1,721,011 research outputs found
A topological interpretation of three Leibnizian principles within the functional extensions
No full textThree philosophical principles are often quoted in connection with Leibniz:
"objects sharing the same properties are the same object" (Identity of
indiscernibles), "everything can possibly exist, unless it yields
contradiction" (Possibility as consistency), and "the ideal elements correctly
determine the real things" (Transfer). Here we give a precise
logico-mathematical formulation of these principles within the framework of the
Functional Extensions, mathematical structures that generalize at once
compactifications, completions, and elementary extensions of models. In this
context, the above Leibnizian principles appear as topological or algebraic
properties, namely: a property of separation, a property of compactness, and a
property of directeness, respectively. Abiding by this interpretation, we
obtain the somehow surprising conclusion that these Leibnizian principles may
be fulfilled in pairs, but not all three together
L0-penalized membership in sparse fuzzy clustering
No full textThe literature encompasses various approaches to address
sparsity in the context of cluster analysis, often by adding regularization terms to weight the role of variables in clustering processes. In the work presented here, instead, an L0-regularization term is employed on fuzzy membership degrees to enhance the standard Fuzzy K-Means algorithm. The new algorithm helps to assign units very close to the corresponding prototype with a membership degree equal to 1 without necessarily compromising the potential ambiguity in the membership of some units
La sicurezza sul lavoro in Italia. Un'analisi esplorativa
No full textNell’ultimo decennio, il tema della sicurezza sui luoghi di lavoro è stato oggetto di particolari attenzioni sia a livello accademico che istituzionale. Negli ultimi anni, poi, il Covid-19 ha contribuito a far tornare il tema della sicurezza sul lavoro ai vertici dell’agenda politica e del dibattito accademico-istituzionale, facendo emergere la necessità di programmare misure addizionali rispetto a quelle già adottate. A partire da tali premesse, obiettivo del presente lavoro è quello di identificare le eterogeneità che caratterizzano il tessuto socioeconomico e le eventuali concentrazioni del fenomeno infortunistico (e delle relative compensazioni) in particolari territori e settori di attività economica, anche tenendo conto del divario di genere, al fine di poter contribuire al disegno e alla valutazione di politiche (settoriali e place-based) dedicate ad incrementare la sicurezza sui luoghi di lavoro. Tale obiettivo è perseguito mediante l’elaborazione di una descrizione del fenomeno infortunistico e della sua articolazione territoriale e settoriale. L’esplorazione dei dati mette in luce l’esistenza di numerosi aspetti che meriterebbero ulteriori analisi sia di natura statistico-inferenziale che di natura econometrica. A partire dai risultati dell’analisi statistica, si espongono brevemente i
principali elementi che potrebbero ispirare ulteriori ricerche sul tema della sicurezza nei luoghi di lavoro in Italia e sugli argomenti ad esso connessi
Valutazione d’impatto della politica ISI-INAIL sulla sopravvivenza delle imprese
No full textNel contesto della SSL, la comprensione della prospettiva economica è particolarmente rilevante: dal punto di vista dei decisori politici, le condizioni di lavoro non sicure o non sane comportano esternalità negative relativamente ai costi che i lavoratori
e le imprese sostengono. In questo contesto, è stato valutato l'effetto del Bando ISI 2013, esclusivamente sui progetti di investimento finalizzati all’acquisto di macchinari più sicuri e/o di sostituzione macchine (in servizio antecedentemente al 1996), negli effetti indiretti generati dalla politica in termini di sopravvivenza delle imprese
Modelli a mistura finita per la valutazione delle politiche pubbliche: studio sui Bandi ISI-INAIL
No full textL’approccio seguito è orientato alla stima dei parametri della mistura di processi di Poisson per la determinazione del tasso infortunistico. Tale definizione del parametro è volta alla valutazione della politica di incentivazione ISI implementata nel 2013
La strategia di identificazione dell’impatto indaga ulteriormente il legame tra un set di variabili esplicative e la probabilità infortunistica di ogni azienda
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
- …
