1,720,998 research outputs found
Landslide state of activity maps by combining multi-temporal A-DInSAR (LAMBDA)
No full textIn this paper, a new methodology was developed to automatically update Landslide state of Activity Maps by
combining multi-temporal A-DInSAR data (LAMBDA). LAMBDA procedure was tested using ERS-1/2
(1992–2000), Radarsat-1/2 (2003–2009) and COSMO-SkyMed data (2011–2014) over an area of 2199 km2
located in Alps context of Piedmont region (north-western Italy). For the first time, a multidimensional landslide
activity matrix was implemented to update the landslide state of activity during the monitored time span. For the
definition of the state of activity, the representative velocity of each landslide was divided by the standard
deviation of the velocities along the slope of the whole dataset. Thus, a common stability threshold of±1 was
introduced for multi-sensors A-DInSAR data, allowing to distinguish a phenomenon with stable targets (PS-DS)
or unstable PS-DS. By combining activity classes estimated during different time spans allows to determine if a
phenomenon is active, reactivated, or dormant. Furthermore, an innovative confidence degree assessment was
carried out to verify the reliability of the procedure, by considering the measuring points distribution and the
variability of the movements for each landslide. The results were validated using the landslide inventory of the
study area and in-situ monitoring systems for representative case studies. Thanks to this approach an updated
state of activity until 2014 was assigned to 507 landslides out the 1657 which were previously mapped in the
study area
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
A methodology for ground motion area detection (GMA-D) using A-DInSAR time series in landslide investigations
No full textIn recent years, the Advanced Differential Interferometric Synthetic-Aperture Radar (A-DInSAR) technique has
advanced rapidly for detecting and monitoring ground surface deformations due to landslides. Identification of
the areas affected by ground motion through A-DInSAR data is generally based on visual inspection and hotspot
or cluster analysis of average displacement rates. However, interpreting A-DInSAR time series of a particular
area can provide a better indication of the real trend of displacement of a landslide, while identifying the
possible moment of acceleration of the deformation process as well. In this work, a novel methodology is proposed
for identifying different typologies of ground motion areas mainly related to landslide phenomena at a
regional scale, by means of A-DinSAR data at high spatial and temporal resolutions. This methodological approach
was tested and validated in a wide area of the Piedmont region (northern Italy), by means of RADARSAT
and COSMO-SkyMed satellite data, in both ascending and descending modes. These sensors have a high spatial
resolution, allowing investigation of a higher number of landslides as compared to that of the older ERS-1/2 and
Envisat data. Linear (constant in time displacement) and non-linear (acceleration or deceleration in the displacement
rate) trends were recognised, allowing characterisation of the kinematic pattern of a landslide or a
portion of it. Local and site-specific scale analyses, performed in an Alpine valley and in two hillslopes representative
of the main geological/geomorphological contexts of the study area, validated the results obtained
at the regional scale. This supported the interpretation of the driving mechanism for such known landslides, or
other geological processes which can cause ground motion along slopes. The developed procedure can allow one
to specify priority areas for prevention activities, in order to optimise the costs and benefits of designing a plan to
monitor instability phenomena at regional and site-specific scale
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