1,720,980 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
Abstracts of CIRSE (Cardiovascular and Interventional Radiological Society of Europe) 2010. October 2-6, 2010. Valencia, Spain
No full textAppropriate 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
Ablation of large HCCs using a new saline-enhanced expandable radiofrequency device()
Full text linkEvaluation of a new device designed to achieve large volumes of necrosis in hepatocellular carcinoma (HCC) nodules by application of radiofrequency ablation (RFA)
Seeding from hepatocellular carcinoma after percutaneous ablation: color Doppler ultrasound findings.
No full textBACKGROUND: We describe the clinical and color Doppler ultrasound findings in a series of cases of seeding from hepatocellular carcinoma (HCC) observed in patients treated with percutaneous ablation therapy (PAT) over a 15-year period. METHODS: We reviewed the clinical and imaging records of 12 patients with cirrhosis (nine men and three women, age range 51-82 years, mean age 63 years) that showed neoplastic seeding from HCC occurring after one or more PAT procedures. Five of 12 cases of seeding were observed as a complication of 1080 PAT procedures (0.46%) performed in 545 patients (0.96%) by two of the authors (L.T., G.F.) over a long period (15 years) at different institutions. The other seven patients had been treated with PAT procedures at other institutions and had come to our attention during post-treatment follow-up. RESULTS: The 12 patients who had seeding nodules had undergone the following PAT procedures: multisession conventional percutaneous ethanol injection (PEI) without anesthesia (four patients), single-session PEI with general anesthesia (three patients), single-session PEI with general anesthesia plus multisession conventional PEI (four patients), and single-session PEI plus radiofrequency ablation (one patient). Seeding nodules ranged from 0.9 to 6.0 cm (mean 1.7 cm). Eleven of 12 seeding nodules appeared as hypervascular hypoechoic nodules with smooth and regular margins and multiple intralesional vascular signals. CONCLUSIONS: Clinical and imaging findings of seeding from HCC should be recognized by physicians who perform follow-up ultrasound examinations of patients who are treated with PAT. Early diagnosis of seeding can be reliably made by scanning the abdominal wall with small probes in the area where the previous PAT has been performed. Hypoechoic hypervascular pattern of the seeding nodule allows definitive diagnosis
Percutaneous ethanol injection of hyperfunctioning thyroid nodules: long-term follow-up in 125 patients.
No full textOBJECTIVE. The purpose of this study was to assess the long-term efficacy of percutaneous
ethanol injection (PEI) for the treatment of hyperfunctioning thyroid nodules.
MATERIALS AND METHODS. One hundred twenty-five patients (88 women, 37
men; age range, 17–76 years; mean age, 53 years) with 127 hyperfunctioning thyroid nodules
(volume, 1.2–90 mL; mean, 10.3 mL) were treated with PEI. There were 1–11 PEI sessions
per patient (average, 3.9) performed, with injection of 1–14 mL of ethanol per session (total
injected ethanol per patient, 3–108 mL; mean, 14.0 mL). Efficacy of the treatment was assessed
with color Doppler sonography; scintigraphy; and free triiodothyronine (FT3), free
thyroxine (FT4), and thyroid-stimulating hormone (TSH) assays. Follow-up (9–144 months;
median, 60 months) was performed with TSH and color Doppler sonography every 2 months
for 6 months and every 6 months thereafter.
RESULTS. Three (2.4%) of 125 patients refused completion of PEI therapy because of
pain. Results are reported in 122 patients with 124 nodules. All 122 patients showed posttreatment
normal levels of FT3, FT4, and TSH. A complete cure (absent uptake in the nodule
and recovery of normal uptake in the thyroid parenchyma) was obtained in 113 (93%) of 122
patients—115 (92.7%) of 124 treated nodules. Residual hyperfunctioning nodular tissue along
with decreased thyroid parenchyma uptake (partial cure) was present in nine patients accounting
for nine (7.3%) of 124 nodules. Rates of complete cure after PEI were: overall nodules,
115 (92.7%) of 124; nodules ≤ 10 mL, 63 (94.0%) of 67; nodules > 10 to ≤ 30 mL, 32
(91.4%) of 35; nodules > 30 to ≤ 60 mL, 17 (89.5%) of 19; nodules > 60 mL, three (100%) of
three. The overall rate of major complications (transient laryngeal nerve damage, two patients;
abscess and hematoma, one patient each) was four (3.2%) of 125 patients. Follow-up
examinations showed marked shrinkage of 112 treated nodules ranging from 50% to 90% of
the pretreatment volume (mean, 66%) and new growth of hyperfunctioning tissue in four
patients at color Doppler sonography and scintigraphy at 12, 18, 18, and 48 months’ follow-up,
respectively. However, all patients remained euthyroid (low or normal TSH and normal FT3
and FT4) during follow-up.
CONCLUSION. PEI of hyperfunctioning thyroid nodules seems to be an effective and
safe alternative to traditional treatment. It also appears to be effective in patients with hyperfunctioning
thyroid nodules larger than 30 mL
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
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