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Details

  • Name

    Luís Filipe Antunes
  • Cluster

    Computer Science
  • Role

    Centre Coordinator
  • Since

    15th December 2011
006
Publications

2021

The Entropy Universe

Authors
Ribeiro, M; Henriques, T; Castro, L; Souto, A; Antunes, L; Costa Santos, C; Teixeira, A;

Publication
Entropy

Abstract
About 160 years ago, the concept of entropy was introduced in thermodynamics by Rudolf Clausius. Since then, it has been continually extended, interpreted, and applied by researchers in many scientific fields, such as general physics, information theory, chaos theory, data mining, and mathematical linguistics. This paper presents The Entropy Universe, which aims to review the many variants of entropies applied to time-series. The purpose is to answer research questions such as: How did each entropy emerge? What is the mathematical definition of each variant of entropy? How are entropies related to each other? What are the most applied scientific fields for each entropy? We describe in-depth the relationship between the most applied entropies in time-series for different scientific fields, establishing bases for researchers to properly choose the variant of entropy most suitable for their data. The number of citations over the past sixteen years of each paper proposing a new entropy was also accessed. The Shannon/differential, the Tsallis, the sample, the permutation, and the approximate entropies were the most cited ones. Based on the ten research areas with the most significant number of records obtained in the Web of Science and Scopus, the areas in which the entropies are more applied are computer science, physics, mathematics, and engineering. The universe of entropies is growing each day, either due to the introducing new variants either due to novel applications. Knowing each entropy’s strengths and of limitations is essential to ensure the proper improvement of this research field.

2021

Privacy Technologies and Policy - 9th Annual Privacy Forum, APF 2021, Oslo, Norway, June 17-18, 2021, Proceedings

Authors
Gruschka, N; Coelho Antunes, LF; Rannenberg, K; Drogkaris, P;

Publication
APF

Abstract

2020

Profiling IT security and interoperability in Brazilian health organisations from a business perspective

Authors
Rui, RJ; Martinho, R; Oliveira, AA; Alves, D; Nogueira Reis, ZSN; Santos Pereira, C; Correia, ME; Antunes, LF; Cruz Correia, RJ;

Publication
International Journal of E-Health and Medical Communications

Abstract
The proliferation of electronic health (e-Health) initiatives in Brazil over the last 2 decades has resulted in a considerable fragmentation within health information technology (IT), with a strong political interference. The problem regarding this issue became twofold: 1) there are considerable flaws regarding interoperability and security involving patient data; and 2) it is difficult even for an experienced company to enter the Brazilian health IT market. In this article, the authors aim to assess the current state of IT interoperability and security in hospitals in Brazil and evaluate the best business strategy for an IT company to enter this difficult but very promising health IT market. A face-to-face questionnaire was conducted among 11 hospital units to assess their current status regarding IT interoperability and security aspects. Global Brazilian socio-economic data was also collected, and helped to not only identify areas of investment regarding health IT security and interoperability, but also to derive a business strategy, composed out of recommendations listed in the paper. Copyright © 2020, IGI Global.

2020

Nonlinear Methods Most Applied to Heart-Rate Time Series: A Review

Authors
Henriques, T; Ribeiro, M; Teixeira, A; Castro, L; Antunes, L; Costa Santos, C;

Publication
Entropy

Abstract
The heart-rate dynamics are one of the most analyzed physiological interactions. Many mathematical methods were proposed to evaluate heart-rate variability. These methods have been successfully applied in research to expand knowledge concerning the cardiovascular dynamics in healthy as well as in pathological conditions. Notwithstanding, they are still far from clinical practice. In this paper, we aim to review the nonlinear methods most used to assess heart-rate dynamics. We focused on methods based on concepts of chaos, fractality, and complexity: Poincaré plot, recurrence plot analysis, fractal dimension (and the correlation dimension), detrended fluctuation analysis, Hurst exponent, Lyapunov exponent entropies (Shannon, conditional, approximate, sample entropy, and multiscale entropy), and symbolic dynamics. We present the description of the methods along with their most notable applications.

2020

Empowering Users Through a Privacy Middleware Watchdog

Authors
Sousa, PR; Martins, R; Antunes, L;

Publication
Trust, Privacy and Security in Digital Business - Lecture Notes in Computer Science

Abstract

Supervised
thesis

2020

Security Enhancing Technologies for Cloud-of-Clouds

Author
João Miguel Maia Soares de Resende

Institution
UP-FCUP

2020

Nonlinear Analysis Methods in Physiological Signals

Author
Maria do Rosário Campos Ribeiro

Institution
UP-FCUP

2020

Automated standard based security assessment for IoT

Author
André Nuno de Pinho Tavares Gurgo e Cirne

Institution
UP-FCUP

2020

Privacy Framework

Author
Miguel Azevedo de Sousa

Institution
UP-FCUP

2020

Deteção e Alerta de Vulnerabilidades e Exposições Comuns (CVE)

Author
Luís Ricardo Pereira Passos

Institution
UP-FCUP