1,721,238 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
Current state of art for transplantation paradigms in peripheral T-cell lymphomas
No full textPeripheral T-cell lymphomas (PTCLs) are a rare and aggressive lymphoproliferative disorder characterized, with few exception, by poor prognosis. A correct diagnosis is still hampered by the heterogeneity and rarity of disease. Historically, PTCLs were treated like aggressive B-cell lymphoma with anthracycline-based combination chemotherapy with disappointing results. Neither dose intensification nor dose escalation of chemotherapy has been successful in prolonging the survival of PTCL patients. Due to this discouraging scenario, new therapeutic strategies have been tested. A therapeutic program including hematopoietic stem-cell transplantation (SCT) may represent an interesting strategy for high-risk patients. Although no randomized trials are available, autologous SCT may offer a chance of cure in chemosensitive disease. Nonmyeloablative allogeneic SCT has shown a curative potential with limited toxicity, and it is actively being investigated. We will review the role of the current therapeutic approach to PTCL focusing on the most recent advances in SCT
Hematopoietic stem cell transplantation in peripheral T-cell lymphomas
No full textPeripheral T-cell lymphomas (PTCL) are a rare entity with a dismal outcome. After conventional chemotherapy they showed a worse prognosis compared with B-cell non-Hodgkin's lymphoma (NHL), except for anaplastic lymphoma-kinase (ALK)-positive anaplastic large cell lymphomas (ALCL). High-dose chemotherapy followed by autologous stem cell transplantation (SCT) has been evaluated in relapsed patients as well as in the upfront setting. Available data showed an advantage for patients who received transplant as first line treatment whereas results of autografting at relapse have been satisfactory only for ALK-positive ALCLs compared to other PTCL subtypes. Based upon preliminary results, allogeneic SCT can be also considered as an alternative strategy in these lymphomas. Whether or not the postulated graft-versus-lymphoma effect may overcome the poor prognosis of T-cell NHL patients has to be established
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