1,721,468 research outputs found
Proyecto gamificado con uso de Apps en una clase de formación profesional de acondicionamiento deportivo
No full textRosado Ortega, Alejandro; director de proyecto: Fernández Jiménez, Juan Antonio2021-2022Máster Universitario en Tecnología Educativa y Competencias Digitales DocentesFacultad de Estudios Sociales y Lenguas Aplicada
Diseño e implementación de un sistema de adquisición de datos y monitoreo de los generadores de un simulador experimental de laboratorio
No full textTesis (Maestría en Ingeniería Eléctrica), Instituto Politécnico Nacional, SEPI, ESIME Zacatenco, 2015, 1 archivo PDF, (198 páginas). tesis.ipn.m
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
Optimal welfare price for a highway competing with an untolled alternative: the influence of income distribution
No full textIn some countries, it is common for two roads with the same origin and destination to compete in the same corridor. Usually one of the roads is a toll highway of better quality, whereas the parallel single road is toll-free. The users have to decide whether it is worth paying for the advantages offered by the toll road. This problem, known as the untolled alternative, has been studied extensively. Particular attention has been paid to calculating the optimal welfare toll that maximizes the economic efficiency. However, there is a gap in the literature regarding how the income distribution affects the optimal toll. The main objective of this paper is to add knowledge in that area by analyzing the influence of the distribution of the values of travel time (VTT) of the users, which is closely related to their income distribution, on the optimal toll price. To solve this problem, the authors defined a mathematical model aimed at obtaining the optimal welfare price for this kind of corridor under the hypothesis that the drivers assume that the average flow conditions will prevail. Under the assumptions made in the paper and for the type of network studied, the results showed that the higher was the average VTT, the higher was the optimal price; and the higher was the dispersion (variance) of this VTT, the lower was the optimal price
Modelling some equality and social welfare impacts of road tolling under conditions of traffic uncertainty
No full textThis paper studies the combination of tolls that maximises equality in an interurban network with a toll highway and a free parallel single road which could be tolled as well. Equality is defined by a novel indicator which reflexes earlier equality definitions; it measures the proportion of travellers’ willingness to pay not consumed by the monetary transport costs with respect to their willingness to pay. Users are heterogeneous as their values of travel time (VTT) are different. The research also analyses how the VTT distribution affects this optimal combination. The authors conduct several numerical analyses and compare results under two cases: welfare maximization and equality maximization. For the type of network and users selected the results show that the higher the average VTT, the higher the optimal price, and the higher the dispersion (variance) of VTT, the lower the optimal price. Moreover, to optimize equality, the road should remain free. The most equitable scenario worsen high-income users whereas middle-income users benefit from it. More users are better off under the welfare scenario, which also leads to a higher overall surplus. Finally, welfare pricing and equality pricing schemes work oppositely but match for high traffic levels
Contractual PPPs for transport infrastructure in Spain: lessons from the economic recession
No full textIn this paper, we analyse the successes and failures of contractual public-private partnerships (PPPs) for delivering and operating transport infrastructure in Spain from the award of the first toll highway concession programme to the present. To that end, we show the risk allocation principles used in Spain and explore the evolution of the contracting approaches over the years. We found that the performance was reasonably good until the arrival of the economic crisis in 2008. Taking advantage of that, we make a review of contractual PPPs for different transport modes and assess the impact that the economic crisis has had on their business performance and the capacity of the central and regional governments to fulfil their commitments with the private sector. This analysis enabled us to identify measures that, if had been applied, would have improved the resilience of these contract during the economic crisis
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