1,721,087 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
Remission of refractory neurosarcoidosis treated with brain radiotherapy: A case report and a literature review
No full textSarcoidosis is a chronic disease of unknown etiology characterized by the presence of T lymphocytes, mononuclear phagocytes, and noncaseating epithelioid granulomas in the tissues. Central nervous system involvement occurs in about 5% of the cases. The chronic form of neurosarcoidosis is particularly resistant to medical treatments. No universally accepted therapeutic protocols are currently available. Corticosteroids are the first line of therapy, but other immunosuppressive treatments are frequently added to the patient's regimen, although this strategy is not adequately supported by controlled clinical trials. For patients resistant to or not tolerating multiple alternate immunotherapeutic drugs, some authors suggest central nervous system radiotherapy. We present a case of a patient with neurosarcoidosis involving the hypothalamo-hypophyseal region and causing panhypopituitarism who had a poor response to and experienced severe side effects from conventional immunosuppressive treatments. The patient experienced a good clinical response to cranial irradiation. We review the literature on this subject. © 2008 Lippincott Williams & Wilkins, Inc
Correlation between dosimetrical data and rectal bleeding in radiotherapy of prostate cancer: a retrospective analysis
No full textThe purpose of current study is to search for possible correlation between dosimetry-clinical-technical parameters and late grade II/III rectum bleeding through a retrospective analysis of 175 patients (conformal: 115; non-conformal: 60) treated in the two Institutes for prostate carcinoma with curative or adjuvant intent (ICRU dose ranging from 60 to 76 Gy) in the years 1994-1998. The dose -volume-histograms (DVH) and dose statistics were collected together with a number of clinical and technical/dosimetry data. Mean, median and maximum dose and the fraction of rectum receiving more than 50, 55, 60, 65, 70 and 75 Gy were considered (V50,55,60,65,70,75). Rectal toxicity was scored through the RTOG/EORTC scale [1]: minimum follow-up was 15 months. 23/ 175 patients (13.1%) experienced grade II-III bleeding (grade III: 1/175). Posterior wall irradiation (more than 2 cm, 33% vs. 8.5%) and type of technique (conformal or not, 6% vs. 26%) were significantly correlated with the risk of grade II/III bleeding (p < 0.001. chi (2) test). When considering the greater than or equal to 70 Gy patients (n = 126) a number of constraints resulted to be significant (chi (2) test): mean dose ( greater than or equal to 57 Gy, p = 0.03); median dose ( greater than or equal to 64 Gy, p = 0.025); V70 ( greater than or equal to 35%, p = 0.025); V65 ( greater than or equal to 48%, p = 0.03) V50 ( greater than or equal to 69%, p = 0.04)
A Rare Case of Epididymal Metastasis After Radical Prostatectomy Detected by 68Ga-PSMA PET/CT.
No full textDisease relapse occurs within 10 years from primary
treatment in the 30% of patients who underwent
radical therapy for prostate cancer.
In the majority of cases, the disease relapse occurs in
lymph nodes or bone. Lung, liver, pleura, and brain are
rarely described as site of relapse. However, other
uncommon sites of the disease are described in
literature.
In patients with a high risk of recurrence, positron
emission tomography/computed tomography imaging
plays a fundamental role in detecting the site of
relapse. Thus, an early detection of the recurrence is
important in order to refer patients to metastasisdirected
therapy.
We report a case of a patient with biochemical relapse
and right epididymis 68Ga-prostate-specific membrane
antigen uptake who underwent an orchiectomy,
according to positron emission tomography/
computed tomography results.
Histologic analysis of the specimen revealed
the presence of prostate cancer cell diffusion. A
biochemical response after surgery was observed
(baseline prostate-specific antigen levels 1⁄4 0.56 ng/
mL; postsurgery prostate-specific antigen levels 1⁄4
0.12 ng/mL
Intra-arterial hepatic chemotherapy (IAHC) with a percutaneuos transaxillary placement of arterial device: Efficacy of an innovative approach
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
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