1,720,955 research outputs found
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
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
Requêtes de comptage pour l’accès aux données en présence d’ontologies
No full textOntology-mediated query answering (OMQA) is a promising approach to data access and integration that has been actively studied in the knowledge representation and database communities for more than a decade. The vast majority of work on OMQA focuses on conjunctive queries, whereas more expressive queries that feature counting or other forms of aggregation remain largely unexplored. In this thesis, we introduce a general form of counting conjunctive query (CCQ), relate it to previous proposals, and study the complexity of answering such queries in the presence of ontologies expressed in the description logic ALCHI or its sublogics. As the general case of CCQ answering is intractable and often of high complexity over such ontologies, we consider two practically relevant restrictions, namely rooted CCQs and Boolean atomic CCQs, for which we establish improved complexity bounds.La réponse à des requêtes en présence d'ontologies est une approche prometteuse pour l'intégration et l'accès aux données qui a été activement étudiée ces quinze dernières années. La grande majorité des travaux dans ce domaine se concentre sur les requêtes conjonctives, alors que des requêtes plus expressives, qui offrent des fonctionnalités de comptage ou d'autres formes d'agrégation demeurent largement inexplorées. Dans cette thèse, nous introduisons une forme unifiée de requêtes de comptage, nous la relions à celles déjà existantes, et étudions la complexité du problème consistant à répondre à ces requêtes en présence d'ontologies exprimées dans la logique de description ALCHI ou l'une de ses sous-logiques. Dans la mesure où la complexité de ce problème dans le cas général est inaccessible en pratique et parfois très élevée sur de telles ontologies, nous considérons également deux restrictions sur ces requêtes: l'enracinement et l'atomicité, pour lesquelles nous établissons de meilleurs résultats en terme de complexité
Counting queries in ontology-based data access
No full textLa réponse à des requêtes en présence d'ontologies est une approche prometteuse pour l'intégration et l'accès aux données qui a été activement étudiée ces quinze dernières années. La grande majorité des travaux dans ce domaine se concentre sur les requêtes conjonctives, alors que des requêtes plus expressives, qui offrent des fonctionnalités de comptage ou d'autres formes d'agrégation demeurent largement inexplorées. Dans cette thèse, nous introduisons une forme unifiée de requêtes de comptage, nous la relions à celles déjà existantes, et étudions la complexité du problème consistant à répondre à ces requêtes en présence d'ontologies exprimées dans la logique de description ALCHI ou l'une de ses sous-logiques. Dans la mesure où la complexité de ce problème dans le cas général est inaccessible en pratique et parfois très élevée sur de telles ontologies, nous considérons également deux restrictions sur ces requêtes: l'enracinement et l'atomicité, pour lesquelles nous établissons de meilleurs résultats en terme de complexité.Ontology-mediated query answering (OMQA) is a promising approach to data access and integration that has been actively studied in the knowledge representation and database communities for more than a decade. The vast majority of work on OMQA focuses on conjunctive queries, whereas more expressive queries that feature counting or other forms of aggregation remain largely unexplored. In this thesis, we introduce a general form of counting conjunctive query (CCQ), relate it to previous proposals, and study the complexity of answering such queries in the presence of ontologies expressed in the description logic ALCHI or its sublogics. As the general case of CCQ answering is intractable and often of high complexity over such ontologies, we consider two practically relevant restrictions, namely rooted CCQs and Boolean atomic CCQs, for which we establish improved complexity bounds
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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