1,721,356 research outputs found
Wireless Epidemic Spread in Dynamic Human Networks
Full text linkThe emergence of Delay Tolerant Networks (DTNs) has culminated in
a new generation of wireless networking. New communication paradigms, which
use dynamic interconnectedness as people encounter each other opportunistically,
lead towards a world where digital traffic flows more easily. We focus on humanto-
human communication in environments that exhibit the characteristics of social
networks. This paper describes our study of information flow during epidemic
spread in such dynamic human networks, a topic which shares many issues with
network-based epidemiology. We explore hub nodes extracted from real world
connectivity traces and show their influence on the epidemic to demonstrate the
characteristics of information propagation
Watching Television Over an IP Network
No full textFor half a century, television has been a dominant and pervasive mass media, driving many technological advances. Despite its widespread usage and importance to emerging applications, the ingrained TV viewing habits are not completely understood. This was primarily due to the difficulty of instrumenting monitoring devices at individual homes at a large scale. The recent boom of Internet TV (IPTV) has enabled us to monitor the user behavior and network usage of an entire network. Such analysis can provide a clearer picture of how people watch TV and how the underlying networks and systems can better adapt to future challenges. In this paper, we present the first analysis of IPTV workloads based on network traces from one of the world's largest IPTV systems. Our dataset captures the channel change activities of 250,000 households over a six month period. We characterize the properties of viewing sessions, channel popularity dynamics, geographical locality, and channel switching behaviors. We discuss implications of our findings on networks and systems, including the support needed for fast channel changes. Our data analysis of an operational IPTV system has important implications on not only existing and future IPTV systems, but also the design of the open Internet TV distribution systems such as Joost and BBC's iPlayer that distribute television on the wider Internet.We thank Catherine Howell, Nuno Santos, Juan Antonio
Navarro P´erez, Animesh Nandi, Nikos Laoutaris, and anony-
mous reviewers, for their valuable comments.
Sue Moon was supported by the IT R&D program of
MKE/IITA [A1100-0801-2758,CASFI]. Xavier Amatriain
was partially funded by an ICREA grant
The digital person - the state of the art and science : a white paper from the 2nd Wolfson - HAT international symposium on the digital person
Full text linkThis paper reports the discussion of the 2nd Wolfson/HAT International Symposium on the Digital Person 31 May 2018. The symposium was chaired by Professor Irene Ng, representing the social sciences, Professor Jon Crowcroft, representing the sciences and Professor John Naughton, representing the humanities
SPATIAL 3rd Newsletter
No full textCheck the SPATIAL Project latest news!➡️https://lnkd.in/dMpjc-kV
What will you find?
SPATIAL at the IoT Week 2022.
2Digital Services Act and Digital Markets Act set a new cornerstone for digital in Europe" article.
SPATIAL at The Projects to Policy Seminar in Brussels.
Interview with Jon Crowcroft from Cambridge University.
#TrustworthyAI #ArtificialIntelligence #A
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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