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Modelação matemática de epidemias
Plácido, Sara; Silva, João; Balsa, Carlos; Nunes, Alcina; Barros, ElisaUma epidemia é um problema de saúde pública sendo importante modelar a sua propagação para que se possa atuar sobre ela. Para realizar a modelação existem duas grandes classes de com origem no modelo predador-presa (Lotka-Volterra), utilizam equações diferenciais para modelar o (de)crescimento das populações envolvidas. Estes modelos são o modelo Suscetíveis-Infetados (SI) e o modelo Suscetíveis-Infetados- -Rec...
A comparative study of two optimization clustering techniques on unemployment data
Barros, Elisa; Nunes, Alcina; Balsa, CarlosAn important strategy for data classi cation consists in organising data points in clusters. The k-means is a traditional optimisation method applied to cluster data points. Using a labour market database, we suggest the application of an alternative method based on the computation of the dominant eigenvalue of a matrix related with the distance among data points. This approach presents results consistent with ...
High-growth entrepreneurship and policy support in Portugal
Sarmento, Elsa de Morais; Figueira, Catarina; Theodorakopoulos, Nicholas; Nunes, AlcinaThis paper describes employer enterprise dynamics in Portugal for high-growth and gazelle enterprises for the period 1990-2007, using the methodology by Eurostat and OECD. It discusses stylized facts related to firm performance by size, sector and survival prospects, using two parallel perspectives, by turnover and by employment, when appropriate. It also discusses the importance of existing framework conditio...
Clustering techniques applied on cross-cectional unemployment data
Balsa, Carlos; Nunes, Alcina; Barros, ElisaUsing a cross-section database that observes the Portuguese labour market in two different phases of the business cycle, the present paper aims to address the issue of the segmentation of the Portuguese labour market taking into account the heterogeneity resulting from different unemployment characteristics observed along the Portuguese geographical space and applying two optimization clustering methods: the k-...
High-growth entrepreneurship and policy support in Portugal
Sarmento, Elsa de Morais; Figueira, Catarina; Theodorakopoulos, Nicholas; Nunes, AlcinaThis paper describes employer enterprise dynamics in Portugal for high-growth and gazelle enterprises for the period 1990-2007, using the methodology by Eurostat and OECD. It discusses stylized facts related to firm performance by size, sector and survival prospects, using two parallel perspectives, by turnover and by employment, when appropriate. It also discusses the importance of existing framework conditio...
Profiling high-growth enterprises in Portugal
Sarmento, Elsa de Morais; Theodorakopoulos, Nicholas; Figueira, Catarina; Nunes, AlcinaThis paper describes employer enterprise dynamics in Portugal for high-growth and gazelle enterprises for the period 1990-2007, using the methodology by Eurostat/OECD. It discusses stylized facts related to performance and employment by size, region and sector, to a detail which has not been previously considered, uncovering potential business areas of growth which are of prime importance for the country’s econ...
Profiling high-growth enterprises in Portugal
Sarmento, Elsa de Morais; Theodorakopoulos, Nicholas; Figueira, Catarina; Nunes, AlcinaThis paper describes employer enterprise dynamics in Portugal for high-growth and gazelle enterprises for the period 1990-2007, using the methodology by Eurostat/OECD. It discusses stylized facts related to performance and employment by size, region and sector, to a detail which has not been previously considered, uncovering potential business areas of growth which are of prime importance for the country’s econ...
Clustering entrepreneurship aspirations : innovation, growth and international ...
Nunes, Alcina; Balsa, CarlosIt is sometimes argued that nations differ in their underlying en-trepreneurial spirit. So, in recent years, more researchers started being interested in the analysis of entrepreneurship across countries and re-gions. Some of the international literature on the subject recognises that regional variation in entrepreneurship is significant and persistent, and often even exceeds national differences. Associated wi...
BUSINESS CREATION IN PORTUGAL AND SPAIN IN THE PERIOD 2000-2007: COMPARATIVE AN...
Sarmento, Elsa de Morais; Universidade de Aveiro; Nunes, Alcina; Instituto Politécnico de BragançaThe World Bank Group Entrepreneurship Survey (WBGES 2008) comprehends an extensive firm registry database of around one hundred countries. Based on this data source, we explore the trajectories of business creation from 2000 to 2007, among two both geographically and economically linked countries, Portugal and Spain, and of these as compared to the European Union and the OECD, as well as other countries and inf...
ESTUDO DO PERÍODO DE PERMANÊNCIA NAS LISTAS DE ESPERA NACIONAIS POR CIRURGIA – ...
Machado, Cândida; Instituto Politécnico de Bragança; Nunes, Alcina; Instituto Politécnico de BragançaConstituindo as listas de espera para cirurgia um problema na prestação de cuidados médicos nos países mais desenvolvidos é importante que se conheça, e perceba, a realidade que enquadra esta problemática de forma a melhorar o processo de implementação de medidas de gestão de listas de espera, já em prática ou a desenvolver, e a compreender o impacto das mesmas sobre os tempos de espera a que os utentes estão s...
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