1,721,018 research outputs found
Using Clustered Climate Regimes For
No full textspect to the N charac- Corresponding author address: Forrest M. Hoffman, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831--6036 USA; e-mail: [email protected] Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract number DE--AC05--00OR22725. Matter Organic 1 2 3 4 5 6 A B C D E G H C B E FG H 4 2 1 Temperature Organic Matter Rainfall Perform multivariate clustering. non-hierarchical statistical 1 3 4 2 Cluster Bins F2 H1 D6 E4 D5 C6 B7 A8 A6 F8 G8 G7 variables become axes of the data space. Map cell values become coordinates for the respective axis. Descriptive Group map cells with similar values for these descriptive variables. space and color them according to their cluster number. Reassemble map cells in geographic Temperature H1 Temperature G7 H1 Rainfall Geographic Space Data Space D5 D6 E4 F2 G8 F8 E6 C6 B7 A8 A6 Figure 1: The Multiv
Multivariate Spatio-Temporal Clustering of Time-Series
No full textding author address: Forrest M. Hoffman, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831--6036 USA; e-mail: [email protected] Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract number DE--AC05--00OR22725. Matter Organic 1 2 3 4 5 6 A B C D E G H C B E FG H 4 2 1 Temperature Organic Matter Rainfall Perform multivariate clustering. non-hierarchical statistical 1 3 4 2 Cluster Bins F2 H1 D6 E4 D5 C6 B7 A8 A6 F8 G8 G7 variables become axes of the data space. Map cell values become coordinates for the respective axis. Descriptive Group map cells with similar values for these descriptive variables. space and color them according to their cluster number. Reassemble map cells in geographic Temperature H1 Temperature G7 H1 Rainfall Geographic Space Data Space D5 D6 E4 F2 G8 F8 E6 C6 B7 A8 A6 Figure 1: The Multivariate Geographic Clustering (MGC
Statistically Determined Global Fire Regimes (GFRs) Empirically Characterized Using Historical MODIS Hotspots
No full textStatistically Determined Global Fire Regimes (GFRs) Empirically Characterized Using Historical MODIS Hotspots
Fire regimes are areas having similar fire characteristics, and show the spatial pattern, frequency and intensity of fires that prevail in that area over long periods of time. Fire regimes are created and maintained by multivariate interactions between climate, vegetation/fuels, and ignitions. Like ecoregions, fire regimes indicate the extent and overlap of particular vegetative/fuel communities and climatic conditions, and are important for understanding, monitoring, predicting and managing fire.
More than 83M MODIS “hotspot” thermal detections from 2002-2019 were grouped into 10km cells, and 21 derived variables describing fire characteristics of fire intensity, return frequency, and seasonality within each cell were developed and subjected to unsupervised Multivariate Geographic Clustering to produce world maps of Global Fire Regimes (GFRs), each having similar fire intensity and timing characteristics.
Methodology behind these datasets are described in manuscript currently in review.
W. W. Hargrove, Jitendra Kumar, Steven P. Norman, Forrest M. Hoffman (2022), "Empirical Characterization of Global Fire Regimes Show Shared Fire Relationships" 2022 (in review)
This data collection includes:
1. Multivariate Geographic Clustering Global Fire Regimes at 3000, 1000, 500, 100, 50, 20, 10 levels of divisions in form of geospatial raster in IMG formats, and associated color tables.
2. Characteristics of GFRs
3. Location groups
4. Geospatial maps of global fire frequency modes, global seasonality strength, and 12 types of global fires.
5. PNG maps for all data products
6. Description and script for global date transform algorithm
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
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