1,720,956 research outputs found
Desarrollo de un modelo de asignación flexible y dinámico de recursos en aerolíneas.
No full textThe air transport industry is governed by fierce competition between the different airlines, which are fighting to gain market share by offering better connections at more affordable prices. This competition intensifies the search for methods to reduce costs in order to offer lower prices and maintain the attractiveness of their offer. With this perspective, operations research was born. Operations research is based on the optimization and analytical study of the strategy and planning of the airline's operations. These expand to all areas of operations planning, and analyzes from which flights will be flown to which crew will fly each flight, including which aircraft will be assigned to the operation and which flight routes the aircraft will follow. A model realistic enough to reduce costs in operations can be characterized in this work from the modeling of the delay. This modeling allows a more detailed study of how the delay affects the income statement of an airline. It starts with empirical data that allows determining the probability distribution of the minutes of delay and ends with the use of pseudo-random variables simulating scenarios with different probabilistic values of these delays. Studying how they affect the operating cost. In addition, the strategy of time buffers used by the Ryanair airline is studied in terms of effectiveness and compared with the proposed method.Objectius de Desenvolupament Sostenible::9 - Indústria, Innovació i Infraestructur
Desarrollo de un modelo de asignación flexible y dinámico de recursos en aerolíneas.
Get PDFThe air transport industry is governed by fierce competition between the different airlines, which are fighting to gain market share by offering better connections at more affordable prices. This competition intensifies the search for methods to reduce costs in order to offer lower prices and maintain the attractiveness of their offer. With this perspective, operations research was born. Operations research is based on the optimization and analytical study of the strategy and planning of the airline's operations. These expand to all areas of operations planning, and analyzes from which flights will be flown to which crew will fly each flight, including which aircraft will be assigned to the operation and which flight routes the aircraft will follow. A model realistic enough to reduce costs in operations can be characterized in this work from the modeling of the delay. This modeling allows a more detailed study of how the delay affects the income statement of an airline. It starts with empirical data that allows determining the probability distribution of the minutes of delay and ends with the use of pseudo-random variables simulating scenarios with different probabilistic values of these delays. Studying how they affect the operating cost. In addition, the strategy of time buffers used by the Ryanair airline is studied in terms of effectiveness and compared with the proposed method.Objectius de Desenvolupament Sostenible::9 - Indústria, Innovació i Infraestructur
SESAR 3 ER 2 STEPLESS D3.1 - ATM Validation Plan
No full textD3.1 "ATM Validation Plan" defines the framework for validating the STEPLESS solution from an ATM perspective. It defines structured procedures, scenarios, and evaluation methods to assess the solution's performance, adaptability, and integration into real-world ATM operations, ensuring its
effectiveness in addressing operational challenges and environmental goals.Preprin
SESAR 3 ER 2 STEPLESS D3.1 - ATM Validation Plan
No full textD3.1 "ATM Validation Plan" defines the framework for validating the STEPLESS solution from an ATM perspective. It defines structured procedures, scenarios, and evaluation methods to assess the solution's performance, adaptability, and integration into real-world ATM operations, ensuring its
effectiveness in addressing operational challenges and environmental goals.Preprin
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
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
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