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Gonçalo J. M. Rosa, João M. S. Afonso, Pedro D. Gaspar, Vasco N. G. J. Soares and João M. L. P. Caldeira
Pedestrian crossings are an essential part of the urban landscape, providing safe passage for pedestrians to cross busy streets. While some are regulated by timed signals and are marked with signs and lights, others are simply marked on the road and do n...
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Joaquim Miguel, Pedro Mendonça, Agnelo Quelhas, João M. L. P. Caldeira and Vasco N. G. J. Soares
Hiking and cycling have become popular activities for promoting well-being and physical activity. Portugal has been investing in hiking and cycling trail infrastructures to boost sustainable tourism. However, the lack of reliable data on the use of these...
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Hermenegildo Gomes, Francisco Navio, Pedro D. Gaspar, Vasco N. G. J. Soares and João M. L. P. Caldeira
In recent years, radio-frequency identification (RFID) has aroused significant interest from industry and academia. This demand comes from the technology?s evolution, marked by a reduction in size, cost, and enhanced efficiency, making it increasingly ac...
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Alexandre F. Santos, Pedro D. Gaspar, Heraldo J. L. de Souza, João M. L. P. Caldeira and Vasco N. G. J. Soares
This study discusses the choice of dehumidification systems for high-moisture indoor environments, such as indoor swimming pools, supported by an eco-energetic performance comparison. Initially, the causes of the high relative humidity and condensation i...
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Khadijeh Alibabaei, Eduardo Assunção, Pedro D. Gaspar, Vasco N. G. J. Soares and João M. L. P. Caldeira
The concept of the Internet of Things (IoT) in agriculture is associated with the use of high-tech devices such as robots and sensors that are interconnected to assess or monitor conditions on a particular plot of land and then deploy the various factors...
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Eduardo Assunção, Pedro D. Gaspar, Khadijeh Alibabaei, Maria P. Simões, Hugo Proença, Vasco N. G. J. Soares and João M. L. P. Caldeira
Within the scope of precision agriculture, many applications have been developed to support decision making and yield enhancement. Fruit detection has attracted considerable attention from researchers, and it can be used offline. In contrast, some applic...
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Miguel Valente, Hélio Silva, João M. L. P. Caldeira, Vasco N. G. J. Soares and Pedro D. Gaspar
This work is a part of an ongoing study to substitute the identification of waste containers via radio-frequency identification. The purpose of this paper is to propose a method of identification based on computer vision that performs detection using ima...
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Victor Gomes Lauriano Souza, João Ricardo Afonso Pires, Carolina Rodrigues, Patricia Freitas Rodrigues, Andréia Lopes, Rui Jorge Silva, Jorge Caldeira, Maria Paula Duarte, Francisco Braz Fernandes, Isabel Maria Coelhoso and Ana Luisa Fernando
Novel bionanocomposite films of chitosan/montmorillonite (CS/MMT) activated with ginger essential oil (GEO) were produced and characterized in terms of their physical and morphological properties. The homogenization process led to a good interaction betw...
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Claudio Samanez Bisso,João Frois Caldeira,Carlos Patricio Samanez,Gheisa Roberta Telles Esteves
Pág. 323 - 352
This paper applies the method known as data envelopment analysis (DEA) to acess the performance of investment funds in Brazil during the period 2012-2014, evaluating a representative sample that is framed in the "Free Shares" category. The results show e...
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Paulo Ferreira Naibert,João Caldeira
Pág. 504 - 543
In this paper, we study the problem of minimum variance portfolio selection based on a recent methodology for portfolio optimization restricting the allocation vector proposed by Fan et al. (2012). To achieve this, we consider different conditional and u...
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