Browsing by Issue Date, starting with "1998-09"
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- Acoplamento e ressonância na análise de osciladores na economia: metáfora, mecânica e dinâmicaPublication . Louçã, Francisco
- Sobre a possibilidade de uma zona de comércio livre entre os Estados Unidos e a União EuropeiaPublication . Castro, Ana Maria Lopes Madeira Costa; Castro, Armando de
- Understanding the adoption and use of information systems/ Information technology in small and medium-sized manufacturing entreprises: a study in portuguese industryPublication . Caldeira, Mário; Ward, JohnThis research analysed factors and sets of factors that affect and explain the varying leveis of success in the adoption and use of IS/IT (Inforrnation Systemsllnforrnation Technology) in Portuguese manufacturing SMEs (Small and Medium-sized Enterprises). The study set out to fill a 'gap in knowledge not covered by previous research into the area of IS/IT in SMEs. Existing work was found to be of limited relevance or was out-of-date, due to the rapid evolution of IS/IT, and did not address the Portuguese context. The study followed a realist approach to social enquiry. Seeking to explain IS/IT success, it is necessary to understand the perspectives and social relationships amongst the key actors involved in the process of IS/IT- adoption and use. Case study research was undertaken in twelve SMEs operating in the Portuguese manufacturing industry. A total of 56 interviews were conducted with top managers, IS/IT managers, IS/IT staff, and IS/IT suppliers. The factors identified as associated with IS/IT success were clustered into four categories according to their perceived relevance. Interrelationships amongst factors were established and the common pattems across firrns with similar leveis of IS/IT adoption and success were analysed. This research demonstrates that a combination of factors were deterrninant to explain IS/IT adoption and success. These are related to the involv ment of the top managers in the process of IS/IT adoption and use, and to the development of IS/IT competencies, in-house or in associated IS/IT suppliers. Of particular importance is the presence of an individual in the firm with IS/IT knowledge, CEO trust, and a view on how to incorporate IS/IT in the strategic development of the firm. ln the SMEs that were more successful in adopting and using IS/IT, the establishment of co-operative links with IS/IT suppliers was essentially based on personal relationships or ownership of the IS/IT enterprise, rather than on contractual relationships. The findings were validated by comparison with existing theory, and resource-based theory was found to provide a coherent explanation of the results of the empírical work.
- Sobre a possibilidade de uma zona de comércio livre entre os Estados Unidos e a União EuropeiaPublication . Dias, Ana Maria Lopes Madeira Costa; Castro, Armando de
- Selecção de carteiras de activos em seguros e fundos de pensõesPublication . Gigante, Cristina Maria Salvado; Garcia, JorgeA selecção de carteiras de activos aplicada ao caso dos seguros e fundos de pensões deve ler em conta as responsabilidades a longo prazo assumidas por estes investidores institucionais. A forma encontrada para o fazer passa por acrescentar mais uma dimensão ao modelo, o preço da carteira, transportando o problema de optimização para um plano tridimensional. Para a resolução deste problema importa salientar o papel do actuário e o do gestor de investimentos. Ao actuário cabe determinar o preço da carteira e ao gestor de investimentos definir a estratégia de investimentos, tendo em conta aquele preço e um determinado perfil de risco que pretende assumir. Esta dissertação tem por objectivo aplicar o modelo de alocação de activos ao caso dos seguros e dos fundos de pensões num contexto de incerteza quanto a certos factores, tais como, a taxa de inflação e a taxa de retorno dos investimentos. Assim sendo, são aplicados modelos para projectar aquelas variáveis ao longo de vinte anos, o horizonte temporal considerado, de modo a obter os elementos necessários à aplicação do modelo de selecção de carteira: valores esperados, variâncias e covariâncias das taxas de retorno dos activos e das responsabilidades.