Browsing by Issue Date, starting with "2009-07"
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- Uma casa para a vida: aplicação do design inclusivo à habitaçãoPublication . Simões, Jorge Falcato; Braz, Miguel; Gouveia, Pedro Homem de; Bispo, Renato; Lorena, Maria JoséPretende-se com esta edição apoiar os esforços de todos aqueles que queiram criar edifícios de habitação adequados às reais necessidades dos utilizadores. Usufruir de uma habitação com dimensões adequadas, que proporcione conforto, autonomia, segurança e privacidade é uma necessidade básica – e um direito essencial. Assegurar esse direito passa por criar – construindo de raiz, ou adaptando – edifícios de habitação que sejam capazes de responder à diversidade de necessidades existentes no conjunto da população, e que estejam preparados para acomodar as diferentes necessidades que surgem ao longo da vida de cada morador.
- Application of near infrared spectroscopy and multivariate data analysis for the evaluation of glue lines of untreated and copper azole treated laminated timber before and after ageingPublication . Gaspar, Florindo; Lopes, João; Cruz, Helena; Schwanninger, Manfred; Rodrigues, José; Gaspar, FlorindoThe necessity for inspection and assessment of glued laminated timber structures in service has raised interest in the evaluation of the glue lines. Glue line spectra were analysed and are discussed in detail with respect to spectral contributions from the adhesive, the hardener, the wood lamella below the adhesive, the curing temperature as well as ageing-related spectral changes. The combination of near infrared (NIR) spectroscopy and principal component analysis (PCA) allowed distinguishing between aged and non-aged samples and different copper azole preservative treatment levels of phenol-resorcinol-formaldehyde (PRF) glue lines. NIR-based partial least squares (PLS) regression modelling was performed for the glue line shear strength and for the curing temperature. These findings show that NIR spectroscopy is a fast and useful technique to evaluate the degradation on the PRF glue lines of untreated and copper azole treated laminated timber.
- High dynamic range - a gateway for predictive ancient lightingPublication . Gonçalves, Alexandrino José Marques; Magalhães, Luís; Moura, João; Chalmers, AlanIn the last few years, the number of projects involving historical reconstruction has increased significantly. Recent technologies have proven a powerful tool for a better understanding of our cultural heritage through which to attain a glimpse of the environments in which our ancestors lived. However, to accomplish such a purpose, these reconstructions should be presented to us as they may really have been perceived by a local inhabitant, according to the illumination and materials used back then and, equally important, the characteristics of the human visual system. The human visual system has a remarkable ability to adjust itself to almost all everyday scenarios. This is particularly evident in extreme lighting conditions, such as bright light or dark environments. However, a major portion of the visible spectra captured by our visual system cannot be represented in most display devices. High dynamic range imagery is a field of research which is developing techniques to correct such inaccuracies. This new viewing paradigm is perfectly suited for archaeological interpretation, since its high contrast and chromaticity can present us with an enhanced viewing experience, closer to what an inhabitant of that era may have seen. In this article we present a case study of the reconstruction of a Roman site. We generate high dynamic range images of mosaics and frescoes from one of the most impressive monuments in the ruins of Conimbriga, Portugal, an ancient city of the Roman Empire. To achieve the requisite level of precision, in addition to having a precise geometric 3D model, it is crucial to integrate in the virtual simulation authentic physical data of the light used in the period under consideration. Therefore, in order to create a realistic physical-based environment, we use in our lighting simulations real data obtained from simulated Roman luminaries of that time.
- Adaptive knowledge discovery for decision support in intensive care unitsPublication . Gago, Pedro; Santos, Manuel FilipeClinical Decision Support Systems (CDSS) are becoming commonplace. They are used to alert doctors about drug interactions, to suggest possible diagnostics and in several other clinical situations. One of the approaches to building CDSS is by using techniques from the Knowledge Discovery from Databases (KDD) area. However using KDD for the construction of the knowledge base used in such systems, while reducing the maintenance work still demands repeated human intervention. In this work we present a KDD based architecture for CDSS for intensive care medicine. By resorting to automated data acquisition our architecture allows for the evaluation of the predictions made and subsequent action aiming at improving the predictive performance thus enhancing adaptive capacities.
- Competitividade nacional, conhecimento e investimento estrangeiroPublication . Ferreira, Manuel Portugal; Serra, Fernando A. Ribeiro; Duarte, Carlos; Marques, TâniaAs condições que promovem a competitividade nacional têm sido objecto de política governamental e debatidas no meio académico e empresarial. Neste artigo discutimos as condições de competitividade nacional em termos de sistemas de inovação, investimento do e no estrangeiro, capacidades tecnológicas e instituições. Os países inovadores beneficiam de efeitos de aprendizagem localizada que podem ser utilizados internamente e explorados no estrangeiro. A participação em redes de pesquisa e desenvolvimento não é a única avenida para o desenvolvimento tecnológico na presença de uma atitude de aprendizagem e adopção das mais recentes tecnologias.
- Factorizations of Möbius gyrogroupsPublication . Ferreira, MiltonIn this paper, we consider a Möbius gyrogroup on a real Hilbert space (of finite or infinite dimension) and we obtain its factorization by gyrosubgroups and subgroups. It is shown that there is a duality relation between the quotient spaces and the orbits obtained. As an example, we present the factorization of the Möbius gyrogroup of the unit ball in R^n linked to the proper Lorentz group Spin+(1, n).
- Is the international business environment the actual context for international business research?Publication . Ferreira, Manuel Portugal; Li, Dan; Guisinger, Stephen; Serra, Fernando A. RibeiroThe International Business Environment (IBE) has been argued to be the essential context for international business (IB) studies and the distinguishing factor from other management studies and studies of large enterprises. Two content analysis show that many papers published in top tier IB journals either lack reference to any dimension of the IBE or tend to be uni-or bi-dimensional when addressing the IBE; it is not a surprise that the cultural dimension is the most often used. We suggest that: (a) there is need to developed more uni and multi-dimensional environmental constructs; (b) a more holistic view of the IBE provides richer insights on the actual complexity underlying IB research. Future studies that provide more comprehensive models of the IBE that overcome the usual broad classifications of the international environment as undefined and uncontrollable factors are warranted to advance conceptual and empirical research.
- Stability and performance analysis of the Open Box Transport ProtocolPublication . Loureiro, Paulo; Monteiro, EdmundoIn this paper we study the stability of the Open Box Transport Protocol (OBP), an explicit congestion control protocol that provides information to the end systems about the current state of the network path. To support the study we deduced the OBP transfer function, which modulates the OBP behavior at equilibrium. In the stability evaluation we use Bode and Nyquist diagrams. The OBP stability characteristics, discussed in this work, are only related with the equilibrium phase, in other words when all the network capacity is in use. The results show that the OBP is stable for the tested scenarios and the transfer function does not have unstable poles. We also present an evaluation process that helps to identify the OBP performance. We show that the OBP reaches high utilization of the bottleneck channel and has fairness skills.
- WINSYS 2009 - International Conference on Wireless Information Networks and Systems, Proceedings: ForewordPublication . Caldeirinha, Rafael; Obaidat, Mohammad S.We warmly welcome you to WINSYS 2009 - the International Conference on Wireless Information Networks and Systems, which is held, this year in Milan, Italy. This conference reflects a continuing effort to increase the dissemination of recent research among professionals who work on the field of Wireless Information Systems. WINSYS is integrated as one of the modules of the ICETE joint conference.
- Closed loop knowledge discovery for decision support in intensive care medicinePublication . Gago, Pedro; Santos, Manuel FilipeClinical Decision Support Systems (CDSS) are becoming commonplace. They are used to alert doctors about drug interactions, to suggest possible diagnostics and in several other clinical situations. One of the approaches to building CDSS is by using techniques from the Knowledge Discovery from Databases (KDD) area. However using KDD for the construction of the knowledge base used in such systems, while reducing the maintenance work still demands repeated human intervention. In this work we present a KDD based architecture for CDSS for intensive care medicine. By resorting to automated data acquisition our architecture allows for the evaluation of the predictions made and subsequent action aiming at improving the predictive performance thus closing the KDD loop.