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Publicações

1990

Computer analysis and topographic spreading of epileptiform events

Autores
Martins da Silva, A; Morgado, R; Cunha, JP; Oliveira e Silva, T; Guedes de Oliveira, P; Vaz, F;

Publicação
Bollettino - Lega Italiana contro l'Epilessia

Abstract
The usefulness of computer analysis of EEG is exemplified here by using it as an instrument for fine measurement of the EEG epileptiform events. By using a PC-AT compatible microcomputer and a software package developed to record, analyse and display EEG signals, topograms and brain maps of epileptiform events are drawn. The characterisation of events in the scalp near potential epileptic focus and on the neighbouring areas is done. Studies of the origin and spreading of these epileptiform events over the location (EEG foci changing) can be correlated, with the clinical characteristics and evolution of focal epilepsy.

1990

FUZZY CLASSIFICATION FOR ONLINE TRANSIENT STABILITY ASSESSMENT OF ELECTRIC-POWER SYSTEMS

Autores
MATOS, MA; LOPES, JAP; BARBOSA, FPM;

Publicação
PROCEEDINGS OF THE TENTH POWER SYSTEMS COMPUTATION CONFERENCE

Abstract

1990

FUZZY LOAD FLOW - NEW ALGORITHMS INCORPORATING UNCERTAIN GENERATION AND LOAD REPRESENTATION

Autores
MIRANDA, V; MATOS, MACC; SARAIVA, JT;

Publicação
PROCEEDINGS OF THE TENTH POWER SYSTEMS COMPUTATION CONFERENCE

Abstract

1990

Interactive Ray-Tracing for Image production with Increasing Realism

Autores
de Sousa, AA; Costa, AMC; Ferreira, FN;

Publicação
11th European Computer Graphics Conference and Exhibition, Eurographics 1990, Montreux, Switzerland, September 4-7, 1990, Proceedings

Abstract

1989

An External Database for Prolog

Autores
Leal, JP;

Publicação
EPIA 89, 4th Portuguese Conference on Artificial Intelligence, Lisbon, Portugal, September 26-29, 1989, Proceedings

Abstract
This work describes a disk-resident database for Prolog which uses mechanisms similar to the ones used by the clausal database for recording and retrieving terms. It is intended to be used by applications requiring a flexibility greater than that provided by an interface to traditional database system. There is almost no restriction on the terms stored in the database and the retrieval mechanisms produces terms in the order they were recorded. To enhance the performance of the system, the database organization provides an access mechanism using hash-codes on ”key” arguments of the recorded term. The database also provides basic support for multi-user access. © Springer-Verlag Berlin Heidelberg 1989.

1989

Travelling waves methods for the calculation of electrical transients - An efficient computational algorithm of Bewley's method

Autores
Moura, AM; Barbosa, FM; Vale, Z;

Publicação

Abstract
The versatility of Bewley's method for the calculation of transient currents and voltages using personal computers is shown. The computer time and storage required are relatively small. SOBBE program is shown to be an efficient program for the study of transient phenomena of medium-size power system networks. Numerical results are presented.

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