1,720,986 research outputs found
Requirements and Challenges for Modelling Redox-based Memristive Devices
No full textDeveloping highly accurate and predictive models
of redox-based memristive devices is highly important to enable
future memory and logic design. As the switching mechanism is
not known in all details yet, accurate device modeling is quite
challenging. Here, we introduce six evaluation criteria for
modeling filamentary switching devices based on the valence
change mechanism, which is a subclass of redox-based
memristive devices. The criteria include the plausibility of the
simulated I-V and I-t characteristics, the nonlinearity of the
switching kinetics, the feasibility of predicting complementary
resistive switching correctly, the possibility of programming
different resistance states, the state-dependence of the resistive
switching, and the occurrence of a fading memory behavior. Four
different models that have been proposed in literature are
analyzed with respect to these criteria. These models are
Kvatinsky's VTEAM model, the Stanford RRAM model,
Strachan's TaOx memristor model and a nonlinear physicsbased
model proposed by our group
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
On the Origin of the Fading Memory Effect in ReRAMs
No full textRedox-based resistive switching devices can be
switched between a high resistance state and a low resistance
state in a reversible manner. An important requirement is the
stable operation between these two states for a high amount of
switching cycles. In this work the switching dynamics of these
devices are investigated by means of device simulation. Hereby,
we discuss the conditions for which a fading memory effect
appears. In this case the switching dynamics of set and reset
process needs to be identical. Using sinusoidal input voltages
fading memory behavior is observed in the simulation results.
The final steady-state oscillation between two resistance states is
only determined by the input voltage signal and not by the initial
state of the device. Moreover, it is found that the time to reach
the steady-state oscillation, the oscillation amplitude and its mean
value depend on a device inherent series resistance. This result
opens a way for tuning the resulting reliable operation window
for memory operation by means of device engineering
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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