Repositório RCAAP

A new methodology to compute the pulmonary artery blood velocity using first pass scintigraphic images is presented. This project final goal, is the establishment of one correlation between pulmonary artery blood velocity and Pulmonary Hiperpressure. After a short approach about this pathology and the first pass images, the developed methodology is presented, as well the results obtained with one physical model and one real exam.

This paper introduces a new method for visualizationof voxel represented data based on oblique projections. Instead of the traditional approach in which objects are rotatedand then orthogonally projected, we investigated the possibilityof using oblique projections to view an object under multipledifferent viewing positions with a speed advantage. Weprove that oblique projections will lead to the same surfacethat is rendered when an object is rotated in 3-D space aboutZ- and X- axes followed by orthogonal projection. Moroever,when desired, the oblique distortion of the surface can be removed by a geometrical transformation of the final image. We will indicate how we can determine and exploit specific oblique projections with the property of mapping vertices of voxels exclusively on discrete coordinates in order to obtain very accurate rendering of surfaces.

This paper describes the development of a highlevel integrated environment for PCs with graphicsprogramming support. The development was carried out on the WindowsTM environment, with C++ language and multimedia tools. The result of this development was the creation of a graphic objects class with static and dynamic features and a graphic editor with graphic animation support (“MoveIt v1.0”).

VICAID (Vocational Integration through Computer Assistance for Intellectually Disabled People) is a project within the TIDE programme (Technology Initiative for Disabled and Elderly People) that aims to develop and evaluate a palmtop based system to support people with severe intellectual disabilities to perform complex work routines in integrated work settings. The development of the system will be based in a reference model, which should consider the interrelationships between human factors and technical constraints and possibilities. This paper presents and analyses the set of requirements that is being used for the definition of the reference model.

A generic program which uses ISDN is confronted with an API that implements the OSI layer lower protocols only. This paper describes a Windows 3.1x class library, that implements the high level services usually required in final applications, such as file and memory block transfer. A special attention was taken concerning the aspects related to the interface between this library and the client application, using mainly the event-method strategie, made easy by using C++ programming language, namely inheritance and virtual functions.Performance and flexibility were another focused aspects,as well as multitasking and background operation aspects.

Este trabalho visa a descrição de um método de projecto de malhas de adaptação para amplificadores de banda larga, que conduzam a um ganho de transdução constante numa banda previamente definida.

This paper presents an overview of the most common networks used in Home Systems, Power Line and CATV (Collective Antenna Television). The main characteristics and rules for communicating in these networks are shown here. The development of a CATV modem is described. This modem will be used to perform the link between the flats and the manager of information of the building.

This paper presents the design flow and the resulted experience in the development of a neural processor, using Verilog HDL. Describing the design steps toward the final system's description and simulationenvironment, provides a concrete illustration of the application of Verilog HDL features in the system's design testing, characterization and improvement, at the early stages of the project. The end-use neural computer's configuration comprises the Verilog HDL simulation environment as a fundamental tool for future neural software test and development.

This paper presents a user interface for a Decision Support System on Covering Problems (Set and Multiple)using multicriteria models. Since this system must be interactive and easy to use and learn, its interface wasdeveloped on a Windows platform, using Visual BasicTM 3.0.

This article describes the objectives and strategies of this project, that is co-funded by JNICT/CNEFF. Themain purpose of this project is the feasibility study of the application in the remote detection of forest fires of a telesurveillance system previously developed for security applications. The project includes the setup of a laboratory demonstrator that will support the validation of the results of the studies.This paper describes the most significative aspects of the system and presents a set of results already achieved.

This paper describes a model that enables the development of distributed applications and provides an interface for a transparent integration of standalone packages. This model is presented in the context of a Network Management System scenario.

This paper describes the development of applications for domotic systems using object oriented programming in C++, made as a final project of Electronic Engineering graduation . During this work, was developed a communications system to link the apartments and make management of information on the building, using CATV network. The software that supports the communications and performs the management of information was done using object oriented programming for Windows with Borland C++ 4.02.

Revista do departamento de Electrónica e Telecomunicações da Universidade de Aveiro.

This paper is about using user interface principles in lhe development of Picture Archiving and Communication Sistems. A PACS user interface project is described, and a prototype developed using Microsoft Visual BasicTM is presented.

In this paper, we describe an object oriented representation that is useful for the programmable implementation of artificial neural networks. This representation is basically composed of severa1 base objects which achieve, every one of them, a different leve1 of representation. The main idea is based on a bottom-uprepresentation, where we implement objects that get moreand more global, containing other objects of an immediatelower hierarchical position. With all this, it is expected toachieve an incremental global representation which is easy tounderstand, imagine and program. We describe a globalneural system model, focusing the three essentialcharacteristics: topology, recall and train.

A 100% analog neuron, implementable in CMOS1.2pm technology, was designed and simulated. The neuronconsists of simple current processing circuits, right from thesynapses' inputs to the axon's output. Only the weight inputis in voltage form, to achieve the fastest possible response. The neuron has an adaptive firing threshold, as well as anautonomous, local, non-supervised learning circuit.

This paper discusses the basic approaches involved in the use Object-Oriented Programming (OOP) and Object-Oriented Design (OOD) for application development. It emphasises the principal distinctions between two widely-used and well-known directions insoftware development. At present there are many computerlanguages that incorporate OOP capabilities. One of the most powerful of these languages is C++. This article underlines the main innovation introduced in C++. It recommends some rules for writing C++ object-oriented programs, and considers an animated software tutorial which allows the OOP approach in general, and C++ in particular, to be learned in the fastest possible way.

This paper deals with differential demodulation ofCPFSK signals with modulation index 1/2 (MSK) and 1. Making use of the signal complex envelopes, we show thatthe existence of discrete lines with adequate phase in themodulated signal, can be used in a differential demodulationoperation as a local reference. This has advantages whendemodulating signals with intersymbol interference (ISI). Ingeneral because of its non-linear nature the differentialdemodulator increases the output ISI, unless the signalcarries a component that can be used as a reference. Thisanalysis allows us to understand the reasons of thesuperiority of the modulation index 1 relatively to MSKwhen demodulating through a delay and multiply structuretightly filtered versions of these signals.

In this communication we report the design of a clock recovery circuit produced for the 20 Gbit/s demonstrator of the RACE 2011 project "TRAVEL" of the European Community. The clock recovery circuit is based on an open loop structure using a dielectric resonator narrow bandpass filter with high Q. A detailed electrical characterization of the circuit and alsoits sensitivity to temperature and detuning variations arepresented. The experimental results show that the circuit is avery attractive solution for the forthcoming STM-128 opticallinks.

In this tutorial paper we present a generalization of the transversal filter, called Laguerre filter, and study someof its more remarkable properties. This filter is obtained byreplacing each delay of the transversal filter by a first orderall-pass section, and by applying a first order low-pass filter(with the same pole used in the all-pass sections) to the filter’sinput signal. Both the transversal and the lattice forms of theLaguerre filter are discussed. We also deduce the stationarityconditions of the mean-square error of a Laguerre filter(transversal or lattice) with respect to its pole position.