1,721,474 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
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
Classification of drug-induced hERG potassium-channel block from electrocardiographic T-wave features using artificial neural networks
Full text linkBackground: Human ether‐à‐go‐go‐related gene (hERG) potassium‐channel block
represents a harmful side effect of drug therapy that may cause torsade de pointes
(TdP). Analysis of ventricular repolarization through electrocardiographic T‐wave features
represents a noninvasive way to accurately evaluate the TdP risk in drug‐safety
studies. This study proposes an artificial neural network (ANN) for noninvasive electrocardiography‐
based classification of the hERG potassium‐channel block.
Methods: The data were taken from the “ECG Effects of Ranolazine, Dofetilide,
Verapamil, and Quinidine in Healthy Subjects” Physionet database; they consisted of
median vector magnitude (VM) beats of 22 healthy subjects receiving a single 500 μg
dose of dofetilide. Fourteen VM beats were considered for each subject, relative
to time‐points ranging from 0.5 hr before to 14.0 hr after dofetilide administration.
For each VM, changes in two indexes accounting for the early and the late phases
of repolarization, ΔERD30% and ΔTS/A, respectively, were computed as difference
between values at each postdose time‐point and the predose time‐point. Thus, the
dataset contained 286 ΔERD30%‐ΔTS/A pairs, partitioned into training, validation, and
test sets (114, 29, and 143 pairs, respectively) and used as inputs of a two‐layer feedforward
ANN with two target classes: high block (HB) and low block (LB). Optimal
ANN (OANN) was identified using the training and validation sets and tested on the
test set.
Results: Test set area under the receiver operating characteristic was 0.91; sensitivity,
specificity, accuracy, and precision were 0.93, 0.83, 0.92, and 0.96, respectively.
Conclusion: OANN represents a reliable tool for noninvasive assessment of the hERG
potassium‐channel block
Control of the crystal size distribution of the titanium dioxide particles using a spinning disc reactor
No full textWhen age is academically constructed: The endless status of ‘young researchers’ in Italy
No full textBased on the findings of research conducted in a university located in Northern Italy, this chapter analyses the different discursive constructions of age that are mobilized at the national level and how they are translated in two university departments - one of which was science, technology, engineering and mathematics and the other, social sciences and humanities (SSH). The ageing of academic staff in Italy is a core issue in the debate on the sustainability and quality of the scientific productivity of the academic system. The coexistence of such broad-ranging academic profiles makes the required criteria to obtain a position as assistant professor a space of negotiation and/or conflict. In the SSH department, there was then also an organizational discourse that somehow, though not explicitly, supported the candidates who had spent many years within the same department. The chapter discusses how the concept of age is mobilized within institutional and organizational discourses in Italian academia
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