1,721,109 research outputs found
Last-level cache side-channel attacks are practical
No full textWe present an effective implementation of the PRIME+PROBE side-channel attack against the lastlevel cache. We measure the capacity of the covert channel the attack creates and demonstrate a cross-core, cross-VM attack on multiple versions of GnuPG. Our technique achieves a high attack resolution without relying on weaknesses in the OS or virtual machine monitor or on sharing memory between attacker and victim.Fangfei Liu, Yuval Yarom, Qian Ge, Gernot Heiser, Ruby B. Le
A Comparison of Address Translation Mechanisms for Virtually-Addressed Caches in Embedded Systems
No full textVirtual memory is a runtime abstraction that allows for more secure, robust and easier to develop software. Virtual memory may be used on embedded systems to reduce costs of development and improve the reliability of systems. However, virtual memory has both time and energy overheads. Virtually-addressed caches offer a means of potentially reducing these. In this thesis, one component of virtual memory, address translation, is explored on virtually-addressed caches, in the context of embedded systems. A detailed survey of the literature is presented, and an experimental approach is utilised to quantitatively compare the options available for address translation on virtually-addressed caches, with the goal of characterising the mechanism that provides the lowest energy and time overheads. Acknowledgments I would like to thank my family, Jeff, Sandy, Laurie and Sharni, and express my gratitude for their endless dedication and support for me throughout my education. I'd also like to thank John Lai for the provision of intelligent conversation at all times during the past 4 years, and in particular the generous amount of time spent on proof-reading and feedback for this thesis. I'd like to thank Adam Wiggins for the many hours of supervision, feedback, and discussion he provided --- I doubt I would have remained as focussed without this. The large amount of feedback provided by my supervisor Gernot Heiser was also of great help and made a large difference to the structure of this thesis. I'd like to express thanks to Chris Szmajda for suggesting this topic through his discussion paper and the critical and insightful feedback he provided. I would finally like to thank the others who proof-read drafts of this thesis: Luke Macpherson and Shane Stephens. Contents
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
Measurements or Static Analysis or Both?
Full text linkTo date, measurement-based WCET analysis and
static analysis have largely been seen as being at
odds with each other. We argue that instead they
should be considered complementary, and that the
combination of both represents a promising approach
that provides benefits over either individual
approach. In this paper we discuss in some
detail how we aim to improve on our probabilistic
measurement-based technique by adding static
cache analysis. Specifically we are planning to
make use of recent advances within the functional
languages research community. The objective of
this paper is not to present finished or almost finished
work. Instead we hope to trigger discussion
and solicit feedback from the community in order
to avoid pitfalls experienced by others and to help
focus our research
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