Papers by Daniela Trevisan
Anais Estendidos do XXIII Simpósio de Realidade Virtual e Aumentada (SVR Estendido 2021)
Virtual reality (VR) and head-mounted displays are constantly gaining popularity in various field... more Virtual reality (VR) and head-mounted displays are constantly gaining popularity in various fields such as education, military, entertainment, and health. Although such technologies provide a high sense of immersion, they can also trigger symptoms of discomfort. This condition is called cybersickness (CS) and is quite popular in recent VR publications. This work proposes a novel experimental analysis using symbolic machine learning to rank potential causes of CS in VR games. We estimate CS causes and rank them according to their impact on the classical machine learning classification task. Experiments are performed using two VR games and 6 experimental protocols along with 37 valid samples from a total of 88 volunteers.
Anais do Computer on the Beach, 2018
Uma das maiores dificuldades atuais relacionadas a producao de conteudos da Web 2.0 esta em como ... more Uma das maiores dificuldades atuais relacionadas a producao de conteudos da Web 2.0 esta em como cria-los e mante-los acessiveis a longo prazo para usuarios deficientes visuais. Neste sentido, este trabalho apresenta uma analise comparativa dos tres principais editores HTML WYSIWYG, uteis na producao de conteudo acessivel. Consideramos em nossa analise, caracteristicas relevantes dos editores e dados coletados em testes com usuarios. Os resultados nos levam a entender que a comunicacao sobre a conformidade dos conteudos acessiveis ainda nao e completamente clara para usuarios que nao sejam especialistas e sao necessarios novas estrategias para melhorar e suportar a qualidade da producao.
for dissemination) This deliverable provides a collection of chapters describing various challeng... more for dissemination) This deliverable provides a collection of chapters describing various challenges and ongoing work on usability and evaluation within the areas of spoken multimodal dialogue systems, visionbased systems, haptics-based systems, mixed-reality systems in surgery, and tools for remote usability evaluation.
Proceedings of the 18th Annual International Conference on Digital Government Research
Urban data is gradually being opened to the public. Tools for exploitation, analysis and discover... more Urban data is gradually being opened to the public. Tools for exploitation, analysis and discovery of new knowledge in large data sets are the key to enable citizens to make sense of such large amount of data. The purpose of this work is to analyze how data analysis associated with visualization techniques in different levels can lead to the improvement of the interpretability of open data. With the support of machine learning techniques, these visualizations may improve pattern identification in urban data sets. To guide our discussion, a case study was conducted analyzing socioeconomic data released by the Chicago city government. We discussed the use of different visualizations in this scenario, tailored for univariate, bivariate and multivariate analysis. We also performed an evaluation of the different forms of visualization proposed in this work. We could observe that allowing the user to explore open urban data using some specific visualizations may lead to more effective data interpretation.
2018 22nd International Conference Information Visualisation (IV)
Visualizing data in tables usually is not the best way to help users understanding large amounts ... more Visualizing data in tables usually is not the best way to help users understanding large amounts of data. Instead, data visualization in graphical format, such as charts, has been used to explore available data. A good data visualization is defined as a well-designed presentation of interesting data, aiming to communicate ideas with clarity, precision and efficiency. Nowadays, considering the open data movement, many open data portals offer different types of data visualization. However, when browsing some of these portals, we can find many bad data visualizations, frequently ambiguous, confusing and unusable. Hence, it is essential to have an instrument capable of analyzing the quality of data visualizations, helping the designer to use the full capacity of a data visualization to provide a more efficient resource information to the users. This work aims to present an instrument that integrate a set of heuristics to assess the quality of data visualizations. Such heuristics were chosen due to have been previously proposed in several works in literature, and proved successful. To evaluate the proposed instrument, we conducted an experiment with a group composed by computer science graduate students. We analyzed the results using Cohen’s Kappa and Any-two agreement statistical tests, which indicated that the instrument is adequate.
... Pour référencer ce document, veuillez utiliser le lien suivant : http://hdl.handle. net/2078/... more ... Pour référencer ce document, veuillez utiliser le lien suivant : http://hdl.handle. net/2078/17945. Description of an Image Guided Application Using Contextual Focus Driven Interaction. Auteurs. Trevisan, Daniela; ...
Urban data is gradually being opened to the public. Tools for exploitation, analysis and discover... more Urban data is gradually being opened to the public. Tools for exploitation, analysis and discovery of new knowledge in large data sets are the key to enable citizens to make sense of such large amount of data. The purpose of this work is to analyze how data analysis associated with visualization techniques in different levels can lead to the improvement of the interpretability of open data. With the support of machine learning techniques, these visualizations may improve pattern identification in urban data sets. To guide our discussion, a case study was conducted analyzing socioeconomic data released by the Chicago city government. We discussed the use of different visualizations in this scenario, tailored for univariate, bivariate and multivariate analysis. We also performed an evaluation of the different forms of visualization proposed in this work. We could observe that allowing the user to explore open urban data using some specific visualizations may lead to more effective dat...
Visualizing data in tables usually is not the best way to help users understanding large amounts ... more Visualizing data in tables usually is not the best way to help users understanding large amounts of data. Instead, data visualization in graphical format, such as charts, has been used to explore available data. A good data visualization is defined as a well-designed presentation of interesting data, aiming to communicate ideas with clarity, precision and efficiency. Nowadays, considering the open data movement, many open data portals offer different types of data visualization. However, when browsing some of these portals, we can find many bad data visualizations, frequently ambiguous, confusing and unusable. Hence, it is essential to have an instrument capable of analyzing the quality of data visualizations, helping the designer to use the full capacity of a data visualization to provide a more efficient resource information to the users. This work aims to present an instrument that integrate a set of heuristics to assess the quality of data visualizations. Such heuristics were ch...
Anais do XXVI Simpósio Brasileiro de Informática na Educação (SBIE 2015), 2015
This work investigates techniques to the development of a delivery tool of Enem test through the ... more This work investigates techniques to the development of a delivery tool of Enem test through the computer in order to meet the specific accessibility needs of candidates with full and partial visual impairment. After the identification of appropriate techniques, we conducted an experimental analysis to determine if they are able to properly deliver the content of the exam to this audience. Finally, we propose the application of the techniques identified creating a functional prototype that will serve to accomplish testing with real users, necessary for the identification of possible accessibility and usability problems. Resumo. Este trabalho investiga técnicas apropriadas para o desenvolvimento de uma ferramenta de entrega da prova do Enem por meio do computador, de forma a atender as necessidades de acessibilidade específicas de candidatos com deficiência visual total e parcial. Após a identificação das técnicas apropriadas, realizamos uma análise experimental para determinar se estas são capazes de entregar corretamente o conteúdo do exame a este público. Por fim, propomos a aplicação das técnicas identificadas na criação de um protótipo funcional que servirá para realizarmos testes com usuários reais, necessários para a identificação de possíveis problemas não somente de acessibilidade, mas também de usabilidade.
The increase of Head Mounted Display systems in games is a natural tendency for the next generati... more The increase of Head Mounted Display systems in games is a natural tendency for the next generation of digital entertainment. While the immersion produced by those devices is high, discomfort is still a problem pointed by many users. In such context, this work proposes to reduce the discomfort caused by the lack of focus in these display interfaces. More specifically, we propose a dynamic selection of focus elements aiming to reduce visual discomfort in firstperson navigation through immersive virtual environments (Figure 1). Behind the proposed effect, a heuristic model of visual attention is proposed sustaining a real-time selection of the on focus target. While most approaches use a simple point and focus selection, our solution creates a novel and more precise focus selection, considering different scene elements and attributes. A case of study of the model was made developing a component for a commercial game engine. It was tested by a set of users that explore a virtual scene ...
2020 22nd Symposium on Virtual and Augmented Reality (SVR)
2020 IEEE 8th International Conference on Serious Games and Applications for Health (SeGAH)
Anais Estendidos do Simpósio de Realidade Virtual e Aumentada (SVR)
Virtual Reality (VR) is an upcoming trend in games and entertainment applications as the use of h... more Virtual Reality (VR) is an upcoming trend in games and entertainment applications as the use of head-mounted displays becomes accessible for the mass market. These systems aim to provide immersive experiences, but they still do not provide a completely seamless experience, mostly due to sickness symptoms that can be experienced by the players. Cybersickness (CS) is one of the most critical problems that make the game industry fearful for higher investments. In this work, we made a critical study on the theories and causes of CS in virtual environments. We unified in a paper most of the leading hardware and software proposals to identify, quantify and minimize the main sickness problems. We also provide clarification about the most relevant measurement tools used to quantify the level of sickness for one or more players through specific questionnaires. We also developed a demo plugin for a commercial game engine to collect relevant data in a VR game to use as a database to future res...
Lecture Notes in Computer Science, 2007
This work introduces the design of a multimodal application allowing the user to sculpt 3D medica... more This work introduces the design of a multimodal application allowing the user to sculpt 3D medical data. We are considering interaction modalities such as blowing and gesture to segment the 3D data visualized. Besides we present a multimodal platform for the rapid development of multimodal interactive systems as a central tool for an iterative user-centered design process.
tecgraf.puc-rio.br
Resumo A aproximação entre as interfaces do tipo 2D e 3D está indicando uma nova área de pesquisa... more Resumo A aproximação entre as interfaces do tipo 2D e 3D está indicando uma nova área de pesquisa e desenvolvimento, porém esta integração ainda é um problema em aberto. Por exemplo, enquanto as interfaces 2D do tipo WIMP (Windows, Icons, Menu and Pointer ...
UCL-TELE and BCHI, Université Catholique de Louvain, SIMILAR Report D, 2004
... Pour référencer ce document, veuillez utiliser le lien suivant : http://hdl.handle. net/2078/... more ... Pour référencer ce document, veuillez utiliser le lien suivant : http://hdl.handle. net/2078/17945. Description of an Image Guided Application Using Contextual Focus Driven Interaction. Auteurs. Trevisan, Daniela; ...
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Papers by Daniela Trevisan