Papers by Daniel Gonçalves
Anais do XX Congresso Brasileiro de Engenharia Química, 2015
Anais do XX Congresso Brasileiro de Engenharia Química, 2015
Anais do XX Congresso Brasileiro de Engenharia Química, 2015
Lecture Notes in Computer Science, 1998
Abstract. Many systems have been already developed concerning agent teams in a world with obstacl... more Abstract. Many systems have been already developed concerning agent teams in a world with obstacles. One of the problems of such systems lies on how to maintain a pre-defined formation when we have several agents moving in the world.In this paper we defend that, in order to ...
Proceedings of the 11th international conference on Intelligent user interfaces - IUI '06, 2006
Traditional ways to help users organize and retrieve their documents don't scale well, nor do the... more Traditional ways to help users organize and retrieve their documents don't scale well, nor do they properly handle non-textual documents. This paper evaluates narrativebased interfaces as a natural and effective alternative for document retrieval. We have identified what shape document-describing stories take, and what contents to expect. This led to an interface that is able to capture stories, and a knowledge-based infrastructure to understand them. A prototype of the interface was used to validate narrativebased interfaces, with emphasis on story accuracy. To this end, we collected thirty stories whose contents were then compared to the documents they portrayed. Results allow us to conclude that, for the most part, such stories are trustworthy enough to allow humans to retrieve documents reliably (81%-91% of all information is correct). We also confirmed that stories told to a computer are similar to those told to human interviewers.
International Conference on Intelligent User Interfaces, Proceedings IUI, 2008
Most computer users find organizing large amounts of personal information problematic. Often, hie... more Most computer users find organizing large amounts of personal information problematic. Often, hierarchies are the sole means to do it. However, users can remember a broader range of autobiographic contextual data about their personal items. Unfortunately, it can seldom be used to manage and retrieve them. Even when this is possible, it is often done by asking users to fill in values for arbitrary properties in dialog boxes or wizards. We propose that narrative-based interfaces can be a natural and effective way to help users recall relevant autobiographic data about their personal items and convey it to the computer. Using Quill, a narrative-based personal document retrieval interface, as a case-study, we show how such an interface can be designed. We demonstrate the approach's validity based on a set of user studies, discussing how the problems raised by the evaluation of such an interface were overcome.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2009
It is not uncommon for computer users to work on several things at once. However, to the computer... more It is not uncommon for computer users to work on several things at once. However, to the computer, all documents, emails and applications are considered equal, regardless of why they were created or used. Little support is provided when trying to recall important information about a particular project or subject at a later time. What is more, there is no effective way to help users review their past activities to identify when a particular subject was of importance, what were their concerns at a given moment in the past, or simply review their activities during a period of time at a glance. In this paper we describe PersonalNews, a system in which users are presented with a personal newspaper, in which the news articles describe the subjects they were concerned with in a given period of time. Those articles are automatically generated from the users' documents, grouped according to their subject and analyzed for relevant passages describing them. We show that PersonalNews is able to recognize the subjects and projects the users were involved in, and even help them recall some they had forgotten about. Also, it can be used effectively to help retrieve documents on particular subjects, even when the usual hints of filename and location in the filesystem.
Proceedings of the working conference on Advanced visual interfaces, 2008
With the growing popularity of digital cameras, the organization, browsing, management and groupi... more With the growing popularity of digital cameras, the organization, browsing, management and grouping of photos become a problem of every photograph (professional or amateur), because their collections easily achieve the order of thousands. Here, we present a system to automate these processes, which relies on photo information, such as, semantic features (extracted from content), meta-information and low level.
Proceedings of the 2nd Workshop on Context-awareness in Retrieval and Recommendation, 2012
The large amount of information spread out among applications raised several challenges when tryi... more The large amount of information spread out among applications raised several challenges when trying to retrieve it, as information useful in the past is potentially useful in the future. Most recommender systems resort to contextual information to provide single-source document suggestions, disregarding the manifold Personal Information (PI) sources. We believe that PI can provide a richer background of the user's interests, providing personally-relevant and user-centered suggestions. In this paper, we describe an extensible framework that makes use of both contextual and personal information to provide recommendations that are relevant to the user and the task at hand, instead of only the latter. Herein we also present a preliminary evaluation of our framework still mostly based on contextual information. This pilot study presented satisfying results disambiguating contexts, suggesting web and personal documents and dealing with context changes, paving the way to its enrichment with more PI sources.
Lecture Notes in Computer Science, 2012
Conversational agents have been subject of extensive research. An increasingly wider number of su... more Conversational agents have been subject of extensive research. An increasingly wider number of such agents simulate affective behavior in order to convey familiarity and increase believability. Nevertheless, the evolution of social relationships among people occurs gradually and the degree of intimacy associated with such relationships regulates people's behaviors. Similarly, we must take into account the progressive growth of relationships when modeling user-agent interaction. In this paper we present a model that regulates the development of user-agent relationships, articulating the Social Penetration Theory with personality modeling. User tests showed that gradual relationship building achieved through the implementation of our model makes an agent more interesting, while increasing its believability, engagement and fun.
Proceedings of the 30th European Conference on Cognitive Ergonomics, 2012
Proceedings of the 9th international conference on Intelligent user interfaces, 2004
Never before have so many information sources been available. Most are accessible on-line and som... more Never before have so many information sources been available. Most are accessible on-line and some exist on the Internet alone. However, this large information quantity makes interesting articles hard to find. Modern Personal Digital Assistants (PDAs), mobile phones, and the advent of ubiquitous computing will further complicate matters. Away from the desktop, the time to select important articles might be even harder to find. Strategies to select relevant information are sorely needed. One such strategy is content-based filtering, coupled with User Profiles. Our prototype uses a Bayesian classifier to select articles of interest to a specific user, according to his profile. The articles are extracted from web pages and displayed in a zoomable interface-based browser on a PDA. Interests may change over time, making it important to keep the profile up to date. The system monitors the users' reading behaviors, from which it infers their interest in particular articles and updates the profile accordingly. Results show that, from the start, most articles are correctly classified. An initial profile opposite to the user's actual interests can be reversed in less than ten days, showing the robustness of our approach. A user's interest in an article is inferred with a high degree of accuracy (over 90%).
Proceedings of the 28th Annual European Conference on Cognitive Ergonomics, 2010
Motivation-To understand the individual differences with the greatest impact on a blind user's mo... more Motivation-To understand the individual differences with the greatest impact on a blind user's mobile interaction effectiveness and learning abilities. Research approach-We performed a semi-structured interview to 10 specialized professionals (psychologists, occupational therapists, rehabilitation technicians, IT teacher) working closely with blind users. Findings/Design-Results suggest that peripheral sensitivity, spatial ability, blindness onset age, age, intelligence and memory are the characteristics affecting user capabilities the most. Research limitations/Implications-This study offers a wide view on the possible influencing attributes. Empirical studies are required to dissect the impact of each characteristic in mobile blind users' performance. Originality/Value-We contribute with an understanding of the individual differences among the blind population that may affect mobile interaction. Take away message-Individual differences among the blind have greater impact than those between sighted users. Understanding these differences is mandatory.
Proceedings of the International Working Conference on Advanced Visual Interfaces, 2012
Over the past years, music listening histories have become easily accessible due to the expansion... more Over the past years, music listening histories have become easily accessible due to the expansion of online lifelogging services. These histories represent the sequence of songs listen by users over time. Although this data contains intrinsic users' tastes and listening behaviors, it has been mainly used to personalize recommendations. Tools to help users exploring and reasoning about the information contained in the listening history, only recently have started to emerge. In this paper we describe a new visualization and exploration tool that allows users to interactively browse their listening histories, while leading them to identify listening trends and habits. Our solution combines a rich-featured timeline-based visualization, a set of synchronized-views and an interactive filtering mechanism to provide a flexible, effective and easy to use system for the analysis and knowledge exploration of listening histories. This was complemented with brushing and highlighting techniques to uncover listening trends about artists, albums and songs. Experimental evaluation with users revealed that they were able to complete all the requested tasks with a low error rate, and that they found the solution flexible and easy to use. Additionally, users were able to infer about their main life events and listening changes, which indicates that our combination of visualization techniques is effective in conveying relevant information about the listening habits.
CHI '04 Extended Abstracts on Human Factors in Computing Systems, 2004
The documents users must handle are growing both in number and diversity. However, the ways of or... more The documents users must handle are growing both in number and diversity. However, the ways of organizing and retrieving them remain largely unchanged. Given the innate human ability to tell stories, the use of narratives can be a natural and effective way to retrieve documents. To better understand how narratives can be used in this context, a thorough characterization of their contents and structure was obtained from several interviews. Then, the results were validated by the evaluation of low fidelity prototypes for story-capture interfaces, allowing us to verify that stories are valid as document-retrieval tools, and the shape those interfaces should take (structured text entry).
The proceedings of the 13th international ACM SIGACCESS conference on Computers and accessibility, 2011
The emergence of touch-based mobile devices brought fresh and exciting possibilities. These came ... more The emergence of touch-based mobile devices brought fresh and exciting possibilities. These came at the cost of a considerable number of novel challenges. They are particularly apparent with the blind population, as these devices lack tactile cues and are extremely visually demanding. Existing solutions resort to assistive screen reading software to compensate the lack of sight, still not all the information reaches the blind user. Good spatial ability is still required to have notion of the device and its interface, as well as the need to memorize buttons" position on screen. These abilities, as many other individual attributes as age, age of blindness onset or tactile sensibility are often forgotten, as the blind population is presented with the same methods ignoring capabilities and needs. Herein, we present a study with 13 blind people consisting of a touch screen text-entry task with four different methods. Results show that different capability levels have significant impact on performance and that this impact is related with the different methods" demands. These variances acknowledge the need of accounting for individual characteristics and giving space for difference, towards inclusive design.
Mobile devices have become faithful companions that keep track of most of our daily interactions ... more Mobile devices have become faithful companions that keep track of most of our daily interactions and are always available to interact with. However, considering their capabilities, mobile devices play an insufficient role helping the user in his common daily tasks. The information they have access to is limited, as is the context in which it can be used. We present GeniusPhone, a system that inter-relates the users' personal information and interactions with others from their computers and mobile devices, using it to gather ...
The increase of multimedia information over the past few years has led to the creation of mechani... more The increase of multimedia information over the past few years has led to the creation of mechanisms that enable its organization through descriptions or keywords. A popular way of associating such descriptions to content is tagging. It can be found in popular sites such as Flickr (for images) or Delicious (bookmarks), among many others. The user is free to associate several tags to content, richly describing that content, which may lead to an easier retrieval at a later time. This solves several problems with hierarchical organization ...
There is no such thing as an ultimate text-entry method. People are diverse and mobile touch typi... more There is no such thing as an ultimate text-entry method. People are diverse and mobile touch typing takes place in many different places and scenarios. This translates to a wide and dynamic diversity of abilities. Conversely, different methods present different demands and are adequate to different people/situations. In this paper we focus our attention on blind and situationally blind people; how abilities differ between people and situations, and how we can cope with those differences either by varying or adapting ...
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Papers by Daniel Gonçalves