1,721,042 research outputs found
The realizability problem as a special case of the infinite-dimensional truncated moment problem
Full text linkThe realizability problem is a well-known problem in the analysis of complex systems, which can be modeled as an infinite-dimensional moment problem. More precisely, as a truncated K-moment problem where K is the space of all possible configurations of the components of the considered system. The power of this reformulation has been already exploited by Kuna, Lebowitz, and Speer [Ann. Appl. Probab. 21 (2011), pp. 1253-1281], where necessary and sufficient conditions of Haviland type have been obtained for several instances of the realizability problem. In this article we exploit this same reformulation to apply to the realizability problem the recent advances obtained by Curto, Ghasemi, Infusino, and Kuhlmann [J. Operator Theory 90 (2023), pp. 223-261] for the truncated moment problem for linear functionals on general unital commutative algebras. This provides alternative proofs and sometimes extensions of several results of Kuna, Lebowitz, and Speer [Ann. Appl. Probab. 21 (2011), pp. 1253-1281], allowing to finally embed them in the above-mentioned unified framework for the infinite-dimensional truncated moment problem
A multicriteria decision aid perspective that guides an incremental development of knowledge and fosters relationships and decisions
Full text link“Ivrea, industrial city of the 20th century”, is the 54th UNESCO site in Italy, and it has been in the World Heritage List since July 2018. Its inclusion was the result of a complex decision process, which needs to be reactivated to enhance this large, unitary urban system of great historical, architectural and environmental value. The huge dimensions and extreme heterogeneity of the built heritage, the weakness of the socio-economic context, and the dynamics of the public and private organisations have generated a complex situation, which hinders the enhancement of the whole UNESCO site. A methodology that integrates two decision aid approaches can deal with and reduce these complexity factors, to guide the incremental development of knowledge and to foster relationships that facilitate the process reactivation. A Problem Structuring method was used to structure the decision problems and logically synthesise fragmented knowledge. Multicriteria models and methods were used to analytically describe the space of action and propose examples of how alternative policies, enhancement activities or projects can be analysed and evaluated, to be ranked or selected. The paper describes the problem situation and how these methods were integrated and used. The study aims to underline the complementarity of the different decision aid approaches and to show how logical and analytical models, applications of tools and results can be proposed to create an effective communication process, both at technical level and with stakeholders who are willing to participate in preparatory workshops
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
La costruzione di un territorio per il tempo libero. Esperienze d'oltralpe a confronto
No full textIl presente contributo desidera offrire spunti di riflessione sugli strumenti che la ricerca in architettura può adoperare nello studio del territorio alpino. Il lavoro è parte di una tesi di dottorato in architettura attualmente in corso intitolata La construction d’un territoire pour le tourisme de masse. Le cas des Alpes franco-italiennes dans l’après – Seconde Guerre mondiale. La ricerca indaga, con una prospettiva transfrontaliera, la costruzione di sistemi di infrastrutture per il turismo di massa nei siti montani d’alta quota. Ci interessiamo in particolare al periodo 1960-1975, che ha visto l’affermazione e la crisi di un modello di pianificazione chiamato in Francia station intégrée. Inizialmente, ripercorreremo le principali idee che hanno animato l’interesse per lo studio dell’architettura di montagna negli ultimi anni. In seguito, verranno proposte nuove possibilità di lettura, alla luce delle problematiche attuali delle regioni alpine d’alta quota
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