1,721,021 research outputs found
Seismic design and retrofit of frame structures with hysteretic dampers: a simplified displacement-based procedure
No full textThis paper describes an effective and easy to use displacement-based procedure for seismic design or retrofit of frame structures equipped with hysteretic dampers, taking into account the flexibility of the supporting brace that is usually provided to connect the device to the external frame. The proposed framework leads the designer to the definition of a complete set of dissipative braces mechanical properties able to provide a desired performance level. Some initial assumptions related to the equivalent damped brace system have to be set and checked throughout the procedure. The method is widely explained step by step, differentiating the case of linear elastic and nonlinear behavior of the bare frame. The capacity curve of the braced frame is built by means of simple analytical relations and approximated by a bilinear or trilinear curve depending on the bare frame behavior. Two case studies are provided to demonstrate the effectiveness of the suggested procedure for both cases of new construction and existing building, obtaining a satisfactory matching between analytical target and numerical capacity curves. The reliability of the design framework is finally assessed by means of static and dynamic nonlinear analyses
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 BIM-based decision-making framework for optimal seismic retrofit of existing buildings
No full textThe selection of the most suitable seismic retrofit strategy for an existing building may represent a challenging task, due to the multitude of technical solutions available, as well as to conflicting criteria involved in the decision-making process. Such an assessment encompasses several steps in which considerable data sets need to be gathered, stored, managed and exchanged between different project stakeholders, in order to provide a clear understanding of the as-built conditions along with the specific design options. In this context, Multi-Criteria Decision-Making (MCDM) methods represent a viable decision support system when different alternatives need to be evaluated according to a group of criteria, whereas the Building Information Modelling (BIM) methodology is a consolidated collaboration tool for data management and visualisation for construction projects. In this work, an integrated framework is proposed to increase the level of awareness of the Decision Maker (DM) in taking decisions exploiting the capabilities offered by BIM methodology integrated within a MCDM approach. First, the MCDM-BIM framework is presented and the potential benefits due to BIM in MCDM problems for seismic retrofit are highlighted. Then the idea is applied to a RC-frame building case study, modelled in a BIM environment. Three decision-making scenarios are simulated by considering different DM profiles and retrofit strategies. The alternative interventions are evaluated according to a set of criteria by employing data retrieved from the BIM model. Finally, the optimal solution is assessed for each decision-making scenario
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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