1,720,990 research outputs found
Special issue on Advances in Interferometric Synthetic Aperture Radar Processing: Editorial
No full textSynthetic aperture radar (SAR) is a powerful mature technique
providing unique high-resolution two-dimensional
radio reflectivity images, representing the electrical and geometrical
properties of a surface in nearly all weather nightand-
day conditions. Range resolution is obtained through
signal modulation, while platform motion and synthetic
aperture processing allow azimuth resolution. Accuratemeasurement
of radio reflectivity is very useful for vegetation
and snow mapping, forestry, land-use monitoring, agriculture,
soil moisture determination, mineral exploration, and
for oceanography, hydrology, and geophysics.
Interferometric methods, based on further information
extraction from the phase difference among at least two
complex-valued SAR images, have successfully expanded in
the last two decades the remote sensing capabilities of SAR.
Depending on the acquisition configuration, SAR interferometry
can provide efficient operational topographic mapping
or displacement monitoring tools for land and ice applications.
Sensitivity to topography with decimeter (from
aircraft) to meter (from satellite) accuracy is obtained by the
cross-track interferometric configuration, where the SAR acquisitions
are separated by a baseline orthogonal to the platform
flight path. Cross-track interferometry is finding many
applications in remote sensing fields where digital elevation maps (DEMs) are useful, for example, for topographic and
urban mapping, geophysics, forestry, hydrology, glaciology,
siting for cell phones, and flight simulators. Sensitivity to
small surface displacements, of the order of a few millimeters,
is obtained by the configuration of differential interferometry,
exploiting time acquisition diversity on long (days
to years) time scales. Differential interferometry is an established
technique for analyzing ground displacements of tectonic
nature, for monitoring volcanic areas and slope instabilities,
as well as for capturing precursor displacements to
building collapses. Another promising SAR interferometry
mode allows also ocean surface (or moving vehicle) velocity
sensing. This mode is termed along-track interferometry,
since it exploits SAR acquisitions separated by a baseline
aligned with the platform flight path. It can be regarded as
a differential interferometry technique acting on short (fraction
of second) time scales to measure decimeter-to-meterper-
second velocities. Further details on the various interferometric
SAR techniques and their applications can be found
in the tutorials papers [1, 2]. The need for advanced signal processing techniques
within the interferometric SAR processing field is continuously
increasing, for improving existing interferometric
functionalities, producing novel parameter extraction capabilities, and fully exploiting the rich SAR data archives
and the potentials originated by new experimented and
planned interferometric SAR sensors (multi-baseline airborne
and minisatellite cluster systems). Observing this
trend, we have put together this special issue. All of the submitted
papers went through peer reviews to ensure their
correctness, technical significance, and relevance to the special
issue. It consists of ten papers on the development of
advanced models and new signal processing algorithms in
the interferometric SAR field, with an approach mainly oriented
towards the exploitation of statistical methods and
of baseline/time/frequency/polarization acquisition diversity,
to face the challenges of an accurate, reliable, and fully
capable interferometric radar remote sensing and to deal
with increasingly various and difficult scenarios. In particular,
the papers concern the fertilization with, and application
of, methods and concepts from the areas of filtering, parameter
estimation, spectral estimation, array processing, coherent
data fusion, model inversion, detection, and physicalbased
statistical modeling. System performance analysis and
fuzzy signal processing are also tackled.
The papers are categorized into four interferometric topics:
cross-track interferometry, differential interferometry,
polarimetric interferometry, and along-track interferometry
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
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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