1,721,027 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
An Evaluation of the Reading Disabilities Candidate Genes DYX1C1 and ROBO1
No full textReading disabilities (RD) have a significant genetic basis and chromosomes 3p12-q13 and 15q15-21 have shown replicated linkage to RD or reading measures. This study evaluated two RD candidate genes within these regions: DYX1C1 on chromosome 15q21 and ROBO1 on chromosome 3p12. DYX1C1 was tested for association using a family-based analysis of two independent samples. No statistically significant association was observed between the 10 tested DYX1C1 single nucleotide polymorphisms (SNPs) and RD or any of the quantitative traits. A review and meta-analysis of the potentially functional SNPs at the -3G/A and 1249G/T positions did not find strong support for these alleles as risk alleles for RD. ROBO1 was also evaluated in this study using SNPs that previously showed association with memory and reading measures in a population-based sample. None of the SNPs showed significant association with RD or any of the quantitative traits after correction for multiple testing.MAS
Genes and Neural Cell Types Influencing Reading and the Overlap with Neurodevelopmental Disorders
Full text linkAlthough a breadth of research has been conducted on Reading Disabilities (RD), the genes, molecular mechanisms, and cell types involved in its etiology remain to be elucidated. Understanding these processes is complicated by the frequent overlap between RD and other neurodevelopmental disorders. The purpose of this dissertation was to identify genes and neural cell types involved in the development of RD, while considering the genotypic/phenotypic overlap with comorbid disorders. To that end, genome-wide association studies (GWAS) and polygenic risk scores (PRS) were used to identify genes associated with word reading and examine shared genetic etiology with neurodevelopment/psychiatric disorders. We identified two novel loci for word reading, with top SNPs in or near ARHGAP23 (n=624) and the CCNT1/LINC00935 region (n=4430) (p~10-7) (significant by gene-based analysis (p~10-6)). We also identified significant genetic overlap for word reading and intelligence, word reading and educational attainment, and word reading and attention deficit hyperactivity disorder (ADHD) (threshold for significance=7.14x10−3) and observed shared genes between word reading and Autism Spectrum Disorder (ASD) and language. We observed genes involved in neuronal migration among top results. To increase power to identify genes for word reading, we performed Hypothesis-Driven GWAS in a larger sample. SNPs in DOCK7, CDH4 (n~26,000), and intergenic between BTG3-C21orf91 (n=4152) showed significant association. Top SNPs were eQTLs/sQTLs, providing hints to the molecular mechanism of risk for these genes. We also found that genes previously implicated in ASD cumulatively and significantly contributed to word reading (n=624). We hypothesized the link between RD-ASD was through deficits in language systems. To determine neural cell types, we used Linkage Disequilibrium Score Regression to look for cell enrichment in our GWAS results and correlated traits -- as determined by PRS. We demonstrated enrichment of adult excitatory neurons in word reading; adult excitatory neurons in ADHD; and adult and fetal excitatory neurons, inhibitory neurons, astrocytes, and oligodendrocytes in educational attainment and cognitive ability. This thesis contributed novel genes and neural cell types to RD, as well as an understanding of the shared overlap between its comorbid disorders. It can inform future functional studies examining the molecular mechanisms of reading.Ph.D
Identification of Genes and Putative Regulatory Variants Contributing to Reading Disabilities and Attention Deficit/ Hyperactivity Disorder
No full textReading Disabilities (RD) and Attention Deficit/Hyperactivity Disorder (ADHD) are common neurodevelopmental disorders with evidence for shared genetic etiology. This study examined four predicted neuronal migration genes in RD (DCDC2, KIAA0319, DCDC2B and NEDD4L), and three of these genes in ADHD (DCDC2, DCDC2B and NEDD4L).
Putative regulatory elements of DCDC2 (6p) and KIAA0319 (6p) were screened to identify functional risk variants that explain previous association findings. No statistically significant associations were observed in DCDC2. In KIAA0319, variants with predicted regulatory function showed association with RD. This supports the hypothesis that causal RD risk variants in KIAA0319 alter gene expression. DCDC2B (1p), the homolog of DCDC2, showed suggestive evidence for association to ADHD, but not RD. Previous association findings in NEDD4L (18q) could not be replicated.
No pleiotropic gene for RD and ADHD was identified. However, together with previous findings, this study supports that neuronal migration may be a common underlying deficit in both RD and ADHD.MAS
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