Percorrer por autor "Santos, Rui"
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- Alternative heavy tailed models in seismologyPublication . Felgueiras, Miguel; Martins, João; Santos, RuiGreat earthquakes are commonly considered as the ones with moment magnitude (Mw ) above or equal to 8.0. Since these earthquakes can destroy entire communities located near the epicentre, the search of physical laws that explain the energy released by them is an important issue. There is a connection between the radiated energy of an earthquake, its magnitude and its seismic moment (M 0). Thence, when fitting a heavy or an extremely heavy tailed distribution to a seismic moment dataset, we are in fact adjusting a mathematical model which explains the amount of energy released by these great seisms. Therefore, the main goal of this work is to study the more appropriated Pareto based models (the most used family in this field) when explaining the seismic moment of the great earthquakes. With this purpose in mind, we selected two different catalogs that accommodate recent events and are considered more accurate than other catalogs used in previous works. We conclude that the traditional Pareto distribution remains a good choice to deal with this kind of data, but Log-Pareto lead to higher p-values and Location-scale Pareto is better fitted to the biggest events.
- Commingled and disarticulated human remains related to 1755 Lisbon earthquake: Height estimation from incomplete and complete femoral bonesPublication . Matos, Sofia; Flamino, Carolina Barroso; Borges, Guilherme; Francisco, Inês; Tropa, Madalena; Cruz, Tiago; Bento, Beatriz; Santos, Rui; Pereira, Cristiana PalmelaIntroduction: In Forensic Medicine, the estimation of the stature often has a crucial role in the reconstruction phase of disjointed populations. The femur, being the longest bone in the human body, is usually the most reliable source in height estimation. However, in these populations, intact femurs are hardly ever found, making it necessary to use femur fragments for the same purpose. Aim: This investigation aims to estimate the stature of the catastrophic population concerning the earthquake that occurred in Lisbon, in 1755. Materials and Methods: The study was conducted on 8 whole femurs and 21 fragments, which were measured and weighted. These measurements were applied in a regression formula, obtained from the gathered research, in order to estimate the stature of the population. Results: The results showed that, for the whole femur, the corresponding height varies between 147.96 cm and 168.82 cm. For the fragments, the obtained estimates vary between 151.96 cm and 174.96 cm. Conclusion: The methods used proved to be reliable in estimating the length of the femur, as well as in deducting the height of individuals through this bone, allowing the study of these parameter's evolution in generations.
- Discrete Compound Tests and Dorfman’s Methodology in the Presence of MisclassificationPublication . Santos, Rui; Martins, João Paulo; Felgueiras, MiguelCompound tests can be used to save resources for classification or estimation purposes in clinical trials and quality control. Nevertheless, the methodologies that are usually applied are restricted to qualitative group tests. Moreover, when quantitative compound tests are applied the problem is to ascertain whether the amount of some substance of any individual in the group is greater or lower than a prefixed threshold. An overview of the applications of the discrete compound tests highlights the advantages (to save resources) and disadvantages (higher probability of misclassification), and suggests criteria to assess the suitability of applying Dorfman’s methodology.
- Estimation Through Array-Based Group TestsPublication . Oliveira Martins, João Paulo; Felgueiras, Miguel; Santos, RuiPooling individual samples for batch testing is a common procedure for reducing costs. The recent use of multidimensional array algorithms, due to the emergence of robotic pooling, is an innovative way of pooling. We show that the two-dimensional array-based group tests can provide accurate estimates for the prevalence rate even for situations in which the traditional estimators, applied to one-dimensional arrays, are not valid. Hence, a computational script was developed to determine which prevalence rate estimate minimizes the sum of the squared deviations between the number of observed and expected rows and columns whose pooled sample had a positive test result. © 2017, National Statistical Institute. All rights reserved.
- Evaluation of an educational project for the development of the autonomy of life in young people leaving residential carePublication . Santos, Rui; Margarido, Cristóvão; Pocinho, Ricardo; Silva, Tânia; Póvoa, VanessaOne of the protection measures provided to at-risk children and young people in Portugal is residential care. Residential care facilities foster children and young people from unstructured families, providing them with conditions that may allow to enhance their full development, including their education, well-being and preparation for life autonomy. Projet' Ar-te is an intervention project developed at Casa do Canto, under the direction of the Portuguese Association for the Rights of Minors and the Family - CrescerSer, financed from 2012 to 2015 through the "Children and Youth at Risk"Program of Fundação Calouste Gulbenkian. The main objectives of this project were the creation of the Life Skills Development Program (PDCV) and the Support and Monitoring Structure (ESAAC) for the young people leaving residential care, in order to provide them with a close affective rear, helping to face the challenges and difficulties they encounter successively outside the residential care facility. Through ethnobiographic interviews with two young women experiencing the project for one year, the aim was to understand their perceptions regarding two moments: the residential care period and the experiences after leaving Casa do Canto through the support provided by the ESAAC Structure. The results showed that participation in the project activities provided significant moments during residential care, which seem to have an important impact on the autonomy strategies adopted by young women after leaving the facility.
- Exploring Pareto scale mixturesPublication . Felgueiras, Miguel; Santos, RuiPareto scale mixtures can be used to obtain distributions with heavier tails. An explanation of this model properties is provided, together with a discussion about the parameters estimation. Finally, a real data application is presented, consisting in the larger earthquakes seismic moment modeling.
- IntroduçãoPublication . Vieira, Ricardo; Pérez de Guzmán Puya, María Victoria; Marques, José Carlos Laranjo; Silva, Pedro; Vieira, Ana Maria de Sousa Neves; Margarido, Cristóvão; Matos, Rui; Santos, Rui
- IntroduçãoPublication . Vieira, Ricardo; Marques, José Carlos; Silva, Pedro; Vieira, Ana Maria; Margarido, Cristóvão; Santos, Rui; Magalhães, Fernando
- Known Mean, Unknown Maxima? Testing the Maximum Knowing Only the MeanPublication . Santos, Rui; Oliveira Martins, João Paulo; Felgueiras, MiguelIn the quantitative group testing problem, the use of the group mean to identify if the group maximum is greater than a prefixed threshold (infected group) is analyzed, using n independent and identically distributed individuals. Under these conditions, it is shown that the information of the mean is sufficient to classify each group as infected or healthy with low probability of misclassification when the underline distribution is a unilateral heavy-tailed distribution.
- Livro de Atas : XXXIV Congresso Internacional da SIPS (Sociedade Iberoamericana de Pedagogia Social) e 10.ª Conferência Internacional de Mediação Intercultural e Intervenção Social - ''Pedagogia Social e Mediação Intercultural: Teoria e Prática na Intervenção Socioeducativa''Publication . Vieira, Ricardo; Pérez de Guzmán Puya, María Victoria; Marques, José Carlos; Silva, Pedro; Vieira, Ana Maria; Margarido, Cristóvão; Matos, Rui; Santos, RuiO XXXIV Congresso Internacional da SIPS (Sociedade Iberoamericana de Pedagogia Social) e a 10.ª Conferência de Mediação Intercultural e Intervenção Social, realizados conjuntamente na ESECS.IPL - Escola Superior de Educação e Ciências Sociais do Instituto Politécnico de Leiria, nos dias 20 e 21 de outubro de 2021, cruzaram dois domínios simultaneamente distintos, mas, também, simultaneamente ‘irmãos’ na intervenção social empoderadora. Há, ainda, uma grande lacuna de estudos sobre a relação da Pedagogia Social e, em parte, de todas as profissões sociais, com a Mediação Intercultural que aposta no interventor que age dialogando, negociando, [mediando], empoderando, autonomizando, com práticas sempre de natureza relacional, no trabalho com sujeitos que pensam sobre si e sobre os outros e não com pessoas tantas vezes transformadas em objetos por parte do profissional social. A Pedagogia Social, enquanto ciência matriz quer da Educação Social, quer da Animação Sociocultural, quer mesmo do Serviço Social moderno, aponta para tudo menos para o assistencialismo e para a caridade na pretensa ajuda aos outros. Pelo contrário, alimenta profissões caraterizadas pela relação social de proximidade onde a escuta ativa, a comunicação no seu sentido lato, a empatia e o partir do outro para a construção da sua própria autonomização são fundamentais. Inevitavelmente, a Pedagogia Social desemboca nessas profissões, não raras vezes, através da Mediação Intercultural [enquanto paradigma essencialmente preventivo, transformador e socioeducativo] onde o interventor, ao contrário da mediação clássica, é tudo menos neutro. É tudo menos imparcial, como se procurará discutir e refletir neste congresso. O Pedagogo Social tem intenções de mudança, o que implica uma (trans)formação de si, da visão sobre si próprio e da visão sobre os outros.
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