1,720,959 research outputs found
P. Fogagnolo, P. Frezzotti, P. Mittica, M. Digiuni, R. Paderni, E. Vallenzasca, L. Rossetti
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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
The Effects of Topical Coenzyme Q After Cataract Surgery. A Clinical and Confocal Study
No full textPurpose:To evaluate the postoperative effects of topical coenzyme Q in patients who underwent cataract surgery.
Methods:20 consecutive patients who underwent uneventful cataract surgery (3.2-mm temporal incision, phacoemulsification + IOL in the bag) were treated with topical antibiotics and corticosteroids for 2 weeks after surgery and, thereafter, with topical coenzyme Q or saline solution twice daily for 3 months. Patients received full eye examination and the following examinations before surgery and at days 14, 90: Schirmer test (ST), Break-up time (BUT), aestesiometry (AE), in vivo confocal microscopy of the cornea. The density of the sub-basal nerves was calculated in the central (CND) and temporal (TND) cornea.
Results:Before surgery ST was 12±3 mm, BUT 11±2 sec, AE 58±2 mm, CND 7.1±2.6, TND 6.0±2.4. At day 14, a small decrease of ST, BUT, AE was found (2±1 mm, 1±1 sec and 8±3 mm respectively; P>0.05 compared with baseline), whereas a significant reduction in CND (-2.3±2.1, P=0.003), and TND (-2.4±1.9, P=0.001) was shown. At day 90, ST, BUT, AE were similar compared with baseline (P>0.05), whereas there were higher CND (6.6±3.1) and TND (5.0±3.1) compared with day 14 (P=0.01 and 0.05 respectively).
Conclusions:Our results confirm that even uneventful cataract surgery leads to relevant changes of the corneal nerves which may influence ocular surface function. From our short-term data, a 3-month treatment with topical coenzyme Q had a positive effect in restoring the normal anatomy of the sub-basal nerve plexus. Longer follow-up and comparison with controls are needed to provide confirmation of these findings
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
Repeatibility and reproducibility of applanation resonance tonometry
No full textPurpose:To assess repeatability (intra-observer variability) and reproducibility (inter-observer variability) of intraocular pressure (IOP) measurements with Applanation Resonance Tonometry (ART) and to evaluate possible influential factors.
Methods:The study included 178 patients (101 glaucoma, 63 healthy and 14 with OHT; one eye per subject) from two Italian centers (Eye Clinic of San Paolo Hospital of Milan and University of Siena). IOP was measured once with a Goldmann applanation tonometer (GAT) and twice by ART (ART1, ART2) in a randomized sequence, by a single operator to assess intra-operator variability. To assess inter-operator variability 2 operators, chosen randomly (A and B, B and C, A and C), performed 2 measurements each (in random order; i.e. A B A B; B A B A) on the same patient. Repeatability and reproducibility were assessed by the coefficient of variation (CoV) and intraclass correlation coefficient (ICC).
Results:ART1 was 0.4±2.8 mmHg higher than ART2 (p<0.001). Results were not influenced by randomization test order. Intra-operator CoV was 7.6%±7.6%, and ICC was 0.88 (95%CI: 0.85-0.91). Inter-operator CoV ranged between 6.0%±10.8% and 8.0%±6.8%, and ICC between 0.906 and 0.917. ART1 and 2 were respectively 1.8±3.8 and 1.4±4.3 mmHg higher than GAT (p<0.001). Results were unaffected by diagnosis, age, central corneal thickness, keratometry, operator, randomization sequence.
Conclusions:ART repeatability and reproducibility were almost perfect. Tonometry measurements with ART tended to be overestimated compared with GAT
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