1,720,956 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
Pregnancy in advanced (≥ 40) and very advanced (≥ 45) reproductive age: Maternal and fetal risks
No full textAim of the study. The aim of our study is to evaluate the pregnancy complications, mode of delivery and neonatal outcome in women of advanced reproductive age (≥ 40 years) and very advanced reproductive age (≥ 45 years). Methods and materials. We selected 343 patients aged ≥ 40 years who subsequently gave birth at the Department of Obstetrics- Gynecology at the Policlinico Umberto I in Rome, between 2010 and 2011. We selected a control group of 527 patients aged between 25 and 35 who gave birth in the same period. After excluding twin pregnancies and intrauterine deaths, the study sample is made up of 312 patients, subdivided into two subgroups according to age: 40-44 years (group A: 274 patients) and age ≥ 45 years (group B: 38 patients), while the control group includes 510 patients. For each group we evaluated the pregnancy outcomes (chronic maternal diseases, gestational maternal diseases, obstetric complications), delivery (mode of delivery, gestational age at birth) and neonatal outcome (birth weight and Apgar). Obstetric history (parity and previous cesarean section), mode of onset of pregnancy (spontaneous or assisted reproductive technology) and duration of the hospital stay were reported. Results. We found in women over 40 compared to the control group a significant increase in the frequency of both chronic and gestational maternal diseases: diabetes mellitus (2.6% vs 0.4%), chronic hypertension (6.1% vs 2%), gestational diabetes (9% vs 2.5%), gestational hypertension (8.7% vs 2%); and of obstetric complications: oligohydramnios (7.4% vs 3.7%), intrauterine growth restricion-IUGR (6.7% vs 2.5 %); an increase of cesarean section (70.2% vs 48.2 %) and an increased risk of neonatal complications such as prematurity (20.8% vs 7.5%), low birth weight (17.3% vs 10.6%) and Apgar score less than 7 at the first minute (7.4% vs 1.6%) were evidenced in the study group. We found no significant differences in the frequency of preeclampsia, placental disorders (placenta previa, placental abruption), instrumental delivery. Considering only the group over 40, the comparison between group A (40-44 years) and group B (≥ 45 years) showed a significantly increased frequency of preeclampsia (1.5% vs 13.2%), gestational hypertension (5.8% vs 28.9%), cesarean section (67.2% vs 92.1%), low birth weight (15% vs 34.2%), prematurity (19.3% vs 31.6%) and Apgar score less than 7 at the first minute (5.8% vs 18.4%) in the patients ≥ 45 years. No significant differences emerged for maternal chronic diseases (hypertension, diabetes), for gestational diabetes, obstetric complications (oligohydramnios, IUGR, placental disorders) and instrumental delivery. Conclusions. The pregnancy in age ≥ 40 is associated with an increased risk for the majority of the maternal-fetal complications, but it is mostly over 45 years that the increase of frequency of gestational diseases involving the cardiovascular system becomes highly prevalent (gestational hypertension and preeclampsia); fetal complications such as low birth weight and prematurity are increased. © Copyright 2014, CIC Edizioni Internazionali, Roma
Hypertension and early menopause after the use of assisted reproductive technologies in women aged 43 years or older: Long-term follow-up study
No full textTherapeutic apheresis in pregnancy: three differential indications with positive maternal and fetal outcome
No full textTherapeutic apheresis (TA) is a complex extracorporeal procedure for the treatment of several acute and chronic diseases. TA in pregnancy is considered safe for both mother and fetus and has the same indications of non-pregnant patients. TA can be used during the entire course of the pregnancy with the following purposes: (i) to treat several maternal acute and chronic conditions; (ii) to treat fetal conditions; (iii) to avoid administration of drugs potentially harmful to the fetus; and (iv) to reach a more advanced gestational age in order to prevent fetal prematurity. We report three successfully treated patients throughout pregnancy, for differential indications: thrombotic thrombocytopenic purpura, red blood cells alloimmunization and ulcerative colitis. Multiple courses of TA have been performed without any complications for the mother and the fetus. A review and a discussion on the particular TA implications related to maternal-fetal medicine have been reported. When approaching TA in pregnancy, clinicians have to consider the severity of disease, the strength of the indications, and the gestational age. Each case must be evaluated individually on the basis of existing evidence since, despite the increasing use, specific guidelines for apheresis in pregnancy are still lacking
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
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