André Ferreira

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We present in this paper a study of three EEG signals feature extraction techniques. These techniques have been widely employed in researches of emotional states recognition: statistical characteristics, features based on PSD (Power Spectral Density) and features based on HOC (High Order Crossings). The validation was performed via classification of(More)
Identification of novel antigens is essential for developing new diagnostic tests and vaccines. We used DIGE to compare protein expression in amastigote and promastigote forms of Leishmania chagasi. Nine hundred amastigote and promastigote spots were visualized. Five amastigote-specific, 25 promastigote-specific, and 10 proteins shared by the two parasite(More)
Evidence based on immunological cross-reactivity and anti-diabetic properties has suggested the presence of insulin-like peptides in plants. The objective of the present study was to investigate the presence of insulin-like proteins in the leaves of Bauhinia variegata ("pata-de-vaca", "mororó"), a plant widely utilized in popular medicine as an(More)
Diplomacy is a military strategy turn-based board game, which takes place in the turn of the 20th century, where seven world powers fight for the dominion of Europe. The game can be played by 2 to 7 players and is characterized by not having random factors, as well as, by being a zero-sum game. It has a very important component when played by human players(More)
Two different Human-Machine Interfaces (HMIs) were developed, both based on electro-biological signals. One is based on the EMG signal and the other is based on the EEG signal. Two major features of such interfaces are their relatively simple data acquisition and processing systems, which need just a few hardware and software resources, so that they are,(More)
Volcano Salvation is an innovative computer game that combines two input modalities: hand gestures to lift, move, and manipulate objects, and head tracking to change perspective within the game world. The two input devices are a webcam and a Leap Motion controller. Volcano Salvation is an immersive strategy game that contributes to the field of game design(More)
This paper presents the evaluation of seven techniques of feature extraction (PSD, F-Test, EMD, MCE, CCA, LASSO and MSI) for gaze-target detections in a SSVEP-based BCI. Two type of technologies for visual stimulation were used (LCD and LEDs). Five differents windows lengths (1, 2, 4, 5 and 10 s) were used and seven volunteers participated in this study.(More)
Designing and implementing the interaction behavior for body tracking capable systems requires complex modeling of actions and extensive calibration. Being the most recent and successful device for robust interactive body tracking, Microsoft's Kinect has enabled natural interaction by the use of consumer hardware, providing detailed and powerful information(More)
Chagas' disease, caused by the protozoan Trypanosoma cruzi, is endemic in Latin America, which current treatment presents variable efficacy and serious side effects. A previous screening of naphthoquinone derivatives pointed to the naphthoimidazoles N1, N2 and N3 as the most active compounds against T. cruzi. In this study, a proteomic approach was employed(More)