Electronica E Telecomunicaçoes

Resumo A combinação de voz sintetizada com agentes animados, completos ou representados pela cara apenas, tem muitas aplicações, inclusive nas Telecomunicações. Tendo por objectivo contribuir para a existência desta tecnologia para a nossa língua, este artigo apresenta o desenvolvimento dosblocos necessários para uma" cara falante" para o Português. O trabalho incidiu na adaptação de um sistema, o RUTH, o desenvolvimento de uma voz rudimentar para para o Português utilizável no sistema de síntese de voz ...

Resumo Este é o primeiro de dois artigos que discutem a implementação de emissores/receptores para redes locais não cabladas utilizando a tecnologia de infravermelhos, de baixo custo. O trabalho aqui apresentado cobre maioritariamente os elementos da camada física. As redes locais não cabladas consideradas têm taxas de transmissão entre 4Mbps e 25Mbps, ea capacidade dofotodíodo receptor entre 10pF e 50pF. Os tipos de modulaçãoconsiderados são tipicamente 4-PPM ou 16-PPM. Neste ...

This paper describes an application developed for Windows platforms, which is meant to be used for inputting data and visualizing results of a Location-Routing problem of obnoxious services and materials. The main goal of this application is to provide, through a “usable” user interface, an intuitive of inputting the information needed to solve the problem as well as to visualize and analyze the results. This paper also describes the techniques used both for designing the dialog and for information visualization.

Resumo O artigo discute a implementação de um sistema de transmissão para fibra óptica, suportando taxas de transmissão de 622Mb/s (OC-12). O circuito desenvolvido em tecnologia CMOS de 1.0μm (ES2) implementa as necessárias conversões série/paralelo e paralelo/série. Este ASIC desenhado em Full-Custom é particularmente apropriado para aplicações baseadas em SONET/SDH (STM-4).

Today's workflows are commonly defined beyond organization boudaries and workflow management systems evolution tends to accommodate this recent trend. This type of workflows, implies data exchange between organizations and systems. Various specifications have been proposed to interchange workflow data such as Business Process Execution Language for Web Services (BPEL4WS) and Exchangeable Routing Language (XRL). In this context, this paper presents the state of the art of inter-organizational workflows and the main trends in tecnologies that support them.

Ciber-Feup autonomous agente was built with the main objective of using Ciber-Rato simulator for teaching Artificial Intelligence and Inteligent Robotics. The agent was built in the University of Porto as a successor of Micro-Pessoa agent, developed previously in University Fernando Pessoa. In Ciber-Rato 2002 competition, this agent attained second place in the finals and first place in the eliminatory rounds. This paper describes Ciber-FEUP architecture and main features. It also analyses some benefits and dangers of robotic competitions and points out future research area using the Ciber-Rato simulator as the main test bench.

This thesis presents the ATM principles in terms of supporting technologies and protocols. A set of experimental cases where ATM was used as supporting technology is also presented. The work carried out during the course of this Master Degree was divided in two parts. One carried out in Aveiro and the other at ASCOM Tech laboratories in Switzerland (March to December 1995). The events and trials described are divided in two main groups. The first group describes international events, in particular the Summer Schools on Advanced Broadband Communications 95 and 96 (ABC'95 and ABC'96) and other events sponsored by the European Community RACE and ACTS programs. The second group describes the author experience on the implementation and installation of two ATM networks in Aveiro. One of these networks is an ATM local area network that is currently being installed as an extension of the University of Aveiro Broadband Optical Network (ROBL). The other ATM network being installed in ...

* Trabalho financiado com a bolsa da FCT-PRAXIS XXI/BD/21353/99 Resumo - Os algoritmos evolutivos (AE) revelaram-se uma abordagem efectiva no encontro de soluções sub-óptimas para os problemas de optimização combinatória. Este artigo analiza a possibilidade de aceleração de AE para o caso do problema do caixeiro viajante (TSP) com a ajuda de hardware reconfigurável. Os resultados estimativos mostram que a combinação dum computador de uso geral e dos recursos duma FPGA permite incrementar significativamente o desempenho. Abstract - Evolutionary algorithms (EA) have been shown to be an effective approach for finding near-optimum solutions to problems of combinatorial optimization. The paper analyzes a possibility of acceleration of EA for the traveling salesman problem (TSP) with the aid of reconfigurable hardware. The estimative results show that the combination of general-purpose computer and FPGA resources allows performance to be increased significantly.