1,720,991 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
A Taxonomy of Infinite State Processes
No full textAbstractIn this tutorial paper, we consider various classes of automata generated by simple rewrite transition systems. These classes are defined by two natural hierarchies, one given by interpreting concatenation of symbols in the rewrite system as sequential composition, and the other by interpreting concatenation as parallel composition. In this way we provide natural definitions for commutative (parallel) context-free automata, multiset (parallel, or random access, push-down) automata, and Petri nets
Preface Volume 9
No full textAbstractThis volume contains a selection of the papers which were presented at Infinity'97, the Second International Workshop on Verification of Infinite State Systems, which took place in Bologna (Italy) during 11-12 July 1997 as a satellite of ICALP'97, the 24th International Colloquium on Automata, Languages and Programming. The aim of the workshop was to provide a forum for researchers interested in the development of mathematical techniques for the analysis of infinite state systems. This topic has received a concerted effort over the past few years, particularly within the Concurrency Theory community. The basis of this effort has been the realization that an understanding of infinite state systems is necessary in order to have a complete picture of general process algebras, Petri nets, or other formalisms incorporating value-passing, real-time, hybrid, and/or probabilistic aspects. Its importance has grown however by the further realization that techniques which are developed for infinite state systems - particularly structural techniques - can potentially provide elegant solutions to the state-space explosion problem in the analysis of finite state systems, as well as to classical problems in language theory. Infinity'97 featured an invited talk given by Géraud Sénizergues (Bordeaux), who presented an overview of his recent proof of the long-standing open problem concerning the decidability of deterministic push-down automata. A lengthy extended abstract of this talk is included in this volume.The Program Committee for Infinity'97 included Ahmed Bouajjani (Grenoble), Julian Bradfield (Edinburgh), Didier Caucal (Rennes), Karel Culik II (South Carolina), Tom Henzinger (Berkeley), Kim Larsen (Aalborg), Faron Moller (Uppsala) and Bernhard Steffen (Passau). We would like to thank the above for their efforts, as well as the referees who assisted in the selection of the regular contributions among the submissions received. We also wish to thank the members of the local organising committee, in particular Roberto Gorrieri (Bologna), who made it possible to hold Infinity'97 as a satellite workshop of ICALP'97Faron MollerNovember 199
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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