1,720,964 research outputs found
Matlab/Simulink Modeling of SiC Power MOSFETs
No full textSimulation and rapid prototyping of power converters requires accurate models of all passive and active elements, which take into account most important physical parameters and not only electrical quantities. Their availability is fundamental to verify the expected behaviour of the complete system including its control algoritm without building any prototype. For this reason, due to the wide use of Simulinkr in simulation of complex systems, this paper attempts to study the main characteristics of a typical Silicon Carbide (SiC) power MOSFETs and proposes its Simulinkr model. The static and dynamic characteristics of the device are described by voltage and current sources which behaviour depend on temperature values. Switching power losses are considered by introducing parasitic capacitances in its equivalent circuit, thus obtaining a dynamic characteristic of the device. The proposed model has been validated using a typical 4H-SiC MOSFET (1200V, 20A) in an illustrative example consisting of a 5-level cascaded inverter.Simulation and rapid prototyping of power converters requires accurate models of all
passive and active elements, which take into account most
important physical parameters and not
only electrical quantities. Their availability is fundamental to verify the expected behaviour of the
complete system including its control algorithm without building any prototype. For this reason,
due to the wide use of Simulink ® in simulation of complex systems, this paper attempts to study the
main characteristics of a typical Silicon Carbide (SiC) power MOSFETs and proposes its Simulink ®
model. The static and dynamic characteristics of the device are described by voltage
and current sources which behaviour depend on temperature values. Switching power losses are
considered by introducing parasitic capacitances in its equivalent circuit, thus obtaining a
dynamic characteristic of the device. The proposed model has been validated using a typical 4H-
SiC MOSFET (1200V, 20A) in an illustrative example consisting of a 5-level cascaded inverter
An OpenMP Parallel Genetic Algorithm for Design Space Exploration of Heterogeneous Multi-processor Embedded Systems
No full textA PageRank-based preferential attachment model for the evolution of the World Wide Web
No full textWe propose a model of network growth aimed at mimicking the evolution of theWorld Wide Web. To this purpose, we take as a key quantity, in the network evolution, the centrality or importance of a vertex as measured by its PageRank. Using a preferential attachment rule and a rewiring procedure based on this quantity, we can reproduce most of the topological properties of the system. Copyright © EPLA, 2010
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
A lightweight, hardware-based support for isolation in mixed-criticality network-on-chip architectures
No full textDispelling 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
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