V. Eyharabide - Academia.edu (original) (raw)

Papers by V. Eyharabide

Informática na educação: teoria & prática

A personalização em sistemas de e-learning é fundamental, uma vez que esses são utilizados por um... more A personalização em sistemas de e-learning é fundamental, uma vez que esses são utilizados por uma grande variedade de alunos, com características diferentes. Há várias abordagens que visam personalizar ambientes e- learning. No entanto, esses se concentram principalmen- te na tecnologia e / ou em detalhes da rede, sem levar em consideração os aspectos contextuais. Eles consideram apenas uma versão limitada do contexto, proporcionando personalização. Em nosso trabalho, o objetivo é melhorar a personalização do ambiente de aprendizagem e-learning, fazendo uso de uma melhor compreensão e modelagem do contexto educacional e tecnológico do usuário, utilizando ontologias. Mostramos um exemplo do uso da nossa pro- posta no sistema AdaptWeb, na qual o conteúdo e as re- comendações de navegação fornecidas dependem do con- texto do aluno.

International Journal of Synthetic Emotions, 2015

Advances in the use of virtual affective agents for therapeutic purposes in mental health opened ... more Advances in the use of virtual affective agents for therapeutic purposes in mental health opened a research avenue to improve the way patients interpret other's behavior as helpful instead of menacing. Here, the authors propose an original paradigm based on affective computing and virtual reality technologies requiring the assessment of helping intentions as well as self-monitoring metacognition. Sixteen healthy subjects played a 38-turns card games with a virtual affective agent (MARC) during which they had to guess between two cards the one that would be color-matched with another card. Their guesses could be oriented by the agent's emotional displays. Three subjective ratings on a percentage analog scale were recorded after each trial: helpfulness, self- monitoring, and sympathy. Help recognition and self-monitoring metacognitive ratings raise the question of the importance to enhance both components in therapeutic situations within psychiatric populations. Overall, this ...

2011 IEEE Workshop on Affective Computational Intelligence (WACI), 2011

Recent research suggests that predicting students' emotions during e-learning is quite relevant b... more Recent research suggests that predicting students' emotions during e-learning is quite relevant but should be situated in the learning context and consider the individual profile of users. More knowledge is required for assessing the possible contributions of multiple sources of information for predicting students' emotions. In this paper we describe an ontology that we have implemented for predicting students' emotions when interacting with a quiz about Java programming. An experimental study with 17 computer science students compares the automatic predictions made by the ontology with the emotions self-reported by students.

Technology Enhanced Support for Learners and Teachers, 2012

This chapter presents the context-aware aspects of ADAPTSUR, a personalization approach designed ... more This chapter presents the context-aware aspects of ADAPTSUR, a personalization approach designed for e-learning environments. The main features of ADAPTSUR are described and illustrated, showing how to use it to model context and culture for personalization in e-learning environments. The authors describe two materializations of the proposed approach, an adaptive e-learning system and an intelligent tutor, which provide personalized assistance to students taking into account their profiles. Finally, the authors discuss the benefits of their proposal.

INTELIGENCIA ARTIFICIAL, 2005

To give the user proper assistance, an interface agent should be able to predict the user's inten... more To give the user proper assistance, an interface agent should be able to predict the user's intentions. Usually, they achieve that through the use of a detailed task model for a particular application domain. However, to develop such knowledge representations is a difficult and time-consuming activity. Generally, it is tedious and annoying for the agent developers to express such knowledge manually. Also, the necessity to have an expert that offers information on the application domain is a problematic restriction. Therefore, this paper will focus on the automatic task model generation without previous knowledge on the application domain.

International Journal of Human-Computer Interaction, 2014

Several studies have investigated the relevance of haptics to convey various types of emotions ph... more Several studies have investigated the relevance of haptics to convey various types of emotions physically. This article investigates the improvement of the recognition rate of emotions using visuo-haptic feedback compared to facial and haptic expressions alone. Four experiments were conducted in which the recognition rates of emotions using facial, haptic and visuo-haptic expressions were tested. The first experiment evaluates the recognition rate of emotions using facial expressions. The second experiment collects a large corpus of 3D haptic expressions of certain emotions and subsequently identifies the relevant haptic expression for each emotion. The third experiment evaluates the selected haptic expressions through statistical and perceptive tests to retain the ones that result in the most accurate identification of the corresponding emotion. Finally, the fourth experiment studies the effect of visuo-haptic coupling on the recognition of the investigated emotions. Generally, emotions with high amplitudes of pleasure are better recognized in the visual modality. However, emotions with high activation are better recognized in the haptic modality. These results also highlighted the finding that participants are not equally aided by each modality when recognizing emotions efficiently. Beyond the recognition rate, multimodal expressions improved the sensation of presence and expressivity.

IFIP Advances in Information and Communication Technology, 2009

Personalization in e-learning systems is vital since they are used by a wide variety of students ... more Personalization in e-learning systems is vital since they are used by a wide variety of students with different characteristics. There are several approaches that aim at personalizing e-learning environments. However, they focus mainly on technological and/or networking aspects without caring of contextual aspects. They consider only a limited version of context while providing personalization. In our work, the objective is to improve e-learning environment personalization making use of a better understanding and modeling of the user's educational and technological context using ontologies. We show an example of the use of our proposal in the AdaptWeb system, in which content and navigation recommendations are provided depending on the student's context.

2013 Humaine Association Conference on Affective Computing and Intelligent Interaction, 2013

Databases of spontaneous multimodal expressions of affective states occurring during a task are f... more Databases of spontaneous multimodal expressions of affective states occurring during a task are few. This paper presents a protocol for eliciting stress in a public speaking task. Behaviors of 19 participants were recorded via a multimodal setup including speech, video of the facial expressions and body movements, balance via a force plate, and physiological measures. Questionnaires were used to assert emotional states, personality profiles and relevant coping behaviors to study how participants cope with stressful situations. Several subjective and objective performances were also evaluated. Results show a significant impact of the overall task and conditions on the participants' emotional activation. The possible future use of this new multimodal emotional corpus is described.

Applied Intelligence, 2012

... ment. The objective is to semantically enrich a user pro-file with contextual information by ... more ... ment. The objective is to semantically enrich a user pro-file with contextual information by using association rules, Bayesian networks and ontologies in order to improve agent performance. ... 19]. Step 2: Bayesian Net Creation ...

ACM Transactions on Applied Perception, 2013

ABSTRACT Several studies have investigated the relevance of haptics to physically convey various ... more ABSTRACT Several studies have investigated the relevance of haptics to physically convey various types of emotion. However, they use basic analysis approaches to identify the relevant features for an effective communication of emotion. This article presents an advanced analysis approach, based on the clustering technique, that enables the extraction of the general features of affective haptic expressions as well as the identification of specific features in order to discriminate between close emotions that are difficult to differentiate. This approach was tested in the context of affective communication through a virtual handshake. It uses a haptic device, which enables the expression of 3D movements. The results of this research were compared to those of the standard Analysis of Variance method in order to highlight the advantages and limitations of each approach.

One of the biggest problems that Internet faces is the increase of email spam. The main drawback ... more One of the biggest problems that Internet faces is the increase of email spam. The main drawback with previous anti-spam filters is that they are based only on 1) the syntactical features of words lacking semantic analysis or 2) on what the majority of users regard as spam without considering the individual preferences of a particular user. In this report we present a spam email filter which personalizes its filtering process using an email user profile that contains the user's preferences regarding emails. Our innovative email user profile is based not only on some common user profiling techniques but also enriched with the knowledge contained in a domain ontology. The user profile is used to learn which spam emails (although unsolicited and large- scale sent) are interesting for the user anyway. The encouraging experimental results provide empirical evidence for the effectiveness of using an ontological approach to user profiling in an email spam filter.

... 23. Peter G. Politakis, Empirical Analysis for Expert Systems, Morgan Kaufmann Publishers Inc... more ... 23. Peter G. Politakis, Empirical Analysis for Expert Systems, Morgan Kaufmann Publishers Inc., San Francisco, CA, 1998. 24. Shah, D., Lakshmanan, L., Ramamritham, K., & Sudarshan, S. (1999). Interestingness and Pruning of Mined Patterns. ...

Frontiers in Human Neuroscience, 2015

In recent decades, many studies have shown that schizophrenia is associated with severe social co... more In recent decades, many studies have shown that schizophrenia is associated with severe social cognitive impairments affecting key components, such as the recognition of emotions, theory of mind, attributional style, and metacognition. Most studies investigated each construct separately, precluding analysis of the interactive and immersive nature of real-life situation. Specialized batteries of tests are under investigation to assess social cognition, which is thought now as a link between neurocognitive disorders and impaired functioning. However, this link accounts for a limited part of the variance of real-life functioning. To fill this gap, advances in virtual reality and affective computing have made it possible to carry out experimental investigations of naturalistic social cognition, in controlled conditions, with good reproducibility. This approach is illustrated with the description of a new paradigm based on an original virtual card game in which subjects interpret emotional displays from a female virtual agent, and decipher her helping intentions. Independent variables concerning emotional expression in terms of valence and intensity were manipulated. We show how several useful dependant variables, ranging from classic experimental psychology data to metacognition or subjective experiences records, may be extracted from a single experiment. Methodological issues about the immersion into a simulated intersubjective situation are considered.The example of this new flexible experimental setting, with regards to the many constructs recognized in social neurosciences, constitutes a rationale for focusing on this potential intermediate link between standardized tests and real-life functioning, and also for using it as an innovative media for cognitive remediation.