Paula Oliveira
University of Trás-os-Montes and Alto Douro
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Publication
Featured researches published by Paula Oliveira.
Computers and Electronics in Agriculture | 2016
Paula Oliveira; João Paulo Moura; Luís Filipe Sanches Fernandes; Elza Maria Amaral; Ana Alexandra Oliveira
Vigor and vegetative expression are parameters of great interest in viticulture.Traditionally these parameters are estimated using a destructive method.We present a new method that determines these parameters based on an image.The method consists on a digital image processing of an on-field acquiring image. The vigor and the vegetative expression of vines are parameters of great interest in viticulture since they are indicative of the entire guidance system state. Traditionally these parameters are estimated and obtained using a destructive method by cutting the sticks, weighing them and finally obtain the medium weight of pruning sticks. This paper presents a non-destructive method that successfully determines the vine vigor based on a digital image processing. The method consists of acquiring a digital image of vines and applying a software to those images to determine vigor and vegetative expression. This application can be divided in two independent phases: the first one consists in a digital image processing, that isolate the vine sticks and determines the mean area per stick of the vine; the second one determines the vine vigor and vegetative expression based on a polynomial relationship between mean area and mean weight of stick. The software application was tested on thirty vines (Vitis vinifera cv. Touriga Nacional) characterized by low, medium and high vigor and selected during a three-year study. Since the mean weight of stick obtained using the mathematical expression and the values calculated using the real sticks present a 0.998 correlation, we can conclude that this new methodology successfully determines the vigor and the vegetative expression of vines. With this new methodology it is unnecessary determinate the pruning mass and the number of sticks per plant in the vineyard. Its a simple use application that determines vigor and vegetative expression, based on a digital image of the vine and independent of the pruning date. This new method has a patent register in Portugal, with the reference number 105163.
international conference on enterprise information systems | 2010
Vítor Mendonça; João Eduardo Quintela Alves Sousa Varajão; Paula Oliveira
Cooperation networks are a promising model for companies. There are currently several models for the creation of this kind of networks. This paper presents a conceptual model for the development of cooperation networks, which aims at promoting the information sharing about business opportunities between members of a specific network. The proposed model is based on a Web Information System, and it is useful in the context of building and managing inter-organizational and/or intra-organizational networks.
International Journal of Enterprise Information Systems | 2017
João Varajão; Maria da Glória Fraga; Paula Oliveira
Information Systems IS and Information Technologies IT are fundamental elements for the competitiveness of organizations. Thus, an efficient development of IT/IS projects is a key factor for business success. Nowadays companies are increasingly outsourcing their activities, including the development of IT/IS projects. However, the results of investments often lead to frustration and are far from meeting the expectations. Bearing this in mind, this paper proposes a new framework-ISOPM-that identifies the most relevant activities for the IT/IS outsourcing projects management, aiming to contribute to the study and development of this specific area of project management.
Journal of Food Engineering | 2011
Armando M. Fernandes; Paula Oliveira; João Paulo Moura; Ana Alexandra Oliveira; V. Falco; Maria José Correia; Pedro Melo-Pinto
Water and Environment Journal | 2013
Luís Filipe Sanches Fernandes; Maria João Marques; Paula Oliveira; João Paulo Moura
Area | 2012
Samantha Jane Hughes; Edna Cabecinha; João A. Santos; C. Andrade; Domingos Lopes; Henrique Manuel da Fonseca Trindade; João Alexandre Cabral; Mário Santos; José Manuel Martinho Lourenço; José Aranha; Luís Filipe Sanches Fernandes; Maria Manuela Morais; Maria Solange Mendonça Leite; Paula Oliveira; Rui Cortes
Archive | 2012
Samantha Jane Hughes; Edna Cabecinha; João A. Santos; C. Andrade; Domingos Lopes; Henrique Manuel da Fonseca Trindade; João Alexandre Cabral; Mário Santos; José Manuel Martinho Lourenço; José Aranha; Luís Filipe Sanches Fernandes; Maria Manuela Morais; Maria Solange Mendonça Leite; Paula Oliveira; Rui Cortes
Procedia Computer Science | 2015
Vítor Mendonça; João Varajão; Paula Oliveira
5ª Conferencia Ibérica de Sistemas y Tecnologías de Información | 2010
Vítor Mendonça; João Varajão; Paula Oliveira
OENO One | 2012
Paula Oliveira; Joao Paulo Moura; Maria José Correia; Luís Filipe Sanches Fernandes; Ana Alexandra Oliveira