Póvoa e Meadas, Portugal
Póvoa e Meadas, Portugal
Time filter
Source Type

Correia J.,New University of Lisbon | Mourao A.,New University of Lisbon | Cavique M.,UNIDEMI
MATEC Web of Conferences | Year: 2017

The introduction of cooling systems in the wine industry to control the fermentation has allowed the oenologist to produce more and more excellent wines. In this regard, the alcoholic fermentation is a target for various studies that aims at explaining the chemical reactions involved in the release of energy. The aim of this paper is to evaluate the energy consumption of a winery and to discuss and understand the main parameters involved in the process of fermentation. The weather profile during fermentation and the schedule of charging the tanks with freshly affect strongly the needs of cooling power, and the energy use. The study conducted at the Adega da Ervideira in the South of Portugal allowed to define a model for the computation of the cooling power and the electricity consumption. The heat gains from outdoor in convection mode and the heat released during maturation and fermentation phases are the main contributors for the cooling requirements at a winery. As a result of the real fact study, it will allow an oenologist to estimate the cooling power and energy for a winery as well as to produce other types of wines. © 2017 The Authors, published by EDP Sciences.

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.

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.

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.

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.

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.

do Ceu Ferreira M.,Portuguese Institute for Quality | Matos A.,UNIDEMI | Leal R.P.,UNIDEMI
Accreditation and Quality Assurance | Year: 2015

To evaluate the role of metrology in healthcare facilities, a study was performed among Portuguese hospitals to identify and analyze issues concerning the concept of metrological traceability. The discussion is structured around a dataset obtained from a survey questionnaire covering 44 public and private Portuguese hospitals. The principal results of our analysis include identifying some key indicators that apply to certified/accredited hospitals. Test reports and calibration certificates were the main metrological traceability documents required by the hospitals. The acquisition of medical measuring instruments with conformity reports depended on the type of hospital. Maintenance was considered the most relevant issue for private hospitals, whereas for the public hospitals, this issue is less important than trust in the supplier. For public hospitals, purchase price was the most important requirement. For hospitals that acquire calibrated measuring instruments, only 50 % perform in-house calibration. We conclude that trust in supplier is associated with a lower overall budget for maintenance operations. The protocol established by hospitals to acquire measurement instruments does not reflect metrological concerns, and the relationship between maintenance and metrological operation is not well established. Thus, we conclude that metrological traceability is largely absent in the daily considerations of healthcare professionals and facilities. © 2015, Springer-Verlag Berlin Heidelberg.

Zutshi A.,UNIDEMI | Grilo A.,UNIDEMI | Jardim-Goncalves R.,Cts Inc.
Computers in Industry | Year: 2012

Over the last decade, the context of interoperability has been changing rapidly. It has been expanding from the largely technically focused area of Information Systems toward Business Processes and Business Semantics. However, there exists a need for established methods to define Business Interoperability and provide for measuring its performance as a first step toward improving interoperability conditions between collaborating entities. This paper proposes a model that captures the factors that are responsible for Business Interoperability in the context of collaborative business processes. The Business Interoperability Quotient Measurement Model (BIQMM) uses an interdisciplinary approach to embrace the key elements responsible for collaboration performance. Through the quantification of the importance of each element to the particular collaboration scenario, and by combining the BIQMM with the Analytical Network Process (ANP) approach, this model enables a quantitative analysis of Business Interoperability, so that an overall interoperability score can be calculated for enhanced performance measurements. Two application scenarios are presented, validating the proposed model. © 2012 Elsevier B.V. All rights reserved.

Frausto-da-silva T.,UNIDEMI | Grilo A.,UNIDEMI | Cruz-Machado V.,UNIDEMI
Lecture Notes in Electrical Engineering | Year: 2015

This paper proposes the application of Markowitz’s Modern Portfolio Theory to the selection of digital communication channels, in order to attain the finest trade-off between return on investment and risk. Previous application of financial portfolio theory in Marketing, as a means to optimize the portfolio, focused solely on the use of the model in decisions related to product, customer and customer segment, retail format and price promotion portfolios. The authors concluded that the Modern Portfolio Theory may be used as a decision support system in the selection of a company’s Digital Marketing channels or tactics, mutatis mutandis, so to find the share of the communication budget to be allocated to each type of digital channel or tactic © Springer-Verlag Berlin Heidelberg 2015.

Chantarachalee K.,UNIDEMI | Carvalho H.,UNIDEMI | Cruz-Machado V.A.,UNIDEMI
Advances in Intelligent Systems and Computing | Year: 2014

This paper provides perspectives on how to design lean supply chains. It describes a real case study related to construction materials supply chain. In the case study is considered a supply chain setting where the dealer’s have dominant bargaining power over the manufacturer. It intents to analyze the impact of this setup in overall performance in terms of lead time and how the supply chain could be designed to be more lean. First, a value stream map, a deployment flowchart and a simulation model are presented to describe the case study. Second, a lean tool, the 7-wastes, is used to analyze and redesign the supply chain configuration. Using simulation, is possible to conclude that this new configuration allows a lead time reduction. Finally the conclusions are presented, highlighting how the lean tools can be used in a real supply chain setting. © Springer-Verlag Berlin Heidelberg 2014.

Loading UNIDEMI collaborators
Loading UNIDEMI collaborators