It is proven that for every random variable with a countably infinite set of outcomes and finite entropy there exists an optimal prefix code which can be constructed from Huffman codes for truncated versions of the random variable, and that the average lengths of any sequence of Huffman codes for the truncated versions converge to that of the optimal code. Also, it is shown that every optimal i...

Today, social networks are part of the lives of our students. Facebook it’s probably the main site of encounter, communication, interaction and sharing of ideas and matters of common interest among college students. In this context, and given the possibilities that social networks offer to create a learning effective environment, participatory and interactive, we present a case study in a class...

Explaining and predicting the popularity of online multimedia content is an important problem for the practice of information dissemination and consumption. Recent work advances our understanding of popularity, but one important gap remains: to precisely quantify the relationship between the popularity of an online item and the external promotions it receives. This work supplies the missing lin...

Very recently, Ehrenborg and Steingrı́msson [7] studied enumerative properties of the excedance statistic. Let Sn denote the permutation group on the set {1, 2, . . . , n} and π = π1 π2 · · ·πn ∈ Sn . An excedance in π is an index i such that πi > i . Following [7], we encode the excedance set of a permutation as a word in the letters a and b. The excedance word w(π) of π is the ab-word w1w2 · ·...

Iris recognition provides a reliable method for personal identification. Inspired by recent achievements in the field of visual neuroscience, we encode the non-local image comparisons qualitatively for iris recognition. In this scheme, each bit iris code corresponds to the sign of an inequality across several distant image regions. Compared with local ordinal measures, the relationships of diss...

In this study we investigate the spatial relationship between Superfund sites and the racial, ethnic, and economic characteristics of the areas surrounding those sites in the state of Florida. Unlike many previous environmental justice studies, we examine census tracts rather than larger aggregates such as counties or zip codes. We also look at the problem of environmental injustice longitudina...

Recent research has shown the value of social metrics for defect prediction. Yet many repositories lack the information required for a social analysis. So, what other means exist to infer how developers interact around their code? One option is static code metrics that have already demonstrated their usefulness in analyzing change in evolving software systems. But do they also help in defect pr...

Recently, flood damage has become a social problem owing to unexperienced weather conditions arising from climate change. An immediate response heavy rain is important for the mitigation of economic losses and also rapid recovery. Spatiotemporal precipitation forecasts may enhance accuracy dam inflow prediction, more than 6 h forward mitigation. However, ordinary ConvLSTM limitation predictable...