Publications

Publications by Pedro Guedes de Oliveira

1985

PSEUDO-STAR: A GEOGRAPHICALLY CENTRALIZED, LOGICALLY DISTRIBUTED LAN.

Authors
Alves Jorge, C; Guedes de Oliveira, P; Rocha Nelson, P;

Publication

Abstract
A local area network under development at DETUA is described. The network topology is geographically centralized, although access and control to the shared transmission medium is distributed. This results in a number of advantages when compared with conventional topologies.

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1987

A study on the best order for autoregressive EEG modelling

Authors
Vaz, F; de Oliveira, PG; Principe, J;

Publication
International Journal of Bio-Medical Computing

Abstract
The autoregressive (AR) model is a widely used tool in electroencephalogram (EEG) analysis. The dependence of the AR model on both the segment length and several characteristic EEG patterns is addressed. The best AR model order is computed with three different criteria. The results show that the Rissanen criteria provides the more consistent order estimate for the EEG patterns considered. This study shows that for our data set, a 5th order AR model represents adequately 1- or 2-s EEG segments with the exception of featureless background, where higher order models are necessary. © 1987.

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1987

EVENT ORIENTED ANALYSIS OF THE EEG: TIME DEPENDENCE AND TOPOGRAPHIC RELATIONS.

Authors
Guedes de Oliveira, P; Martins da Silva, A; Principe, JC; Vaz, F;

Publication
IEEE/Engineering in Medicine and Biology Society Annual Conference

Abstract
A strategy for automated EEG (electroencephalogram) analysis based on time-domain events is presented. It consists of a simple algorithm made of modules. The events are selected and characterized in a first step of analysis according to a hierarchical procedure and then put together to form clusters which may be considered more complex events. Finally, a special-purpose hardware built to map this strategy is briefly described.

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1987

HIDRA - A HIERARCHICAL INSTRUMENT FOR DISTRIBUTED REAL-TIME ANALYSIS OF BIOLOGICAL SIGNALS

Authors
DEOLIVEIRA, PG; PRINCIPE, JC; CRUZ, AN; TOME, AM;

Publication
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING

Abstract

1989

Impact of information technology on the classic environment: short- and long-term perspectives in Portugal and the European arena [O impacto das tecnologias de informação no ambiente clássico: perspectiva de curto e médio prazo em Portugal e no espaço Europeu.]

Authors
De Oliveira, PG; Leitao, JM;

Publication
Acta medica portuguesa

Abstract

1989

M-MODE ECHOCARDIOGRAPHY STUDY OF 22 TOP CLASS RACING CYCLISTS

Authors
SEPULVEDA, F; DEOLIVEIRA, E; DEOLIVEIRA, PG; DEMACEDO, E; MACIEL, L; COSTA, O; OLIVEIRA, A; DEFREITAS, F;

Publication
JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Abstract
In this study M-mode echocardiograms were performed on 22 top class racing cyclists in order to assess the incidence of structural heart alterations. A normal control group was composed of 20 sedentary men of similar age and surface body area. Statistical analysis was performed using the unpaired Student t-test. A normal LV mass was found in all athletes and normal left Ventricle diastolic diametre (LVDD) in 23 cyclists. Global and regional LV systolic functions were normal in all cyclists. Mitral valve analysis showed normal LV compliance in all athletes. Thus, the cyclists admitted to our study did not present LV hypertrophy and most of them had normal LVDD. Systolic and diastolic functions were normal in all of them.

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