Browsing by Issue Date, starting with "2018-08"
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- Education and development in early childhood in two portuguese cultural contexts: the mainland and AzoresPublication . Silva, Ana Isabel Mateus daThe various aspects of a child’s development (physical, psychological, emotional, relational, cognitive, linguistic, perceptive, and motor), as well as the child’s needs and attitudes, are key throughout his/her life and have been studied over the years by various researchers. We will examine the similarities and differences observed in the education and stimulation of children in two cultural contexts: on the Portuguese mainland (Lisbon, Almada, Santarém, Almeirim, and Portalegre regions) and Azorean islands (São Miguel, Pico, and Terceira). Our research focussed on children’s upbringing and development in the following areas: food and hygiene; cognitive and linguistic development; perceptual and motor development; emotional and relational development; sleep; and play and childcare practices. We identify several aspects that contribute to children’s positive physical and psychological development in the first two years of life, both on the mainland and in the Azores, examining aspects, such as sensory stimulation, sleep, types of play, and toys.
- Composition of an optimal portfolio in the Capital Market - Elton & Gruber Model in Portugal’s Capital MarketPublication . Pinho, Carlos; Melo, AugustoIn order to maximize their utility function, investors select some assets over others by choosing the ideal portfolio that will maximize their wealth. Each asset is chosen taking into account the relationship between the risk of that particular investment (usually measured by variance)- and the return it can offer, as well as the risk between this and other assets (as measured by covariance). The purpose of this work was to build an optimal portfolio using data on PSI-20's stock prices (2008-2016) where investors are aware of risk and want to minimize it. For this purpose, an optimal portfolio’s comparison in the period between 2004-2007 was conducted. This period was referred to as the financial pre-crisis, compared to the optimal portfolio obtained in the period after the financial crisis (2008-2016). The methodology used to estimate the expected profitability of each asset that makes up the PSI-20 was obtained by extracting the historical quotations from the Euronext Lisbon website. The Elton & Gruber model was used in order to determine the optimal portfolio, as well as the assets that should be part of it. In the period after the financial crisis, it can be verified in the optimal portfolio’s composition that, in the periods after the financial crisis and the financial crisis, there were no stocks to be included in the optimal portfolio, and an analysis in smaller periods was made. In the post financial crisis period actions were found with an attractiveness index superior to the cut-off point, which would lead them to be included in the optimal portfolio, and it was verified that the large distribution sector with (32.15%) has the greatest weight in the optimal portfolio, considering also the Oil and Gas (19.95%), Banking (11.84%) and Production (8.09%) sectors. While addressing shorter periods in pre financial crisis period, no asset was included in the optimal portfolio’s constitution.
- A “grande revolta” de Manufahi na revista Ilustração PortuguesaPublication . Sousa, LúcioEste artigo examina a emergência das imagens fotográficas sobre a colónia portuguesa de Timor nas revistas ilustradas portuguesas no início do século XX e, em particular, as relacionadas com a revolta de Manufahi na revista Ilustração Portuguesa, uma das revistas da época de maior divulgação. As imagens ilustram a ―vida colonial‖ daquela possessão num momento charneira na história da presença colonial portuguesa, em que se materializava, no terreno, a ocupação efetiva do território e se pretendia promover o interesse económico deste junto das elites da metrópole, distante.
- Mode of delivery and labour analgesia: a study of preference in portuguese pregnant womenPublication . Costa, Inês Coelho da; Nunes, Catarina S.; Machado, Humberto S.Background: Portugal has had one of the highest cesarean rates in Europe, possibly influenced by patient preferences. A reduction in the prevalence of these rates due to safety, quality, and concern with costs is one of the current goals of obstetric care. Fear of pain, often associated with vaginal delivery, is one of the reasons why pregnant women might prefer a cesarean section. Objective: The aim of this study was to identify the type of delivery and anaesthesia/analgesia preferred, as well as the reasons and factors associated with this preference, in a representative sample in order to identify possible modifiable factors possibly involved in increased rates. Methods: A descriptive cross-sectional study was carried out by an anonymous questionnaire to 245 pregnant women from February to April 2018. Respondents were also asked about their preference for peripartum anaesthesia/analgesia and on the sources of information that helped decide their preferences. Results: 22% of respondents would prefer an elective cesarean section. This preference was higher in women with a previous cesarean section. The preference for vaginal delivery was higher in women with more advanced pregnancies. The main reasons that led participants to prefer a vaginal delivery were the quicker postpartum recovery and not wanting to miss the first hours of their child's life. Regarding the preference for an elective cesarean section, the main reasons were fear and convenience. Most pregnant women preferred epidural analgesia. Respondents who selected their doctor (most common source) were more likely to prefer vaginal delivery. Conclusion: A minority of women showed a preference for cesarean delivery. A majority would prefer to have epidural anaesthesia. Despite the high cesarean rates, maternal desire for cesarean section is low, suggesting that this number is due to factors other than the preference of pregnant women.
- Tele-media-art: web-based inclusive teaching of body expressionPublication . Carvalho, Elizabeth; Marcos, AdéritoThe Tele-Media-Art project aims to promote the improvement of the online distance learning and artistic teaching process applied in the teaching of two test scenarios, doctorate in digital art-media and the lifelong learning course ”the experience of diversity” by exploiting multimodal telepresence facilities encompassing the diversified visual, auditory and sensory channels, as well as rich forms of gestural / body interaction. To this end, a telepresence system was developed to be installed at Palácio Ceia, in Lisbon, Portugal, headquarters of the Portuguese Open University, from which methodologies of artistic teaching in mixed regime - face-to-face and online distance - that are inclusive to blind and partially sighted students. This system has already been tested against a group of subjects, including blind people. Although positive results were achieved, more development and further tests will be carried in the future
- Large scale railway renewal planning with a multiobjective modeling approachPublication . Sousa, Nuno; Almeida, Luís Alçada; Rodrigues, João CoutinhoA multiobjective modeling approach for managing large scale railway infrastructure asset renewal is presented. An optimized intervention project schedule is obtained considering operational constraints in a three objectives model: evenly spreading investment throughout multiple years, minimizing total cost, minimizing work start postponements on higher priority railway sections. The MILP model was based on a real world case study; the objectives and constraints specified by an infrastructure management company. Results show that investment spreading greatly influences the other objectives and that total cost fluctuations depend on the overall condition of the railway infrastructure. The model can produce exact efficient solutions in reasonable time, even for very large-sized instances (a test network of similar size to the USA railway network, the largest in the world). The modeling approach is therefore a very useful, practical methodology, for generating optimized solutions and analyzing trade-offs among objectives, easing the task of ultimately selecting a solution and produce the works schedule for field implementation.
- Information systems governance and Industry 4.0: epistemology of data and semiotic methodologies of IS in digital ecosystemsPublication . Nobre, Ângela Lacerda; Duarte, Rogério; Jacquinet, MarcContemporary Information Systems management incorporates the need to make explicit the links between semiotics, meaning-making and the digital age. This focus addresses, at its core, pure rationality, that is, the capacity of human interpretation and of human inscription upon reality. Creating the new real, that is the motto. Humans are intrinsically semiotic creatures. Consequently, semiotics is not a choice or an option but something that works like a second skin, establishing limits and permeable linkages between: (i) human thought and human's infinite world of imagination; and (ii) human action, with its correspondent infinite world of intentionality, of desire and of unexplored possibilities. Two instances are contrasted as two reading lenses of current business reality: IS governance and industry 4.0. These phenomena correspond to the need to take accountability, transparency and responsibility into account, when designing IS and when using such systems through the ecology of connectivity, Big Data and the Internet of Things. Political, social and cultural dimensions are brought into the equation, when addressing the question of the relevance and adequateness of IS theory and practice to respond to contemporary challenges. The message is that what has already been achieved is but a shadow, a pale vision, of what might be achieved in the age of the new Renaissance.