1,720,954 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
Genotyp-Phänotyp-Assoziation von drei kardiovaskulären Kandidatengenen unter Berücksichtigung der kardiovaskulären Risikofaktoren in Hinblick auf die Prävalenz des Myokardinfarkts bei jungen Patienten
No full textMulti factorial diseases like the coronary heart disease including the myocardial infarction are caused by a complex interaction of genetic and exogenic (meaning environmental, behavior based and sociocultural) factors. To determine the effect of the so called genetic polymorphism of cardiovascular phenotypes it is reasonable to analyze large homogeneous and accurately characterized populations. Only by using this method even small effects can be detected that contribute to the cause of myocardial infarcts. In such polymorphism-association-studies it is important to record the exogenic factors systematically because they can potentially impact the association between the genotype and phenotype. In this study 3436 patients of the RWTH Aachen university clinic were recruited. They were admitted with the clinical indication of their first intra cardiac catheter without a prior diagnosed coronary heart disease or any other non ischaemic cardiomyopathy and were of the same ethnic background. These patients were divided by age (patients younger than 65 years of age = high genetic influence / patients above 65 years of age = little genetic influence) and for each patient a thorough, cardiological determination of phenotypes was performed using coronary angiography, cineventriculographie and clinical parameters. Furthermore the classical cardiovascular risk factors (CRF = arterial hypertension, diabetes mellitus, hypercholesterolemia and smoking) were recorded and three candidate genes ( Interleukin-6 G-174C, Vitamin C-receptor Bsml and chemokine-receptor-2-V641-genetic polymorphism) belonging to the inflammatory system and therefore important for the pathophysiology of the coronary heart disease were analyzed. Finally a combined analysis of genetic and cardiovascular risk factors with regards to the prevalence of the myocardial infarction by stratification of the patient (potentially high genetic influence versus potential low genetic influence) was made. The myocardial infarction before the age of 65 was defined as a premature myocardial infarction. A significant correlation of individual allele of the genetic polymorphism (VDR BB, Il6 GC/CC, CCR2 VI/II) with high occurrences of myocardial infarctions became evident in the patient group younger than 65 (n= 1946). In our study these polymorphism were defined as genetic risk factors. A combined analysis of the four classic cardiovascular risk factors and the three genetic risk factors showed an additive effect regarding the occurrence of a myocardial infarction. The more risk factors (CRF + GRF; from 0-7) were present, the higher was the prevalence of the myocardial infarction. The patient's age was not associated with the infarcton in this group. In the patient group older than 65 years of age the combined analysis of the CRF risk factors showed only a weak correlation with the prevalence of a myocardial infarction. The examination of the GRF showed no correlation at all. In these patient groups the age was the main parameter for the development of a myocardial infarction. The presented examination allows the conclusion that certain genetic risk factors have an additive -if only a weak – effect on the predisposition of the development of a premature myocardial infarction. The tested genetic risk factors showed no effect on the patient group older than 65 years of age. Due to the very weak detectable effect of the tested genetic polymorphism it remains unclear, which relevance the test of GRF will have in the future and which direction it will take. The currant knowledge does not allow any improvement of the therapy by testing the GRF in the daily clinical routine
Genotyp-Phänotyp-Assoziation von drei kardiovaskulären Kandidatengenen unter Berücksichtigung der kardiovaskulären Risikofaktoren in Hinblick auf die Prävalenz des Myokardinfarkts bei jungen Patienten
No full textMulti factorial diseases like the coronary heart disease including the myocardial infarction are caused by a complex interaction of genetic and exogenic (meaning environmental, behavior based and sociocultural) factors. To determine the effect of the so called genetic polymorphism of cardiovascular phenotypes it is reasonable to analyze large homogeneous and accurately characterized populations. Only by using this method even small effects can be detected that contribute to the cause of myocardial infarcts. In such polymorphism-association-studies it is important to record the exogenic factors systematically because they can potentially impact the association between the genotype and phenotype. In this study 3436 patients of the RWTH Aachen university clinic were recruited. They were admitted with the clinical indication of their first intra cardiac catheter without a prior diagnosed coronary heart disease or any other non ischaemic cardiomyopathy and were of the same ethnic background. These patients were divided by age (patients younger than 65 years of age = high genetic influence / patients above 65 years of age = little genetic influence) and for each patient a thorough, cardiological determination of phenotypes was performed using coronary angiography, cineventriculographie and clinical parameters. Furthermore the classical cardiovascular risk factors (CRF = arterial hypertension, diabetes mellitus, hypercholesterolemia and smoking) were recorded and three candidate genes ( Interleukin-6 G-174C, Vitamin C-receptor Bsml and chemokine-receptor-2-V641-genetic polymorphism) belonging to the inflammatory system and therefore important for the pathophysiology of the coronary heart disease were analyzed. Finally a combined analysis of genetic and cardiovascular risk factors with regards to the prevalence of the myocardial infarction by stratification of the patient (potentially high genetic influence versus potential low genetic influence) was made. The myocardial infarction before the age of 65 was defined as a premature myocardial infarction. A significant correlation of individual allele of the genetic polymorphism (VDR BB, Il6 GC/CC, CCR2 VI/II) with high occurrences of myocardial infarctions became evident in the patient group younger than 65 (n= 1946). In our study these polymorphism were defined as genetic risk factors. A combined analysis of the four classic cardiovascular risk factors and the three genetic risk factors showed an additive effect regarding the occurrence of a myocardial infarction. The more risk factors (CRF + GRF; from 0-7) were present, the higher was the prevalence of the myocardial infarction. The patient's age was not associated with the infarcton in this group. In the patient group older than 65 years of age the combined analysis of the CRF risk factors showed only a weak correlation with the prevalence of a myocardial infarction. The examination of the GRF showed no correlation at all. In these patient groups the age was the main parameter for the development of a myocardial infarction. The presented examination allows the conclusion that certain genetic risk factors have an additive -if only a weak – effect on the predisposition of the development of a premature myocardial infarction. The tested genetic risk factors showed no effect on the patient group older than 65 years of age. Due to the very weak detectable effect of the tested genetic polymorphism it remains unclear, which relevance the test of GRF will have in the future and which direction it will take. The currant knowledge does not allow any improvement of the therapy by testing the GRF in the daily clinical routine
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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