Proceedings of the 19th Brazilian Symposium on Human Factors in Computing Systems, 2020
Visual content is strongly present in online social media. To ensure the accessibility of these c... more Visual content is strongly present in online social media. To ensure the accessibility of these contents to screen reader users, it is necessary to provide alternatives. In this paper, we report an initial investigation about the practices of visual content description in Brazilian online social media by examining the interfaces of the four most used in the country (YouTube, Facebook, WhatsApp, and Instagram) and surveying the description habits adopted by sighted users and the difficulties faced by screen readers users in understanding visual content. For this purpose, we conducted online surveys with sighted and visually impaired social media users. The results showed, among other aspects, that most sighted users do not describe visual content and even those that describe it, have difficulties to create the alternatives, mainly because they don't know what should be included or how to elaborate them. Moreover, for screen reader users, the greatest difficulty is the lack of alt...
This work presents a new study on characterization of EEG signal descriptors with possibility of ... more This work presents a new study on characterization of EEG signal descriptors with possibility of use in mobile devices for prevention of heart attack. Various techniques are compared in order to design a system for identification of normal or abnormal windows in a continuous scanning acquisition. As result the potentialities of the considered signal descriptors on the identification of normal or abnormal cardiac rhythms are discussed.
Proceedings of the 14th Brazilian Symposium on Human Factors in Computing Systems, 2015
The growth of the elderly population and the social network's benefits to this public makes e... more The growth of the elderly population and the social network's benefits to this public makes essential a good communicability of these systems for the elderly users. This article describes a qualitative research using the Communicability Evaluation Method for Collaborative Systems with two user's profiles on Facebook. The objective was to evaluate if the limitations from the aging process can generate different results in the contrasted profiles. As a result, we observed some aspects to be reviewed on Facebook interface as: improving meaning system, defining more clearly organization criteria for information and correcting usability and accessibility issues that contribute to communicability breakdowns during the elderly's interaction.
Proceedings of the 19th Brazilian Symposium on Human Factors in Computing Systems, 2020
Visual content is strongly present in online social media. To ensure the accessibility of these c... more Visual content is strongly present in online social media. To ensure the accessibility of these contents to screen reader users, it is necessary to provide alternatives. In this paper, we report an initial investigation about the practices of visual content description in Brazilian online social media by examining the interfaces of the four most used in the country (YouTube, Facebook, WhatsApp, and Instagram) and surveying the description habits adopted by sighted users and the difficulties faced by screen readers users in understanding visual content. For this purpose, we conducted online surveys with sighted and visually impaired social media users. The results showed, among other aspects, that most sighted users do not describe visual content and even those that describe it, have difficulties to create the alternatives, mainly because they don't know what should be included or how to elaborate them. Moreover, for screen reader users, the greatest difficulty is the lack of alt...
This work presents a new study on characterization of EEG signal descriptors with possibility of ... more This work presents a new study on characterization of EEG signal descriptors with possibility of use in mobile devices for prevention of heart attack. Various techniques are compared in order to design a system for identification of normal or abnormal windows in a continuous scanning acquisition. As result the potentialities of the considered signal descriptors on the identification of normal or abnormal cardiac rhythms are discussed.
Proceedings of the 14th Brazilian Symposium on Human Factors in Computing Systems, 2015
The growth of the elderly population and the social network's benefits to this public makes e... more The growth of the elderly population and the social network's benefits to this public makes essential a good communicability of these systems for the elderly users. This article describes a qualitative research using the Communicability Evaluation Method for Collaborative Systems with two user's profiles on Facebook. The objective was to evaluate if the limitations from the aging process can generate different results in the contrasted profiles. As a result, we observed some aspects to be reviewed on Facebook interface as: improving meaning system, defining more clearly organization criteria for information and correcting usability and accessibility issues that contribute to communicability breakdowns during the elderly's interaction.
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Papers by Leonardo Nardi