1,721,127 research outputs found
Handbook on Digital Twin and Artificial Intelligence Techniques for Rail Applications
No full textWith contributions from experts from around the world, this handbook aims to systemize the exist-ing experience and knowledge that can be used to the development of more efficient and controlled railway systems. As a result, this handbook showcases the modern methods, methodologies and frameworks for the development of DT and AI architectures and apparatus in the area of the exist-ing railway systems and transport engineering tasks. The chapters cover such varied and specialized topics as the processes related to the transformation of a physical twin into a digital twin; the appli-cation of data-driven and physics-based simulation approaches in the development of digital twins; asset management application tasks with the implementation of DT and AI; and the experimental and field applications of the DT and AI concepts and technologies in railway transport system design and predictive maintenance tasks. Handbook on Digital Twin and Artificial Intelligence Techniques for Rail Application..
Longitudinal train dynamics and vehicle stability in train operations
No full textCole, CR ORCiD: 0000-0001-8840-7136This chapter has been designed to provide a hands-on guide to both understanding and analysing longitudinal train dynamics. It is specifically focussed on the longitudinal dynamics of heavy-haul trains and adds new insights to previous work by the author [1–4], along with recent modelling
work relevant to passenger trains [5]. It is 12 years since the first edition and the draft gear section is now expanded. New to the chapter is material concerning lateral wagon stability in the presence of lateral coupler force components. Passenger comfort and crashworthiness sections are also updated
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Data Collection and Management for Digital Twins
No full textSeveral technologies have been recently introduced to enhance the availability of real-time data streams from industrial processes and services, coupled with significant advancements in computing capabilities. The increased visibility of system conditions in real-time has stimulated the development of methods to optimize the system performance in the short term.
Central to these advancements is the tight integration of digital models with physical production systems, making the study and development of digital twin (DT) architectures critical. This chapter presents a state-of-the-art review of DT evolution focusing on data collection and the elaboration of data into digital models. Additionally, this chapter addresses the research gaps and implementation challenges that must be overcome to achieve widespread adoption of DTs in the industry
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
Introduction
No full textCole, CR ORCiD: 0000-0001-8840-7136; Mcsweeney, TC ORCiD: 0000-0003-3098-2423; Spiryagin, M ORCiD: 0000-0003-1197-898XThe principal aim of this handbook is to present a detailed introduction to the main issues influencing the dynamic behaviour of railway vehicles, and a summary of the history and the state of the art of the analytical and computer tools and techniques that are used in this field around the world. The level of technical detail is intended to be sufficient to allow analysis of common practical situations, but references are made to other published material for those who need more detail in specific areas. The main readership will be engineers working in the railway industry worldwide and researchers working on issues connected with railway vehicle behaviour, but it should also prove useful to those wishing to gain a basic knowledge of topics outside their specialist technical area
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