1,720,956 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
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
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
VALUE OF INFORMATION (VOI) OF GEOPHYSICAL DATA FOR GEOTHERMAL EXPLORATION
No full textThe objective of this thesis is to present a value of information (VOI) analysis of seismic data that uses a machine learning technique for deriving the required Bayesian statistics. The VOI methodology evaluates the benefit of acquiring additional information, by means of data collection activities, before making a decision with uncertain outcome.
VOI analysis is studied here in the decision context of a geothermal drilling project in which the decision considered is whether to drill the production well or leave the field. Considered the significant uncertainty associated to the exploration of geothermal resources and the high cost of a geothermal drilling operation, it is fundamental to carry out extensive investigations to get a measure of the availability of the resource and the economic potential of the project. One possible way to assess the value of data collection activities is value of information analysis.
VOI calculations must be performed before collecting the data, so that the decision maker evaluates if the information to be gathered could have a significant impact on the decision (drilling a well in this case) and if it’s worth to invest in the survey by comparing the VOI result with the cost of the acquisition.
For the VOI example proposed in this thesis, a seismic reflection survey is simulated to assess the impact of acquisition geometry on the reliability of seismic imaging and, in particular, of the imaging of major faults within the reservoir. Having knowledge of the fault locations in the subsurface when exploring for geothermal resource is crucial since fault systems highly affect the production and recharge of geothermal fluids. The VOI quantitatively evaluates the potential value that the information gathered by seismic data could add to the decision context.
The first task was to build synthetic P-wave velocity, S-wave velocity and density models based on data, reported in the literature, related to the geothermal field at Larderello (Italy). Seismic velocity and density values across the model are needed to generate the synthetic data through a two-dimensional elastic forward modelling. From the simulated measurements, 2D seismic images were produced through reverse time migration (RTM).
To investigate how well faults can be resolved in the migrated images, a convolutional neural network (CNN) is applied to detect faults within the images and to provide the reliability measure needed for deriving VOI. The reliability is expressed by the posterior probability that quantifies how frequently the predicted faults within the migrated image will match the actual presence of faults and vice versa. The CNN applied to perform the fault binary segmentation task is the FaultSeg3D model, developed by Wu et al. (2019). The network is fed with 3D seismic images and it outputs a fault probability map (probabilities between 0 and 1) which has the same size of the input seismic images.
The FaultSeg3D model has been re-trained after creating a new synthetic training dataset composed of 251 3D seismic images and their corresponding fault labels with the size of 128x128x128 and a validation dataset of 26 seismic and fault labelled volumes of the same size. Although the CNN was trained by using synthetic images created with a different workflow, the training leads to satisfactory prediction performance of fault locations when applied to migrated images.
The quantities of correct/incorrect interpretations are used to derive likelihoods and posterior probabilities for VOI calculations. The value of information analysis not only takes into account the reliability of the information (interpreted faults), but also the prior uncertainty about the faults presence in the investigated subsurface and the economic possible outcomes of the decision in case of a successful/dry well.
The VOI was analytically calculated by assuming a discrete prior probability and Net Present Value (NPV) of the geothermal project. Then, the calculation is done in the cases of different scenarios for the following parameters: reliability of the information, prior probability and economic impact of the decision (NPV) to evaluate how they could affect the results.
Wu, Xinming, et al. "FaultSeg3D: Using synthetic data sets to train an end-to-end convolutional neural network for 3D seismic fault segmentation." Geophysics 84.3 (2019): IM35-IM45
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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