Papers by Didier Vega-Oliveros
An approach based on multiple text input modes for interactive digital TV applications
... The project was conducted using a set of techniques that aim to engage the end user during al... more ... The project was conducted using a set of techniques that aim to engage the end user during all stages of development, known as User Centered Design [9]. First, we did a requirement elicitation with potential users and experts in the area. ...
Operadores de interação multimídia para criação automática de documentos: Interactors
... Em: Webmedia '09: Proc. ... ao longo do tempo. Aplicações de captura e acesso podem proc... more ... Em: Webmedia '09: Proc. ... ao longo do tempo. Aplicações de captura e acesso podem processar informações capturadas da interação natural do usuário com o ambiente (via tinta eletrônica,voz e vídeo, por exemplo) e fazer uso de informações de contexto adquiridas, por ...
Proceedings of the XV Brazilian Symposium on Multimedia and the Web - WebMedia '09, 2009
The emergence of social media increases the need for the recognization of social influence mainly... more The emergence of social media increases the need for the recognization of social influence mainly motivated by online advertising, political and health campaigns, recommendation systems, epidemiological study, etc. In spreading processes, it is possible to define the most central or influential vertices according to the network topology and dynamic. On the other hand, the least influential spreaders have been disregarded. This paper aims to maximize the mean of information propagation on the network by recognizing the non influential individuals by making them better spreader. Experimental results confirm that selecting 0.5% of least influential spreaders in three social networks (google+, hamsterster and advogato) and rewiring one connection to some important vertex, increase the propagation over the entire network.
Work in progress — Alternative interfaces for e-learning platforms used in remote areas
Several studies show that distance learning is a viable way to provide quality education in areas... more Several studies show that distance learning is a viable way to provide quality education in areas of difficult access. In the Amazon state, in Brazil, a region where most towns have no roads and transport is primarily via rivers, some projects have gained notoriety for providing effective results in education. These initiatives provide inclusion of people who live in geographically isolated cities. This article discusses the use of a web-based e-learning platform in a region with no high speed internet available and uses Digital TV as an alternative. The software developed using the Brazilian Digital TV pattern and its middleware called GINGA. This paper reports a study on how the extensions can be used. The software developed is an alternative to help these students that lived in isolated areas. The study case was applied to the Federal Institute College from Amazon (IFAM) that offers technician courses as environment and tourism. This Project observed the internet quality and proposes the use of Digital TV as a good option to local with restrictions from the Internet. To prove the viability of the software developed, we made an experimental test with real users. We conducted usability evaluations using the think aloud protocol and used a control group to compare the learning level of two groups. The first students group use the Digital TV software and the second group the web-based tool, after watching the class they answer five questions about the class content.
This conversation will be recorded: automatically generating interactive documents from captured media
Synchronous communication tools allow remote users to collaborate by exchanging text, audio, imag... more Synchronous communication tools allow remote users to collaborate by exchanging text, audio, images or video messages in synchronous sessions. In some scenarios, it is paramount that collaborative synchronous sessions be recorded for later review. In particular in the case of web conferencing tools, the approach usually adopted for recording a meeting is to generate a linear video with the content of the exchanged media. Such approach limits the review of a meeting to users watching a video using traditional timeline-
based video controls. In this work we advocate that interactive multimedia documents can be generated automatically as a result of capturing a synchronous session. We outline our approach presenting a case of study involving remote communication, and detail the generation of a multimedia document by means of operators focusing on the interaction among the collaborating users.
Interactors: operators to automatically generate interactive multimedia documents from captured media
In some scenarios, it is paramount that collaborative synchronous sessions be recorded for later ... more In some scenarios, it is paramount that collaborative synchronous sessions be recorded for later review. Particularly in the case of webconferencing tools, the approach usually adopted for recording a meeting is to generate a linear video with the content of the exchanged media. Such approach limits the review of the meeting to the user watching a video using the traditional timeline-based video controls. In this work we advocate that synchronous communication tools generate interactive multimedia documents as a result of a session. For this purpose we detail the generation of an interactive multimedia document by means of user-media operators (e.g. slide changes, chat messages, ink-based interactions, audio events) that we call Interactors, enabling users to browse the generated document by navigating points of interest in the captured media. We de fine the Interactors approach and demonstrate it in the context of a tool in use
Automatic authoring of interactive multimedia documents via media-oriented operators
ACM Sigapp Applied Computing Review, 2011
When capturing multimedia records of collaborative activities (e.g. lectures, meetings, etc.), la... more When capturing multimedia records of collaborative activities (e.g. lectures, meetings, etc.), later access to the captured activity is usually provided by a linear video comprising the contents of the exchanged media. Such alternative impairs the review of the activity to the extent that the user only counts on the traditional timeline-based video controls. In scenarios in which automated tools generate
This conversation will be recorded": automatically generating interactive documents from captured media
Page 1. This Conversation Will Be Recorded: Automatically Generating Interactive Documents from... more Page 1. This Conversation Will Be Recorded: Automatically Generating Interactive Documents from Captured Media Didier A. Vega-Oliveros Diogo Santana Martins Maria da Graça C. Pimentel Universidade de São Paulo, São ...
Media-oriented operators for authoring interactive multimedia documents generated from capture sessions
Page 1. Media-oriented operators for authoring interactive multimedia documents generated from ca... more Page 1. Media-oriented operators for authoring interactive multimedia documents generated from capture sessions Didier A. Vega-Oliveros, Diogo S. Martins, Maria da Graça C. Pimentel Universidade de São Paulo São Carlos, SP Brazil {davo,diogosm,mgp}@icmc.usp.br ...
Viewing by interactions: media-oriented operators for reviewing recorded sessions on tv
... Collaborative synchronous video annotation via the watch-and-comment paradigm. In Proceedings... more ... Collaborative synchronous video annotation via the watch-and-comment paradigm. In Proceedings of the seventh european conference on European interactive television conference, EuroITV '09, pages 67--76, New York, NY, USA, 2009. ACM. 26. AS Pentland. ...
An approach based on multiple text input modes for interactive digital TV applications
... The project was conducted using a set of techniques that aim to engage the end user during al... more ... The project was conducted using a set of techniques that aim to engage the end user during all stages of development, known as User Centered Design [9]. First, we did a requirement elicitation with potential users and experts in the area. ...
Semi-supervised learning (SSL) stands out for using a small amount of labeled points for data clu... more Semi-supervised learning (SSL) stands out for using a small amount of labeled points for data clustering and classification. In this scenario graph-based methods allow the analysis of local and global characteristics of the available data by identifying classes or groups regardless data distribution and representing submanifold in Euclidean space. Most of methods used in literature for SSL classification do not worry about graph construction. However, regular graphs can obtain better classification accuracy compared to traditional methods such as k-nearest neighbor (kNN), since kNN benefits the generation of hubs and it is not appropriate for high-dimensionality data. Nevertheless, methods commonly used for generating regular graphs have high computational cost. We tackle this problem introducing an alternative method for generation of regular graphs with better runtime performance compared to methods usually find in the area. Our technique is based on the preferential selection of vertices according some topological measures, like closeness, generating at the end of the process a regular graph. Experiments using the global and local consistency method for label propagation show that our method provides better or equal classification rate in comparison with kNN.
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Papers by Didier Vega-Oliveros
based video controls. In this work we advocate that interactive multimedia documents can be generated automatically as a result of capturing a synchronous session. We outline our approach presenting a case of study involving remote communication, and detail the generation of a multimedia document by means of operators focusing on the interaction among the collaborating users.