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DSpace - Universidade do Porto (71,072 recursos)
Este repositório institucional visa coleccionar, preservar e disponibilizar na Internet a produção intelectual da comunidade académica da U.PORTO. Apenas as publicações em texto integral e de acesso livre (sob as condições de licença pública Creative Commons)fazem parte deste repositório. Informações adicionais sobre outras publicações encontram-se em www.up.pt.

FCUP - Artigo em Acta de Conferência Internacional

Mostrando recursos 1 - 20 de 25

1. Riscos tecnológicos: modelação e avaliação das consequências de um acidente no transporte rodoviário de cloro - Costa, Henrique; Trelles, Manuel; Gomes, António Alberto
O presente trabalho analisa um acidente tecnológico ocorrido durante o transporte rodoviário de uma cisterna com 21 toneladas de cloro (Cl2). Apesar de não ter ocorrido fuga da substância transportada, são avaliadas as potenciais consequências para a população e ambiente, caso a fuga de cloro tivesse ocorrido. Explana-se os softwares utilizados para a modelação da possível área atingida pela fuga, e ainda para determinar o número e as possíveis consequências fisiológicas da população presente das áreas afetadas.

2. #8216;DIY#8217; na Universidade do Porto : instrumentos científicos fabricados localmente - Marisa Monteiro; Luís Bernardo; José Araújo
In the late spring of 1942, a significant number of scientific instruments made inPorto#8217;s workshops was exhibited in the premises of the Physics Laboratory of the Faculty of Science, while the 4º Congresso Luso-Espanhol para o Progresso das Ciências was taking place. The entries in the small catalogue associated to this event amounted to 206. The instruments, apparatus and glassware listed were the result of an effort of several years, of the Physics Laboratory, as well as of other similar institutions to meet the needs of an appropriate experimental teaching. The Museum of Science of the University of Porto, which...

3. A pipelined data-parallel algorithm for ILP - fonseca, nuno a.; silva, fernando; costa, vitor santos; camacho, rui
The amount of data collected and stored in databases is growing considerably for almost all areas of human activity. Processing this amount of data is very expensive, both humanly and computationally. This justifies the increased interest both on the automatic discovery of useful knowledge from databases, and on using parallel processing for this task. Multi Relational Data Mining (MRDM) techniques, such as Inductive Logic Programming (ILP), can learn rules from relational databases consisting of multiple tables. However current ILP systems are designed to run in main memory and can have long running times. We propose a pipelined data-parallel algorithm for...

4. A pipelined data-parallel algorithm for ILP - fonseca, nuno a.; silva, fernando; costa, vitor santos; camacho, rui
The amount of data collected and stored in databases is growing considerably for almost all areas of human activity. Processing this amount of data is very expensive, both humanly and computationally. This justifies the increased interest both on the automatic discovery of useful knowledge from databases, and on using parallel processing for this task. Multi Relational Data Mining (MRDM) techniques, such as Inductive Logic Programming (ILP), can learn rules from relational databases consisting of multiple tables. However current ILP systems are designed to run in main memory and can have long running times. We propose a pipelined data-parallel algorithm for...

5. Dynamic simulation of human motion - nunes, jf; reis, lp; rossetti, rjf; moreira, pm; tavares, jmrs
In order to study the mechanisms behind the human motion and its disorders, and to comprehend how do neuromuscular impairments affect the human movements, it is crucial to know the human musculoskeletal system. This knowledge is also essential to effectively model and analyse the musculoskeletal system, and to classify the human movement. With this work we conducted preliminary studies over a musculoskeletal model in motion, and performed a comparative analysis in gait between two models: one with a non-pathological gait and another with a disordered gait.

6. Control of uncertain compartmental systems - sousa, c; mendonca, t; rocha, p
\ A study of the performance of mass control for compartmental systems, under the presence of uncertainties, is presented. Bounds for the asymptotical mass offset are derived as a functional of the uncertainty bounds. The obtained results are illustrated by simulations for the case of neuromuscular blockade control of patients undergoing surgery.

7. Total Mass TCI driven by Parametric Estimation - silva, mm; sousa, c; sebastiao, r; gama, j; mendonca, t; rocha, p; esteves, s
This paper presents the Total Mass Target Controlled Infusion algorithm. The system comprises an On Line tuned Algorithm for Recovery Detection (OLARD) after an initial bolus administration and a Bayesian identification method for parametric estimation based on sparse measurements of the accessible signal. To design the drug dosage profile, two algorithms are here proposed. During the transient phase, an Input Variance Control (IVC) algorithm is used. It is based on the concept of TCI and aims to steer the drug effect to a predefined target value within an a priori fixed interval of time. After the steady state phase is...

8. Quantification of the total suspended matter concentration in the sea breaking zone from in situ measurements and remotely sensed data - two empirical approaches - teodoro, ac; marcal, ars; veloso-gomes, f
Remote sensing techniques can be used to calculate suspended sediment concentrations and to understand the flux and distribution of sediments driven by mechanisms such as tides and waves, river discharges, etc. The main objective of this study is the quantification of the Total Suspended Matter (TSM) concentration in the sea breaking zone for a particular area of the Portuguese coast, around Aveiro. The methodology used was based on in situ measurements and multi spectral satellite images. In situ experimental techniques (maritime platform, aerial platform, simulation on the beach and water sample collection in the breaking zone) were used to determine...

9. k-RNN: k-Relational Nearest Neighbour Algorithm - fonseca, nuno a.; costa, vitor santos; rocha, ricardo; camacho, rui
The amount of data collected and stored in databases is growing considerably in almost all areas of human activity. In complex applications the data involves several relations and proposionalization is not a suitable approach. Multi-Relational Data Mining algorithms can analyze data from multiple relations, with no need to transform the data into a single table, but are computationally more expensive. In this paper a novel relational classification algorithm based on the k-nearest neighbour algorithm is presented and evaluated.

10. Computing card probabilities in Texas Holdem - teofilo, lf; reis, lp; cardoso, hl
Developing Poker agents that can compete at the level of a human expert can be a challenging endeavor, since agents strategies must be capable of dealing with hidden information, deception and risk management. A way of addressing this issue is to model opponents behavior in order to estimate their game plan and make decisions based on such estimations. In this paper, several hand evaluation and classification techniques are compared and conclusions on their respective applicability and scope are drawn. Also, we suggest improvements on current techniques through Monte Carlo sampling. The current methods to deal with risk management were found...

11. A PDF based digital signed document format for interoperable institutional structured data integrity - Luís A. Maia; Luís M. Valente; Manuel E. Correia; Lígia M. Ribeiro; Luís Antunes
It is widely recognized that information systems constitute a key tool for the overall performance improvement of administrative tasks in academic institutions. However at their genesis lies a latent promise of a paper-less environment that stays most of the time unfulfilled due to the lack of appropriate digital document integrity and accountability mechanisms. Academic institutions are thus most of the time still relying on traditional security trust methods based on paper documents for signing and archiving critical documents. While this method delivers an inefficient, inconvenient and costly workflow, it is still a common method to provide some sort of workable...

12. Time Dependent Clustering of Time Series - Joaquim Costa; Isabel Silva; M. Eduarda Silva
In this work we consider the problem of clustering time series. Contrary to other works on this topic, our main concern is to let the most important observations, for instance the most recent, have a larger weight on the analysis. This is done by defining similarities measures between two time series, based on Pearsons correlation coefficient, which uses the notion of weighted mean and weighted covariance, where the weights increase monotonically with the time. We use these measures, which are metrics between time series, as a similarity or dissimilarity index between the $n$ time series to be clustered. We apply...

13. Intercomparison between existing wet tropospheric corrections for coastal altimetry, - M. J. Fernandes; C. Lázaro; A. Nunes; N. Pires; M. Salgado; P. Cipollini

14. Evaluating MODIS vegetation indices using ground based measurements in a mountains semi-natural meadows of northeast Portugal - M. Cunha; I. Poças; A. Marçal; A. Rodrigues; L.S. Pereira

15. Validation of coastal altimetry data along the west Iberian coast - S.M. Barbosa; M. J. Fernandes; C. Lázaro; A.L. Nunes; N. Pires; P. Cipollini

16. Probabilistic surface change detection and measurement from digital aerial stereo images - A. Jalobeanu; C. Gama; J.A. Gonçalves
We propose a new method to measure changes in terrain topography from two optical stereo image pairs acquired at differentdates. The main novelty is in the ability of computing the spatial distribution of uncertainty, thanks to stochastic modeling andprobabilistic inference. Thus, scientists will have access to quantitative error estimates of local surface variation, so they cancheck the statistical significance of elevation changes, and make, where changes have occurred, consistent measurements ofvolume or shape evolution. The main application area is geomorphology, as the method can help study phenomena such ascoastal cliff erosion, sand dune displacement and various transport mechanisms through the...

17. The use of similarity images on multi-sensor automatic image registration - H. Gonçalves; J.A. Gonçalves; L. Corte-Real
Automatic image registration (AIR) is still a present challenge regarding remote sensing applications. Although several methodshave been proposed in the last few years, geometric correction is often a time and effort consuming manual task. The only AIRmethod which is commonly used is the correlation-based template matching method. It usually consists on considering a windowfrom one image and passing it throughout the other, looking for a maximum of correlation, which may be associated to thedisplacement between the two images. This approach leads sometimes (for example with multi-sensor image registration) to lowcorrelation coefficient values, which do not give sufficient confidence to associate...

18. Progress in coastal altimetry: outcomes of the COASTALT Project

19. A Comparative Study of Satellite andGround-Based Vineyard Phenology - Mário Cunha; André Marçal; Arlete Rodrigues

20. MONITORING OF BEACHES AND SAND DUNES USING DIGITAL AERIALPHOTOGRAPHY WITH DIRECT GEOREFERENCING - José Gonçalves; Maria Bastos; Bruno Martins; Américo Magalhães
Beaches in the Portuguese western coast suffer sudden changes due to the action of the sea during winter. Frequentacquisition of digital surface models (DSM) is needed in order to assess volumetric changes. This paper presents amonitoring program carried in an area of 15 km near the city of Porto. Digital aerial photography is acquired twicea year, using a Zeiss-Intergraph DMC camera, with a spatial resolution of 10 cm, by a local company. Images areprovided with exterior orientation provided by direct georeferencing equipment. An assessment of the exteriororientation parameters provided was done using field survey points. It could be concluded that...

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