1,721,023 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
Sleep and Stroke: Opening Our Eyes to Current Knowledge of a Key Relationship
Full text linkPURPOSE OF REVIEW: To elucidate the interconnection between sleep and stroke. RECENT FINDINGS: Growing data support a bidirectional relationship between stroke and sleep. In particular, there is strong evidence that sleep-disordered breathing plays a pivotal role as risk factor and concur to worsening functional outcome. Conversely, for others sleep disorders (e.g., insomnia, restless legs syndrome, periodic limb movements of sleep, REM sleep behavior disorder), the evidence is weak. Moreover, sleep disturbances are highly prevalent also in chronic stroke and concur to worsening quality of life of patients. Promising novel technologies will probably allow, in a near future, to guarantee a screening of commonest sleep disturbances in a larger proportion of patients with stroke. SUMMARY: Sleep assessment and management should enter in the routinary evaluation of stroke patients, of both acute and chronic phase. Future research should focus on the efficacy of specific sleep intervention as a therapeutic option for stroke patients
Autonomic Nervous System Modifications During Wakefulness and Sleep in a Cohort of Patients with Acute Ischemic Stroke
No full textGoal: The aims of our study were to investigate autonomic modifications in wakefulness and sleep in a cohort of patients with acute ischemic stroke and to evaluate whereas these modifications were dependent by sleep stage and stroke lateralization. Materials and Methods: We prospectively enrolled 42 patients (22 men and 20 women, mean age: 69.8 ± 11.3; range: 32-92 years) with acute ischemic stroke. All participants underwent a full-night polysomnography. As index of autonomic nervous system we used Heart Rate Variability (HRV), analyzed in wakefulness and during different sleep stages. First, we compared our cohort with a control group of 42 healthy subjects, matched for age and sex. Subsequently, we divided our cohort in 2 subgroups according stroke lateralization (21 right, 21 left) and compared with control population. Findings: We observed significant modifications of HRV parameters mainly for the right lesions. In particular, we observed a prevalent parasympathetic tone during the wake (low frequency/high frequency [LF/HF]: right: 2.99 ± 8.91; controls: 3.88 ± 3.42; P < .01) and during REM (LF/HF right: 0.03 ± 1.58; controls: 2.92 ± 3.97; P < .01) accompanied by a significant reduction of sympathetic tone during REM (LF right: 23.85 ± 44.42 n.u.; controls: 51.13 ± 32.25 n.u.; P < .01), and by a reduction of parasympathetic tone during N3 (HF right: 28.09 ± 37.67 n.u.; controls: 43.08 ± 68.39 n.u.; P < .01). Conclusions: Our study indicates that autonomic dysfunctions in acute ischemic stroke are prevalent in right-side lesions and strictly dependent by sleep-wake stage
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
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