Encontrados 8 documentos, a visualizar página 1 de 1
Computer Assisted Analysis of Left Ventricle Cineangiograms
Beatriz Sousa Santos; Pedro Guedes de OliveiraLeft Ventricle Cineangiography is an invasive procedure that produces images of Left Ventricle motion. The analysis of these images allows the evaluation of ventricular perjormance.A system was developed for the computer aided analysis of left ventricular cineangiograms, to help the cardiologist in routine clinical practice and research. This system is based on a IBM-AT compatible computer with image processing...
Multiprocessor and Real-Time Parallel Processing
António Nunes da Cruz; Pedro Guedes de OliveiraThe main subject of this thesis is a distributed, real-time processing system, which we have developed for application in the processing and classification of biological signals. As a matter of fact, one way to inrrease a system's processing power consists in the utilization of multiple processors sharing the workload among themselves; the management and coordination of shared resources becomes specially c...
High Performance Data Communication Switch for LAN interconnection
Nelson Rocha; Artur Pimenta Alves; Pedro Guedes de OliveiraLocal Area Networks are widely accepted and establish on the market. In order to search additional capabilities it is desirable the interconnection of the existing LANs, which can be done by a backbone network that spans distances of a broad site, like a university campus or an industrial site with multiple buildings. (...)keywords: local area networks; high speed local area networks; lan interconnection; ...
On the Kautz Filters and their Use in the Approximation on LinearTtime Invarian...
Tomás António Mendes Oliveira e Silva; Pedro Guedes de OliveiraLet H be the transfer function of a strictly stable, causal, and, linear system, and let h be its impulse response. If one does not assume a specific form for H, or, what is the same, a specific model for the system, the question arises as how to approximate that transfer function by another with a known form. (...)Keywords: Kautz filters; linear systems; approximation optimization; system identificat...
Background EEG activity of epileptic patients: search of relations between diff...
João Paulo Trigueiros da Silva Cunha; Pedro Guedes de OliveiraThe clinical classification of focal epileptic patients depends greatly on the fuci localization and is determinant to the correct choice of therapy. Consequently, the well-being of the patient is also dependent on the foci localization methodology used in each case. (...)Keywords: epilepsy; epilptogenic foci localization; background activity of th eeg; non linear association methods; multimedia informatio...
Analog Topologies for Gamma-Filters
Vitor Grade Tavares; Pedro Guedes de OliveiraFilters that belong to the class of "Generalized Feedfoward Filters" (GNFF), can he considered as models in-between FIR and IIR according to its complexity, stability and capacity. This dissertation is concerned in particular with issues related with analogue implementation of one of these GNFF, called the gamma filter. (...)Keywords: CMOS-VLSI; switch capacitors; mosfet-c; cmos active resistors, adaptive ...
As Primeiras Duas Décadas do DET e da UA: Uma Visão Pessoal
Pedro Guedes de Oliveira; Algures no princípio de 1974 (ou talvez mesmo nos finais de 73), deslocou-se ao LFEN1 o Vítor Gil, recém nomeado Reitor da nascente Universidade de Aveiro (UA), que vinha com indicações do Lopes Baptista para contactar algumas pessoas, com vista a uma eventual ida para a UA. O Baptista tinha trabalhado no LFEN durante uns anos – numa bre...
Voice Integration in a TCP/IP/Ethernet based LAN
Joaquim Azevedo; Joaquim Arnaldo Martins; Pedro Guedes de OliveiraThis work presents an experimental study on a personal computer based implementation of a 64 kbit/s voicecommunication system over the Ethernet local network.Voiceldata integration is achieved without resorting to anynew packet switching protocol and without any changes tothe CSMAICD protocol specifications. System performance isevaluated according to its average transmission delay andpercentage of packet ...
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