1,721,044 research outputs found
The 3rd workshop on active internet measurements (AIMS-3) report
No full textOn February 10-12, 2011, CAIDA hosted the third Workshop on Active Internet Measurements (AIMS-3) as part of our series of Internet Statistics and Metrics Analysis (ISMA) workshops. As with the previous two AIMS workshops, the goals were to further our understanding of the potential and limitations of active measurement research and infrastructure in the wide-area Internet, and to promote cooperative solutions and coordinated strategies to address future data needs of the network and security research communities. For three years, the workshop has fostered interdisciplinary conversation among researchers, operators, and government, focused on analysis of goals, means, and emerging issues in active Internet measurement projects. The first workshop emphasized discussion of existing hardware and software platforms for macroscopic measurement and mapping of Internet properties, in particular those related to cybersecurity. The second workshop included more performance evaluation and data-sharing approaches. This year we expanded the workshop agenda to include active measurement topics of more recent interest: broadband performance; gauging IPv6 deployment; and measurement activities in international research networks.</jats:p
Tracking IPv6 evolution
No full textExhaustion of the Internet addressing authority's (IANA) available IPv4 address space, which occurred in February 2011, is finally exerting exogenous pressure on network operators to begin to deploy IPv6. There are two possible outcomes from this transition. IPv6 may be widely adopted and embraced, causing many existing methods to measure and monitor the Internet to be ineffective. A second possibility is that IPv6 languishes, transition mechanisms fail, or performance suffers. Either scenario requires data, measurement, and analysis to inform technical, business, and policy decisions. We survey available data that have allowed limited tracking of IPv6 deployment thus far, describe additional types of data that would support better tracking, and offer a perspective on the challenging future of IPv6 evolution.</jats:p
Underneath the hood
No full textI recently published this essay on CircleID on my thoughts on ICANN's recent decision to launch .XXX and the larger new gTLD program this year. Among other observations, I describe how .XXX marks a historical inflection point, where ICANN's board formally abandoned any responsibility to present an understanding of the ramifications of probable negative externalities ("harms") in setting its policies. That ICANN chose to relinquish this responsibility puts the U.S. government in the awkward position of trying to tighten the few inadequate controls that remain over ICANN, and leaves individual and responsible corporate citizens in the unenviable yet familiar position of bracing for the consequences.</jats:p
"Network Neutrality"
No full textIn June 2011 I participated on a panel on network neutrality hosted at the June cybersecurity meeting of the DHS/SRI Infosec Technology Transition Council (ITTC), where "experts and leaders from the government, private, financial, IT, venture capitalist,and academia and science sectors came together to address the problem of identity theft and related criminal activity on the Internet." I recently wrote up some of my thoughts on that panel, including what network neutrality has to do with cybersecurity.</jats:p
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
Internet topology: connectivity of IP graphs
No full textIn this paper we introduce a framework for analyzing local properties of Internet connectivity. We compare BGP and probed topology data, finding that currently probed topology data yields much denser coverage of AS-level connectivity. We describe data acquisition and construction of several IP-level graphs derived from a collection of 220M skitter traceroutes. We find that a graph consisting of IP nodes and links contains 90.5% of its 629K nodes in the acyclic subgraph. In particular, 55% of the IP nodes are in trees. Full bidirectional connectivity is observed for a giant component containing 8.3% of IP nodes
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