1,721,927 research outputs found
Combinations of covariance selections for graphical modelling.
Full text linkWe explore the possibility of composing the results of a fixed number of Gaussian graphical model selections on some partially overlapping variables. This appears to be an useful approach in all the research areas where a large amount of data from different sources and types of experiments is available. Therefore the focus is in binding together information coming from heterogeneous studies to improve the understanding of a particular phenomenon of interest. The proposed approach relies on numerical results on artificial and real data
The Probabilistic Zeta Function of Alternating and Symmetric Groups
No full textThe probability that a finite group G is generated by s elements is given by a truncated Dirichlet series in s, denoted by P(G,s). We give an explicit criterion that allows one to recognize whether the factor group G/Frat(G) is simple by only looking at the coefficients of P(G,s). In order to get such a criterion, we prove that the series derived from P(G,s) by removing the even-indexed terms has only a simple zero at s=1
A graphical modelsapproach for comparing gene sets.
No full textRecently, a great effort in microarray data analysis is directed towards the study of the so-called gene sets. A gene set is defined by genes that are, somehow, functionally related. For example, genes appearing in a known biological pathway
naturally define a gene set. The gene sets are usually identified from a priori
biological knowledge. Nowadays, many bioinformatics resources store such kind
of knowledge (see, for example, the Kyoto Encyclopedia of Genes and Genomes,
among others). In this paper we exploit a multivariate approach, based on graphical
models, to deal with gene sets defined by pathways. Given a sample of microarray
data corresponding to two experimental conditions and a pathway linking some
of the genes, we investigate whether the strength of the relations induced by the
functional links change among the two experimental conditions
Interventi per il rinforzo dell'isolamento termico: analisi fisico-tecnica, energetica ed economica
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Indicazioni per l'isolamento termico nei capitolati di appalto: aspetti tecnici ed economici
No full text
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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