1,720,959 research outputs found
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
A CMOS automatic gain control design based on piece-wise linear circuits
Get PDFIn many electronic systems, a circuit capable of reducing the dynamic range of a
signal is needed. An Automatic Gain Control (AGC) system is a complex circuit
that maintains its output signal amplitude relatively constant, independently of
the input variations. The time response of the AGC must also be constant, in
order to maximize the system bandwidth and to reduce acquisition times. In this
thesis a novel method to design and implement an AGC loop is presented, based
on piece-wise linear (PWL) circuits. This PWL technique is used to design an
exponential and logarithmic pre-distortion circuits which are implemented inside
the AGC loop in order to have a linear-in-dB system and, as a consequence, to
obtain a constant settling time AGC response. Also, two exponential variable
gain amplifiers (VGA) and a peak detector were designed using the PWL predistortion
circuits mentioned before. Thus, a complete AGC loop is implemented
and tested at the laboratory to probe the validity of the proposed blocks.
In Chapter 1 a brief introduction is presented, describing the principal AGC
blocks, its basic operation, types of AGCs and finally AGC applications are
mentioned. In Chapter 2 a PWL exponential pre-distortion circuit was proposed,
based on current mirrors and a Winner-Take-All circuit. This approach
is technology-independent, as it does not rely on the quadratic behavior of MOS
transistors in strong inversion, and remains therefore valid for deep submicron
CMOS processes, as opposed to former exponential approximations found in literature.
Moreover, the proposed exponential pre-distortion circuit is not limited to
a certain range of validity. In other words, the range of validity can be extended by
adding segments to the implementation, at a cost of area and power consumption.
The proposed approach was validated with experimental results from a 6-segment
prototype, which showed a very wide linear-in-dB range of 41.97dB with 2.55dB
maximum error
Design and applications of CMOS current conveyors
Get PDFA Current Conveyor (CC) is a minimum 3-terminals device which can perform many useful analog signal processing functions. The first generation CC was introduced in 1969, and more recently, it is a good alternative in Current-Mode design. Nowadays, the CCs can be classified as direct and inverted, and they are divided as first, second and third generation, where they can be positive-type, negative-type, multiple-output and/or current-controlled. In this Thesis it is highlighted that the CC can be easily designed by combining
the connection among di®erent Unity Gain Cells (UGCs) as basic building blocks. Furthermore, from the characteristic equation of each kind of CC, they can be implemented just by superimposing or by cascading UGCs such as voltage (VF) and current followers (CF), and voltage (VM) and current mirrors (CM). New Nullor equivalent representations for all CC topologies are introduced in this work, which are used to perform symbolic analysis of CC-based circuits by applying Nodal Analysis (NA). It is shown that the nullor is a very useful concept that helps the designer to easily analyze analog circuits. In this manner, by using this ideal concept, analytical equations (transfer functions) of CC-based circuits are calculated. The realization of the UGC-based CCs begins by designing each UGC at the transistor level of abstraction. Each UGC has been designed as a symmetrical
type circuit in order to allow superimposing or cascading connection to implement all kinds of CCs, both direct and inverted. Finally, some applications of the UGC-based CCs, like filtering, sinusoidal oscillator and inductance simulator, are presented to show their suitability and usefulness in the field of analog signal processing.El Current Conveyor (CC) es un dispositivo con un mínimo de tres terminales, el cual puede realizar diversas funciones de procesado analógico de señales. La primera generació de los CC fue presentada en 1969, y recientemente se ha visto como una buena alternativa en el dise~no de circuitos en modo corriente. Los CC pueden ser clasificados como directos o inversos, divididos en primera, segunda y tercera generación, los cuales están subdivididos en positivos, negativos, múltiples salidas y/o controlados por corriente. En el presente trabajo los CC son diseñados combinando diferentes celdas de
ganancia unitaria (UGCs) como bloques básicos de diseño. Tomando la ecuación característica de cada tipo de CC, estos pueden ser implementados superimponiendo estas UGCs, tales como los seguidores de voltaje (VF) y corriente (CF), y espejos de voltaje (VM) y corriente (CM). Se presentan nuevos equivalentes con nullor para todas las topologías de CC, los cuales son usados para realizar un análisis simbólico de circuitos basados en CC aplicando análisis nodal (NA). Se muestra que el nullor es un concepto muy útil que ayuda al diseñador a analizar fácilmente circuitos analógicos. De esta manera, utilizando este concepto ideal, se calculan las funciones de transferencia de varios circuitos basados en los CC. La realización de los CC basados en UGCs comienza dise~nando cada una de es- tas celdas a nivel transistor. Las UGCs fueron diseñadas como circuitos simétricos para poder superimponer cada una de estas celdas para implementar todos los tipos de CC, tanto directos como inversos. Finalmente, algunas aplicaciones de estos CC basados en UGCs son implementados, tales como filtros, osciladores sinusoidales o simuladores de inductancias para demostrar su utilidad en el campo del proceso analógico de señales
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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