2015
Autores
Castro, A; Moukadem, A; Schmidt, SE; Dieterlen, A; Coimbra, MT;
Publicação
BIOSIGNALS
Abstract
In this exploratory study we propose to analyze, in healthy adult volunteers, the heart electrical (electrocardiogram, ECG) and mechanical (phonocardiogram, PCG) activity during exercise. Heart sounds amplitude, frequency content, and RS2, may be important features in the non-invasive assessment of heart activity, such as for the estimation of cardiac output and blood pressure. Nine healthy volunteers were monitored with ECG and PCG simultaneously, under a stress test. After each workload level a 10 s window of signal was collected. PCG first (S1) and second (S2) heart sounds were manually annotated, based on time of QRS complex occurrence. A QRS detector was implemented to detect the QRS complex, and time intervals between electrical and mechanical events. Extracted features were analyzed in relation to heart rate (HR), including RS2, S1 and S2 amplitudes, and high frequency content of S1 and S2. Spearman correlation was used. Changes between baseline and maximum workload stage/HR for each volunteer were analyzed. Significant correlation was observed between HR, and all characteristics extracted (P<0.01). There was a clear difference between all variables from baseline to maximum workload level: with increasing workload/HR heart sounds amplitude increased (more pronounced in S1), RS2 decreased, and high frequency content of S2 decreased in relation to the high frequency content of S1, demonstrating that dynamic cardiovascular relations are individualized during cardiac stress and that assumptions for resting conditions may not be assumed.
2015
Autores
Silva, D; Gomes, P; Pinto, JA; Ramalho, F;
Publicação
Handbook of Research on Effective Project Management through the Integration of Knowledge and Innovation
Abstract
This chapter presents the preliminary results of an IT organizational project management maturity research called OPM3® Portugal Project, which is currently underway. It was designed by Portuguese research and development organization Ambithus, based on PMI's (Project Management Institute) OPM3® (Organizational Project Management Maturity Model) standard. A descriptive analysis of IT organizations is made, the case studies selection criteria are explained, and a relevant literature revision of clustering models is made. Preliminary results from the IT organizations are presented and organized by Project Management and Portfolio Management processes, and Organizational Enablers. After the results analysis, it presents a list of processes and procedures that serves as the guidelines for what IT organizations need to improve to obtain a better level of maturity in Project Management. The overall results show that the IT Portuguese industry is strong on its processes and has a good level of maturity in project management.
2015
Autores
Lima, J; Goncalves, J; Costa, PJ;
Publicação
CONTROLO'2014 - PROCEEDINGS OF THE 11TH PORTUGUESE CONFERENCE ON AUTOMATIC CONTROL
Abstract
A laser scanner is a popular sensor widely used in industry and mobile robots applications that measures the distance to the sensor on a slice of the plan. This sensor can be used in mobile robots localization task. In this paper, a low cost laser scanner sensor is modelled so that it can be implemented in a simulation environment. The simulation reflects the laser model properties such as target colour dependences, noise, limits and time constraints. A correction of the laser scanner nonlinearities is proposed. The noise spectrum is also addressed.
2015
Autores
Ferreira, LL; Pinho, LM; Albano, M; Teixeira, C;
Publicação
SIGBED Rev.
Abstract
2015
Autores
Pinho, LM;
Publicação
Ada User Journal
Abstract
2015
Autores
Mesquita Brandao, RFM; Beleza Carvalho, JAB; Maciel Barbosa, FPM;
Publicação
2015 IEEE EINDHOVEN POWERTECH
Abstract
New generations of turbines have lower repair and maintenance costs than the previous generation. This is justified by the development of new components and materials. As the power of newer turbines is usually substantially larger, it is possible to get an economy of scale and lower maintenance costs per kW of rated power. This is simply because it is not needed to service a large turbine more often than a small one. New methods of earlier detection of faults are needed. The use of all information from SCADA (Supervisory Control and Data Acquisition) system can be useful, but it is necessary to develop tools to deal with bigger amount of information. Neural networks can help and turn possible new maintenance and operation schemes.
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