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Details

  • Name

    Maria Rosário Ribeiro
  • Cluster

    Computer Science
  • Role

    Research Assistant
  • Since

    01st September 2018
Publications

2022

Planning and Optimization of Software-Defined and Virtualized IoT Gateway Deployment for Smart Campuses

Authors
Ferreira, D; Oliveira, JL; Santos, C; Filho, T; Ribeiro, M; Freitas, LA; Moreira, W; Oliveira, A;

Publication
SENSORS

Abstract
The Internet of Things (IoT) is based on objects or “things” that have the ability to communicate and transfer data. Due to the large number of connected objects and devices, there has been a rapid growth in the amount of data that are transferred over the Internet. To support this increase, the heterogeneity of devices and their geographical distributions, there is a need for IoT gateways that can cope with this demand. The SOFTWAY4IoT project, which was funded by the National Education and Research Network (RNP), has developed a software-defined and virtualized IoT gateway that supports multiple wireless communication technologies and fog/cloud environment integration. In this work, we propose a planning method that uses optimization models for the deployment of IoT gateways in smart campuses. The presented models aimed to quantify the minimum number of IoT gateways that is necessary to cover the desired area and their positions and to distribute IoT devices to the respective gateways. For this purpose, the communication technology range and the data link consumption were defined as the parameters for the optimization models. Three models are presented, which use LoRa, Wi-Fi, and BLE communication technologies. The gateway deployment problem was solved in two steps: first, the gateways were quantified using a linear programming model; second, the gateway positions and the distribution of IoT devices were calculated using the classical K-means clustering algorithm and the metaheuristic particle swarm optimization. Case studies and experiments were conducted at the Samambaia Campus of the Federal University of Goiás as an example. Finally, an analysis of the three models was performed, using metrics such as the silhouette coefficient. Non-parametric hypothesis tests were also applied to the performed experiments to verify that the proposed models did not produce results using the same population.

2022

Evolution of Heart Rate Complexity Indices in the Early Detection of Neonatal Sepsis

Authors
Ribeiro, M; Castro, L; Carrault, G; Pladys, P; Costa Santos, C; Henriques, T;

Publication
2022 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)

Abstract

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

The Entropy Universe

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

Publication
Proceedings of Entropy 2021: The Scientific Tool of the 21st Century

Abstract

2021

Complexity as cardiorespiratory coupling measure in neonates with different gestational ages

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

Publication
Proceedings of Entropy 2021: The Scientific Tool of the 21st Century

Abstract