1,720,961 research outputs found
Single-chip mixed-radix FFT processor for real-time on-board SAR processing
No full textReal-time Earth observation has become essential for many applications such as natural disasters monitoring, coastal maritime surveillance and winter navigation in polar seas. In this respect the European Space Agency (ESA) has recently proposed the so called on-board SAR processing system (OSPS) which needs powerful real-time DSP and FFT processors to be implemented in rad-hard technology. In this paper a VLSI single chip programmable FFT processor suitable for the ESA OSPS is presented. The FFT processor is able to process 32, 64, 128 and 256 complex points FFT, with an input data rate of 50 Mcomplexsample/s. For low-cost proof-of-concept prototyping the chip was designed in 0.6 μm CMOS technology yielding an overall core area of 36.09 mm2 for about 43 Kgate and demonstrated to be fully functional by extensive computer simulation
Design, testing and prototyping of a software programmable I2C/SPI IP on AMBA bus
No full textWhile power consumption and area occupation are always critical constrains in System-on-Chip design, at the same time high communication flexibility is required, due to proliferation of communication protocols. In this work a novel architecture for an I2C/SPI interface for APB AMBA bus is presented, showing how it is possible to merge flexibility and reduced area occupation. Large part of this work is centered on the testing and FPGA prototyping of this IP. CMOS synthesis results on 0.18 μm standard cell library are also presented
Mixed Signal Behavioral Verification using VHDL-AMS
No full textIn this paper we describe a methodology to set up a behavioral verification for complex mixed-signal System-on-Chip (SoC). The verification flow, consisting in VHDL-AMS modeling of the analog and mixed-signal section of a generic system, is depicted. This methodology has been successfully adopted for the top level debugging of a mixed signal SoC for sensor interface
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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