Biblioteca Digital

The literature reports research efforts allowing the editing of interactive TV multimedia documents by end-users. In this article we propose complementary contributions relative to end-user generated interactive video, video tagging, and collaboration. In earlier work we proposed the watch-and-comment (WaC) paradigm as the seamless capture of an individual`s comments so that corresponding annotated interactive videos be automatically generated. As a proof of concept, we implemented a prototype application, the WACTOOL, that supports the capture of digital ink and voice comments over individual frames and segments of the video, producing a declarative document that specifies both: different media stream structure and synchronization. In this article, we extend the WaC paradigm in two ways. First, user-video interactions are associated with edit commands and digital ink operations. Second, focusing on collaboration and distribution issues, we employ annotations as simple containers for context information by using them as tags in order to organize, store and distribute information in a P2P-based multimedia capture platform. We highlight the design principles of the watch-and-comment paradigm, and demonstrate related results including the current version of the WACTOOL and its architecture. We also illustrate how an interactive video produced by the WACTOOL can be rendered in an interactive video environment...

Nos últimos anos observa-se um intenso debate acerca da transição da TV analógica para a TV digital, acompanhada pela incorporação de inúmeras inovações, dentre as quais destacamos a interatividade, que abre uma nova modalidade para este meio de comunicação, a TV interativa. Os desafios de pesquisa e desenvolvimento em TV interativa são amplos e ainda não totalmente investigados. Em particular, a questão da consistência de interfaces com usuário se apresenta como um tópico relevante e pouco explorado na literatura. Esta dissertação investiga a questão da consistência da interface com o usuário para a TV interativa, considerando seus aspectos teóricos e de implementação. Para tanto investigamos na literatura de Interfaces Humano-Computador a questão da consistência e suas abordagens. Considerando que a consistência é uma característica relativa a um modelo, buscamos identificar modelos de interfaces de TV interativa que sejam exemplos de boas práticas a serem seguidas. A metodologia proposta e utilizada é composta por cinco etapas, a saber: modelagem do usuário, análise de tarefas, diretrizes gerais de interface, análise comparativa de plataformas e coordenação da interface. As três primeiras etapas geram recomendações enquanto que a etapa de análise comparativa gera referências. Utilizando estes dois subsídios a etapa de coordenação da interface objetiva elencar exemplos de interfaces que possam se tornar modelos...

O sistema de TV digital interativa está em fase de implantação no Brasil. O middleware Ginga, responsável por permitir a apresentação de programas interativos, prevê que usuários possam interagir com aplicações apresentadas na TV ao pressionar de teclas em um controle remoto. Considerando que controles remotos tradicionais apresentam limitações de usabilidade, este trabalho teve o objetivo investigar a aplicação de conceitos de computação ubíqua, em particular interfaces naturais e multimodais, como alternativas para prover interatividade entre usuários e programas de TV digital. Como resultado, um dispositivo móvel alternativo ao controle remoto tradicional foi utilizado no projeto de novos mecanismos de interação que incluem interfaces baseadas em telas sensíveis ao toque, interfaces sensíveis a gestos capturados por dispositivos que contêm acelerômetros, e interfaces que contêm microfones que permitem entrada de dados por voz. A construção de protótipos correspondentes foi beneficiada pela (assim como beneficiou) implementação prévia de um componente que oferece funcionalidades para envio de dados multimodais para um receptor de TV digital contendo o middleware Ginga, e de um componente que, instalado no receptor...

Ao mesmo tempo em que produções transmídia se tornam cada vez mais comuns, estão ocorrendo mudanças no Brasil que favorecem o aumento do uso de interatividade no dia a dia. Uma das mudanças fundamentais foi a adoção de um sistema de televisão digital terrestre que, em comparação ao sistema analógico, proporciona mais do que recepção de sons e imagens de melhor qualidade em televisores fixos: torna possível receber os sinais de televisão também em dispositivos móveis e portáteis, além de possibilitar a interatividade. Dada a importância da televisão como plataforma de mídia no país (a televisão está presente em 96,9% dos domicílios brasileiros), foi feito um estudo da Qualidade de Experiência (QoE) percebida, com base na avaliação da qualidade do vídeo obtido ao utilizar uma aplicação interativa transmídia de televisão digital terrestre. Foi desenvolvida uma aplicação interativa em linguagem NCL, linguagem declarativa padrão do Sistema Brasileiro de TV Digital Terrestre (ISDB-TB), onde um vídeo secundário é carregado via Internet em banda larga (por streaming) ao mesmo tempo em que o vídeo principal é recebido via radiodifusão. Criou-se um cenário de teste onde foi introduzida, de forma controlada...

This thesis proposes light-field pre-warping methods for measuring and compensating for optical aberrations in focal imaging systems. Interactive methods estimate refractive conditions (NETRA) and model lens opacities (CATRA) of interaction-aware eyes and cameras using cost-efficient hardware apps for high-resolution screens. Tailored displays use stereo-viewing hardware to compensate for the measured visual aberrations and display in-focus information that avoids the need of corrective eyeglasses. A light-field display, positioned very close to the eye, creates virtual objects in a wide range of predefined depths through different sectors of the eye’s aperture. This platform creates a new range of interactivity that is extremely sensitive to spatially-distributed optical aberrations. The ability to focus on virtual objects, interactively align displayed patterns, and detect variations in shape and brightness allows the estimation of the eye’s point spread function and its lens’ accommodation range. While conventional systems require specialized training, costly devices, strict security procedures, and are usually not mobile, this thesis simplifies the mechanism by putting the human subject in the loop. Captured data is transformed into refractive conditions in terms of spherical and cylindrical powers...

Em cooperação com Glorianna Davenport do M.I.T. Media Lab; This paper describes the problems that had to be faced during the elaboration of an interactive narrative for the Instory project (http://img.di.fct.unl.pt/InStory/) directed by Prof. Nuno Correia. The project had the goal of defining and implementing a platform for mobile and cinematic storytelling, information access, and gaming activities, in Quinta da Regaleira (World Heritage) in Sintra, Portugal. The system is driven and validated by a set of fictional threads that are centred on the exploration of physical spaces (the real world, in real time). The development of a narrative was naturally constrained by the environment which raised some practical and theoretical issues in what regards the literary strategies involved. InStory received the PMA Award (2006) for best Portuguese multimedia project web– mobile.

This paper presents a novel, open access interactive platform for 3D medical image analysis, simulation and visualization, focusing in oncology images. The platform was developed through constant interaction and feedback from expert clinicians integrating a thorough analysis of their requirements while having an ultimate goal of assisting in accurately delineating tumors. It allows clinicians not only to work with a large number of 3D tomographic datasets but also to efficiently annotate multiple regions of interest in the same session. Manual and semi-automatic segmentation techniques combined with integrated correction tools assist in the quick and refined delineation of tumors while different users can add different components related to oncology such as tumor growth and simulation algorithms for improving therapy planning. The platform has been tested by different users and over large number of heterogeneous tomographic datasets to ensure stability, usability, extensibility and robustness with promising results.

Stem cells are characterized by their potential for self-renewal and their capacity to differentiate into mature cells. These two key features emerge through the interplay of various factors within complex molecular networks. To provide researchers with a dedicated tool to investigate these networks, we have developed StemCellNet, a versatile web server for interactive network analysis and visualization. It rapidly generates focused networks based on a large collection of physical and regulatory interactions identified in human and murine stem cells. The StemCellNet web-interface has various easy-to-use tools for selection and prioritization of network components, as well as for integration of expression data provided by the user. As a unique feature, the networks generated can be screened against a compendium of stemness-associated genes. StemCellNet can also indicate novel candidate genes by evaluating their connectivity patterns. Finally, an optional dataset of generic interactions, which provides large coverage of the human and mouse proteome...

We present a new approach for constructing and verifying higher-order, imperative programs using the Coq proof assistant. We build on the past work on the Ynot system, which is based on Hoare Type Theory. That original system was a proof of concept, where every program verification was accomplished via laborious manual proofs, with much code devoted to uninteresting low-level details. In this paper, we present a re-implementation of Ynot which makes it possible to implement fully-verified, higher-order imperative programs with reasonable proof burden. At the same time, our new system is implemented entirely in Coq source files, showcasing the versatility of that proof assistant as a platform for research on language design and verification. Both versions of the system have been evaluated with case studies in the verification of imperative data structures, such as hash tables with higher-order iterators. The verification burden in our new system is reduced by at least an order of magnitude compared to the old system, by replacing manual proof with automation. The core of the automation is a simplification procedure for implications in higher-order separation logic, with hooks that allow programmers to add domain-specific simplification rules. We argue for the effectiveness of our infrastructure by verifying a number of data structures and a packrat parser...

This dissertation presents the design and development of an agent-based interactive learning environment based on the Mathema Model. Such model adopts a problem-based learning approach as a pedagogical method that is achieved in an interaction environment that is populated by software and human agents (students and teachers), working together in favour of the human learners. This interaction occurs aiming at helping human learners to solve problems into given knowledge domain. This model aims to help learners during several phases involved in the build solution process, including the problem analysis. With this sense, the interaction between three agent categories was modeled: human learner agent, teacher and artificial tutoring agent. This work proposes a platform for building agent-based interactive learning environments, supporting as framework to developers/software engineers as authoring to non developers users like teachers and knowledge engineers. In addition, the platform has collaborative tools, an ontology-based infrastructure and an agent society that help at the domain modeling and problem solving process (through artificial intelligence techniques). It was conducted two case studies (at legal domain and health domain) and an initial investment at mathematical domain that demonstrate that the proposed platform is feasible.; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; O presente trabalho aborda a concepção e desenvolvimento de ambientes interativos de aprendizagem (AIAs) baseados em agentes...

This paper describes an interactive platform for the semantic annotation of oriented iconographic sources based on an accurate 3D model structured according to spatial and temporal features. This platform, called LOCUS IMAGINIS, provides access to cultural information about monuments by collecting personal snapshots taken by visitors. In particular, the platform enables to perform two actions. Firstly, pictures are added into the database: visitors manually align images to the digital model of the monument and than, by means of automatic procedures, images are enriched with 2D semantic annotations that are projected from the 3D model. Secondly, the collection of semantically-enriched data can be queried: when visitors select 2D images of the database, these are oriented in the 3D scene and superimposed onto the 3D model. In this way, this tool provides access to textual and graphic information describing the photographed site (semantic, spatial, temporal features, etc.). Moreover, visitors can interact both with images and the 3D-model to highlight building parts by color. Accessible on-site and on-line, this tool can create awareness about conservation and is adapted to all kinds of audience: students involved in educational workshops...

This paper presents an interactive platform for image information mining referred to as the switchboard. The switchboard is a dynamic object that interfaces with a hierarchical image representation structure. The latter is often a tree structure that is used as an intermediate between the image space and a multi-dimensional feature space inferred from it. The switchboard hosts the feature space and facilitates its bidirectional interactivity with the image space through the underlying tree. Its design ensures operability independent of the type of tree it interfaces with. Its functionality is demonstrated using the Alpha-Tree structure for mining building footprints from remote sensing imagery.; JRC.G.2-Global security and crisis management

The need for a collaborative approach that can easily manifest the basic ideas into a semantic enriched Virtual Environment is felt. To realize the same, a clear combination of two individual processes is applied. Beginning with the manipulation and semantic addition to 2-Dimensional geometric shapes, a concise 3D model is generated. The latter serves as an input to a much interactive system, e.g., a CAVE, for better visualization and interaction with the model. The idea became completed by joining table-touch and real-scale 3D visualization system. However, on question remained unknown ``what is the effect of this kind of visualization on an end-user?'' This paper tries to find out an appropriate answer to the question only in terms of gender difference. The results show significant difference between female and male populations.

Adapting technological environments to users is a concern since Mark Weiser launched the concept of ubiquitous computing and, in order to do that, is necessary to understand users’ characteristics. In this context, the purpose of this paper is to present a study about students’ mobility habits within a university campus, having the intention of getting insights towards the best place to set an interactive public display and of predicting the main characteristics of the audience that will be present on that spot in forthcoming periods. Thus, the envisioned results of this work will allow the adaptation of the contents exhibited on the device to the audience. To perform the study, a set of logs of accesses to the university’s Wi-Fi was used, data mining techniques were implemented and forecasting models were built, using the line of work suggested by the CRISP-DM methodology. As result, students profile were built based on past wireless accesses and on their scholar schedules, and three time series models were used (Holt-Winters, Seasonal Naive and Simple Exponential Smoothing) to predict the presence of students on the envisioned spot in future periods.

OBJECTIVE: The current study evaluates the usability perception of an e-therapeutic platform (supported by electronic processes and communication), aiming to promote the behavior change and to improve the adolescent health status through increased and interactive contact between the adolescent and the clinical staff. METHODS: This was a correlational study with a sample of 48 adolescents (12-18 years) who attended a Pediatric Obesity Clinic between January and August of 2012. Participants were invited to access, during 24 weeks, the e-therapeutic multidisciplinary platform (Next.Step) in addition to the standard treatment program. A usability questionnaire was administered and the platform performance and utilization indicators were analyzed. RESULTS: The users' perception of satisfaction, efficiency, and effectiveness regarding the Next.Step platform was clearly positive. However, only 54.17% of the enrolled adolescents accessed the platform, with a mean task-completion rate of 14.55% (SD = 18.853). The higher the number of the platform consulted resources, the greater the tendency to enjoy the platform, to consider it exciting and quick, to consider that the time spent in it was useful, to consider the access to information easy...

O Projeto T&D-Bench (Teaching and Design Workbench) tern como objetivo fornecer um ambiente didático para fins de avaliação de desempenho de processadores utilizando modelagem e simulação interativas visuais. A aplicação dos conceitos de orientação a objetos (abstração, encapsulamento, herança e polimorfismo) em modelagem de hardware vem sendo amplamente discutida na literatura. Entre os benefícios que este paradigma traz para os modelos de hardware pode-se citar: maior responsabilidade dos modelos, melhor documentação e facilidade de manutenção. O ambiente SIMOO é composto por uma biblioteca de classes e por uma ferramenta gráfica (MET - Model Edition Tool). Este ambiente, utilizado como plataforma para o desenvolvimento deste trabalho, é um ambiente genérico para modelagem e simulação de sistema discretos no qual os modelos sAo construídos de maneira hierárquica e utilizam os conceitos de orientação a objetos como metodologia de projeto e implementação. Este trabalho é a primeira etapa de desenvolvimento do projeto T&D-Bench e iniciou com a modelagem dos processadores Intel 8051 e DLX. Com isso foi possível identificar componentes de arquitetura de processadores que pudessem ser generalizados. As classes genéricas...

This article presents a summary of a reserach report into the state of interactive television and the different systems for interaction with television developed by the regulating authority in Catalonia (Spain). The context of the study is the European continent and it covers theoretical, tecnological and programming issues. The autors propose an operayive definition of interactive television as a tool for developing their field of study and an original typological proposal than can classify and analyse the whole range of the present offer of interactive programs and services. Also presented throughout the article is an analysis of the different interactive services in the European continent. To end, the authors propose a whole series of recommendations for the regulating authority as measures for promoting theses types of services and applications, with particular emphasis on the role that Digital Terrestrial Television could play as a universalizing platform for access to the new services of the Information Society. Mention is made of the specific case of Catalonia as an example of the measures that should be observed for the full and integrated development of the services that are generically known as interactive television.

L'actual diversitat de dispositius de consum amb accés a Internet fa possible una gran varietat de plataformes multimèdia per accedir a contingut audiovisual, serveis interactius, jocs i tot tipus d'aplicacions d'usuari. El concepte de televisió digital està evolucionant des de ser considerada una tecnologia unidireccional i relativament aïllada a formar part de l'ecosistema de serveis que l'usuari te disponible des de qualsevol entorn multimèdia, com la pròpia llar. En aquest context, la convergència entre televisió, Internet i aplicacions és una realitat gràcies a extensa família de dispositius intel·ligents que hi ha al mercat. Las Smart TVs, smartphones, tablets i consoles permeten als usuaris accedir a continguts de televisió i aplicacions interactives a través múltiples xarxes. El nombre I varietat de format d'aplicacions i entorns d'execució que actualment permeten accedir a algun tipus de televisió interactiva (iTV) dificulten la portabilitat de les aplicacions desenvolupades entre diferents entorns. La manca d'un estàndard unificat i acceptat a nivell mundial per al desplegament de continguts interactius en plataformes de televisió requereix de tècniques especials per adaptar els continguts d'una plataforma a una altra. Així...

This interactive project allows users to explore modern graphics and traditional Chinese ink painting by using a Nintendo WiiRemote control. The purpose of this project is to provide an effortless platform for users to create an artwork with simple control. Moreover, the default patterns let users have multiple choices to paint the scene, and even though users do not have any art, design background, or experience, they can still create their own masterpiece easily.

The first contact of students with logic is not straightforward since they are not familiar with its notation and with logical thinking. For this discipline to become more attractive and in order to avoid this intimidating first contact, interactive didactic tools can be useful. In the University of Aveiro there exists a group of teachers developing an interactive platform that provides students some guidance in their independent study in several courses. We propose and describe the use of this platform as a complement for teaching the logic course of Mathematics Department in this University.