1,721,063 research outputs found
Reliability of two REMUS-100 AUVs based on fault log analysis and elicited expert judgment
Get PDFReliability is especially important for autonomous
underwater vehicles (AUVs) that have made the transition
to operational use. However, in contrast to the unmanned
air vehicle community, there has been little sharing in the
open literature of detailed fault histories of commercial
AUVs from which an assessment of their reliability can be
made. In this paper, we declare the fault history of two
REMUS-100 AUVs manufactured by Hydroid Inc. and
operated by the Center for Coastal Marine Sciences at
California Polytechnic State University. The data set
contains the faults and incidents recorded from 186
missions between 5 November 2003 and 14 January 2009.
Interaction between the faults or incidents with the AUV
and the operating environment complicate matters when
it comes to estimating probability of loss. Through a
formal process of eliciting expert judgment the paper
provides optimistic and pessimistic estimates of loss of
the REMUS vehicles in open water, coastal, under sea ice
and under ice shelf operations. Vehicle-specific risk
mitigation methods are explored, and recommendations
made for reviewing the fault history data using
behavioural aggregation through interaction among a
group of experts rather than simple mathematical
aggregation as in this paper
Oligonucleotide primers for the detection of bioluminescent dinoflagellates reveal novel luciferase sequences and information on the molecular evolution of this gene
Get PDFBioluminescence is reported in members of 18dinoflagellate genera. Species of dinoflagellates areknown to have different bioluminescent signatures,making it difficult to assess the presence of particularspecies in the water column using optical tools, particularlywhen bioluminescent populations are in nonbloomconditions. A ‘‘universal’’ oligonucleotideprimer set, along with species and genus-specificprimers specific to the luciferase gene were developedfor the detection of bioluminescent dinoflagellates.These primers amplified luciferase sequencesfrom bioluminescent dinoflagellate cultures and fromenvironmental samples containing bioluminescentdinoflagellate populations. Novel luciferase sequenceswere obtained for strains of Alexandrium cf. catenella(Whedon et Kof.) Balech and Alexandriumfundyense Balech, and also from a strain of Gonyaulaxspinifera (Clap. et Whitting) Diesing, which producesbioluminescence undetectable to the naked eye. Thephylogeny of partial luciferase sequences revealedfive significant clades of the dinoflagellate luciferasegene, suggesting divergence among some species andproviding clues on their molecular evolution. We proposethat the primers developed in this study willallow further detection of low-light-emitting bioluminescentdinoflagellate species and will have applicationsas robust indicators of dinoflagellatebioluminescence in natural water samples
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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