1,720,955 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
Assessing the predictive limitations of anti-Müllerian hormone in ovarian response: insights from controlled ovarian stimulation
Full text linkBackground: Anti-Müllerian hormone (AMH) is widely used to assess ovarian reserve and predict ovarian response during controlled ovarian stimulation (COS) in in vitro fertilization (IVF) cycles. This study aims to evaluate the accuracy of AMH in predicting ovarian response, embryo quality, and clinical outcomes in IVF/ICSI cycles using a gonadotropin-releasing hormone (GnRH) antagonist protocol with a standardized gonadotropin dose of 150 IU for high and suboptimal responders. Additionally, the study examines the predictive value of alternative markers, such as age and antral follicle count (AFC), especially for suboptimal responders.
Methods: This retrospective, single-centre study analysed data from 158 women aged 21-35 years with AMH ≥1.5 ng/ml undergoing their first IVF cycle from July 2022 to July 2023. Patients were categorized into poor responders (<4 oocytes), suboptimal responders (4-9 oocytes), and high responders (≥10 oocytes) based on oocyte retrieval. AMH levels, AFC, and age were assessed as predictors of ovarian response, embryo quality, and implantation rates. Statistical analyses included linear and logistic regression, and receiver operating characteristic (ROC) curves were used to evaluate predictive accuracy.
Results: Among 158 patients meeting the inclusion criteria, AMH showed a significant correlation with the number of oocytes retrieved (p=0.0036). High responders had better embryo quality and clinical pregnancy rates compared to suboptimal responders. AMH had a higher predictive value for high response (AUC=0.682) compared to suboptimal response (AUC=0.378), where age was a better predictor (AUC=0.522).
Conclusions: AMH is a reliable predictor of high ovarian response in GnRH antagonist protocols but is less effective for suboptimal responders. Comprehensive evaluations incorporating AMH, age, and AFC are crucial for individualized COS strategies to optimize outcomes in assisted reproductive technologies
Comparative analysis of dehydroepiandrosterone and transdermal testosterone pre-treatment in POSEIDON group 3 and 4 women undergoing in vitro fertilization: a retrospective cohort study
Full text linkBackground: Patients classified under patient-oriented strategies encompassing individualised oocyte number (POSEIDON) groups 3 and 4 typically demonstrate suboptimal response to controlled ovarian stimulation (COS) in in vitro fertilization (IVF) cycles. Androgen-based pre-treatments like dehydroepiandrosterone (DHEA) and transdermal testosterone have been studied for their role in enhancing ovarian response, although direct comparative data are limited. Objective of the study was to evaluate and compare the effects of DHEA versus transdermal testosterone gel administered before stimulation on ovarian and embryological outcomes in women within POSEIDON groups 3 and 4 undergoing IVF.
Methods: A retrospective cohort study was conducted at a tertiary fertility centre in India between January 2018 and January 2020. Eligible women received either DHEA (75 mg/day for 12 weeks) or testosterone gel (12.5 mg/day for 21 days) before controlled ovarian stimulation (COS). All patients underwent antagonist protocol with dual trigger followed by IVF. Primary outcomes included number of oocytes retrieved, metaphase II (MII) oocytes, and follicular output rate (FORT). Secondary outcomes included fertilization rate, good-quality embryos, and stimulation burden.
Results: Of 237 women analysed, 144 received DHEA and 93 received testosterone gel. The testosterone group showed significantly higher mean oocyte yield (7.2 versus 5.4; p<0.01), MII oocytes (5.6 versus 4.0; p<0.01), and FORT (58.2% versus 49.3%; p<0.01). While fertilization rate (63.5% versus 61.2%; p=0.37) and embryo quality (59.1% versus 57.6%; p=0.75) were similar, testosterone-treated patients required fewer days of stimulation (9.7 versus 10.3; p=0.04) and lower gonadotropin doses (2291 IU versus 2576 IU; p<0.01). No OHSS cases occurred in either group.
Conclusions: This study supports the use of short-course transdermal testosterone as a more practical and efficient adjuvant strategy in poor prognosis IVF cycles. It may be especially valuable in resource-constrained settings, where cost-effectiveness and cycle efficiency are critical to success. Further prospective trials are needed to evaluate long-term reproductive outcomes
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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