1,721,027 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
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
Population structure and genomic diversity of the Einsiedler horse.
Get PDFThe breeding history of the Einsiedler horse is closely connected with the Benedictine cloister Einsiedeln. In the mid-nineteenth century, it was decided to use European Warmblood stallions for cross-breeding and to abandon the selection of stallions. Since that time, it has only been possible to trace back the origin of Einsiedler horses using maternal ancestry information. Here, we collected high-density genotype data for European Warmblood horses (Selle Français, Swiss Warmblood and Einsiedler) and Franches-Montagnes horses, the last native Swiss horse breed, to unravel the current population structure of the Einsiedler horse. Using commonly applied methods to ascertain fine-scale population structures, it was not possible to clearly differentiate the Einsiedler from other European Warmblood horses. However, by means of runs of homozygosity (ROH) we were able to detect breed-specific ROH islands for the Einsiedler horse, including genes involved in domestication and adaptation to high altitude. Therefore, future breeding activities should involve the screening of these breed-specific ROH segments, the revival of cryopreserved sperm and the selection of Einsiedler stallions
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
Positioning of 15,036 Single Nucleotide Polymorphism (SNP) Loci using order algorithms and estimates of pair wise linkage disequilibrium (LD) in Australian dairy cattle
No full textZiel dieser Diplomarbeit war es, mit mathematischen Methoden die chromosomale Position von genetischen Markern basierend auf Schätzwerten des paarweisen Gametenphasenungleichgewichtes (GPU) von Genorten im Rinder-Genom zu bestimmen. Für die Untersuchung standen 15.036 single nuceotide polymorphism (SNP) Marker zur Verfügung, die bei 1.546 australischen Holstein-Friesian Stieren genotypiert wurden. Die Suche einer optimalen Anordnung der SNP-Marker aufgrund von paarweisen Ähnlichkeiten bzw. Distanzen ist eine Version des bekannten "Traveling Salesperson Problems" (TSP). In dieser Arbeit wurden für die optimale Lösung des TSP die Methoden HOPACH (Laan & Pollard 2003), Fast Optimal Leaf Order (Joseph et al. 2001) und Sorting Points into Neighborhood (SPIN) (Tsafrir et al. 2005) angewendet. Ein Vergleich zwischen den Positionen aus der aktuellen Rinder Genom Karte (Btau3.1) und den einzelnen Positionsergebnissen der Algorithmen zeigte, dass nur SPIN für die Positionierung von genetischen Markern basierend auf deren GPU Schätzwerten erfolgreich angewendet werden konnte. Zur Beschreibung des GPU wurden die häufig verwendeten Maße Lewontins's D prime (D') und der quadrierte Korrelationskoeffizient r² verwendet. Die Ergebnisse zeigten, dass D' nützlich ist, eine erste Anordnung von SNPs zu generieren und r² erfolgreich angewendet werden kann, um nicht katalogisierte SNPs auf aktuellen Gen-Karten zu positionieren und in weiterer Folge deren physikalische bzw. genetische Position zu berechnen.The aim of this study was to develop a new procedure for determining locus order solely from pair-wise estimates of linkage disequilibrium (LD) - a so-called LODE map - for a high density single nucleotide polymorphism (SNP) marker panel in dairy cattle. A total of 15,036 SNP were genotyped for 1,546 Australian Holstein Friesian bulls. The proposed formulation of genetic mapping based on LD can be considered as a version of traveling salesperson problem (TSP) - i.e. many solutions need to be optimized to find an optimal outcome. In this study three different ordering algorithms were applied, providing solutions for the TSP: HOPACH (Laan & Pollard 2003), Fast Optimal Leaf order (Joseph et al. 2001) and Sorting Points into Neighbrhood (SPIN) (Tsafrir et al. 2005). The results have been discussed and compared in depth, concluding that the unsupervised novel approach of SPIN was most suitable to create final order of SNPs on single chromosomes and to align unknown SNPs on the current bovine map. Two commonly used measures of LD have been applied: Lewontin's D prime (D') and the squared correlation coefficent, r². The results clearly indicate that Lewontin's D prime (D') is an effective parameter for providing the framework of locus order, and correlation coefficient r² is useful for positioning unaligned loci.vorgelegt von Markus NeuditschkoWien, Univ. für Bodenkultur, Dipl.-Arb., 2008Zsfassung in dt. Sprach
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
Positioning of 15,036 Single Nucleotide Polymorphism (SNP) Loci using order algorithms and estimates of pair wise linkage disequilibrium (LD) in Australian dairy cattle
No full textZiel dieser Diplomarbeit war es, mit mathematischen Methoden die chromosomale Position von genetischen Markern basierend auf Schätzwerten des paarweisen Gametenphasenungleichgewichtes (GPU) von Genorten im Rinder-Genom zu bestimmen. Für die Untersuchung standen 15.036 single nuceotide polymorphism (SNP) Marker zur Verfügung, die bei 1.546 australischen Holstein-Friesian Stieren genotypiert wurden. Die Suche einer optimalen Anordnung der SNP-Marker aufgrund von paarweisen Ähnlichkeiten bzw. Distanzen ist eine Version des bekannten "Traveling Salesperson Problems" (TSP). In dieser Arbeit wurden für die optimale Lösung des TSP die Methoden HOPACH (Laan & Pollard 2003), Fast Optimal Leaf Order (Joseph et al. 2001) und Sorting Points into Neighborhood (SPIN) (Tsafrir et al. 2005) angewendet. Ein Vergleich zwischen den Positionen aus der aktuellen Rinder Genom Karte (Btau3.1) und den einzelnen Positionsergebnissen der Algorithmen zeigte, dass nur SPIN für die Positionierung von genetischen Markern basierend auf deren GPU Schätzwerten erfolgreich angewendet werden konnte. Zur Beschreibung des GPU wurden die häufig verwendeten Maße Lewontins's D prime (D') und der quadrierte Korrelationskoeffizient r² verwendet. Die Ergebnisse zeigten, dass D' nützlich ist, eine erste Anordnung von SNPs zu generieren und r² erfolgreich angewendet werden kann, um nicht katalogisierte SNPs auf aktuellen Gen-Karten zu positionieren und in weiterer Folge deren physikalische bzw. genetische Position zu berechnen.The aim of this study was to develop a new procedure for determining locus order solely from pair-wise estimates of linkage disequilibrium (LD) - a so-called LODE map - for a high density single nucleotide polymorphism (SNP) marker panel in dairy cattle. A total of 15,036 SNP were genotyped for 1,546 Australian Holstein Friesian bulls. The proposed formulation of genetic mapping based on LD can be considered as a version of traveling salesperson problem (TSP) - i.e. many solutions need to be optimized to find an optimal outcome. In this study three different ordering algorithms were applied, providing solutions for the TSP: HOPACH (Laan & Pollard 2003), Fast Optimal Leaf order (Joseph et al. 2001) and Sorting Points into Neighbrhood (SPIN) (Tsafrir et al. 2005). The results have been discussed and compared in depth, concluding that the unsupervised novel approach of SPIN was most suitable to create final order of SNPs on single chromosomes and to align unknown SNPs on the current bovine map. Two commonly used measures of LD have been applied: Lewontin's D prime (D') and the squared correlation coefficent, r². The results clearly indicate that Lewontin's D prime (D') is an effective parameter for providing the framework of locus order, and correlation coefficient r² is useful for positioning unaligned loci.vorgelegt von Markus NeuditschkoWien, Univ. für Bodenkultur, Dipl.-Arb., 2008Zsfassung in dt. Sprach
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