1,721,022 research outputs found
Energy and Path-Aware-Reliable Routing in Underwater Acoustic Wireless Sensor Networks
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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
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
Study Of Inhomogeneous Dielectric Resonators For Linearly Circularly Polarized Microwave Antenna Applications
Full text linkIn the last three decades a huge amount research has been dedicated to homogeneous (single permittivity) dielectric resonators (DRs) with cylindrical, rectangular/square and hemispherical shapes being the center of attention. These DRs have been investigated theoretically, numerically, and experimentally therefore, all the major performance controlling parameters are known for the homogeneous DRs. It well known that a homogenous DR can serve only one purpose at a time i.e. strong coupling to the source and hence narrow impedance bandwidth and vice versa. To overcome these drawbacks of homogenous DRs, in this work inhomogeneous DRs are designed in such a way that the basic geometry of the resonator is maintained so that the available theoretical, numerical and experimental analysis tools can be effectively applied to the proposed inhomogeneous DRs. The inhomogeneities in the resonators are introduced systematically in the azimuth (ϕ) direction so that the electromagnetic field distribution in the resonators remains the same with different range of energy confinement. To validate these ideas three different resonators based on cylindrical dielectric resonator (CDR) and rectangular/square shape resonators are investigated. For inhomogeneous CDR two 90ᴼ pie shape sectors of relatively high permittivity were introduced in the ϕ-direction in a way that sectors with same permittivity are placed in the opposite quadrant. Similarly, another inhomogeneous DR (split-oval shape) was designed by inserting high permittivity rectangular strip in the middle of two half cylindrical DR in the ϕ direction. Lastly, the third design of
this research is based on a square shape DR in which the permittivity is lowered by introducing air-gap within the resonator which appears like a nested square DR. The proposed inhomogeneous DRs are tested for linearly polarized (LP) wideband antenna applications with a common excitation technique i.e. microstrip line. While, for circularly polarized (CP) designs, it is important to excite two orthogonal modes with the same amplitude hence different feeding techniques are used. Theoretical, numerical and experimental analysis of the inhomogeneous dielectric resonator antennas (DRA) showed that by properly designing inhomogeneous resonators, impedance bandwidth response, axial ratio (AR) bandwidth, gain and efficiency of the DRA‘s can be improved. For all three inhomogeneous LP DRA‘s approximately 56% impedance bandwidth was achieved which shows 80.5% enhancement of bandwidth over homogeneous DRAs with stable radiation characteristics throughout the operating band. The AR bandwidth response of the CP inhomogeneous DRA‘s was recorded to be 200% more than that of homogeneous counterparts. For the first two inhomogeneous DRAs gain was improved up to 6.5 dBi while for the nested square DR gain remained almost the same as that of the homogeneous square DR. With reference to these findings it was found that performance of the DRA can be noticeably improved with systematic introduction of inhomogeneity in the DR
Broadband Dual-Segment Rectangular Dielectric Resonator Antenna For 5.8 Ghz Applications
Full text linkAntena Penyalun Dielektrik (APD) jalur lebar adalah satu antenna yang boleh memancar dan menerima signal elektromagnetik dalam julat frekuensi yang lebar untuk telekomunikasi berkapasiti tinggi. Bahan-bahan dielektrik dengan ketelusan dan faktor kualiti yang rendah boleh menyimpan kurang tenaga elektromagnetik dan seterusnya mengalami gandingan lemah daripada sumber teruja. Sebaliknya bahan-bahan dengan ketelusan tinggi mempunyai fakfor kualiti dan medan elektrik dan magnetik tinggi boleh terhasil dalam penyalun, seterusnya boleh beroperasi dalam lebar jalur sempit dengan gandingan yang kuat. Untuk APD yang mempunyai gandingan elektromagnetik kuat dimana boleh beroperasi dalam julat frekuensi yang lebar, dua bahan ketelusan yang berbeza digunakan untuk merekabentuk antenna. Bahan dielektrik berbentuk segiempat tepat digunakan untuk kedua-dua segmen APD kerana mod kemerosotan boleh dikawal dengan memilih nisbah aspek yang sesuai dalam penyalun. Untuk segmen atas penyalun lapis dielektrik gelombang mikro Roger RT 6010 dari Roger Cooperation digunakan sebagai penyalun utama. Untuk segmen bawah yang bertindak sebagai pengubah galangan, diantara segmen atas dan talian suapan, dua bahan dielektrik yang berbeza iaitu Barium Zinc Tantalum (BZT) dan Calcium Copper Titanate (CCTO) dibina. Untuk antena unsur tunggal dan antena dua unsur teratur BZT digunakan sebagai pengubah manakala untuk empat unsur dan lapan unsur antena teratur CCTO digunakan bagi mengawal gandingan sepunya diantara penyalun terdekat
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