Alexandre Pinto

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The Brazilian Cerrado is a diversity hotspot due to its high level of endemism and rapid loss of habitats. It is estimated that the number of herbaceous species is four times higher than that of woody species. Increasing levels of nitrogen additions to natural ecosystems have been indicated as a determinant of biodiversity loss. We investigated the effects(More)
The agriculture, forestry and other land use (AFOLU) sector is responsible for approximately 25% of anthropogenic GHG emissions mainly from deforestation and agricultural emissions from livestock, soil and nutrient management. Mitigation from the sector is thus extremely important in meeting emission reduction targets. The sector offers a variety of(More)
Attribute-based encryption (ABE) has attracted considerable attention in the research community in recent years. It has a number of applications such as broadcast encryption and the cryptographic enforcement of access control policies. Existing instantiations of ABE make use of access structures encoded either as trees of Shamir threshold secret-sharing(More)
In [3] the authors give the first mathematical formalization of an unconditionally secure commitment scheme. Their construction has some similarities to one used to build authentication codes, so they raise the question whether there is some relation between commitment schemes and authentication schemes. They conjecture that authentication schemes with(More)
This paper evaluates the long-run effects of economic instability. In particular, we study the impact of idiosyncratic shocks to father’s income on children’s human capital accumulation variables such as school drop-outs, repetition rates and domestic and non-domestic labor. Although, the problem of child labor in Brazil has declined greatly during the last(More)
AIMS To identify demographic, clinical, functional and inherent quality of life (QOL) and depression factors with impact on use of the Emergency Services (ES) or readmission after hospital discharge for acute exacerbation of chronic obstructive pulmonary disease (COPD) over a period of 66 weeks. QOL was evaluated by the St. George's Respiratory(More)
In the information theoretic world, entropy is both the measure of randomness in a source and a bound for the compression achievable for that source by any encoding scheme. But when we must restrict ourselves to efficient schemes, entropy no longer captures these notions well. For example, there are distributions with very low entropy that nonetheless look(More)
Kolmogorov Complexity measures the amount of information in a string by the size of the smallest program that generates that string. Antunes, Fortnow, van Melkebeek, and Vinodchandran captured the notion of useful information by computational depth, the difference between the polynomial-time-bounded Kolmogorov complexity and traditional Kolmogorov(More)