1,721,552 research outputs found
An inequality for norms of Poissonian Wick products
Full text linkAn inequality for the norms of Poisson Wick products, involving second quantization operators, will be presented
A family of polynomials and their application to inequalities of norms of Poisson wick products
No full textA family of polynomials {Pn(z)}n≥1, whose coefficients satisfy a system of linear equations, is introduced first. An inequality about the real part of Pn(z) is presented next, for complex numbers z whose real part is between 0 and 1. Finally, using Stein Complex Interpolation Theorem, we prove some inequalities about the norms of Poisson Wick products
Some norm inequalities for gaussian Wick products
No full textWe provide several inequalities for the L^q-norm of the Wick product of random
variables. These estimates are based on a Jensen’s type inequality for the Wick
multiplication, which we derive via a positivity argument. As an application we study
a certain type of anticipating stochastic differential equation whose solution is shown
to be an element of L^q for some q ≥ 1
Going 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
Holder type inequalities for norms of Wick products
Full text linkVarious upper bounds for the L2-norm of theWick product of two measurable functions of a random
variable X, having finite moments of any order, together with a universal minimal condition, are
proven. The inequalities involve the second quantization operator of a constant times the identity
operator. Some conditions ensuring that the constants involved in the second quantization operators
are optimal, and interesting examples satisfying these conditions are also included
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
A combinatorial identity and its application to Gaussian measures
Full text linkAssuming that a probability measure on ℝd has finite moments of any order, its moments are completely determined by two family of operators. The first family is composed of the neutral (preservation) operators. The second family consists of the commutators between the annihilation and creation operators. As a confirmation of this fact, a characterization of the Gaussian probability measures in terms of these two families of operators is given. The proof of this characterization relies on a simple combinatorial identity
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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