1,721,238 research outputs found
Modeling Directed Local Search Strategies on Technology
Get PDFNK Model, Technology Landscape, Depth and Breadth of Search, Simulation Analysis
Alla ricerca del Santo Graal (e come vivere senza)
No full textL’accademia italiana sembra impegnata in una corsa alla ricerca del Santo Graal dell’Indicatore Perfetto di Qualità (IPQ) per valutare la ricerca scientifica. Man mano che i Cavalieri si addentrano in terre sconosciute ed ostili, si annuncia la scoperta di indicatori sempre più vicini all’IPQ: il numero di pubblicazioni, le loro citazioni, la VQR individuale, l’Impact Factor, la peer review, e decine di altri indicatori Meglio un approssimato (o approssimativo) Graal che non averne nessuno! Come si può vivere senza la certezza che il giusto sarà distinto dal peccatore, l’inattivo dall’eccellente? Il consenso raccolto dalla necessità di valutare la ricerca è talmente plebiscitario da meritare un po’ di sano scetticismo illuminista. Che la valutazione della ricerca sia, o rischi di divenire, una leggenda priva di fondamento
The analysis of taxpayers behaviour and the shadow economy: theoretical approach and empirical evidence for European countries
Get PDFIn the last decades, the consequences of tax evasion and shadow economy have been evident, indeed the wealth is hidden in the black market and it is translated into missed revenues for central government. Sometimes, the new type of approach is necessary to understand different phenomena and the reduction to single equation or formula is not sufficient to describe a single behaviour, of both consumer and producer.
As the recent Nobel Prize taught, to achieve a satisfying analysis, we need to approach to new experimental method, based on the expectations of audit and on the interactions among agents, analysed through pure simulations. Taking at the same time two dierent views and combining them, we should offer a new possibility of interaction among quantitative and qualitative methods, underlying the importance of both in a complete and exhaustive analysis.
This work, through some different chapters, attempts to debate the tax evasion and the underground economy in a wide perspective and from different points of view. The second chapter, regards a collection of surveys of both tax evasion and shadow economy, gathering dierent models, aspects and solutions to these problems. In this part we analyse the problem of tax evasion and the shadow economy through different methodological approach. Secondly, we focus on Agent-based Model we are going to use in the following part, looking deepen to interactions among agents and creation of network and inuences among them. Subsequently, analysing MIMIC model we will see the pros and cons of this model and how it investigates the problem of shadow economy in European countries. One of the most important problem about this topic is missing data because of underground economy's intrinsic nature is unobservable and we need
some approximations to evaluate it. The third part concerns the Agent-based Model and its application with dierent instruments. From one hand, we use an analytical model derived from Hokamp and Pickhardt (2010), whereas from another hand we use a qualitative
model developed by Lsd program of Valente (2008) to analyse the same problem from different points of view and capturing different aspects.
The fourth chapter analyses the problem of shadow economy using a MIMIC Model developed by Dell'Anno (2007), compared to the Schneider (2015) estimation and evaluating the different results between two types of modelling
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
Advanced numerical insight into the structural damage of masonry vaults under seismic excitation: two valuable case studies
No full textHistorical buildings are essential expressions of the artistic and cultural heritage of a country and thus, their preservation becomes of primary importance, especially in regions frequently affected by seismic events.
Most recent earthquakes have once again demonstrated the high seismic vulnerability of monumental masonry buildings and, specifically, critical issues associated with complex structural elements like vaults. In this framework, the main purpose of this paper is the analysis of how quadripartite vaults behave under horizontal loads and what their role is in the global seismic behaviour of historical constructions.
As a matter of fact, the study of vaults subjected just to gravitational loads is very difficult by itself. Consequently, it is by far harder to define how they behave with respect to lateral forces and, secondly, how they influence the global response of a structural system.
The analysis of the effects of vaults is afterward dealt with by referring to two different case studies: the Narthex of the Nativity Church in Palestine, one of the most ancient examples of basilica structures listed as a world heritage site by UNESCO and Torre Fornasini, a squat defensive tower near Poggio Renatico, N-E Italy and severely damaged by the recent 2012 Emilia Romagna (Italy) seismic event.
By means of the software ABAQUS, a proper finite elements model is implemented in order to assess the global structural behaviour of the structures, evaluating the seismic behaviour directly thorough non-linear dynamic analyses, discussing the obtained crack patterns, with particular attention to the vaulted systems. For all masonry structural members, a Concrete Damage Plasticity (CDP) constitutive model is used to properly account for damage phenomena and softening occurring on masonry during an earthquake
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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