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da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida
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- Time-variable blood flow averaged waveformsPublication . Leiria, A.; da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Evans, D. H.; Ruano, M. GraçaThe computation of the average of random signals is addressed in this article. These averaging techniques are particularly relevant for Doppler blood flow clinical evaluation and research that usually accesses clinical indicators related to maximum and mean frequency, bandwidth and power variation over time. A novel technique is presented and compared to one previously described in the literature (Kitney and Giddens, "Analysis of blood velocity waveforms by phase shift averaging and autoregressive spectral estimation'', J. Biomech. Eng., 105, 398 - 404, 1983.). While the latter method is an iterative one, which sometimes does not converge, the former is a sequential technique, guaranteeing convergence. Clinical Doppler blood flow signals were averaged using both methods and the resulting waveforms were evaluated against the original signals, emphasising the impact on the relevant spectral parameters. The results obtained showed that, except for the maximum error in the computation of power variation over time, the errors produced are reduced by the proposed new algorithm.
- Towards Green IT: Assessing the environmental impact of Public AdministrationPublication . Landum, Manuel; Madeira e Moura, Maria Margarida; Reis, LeonildeThe Public Administration (PA) in Portugal is impacted by the constant acceleration and evolution of Information and Communication Technologies (ICT), where the Portuguese State, transposing European Union directives, has legislated and encouraged their use as instruments of added value for the PA. Establishing rigorous and sustainable governance is crucial, ensuring that the organization’s strategic objectives are aligned with ICT and, preferably, with Green IT practices. In this context, it is necessary to be able to estimate and subsequently evaluate the impact of strategic and operational choices on improving environmental quality. For such, this article presents a framework developed to optimize ICT management practices and indicators that, in this environmental area, support the forecasting and assessment of the impact of the choices made in the search for technologically advanced solutions in the Barreiro municipality. These choices enable, among other things, a reduction in energy consumption, implying a reduction in financial costs, resulting in environmental benefits, such as a reduction in CO2 emissions into the atmosphere or less deforestation. The results presented, obtained in a real-world context, make it possible to assess the progress of alignment with Green IT in this area, as well as the overall result.
- Boas práticas de TIC em alinhamento com o Green ITPublication . Landum, Manuel; Moura, Maria Margarida da Cruz Silva Andrade Madeira e Carvalho de; Reis, LeonildeAs Tecnologias de Informação e Comunicação estão de tal forma enraizadas no nosso dia a dia que sem elas seria difícil manter a sociedade em funcionamento. Um desses exemplos é a Administração Pública, onde os processos circulam eletronicamente entre a administração central, regional ou local, permitindo uma maior celeridade, tendo em conta a facilidade de envio e receção da documentação. Esta realidade, conjugada com a pressão exercida pelos munícipes ou cidadãos em geral sobre a administração, conduz à necessidade de modernização e expansão dos serviços, tornando-os ubíquos, permitindo uma maior mobilidade, mais céleres, reduzindo os tempos de resposta, e uma consolidação das infraestruturas tecnológicas. Assim sendo, estas práticas devem assentar em pilares como a sustentabilidade, reforço da segurança da informação e melhoria da qualidade ambiental. O objetivo do artigo centra-se na apresentação de boas práticas das TIC alinhadas com o Green IT, suportadas em standards internacionais e frameworks, para otimização de práticas nas organizações, nomeadamente na Administração Local. Os principais resultados da abordagem vão no sentido de contribuir de forma ativa para a implementação de políticas de sustentabilidade e o alinhamento com as boas práticas do Green IT, na Administração Local.
- Processamento em tempo-real de sinais doppler de fluxo sanguíneoPublication . da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Ruano, M. Graca
- A framework for blood flow analysis and researchPublication . Ruano, Maria; Da Cruz Silva Andrade Madeira E Carvalho De Moura, Maria Margarida; Leiria, A.; Garcia, F.; Moreno, E.A framework to support research and clinical applications on ultrasound Doppler blood flow signals' analysis was created by integration of several subsystems into a portable computer application. Several alternatives of the different subsystems were integrated allowing the comparison amongst them. Aiming initially the study of carotid artery blood flow signals, the framework is being extended to encompass different vases -such as the mean cerebral artery - and some cardiac valves -such as the aortic and mitral valves. Developed upon Debian Linux distribution, but portable to other operating systems, the application components considered were built from open source software.
- Adaptive system for blood flow estimationPublication . da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Leiria, A.; Ruano, M. GraçaAdaptive estimation of blood flow signals is performed resorting to a framework developed to support research on Doppler blood flow signals' analysis. Real time spectral estimation methods, real time performance evaluation and run-time adjustment of the estimation methods parameters are bound together allowing the system to adapt itself to varying signal characteristic that are caused by physiological reasons.
- Adaptive system for blood flow estimationPublication . da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Leiria, A.; Ruano, M. GraçaAdaptive estimation of blood flow signals is performed resorting to a framework developed to support research on Doppler blood flow signals' analysis. Real time spectral estimation methods, real time performance evaluation and run-time adjustment of the estimation methods parameters are bound together allowing the system to adapt itself to varying signal characteristics that are caused by physiological reasons.
- Assessment of utilization and willingness to use it devices to support health managementPublication . Espírito-Santo, Margarida; Lapão, Nelson; Peixoto, Stefany; Da Cruz Silva Andrade Madeira E Carvalho De Moura, Maria MargaridaBackground Amongst the technological solutions that aim to facilitate daily tasks, the potential contributions of mhealth is significant, mainly within the crescent elderly population presenting chronic diseases and using medication. Thus, this study aimed to assess the utilization and willingness to use IT devices to support health management, such as medication management. Methods A cross-sectional study was held, including the application (face-to-face and online) of an electronic questionnaire, with 164 participants. Data were processed using SPSS v27. Results Study participants had a mean age of 37.6 ± 20.0 years old, 23.8% were ≥ 60 years old, 73.2% female, 28% declared to suffer a chronic disease, with 27.4% using chronic medication and mostly managed by oneself (71.1%). Most of the participants owned and used a mobile phone (respectively 93.9% and 59.8%), a tablet (48.8% and 44.5%), and a computer (73.8% and 17.1%). Only about half of the participants aged ≥ 60 years declared to use their mobile devices to internet access (mobile phones 51.3%, tablet 35.9% and computers 41%). In this group, only 2% mentioned using applications in the health area. Overall, 85.4% considered these tools could be useful, although fewer would be willing to buy them (33.6% for < 60 years and 66.7% for ≥ 60 years). Conclusions The use of IT devices is less widespread in the older population, the age groups with greatest need for tools to support health management. Future development of this area must pay special attention to target audience characteristics and their limitations in the use of technology.
- Time, time-frequency and displacement-frequency analysis of embolic signalsPublication . Leiria, A.; da Cruz Silva Andrade Madeira e Carvalho de Moura, Maria Margarida; Ruano, M. Graça; Evans, D. H.The characteristics of a new method, the displacement-frequency representation, prompted the study of its use for the analysis of embolic blood flow signals. This paper reports the comparison of displacement-frequency and time-frequency methods with time domain methods, in the characterization of emboli. The study was performed on clinical signals derived from gaseous and particulate embolic events. The results obtained with the different approaches were compared. The conclusions of this study provide encouragement for the use of displacement-frequency domain processing for this kind of analysis.