1,720,999 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
Trace inequalities for Sobolev martingales
Full text linkWe study limiting trace inequalities in the style of Maz'ya and
Meyers--Ziemer for Sobolev martingales. We develop the Bellman function
approach to such estimates, which allows to provide sufficient and almost
necessary conditions on the martingale space and the martingale transform under
which the trace inequalities hold trueComment: 26 page
Maz\u27ya\u27s -inequalities on domains
Full text linkWe find necessary and sufficient conditions on the function for the inequality to be true. Here is a positively homogeneous of order , possibly vector valued, kernel, is a -homogeneous function, and . The domain is either bounded with smooth boundary for some or a halfspace in . As a corollary, we describe the positively homogeneous of order functions that are suitable for the bound 15 page
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
Essays on International Economics
No full textThis dissertation consists of three independent essays on international economics. First, I examine how the geographic distribution of innovation determines aggregate productivity. Second, I study how culture matters for production networks and its aggregate implications. Lastly, I focus on how the complementarity of suppliers for production matters for the amplification of negative shocks through production networks.
The first chapter of this dissertation studies the role of spatial knowledge spillovers in R&D for innovation, and therefore on aggregate productivity. I causally estimate spatial knowledge spillovers in Research and Development (R&D) and quantify their importance for R&D policies. Using a new administrative panel on German inventors, I estimate these spillovers by isolating quasi-exogenous variation from the arrival of East German inventors across West Germany after the Reunification of Germany in 1990. I then embed the estimated spillovers into a spatial model of innovation, and use it to quantify the productivity gains from implementing policies that promote R&D activities. The model predicts that reducing migration costs for inventors and R&D subsidies lead to substantial productivity gains. Finally, these productivity gains increase with the degree of spatial knowledge spillovers in R&D.
The second chapter, co-authored with Gaurav Khanna and Hiroshi Toma, examines how cultural proximity shapes production networks, and how it affects welfare. We combine a new dataset of firm-to-firm trade for a large Indian state with information on cultural proximity between firms derived from India's caste and religious classifications. We find that larger cultural proximity between a pair of firms reduces prices and fosters trade at both intensive and extensive margins. We argue that these results are driven by increasing trust between firms due to their cultural proximity, which in turn solves contracting frictions. Guided by these stylized facts, we propose a firm-level production network model, where cultural proximity influences trade and matching costs. Our counterfactual exercises indicate that social inclusion policies raise welfare, and reducing contracting frictions increases welfare via the channel of trade becoming less reliant on cultural proximity.
The third chapter, co-authored with Devaki Ghose and Gaurav Khanna, studies the aggregate implications of firm-level elasticities of substitution across suppliers. We continue using this firm-to-firm trade for a large Indian state, and leverage geographic and temporal variation from the Covid-19 lockdowns in India to estimate these firm-level elasticities of substitution across suppliers of the same product, and quantify the fall in trade. If suppliers are complements rather than substitutes in production, this shock can amplify by further transmitting downstream and upstream through the supply chain. We find that even at this very granular supplier level, suppliers are highly complementary. We use our elasticities and simulate the impact of the Covid-19 lockdowns to find that under our estimated elasticities, the overall fall in output is substantial and widespread, and to show the importance of targeted policies during economic downturns according to firm size and connectedness.PhDEconomicsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/176631/1/bcfujiy_1.pd
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
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