1,720,975 research outputs found
High-Density Patterning of InGaZnO by CH4: a Comparative Study of RIE and Pulsed Plasma ALE
No full textThe authors would like to thank Nouredine Rassoul (IMEC) for discussion on the HM strategy and Subhali Subhechha (IMEC) for providing a brief overview of the intended applications of IGZO. We acknowledge the support of IMECs Industrial Affiliation Program and the Active Memory Program. We also acknowledge the support of IMECs pilot line and SEM and MCA team for help with deposition and characterization processes
Statistische analyse en modellering van selector-vrije niet-filamentaire resistieve RAM
No full textResistive switching memories are a class of emerging memories competing in several application domains, for example, Storage Class Memories and Internet of Things. Back-end-of-line compatible fabrication with possibility of stacking and scaling these devices make them attractive for high density applications. However, integrating these memory cells in an array leads to sneak path issues. A selector or access element can overcome this limitation but could involve additional processing or area constraints. A selectorless device with built-in non-linearity can alleviate these complexities. In this thesis, we study amorphous Vacancy Modulated Conductive Oxide (a-VMCO) self-rectifying selectorless devices in detail.
The a-VMCO cell is a hybrid stack comprising a non-linear selector layer (amorphous Silicon) in series with a non-linear switching layer (anatase TiO2). The devices exhibit non-linear I-V characteristics with low reset and set switching currents. We demonstrate that the conduction and the switching is non-filamentary. The memory bit is stored in the spatial defect distribution in the TiO2 layer. Gradual and quasi-analog switching as well as area scaling are consequences of the multiple defect movements inside the switching layer. We use noise analysis technique to extract the current threshold above which significant transients occurs. Using the observations along with pulse monitoring experiments, it is inferred that the switching is mainly current-controlled. The nature of the defects and the underlying physics of the observed current-controlled transients is not known. So, we develop a physics-based and analytic kinetic defect distribution model with field- and current-driven defect movements and use it to understand and predict the device performance. Based on the simulations, we also propose an operation schematic to explain the transients.
The reliability of the a-VMCO devices has been investigated in detail as well. The devices have low read-disturbs at operating read voltage. The variability in these devices is low, which can be attributed to the averaging effect of many defects in the switching layer. However, aggressive scaling in these devices would result in increased variability and localized effects. Long term cycle-to-cycle reliability is limited by the endurance failure. Post-cycling failure analysis using time-dependent dielectric breakdown and elevated temperature retention tests prove that defect loss intrinsically limits the endurance. Defects have to be dynamically generated to sustain cycling in a-VMCO devices. When the devices are allowed to relax under no applied bias, the defect distribution relaxes to the most stable state, i.e., uniform distribution, and the highest conductance is achieved. Discussing the reliability with respect to the model helps to identify and suggest directions for device improvement. The device has application opportunities in systems which require analog switching at low currents with low variability.status: Publishe
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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