1,721,119 research outputs found
Aggregations functions: a multivariate approach using copulae
No full textIn this paper we present the extension of the copula approach to aggregation functions.
In fact we want to focus on a class of aggregation functions and
present them in the multi linear form with marginal copulae.
Moreover we will define also the joint aggregation density function
Multivariate dependence modelling with copulas
No full textWorking Papers Department of Applied Mathematics(IDEAS)183
ISSN: 1828-688
A flow-informed strategy for ballistic capture orbit generation
Full text linkBallistic capture is a phenomenon by which a spacecraft approaches its target body, and performs a number of revolutions around it, without requiring manoeuvres in between. Capture orbits are characterized by specific dynamics, defining regions that guide transport phenomena. Because of the limitations associated with existing approaches, the development of heuristics informed by Lagrangian Coherent Structures appears desirable. In fact, such structures identify transport barriers in dynamical systems, separating regions with qualitatively different dynamics. In this work, different flow-informed approaches are presented, and their relations with ballistic capture are discussed. A new heuristic, the time-varying strainline, is introduced. This new tool is applied to compute ballistic capture orbits around Mars. Different degrees of model fidelity have been investigated, mainly in order to test the robustness of the proposed technique with respect to different features of the underlying dynamical model. We show that time-varying strainlines are useful in identifying ballistic capture orbits
Bivariate copula-based aggregation operators
No full textThis paper presents the role of copulafunc-
tions in the theory of aggregation operators.
In this context we are focusing our attention
abouts everal properties of aggregation
functions,like supermodularity andSchur-
concavity, studying also a decompositionof
supermodular binary aggregation operators
and copulae
Five years of gender research in the public sector by the IPAZIA Observatory: a review of the studies and a research agenda.
No full textThe issue of gender equality in public organizations is a relevant subject of academic and practitioners’ management debate as gender balance represents a symbol of democracy and good governance, leading to a more equitable and sustainable economy and improving trust in public entities. It has also attracted the attention of institutions and society, as confirmed by the commitment in European financial programs Horizon 2020 and Horizon 2021-2027. Nevertheless, women under-representation in workplaces still exists and scholars highlight the need to conceptualize the effect of gender in public employment, with a broader perspective in terms of settings and sectors. The study aims to address these requirements through a literature review on gender and public sector considering the studies on the topic published by the IPAZIA Observatory since its inception, both in volumes and in conference proceedings. Mainly using qualitative methods, the papers analysed show that public institutions are strongly gendered and do not allow women equal work opportunities compared to men, especially in technological fields. However, encouraging women's involvement in public organizations may have a positive effect on public administration outcomes as female engagement creates high level of cooperation reducing conflicts, generates a positive push for innovation and in co-production of corporate value. Besides, our results prove a positive relationship between both gender diversity and accountability for sustainability and gender diversity and disclosure of diversity information as the presence of women at different levels of the organization generates positive expectations of quality, credibility, and transparency by reducing information asymmetry and by signaling legitimacy. In achieving its aim, our study provides both theoretical and practical contributions in order to give a research agenda useful to guide future research efforts, and also highlight how the implementation of gender equality and work-life balance policies can create a system of benefits for public entities
Blood Pressure and Lipid Profile in Hypertensive Patients Post the First COVID-19 Lockdown: “Brief Letter for Publication”
No full textGoing 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
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