1,721,001 research outputs found
Sonographic diagnosis of congenital anomalies during the first trimester
No full textCurrent ultrasound technology allows an examination of fetal anatomy and the detection of anomalies at 12-15 weeks. Studies assessing the accuracy of early sonographic diagnosis prior to 15 weeks of pregnancy were reviewed. In expert hands the detection rate is about 40 per cent for major extra-cardiac anomalies and 65 per cent for major cardiac defects. However, due to technical and practical limitations, sonographic assessment of fetal anatomy in the first trimester cannot replace the midtrimester scan and should be restricted to couples whose fetus is at increased risk for malformation
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
Pattern analysis for ultrasound anomalies in fetuses with normal karyotype
No full textTwo hundred cases of double or multiple anomalies (up to five in the same fetus) out of 828 karyotypically normal fetuses with at least one ultrasound finding were enrolled in the present study. One hundred and sixty patterns belonging to 200 fetuses were found. Then, we included in the final analysis only those double or triple patterns of anomalies with frequency more then 1. Thus, 123 cases and 83 patterns were analyzed. A double pattern was intended as any combination of ultrasound findings present in the same fetus. Exact Chi-square test was used to evaluate the specificity of the association of the most frequent patterns. The association of patterns was expressed as ratio between observed and expected frequency (O/E) ratio. Pattern analysis was used as statistical toot to calculate the number of possible associations of ultrasound finding. Anomalies of fluid distribution, as well as Central Nervous System malformations, and facial malformations were among the most significant associations. Among the triple patterns, Cleft Lip + Cleft Palate + Holoprosencephaly showed the highest degree of association. Antenatal diagnosis of ultrasound finding can benefits by considering the present results
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
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