1,721,135 research outputs found
Memory access decoupling in a multithreaded architecture
No full textThis is a presentation of initial ideas on techniques that can be used in order to achieve a predictable execution time in presence of cache memory
Implementing DTA support in CellSim
No full textDecoupled Threaded Architecture (DTA) is designed to exploit Thread Level Parallelism (TLP) by using many simple cores grouped into a cluster for providing a scalable solution that copes with wire delay. Cell Broadband Engine (CBE) is a multiprocessor on a chip developed by Sony, Toshiba and IBM that contains one general purpose core and eight coprocessor elements that accelerate the multimedia and vector processing. Here we illustrate the work that has been performed in implementing DTA support in the Cell processor using CellSim and we present the initial results that we have obtained
Nonuniform transmission lines for broadband dispersion compensation
No full textThis paper discusses broadband dispersion control at microwave frequencies using non-uniform transmission-line elements
Power Management of Wideband Code Division Multiple Access RF Power Amplifiers with Antenna Mismatch
No full textThis paper focuses on a combination of adaptive
power supply and adaptive impedance tuning for WCDMA RF
power amplifiers (RFPA) in wireless handsets in order to improve
the system efficiency under different transmit power levels and
antenna mismatch. The adaptive power supply is a noninverting
buck–boost power converter. It is shown that precise output voltage
positioning and low output voltage ripple over a wide output
voltage range, including buck, boost, and buck/boost transition
modes, can be accomplished using Σ–Δ modulation in combination
with a small, low-resolution DPWM core. A two-mode digital
controller is presented, in which the compensator parameters are
changed upon buck/boost mode transitions in order to improve
closed-loop dynamic performance. Furthermore, improvements in
system efficiency are demonstrated using this adaptive power supply
combined with an adaptive RF impedance tuner between the
RFPA and the antenna. The results are verified on an experimental
test bed that consists of a discrete RFPA, impedance tuner,
a prototype 0.5 μm CMOS power stage IC that integrates power
MOSFETs, drivers and deadtime control logic, and a digital power
management controller implemented on an 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
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