1,721,200 research outputs found
Technology strategy in defense industry acquisitions : a comparative assessment of two giants
Get PDF"August 1997."Includes bibliographical references (p. 23-24).Rahul N. Advani ... [et al.
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
Investigation of co-channel interference, channel dispersion, and multi-user diversity in MIMO-based cellular systems
No full textIn recent years, Multiple-Input/Multiple-Output (MIMO) systems employing multiple antennas at both ends of the wireless link have been shown to deliver high spectral efficiencies with reasonable constellation sizes. A MIMO link is a special case of a Multi-Element Antenna (MEA) link, wherein one or both ends use a multi-element array. Recently proposed 4G cellular systems are being evaluated that combine MIMO with Orthogonal Frequency Division Multiplexing (MIMO-OFDM) for use at the radio layer, while WiMAX 802.16e is considering MIMO with Orthogonal Frequency Division Multiple Access (MIMO-OFDMA) for use on the downlink. Multi-User Diversity (MuD) has also been shown to have important consequences in the ever-increasing demand for higher spectral efficiency. A detailed study of MIMO, MIMO-OFDM, and MuD is of utmost importance to understand how to maximize the performance gains that can be realized from these promising technologies.
This thesis is broadly divisible into three parts. Part I investigates aspects of co-channel interference (CCI) as they relate to MIMO channels. First, the throughputs attainable by interference-limited cellular systems that employ MEA links are computed. The emphasis in this study is on the system-level perspective. That is, determining the distribution of performance over a coverage area, e.g., the cumulative distributive function (CDF) of throughput (TP) over the randomness of user location and shadow fading, as well as and taking into account the CCI produced by co-channel links in other cells. Using a general-purpose simulation platform developed in this work, throughput statistics are obtained over several channel conditions and system-level design choices. In this study, particular interest is in understanding the gains that accrue as a result of using excess receive antennas, and the effects of limiting the constellation sizes to present-day implementations.
Using the simulation platform, an evaluation of alternative Transmit Diversity, and Spatial Multiplexing systems has been carried out. The study incorporates costs/overhead incurred by using a finite alphabet, limited channel coding, and imperfect channel estimation. Next, a noise-like model for co-channel interference is postulated in the context of MIMO/MEA channels. The validity of the noise-like model is demonstrated. The model is then used to derive an analytical solution for throughput in CCI-limited MIMO systems. The analysis is shown to be accurate and to permit extensive investigation without the need for lengthy simulations.
In Part II, the effects of both frequency selectivity and correlation among transmit-receive antenna path gains on a single-carrier MIMO link are addressed. Degradations in system-level throughput statistics are evident when these distortions are assumed to be present in addition to CCI. This study includes the frequency-selective MIMO link when it uses non-dispersive cancellation of cross-stream interference at the receiver. We extend this analysis to MIMO-OFDM, and include the impact of dispersive effects which is the often ignored in such systems.
In Part III, the benefit of adding MuD to the MEA link is quantified. The three important schedulers considered in the MuD implementation are: Maximal Throughput (MAX), Proportional Fair (PF), and Equal Grade of Service (EGoS). Again, performance evaluation is at the system-level, and over several important system design parameters, in particular, excess receive antennas and finite constellation sizes. The main interest is to determine the tradeoff involved in the number of receive antennas on the mobile device versus the number of users needed in order to obtain a particular throughput.
Studying the many tradeoffs discussed above will enable design engineers to make well-founded decisions in crafting link techniques; and will aid system engineers in estimating attainable throughputs for particular designs. The results presented will be to the benefit of operators and customers alike as MIMO, MIMO-OFDM, and MuD technologies are put into service in support of new applications.Ph.D.Includes bibliographical references (p. 160-164)
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
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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