1,720,966 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
Brain potential evoked by spinal cord stimulation from D-Wave catheter at the end of resection of spinal cord tumors
No full textIntroduction
IntraOperative NeuroMonitoring (IONM) in spinal cord tumour surgery relies mostly onto the assessment of the integrity of the motor pathways, with Transcranial Motor Evoked Potentials, with the possible adjunct of Somatosensory Evoked Potentials from peripheral nerve stimulation.
In a few patients subjected to IONM during spinal cord tumour resection, we also recorded Brain Potentials (BP) from direct stimulation of the spinal cord, delivered through the epidural D wave catheter inserted caudally to the tumour. The BP was obtained at the end of resection and it was not used for IONM.
Materials and Methods
In three adult patients operated for dorsal spinal cord tumours (two intramedullary tumours, one extramedullary intradural tumour), the IONM was conducted with muscle MEP+D wave recording. PTN SEPs were obtained at intervals. At the end of resection, the D-wave catheter distal to the lesion was used for delivering direct spinal cord stimulation, with recording from Cz-C3'. A square wave pulse lasting 200-500 microseconds, intensity 9-10 mA, was used for stimulation and 10 sweeps were averaged on a 30 ms time base. Filter setting was 15-1500 Hz.
Result
A robust negative wave (BP) was recorded in the two patients with intramedullary tumours, peaking 6.2 ms (D3 stimulation), 6.1 ms (D1 stimulation), respectively. D wave peak latencies, recorded from the same catheter just before BP, were 5.4 ms and 4.6 ms, respectively. In the third patient (extramedullary meningioma) we could not record any reliable BP from D8 stimulation.
Conclusions
An ascending Brain Potentials could be evoked by direct spinal cord stimulation from the electrode recording distal corticospinal D wave in two adult subjects. Its peak latency was longer than D wave in both cases. This technique may be an adjunct to SEP from peripheral nerve stimulation. More experience is needed to assess its generators and its reliability for IONM
Osteosintesi e artrodesi circonferenziale in caso di "burst-split fracture" di L2
No full textWe present the case of a burst-split fracture of L2 presenting with paraplegia in a young woman. After surgical decompression and posterior L1–3 instrumentation the patient significantly improved and her consent to a second anterior approach was not given. Six months later, after a moderate lumbar trauma we documented a rupture of the pedicular screws with further L2 collapse and kyphosis. The patient was then submitted to revision of the posterior instrumentation and further anterior arthrodesis through an anterolateral retroperitoneal approach with implant of an expandable cage. The case confirms the low bone healing rate of this type of fractures in which a circumferential arthrodesis is mandatory
Osteosintesi e artrodesi circonferenziale in un caso di “burst-split fracture” di L2
No full textWe present the case of a burst-split fracture of L2 presenting with paraplegia
in a young woman. After surgical decompression and posterior L1-3
instrumentation the patient significantly improved and her consent to a
second anterior approach was not given. Six months later, after a moderate
lumbar trauma we documented a rupture of the pedicular screws with
further L2 collapse and kyphosis. The patient was then submitted to revision
of the posterior instrumentation and further anterior arthrodesis
through an anterolateral retroperitoneal approach with implant of an
expandable cage. The case confirms the low bone healing rate of this type
of fractures in which a circumferential arthrodesis is mandatory
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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