1,720,956 research outputs found
Preface
No full textThese proceedings contain the papers presented at the 9th International SpaceWire and SpaceFibre Conference, held in Pisa, Italy between 17th and 19th October 2022. This Conference brings together international spacecraft engineers and academics who are working on spacecraft on-board datahandling technology. It is of benefit to product designers, hardware engineers, software engineers, system developers and mission specialists, enabling them to share the latest ideas and developments related to SpaceWire and SpaceFibre spacecraft on-board network technologies.
SpaceWire is now being used or designed into well over one hundred spacecraft, covering science, exploration, Earth observation and commercial applications. High profile missions like James Webb Space Telescope, GAIA, ExoMars, BepiColombo, Sentinels 1, 2, 3 and 5 precursor, and GOES-R are using SpaceWire extensively. SpaceWire is being used in Europe, Japan, USA, Russia, China, India, and other countries of the World.
SpaceFibre is the next generation of SpaceWire technology, offering higher data-rates and substantially enhancing the capabilities of SpaceWire. It runs over electrical or fibre optic cable covering distances of 5m and 100 m respectively while running at lane speeds of up to 6.25 Gbit/s currently in radiation tolerant technology. The multi-lane link capability of SpaceFibre results in link speeds of 25 Gbit/s for a quad-lane link with up to 16 lanes per link being possible. Higher lane speeds are also possible. SpaceFibre is not only very fast, it incorporates quality of service, providing multiple independent virtual networks for transferring information over the physical network, each virtual network having its own priority, bandwidth allocation and schedule. These capabilities enable SpaceFibre to provide deterministic data delivery without loss of network bandwidth for combined control and payload data-handling networks. It also provides integrated, rapid fault detection, isolation and recovery technology, which makes SpaceFibre a highly robust network for use in applications where reliability and availability are critical.
The conference covers many different aspects of SpaceWire and SpaceFibre, and includes both academic and industrial presentations. Sessions cover standardisation, components, on-board equipment, test and verification, networks and protocols, and missions and applications. SpaceWire continues to be used extensively and SpaceFibre is gaining momentum, already being designed into spaceflight systems with the first missions in orbit. It is an exciting time in the SpaceWire community as this latest technology literally begins to take off.
The conference committee would like to acknowledge the support and hard work of the many individuals who made 9th International SpaceWire and SpaceFibre Conference possible. Originally planned for 2020 we are grateful that the global flood of pandemic has subsided sufficiently for the conference to go ahead in person in 2022. We appreciate the high-quality and inspiring contributions from the authors and the keynote speakers. We express our gratitude to the Technical Committee for their assistance in the review process. We recognise the support from the University of Pisa, IngeniArs, the European Space Agency and STAR-Dundee. Finally, we would like to give a special thanks to the conference organiser Carole Carrie (STAR-Dundee Ltd.), and the local organisers Pietro Nannipieri (University of Pisa) and Camilla Giunti (IngeniArs)
A representative SpaceFibre network evaluation: Features, performances and future trends
No full textSpaceFibre is a high-speed satellite on-board communication protocol. It allows high data rates (up to 6.25 Gbps per lane), advanced quality of service, fault detection isolation and recovery. Different SpaceFibre nodes can be combined, together with a SpaceFibre routing switch, to form a network. This work aims to describe the set-up of a SpaceFibre network, made of independently developed nodes. The performance of a simplified version of the network is then evaluated and measured, in terms of jitter and latency, for both data packets and broadcast messages, providing a first literature contribution about innovative SpaceFibre network timing performances. It will be a useful indication for future system adopters and could be the baseline for future in-depth measurement and investigation
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
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