1,721,300 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
A Time-domain 3-D full-Maxwell solver based on the Cell Method
No full textA full-Maxwell numerical algorithm based on the cell method, which is similar to finite-difference time-domain or FIT but allows complete freedom on the mesh, is presented in this paper. The algorithm can be used with tetrahedral or hexahedral primal meshes. The numerical scheme is explicit, does not need the introduction of new variables or local matrix inversions (as, e.g., in the microcell method), and allows the use of phase-matched layer type boundary conditions
Decision Making in Patients With Concomitant Otosclerosis and Superior Semicircular Canal Dehiscence: A Systematic Review of the Literature
No full textOBJECTIVE: Concomitant otosclerosis (OTS) and superior semicircular canal dehiscence (SSCD) is a rare, but difficult-to-identify and treat diagnosis. A systematic review of the literature was performed to analyze the diagnostic and therapeutic approaches of concurrent OTS and SSCD cases and to identify possible factors that may help in predicting the surgical outcome. DATA SOURCES: PubMed, Scopus, Medscape, Ovid databases. STUDY SELECTION: Studies showing diagnosis of OTS documented by audiometric test with or without associated radiological signs (computed tomography), and concomitant diagnosis of SSCD, documented at least by high-resolution computed tomography (and possibly supported by neurophysiological testing) were included. Both surgically treated and untreated patients were considered for data analysis. DATA EXTRACTION: The general characteristics of each study were recorded, when available. Clinical, audiological, vestibular testing, surgical, and radiological data were extracted from the published case reports and series, and recorded on a database. For each case, the diagnostic steps that confirmed OTS and concomitant SSCD in the same ear were extracted. DATA SYNTHESIS: Twelve studies were included in the review and 18 cases affected simultaneously by the 2 conditions were extracted and analyzed. Seven of 12 ears (58.3%) undergoing stapes surgery experienced a hearing improvement. In four (33.3%) cases, vestibular symptoms (with or without associated acoustic symptoms) of SSCD were unmasked or worsened by stapes surgery. CONCLUSIONS: A reliable preoperative diagnosis of the two concomitant conditions is possible with a proper interpretation of clinical signs, audiometric, and vestibular testing, in association with the radiologic assessment. Despite that the length and the location of the dehiscence may guide the surgical decision, definitive conclusions regarding the appropriate indications for surgical treatment cannot be drawn due to the limited number of cases with adequate data reported in the literature
A WWW-based tool for the remote optimization of electromagnetic devices
No full textIn this paper, a World Wide Web-based tool for the remote definition and analysis of optimization problems in electromagnetic design is described. The tool can find effective applications both in advanced teaching and in industrial design activities, thanks to its user-friendliness. The architecture of the system and its current implementation, based on commonly available tools, are presented and discussed in detail. Examples of the use of the tool for the design of a magnet to be used in high energy physics experiments and a simple electromagnetic actuator are give
Optimisation of electromagnetic problems with uncertain parameters and tolerances in the design variables
No full textThe common approach to continuous and discrete optimisation problems in electromagnetics does not take into account uncertainties and variations of the design variables. Local sensitivity analysis is usually performed only after the optimisation run to study the behaviour of the objective function in the neighbourhood of the optimum. However, this procedure may prove inefficient if the optimum has to be rejected due to sensitivity considerations and a new run has then to be performed. In this paper an alternative approach, which takes into account uncertainties in the design variables and physical data, is presented, and an analytical function is used to highlight the features of the proposed method. The essence of the technique is to couple the optimisation with a series of worst case analyses which are embedded in the optimisation loop. The method is fully general and can be applied to any optimisation method. The additional computational costs associated with the procedure maybe relatively high, but in the authors’ opinion the obtained gains in user confidence in the solution and the computational savings in some cases far offset the possible drawbacks of the method
A combined advancing-front/Delaunay technique for the meshing of curved surfaces in 3D
No full textA combined advancing-front/Delaunay technique for the generation of triangular meshes on curved surfaces in 3D is presented. It is shown that geometrical considerations, which would be extremely beneficial from a theoretical point of view, cannot be applied in general in the case of the objects which have to be meshed in computational electromagnetics. The method presented in this paper is based on a combination of advancing-front and Delaunay techniques applied to local parametrizations of the surfaces to be meshed, and is able to treat surfaces with holes and thus with non-connected boundaries. The implemented techniques are described in detail and an analysis of the computational complexity of the algorithms and a description of the supporting data structures are presented
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