1,721,150 research outputs found
Il piacere di giocare con i numeri
No full textViene presentata un’attività sviluppata nelle classi quarte di un liceo scientifico, il cui scopo è quello di valorizzare alcuni processi di ricerca tipici del lavoro del matematico, come l’analisi di casi particolari, la produzione di esempi e controesempi, la ricerca di regolarità, la formulazione di congetture, la costruzione e la manipolazione di opportune formule. Tradizionalmente presentata come punto di partenza, la teoria matematica emerge solo al termine dell’attività, come risultato del lavoro degli alunni stessi
Randomized motion planning on parallel and distributed architectures
No full textMotion planning is a fundamental problem in a number of application areas, including robotics, automation, and virtual reality! This paper describes a parallel implementation of a motion planning algorithm particularly suited for complex systems characterized by many degrees of freedom. nle implementation is based on the concurrent exploration of the search space by a randomized planner replicated on each node of the parallel architecture. All processing elements compete to obtain a solution over the entire search space in an OR-parallel fashion, Reported results refer to a low-cost cluster of PCs and an SGI Onyx2 parallel machine. The experiments emphasize the effectiveness of the approach for complex, high-dimensionality planning problems.. We believe that the approach may, be useful in other complex search problems, especially when the parallel architecture exhibits relatively high communication latency
End-of-life care after the legal introduction of advance directives: A qualitative study involving healthcare professionals and family caregivers of patients with amyotrophic lateral sclerosis
No full text
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
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
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
Pliocene Anancus arvernensis (Croizet & Jobert, 1828) remains from Cetona (Siena): stratigraphy, chronology and paleoenvironment
No full textRemains of Anancus arvernensis have been discovered in the site of Le Lame, on the eastern slope of Mt. Cetona. The remains come from within beach and lagoon deposits that delimited the Cetona Mountain to the east when it constituted an island rising for a few hundred metres above sea level. The remains, for which we present the dimensional data, belongs to a single animal that died close to the beach and that was later disarticulated by erosional processes. It is a common species of the Triversa Faunal Unit, that characterises the early Villafranchian although it is also found in older (Turolian-Ruscinian) and younger assemblages (up to the Olivola Faunal Unit). The stratigraphic setting of the remains allows their attribution to the Triversa Faunal Unit, at the end of the early Pliocene-beginning of the Middle Pliocene or to a slightly earlier Mammal Unit
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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