1,721,035 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
Exploring the effects of migration and admixture on human populations through time, using ancient DNA
Get PDFArchaeogenetics is the research field of studying the genetic information contained in ancient DNA (aDNA) to gain insight into the past. Analysis of human aDNA from archaeological material has allowed archaeogeneticists to observe changes in the genetic composition of populations in an area through time. By using aDNA in this manner, a higher degree of resolution can be gained into the timing of past genetic transitions, compared to the resolution that is available when inferring the past from modern genomic data alone. In this thesis, I focus on the movement of genes, via migration of people and/or admixture, and the information that this movement can provide about human history. I introduce the differences between the inheritance mechanisms of uniparental (mitochondrial DNA and the Y-chromosome) and autosomal markers; the forces of evolution in population genetics; some methods commonly used in the analysis of human aDNA in the manuscripts included in this thesis; prior (archaeo-)genetics research regarding the population history of West Eurasia and the Americas -as context for my own research in these geographic areas-, and discuss the information gained by my own work about the population history of the areas studied, the limitations of archaeogenetic inferences, and the importance of combining archaeogenetic results with those from other disciplines when studying human history.1. Introduction 1.1 Introduction to human population genetics 1.1.1 Inheritance patterns in humans 1.1.2 The forces of evolution 1.2 Analytical methods used in ancient DNA 1.2.1 Analysis of common variants in human population history 1.2.1 Using rare variation to study human history 1.3 The major genetic transitions in Western Eurasia from the Mesolithic to the Bronze Age. 1.4 The population history of the Americas 2. Aim of the thesis Manuscript A Manuscript B Manuscript C 3. Overview of manuscripts and author’s contribution 3.1 Manuscript A 3.2 Manuscript B 3.3 Manuscript C 4. Manuscript A 5. Manuscript B 6. Manuscript C 7. Discussion 7.1 Insights gained by the work presented 7.2 Limitations to the archaeogenetic approach 7.3 How many individuals is enough? 7.4 Thoughts about the future of thinking about the past 8. Reference
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
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
Investigating human population structure through time with new computational methods and ancient DNA data
Get PDFThe revolution of sequencing technology has brought an exponential increase in the production of genomic data. This thesis tackles global and continental questions on human demographic history from two directions using genetic data. Manuscript A provides a novel analytical method for estimating migration rate and effective population size utilizing highcoverage whole genome sequences, while manuscript B and C reveal the history of population movement and interactions by directly analyzing genome-wide data from ancient individuals
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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