Browsing by Issue Date, starting with "2010-12"
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- Tone mapping operators on small screen devices: an evaluation studyPublication . Urbano, C.; Magalhães, L.; Moura, J.; Bessa, M.; Marcos, Adérito Fernandes; Chalmers, A.In the last decade, many techniques have been developed to reproduce high dynamic range imagery on traditional displays. These techniques, known as Tone Mapping Operators (TMOs), have been compared and ranked in different ways according to several image characteristics. However, none of these algorithms has been developed specifically for small-screen devices (SSD). In this paper, we evaluate currently used TMOs to show that SSDs with limited size, resolution and colour depth require specific research to find or create an appropriate solution. The research described in this paper is based on psychophysical experiments using three different types of displays (CRT, LCD and SSD). The obtained results show that rankings obtained are similar for the LCD and CRT but are significantly different for the SSD. Furthermore, these rankings show additionally that some characteristics of TMOs need to be emphasized to obtain better high-fidelity mapped images for SSDs.
- Perspetivas : acordo ortográfico da língua portuguesaPublication . Silva, Mário Filipe daA adoção próxima, por parte de Portugal, do Acordo Ortográfico da Língua Portuguesa (AOLP)em 2011, após o mesmo ter sucedido no Brasil a 1 de janeiro de 2010, que perspetivas abre, no âmbito da sua aplicação, e o que pode trazer este Acordo para Portugal e para os restantes países da CPLP?
- Lifelong learning: conceptualizations in european educational policy documentsPublication . Alves, Mariana G.; Gomes, Elisabete X.Over recent years, lifelong learning has been a central and guiding principle in the formulation of European educational policies. Within this general framework, the authors have been developing a research project that allows them to approach the theme of lifelong learning and European educational policies, taking into account four levels of analysis, namely: the supranational, the national, the institutional and, finally, the individual level of analysis. This methodological strategy reflects a theoretical understanding of policy as the result of the actions of a diversity of actors at different levels. This article focuses on the supranational level of analysis, drawing on data from an analysis of European educational policy documents. First, the authors clarify the methodological issues raised by the research findings presented. Second, they discuss the results concerning the process of definition of European educational policies. Third, the authors briefly revisit the evolution of the idea of lifelong learning and discuss the results regarding its plurality of meanings and conceptualizations within the documents considered for analysis.
- BIB designs with repeated blocks: review and perspectivesPublication . Oliveira, TeresaExperimental Design plays an important role on establishing an interface between Applied Mathematics and statistical applications in several fields, like Agriculture, Industry, Genetics,Biology and Education Sciences. The goal of any Experimental Design is to obtain the maximum amount of information for a given experimental effort, to allow comparisons between varieties and to control for sources of random variability. Randomized block designs are used to control for these sources. A Balanced Incomplete Block Design (BIB Design) is a randomized block design with number of varieties greater than the block size and with all pairs of varieties occurring equally often along the blocks. The Fisher related information of a balanced block design will remain invariant whether or not the design has repeated blocks. This fact can be used theoretically to build a large number of non-isomorphic designs for the same set of design parameters, which could be used for many different purposes both in experimentations and surveys from finite populations. The original and most important method on the construction of BIB Designs with repeated blocks (BIBDR) is due to Hedayat and Li (1979): the trade-off method. Since then, many authors and researchers have been paying particular attention to the construction of BIBDR, but still some unsolved problems remain. This issue will be briefly reviewed and new results on the existence and construction of BIBDR, as well as several unsolved problems for further research will be presented.
- A teoria de los estilos de aprendizaje y el uso de las tecnologías en el proceso educativoPublication . Barros, Daniela Melaré VieiraEste artigo destaca os elementos centrais que definem e caracterizam a teoria de estilos de aprendizagem. O objetivo deste estudo é enfatizar o uso das tecnologias na Educação e a teoria de estilos de aprendizagem como estratégias essenciais para enriquecer o processo educacional.