1,720,995 research outputs found
Impact of Soft Errors on High Performance Autoencoders for Cyberattack Detection
Full text linkDetecting anomalous messages generated by
cyberattacks is essential for IoT based critical applications (e.g.,
finance, healthcare, manufacturing, etc.), in order to guarantee
high levels of security and availability. Autoencoder-based
anomaly detection has been proven effective in detecting the
presence of messages altered by malicious attacks. To guarantee
low detection latency, autoencoders’ algorithms are typically
executed by HW accelerators implemented by nanotechnology.
However, such HW accelerators are susceptible to soft errors
(SEs), that may occur during their in-field operation. In this
paper, we analyze the impact of SEs on the effectiveness of
autoencoders in detecting anomalous messages generated by
cyberattacks. As an example, we consider autoencoders trained
to discriminate credit card legal and illegal transactions. We
show that SEs do not decrease system’s security, but may reduce
system’s availability of the 70%, so that proper solutions to
avoid the detrimental impact of SEs on system’s availability
should be devised for autoencoders implemented by high
performance HW accelerators
Low-Cost Strategy to Detect Faults Affecting Scrubbers in SRAM-Based FPGAs
Full text linkSRAM-based Field Programmable Gate Arrays (FPGAs) are vulnerable to SEUs. For applications demanding high reliability this problem is often solved by integrating in the system a scrubber, a circuit that periodically scans the FPGA configuration memory and reconfigures it if an error is detected. Since the scrubber is usually implemented in the same FPGA device, it is also vulnerable to SEUs, thus the scrubber reliability is increased by adopting standard fault tolerance techniques. These solutions guarantee the scrubber reliability, but generally require a large area overhead.
In this paper, we present a novel low-cost strategy capable to detect faults in the FPGA configuration memory implementing the scrubber. The proposed technique is based on time redundancy, forcing the scrubber output to produce an error indication for each word read from the FPGA memory, in order to detect the faults affecting the portion of FPGA memory implementing the scrubber. The implementation of our proposed strategy presents a negligible impact in terms of area overhead (4.17%) and a limited increase in power consumption (22.9%) over the original (unprotected) scrubber. As for the impact on system performance introduced by our strategy, it is of approximately the 38.2% over the unprotected scrubber, but it can be significantly lowered by reducing the frequency at which the scrubber is applied to test the FPGA
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
Faults Affecting the Control Blocks of PV Arrays and Techniques for Their Concurrent Detection
No full textWe analyze the effects of the faults that are most likely to affect the control circuitry of photovoltaic (PV) arrays, that is their Maximum Power Point Tracker (MPPT) and DC-AC converter. Particularly, we study their possible impact on the efficiency of the whole PV system and we prove that they may produce catastrophic effects on the PV array power efficiency. Based on these achieved results, we then propose two novel lowcost approaches for the concurrent detection of the faults most likely to affect the MPPT and the DC-AC converter. These approaches could allow the activation of proper reconfiguration
schemes upon fault detection, thus avoiding the detrimental effects on the PV system efficiency due to such faults occurrence
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
- …
