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Ottimizzazione delle tolleranze di sottosistemi automobilistici mediante prototipo virtuale
No full textOttimizzazione delle tolleranze di sottosistemi automobilistici mediante prototipo virtuale
No full textTools for the Interoperability among CAD Systems
No full textThe lack of interoperability among CAD systems due to the hard task to exchange efficiently CAD data is addressed in this work. The tools useful to guarantee the data exchange are analyzed and the strategies to be followed to prepare a CAD model and minimize information loss are investigated. The most critical problems in data exchange are the different internal mathematical representation schemes and the internal accuracy of the geometric definitions in the modeling kernel of the various CAD systems. In particular, the problems arise from the accuracy and the convergence criteria used when performing calculations with curves and surfaces. All this can occur either within the original system or during the pre- and post-processing phases of CAD data, performed with neutral format, like IGES or STEP. Inaccuracy can be due to several factors, like the different implementation of algorithms used during the translation, or when geometries are to be converted in another representation forms, or due to geometrical and topological model inconsistency. But the problems can also arise from inadequate geometric modeling in the original CAD environment. Some CAD systems do offer very useful tools to check and repair original and imported model geometry but, unfortunately, they do not automatically avoid information loss, especially when the models are complex. The author analyses what healing tools are available and important to repair a CAD model, and how to use them, as well as how to prepare a model to ensure CAD interoperability and prevent failure in data exchange via neutral standard formats
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
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