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Póvoa e Meadas, Portugal

Ferreira M.,Portuguese Institute for Quality | Matos A.,UNIDEMI
Journal of Physics: Conference Series | Year: 2015

The purpose of this paper is to identify and analyze some relevant issues which arise when the concept of metrological traceability is applied to health care facilities. Discussion is structured around the results that were obtained through a characterization and comparative description of the practices applied in 45 different Portuguese health entities. Following a qualitative exploratory approach, the information collected was the support for the initial research hypotheses and the development of the questionnaire survey. It was also applied a quantitative methodology that included a descriptive and inferential statistical analysis of the experimental data set. © Published under licence by IOP Publishing Ltd. Source


Nunes I.L.,New University of Lisbon | Figueira S.,UNIDEMI | Machado V.C.,New University of Lisbon
Lecture Notes in Business Information Processing | Year: 2012

This work presents an application of the Supply Chain Disturbance Management Fuzzy Decision Support System designed to support decision-making processes aimed at improving the performance/resilience of Supply Chains. The Fuzzy Decision Support System analyses the effects of Supply Chain disturbances and the effects of implementing mitigation (proactive) and/or contingency (reactive) plans set to counter such disturbances, reducing their negative impacts. This paper illustrates the application of the Fuzzy Decision Support System in real life support of Supply Chain management using an academic case study where four scenarios related with an automotive Supply Chain are presented. The analysis of the Performance Index of each Supply Chain entity and the analysis of the Supply Chain Performance Index allow the selection of the operational policy whose implementation ensures best Supply Chain resilience. © 2012 Springer-Verlag. Source


Jardim-Goncalves R.,UNINOVA | Grilo A.,UNIDEMI
Automation in Construction | Year: 2010

The Single European Electronic Market (SEEM) is expected to stimulate the take-up of eBusiness in Europe, increasing the competitiveness of SMEs through advanced eBusiness process models and tools, by offering to companies a model for modernizing work organization that allows them to face changing markets with an effective use of Information and Communication Technologies (ICT). However, the Building and Construction industry (B&C) has its ICT fragmented, having in the Building Information Model (BIM) paradigm a vehicle to address this problem. Interfacing with BIM brings another layer of complexity, mostly due to the heterogeneity of the systems and applications that need to interface with it. Thus, the adoption of a cluster of proper services in the Web that can offer in a unique way the functionalities needed for the adoption of BIM, is essential. The implementation of BIM under the Cloud Computing paradigm holds the promise of accelerating the B&C industry to achieve the Single Electronic Market. After presenting the vision for a Single European Electronic Market, and the expectation of the B&C sector to be integrated in a universal information space, this paper proposes the SOA4BIM framework as a cloud of services that enables universal access to the BIM paradigm by any system, application, or end user on the web. © 2009 Elsevier B.V. All rights reserved. Source


Ruivo C.R.,University of Algarve | Ruivo C.R.,University of Coimbra | Vaz D.C.,UNIDEMI | Vaz D.C.,New University of Lisbon
Applied Energy | Year: 2015

Nowadays, simulation tools are available for calculating the thermal loads of multiple rooms of buildings, for given inputs. However, due to inaccuracies or uncertainties in some of the input data (e.g., thermal properties, air infiltrations flow rates, building occupancy), the evaluated thermal load may represent no more than just an estimate of the actual thermal load of the spaces. Accordingly, in certain practical situations, simplified methods may offer a more reasonable trade-off between effort and results accuracy than advanced software. Hence, despite the advances in computing power over the last decades, simplified methods for the evaluation of thermal loads are still of great interest nowadays, for both the practicing engineer and the graduating student, since these can be readily implemented or developed in common computational-tools, like a spreadsheet.The method of Mackey and Wright (M&W) is a simplified method that upon values of the decrement factor and time lag of a wall (or roof) estimates the instantaneous rate of heat transfer through its indoor surface. It assumes cyclic behaviour and shows good accuracy when the excitation and response have matching shapes, but it involves non negligible error otherwise, for example, in the case of walls of high thermal inertia.The aim of this study is to develop a simplified procedure that considerably improves the accuracy of the M&W method, particularly for excitations that noticeably depart from the sinusoidal shape, while not introducing a need for an excessive volume of data or complexity in the production of results.In the first simplified procedure discussed in the paper, a full-featured excitation is decomposed into a Fourier series and then the wall's thermal behaviour is reconstructed from the application of the M&W method to each of the N sinusoidal components. Even though this established approach can lead to the most accurate results, given a sufficiently high N, it requires the knowledge of the decrement factor and time lag associated to each component of the Fourier series, which can represent a considerable amount of data.The chief result of the research though is a novel procedure based on a parameter, γ, that weigh-averages the approximate solution obtained by considering a single term Fourier decomposition of the excitation and the solution by considering the actual excitation. The procedure is more accurate than the original M&W method and will be of interest to researchers with the means of generating values of γ for the walls which the end users of their research are interested in. It provides promising results for walls ranging from massive to negligible mass. It has been noticed that while using the same values of γ that had been optimized for the wall facing east, acceptable results are also obtained when altered external excitations are imposed, namely due to intermittency of the direct solar radiation or due to a distinct value of the external heat transfer coefficient. © 2015 Elsevier Ltd. Source


Azevedo S.G.,University of Beira Interior | Carvalho H.,UNIDEMI | Cruz-Machado V.A.,UNIDEMI
Advances in Intelligent Systems and Computing | Year: 2014

The aim of this paper is to gain a better understanding on the deployment of the RFID in the fast fashion supply chain (FFSC), mainly its application in logistics operations, influence on performance, disadvantages, and barriers. The RFID experience of fifteen international FFSC companies is analysed. In the case studies the RFID in FFSC is deployed mainly to support receiving, tracking of raw materials, semi-finished components, and finished garments, and shipping logistics operations. The performance improvements recognized are: a decrease on stock outs, better production and supply availability, less shrinkage and theft, more efficient use of storage space, improvement in up selling, better inventory management, and process visibility. The RFID tag cost is the main disadvantage and the integration with current processes is the main barrier to the RFID deployment. © Springer-Verlag Berlin Heidelberg 2014. Source

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