1,721,051 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
VALIDATION OF THE SIMPLIFIED DISEASE ACTIVITY INDEX (SDAI) AND DAS28 AS MEASURE OF RESPONSE TO TREATMENT IN PATIENTS UNDERGOING DIFFERENT THERAPEUTIC REGIMENS
No full textBackground: SDAI is a newly established outcome measure in patients with Rheumatoid Artrhritis (RA) that can be used to quantify disease activity as well as to measure change over time (1). It has been validated in patients undergoing leflunomide as disease modifiyng antirheumatic (DMARD) therapy.
Objectives: To validate SDAI in RA patients undergoing different DMARD regimens.
Methods: 88 patients (F/M 72/16; Age 45±12.7; disease duration 12.4 ± 7.8; RF positivity 63/25)with active rheumatoid artrhitis (as defined by a DAS 28 >5.1) were prospectively enrolled in the study. The patients were randomly assigned to one of four groups according to the therapeutic regimens: group I: Methotrexate (MTX) 15 mg/weekly + salazopyrin 2 g/daily; group II: MTX 15 mg/weekly + infliximab 3 mg/kg at time 0, 2, 4 and every 8 weeks; group III: MTX 15 mg/weekly + etanercept 25 mg/twice weekly; group IV: MTX 15 mg/weekly + adalimumab 40 mg/every two week. SDAI and DAS28 were determined at baseline and after 6 months in each patient. Absolute and mean changes in SDAI values were compared to those detected in DAS 28.
Results: SDAI and DAS 28 were found to be significantly correlated at baseline. Moreover, chenges in SDAI over time paralleled those in DAS, and were found to be significantly correlated (Table 1).
Table 1
Group I 0 Group I 6 Group II 0 Group II 6 Group III 0 Group III 6 GroupIV 0 Group IV 6
DAS28 6.47±1.39 4.74±1.6 6.13±1.5 4.1±1.65 5.89±1.1 3.53±1.14 5.99±1.2 4.19±1.22
SDAI 56.9±12 35±11.8 58.9±12.9 40.8±11.4 61.6±9.96 44.8±7.20 63.8±7.5 44.7±9.11
p <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001
Conclusion: SDAI is a valid measure of response to treatment in RA patients undergoing different therapeutic regimens
References: 1. Rheumatol 42: 244-257; 200
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
Complete hardware package for a fault tolerant flight control system using on-line learning neural networks
No full textThis paper shows the results of a research effort focused on demonstrating the capabilities of hardware based on-line learning parallel neural networks featuring neural schemes for fault-tolerant capabilities in a flight control system. Particularly, for a given aircraft mathematical model, 2 different fault-tolerant schemes have been implemented in different neural networks embedded on a motherboard with 4 TMS320C40 DSPs. The first scheme provides sensor failure detection, identification, and accommodation (SFDIA) for different types of sensor failures within a flight control system assumed to be without physical redundancy in the sensory capabilities. The second scheme provides actuator failure detection, identification and accommodation (AFDIA) for different actuator failures. Emphasis has been placed to ensure real-time capabilities as well as an efficient integration between the AFDIA and the SFDIA schemes without degradation of performance in terms of false alarm rates and incorrect failure identification. The results of the simulation following different types of failures are reported
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