86,776 research outputs found
MDCgo takes up the association/correlation challenge for grouped ordinal data
No full textThe subjective assessment of quality of life, personal skills and the agreement with a certain opinion are common issues in clinical, social, behavioral and marketing research. A wide set of surveys providing ordinal data arises. Beside such variables, other common surveys generate responses on a continuous scale, where the variable actual point value cannot be observed since data belong to certain groups. This paper introduces a re-formalization of the recent “Monotonic Dependence Coefficient” (MDC) suitable to all frameworks in which, given two variables, the independent variable is expressed in ordinal categories and the dependent variable is grouped. We denote this novel coefficient with MDCgo. The MDCgo behavior and the scenarios in which it presents better performance with respect to the alternative correlation/association measures, such as Spearman’s r rS, Kendall’s τb and Somers’ Δ coefficients, are explored through a Monte Carlo simulation study. Finally, to shed light on the usefulness of the proposal in real surveys, an application to drug-expenditure data is considered
Latest frontiers in grouped-ordinal data dependence analysis
No full textThe bivariate dependence analysis is strongly supported in literature by a wide set of measures, including the Pearson’s r, the Kendall’s τb and the Spearman’s rS correlation coefficients among others. Currently, we are assisting to an explosion in the availability of ordinal data due to widespread attitudinal surveys. In many cases, survey scales are also built on responses that are observed to belong to certain groups on a continuous scale (grouped variable). Given h groups, the measurement problem may be addressed by encoding each group through a label (from 1 to h) and, subsequently, by assigning rank one to all the units included in the first ordered group and finally rank h to those included in the h-th ordered group. In such a way, the assessment of the direct or inverse dependence relationship may be carried out through Spearman’s rS (e.g. Spearman[3]) or Kendall’s τb (e.g. Kendall[2]) coefficients which are based on the correlation between the ranks of two variables and on the pairs of concordant and discordant values of two variables, respectively. This results in neglecting the original continuous nature of the grouped variable, since the information from the grouped variable has to be reduced to its ordinal information, too. A crucial issue is then related to dependence relationship studies when one variable is ordinal and the other variable is grouped. The “Monotonic Dependence Coefficient” (MDC), recently proposed by Ferrari and Raffinetti[1], is here re-formalized for the case of grouped and ordinal variables. Through a Monte Carlo simulation study, some basic hints about the new MDC coefficient performance in specific scenarios are given even in comparison with Spearman’s and Kendall’s coefficients. The contribution ends with an application to drug-expenditure data incurred by the Italian system for public health assistance, whose aim is to illustrate the role of age differences in the allocation of drug expenditure both by considering overall patients and single sub-groups, differing in terms of gender
Towards reconstructing rural landscapes: A case study of Italian Mongardino
No full textThis paper intends to propose an integrated methodology for reconstructing the rural landscape of Mongardino, a municipality in the cross-border area of the UNESCO Buffer Zone of the ‘Vineyard Landscape of Piedmont: Langhe-Roero and Monferrato’. A multi-source approach was established to detect land use changes that occurred in its dynamic agricultural mosaic from the 17th century to date and intuiting future land-use variations. Qualitative comparisons have combined literature, historical maps from archives, repeated photo- and postcard-based research, statistical dataset interpretations and WebGIS surveys. This research has delineated the significance of historical studies to detect and interpret current matrices of change and build an enhanced comprehension of the evolutionary trajectories of a wine-growing landscape over time. Findings reveal that changes do not follow administrative boundaries but rather linear, non-linear, external and internal dynamics that are local and context-dependent. On the one hand, no asymmetries or prevailing trends have been found between the areas encompassed or not in the UNESCO Buffer Zone. On the other hand, land-use and historical permanencies are detected as indicators of integrity and qualifying landscape elements upon which to build rural strategies and policies for local-based landscape planning and management
Study and results of an onboard brake monitoring system for freight wagons
No full textThis paper presents the background study, the development and the tests of a monitoring system for intermodal freight wagon. The prototype of the on-board unit, developed by the research group of Railway Engineering of Politecnico di Torino, was installed and tested on an intermodal freight wagon owned by the company Ambrogio Trasporti S.p.a. as part of the project ITS Cluster Italy 2020. Significant advances have been made in the field of freight train monitoring. In recent years, many companies have presented specific devices with the aim of monitoring the operating conditions of goods wagons. The developed prototype was tested on real track. The main vehicle parameters monitored during the tests were the temperature of brake blocks, the operating pressures of the brake system, and the vehicle accelerations. The measurements allowed the team to verify the effectiveness and reliability of the monitoring system in harsh conditions. The significant amount of measured data were then used to validate a first energetic model useful for subsequently developing monitoring and diagnostic algorithms
Guido delle Colonne. Histoire de la destruction de Troye la grant .
No full textAimar de Poitiers. Manuscrit(s) lui ayant appartenuColombe, François. Manuscrit(s) enluminéDestruction de Troye ( La )Diane de Poitiers. Manuscrit(s) portant son ex-librisGuido delle Colonne. Histoire de la destruction de TroyeHachette, André. Manuscrit(s) provenant de luiContient : Cy commence la vraye histoire au long de la destruction de Troye la grantNumérisation effectuée à partir d'un document original.Remaniement par Guido delle Colonne du Roman de Troie de Benoit de Sainte-More. Exemplaire exécuté vers 1500 pour Aimar de Poitiers dont il porte les armes (1v). Dix-sept grandes peintures à pleine page (dont deux inachevées et une esquissée) et soixante-cinq petites peintures (dont une inachevée et six esquissées), exécutées dans l'atelier des Colombe : au f. 11, le nom de François Colombe apparaît en clair dans une des petites peintures. Initiales rouges et bleues sur fond d'or, ornées parfois d'un personnage. Rubriques, bouts-de-ligne. Réclames. Il manque deux f. conservés aujourd'hui au Kupferstichkabinett de Berlin. Ce manuscrit a fait partie des collections d'Aimar de Poitiers ; -- de Diane de Poitiers, dont l'ex-libris figure au f. 1 : « Ce lyvre est a moy. Faict a Ennet [Anet], ce. IX. de may 1566 » ; -- du chancelier Séguier ; -- de Coislin ; -- de Saint-Germain-des-Prés ; -- de Pierre Dubrowski ; -- du Musée de l'Ermitage à Saint-Pétersbourg ; -- d'André Hachette. Cf. Catalogue de la vente A. Hachette , n° 14 (16 décembre 1953) ; J. Porcher, dans Les Trésors des bibliothèques de France , t. XXVI, p. 84 ; M. Thomas, dans The Connoisseur , août 1954
Kinetic study of the stereoselectivity reduction of acetophenone promoted by a strain of Geotrichum spp
No full textFil: Decarlini, M. F. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Vázquez, A. M. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Aimar, M. L. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química. Cátedra de Química Aplicada; Argentina.Nowadays, biocatalytic stereoselective reduction of prochiral ketones is one of the
most important methodologies in organic synthesis for the preparation of chiral
alcohols. These enantiomerically pure alcohols are very important because they
are key precursors in the obtaining of pharmaceutical compounds. Recently, a
screening on fifty six strains of bacteria and fungi was made for our team toidentify
microorganisms capable of performing the stereoselective reduction of
acetophenone (AP) to 1-phenylethanol (1-PE). From this study a strain of
Geotrichum spp.has been isolated and characterized, and this yeast has presented
anexcellent conversion (>99%) and stereoselectivity (>99.9 e.e.%) in the
preparation of (R)-1-PE from AP.Fil: Decarlini, M. F. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Vázquez, A. M. Universidad Católica de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Aimar, M. L. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Química. Cátedra de Química Aplicada; Argentina.Otras Ciencias Química
The Fifth Landscape: Art in the Contemporary Landscape
No full textAt the Shaping the City conference organised by the European Cultural Center at the 2018 Venice Biennale, the concept of the Fifth Landscape (or Landscape 5.0) was exhibited for the first time. Thanks to creativity, the goal is to experiment with spaces for the sake of social and cultural imagination, in which it is no longer just a question of architecture but of dreams and social imagination. “Ideal” spaces are related to their impact on the architecture, art and human hopes. In the Fifth Landscape, the contemporary prefers the moment of the artistic gesture that will be remembered but that is not relived in everyday life. Temporary installations in urban centers and open spaces become an occasion for new uses of the different environments, such as living them in a completely new way with novel prospects for the future. If the First Landscape is the managed forest, then the Second is the cultivated field. The Third is the abandonment of places at the hands of man, according to Gilles Clément, and the Fourth is where art is used to counter urban degradation and solitude. The Fifth Landscape is generated by temporary works that, catalysing territorial force, stimulate people to live in the environment in a new way, making it dreamlike. The strong emotional impact on the collective memory transmits, in addition to the true meaning of the work, a sense of uniqueness of the moment that one is experiencing. New visions of landscapes are provided to the community, in which art, architecture, design and nature are confronted using environmental sustainability and the landscape itself as themes. What influences will cultural dematerialisation have on the landscape? How will the sense of beauty in the future society be transmitted and realised? If it is, through which artistic and ephemeral gestures will it appear? Helped by virtuous and suggestive artworks among which Vesuvius by Diego Repetto, Illusion by Alberto Timossi and ARTgo by Diego Repetto, we try to answer the proposed questions, thus understanding more about the potential future perception of the landscape in a continuous search for beauty
On generalized divergence and Laplace operators as a matter of division of distributions
No full textMotivated by the approach to the Laplacian on undirected weighted graphs, we provide a setting for a general point of view for a Kirchhoff type divergence and a Laplace operator built on the trivial gradient f(y)−f(x) of order zero. We consider some particular classical and new instances of this approach and we introduce a notion of derivative as a tool for approximation of these operators.Fil: Aimar, Hugo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Gomez, Ivana Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; Argentin
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