1,721,143 research outputs found
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
Load-Driven Dynamic User Assignment Algorithms for Dense Cellular Networks
No full textA key option to further increase mobile network capacity is to deploy dense cellular networks (DCNs). This densification of cellular networks raises challenging issues though, as it likely increases the spatial variation and temporal fluctuations in load. To harness the full potential of DCNs, cell selection algorithms must take these varying load conditions into account. In this paper we study the optimal user association in DCNs based on a Linear Program (LP). Since several system parameters tend to be unknown and time-varying in practice, we develop a dynamic, self-organizing, and load-aware cell selection algorithm: the Shadow Price Assignment (SPA) algorithm. Our algorithm realizes an optimal user association without explicit knowledge of the system parameters by using a parsimonious set of dynamically adapted control parameters. We establish convergence of the control parameters under suitable assumptions. For larger systems the convergence may be slower, and we propose a local clustering approach to further improve the user-perceived performance in systems with many APs. Extensive simulations confirm that the SPA algorithm substantially outperforms conventional approaches
Polling: past, present, and perspective
Full text linkThis is a survey on polling systems, focussing on the basic single-server multi-queue polling system in which the server visits the queues in cyclic order. The main goals of the paper are: (i) to discuss a number of the key methodologies in analyzing polling models; (ii) to give an overview of recent polling developments; and (iii) to present a number of challenging open problems
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
Heavy Loads and Heavy Tails
Full text linkThe present paper is concerned with the stationary workload of queues with
heavy-tailed (regularly varying) characteristics. We adopt a transform
perspective to illuminate a close connection between the tail asymptotics and
heavy-traffic limit in infinite-variance scenarios. This serves as a tribute to
some of the pioneering results of J.W. Cohen in this domain. We specifically
demonstrate that reduced-load equivalence properties established for the tail
asymptotics of the workload naturally extend to the heavy-traffic limit
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