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Fast distributed computation of distances in networks
Almeida, Paulo Sérgio; Baquero, Carlos; Cunha, AlcinoComunicação publicada em "IEEE Conference on Decision & Control (CDC)", pag. 5215-5220 ; This paper presents a distributed algorithm to simultaneously compute the diameter, radius and node eccentricity in all nodes of a synchronous network. Such topological information may be useful as input to configure other algorithms. Previous approaches have been modular, progressing in sequential phases using building bl...
Exploração de paralelismo em linguagens orientadas por objectos
Almeida, Paulo Sérgio Soares deDissertação apresentada para obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores, na Faculdade de Engenharia da Universidade do Porto, sob a orientação dos Professores Doutores Francisco Coelho Soares de Moura e Raul Fernando de Almeida Moreira Vidal
Fault-tolerant aggregation : flow-updating meets mass-distribution
Almeida, Paulo Sérgio; Baquero, Carlos; Farach-Colton, Martin; Jesus, Paulo; Mosteiro, Miguel A.The authors appear in alphabetical order. ; Flow-Updating (FU) is a fault-tolerant technique that has proved to be efficient in practice for the distributed computation of aggregate functions in communication networks where individual processors do not have access to global information. Previous distributed aggregation protocols, based on repeated sharing of input values (or mass) among processors, sometimes c...
Matéria orgânica em quatro tipos de solos brasileiros: composição química e sor...
Dick,Deborah Pinheiro; Martinazzo,Rosane; Knicker,Heike; Almeida,Paulo Sergio GoisSoil organic matter is the main sorptive soil compartment for atrazine in soils, followed in a minor scale by the inorganic fraction. In this study, the soil organic matter quality and atrazine sorption were investigated in four different soil types. The pedogenic environment affected the humification and therefore the chemical composition of the organic matter. The organic matter contribution to atrazine sorpt...
Probabilistic estimation of network size and diameter
Cardoso, Jorge C. S.; Baquero, Carlos; Almeida, Paulo SérgioDetermining the size of a network and its diameter are important functions in distributed systems, as there are a number of algorithms which rely on such parameters, or at least on estimates of those values. The Extrema Propagation technique allows the estimation of the size of a network in a fast, distributed and fault tolerant manner. The technique was previously studied in a simulation setting where rounds a...
Artificial intelligence tools for student learning assessment in professional s...
Almeida, Paulo Sérgio; Novais, Paulo; Costa, Eduardo; Rodrigues, Manuel; Neves, JoséThe necessity to maximize the learning success of the students as well as to produce professionals with the right skills to fulfil the market requirements, raises the question of closely following and assessing the learning paths of the students of Professional Schools. To solve at once problems and difficulties that arise during the learning process, we need to develop technologies and tools that allow the mon...
Prediction tools for student learning assessment in professional schools
Almeida, Paulo Sérgio; Novais, Paulo; Neves, JoséProfessional Schools are in need to access technologies and tools that allow the monitoring of a student evolution course, in acquiring a given skill. Furthermore, they need to be able to predict the presentation of the students on a course before they actually sign up, to either provide them with the extra skills required to succeed, or to adapt the course to the students’ level of knowledge. Based on a knowle...
Scalable bloom filters
Baquero, Carlos; Almeida, Paulo Sérgio; Preguiça, NunoBloom filters provide space-efficient storage of sets at the cost of a probability of false positives on membership queries. The size of the filter must be defined a priori based on the number of elements to store and the desired false positive probability, being impossible to store extra elements without increasing the false positive probability. This leads typically to a conservative assumption regarding maxi...
FEW : File Management for Portable Devices
Preguiça, Nuno; Baquero, Carlos; Martins, José Legatheaux; Shapiro, Marc; Almeida, Paulo Sérgio; Domingos, Henrique João Lopes; Fonte, VictorComunicação apresentada ao International Workshop on Software Support for Portable Storage (IWSSPS), San Francisco, 2005. ; In recent years, an increasing number of portable devices with large amounts of storage have become widely used. In this paper, we present the early design of the FEW system, a system that aims to ease file management in the new mobile environment. To this end, the system will manage fil...
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