1,720,956 research outputs found
A domain adaptation methodology for enhancing the classification of structural condition states in continuously monitored historical domes
Full text linkThe unavailability of labeled data has always been the main limitation of data-driven solutions for monitoring the health state of full-scale structures. In this area, domain adaptation (DA) solutions have occasionally been proposed in recent years, which allow the sharing of data sets between distinct but similar systems. This paper presents a novel computational methodology to evaluate the condition state of historical buildings subjected to continuous monitoring. The DA method, specifically transfer component analysis, is used to maintain correlations between two data domains with low relevance, thereby improving the accuracy of classification models. Additionally, it is shown that the kernelized Bayesian transfer learning can enhance classification accuracy beyond what is achievable with a support vector machine. The paper is completed with a real-world application to the classification of data sets from two Italian Baroque churches, both characterized by imposing oval masonry domes, but equipped with very different monitoring systems
Experimental Design of Bistable Meta-panel for Dynamic Investigation
Full text linkBistable metamaterials offer a promising solution for vibration mitigation in structural systems. This research presents the conceptualization of the experiments for a bistable meta-panel, which uses geometric nonlinearity and snap-through instability to enhance energy absorption and dissipation. A scaled prototype, produced via additive manufacturing, undergoes static and dynamic testing to assess its response. This work provides a foundation for further development of meta-material-based seismic protection systems
Digital Twinning for the Prognosis of Spatial Architectures: Morandi’s Underground Pavilion in Turin
No full textConcrete spatial architecture was mainly built using techniques that at
the time were still experimental and based on design criteria that did not consider
seismic actions. The validity of accurate models accounting for such complex
structural schemes can be demonstrated, but the latter still would not support a
clear comparison with the original predictions.
Different from other Morandi’s balanced beam schemes, in the underground
Pavilion V of Turin Exhibition Center the main post-tensioned ribs are not parallel
beams but are diagonally directed and multiply reciprocally interconnected in
order to obtain a spatial structure offering a high overall rigidity and lateral stability,
and to contrast the instability of the very thin webs of the main ribs.
The paper focuses on how information from the experimental campaign can
help to formulate virtual models for prognostic and diagnostic assessments under
different scenarios, such as for example the design of structural health monitoring
activities and systems
Simulation and Identification of a Seismic Bistable Device with Hysteresis
Full text linkMechanical metamaterials with bistable configurations offer a promising solution for enhancing energy dissipation in existing structures subjected to dynamic excitations. This research focuses on a pre-buckled steel bistable device engineered for energy dissipation, examining the critical interplay between geometric nonlinearity and hysteretic behaviour. The classical Bouc-Wen model is here modified to incorporate the effects of bistability. The study includes parametric simulations and instantaneous identification of the proposed model parameters. Finally, an equivalent damping factor that considers both viscous and hysteretic dissipation is calculated
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
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