Gonçalo Jacinto

Universidade de Évora | uevora · Department of Mathematics

Evaluation plays a pivotal role in transdisciplinary (TD) research, often discussed during funding stages or when assessing project impacts. A few studies delve into the participant perspective when examining the quality of transdisciplinarity. Our work contributes to this area of assessment. Rather than providing a definitive definition of transdi...

Background. The mental health of university students has worsened over time, and it is young people who have suffered the most from the COVID-19 pandemic in terms of mental health. Anxiety and depression are the most common symptoms reported by university students and are often the cause of disabilities, either in academic performance or in other s...

We used a class of stochastic differential equations (SDE) to model the evolution of cattle weight that, by an appropriate transformation of the weight, resulted in a variant of the Ornstein-Uhlenbeck model. In previous works, we have dealt with estimation, prediction, and optimization issues for this class of models. However, to incorporate indivi...

In early work we have studied a class of stochastic differential equation (SDE) models, for which the Gompertz and the Bertalanffy-Richards stochastic models are particular cases, to describe individual growth in random environments, and applied it to model cattle weight evolution using real data. We have started to work on these type of models con...

Road Traffic Accidents (RTA) cause human losses and irreparable physical and psychological damage to many of the victims. They also involve a very relevant economic dimension. It is urgent to improve the management of human and material resources for more effective prevention. This work makes an important contribution by presenting a methodology th...

Road traffic accidents are a major concern for modern society with a high toll on human life and involve hard to account economic consequences. New knowledge can be obtained from combining GIS tools with machine learning and artificial intelligence, developing what is, in this work, identified as spatial intelligence. This approach is tested in a c...

Road traffic accidents (RTAs) are a problem with repercussions in several dimensions: social, economic, health, justice, and security. Data science plays an important role in its explanation and prediction. One of the main objectives of RTA data analysis is to identify the main factors associated with a RTA. The present study aims to contribute to...

Road Traffic Accidents (RTA) are one of the greatest calamities of our time, due to the human losses and to the irreparable physical and psychological damage they cause to several victims, also involving a very relevant economic dimension. To scientifically support the study of the problem of serious RTA in Setúbal, the University of Évora establis...

In Portugal, the district of Setúbal is among those with the higher number of road accidents with fatal injuries but with fewer accidents. This work analyzes data from road accidents that occurred in the area under the jurisdiction of the Territorial Command of Setúbal, belonging to the Guarda Nacional Republicana, the Portuguese Gendarmerie. A spa...

We apply a class of stochastic differential equations to model the growth of individual animals in randomly fluctuating environments using real weight data of males of the Mertolengo cattle breed. The use of these more realistic models can help farmers to optimize their profit. To this end we obtain the probability distribution, the first two momen...

Sleep disorders have significant health impacts and affect children’s performance and wellbeing. This study aims to characterise the sleep habits of Portuguese primary school children considering socioeconomic factors, daily lifestyle, presence of electronic devices in the bedrooms, and the practice of physical and sports activity (PSA) and to iden...

We apply a class of stochastic differential equations to model individual growth in a randomly fluctuating environment using cattle weight data. We have used maximum likelihood theory to estimate the parameters. However, for cattle data, it is often not feasible to obtain animal's observations at equally spaced ages nor even at the same ages for di...

Portugal has the sixth highest road fatality rate among European Union members. This is a problem of different dimensions with serious consequences in people’s lives. This study analyses daily data from police and government authorities on road traffic accidents that occurred between 2016 and 2019 in a district of Portugal. This paper looks for the...

Stochastic differential equations (SDE) appropriately describe a variety of phenomena occurring in random environments, such as the growth dynamics of individual animals. Using appropriate weight transformations and a variant of the Ornstein–Uhlenbeck model, one obtains a general model for the evolution of cattle weight. The model parameters are α,...

A raça mertolenga é caracterizada por ser uma raça pequena, enérgica, melhorada para ser usada, principalmente para tração e autóctone da região do Alentejo (Portugal). Os animais em estudo foram desmamados entre 6 a 8 meses de idade e a Associação de Produtores de Bovino da raça Mertolenga (ACBM) realizou as fases de recria e acabamento destes ani...

One hundred and ten years after the birth of David Riesman (1909–2002), and almost 70 after the publication of The Lonely Crowd (1950), this chapter revisits the main contributions of such a work for a current reading of youth in a networked society. Anchored on data collected from a representative sample of students in secondary schools in Évora,...

bold> Background: About 1/5 of the population of Évora Municipality in Portugal is aged 65 and over, and there has been a continued deterioration in the ageing index (159 in 2016). Évora City Hall offers the Active Seniors program which aims to promote physical activity and healthy lifestyles among older adults (at least 55 years). This study aims...

A generalização do recurso a questionários disponíveis on-line parece facilitada pela difusão de plataformas especificamente desenvolvidas para o efeito, assim como pela cada vez maior utilização de dispositivos tecnológicos por parte da população. Se do lado dos inquiridos estes dispositivos permitem um acesso e preenchimento facilitado do instrum...

We use a probing strategy to estimate the time dependent traffic intensity in an Mt/Gt/1 queue, where the arrival rate and the general service-time distribution change from one time interval to another, and derive statistical properties of the proposed estimator. We present a method to detect a switch from a stationary interval to another using a s...

In this paper, we derive the probability distribution of the number of hops required for a source node to reach a destination node in a two-dimensional mobile ad hoc network when a fixed number of nodes are uniformly distributed in a finite region under the nearest- and furthestdistance routing protocols. To achieve efficient progress towards the d...

O tempo até conclusão dos cursos superiores assume uma particular importância, pois tem impacto na projeção da Universidade para o exterior. Neste trabalho, com base nos dados recolhidos pelos Serviços Académicos da Universidade de Évora, pretende-se estudar o tempo até conclusão de uma dissertação de Mestrado. Recorrendo à análise de sobrevivência...

Item response theory (IRT) provides statistical models that relate an examinee’s response to a test item to an underlying latent trait that is measured by the items. Unlike classical test theory, IRT models focus on the responses to individual questions instead on the total score obtained in the test. In this paper we apply IRT models to the result...

A Mobile Ad Hoc Network (MANET) is characterized to be a network with free, cooperative, and dynamic nodes, self-organized in a random topology, without any kind of infrastructure, where the communication between two nodes usually occurs using multihop paths. The number of hops used in the multihop path is an important metric for the design and per...

We consider the estimation of the arrival rate and the service time moments of a M/G/1 queue with probing, i.e., with special customers (probes) entering the system. The probe inter-arrival times are i.i.d. and probe service times follow a general positive distribution. The only observations used are the arrival times, service times and departure t...

Desenvolvimentos recentes nas metodologias de monitorização de morcegos utilizadas em Portugal, especialmente a introdção de estações de gravação automáticas, conduziram a um problema de análise devido à quantidade de dados obtida. Face a este problema propomos desenvolver um método automatizado de análise e classificação de pulsos de ecolocalizaçã...

The temporal lobe epilepsy (TLE) is the most common type of refractory epilepsy in adults. There is a wide consensus regarding the commitment of memory in temporal lobe epilepsy with hippocampal sclerosis. However, the consensus is not as widespread with respect to the other functions such as attention, executive functions, language and intellectua...

Mobile ad hoc networks are characterized by having nodes that are cooperative and communicate without any kind of infrastructure. The mobility and multihop capability of these networks lead the network topology to change rapidly and unpredictably; this aspect must be incorporated in effective models to describe the dynamics of multihop paths.When m...

Due to complexity and intractability reasons, most of the analytical studies on the reliability of communication paths in mobile ad hoc networks are based on the assumption of link independence. In this paper, an analytical framework is developed to characterize the random behavior of a multihop path and derive path metrics to characterize the reli...

Numerical inversion of cumulative infiltration data during transient water flow, complemented with initial (?i) and final water content data (?f) of the infiltration process, is a new tool to define soil water retention ? (h) and hydraulic conductivity K(h) curves and to estimate the unknown parameters in Mualem-Van Genuchten`s model (M-vG) of the...

This paper investigates connectivity in one-dimensional ad hoc networks by means of the distribution of the minimum hop count between source and destination nodes. We derive the exact probability distribution of the minimum hop count from the location density of relay nodes in the multihop path selected with the Most Forward within Radius (MFR) sch...

Resumo: Para suportar as características de teletráfego das redes sem os multimé-dia são necessárias predições a curto prazo e medidas de controlo da rede, de forma a garantir a qualidade de serviço exigida pelo operador móvel. Jacinto, Pacheco e Antunes (2004) propuseram um algoritmo adaptativo de partilha de largura de banda para lidar com o prob...