2020
Authors
Pinto, A; Silva, J;
Publication
Blockchain and Applications - 2nd International Congress, BLOCKCHAIN 2020, L'Aquila, Italy, 17-19 June, 2020.
Abstract
Notary services have long been identified as a recurrent example for dematerialisation through blockchain adoption, but has failed to become a world wide reality. The key issue being the distinct legal frameworks throughout the world. Europe in this context has a more restrictive legal context with regard to blockchain use. In this work, we briefly discuss the European role of the Notary, review the existing European solutions and identify related open issues that are not resolved in the existing solutions. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020.
2020
Authors
Prieto, J; Pinto, A; Das, AK; Ferretti, S;
Publication
Advances in Intelligent Systems and Computing
Abstract
2020
Authors
Prieto, J; Das, AK; Ferretti, S; Pinto, A; Corchado, JM;
Publication
Advances in Intelligent Systems and Computing
Abstract
2020
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: Poincare 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
Authors
Queiroz, S; Vilela, JP; Monteiro, E;
Publication
IEEE ACCESS
Abstract
In this work, we present an optimal mapper for OFDM with index modulation (OFDM-IM). By optimal we mean the mapper achieves the lowest possible asymptotic computational complexity (CC) when the spectral efficiency (SE) gain over OFDM maximizes. We propose the spectro-computational (SC) analysis to capture the trade-off between CC and SE and to demonstrate that an -subcarrier OFDM-IM mapper must run in exact time complexity. We show that an OFDM-IM mapper running faster than such complexity cannot reach the maximal SE whereas one running slower nullifies the mapping throughput for arbitrarily large . We demonstrate our theoretical findings by implementing an open-source library that supports all DSP steps to map/demap an-subcarrier complex frequency-domain OFDM-IM symbol. Our implementation supports different index selector algorithms and is the first to enable the SE maximization while preserving the same time and space asymptotic complexities of the classic OFDM mapper.
2020
Authors
Mendes, R; Cunha, M; Vilela, JP;
Publication
Proceedings on Privacy Enhancing Technologies
Abstract
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