1,720,968 research outputs found
Innovative Strategy for Vehicle Position Certification on the basis of GNSS reference time
No full text
Assessment Study of Navigation and Communication Terminal-Based Hybrid Positioning
No full textSoftware based cellular location systems for accurately determining the location of
a wireless cellular device is becoming one of the key dierentiator in an increasingly
crowded personal communication market. New location-based services are the long
awaited killer application for the wireless industry, according to analysts. Current
and future development plans foresee that providers can deliver location-based ser-
vices to standard mobile phones and that the users through their wireless hand-set
can now accurately locate themselves and tap into new applications like mobile yel-
low pages, concierge services, roadside assistance, location sensitive billing, personal
navigation and tracking services. In US, the development of these services is be-
ing encouraged by the FCC E-911 mandate, all US wireless operators will begin to
provide the location of mobile emergency callers to safety ocials and emergency
dispatchers. There are many regulators in other countries worldwide that are be-
ginning to explore mandating wireless location in this way too, including Europe
[1].
In this paper we show how, providing the users of terminals able to deal jointly
with GNSS signals and cellular positioning signals it possible to improve the geometrical Dilution of Precision related to the navigation solution. A theoretical
framework is dened in order to deal with the hybrid localization system, and
simulation results are presented
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
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