1,720,983 research outputs found
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
Optimization of Digital TV coverage prediction and broadcasting antennas
Full text linkThe work described in this thesis focuses on: 1. designing novel antenna techniques and 2. radio propagation and coverage prediction studies in UK, North Macedonia and Greece. Log-Periodic dipole antennas (LPDAs) are a class of antennas that are widely used for ultra-high frequency (UHF) television (TV) reception. Because of the evolution of mobile technologies and excellent building penetration properties in the UHF band, parts of this spectrum are being allocated to Long-Term Evolution (LTE) frequency bands. The new spectrum allocation gives rise to interference problems between these closely spaced frequency bands. Therefore, in order to provide good quality-of-service (QoS) to UHF TV users, new reception antennas are required with band rejection that could eliminate the interference of LTE-800 MHz band and GSM-900 MHz band. Thus, this thesis proposes a design methodology and prototype of a novel LPDA that can provide band rejection in the LTE-800 MHz and GSM-900 MHz bands without using any external filters. The proposed antenna provides good matching, high band rejection and ensures better QoS compared to other existing antennas in the market. It is a cost-effective antenna design as it also removes the cost of using external filters. Furthermore, the LPDA design was also implemented on printed circuit boards (PCBs) in an attempt to reduce the overall size of the antenna. Several miniaturization techniques for reducing the size of LPDAs were reviewed and two prototypes for printed log-periodic dipole antenna (PLPDA) with wide bandwidth are proposed in this thesis. The first prototype follows the conventional PLPDA, designed to operate from 0.7 GHz to 8 GHz. The second prototype is a novel PLPDA design with triangular longest dipole that has an operating frequency range from 0.4 GHz to 8 GHz. Furthermore, two prototypes for elliptical patch antennas are proposed for GPS and Iridium applications and Real-Time locating systems. This work also demonstrates an accurate simulation-assisted antenna gain determination technique in order to improve the accuracy of gain measurements. Lastly, radio propagation and coverage prediction studies were carried out using three measurement campaigns whose results were compared to several propagation models using simulations. The electric field strength, path profiles and coverage prediction were carried out for: 1. Turtel analogue TV transmitter, 2. Emley Moor digital TV transmitter and 3. Belmont digital TV transmitter
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
Efficient design optimization of high-performance MEMS based on a surrogate-assisted self-adaptive differential evolution
Full text linkHigh-performance microelectromechanical systems (MEMS) are playing a critical role in modern engineering systems. Due to computationally expensive numerical analysis and stringent design specifications nowadays, both the optimization efficiency and quality of design solutions become challenges for available MEMS shape optimization methods. In this paper, a new method, called self-adaptive surrogate model-assisted differential evolution for MEMS optimization (ASDEMO), is presented to address these challenges. The main innovation of ASDEMO is a hybrid differential evolution mutation strategy combination and its self-adaptive adoption mechanism, which are proposed for online surrogate model-assisted MEMS optimization. The performance of ASDEMO is demonstrated by a high-performance electro-thermo-elastic micro-actuator, a high-performance corrugated membrane microactuator, and a highly multimodal mathematical benchmark problem. Comparisons with state-of-the-art methods verify the advantages of ASDEMO in terms of efficiency and optimization ability
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
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
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