185 research outputs found

    From data acquisition to data fusion : a comprehensive review and a roadmap for the identification of activities of daily living using mobile devices

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    This paper focuses on the research on the state of the art for sensor fusion techniques, applied to the sensors embedded in mobile devices, as a means to help identify the mobile device user’s daily activities. Sensor data fusion techniques are used to consolidate the data collected from several sensors, increasing the reliability of the algorithms for the identification of the different activities. However, mobile devices have several constraints, e.g., low memory, low battery life and low processing power, and some data fusion techniques are not suited to this scenario. The main purpose of this paper is to present an overview of the state of the art to identify examples of sensor data fusion techniques that can be applied to the sensors available in mobile devices aiming to identify activities of daily living (ADLs)

    Os determinantes da divulgação de informação financeira na internet: evidência empírica nos municípios portugueses

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    A Administração Pública, no geral, e os municípios em particular, tomam progressivamente consciência de que a divulgação da informação representa um fator determinante para a melhoria da participação ativa dos cidadãos, da eficiência de resultados e da transparência. A Internet poderá ser um excelente meio de divulgação, pelo que a presente investigação tem por objetivo estudar, para o ano de 2010, os determinantes da divulgação de informação financeira na Internet pelos municípios portugueses. Foi calculado um índice de divulgação de informação, atendendo aos requisitos exigidos pelo Tribunal de Contas e utilizou-se o modelo de Poisson para validar as hipóteses definidas. Os resultados da estimação do modelo permitiram verificar que existe uma relação estatisticamente significativa entre a divulgação da informação financeira na Internet e a dimensão populacional, a ideologia política, bem como o nível de endividamento líquido do município

    Phase transition in the Galam's majority-rule model with information-mediated independence

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    We study the Galam's majority-rule model in the presence of an independent behavior that can be driven intrinsically or can be mediated by information regarding the collective opinion of the whole population. We first apply the mean-field approach where we obtained an explicit time-dependent solution for the order parameter of the model. We complement our results with Monte Carlo simulations where our findings indicate that independent opinion leads to order-disorder continuous nonequilibrium phase transitions. Finite-size scaling analysis show that the model belongs to the mean-field Ising model universality class. Moreover, results from an approach with the Kramers-Moyal coefficients provide insights about the social volatility.Comment: Invited paper for the special issue "In honor of professor Serge Galam for his 70th birthday and forty years of sociophysics" (special issue editors: A. Martins, T. Cheon, X.Tang, B. Chopard, S. Biswas), to appear in Physic
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