1,720,979 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
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
Explaining Entity Matching with Clusters of Words
No full textDeep learning models achieve state-of-the-art per-formance in solving the task of Entity Matching, which aims to identify records that refer to the same real-world entity. However, they act as black-box models for the user, who has limited insights into the rationales behind their decisions. Several explainers (e.g., LIME, Mojito, Landmark, LEMON, and CERTA) have been proposed in the literature to address this issue. Their main focus is to generate explanations that are faithful to the model without considering their comprehensibility to the user. For example, verbose explanations could be very complex to analyze, hindering the model's understanding. In this paper, we propose CREW, an explanation system for Entity Matching models that combines the comprehensibility of the explanations and fidelity to the model. To achieve this, CREW creates explanations as clusters of words. The clusters are created by exploiting three different forms of knowledge: the semantic similarity of the words, their arrangement into the dataset attributes, and their importance in explaining the model. Experiments show that CREW generates explanations that are more interpretable for the user and more faithful to the model than those generated by competing explanation techniques
Infezioni e chirurgia colorettale. Analisi del rischio infettivo post-chirurgico nel paziente anziano.
No full textTheoretical and Electrochemical Analysis of Dissociative Electron Transfers Proceeding through Formation of Loose Radical Anion Species: Reduction of Symmetrical and Unsymmetrical Disulfides
No full textThe dissociative reduction of a series of symmetrical (RSSR, R ) H, Me, t-Bu, Ph) and
unsymmetrical disulfides (RSSR¢, R ) H, R¢ ) Me and R ) Ph, R¢ ) Me, t-Bu) was studied theoretically,
by MO ab initio calculations and, for five of them, also experimentally, by convolution voltammetry in N,Ndimethylformamide.
The reduction is dissociative but proceeds by a stepwise mechanism entailing the
formation of the radical anion species. The electrochemical data led to estimated large intrinsic barriers, in
agreement with an unusually large structural modification undergone by the disulfide molecules upon electron
transfer. The theoretical results refer to MP2/3-21G*//MP2/3-21G*, MP2/3-21*G*//MP2/3-21G*, CBS-4M,
and G2(MP2), the latter approach being used only for the molecules of small molecular complexity. A
loose radical-anion intermediate was localized and the dissociation pattern for the relevant bonds analyzed.
For all compounds, the best fragmentation pathway in solution is cleavage of the S-S bond. In addition,
S-S bond elongation is the major structural modification undergone by the disulfide molecule on its way
to the radical anion and eventually to the fragmentation products. The calculated energy of activation for
the initial electron transfer was estimated from the crossing of the energy profiles of the neutral molecule
and its radical anion (in the form of Morse-like potentials) as a function of the S-S bond length coordinate.
The inner intrinsic barrier obtained in this way is in good agreement with that determined by convolution
voltammetry, once the solvent effect is taken into account
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