1,721,189 research outputs found
Semianalytic BER Evaluation Method for FSK Demodulation with Discriminator and Post-Detection Filter
No full textImproved Data Detection Exploiting Full Cyclic Prefix for the evolution of DVB-T
No full textOrthogonal frequency division multiplexing (OFDM) has significantly reduced the complexity of the receivers, however to allow simple equalization procedures and avoid interblock interference, a cyclic prefix (CP) has to be appended to the OFDM block. CP reduces the efficiency of the transmission, because it is discarded at the receiver. This paper proposes a receiver structure which recovers the CP and exploits it to improve data detection. The performance of this structure is then analyzed comparing it with other two structures in a simulation scenario suitable for the evolution of the current Terrestrial Digital Video Broadcasting (DVB-T). The impact of low-density parity check codes (LDPC) is also outlined
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
Power optimization of an 8051-compliant IP microcontroller
No full textSeveral IP cells are available in the market to implement 8051-compliant microcontroller in embedded systems. Yet they frequently lack features that have become a key point in such systems, like power optimization. This paper aims at lowering the power consumption of an 8051 IP core while keeping unaltered performances, through Register Transfer Level techniques such as clustered clock gating, operand isolation and state encoding. This approach preserves the IP high-reusability and technology independence, as it only consists of modifications to the source VHDL code. A total power reduction of about 40% is achieved, with limited area overhead
The “Arrow Factor” in Gluteoplasty and Brazilian Butt Lift
No full textThe gluteal region has become a rising area of interest in plastic surgery in recent years, as reflected in body contouring surgery trends. In this study, the authors explain what the arrow effect consists of and how to highlight it during a Brazilian butt lift or a gluteal liposculpture: liposuction of the sacral triangle, fat grafting of the upper gluteal quadrants, liposuction of the dimples of Venus and of the midline superficially to the spinal column, and fat grafting of the erector spinae muscles
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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