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Details

  • Name

    Paulo Teles
  • Cluster

    Computer Science
  • Role

    Senior Researcher
  • Since

    01st January 2014
Publications

2023

Wavelet-based fuzzy clustering of interval time series

Authors
D'Urso, P; De Giovanni, L; Maharaj, EA; Brito, P; Teles, P;

Publication
INTERNATIONAL JOURNAL OF APPROXIMATE REASONING

Abstract
We investigate the fuzzy clustering of interval time series using wavelet variances and covariances; in particular, we use a fuzzy c-medoids clustering algorithm. Traditional hierarchical and non-hierarchical clustering methods lead to the identification of mutually exclusive clusters whereas fuzzy clustering methods enable the identification of overlapping clusters, implying that one or more series could belong to more than one cluster simultaneously. An interval time series (ITS) which arises when interval-valued observa-tions are recorded over time is able to capture the variability of values within each interval at each time point. This is in contrast to single-point information available in a classical time series. Our main contribution is that by combining wavelet analysis, interval data analysis and fuzzy clustering, we are able to capture information which would otherwise have not been contemplated by the use of traditional crisp clustering methods on classical time series for which just a single value is recorded at each time point. Through simulation studies, we show that under some circumstances fuzzy c-medoids clustering performs better when applied to ITS than when it is applied to the corresponding traditional time series. Applications to exchange rates ITS and sea-level ITS show that the fuzzy clustering method reveals different and more meaningful results than when applied to associated single-point time series.

2022

The COVID-19 Pandemic and Professional Nursing Practice in the Context of Hospitals

Authors
Ribeiro, OMPL; de Lima Trindade, L; Novo, AFMP; da Rocha, CG; Sousa, CN; Teles, PJFC; da Silva Reis, ACR; Perondi, AR; Andrigue, KCK; de Abreu Pereira, SC; da Silva Leite, PC; Ventura Silva, JMA;

Publication
Healthcare (Switzerland)

Abstract
The COVID-19 pandemic has imposed challenges to health systems and institutions, which had to quickly create conditions to meet the growing health needs of the population. Thus, this study aimed to assess the impact of COVID-19 on professional nursing practice environments and to identify the variables that affected their quality. Quantitative, observational study, conducted in 16 Portuguese hospitals, with 1575 nurses. Data were collected using a questionnaire and participants responded to two different moments in time: the pre-pandemic period and after the fourth critical period of COVID-19. The pandemic had a positive impact on the Structure and Outcome components, and a negative trend in the Process component. The variables associated with the qualification of the components and their dimensions were predominantly: work context, the exercise of functions in areas of assistance to COVID-19 patients, length of professional experience and length of experience in the service. The investment in professional practice environments impacted the improvement of organizational factors, supporting the development of nurses’ work towards the quality of care. However, it is necessary to invest in nurses’ participation, involvement and professional qualifications, which are aspects strongly dependent on the institutions’ management strategies.

2022

Empirical Evidence of Associations and Similarities between the National Equity Markets Indexes and Crude Oil Prices in the International Market

Authors
Salles, AAd; Silva, ME; Teles, P;

Publication
Open Journal of Business and Management

Abstract

2022

Adaptation and Validation of the Individual Lifestyle Profile Scale of Portuguese Older Adults Living at Home

Authors
Faria, ADA; Martins, MM; Ribeiro, OMPL; Ventura-Silva, JMA; Teles, PJFC; Laredo-Aguilera, JA;

Publication
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH

Abstract
(1) Background: Unadjusted lifestyles have been the main cause of risk for the loss of years of healthy life. However, currently valid and reliable instruments to assess the lifestyles of the elderly are quite long and difficult to interpret. For this reason, the objective of this study was to adapt and validate the 'Individual Lifestyle Profile' (ILP) scale in a sample of elderly people; (2) Methods: A methodological study was carried out and a sample of 300 older adults enrolled in a Health Unit located in the North of Portugal was used, who responded to the scale. We examined internal consistency, predictive validity, and discriminative ability; (3) Results: After the Exploratory Factorial analysis, a solution was found with four factors that explain a variance of 67.8%. The designation of the factors was changed from the original scale, with the exception of one dimension, and they were called Health Self-management, Social Participation and Group Interaction, Citizenship and Physical Activity. The total internal consistency (Cronbach's alpha) was 0.858, ranging from 0.666 to 0.860 in the mentioned factors; (4) Conclusions: The ILP scale proved to be easy to apply and presented a good reliability and validity index, based on internal consistency, AFE and AFC. The scale allows evaluating the lifestyle of older adults, and its use will be aimed at modifying behaviors associated with negative lifestyles of older adults and their individual needs.

2022

From Health Literacy to Self-Care: Contributions of the Specialist Nurse in Rehabilitation Nursing

Authors
Dias, MDJ; Faria, ADA; Ferreira, MSM; Faleiros, F; Novo, A; Goncalves, MN; da Rocha, CG; Teles, PJFC; Ribeiro, MP; da Silva, JMAV; Ribeiro, OMPL;

Publication
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH

Abstract
(1) Background: Initiatives aimed at assessing and intervening in health literacy have the potential to promote adherence to self-care behaviours, which is the main focus of intervention by rehabilitation nurses. Thus, the objectives were to analyse the level of health literacy of working-age citizens and identify priority areas for intervention by rehabilitation nurses. (2) Methods: Quantitative, correlational and cross-sectional study, conducted in a multinational company, with the participation of 161 workers. The data were collected between 14 April and 7 May 2021, using a self-completion questionnaire composed of sociodemographic and clinical characterization and the European Health Literacy Survey, following a favourable opinion from the Ethics Committee and the company’s management. (3) Results: Overall, low to moderate literacy scores were predominant. Age and education were significantly associated with literacy scores. Workers with higher levels of health literacy had no diagnosed illnesses, took less medication, reported less sadness, fewer memory changes and less muscle and joint pain. (4) Conclusions: The fact that higher levels of health literacy trigger self-care behaviours and, consequently, fewer health problems reinforces the need for rehabilitation nurses to invest in this area.

Supervised
thesis

2022

Internacionalização das PME’s portuguesas do setor têxtil: uma abordagem na perspetiva do tripé estratégico e do cluster industrial

Author
Marta Sofia Pinheiro Carneiro

Institution
UP-FEP

2022

O perfil das empresas portuguesas internacionalizadas no setor do vestuário - análise da propensão e intensidade exportadora

Author
Alexandra Sousa Pinto

Institution
UP-FEP

2022

Determinantes da performance exportadora das empresas portuguesas do setor vitivinícola

Author
Ana Luísa Barbosa Moreira Torres

Institution
UP-FEP

2022

Os determinantes da exportação das empresas do setor mobiliário em Portugal

Author
Mariana da Costa Lopes de Carvalho

Institution
UP-FEP

2021

Internationalization Of Portuguese SMEs to Japan: A Focus On Export Barriers

Author
Roberto Manuel Soares Vieira Konagaya Martins

Institution
UP-FEP