1,720,962 research outputs found
A numerical and experimental comparison of a wavelength conversion for a 200 Gbit/s super-channel in a periodically poled lithium niobate waveguide
No full textTunable all optical wavelength conversion of a 200 Gbit/s super-channel data signal based on the cascaded of sum-frequency generation and different frequency generation in a periodically poled lithium niobate waveguide is demonstrated. This principle of wavelength conversion has been proposed, theoretically analyzed and the numerical results have been compared with the experimental ones
Wavelength Conversion of High Rate Superchannels in a Periodically Poled Lithium Niobate Waveguide
No full textWe numerically demonstrate, comparing with experimental data, a wavelength conversion for a 200 Gbaud super-channel based on the cascaded sum- and difference- frequency generation in a PPLN waveguide
An Innovative Approach to Diffuse Optical Tomography Using Code Division Multiplexing
No full textAbstractThis paper introduces a novel approach to perform Diffuse Optical Tomography overcoming the limitation and high costs of Time Domain conventional methods, using a multichannel double stage coding technique. A preliminary numerical validation of the model is presented
Numerical Results for Wavelength Conversion of Superchannels in a Periodically Poled Lithium Niobate Waveguide
No full textWe report the numerical demonstration of a wavelength conversion for a 200 Gbaud superchannel in a periodically poled Lithium Niobate (PPLN
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
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