1,721,150 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
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
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
Bistorta manshuriensis complex (마디풀과) 의 계통과 분류
Full text link학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 생명과학부, 2018. 2. Chong-Wook Park.The Bistorta manshuriensis species complex consists of closely related and morphologically variable five taxa distributed in northeast Asia including Russia Far East, North East China, Korea and Japan. Taxonomic identity and species delimitations have been problematic in the complex. To delimit species boundaries, and to clarify taxonomic postion and phylogenetic relationships within the B. manshuriensis complex, major morphological characters were examined and DNA sequences were analyzed. The results of morphological analyses show that the length and width of leaf blade, position of maximum width in the leaf blade ratio between length and width of leaf blade, length of petiole wing are useful characteristics in distinguishing the taxa of the complex. Somatic chromosome counts revealed diploids (2n = 24) and tetraploids (2n = 48) in the complex. The chromosome counts reported herein represented the first reports for B. manshuriensis and B. alopecuroides. Variations in ITS and cpDNA regions were examined in 182 accessions sampled from 82 populations from almost the entire distribution area of the taxa of the B. manshuriensis complex. Twenty eight ribotypes were identified on the basis of 22 substitutions and one indel in the ITS. Ribotype polymorphism was prevalent in all taxa of the complex. in the majority of populations. A geographically widespread ribotype was detected in all populations examined except two populations in Korea. Among 28 ribotypes, eight were shared by two or more taxa of the complex and thirteen ribotypes were population-specific. Forty three haplotypes were identified on the bases of 64 nucleotide substitutions and 1 indel in the combined cpDNA sequence data. Eight haplotypes were shared by two or more taxa of the complex, and twenty seven haplotypes were population-specific. A geographically widespread haplotype distributed in 34 populations was detected in the complex. TCS haplotype network and phylogenetic tree analyses inferred from the combined cpDNA sequence data indicated several lineages in the complex. However, no lineage corresponded to the currently recognized delimitations of taxa. Based on nuclear rDNA ITS and cpDNA phylogenetic analysis as well as TCS network analysis, it is concluded that the speciation in the B. manshuriensis complex involved the complex pattern of hybridization, incomplete lineage sorting, mutations and geographical divergence.I. Introduction 1
II. Materials and methods . 8
III. Results 30
1. Morphology 30
2. Principal components analysis 50
3. Chromosome number 55
4. DNA sequencing 61
Nuclear DNA 67
Chloroplast DNA 75
IV. Discussion 96
Monophyly of the B. manshuriensis complex 89
ITS polymorphisms 89
Haplotype polymorphisms 90
Variation of the tetraploid complex 94
Variation of the diploid complex 94
Conclusion 98
V. Taxonomic treatment 100
Keys to the species of B. manshuriensis complex 102
1. B. manshuriensis 103
2. B. officinalis 107
3. B. pacifica 117
4. B. koreana 125
VI. Literature cited 129
VII. Appendices 140
Appendix 1. Aligned sequences of nrDNA ITS region from taxa of the B. manshuriensis complex and closely related species 140
Appendix 2. Aligned sequences of chloroplast DNA trnK intron, matK gene and ndhF gene regions from taxa of the B. manshuriensis complex and closely related species 164Docto
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