1,720,966 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
The impact of endometriosis on fertility
Get PDFAlthough the prevalence of endometriosis in infertile women seemed to be nearly 50%, all women with endometriosis are not infertile..
A novel approach for congenital absence of the uterine cervix: Office hysteroscopic versapoint canalization using real-time trans-abdominal sonography guidance
Get PDFHerein, we report a novel technique for cervical agenesis via office hysteroscopy using Versapoint using real-time trans-abdominal sonography guidance. Fourteen days after the canalization procedure, a second hysteroscopy was performed to remove the silicone catheter and insert a Cupper T380a intrauterine device, which aimed to prevent a neocervical canal occlusion. This is the first case report of a patient with congenital cervical agenesis undergoing canalization with Versapoint in an office hysteroscopy; laparoscopy was not performed for assistance
A novel approach using a minimal number of injections during the IVF/ICSI cycle: Luteal half-dose depot GnRH agonist following corifollitropin alfa versus the corifollitropin alfa with a GnRH-antagonist cycle
Get PDFObjective: Corifollitropin alfa is a good choice for assisted reproductive technology (ART) cycles because fewer injections are needed than with other agents. In this retrospective cohort, we analyzed luteal injected half-dose depot gonadotropin hormone-releasing hormone (GnRH) agonist cycles in women who received corifollitropin alfa and those who underwent a conventional corifollitropin alfa cycle with a GnRH antagonist.
Material and Methods: In this retrospective cohort, we analyzed luteal injected half-dose depot GnRH agonist cycles in women who received corifollitropin alfa and those who underwent a conventional corifollitropin alfa cycle with a GnRH antagonist at the Division of Reproductive Endocrinology and IVF Unit, Obstetrics and Gynecology Department, Baskent University School of Medicine, Adana, Turkey, from March 2014 to August 2015. The patient's baseline characteristics were similar between the two groups. Forty-five patients underwent the long protocol, in which a half-dose of depot GnRH agonist was administered on day 21 of the preceding cycle. Forty-nine patients underwent the GnRH-antagonist protocol. Corifollitropin alfa was administered on the menstrual cycle day 3.
Results: The mean ages of the two groups were similar (32.77+/-5.55 vs. 34.2+/-4.51 years ["for the long-and antagonist-protocol groups, respectively"]). The total number of retrieved oocytes, the fertilization rate, and the number of transferred embryos were similar between the two groups. The only significant difference between the two protocols was the number of injections during the controlled ovarian stimulation (COH) cycle, which included the depot-agonist injection in the long-protocol group (4.46+/-1.64 vs. 5.71+/-2.51, p=0.006). The clinical pregnancy and implantation rates were similar in the two protocols (16/45 [35.6%] vs. 16/49 [32.7%] for the intention to treat and 32.5+/-6.82% vs. 36.25+/-8.58%, respectively).
Conclusion: Our results show that ART cycles could be performed with fewer injections using corifollitropin alfa and a half-dose of depot GnRH agonist
Przegląd chorób układu krążenia w ciąży
No full textAbstract With recent advances in prenatal care, the incidence of direct causes of maternal death has declined and indirect causes have gained significant importance. Thromboembolism, hypertension and cardiovascular diseases are the most common indirect causes of maternal death. Acute myocardial infarction, stroke, venous thromboembolism, peripartum cardiomyopathy, aortic dissection and amniotic fluid emboli are responsible for the majority of the maternal deaths from cardiovascular causes. The issue of pregnancy of heart transplant – and Turner syndrome – patients requires extensive research. Obstetricians should possess good knowledge of cardiovascular complications of pregnancy because a high index of suspicion and early diagnosis, together with timely and appropriate interventions may save the life of the fetus and the mother.Streszczenie W związku z rozwojem medycyny, częstość występowania bezpośrednich przyczyn zgonów matek, np. krwotoków, znacząco się zmniejszyła. Jednak obserwuje się wzrost śmiertelności matek spowodowanych innymi, niebezpośrednimi przyczynami takimi jak: choroba zakrzepowo-zatorowa, nadciśnienie indukowane ciążą oraz choroby układu sercowo-naczyniowego. Zawał mięśnia sercowego, udar mózgu, zakrzepica żylna, kardiomiopatia okołoporodowa, tętniak rozwarstwiający aorty oraz zator płynem owodniowym są odpowiedzialne za większość przypadków śmiertelności matczynej wywołanej chorobami układu sercowo-naczyniowego. Na szczególną uwagę zasługują coraz częściej pojawiające się pacjentki po transplantacji serca oraz ciężarne z zespołem Turnera. Położnicy powinni posiadać rozległą wiedzę dotyczącą chorób układu krążenia i możliwych ich powikłań podczas ciąży, ponieważ wczesna diagnoza oraz właściwa interwencja mogą uratować życie płodu i matki
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