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Details

  • Name

    Paulo Teles
  • Cluster

    Computer Science
  • Role

    Senior Researcher
  • Since

    01st January 2014
Publications

2020

Self-Care Behavior Profiles With Arteriovenous Fistula in Hemodialysis Patients

Authors
Sousa, CN; Marujo, P; Teles, P; Lira, MN; Dias, VFF; Novais, MELM;

Publication
Clinical Nursing Research

Abstract

2019

Clustering of interval time series

Authors
Maharaj, EA; Teles, P; Brito, P;

Publication
Statistics and Computing

Abstract
Interval time series occur when real intervals of some variable of interest are registered as an ordered sequence along time. We address the problem of clustering interval time series (ITS), for which different approaches are proposed. First, clustering is performed based on point-to-point comparisons. Time-domain and wavelet features also serve as clustering variables in alternative approaches. Furthermore, autocorrelation matrix functions, gathering the autocorrelation and cross-correlation functions of the ITS upper and lower bounds, may be compared using adequate distances (e.g. the Frobenius distance) and used for clustering ITS. An improved procedure to determine the autocorrelation function of ITS is proposed, which also serves as a basis for clustering. The different alternative approaches are explored and their performances compared for ITS simulated under different setups. An application to sea level daily ranges, observed at different locations in Australia, illustrates the proposed methods. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

2018

The effect of temporal aggregation on the estimation accuracy of ARMA models

Authors
Teles, P; Sousa, PSA;

Publication
Communications in Statistics - Simulation and Computation

Abstract

2018

Radio-cephalic arteriovenous fistula recovered with drainage through the brachial vein

Authors
Norton de Matos, AN; Sousa, CN; Almeida, P; Teles, P; Rego, D; Teixeira, G; Loureiro, L; Teixeira, S;

Publication
HEMODIALYSIS INTERNATIONAL

Abstract
Dysfunction of arteriovenous access for hemodialysis is a challenge for the vascular surgeon. Some patients have complex vascular access with problems that are difficult to solve. Careful analysis of the vascular network with ultrasound and dissection of the veins during surgery can help to identify the best option for each access. We introduce and discuss the case of creation of a radio-cephalic fistula with outflow into the brachial vein in 64-year-old hemodialysis male patient. This technique enables extending fistula patency, arterializing the brachial vein, and improves cost efficiency.

2018

Radiocephalic Fistula Recovery Using the Brachial Vein and Forearm Basilic Vein: A Case Series and Literature Review

Authors
de Matos, AN; Sousa, CN; Almeida, P; Teles, P; Rego, D; Teixeira, G; Loureiro, L; Teixeira, S; Antunes, I;

Publication
THERAPEUTIC APHERESIS AND DIALYSIS

Abstract
Vascular access dysfunction is a serious problem in dialysis units. Some patients have complex dysfunctions that are difficult to resolve. In this article, we report the case a of two patients with radiocephalic arteriovenous fistulae (RC-AVF) who had stenosis/occlusion of the forearm median vein and where we used the basilic vein of the forearm as a solution. We reviewed the use of this surgical solution in RC-AVF. Two male patients on hemodialysis exhibited stenosis/occlusion of the forearm median vein. The forearm basilic vein was isolated and rotated toward the forearm median vein in order to solve RC-AVF problems. One patient had fistula thrombosis 5 months after the procedure, while for the other patient, the fistula continues to work without problems. Literature describes only a few cases using the forearm basilic vein or the brachial vein for fistula recovery. This procedure increased the patency of fistulas. This approach has been proven to be a good solution for solving outflow problems using the superficial or deep veins, increasing fistula patency and avoiding the need to place a central venous catheter and all the related complications.

Supervised
thesis

2019

Does the Derivative Usage, for Risk Management Purposes Change During a Financial Crisis? - Evidence from the U.K. electricity companies from 2006-2014

Author
Cláudia Letícia Gomez Fernandes

Institution
UP-FEP

2019

Market Sizing for "Reduced-Risk Products" in the Tobacco Industry

Author
Liliana Cristina Correia da Silva

Institution
UP-FEP

2018

A internacionalização de empresas tecnológicas a partir de Portugal – uma visão do Modelo do Tripé Estratégico

Author
Mário Jorge Castro Santos

Institution
UP-FEP

2018

Impacto da Economia Colaborativa no Turismo da Cidade do Porto - estudo caso Airbnb

Author
Francisco Teixeira Dias Ferreira Matos

Institution
UP-FEP

2018

Space impact on retailers’ performance – A study of a Portuguese grocery retailer

Author
Diogo Cardoso Campos

Institution
UP-FEP