1,720,991 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
Flexible optical network components based on densely integrated microring resonators
Full text linkThis thesis addresses the design, realization and characterization of reconfigurable optical network components based on multiple microring resonators. Since thermally tunable microring resonators can be used as wavelength selective space switches, very compact devices with high complexity and flexibility can be created. In chapter 1 an introduction to this thesis is given by stating the context in which the work has been done. A brief overview of optical communication networks is given as well as a description of the projects in which the research has been carried out. Finally the basic properties of microring resonator filters are presented, like the Free Spectral Range and Finesse. In chapter 2 an application oriented top-down design approach for the microring resonator as wavelength filter is described. A scattering matrix model of a MR is used, that incorporates the coupling constants, radius and the losses. With this model the geometrical design parameters are investigated and chosen such that the network specification can be met. It comes out that for high bandwidth filtering applications the coupling constants need to be relatively large. Furthermore for a MR which drops as much power as possible, the coupling constants need to be equal. Physical layer simulations of the MR in a network environment are done that confirm the high bandwidth filtering application. In chapter 3 the thermal properties of a microring resonator are described. These properties allow the filter to be tuned to a specific wavelength. This way switching functions can be realized and fabrication errors and environmental temperature changes can be corrected. The basic properties of thermal tuning are explained, whereafter the design and characterization of a thermally tunable single ring is given. Several SiO2/Si3N4 MRs with chromium -shaped heaters were fabricated. The MRs show good reproducibility and the parameters extracted from measurements show good agreement with the designs. A thermal tunability between 11.3 pm/mW and 20 pm/mW for several different geometries is demonstrated. A method of increasing the switching speed is described, that uses an overshoot and bias of the driving signal. By using this method the rise-time of the MR response was improved by 42%, enabling modulation frequencies of 10 kHZ and switching speeds in the order of 0.1 ms. Chapter 4 is describing the use of devices built out of more than one single MR to create complex structures with enhanced functionality. Some examples of these complex structures are described, like an optical-cross-connect, a reconfigurable wavelength router and an optical network unit. The multiple MR structures are compared to their competing technologies and it is calculated that the used area can be reduced with a factor of 50 by using complex MR functions. Some examples of fabricated and measured structures based on multiple MRs are given. First a wavelength selective switch is demonstrated which has an ON/OFF ratio of 12 dB and a channel separation better than 20 dB. Second, a Vernier switch is shown which has a total Free Spectral Range of 28 nm, by combining the specifications of two rings. Finally a reconfigurable optical add-drop multiplexer is demonstrated which is made out of four MRs and which is pigtailed and packaged. It demonstrates a symmetric add and drop response with 17 dB resonance peaks. Since the tuning range of the rings is larger than the Free Spectral Range of the rings, any wavelength can be addressed. A single channel configuration could be reached by only 20 mW of driving power. A four channel configuration uses 446 mW of driving power. Chapter 5 gives system level measurements in order to assess the performance of multi MR based structures in optical networks. It describes the system level characterization methods, - setups and the measurements on both single MR as well as multiple MR structures for 10 and 40 Gbit/s datasignals. The results show that 10 Gbit/s non-return-to-zero datasignals can be filtered by the described MR as a clear eye diagram is measured. A measurement of the groupdelay confirms this also since the delay of 7 ps does not contribute significantly at this datarate. The 40 Gbit/s return-to-zero measurement results show that the reconfigurable add-drop multiplexer can filter these signals with clear eye diagrams to all add and drop ports. A power penalty of 1 dB was measured at a bit-error-rate of 10−9. The measurements also demonstrate the principle of multicasting the 40 Gbit/s signals to more than one output port at once. Finally, in chapter 6, a discussion is given of the results presented in this thesis and of the use of MRs in optical telecommunication components. This discussion will lead to the conclusion that it is possible to design and realize multiple MR devices allowing high bitrate optical network components with reconfigurable functions. The chapter also gives an outlook recommending future research for multi MR structures in optical telecommunications components. In this context also some brief comments on recent picosecond pulse measurements are given, where pulses with a length in the order of the round-trip time of the MR are filtered
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
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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