1,725,063 research outputs found
3rd Special issue on matrix computations and statistics
No full textPreface to special issue "Matrix Computations and Statistics" edited by the J. Barlow, L. Elden and P. Foschi of the journal Computational Statistics and Data Analysi
Renato Foschi (Università La Sapienza, Roma), La rappresentazione “scientifica” della personalità delle popolazioni del sud d’Italia fra Ottocento e Novecento. Relazione al Convegno SCIENZA, INNOVAZIONE, ISTITUZIONI organizzato dalla Società Italiana di Storia della Scienza.
No full textOptimal trial duration times for multiple change points products lifetime distributions
No full textAn interesting problem in reliability is to determine the optimal burn-in time. In Foschi and Spizzichino (Decis Anal 9:103-118, 2012), the solution of such a problem under a particular cost structure has been studied. It has been shown there that a key role in the problem is played by a function ρ, representing the reward coming from the use of a component in the field. A relevant case in this investigation is the one when ρ is linear. In view of more general applications to management of production processes, in this paper, we explore further the linear case and use its solutions as a benchmark for determining the locally optimal times when the function ρ is not linear or when the components lifetimes distribution is not bathtub (or upside down bathtub) shaped
Interactions between ageing and risk properties in the analysis of burn-in problems
No full textSeveral relevant problems in reliability can be looked at as problems of risk management and of decisions in the face of uncertainty. However, in this frame, the so-called burn-in problem can be seen as a problem of risk taking par excellence. In this paper, we in particular point out some aspects concerning interactions between the probabilistic model for lifetimes and considerations of an economic kind. As one of the features of our work, we hinge on some unexplored connections between ageing properties of a one-dimensional survival function Formula and risk-aversion-type properties of the function u(t) = bG(t), b > 0, when the latter is seen as a utility function
Evolution of the Dependence of Residual Lifetimes
No full textWe investigate the dependence properties of a vector of residual lifetimes by means of the copula associated with the conditional distribution function. In particular, the evolution of positive dependence properties (like quadrant dependence and total positivity) are analyzed and expressions for the evolution of measures of association are given
Il monastero di S. Cristina della Fondazza
No full textRaccolta di contributi che costituiscono l'edizione di scavo, con i relativi approfondimenti storico-archeologici, di un settore territoriale ubicato nel suburbio orientale di Bologna, entro cui si colloca anche un importante complesso monastico. La documentazione pubblicata copre un arco cronologico compreso tra la prima età del Ferro, il periodo romano e il tardo medioevo
Hyper-dependence, hyper-ageing properties and analogies between them: a semigroup-based approach
No full textIn previous papers, evolution of dependence and ageing, for vectors of non-negative random variables, have been separately considered. Some analogies between the two evolutions emerge however in those studies. In the present paper, we propose a unified approach, based on semigroup arguments, explaining the origin of such analogies and relations among properties of stochastic dependence and ageing
Aging functions and multivariate notions of NBU and IFR
No full textFor d≥2, let X=(X1, …, Xd) be a vector of exchangeable continuous lifetimes with joint survival function . For such models, we study some properties of multivariate aging of that are described by means of the multivariate aging function , which is a useful tool for describing the level curves of . Specifically, the attention is devoted to notions that generalize the univariate concepts of New Better than Used and Increasing Failure Rate. These multivariate notions are satisfied by random vectors whose components are conditionally independent and identically distributed having univariate conditional survival function that is New Better than Used (respectively, Increasing Failure Rate). Furthermore, they also have an interpretation in terms of comparisons among conditional survival functions of residual lifetimes, given a same history of observed survivals
Maria Montessori (traduzione spagnola e nuova edizione per Spagna e America latina del volume in italiano del 2012 per Ediesse)
No full textEn las primeras décadas del siglo XX, la italiana Maria Montessori se convirtió internacionalmente en el icono de una nueva pedagogía que propone una educación progresista «a la medida de los niños». Pero, a pesar de la importancia del personaje, existen relativamente pocas biografías intelectuales dedicadas a ella, y menos aún que no sean de corte hagiográfico.
Renato Foschi aborda en este libro un análisis crítico, con referencias a fuentes publicadas y no publicadas, para insertar la biografía de Montessori dentro de las culturas en las que trabajó, al tiempo que analiza los fundamentos de su pedagogía en relación con la evidencia teórica y científica que aportan las últimas investigaciones sobre esta «pedagogía de la libertad».
Esta obra resalta la novedad del método Montessori a la luz de las ciencias humanas y sociales contemporáneas, poniendo el énfasis en la relevancia que ciertas posiciones científicas pueden desempeñar en el desarrollo de la sociedad civil cuando se entrelazan con la historia de las instituciones políticas y la organización del Estado social. Aquí se encuentran, en fin, nuevas claves de lectura para comprender la obra de Maria Montessori y la relevancia de su método pedagógico
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