1,720,961 research outputs found
Chained structure of directed graphs with applications to social and transportation networks
Get PDFThe need to determine the structure of a graph arises in many applications. This paper studies directed graphs and defines the notions of [Formula: see text] -chained and [Formula: see text] -chained directed graphs. These notions reveal structural properties of directed graphs that shed light on how the nodes of the graph are connected. Applications include city planning, information transmission, and disease propagation. We also discuss the notion of in-center and out-center vertices of a directed graph, which are vertices at the center of the graph. Computed examples provide illustrations, among which is the investigation of a bus network for a city
PQser: a Matlab package for spectral seriation
No full textThe seriation problem is an important ordering issue which consists of finding the best ordering of a set of units whose interrelationship is defined by a bipartite graph. It has important applications in, e.g., archaeology, anthropology, psychology, and biology. This paper presents a Matlab implementation of an algorithm for spectral seriation by Atkins et al., based on the use of the Fiedler vector of the Laplacian matrix associated to the problem, which encodes the set of admissible solutions into a PQ-tree. We introduce some numerical technicalities in the original algorithm to improve its performance, and point out that the presence of a multiple Fiedler value may have a substantial influence on the computation of an approximated solution, in the presence of inconsistent data sets. Practical examples and numerical experiments show how to use the toolbox to process data sets deriving from real-world applications
Simulacri in legno di Sant’Efisio tra prototipi, modelli, repliche e varianti
No full textThe production of wooden simulacra of Saint Efisio experienced an intensification as a consequence for the miracles performed by the saint. Among the most famous specimens is the one carried in procession on January 15th, Holy Thursday and Easter Monday. Made in 1763 by Giuseppe Antonio Lonis, it has been taken as a model for many 18th century statues and in turn derives from the small-scale prototype of the “Museo del Duomo” of Cagliari, dated 1759. To the late 17th century dates back the realisation of the small Sant’Efisio, realized by an unknown local operator and donated in 2015 to the Archconfraternity of the Gonfalone
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Una testimonianza norense sull’attività urbanistica di un proconsole di Sardinia in età augustea
No full textNew analysis of three marble slabs from Nora preserved in the “Museo Archeologico Nazionale” of Cagliari. In the slabs, belonging to a large incomplete inscribed monument (CIL X, 7543 = AE 2001, 1110) from an unidentified building, is remembered the pro c[o(n)s(ule)] of Sardinia C. Mucius, C. f., Scaevola and an uncertain evergetic action accomplished, perhaps by the same governor, by means of private financial resources. The difference in height between the slabs emerged during the autopsy could be explained assuming with caution that them should not be assigned to a single inscription but to an epigraph engraved in two identical copies
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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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