1,721,282 research outputs found
Enhancing techno-economic assessments in aeronautic product development with systematic uncertainty management
No full textThis thesis investigated the enhancement of transparency and reproducibility in technoeconomic assessments (TEAs) for aeronautical product developments when input parameter uncertainties are present. The primary objective was to overcome identified barriers in the adoption of a systematic uncertainty management methodology. These included methods for the separation of relevant and negligible uncertainties, the application of Dempster-Shafer Theory of Evidence (DSTE) under data scarcity, as well as the combination of epistemic (knowledge-based) and aleatory (variability-based) uncertainties. By linking these barriers with systematic and comparative analyses, the findings of this dissertation provide a robust framework for effective uncertainty management in TEAs, promote the field of innovative aeronautic product development, and improve decision-making processes under uncertainty. To illustrate the developed uncertainty management methodology, a recurring case study on the lifecycle-based TEA of Hybrid Laminar Flow Control (HLFC) was utilized, drawing on information from two European projects. This case study served as a realistic and interdisciplinary example to demonstrate the quantification of input and output uncertainties, as well as other UQ methods addressed in this thesis. A significant contribution of this dissertation was the investigation of the strengths and weaknesses of various Global Sensitivity Analysis (GSA) techniques, which quantify the individual criticality of parameter uncertainties. Unlike conventional approaches that often select GSA methods without clear criteria, this research systematically assessed their capabilities, interpretability, and computational efficiency. The identified and partially significant differences underscore the necessity for an informed and context-specific selection of GSA techniques. Additionally, the Python package dste was developed to address the need for user-friendly programming toolboxes for handling DSTE-based UQ. Related analyses demonstrated the capabilities of the package and discussed the application of DSTE through systematic expert interviews and theory-specific UQ metrics. Furthermore, the associated interpretation difficulties, particularly concerning the recipients of the TEA, and the challenges related to computational efficiency were examined. The research also explored methods for combining epistemic and aleatory uncertainties and proposed a novel approach that integrates DSTE-based and probabilistic UQ approaches using nested Monte Carlo simulations. This approach enhances interpretability and computational efficiency compared to a purely evidence-theoretic approach and provides a nuanced representation of uncertainties. Decision-makers benefit from clearer insights through understandable visualization and straightforward interpretation, while users can derive tailored recommendations due to the clear separation of epistemic and aleatory effects. Additionally, this approach offers repeatability, allowing UQ to be consistently applied and repeated throughout the product development process as new information becomes available
A probabilistic multi-criteria decision making technique for conceptual and preliminary aerospace systems design
No full textPh.D
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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