1,721,554 research outputs found
KM3NeT Acquisition Control: advanced techniques and best practices in data acquisition software development
No full textThe Control Unit of the KM3NeT Data Acquisition is the software suite that is respon-
sible for operating all the components of the KM3NeT telescopes in a coordinated and scientifically
proficient way. It controls a wide span of parameters and procedures, from the power supplies, to
the operating voltages of more than 64000 photomultipliers in each detector block, to the setup of
the various trigger algorithms that are applied online. The same software suite is also designed to be
used in all test and qualification benches, from single Digital Optical Modules to full Detection Units.
As the KM3NeT detectors are being incrementally built, the Control Unit is employed in a variety
of setups and configurations, and is a dynamic software project, still adapting to shifting needs.
The conflicting requirements of flexibility and stability are reconciled by proper code develop-
ment policies. The Control Unit is able to cope with dynamically changing scenarios of multiple
firmware generations coexisting in the same detector, for various reasons including hardware com-
patibility as well as testing purposes. The code also allows for static verification and extensive unit
tests.
A Central Logic Board Simulator software was also developed to help testing the whole
architecture. Such a simulator provides properly faked slow control parameters, features a fully
specification-compliant state machine and can generate fake data with specific profiles to feed the
Trigger and Data Acquisition System. In this way, offline integration tests can be executed at each
new software release, ensuring their smooth deployment to production sites and minimising chances
of mistakes by operators
The software defined networks implementation for the KM3NeT networking infrastructure
Full text linkThe Software Defined Networks technology is used to configure and operate the core of the switch fabric of the networking system of the KM3NeT shore infrastructures. It is organised according to a star-center layout, interconnecting all the on-shore resources. The used switches are DELL Series S devices, compatible with the OpenFlow 1.3 protocol and managed by dedicated Open-Daylight 4.2 (Beryllium) controller servers. With a limited number of Layer 2 forwarding rules, expressly developed for the KM3NeT use-case, which keeps independent from any scaling of the off-shore detector, the SDN technology allows the best handling of the KM3NeT asymmetric network topology, optimising the layout of connections on shore, preventing loops and enhancing the data taking stability
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
The Sun shadow observation with the ANTARES neutrino telescope
No full textThe ANTARES detector is an abyssal undersea neutrino telescope in the Mediterranean Sea. The search for point-like neutrino sources is one of the main goals of ANTARES, so a reliable way to evaluate the detector angular resolution and pointing accuracy is needed. In a previous analysis, the deficit in the atmospheric muon flux in the direction of the Moon induced by absorption of cosmic rays was investigated. It has allowed the estimation of the angular resolution and of the pointing accuracy of the detector. In this work the same approach was applied to measure the Sun shadow effect. This analysis is based on the ANTARES data taken in the interval between 2008 - 2015. According to Monte Carlo simulation the expected statistical significance of the analysis is 2.9s
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
The Sun shadow observation with the ANTARES neutrino telescope
No full textThe ANTARES detector is an abyssal undersea neutrino telescope in the Mediterranean Sea. The search for point-like neutrino sources is one of the main goals of ANTARES, so a reliable way to evaluate the detector angular resolution and pointing accuracy is needed. In a previous analysis, the deficit in the atmospheric muon flux in the direction of the Moon induced by absorption of cosmic rays was investigated. It has allowed the estimation of the angular resolution and of the pointing accuracy of the detector. In this work the same approach was applied to measure the Sun shadow effect. This analysis is based on the ANTARES data taken in the interval between 2008 - 2015. According to Monte Carlo simulation the expected statistical significance of the analysis is 2.9σ
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