1,720,954 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
Biomechanical mechanisms of rotator cuff deformation during a simulated Volleyball spike
No full textUniversity of Minnesota Ph.D. dissertation. 2025. Major: Rehabilitation Science. Advisor: Paula Ludewig. 1 computer file (PDF); xi, 165 pages.Background: Shoulder pain accounts for hundreds of thousands of surgeries each year and contributes to enormous healthcare spending. Rotator cuff disorders are the primary driver of physician visits for shoulder pain. Despite this, consistently successful treatment for rotator cuff disorders has been elusive. Rotator cuff repair demonstrates high failure rates and recurrent or ongoing pain is common with nonoperative management including physical therapy. Taken together this suggests a lack of complete understanding of the biomechanical demands on the rotator cuff and the role of complex mechanical stress and strain on rotator cuff disorders. Volleyball players’ spiking shoulders are exposed to repetitive spike motions in high humeral elevation angles known to contribute to rotator cuff compression. Additionally, they experience large angular velocities at extremes of axial rotation during arm cocking and acceleration—positions commonly linked to various glenohumeral joint pathologies. Sports biomechanics research of the shoulder is dominated by optical, and to a lesser extent, electromagnetic motion capture which are limited by skin motion artifact and often ignore contributions of the scapula.
Deformation of the rotator cuff tendons is related to the position and orientation of their bony origins and insertions—information lost without accurate scapular kinematics. Biplanar videoradiography is a precise tool that has been successfully employed to describe glenohumeral kinematics and elucidate normal mechanisms of rotator cuff compression during reaching tasks. However, high-speed, multiplanar shoulder movements have not been pursued due to limitations in capture frequency and field of view. Detailed glenohumeral kinematics during the multiplanar volleyball spike would provide unique information on normal deformation of commonly injured rotator cuff tendons and critical boundary conditions to constrain future modeling studies of rotator cuff behavior which is infeasible to measure directly in vivo.
Objectives: The objectives of this dissertation were three-fold: (1) to determine the effect of velocity control on humerothoracic kinematics of a simulated volleyball spike; (2) to describe glenohumeral kinematics of a simulated volleyball spike; and (3) determine the extent to which foregoing kinematics contribute to compressive deformation of the rotator cuff as compared to scapular plane abduction.
Methods: The objectives of this dissertation were approached through two separate studies. First, I needed to determine the feasibility of capturing high-speed, multiplanar glenohumeral kinematics within the constraints of our custom biplanar videoradiography system. To do this, I chose to examine if humerothoracic kinematics during the arm cocking phase of high-speed spiking were similar to those observed at reduced velocities. Optical motion capture was used to obtain humerothoracic kinematics from 11 recreational volleyball players without shoulder pain during simulated volleyball spikes at high speed and under two velocity conditions regulated by a metronome. Elevation, plane of elevation, and axial rotation were extracted at the instant of maximum external rotation and were compared within-subjects across conditions using a repeated measures analysis of variance.
A custom biplanar videoradiography system was then employed to assess glenohumeral kinematics of 21 competitive volleyball players during scapular plane abduction and a simulated volleyball spike. Subject-specific bone models were segmented from CT scans of the scapula and humerus. 2D-3D shape matching was employed to iteratively match digitally reconstructed radiographs of the scapula and humerus to biplanar image projections for each frame. Glenohumeral joint rotations, translations, combined supraspinatus/infraspinatus tendon footprint-to-acromion (subacromial), and tendon footprint-to-glenoid (internal) proximities were extracted and described for scapular plane abduction and a simulated volleyball spike. Lastly, glenohumeral kinematics and tendon footprint-to-bone proximities were isolated at the instant of arm cocking of the simulated volleyball spike and compared to scapular plane abduction at an equivalent elevation angle using paired t-tests. This is the first study to employ biplanar videoradiography to directly visualize the GH joint during a dynamic sporting activity. The additional GHER that occurs during late cocking as compared to SAB at an EEA appears to convey a protective mechanism against SA impingement.
Results: For the surface motion capture study there was no significant difference in mean humerothoracic elevation (F1.13,10.2 = 0.68, p = 0.45) nor plane of elevation (F2,20 = 0.25, p = 0.78) at the instant of arm cocking across velocity conditions. Mean maximum humerothoracic external rotation was significantly different across velocity conditions (F1.29,12.86 = 5.44, p = 0.03). After adjusting for multiple comparisons, mean maximum ER was significantly less for the 75 BPM (mean maxER = 87.4°) as compared to the 175 BPM and full speed conditions (mean maxER = 100.1° and 107.3°; p = 0.011 and p = 0.04) respectively.
In the biplanar videoradiography study, glenohumeral external rotation (ER) was significantly greater (mean difference = 28.94°, p < 0.001) and subacromial proximity was significantly larger (i.e. more space) during arm cocking of the simulated spike as compared to scapular plane abduction (mean difference = 3.12 mm, p < 0.001) at an equivalent elevation angle. Internal impingement proximity (mean difference = -1.94 mm, p = 0.15), plane of elevation (mean difference = -11.27°, p = 0.07), and glenohumeral SI, AP, and ML translations were not significantly different between tasks (Superoinferior mean difference = -0.007 mm, anteroposterior mean difference = 0.293 mm, and medial-lateral mean difference = 0.002 mm; p = 0.98, p = 0.46, and p = 0.99 respectively).
Conclusions: Feasibility of using biplanar videoradiography to capture fast speed glenohumeral kinematics needed to be established to justify its associated radiation exposure to participants. I found that humerothoracic elevation and plane of elevation angles at arm cocking were consistent across fast-speed and two velocity-controlled conditions; however, axial external rotation was underrepresented at slower speeds. I felt these results supported the use of biplanar videoradiography for more precise kinematic characterization of the glenohumeral joint. Specifically, elevation angle was unchanged across velocity conditions and it is an established kinematic contributor to rotator cuff compression. Researchers should be aware that glenohumeral external axial rotation may be underrepresented in velocity-controlled conditions. Clinically, movement velocity control via metronome is a low-cost tool to provide progressive exposure to increasing external rotation during simulated spike tasks.
This is the first study to employ biplanar videoradiography to directly visualize the glenohumeral joint during a dynamic sport activity. Both tasks involved periods of time where most participants were at risk of both subacromial and internal rotator cuff compression. The additional glenohumeral external rotation during the arm cocking phase of a simulated spike may convey a protective mechanism against subacromial compression as compared to scapular plane abduction.Hellem, Aaron. (2025). Biomechanical mechanisms of rotator cuff deformation during a simulated Volleyball spike. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/278742
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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