1,721,121 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
Abnormalities of the contingent negative variation in Huntington's disease: correlations with clinical features
No full textDispelling 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
EFFECTS OF RIVASTIGMINE ON MOTOR AND COGNITIVE IMPAIRMENT IN HUNTINGTON'S DISEASE
No full textAbstract. To evaluate the efficacy of rivastigmine on motor
and cognitive impairment in Huntington’s disease (HD), we
carried out a prospective, open-label, randomized, controlled
study. Twenty-one HD patients were enrolled: 14 were randomly sorted into medication and 7 to no-treatment groups. Clinical and demographic features were similar between groups. After 8 months, an efficacy evaluation was carried out to compare the two groups. The improvement of cholinergic transmission in HD patients seemed to have a slight effect in ameliorating cognitive performance and slowing motor deterioration
Open label, long-term, pragmatic study on levetiracetam in the treatment of juvenile myoclonic epilepsy.
No full textPURPOSE: Patients with juvenile myoclonic epilepsy (JME) may be resistant or show adverse effects to valproate. We present a multicenter, prospective, long-term, open-label study evaluating the efficacy and safety of levetiracetam in JME.
METHODS: Patients with newly diagnosed (10) or resistant/intolerant to previous AEDs JME (38) were enrolled. After a 8 week baseline period, levetiracetam was titrated in 2 weeks to 500 mg b.i.d. and then increased up to 3000 mg/day
according to the patient's response. Efficacy parameters were: number of seizure-free patients, number of days with myoclonus (DWM), and monthly frequency of generalised tonic-clonic (GTC) seizures. Adverse events were recorded.
RESULTS: The overall mean dose of levetiracetam was 2208 mg/day. The mean study period was 19 (range 0.3-38) months. Five patients dropped out. 11/38 (28.9%) patients with add-on treatment and 5/10 (50%) newly diagnosed patients were seizure-free for a mean period of 17.2 (+/-8.8) months. Eighteen patients (37.5%) were without myoclonia, and 35 (72.9%) had no GTC seizures over the study period.
The mean monthly frequency of DWM and of GTC seizures in the entire group was significantly reduced after levetiracetam. Five patients complained of side effects.
CONCLUSIONS: This open-label study suggests levetiracetam may be effective and well tolerated in resistant cases of JME or may become a reasonable alternative to valproate in newly diagnosed patients
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