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Publications

2017

Fleet and revenue management in car rental companies: A literature review and an integrated conceptual framework

Authors
Oliveira, BB; Carravilla, MA; Oliveira, JF;

Publication
OMEGA-INTERNATIONAL JOURNAL OF MANAGEMENT SCIENCE

Abstract
This paper aims to present, define and structure the car rental fleet management problem, which includes operational fleet management issues and problems traditionally studied under the revenue management framework. The car rental business has challenging and distinctive characteristics, which are mainly related with fleet and decision-making flexibility, and that render this problem relevant for academic research and practical applications. Three main contributions are presented: an in-depth literature review and discussion on car rental fleet and revenue management issues, a novel integrating conceptual framework for this problem, and the identification of research directions for the future development of the field.

2017

Continuous Ambulatory Peritoneal Dialysis: Business Intelligence applied to patient monitoring CAPD study and statistics

Authors
Peixoto, C; Brito, C; Fontainhas, M; Peixoto, H; Machado, J; Abelha, A;

Publication
2017 5TH INTERNATIONAL CONFERENCE ON FUTURE INTERNET OF THINGS AND CLOUD WORKSHOPS (FICLOUDW) 2017

Abstract
Continuous Ambulatory Peritoneal Dialysis (CAPD) is one of the many treatments for patients with advanced kidney disease. It is a treatment that needs regular monitoring and understanding of all the factors of blood and urine samples of each patient to understand if the treatment is going well. This article will explore data information from patients undergoing CAPD procedure. This data information helps to comprehend how interoperability acts in a Health Information System since this data contains patients' personal information but also patients' blood and urine samples' results, meaning all the services must be connected. In this work, it is used Business Intelligence process to prove that all the information available can be useful to understand the treatment above-mentioned and also how can several factors influence or not the number of patients going through kidney failure and CAPD by the study of indicators.

2017

Unmanned Maritime Systems for Search and Rescue

Authors
Matos, A; Silva, E; Almeida, J; Martins, A; Ferreira, H; Ferreira, B; Alves, J; Dias, A; Fioravanti, S; Bertin, D; Lobo, V;

Publication
Search and Rescue Robotics - From Theory to Practice

Abstract

2017

Effect of Risk Aversion on Reserve Procurement With Flexible Demand Side Resources From the ISO Point of View

Authors
Paterakis, NG; Sanchez de la Nieta, AAS; Bakirtzis, AG; Contreras, J; Catalao, JPS;

Publication
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY

Abstract
In this study, a two-stage stochastic programming joint day-ahead energy and reserve scheduling model to address uncertainty in wind power generation is developed. Apart from the generation side, the demand side is also eligible as a reserve resource and is modeled through responsive load aggregations, as well as large industrial loads that directly participate in the scheduling procedure. The main contribution of this paper is the inclusion of a risk metric, namely the conditional value-at-risk, which renders a conceptually different resource scheduling framework. The proposed model is employed in order to analyze the behavior of energy and reserve scheduling by both generation and demand for a risk-averse independent system operator. To reach practical conclusions, the proposed methodology is tested on the real non-interconnected insular power system of Crete, Greece, which is characterized by a significant penetration of wind power generation.

2017

Self-concept, Aggressiveness and Perfectionism Among Military Personnel

Authors
Vasconcelos Raposo, J; Pinheiro, E; Pereira, S; Arbinaga, F; Teixeira, CM;

Publication
PSIENCIA-REVISTA LATINOAMERICANA DE CIENCIA PSICOLOGICA

Abstract
This research pretends to understand the profile of the young Portuguese army in levels of Aggressiveness, Perfectionism and Self-concept, according to comparative analyze by gender and military rank. The sample consisted of 183 soldiers, aged between 18 and 35 years, which are 18 female and 165 male. The study variables were evaluated by applying three instruments, respectively, Multidimensional Scale of Perfectionism, Aggression Questionnaire and Self-Concept Clinical Inventory. The main results show that elevated levels of general Perfectionism and general Self-concept, as moderate levels of general Aggressiveness, characterize the overall profile of the young military. The comparative gender analysis showed that there are significant differences in the results regarding levels of aggression only. On the other hand the comparative analysis of military ranks indicates the existence of significant differences in levels of self-concept and aggression. Finally, the correlation analysis shows that aggressiveness correlates negatively with self-concept and positively with perfectionism.

2017

Forecasting bivalve landings with multiple regression and data mining techniques: The case of the Portuguese Artisanal Dredge Fleet

Authors
Oliveira, MM; Camanho, AS; Walden, JB; Migueis, VL; Ferreira, NB; Gaspar, MB;

Publication
MARINE POLICY

Abstract
This paper develops a decision support tool that can help fishery authorities to forecast bivalve landings for the dredge fleet accounting for several contextual conditions. These include weather conditions, phytotoxins episodes, stock-biomass indicators per species and tourism levels. Vessel characteristics and fishing effort are also taken into account for the estimation of landings. The relationship between these factors and monthly quantities landed per vessel is explored using multiple linear regression models and data mining techniques (random forests, support vector machines and neural networks). The models are specified for different regions in the Portugal mainland (Northwest, Southwest and South) using six years of data 2010-2015). Results showed that the impact of the contextual factors varies between regions and also depends on the vessels target species. The data mining techniques, namely the random forests, proved to be a robust decision support tool in this context, outperforming the predictive performance of the most popular technique used in this context, i.e. linear regression.

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