture for collaborative browsing

Proceedings. Eleventh IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises

Download

LEICA: un environnement faiblement couplé pour l'intégration d'applications collaboratives

Download

LEICA: Loosely-coupled Environment for Integrating Collaborative Applications

by Guillermo de Jesus Hoyos Rivera and Roberta Gomes

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