1,721,057 research outputs found
A framework for trajectory data warehousing and visual OLAP analysis
Full text linkThis thesis is aimed at designing a formal framework for modelling a Trajectory Data Warehouse, namely a data warehouse able to store aggregate information related to trajectories of moving objects, which also offers visual OLAP operations for data analysis.
The TDW model includes both a temporal and a spatial dimensions, that ensure flexibility, making our model general enough to deal with objects that are either completely free or constrained in their movements. This dimensions and associated hierarchies reflect the structure of the objects and of the environment in which they travel.
Our framework also includes a visual interface for easily navigating aggregate measures obtained from OLAP queries at different granularities.
To highlight the usefulness of the framework, we propose two different case studies, differing for the type of the observed moving objects, the available information about the objects, and their movement constraints.Questo lavoro di tesi vuole definire un framework per un data warehouse di traiettorie, ovvero un data warehouse capace di contenere informazioni aggregate relative a traiettorie di oggetti, e che offra operazioni OLAP visuali per la loro analisi.
Il modello include sia una dimensione temporale che una spaziale, che ne assicurano flessibilità, rendendolo in grado di gestire sia oggetti che si muovono liberamente o seguendo dei vincoli. Queste dimensioni, e le gerarchie associate, riflettono la struttura degli oggetti stessi e dell’ambiente in cui si muovono.
Il framework proposto include anche una interfaccia visuale che permette di navigare in modo semplice tra le misure aggregate attraverso query OLAP a differenti granularità.
Per evidenziare l’utilità del sistema proposto, proporremo due casi di studio, che si differenziano per il tipo di oggetti studiati, le informazioni disponibili su di loro e al tipo di vincoli sui loro movimenti
Electrophysiological abnormalities in iatrogenic botulism: Two case reports and review of the literature
No full textTherapeutic use of botulinum neurotoxin type A (BoNT/A) is effective, and generally safe. Nevertheless, iatrogenic botulism (IB) is rarely reported as a result of systemic spread of the BoNT/A, causing general weakness, bulbar symptoms and dysautonomia. Suggestive clinical feature are decisive to raise the diagnostic suspicion, which however needs a confirmation in the electrodiagnostic (EDX) study, above all to exclude other treatable diseases. In this study, we report 2 patients who developed IB after receiving therapeutic doses of BoNT/A, assessing the EDX changes, and reviewing the literature on EDX in IB. Although there is not enough data to draw solid conclusions we propose that, in a subject with suggestive clinical features and recent exposure to BoNT/A, the absence of a decremental or incremental response to repetitive nerve stimulation in muscles showing acute denervation changes, is a suggestive finding for the diagnosis of IB
The Rice Supply Chain In France: Issues, Strategies And Future Developments
No full textThe European economic crisis is affecting even the agriculture and food sectors. In particular, the European rice-growing countries are facing an increasing situation of stress and problems due to the costs of rice production. In this context, the normative evolution related to CAP will be reducing help to agriculture, bringing European rice farmers to their knees, especially the small ones. This is a case study of the present situation in France, a country where, although rice production is marginal within the European context, the structure of the supply chain and the ability to promote rice as a product could give food for thought for a further comparison with Italy and Europe. The aim of this paper is to analyse the organization of the French supply chain as a whole and how this can have a positive impact on the promotion of the product "rice". The awareness of these dynamics allows us to start a comparison with the Italian rice supply chain, which needs deep changes in the light of the introduction of the new CAP regulations
Is There a Risk of Lymphoma Associated With Anti-tumor Necrosis Factor Drugs in Patients With Inflammatory Bowel Disease? A Systematic Review of Observational Studies
Full text linkBackground: Inflammatory bowel diseases (IBDs) are generally not considered a risk factor for the development of lymphoma. When considering IBD treatments, there is good evidence supporting thiopurines (azathioprine, 6-mercaptopurine) as a risk factor for lymphoma. Conversely, the association between the use of anti-TNF agents and the development of lymphoma remains undetermined. In this systematic review, we analyzed the evidence coming from observational studies supporting an association between the use of anti-TNF drugs and lymphoma in patients with IBDs. Methods: This systematic review was performed according with MOOSE and PRISMA statements. We searched observational studies conducted on IBD patients, using MEDLINE, EMBASE, and Google Scholar, published in English language, within the period ranging from January 1st, 1999 to June 30th, 2018. An assessment of the methodologic shortcomings of selected studies was performed as well. Results: Fourteen studies met the eligibility criteria and were included in the review. Only four studies found a significant association of anti-TNF drug with lymphoma or groups of cancers including lymphoma. However, the methodologic shortcomings of all the included studies made their results unreliable, irrespectively of whether their findings supported an association or not. Conclusions: Current evidence from observational studies does not allow excluding or confirming an association of the exposure to anti-TNF treatments with lymphoma in IBD patients
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
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