Abstract Likert scale data correspond to data collected from questionnaires, where there are seve... more Abstract Likert scale data correspond to data collected from questionnaires, where there are several statements about a fact, situation, design or technique, and the respondents must specify their level of agreement with each statement by marking one of several ordered alternatives. Often, five choices are posed to respondents (strongly agree, agree, neither agree nor disagree, disagree and strongly disagree) for each statement. Data obtained with such surveys are translated to numerical scores to undergo statistical analysis, and are ...
Abstract Likert scale data correspond to data collected from questionnaires, where there are seve... more Abstract Likert scale data correspond to data collected from questionnaires, where there are several statements about a fact, situation, design or technique, and the respondents must specify their level of agreement with each statement by marking one of several ordered alternatives. Often, five choices are posed to respondents (strongly agree, agree, neither agree nor disagree, disagree and strongly disagree) for each statement. Data obtained with such surveys are translated to numerical scores to undergo statistical analysis, and are ...
ABSTRACT In the last decade, several specialized tools have been created upon similarity function... more ABSTRACT In the last decade, several specialized tools have been created upon similarity functions that, given a keyword and a context, determine the degree of similarity (or probability) that information in a dataset corresponds to the user's query. Quite often such tools are meant for experts and require training and knowledge on the application domain to be used. However, given the huge amount of information available on the Web, resolving ambiguities becomes a daily task for most users. In this paper, we present a technique for embedding into a Web browser tools for solving ambiguities between keywords that users might found while navigating the Web. A prototype illustrating such techniques has been developed as a proof of concept. The tool presents the degree of similarity directly on Web pages as a contextual help menu. The overall approach includes different datasets and similarity functions and is flexible enough to support extensions for covering additional contexts of use.
The Computer Graphics, Image Processing and Interaction (CGIP) group at UFRGS concentrates expert... more The Computer Graphics, Image Processing and Interaction (CGIP) group at UFRGS concentrates expertise from many different and complementary graphics related domains. In this paper we introduce the group and present our re- search lines and some ongoing projects. We selected mainly the projects related to 3D interaction and navigation, which includes applications as massive data visualization, surgery planning and simulation, tracking and computer vision algorithms, and modeling approaches for human perception and natural world.
The Computer Graphics and Interaction group at UFRGS has a well-established tradition of working ... more The Computer Graphics and Interaction group at UFRGS has a well-established tradition of working in the subject of interactive visualization. With publications in the main venues of the field, such as the IEEE Visualization and Eurovis conferences, or journals such as IEEE TVCG (Transactions on Visualization and Computer Graphics) and Computer Graphics Forum (CGF), the group has consistently produced research in the area of interactive visualization throughout the years. Along the visualization group from USP-Sa ̃o Carlos, it organized the two previous instances of the workshop on interactive visualization, held at Sibgrapi 2007 and 2010. In this paper we summarize the recently published research in the period of 2010 to today. We also describe ongoing projects, that we hope can promote discussions and foster collaborations with other research groups.
Some of the search tasks users perform on the Web aim at complementing the information they are c... more Some of the search tasks users perform on the Web aim at complementing the information they are currently reading in a Web page: they are ancillary search tasks. Currently, the standard way to support such ancillary searches follows an inside-out approach, which means that query results are shown in a new window/tab or as a replacement of the current page. We claim that such inside-out approach is only suitable if users really want to dissociate the search results from the Web page they were reading. In this paper we propose an alternative approach, called "inside-in", where query results are displayed inside the Web page next to the keyword that motivated the user to launch an ancillary search. In order to demonstrate the feasibility of our approach we have developed a tool that embeds an egocentric information visualization technique in the Web page. This tool supports nested queries and allows the display of multiple data attributes. The approach is illustrated by a case study based on ancillary searches of co authors from a digital library. The paper also reports some preliminary results obtained with an experiment conducted with remote users.
Proceedings of the 15th French-speaking conference on human-computer interaction on 15eme Conference Francophone sur l'Interaction Homme-Machine - IHM 2003, 2003
... Multimodale dans une Application de Réalité Virtuelle Immersive Amélie Schyn, DavidNavarre, P... more ... Multimodale dans une Application de Réalité Virtuelle Immersive Amélie Schyn, DavidNavarre, Philippe Palanque LIIHS - IRIT, 118, route de Narbonne 31062, Toulouse, France {schyn, palanque, navarre}@irit.fr Luciana Porcher Nedel ...
Proceedings of the working conference on Advanced visual interfaces - AVI '08, 2008
Page 1. A Physics-based Approach for Interactive Manipulation of Graph Visualizations Andre Susli... more Page 1. A Physics-based Approach for Interactive Manipulation of Graph Visualizations Andre Suslik Spritzer Instituto de Informática Universidade Federal do Rio Grande do Sul Caixa Postal 15064 91.501-970 Porto Alegre, RS Brazil spritzer@inf.ufrgs.br ...
Problems related to navigation are known as the most frequently reported by users when browsing l... more Problems related to navigation are known as the most frequently reported by users when browsing large Web sites. Users become quickly lost in large collections of pages especially if little contextual information is given to explore the information space. In this paper, we discuss the importance of providing users with a unified representation of structure and navigation information of Web sites as a way to prevent the lost-in-space phenomena. We present a notation to support navigation design of Web applications, the StateWebCharts, which explicitly represent structure and navigation in a seamless way. The Bifocal Tree, a technique originally developed for visualizing hierarchical structures, is extended and used to display StateWebCharts specifications, taking advantage of their characteristics to represent both structure and navigation information.
Abstract Likert scale data correspond to data collected from questionnaires, where there are seve... more Abstract Likert scale data correspond to data collected from questionnaires, where there are several statements about a fact, situation, design or technique, and the respondents must specify their level of agreement with each statement by marking one of several ordered alternatives. Often, five choices are posed to respondents (strongly agree, agree, neither agree nor disagree, disagree and strongly disagree) for each statement. Data obtained with such surveys are translated to numerical scores to undergo statistical analysis, and are ...
Abstract Likert scale data correspond to data collected from questionnaires, where there are seve... more Abstract Likert scale data correspond to data collected from questionnaires, where there are several statements about a fact, situation, design or technique, and the respondents must specify their level of agreement with each statement by marking one of several ordered alternatives. Often, five choices are posed to respondents (strongly agree, agree, neither agree nor disagree, disagree and strongly disagree) for each statement. Data obtained with such surveys are translated to numerical scores to undergo statistical analysis, and are ...
ABSTRACT In the last decade, several specialized tools have been created upon similarity function... more ABSTRACT In the last decade, several specialized tools have been created upon similarity functions that, given a keyword and a context, determine the degree of similarity (or probability) that information in a dataset corresponds to the user's query. Quite often such tools are meant for experts and require training and knowledge on the application domain to be used. However, given the huge amount of information available on the Web, resolving ambiguities becomes a daily task for most users. In this paper, we present a technique for embedding into a Web browser tools for solving ambiguities between keywords that users might found while navigating the Web. A prototype illustrating such techniques has been developed as a proof of concept. The tool presents the degree of similarity directly on Web pages as a contextual help menu. The overall approach includes different datasets and similarity functions and is flexible enough to support extensions for covering additional contexts of use.
The Computer Graphics, Image Processing and Interaction (CGIP) group at UFRGS concentrates expert... more The Computer Graphics, Image Processing and Interaction (CGIP) group at UFRGS concentrates expertise from many different and complementary graphics related domains. In this paper we introduce the group and present our re- search lines and some ongoing projects. We selected mainly the projects related to 3D interaction and navigation, which includes applications as massive data visualization, surgery planning and simulation, tracking and computer vision algorithms, and modeling approaches for human perception and natural world.
The Computer Graphics and Interaction group at UFRGS has a well-established tradition of working ... more The Computer Graphics and Interaction group at UFRGS has a well-established tradition of working in the subject of interactive visualization. With publications in the main venues of the field, such as the IEEE Visualization and Eurovis conferences, or journals such as IEEE TVCG (Transactions on Visualization and Computer Graphics) and Computer Graphics Forum (CGF), the group has consistently produced research in the area of interactive visualization throughout the years. Along the visualization group from USP-Sa ̃o Carlos, it organized the two previous instances of the workshop on interactive visualization, held at Sibgrapi 2007 and 2010. In this paper we summarize the recently published research in the period of 2010 to today. We also describe ongoing projects, that we hope can promote discussions and foster collaborations with other research groups.
Some of the search tasks users perform on the Web aim at complementing the information they are c... more Some of the search tasks users perform on the Web aim at complementing the information they are currently reading in a Web page: they are ancillary search tasks. Currently, the standard way to support such ancillary searches follows an inside-out approach, which means that query results are shown in a new window/tab or as a replacement of the current page. We claim that such inside-out approach is only suitable if users really want to dissociate the search results from the Web page they were reading. In this paper we propose an alternative approach, called "inside-in", where query results are displayed inside the Web page next to the keyword that motivated the user to launch an ancillary search. In order to demonstrate the feasibility of our approach we have developed a tool that embeds an egocentric information visualization technique in the Web page. This tool supports nested queries and allows the display of multiple data attributes. The approach is illustrated by a case study based on ancillary searches of co authors from a digital library. The paper also reports some preliminary results obtained with an experiment conducted with remote users.
Proceedings of the 15th French-speaking conference on human-computer interaction on 15eme Conference Francophone sur l'Interaction Homme-Machine - IHM 2003, 2003
... Multimodale dans une Application de Réalité Virtuelle Immersive Amélie Schyn, DavidNavarre, P... more ... Multimodale dans une Application de Réalité Virtuelle Immersive Amélie Schyn, DavidNavarre, Philippe Palanque LIIHS - IRIT, 118, route de Narbonne 31062, Toulouse, France {schyn, palanque, navarre}@irit.fr Luciana Porcher Nedel ...
Proceedings of the working conference on Advanced visual interfaces - AVI '08, 2008
Page 1. A Physics-based Approach for Interactive Manipulation of Graph Visualizations Andre Susli... more Page 1. A Physics-based Approach for Interactive Manipulation of Graph Visualizations Andre Suslik Spritzer Instituto de Informática Universidade Federal do Rio Grande do Sul Caixa Postal 15064 91.501-970 Porto Alegre, RS Brazil spritzer@inf.ufrgs.br ...
Problems related to navigation are known as the most frequently reported by users when browsing l... more Problems related to navigation are known as the most frequently reported by users when browsing large Web sites. Users become quickly lost in large collections of pages especially if little contextual information is given to explore the information space. In this paper, we discuss the importance of providing users with a unified representation of structure and navigation information of Web sites as a way to prevent the lost-in-space phenomena. We present a notation to support navigation design of Web applications, the StateWebCharts, which explicitly represent structure and navigation in a seamless way. The Bifocal Tree, a technique originally developed for visualizing hierarchical structures, is extended and used to display StateWebCharts specifications, taking advantage of their characteristics to represent both structure and navigation information.
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Papers by Carla Dal Sasso Freitas