NOVA Information Management School

Campolide, Portugal

NOVA Information Management School

Campolide, Portugal
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Rui M.,NOVA Information Management School | Pedro C.,NOVA Information Management School | Roberto H.,NOVA Information Management School
Iberian Conference on Information Systems and Technologies, CISTI | Year: 2017

Globalization brought a set of factors that led to the promotion of some geographical areas strategic to the growth and evolution of the global financial, economic and commercial systems. The study of Global Cities emerged as a key concept to identify and characterize cities as main agents in the performance of the world economy, i.e., World Cities (WC). There is consensus on how to identify market leader cities worldwide. Nevertheless, the classification criteria has been proven a difficult task. Similarly, there is criticism on the results obtained with these studies, especially due to the scarcity of data, compromising many published results. Missing data along consequent years justifies the lack of scientific publications about the evolution of World City Networks. Recent researches are also associated to 'lack of data'. This paper identifies these problems as the '7 deadly sins' of World Cities, and examines how these deficiencies may be corrected using a unique air traffic dataset, the POAT (Public Online Air Traffic) data. This research should propel the study of World Cities to more reliable and undisputed results through the use of sophisticated data analysis techniques. © 2017 AISTI.


Evans A.M.,NOVA Information Management School | Gomes R.G.,NOVA Information Management School
Proceedings of the European Conference on e-Government, ECEG | Year: 2017

The goal of this work is to analyze the role of digital literacy in citizens' adoption of electronic public services. The study is driven by the following puzzle: notwithstanding intense policy efforts over the past two decades to secure universal supply of information technologies (IT) at the school level, as well as universal broadband coverage at low cost for households, current statistics reveal striking disparities in the use of digital public services in Portugal. As noticed by existing studies, inequalities in access or use of online public services have negative social consequences, namely the exclusion of parts of the population from key opportunities for self- and collective- development. It is therefore important to understand the factors that affect citizen engagement in online exchange of information with public authorities. Existing research suggests that education and age are determinant factors of individual online engagement. However, aggregate scores tells us very little about what can be done to correct imbalances and steer digital inclusion. Thus, our study will examine levels of internet interaction between citizens and public authorities looking at sub-categories in age and education cohorts, in order to establish a set of preliminary hypotheses on the factors that influence disparities in individual engagement in digital public services. The findings will contribute to expand knowledge on how to adequately align policy towards effective interaction between private users and public providers, which will be critical for improving governance and reducing inequalities. © The Authors, 2017.


Cruz-Jesus F.,NOVA Information Management School | Oliveira T.,NOVA Information Management School | Bacao F.,NOVA Information Management School | Irani Z.,Brunel University
Information Systems Frontiers | Year: 2017

This paper analyzes the digital development of 110 countries and its relationship with economic development. Using factor analysis, we combined seven ICT-related variables into a single measure of digital development. This measure was then used as the dependent variable in an OLS model that allows non-linear effects, with the GDP per capita of countries as the explanatory variable. Our findings are substantive in that the correlation between economic and digital development was found to be not linear, being much stronger in poorer countries, a finding not commonly seen in the literature. As a result, future studies that focus on the relationship between economic and digital developments may benefit from our findings, by postulating this type of relationship. In our model we were able to explain 83 % of the variation in the digital development of countries, compared to just 72 % if considering only a linear relationship. © 2016, Springer Science+Business Media New York.


Sarmento P.,NOVA Information Management School | Sarmento P.,Polytechnic Institute of Coimbra | Fonte C.C.,Polytechnic Institute of Coimbra | Fonte C.C.,University of Coimbra | And 3 more authors.
International Journal of Remote Sensing | Year: 2015

The accuracy assessment of land-cover maps requires reference databases which are intended to represent ground truth. However, these reference databases are usually obtained through photo-interpretation of aerial or very-high-resolution satellite images and therefore have uncertainty which will influence the results of the accuracy assessment. Previous efforts to account for this source of uncertainty have employed a linguistic scale to translate the degree of correspondence between the ground conditions and each land-cover class for each sample location. The linguistic scale is transformed into fuzzy intervals with this transformation based on a photo-interpreter’s hypothetical ideal perception of the land-cover areal coverage for a sample unit. The end result is a fuzzy accuracy assessment. The objectives of this article are to assess the degree to which the real response of photo-interpreters corresponds to the assumed ideal response and to evaluate the impact these differences have on the results of an accuracy assessment. To achieve this objective, we examine linguistic scales with five and seven values. Furthermore, we develop a method to transform these scales into interpreter-derived fuzzy intervals expressing the proportion of area of land cover for each sample unit. This transformation is accomplished using a control sample in which the area occupied by each land-cover class is assessed. The methodology is tested via a case study where a map with five land-cover classes is evaluated. The accuracy assessment is performed with both hypothetical ideal interpreter response and with the interpreter-derived fuzzy intervals. The results for the fuzzy accuracy measures produced from the different analyses show that there are considerable differences between the results obtained with the linguistic scale with five and seven values, and that the interpreter-derived seven-value linguistic scale provides results very similar to those obtained with the ideal interpreter response. © 2015 Taylor & Francis.


Martins R.,NOVA Information Management School | Oliveira T.,NOVA Information Management School | Thomas M.A.,Virginia Commonwealth University
Journal of Organizational Computing and Electronic Commerce | Year: 2015

The information systems outsourcing (ISO) field continues to grow, as organizations consistently seek improvements in IT activities. The global scope of outsourcing participation and growth leads to gaps of knowledge related to the contextual factors that influence ISO adoption. Using the technology-organization-environment (TOE) framework, this study identifies and contextualizes the determinants of ISO adoption. Data collected from 261 firms suggest that relative advantage, firm size, top management support, and competitive pressure are the main determinants of ISO. This study highlights the importance of assessing ISO using the TOE theoretical lens, and offers replication of prior results, the lack of which is a growing concern in social science research. © Taylor & Francis Group, LLC.


Santos S.,NOVA Information Management School | Cabral P.,NOVA Information Management School | Zamyatin A.,Tomsk State University
International Journal of Agricultural and Environmental Information Systems | Year: 2015

In this study, land use and cover changes in continental Portugal are analyzed for years 1980,1995 and 2010 using samples of the Landyn research project. The modeling approach includes testing the hypothesis that land cover changes are generated by a frst-order Markov process. Results show that the changes in land use and cover are dependent of the previous moment in time, i. e., they follow a Markov process. Accordingly multi-decadal land cover projections of Landyn simplif ed land cover classes are legitimately presented and analyzed for continental Portugal and its regions for years 2020, 2030 and 2040. To make these results spatially explicit, a modelling approach which combines Markov chains with cellular automata is carried out using hypothetical scenarios. The quantitative and spatially explicit information provided by this study enables a better understanding oftendencies in land cover change and may be useful for territorial planning and management. Copyright © 2015, IGI Global.


Nhabomba A.B.P.,Nova Information Management School | Dos Santos V.D.,Nova Information Management School
Iberian Conference on Information Systems and Technologies, CISTI | Year: 2016

The literature already established has shown the importance of information systems and technologies for becoming increasingly a factor that currently differentiates successful organizations, augmenting, increasingly, the dependence of the organizations on assistance provided by these resources. Its impact is very significant in organizations where the final product is information, such as the National Statistical Institutes, whose mission is to produce and disseminate official statistical information of general interest of a country. It is believed that using the systems and information technology most problems would be minimally resolved and that would also considerable productivity gains. Found, however, dissatisfaction for results, in most cases, due to poor standardization of technology, poor alignment between existing information systems within the enterprise and business processes, leading organizations to lose their productive capacity, was found an opportunity to demonstrate that it is possible to achieve the best results through the design of a new architecture of its information systems with a high level of technological standardization and alignment with the business, and as a case study of Mozambique's National Institute of Statistics. © 2016 AISTI.


Aires J.,NOVA Information Management School | Santos V.,NOVA Information Management School
Iberian Conference on Information Systems and Technologies, CISTI | Year: 2016

The Smart Cities can be seen as a new approach to dealing with urban problems such as traffic management. Through the availability, infrastructure and quality of Information Technologies and human capital the quality of citizens' life can improve, their participation is promoted and better monitoring of events occurring in the city is provided. As Lisbon is a big city, this article seeks to study its strategies and the projects that have been implemented, comparing them with those that have been held in Rio de Janeiro and Barcelona. © 2016 AISTI.

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