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Publications

Publications by CTM

2018

Analysis of LoRaWAN v1.1 security

Authors
Butun, I; Pereira, N; Gidlund, M;

Publication
Proceedings of the 4th ACM MobiHoc Workshop on Experiences with the Design and Implementation of Smart Objects

Abstract

2018

A framework for web application integrity

Authors
Fortuna, P; Pereira, N; Butun, I;

Publication
ICISSP 2018 - Proceedings of the 4th International Conference on Information Systems Security and Privacy

Abstract
Due to their universal accessibility, interactivity and scaling ease, Web applications relying on client-side code execution are currently the most common form of delivering applications and it is likely that they will continue to enter into less common realms such as IoT-based applications. We reason that modern Web applications should be able to exhibit advanced security protection mechanisms and review the research literature that points to useful partial solutions. Then, we propose a framework to support such characteristics and the features needed to implement them, providing a roadmap for a comprehensive solution to support Web application integrity. Copyright

2018

Supervised learning methods for pathological arterial pulse wave differentiation: A SVM and neural networks approach

Authors
Paiva, JS; Cardoso, J; Pereira, T;

Publication
INTERNATIONAL JOURNAL OF MEDICAL INFORMATICS

Abstract
Objective: The main goal of this study was to develop an automatic method based on supervised learning methods, able to distinguish healthy from pathologic arterial pulse wave (APW), and those two from noisy waveforms (non-relevant segments of the signal), from the data acquired during a clinical examination with a novel optical system. Materials and methods: The APW dataset analysed was composed by signals acquired in a clinical environment from a total of 213 subjects, including healthy volunteers and non-healthy patients. The signals were parameterised by means of 39 pulse features: morphologic, time domain statistics, cross-correlation features, wavelet features. Multiclass Support Vector Machine Recursive Feature Elimination (SVM RFE) method was used to select the most relevant features. A comparative study was performed in order to evaluate the performance of the two classifiers: Support Vector Machine (SVM) and Artificial Neural Network (ANN). Results and discussion: SVM achieved a statistically significant better performance for this problem with an average accuracy of 0.9917 +/- 0.0024 and a F-Measure of 0.9925 +/- 0.0019, in comparison with ANN, which reached the values of 0.9847 +/- 0.0032 and 0.9852 +/- 0.0031 for Accuracy and F-Measure, respectively. A significant difference was observed between the performances obtained with SVM classifier using a different number of features from the original set available. Conclusion: The comparison between SVM and NN allowed reassert the higher performance of SVM. The results obtained in this study showed the potential of the proposed method to differentiate those three important signal outcomes (healthy, pathologic and noise) and to reduce bias associated with clinical diagnosis of cardiovascular disease using APW.

2018

A Statistical Comparative Study of Photoplethysmographic Signals in Wrist-Worn and Fingertip Pulse-Oximetry Devices

Authors
Gadhoumi, K; Keenan, K; Pereira, T; Colorado, R; Meisel, K; Hu, X;

Publication
Computing in Cardiology Conference (CinC) - 2018 Computing in Cardiology Conference (CinC)

Abstract

2018

Robust Assessment of Photoplethysmogram Signal Quality in the Presence of Atrial Fibrillation

Authors
Pereira, T; Gadhoumi, K; Ma, M; Colorado, R; J Keenan, K; Meisel, K; Hu, X;

Publication
Computing in Cardiology Conference (CinC) - 2018 Computing in Cardiology Conference (CinC)

Abstract

2018

AUTOMATIC METHODS FOR CAROTID CONTRAST-ENHANCED ULTRASOUND IMAGING QUANTIFICATION OF ADVENTITIAL VASA VASORUM

Authors
Pereira, T; Muguruza, J; Mária, V; Vilaprtnyo, E; Sorribas, A; Fernandez, E; Fernandez Armenteros, JM; Baena, JA; Rius, F; Betriu, A; Solsona, F; Alves, R;

Publication
ULTRASOUND IN MEDICINE AND BIOLOGY

Abstract

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