169 research outputs found
Analisi statistica di dati provenienti da contesti ambientali III
No full textIl presente rapporto tecnico è stato realizzato nell’ambito del progetto PON “Ricerca e Innovazione” 2014-2020, con tematica Green (Azione IV.5 e Azione IV.6), ed inoltre all'interno di un elaborato di tesi di Laurea Magistrale in Matematica. L'attività si sviluppa in collaborazione con l’azienda Tekra s.r.l., specializzata nell’ambito della raccolta dei rifiuti, con sedi dislocate sul territorio nazionale. Esso consiste in un resoconto circa lo studio delle spese sostenute nell’anno solare 2022 dall'azienda, riguardo la manutenzione ordinaria e straordinaria degli automezzi operativi. L’indagine statistica descrittiva ha seguito l'impostazione dei precedenti due report, rispettivamente dal titolo “Analisi statistica di dati provenienti da contesti ambientali I”, con autori il Dott. Marco Capaldo e la Dott.ssa Serena Spina, ed “Analisi statistica di dati provenienti da contesti ambientali II”, con autori il Dott. Marco Capaldo, la Dott.ssa Giulia Pisano e la Dott.ssa Serena Spina
Analisi statistica di dati provenienti da contesti ambientali II
No full textIl presente rapporto tecnico è stato realizzato nell’ambito del progetto PON “Ricerca e Innovazione” 2014-2020, con tematica Green (Azione IV.5 e Azione IV.6), ed inoltre nell’ambito del tirocinio curriculare previsto nel percorso di Laurea Magistrale in Matematica. L’attività si sviluppa in collaborazione con l’azienda Tekra s.r.l., specializzata nell’ambito della raccolta dei rifiuti, con sedi dislocate sul territorio nazionale. Esso consiste in un resoconto circa lo studio delle spese
sostenute nell’anno solare 2020 dall’azienda, riguardo la manutenzione ordinaria e straordinaria degli automezzi operativi. L’indagine statistica descrittiva ha seguito l’impostazione del precedente report dal titolo “Analisi statistica di dati provenienti da contesti ambientali I”, con autori il Dott. Marco Capaldo e la Dott.ssa Serena Spina
Analisi statistica di dati provenienti da contesti ambientali I
No full textIl presente report consiste in un resoconto dell'attività svolta nell’anno solare 2022 nell’ambito del progetto PON “Ricerca e Innovazione” 2014-2020, con tematica Green (Azione IV.5 e Azione IV.6). Il rapporto tecnico è stato sviluppato in collaborazione con l’azienda TEKRA s.r.l., specializzata nell’ambito della raccolta dei rifiuti, con sedi dislocate sul territorio nazionale. L’indagine statistica descrittiva riguarda le spese sostenute dall’azienda nel 2021 per la manutenzione ordinaria e straordinaria degli automezzi operativi, adibiti al raccoglimento dei rifiuti differenziati, pulizia delle strade e trasporto nei siti di smaltimento
Generalized Gini's mean difference through distortions and copulas, and related minimizing problems
No full textGiven a random variable and considered a family of its possible distortions, we define two new measures of distance between and each its distortion. For these distance measures, which are extensions of the Gini's mean difference, conditions are determined for the existence of a minimum, or a maximum, within specific families of distortions, generalizing some results presented in the recent literature
Cumulative information generating function and generalized Gini functions
No full textWe introduce and study the cumulative information generating function, which
provides a unifying mathematical tool suitable to deal with classical and fractional
entropies based on the cumulative distribution function and on the survival function.
Specifically, after establishing its main properties and some bounds, we show that
it is a variability measure itself that extends the Gini mean semi-difference.
We also provide (i) an extension of such a measure, based on distortion functions,
and (ii) a weighted version based on a mixture distribution.
Furthermore, we explore some connections with the reliability of -out-of-
systems and with stress-strength models for multi-component systems.
Also, we address the problem of extending the cumulative information
generating function to higher dimensions
Mean distances and dependence structures for lifetimes of systems with shared components
No full textDistortion and copula functions represent powerful tools in the description of the reliability of some complex systems as functions of their components' reliability. On this aim we study several pairs of reliability systems with one or more shared components, in the case when their lifetimes are independent and identically distributed or independent but not identically distributed. We focus on the dependence that arises from sharing components, often described by Marshall-Olkin copulas, making use of some distance measures related to the Gini's mean difference and its new recent generalizations. A special role is played by a new distortion function related to the ROC curve
Generalized equilibrium distributions
No full textWe define the generalized equilibrium distribution, that is the equilibrium distribution of a random variable with support in . This concept allows us to prove a new probabilistic generalization of the Taylor's theorem. Then, the generalized equilibrium distribution of two ordered random variables is considered and a probabilistic analogue of the mean value theorem is proved. Results regarding distortion-based models and mean-median-mode relations are illustrated as well. Conditions for the unimodality of such distributions are obtained. We show that various stochastic orders and aging classes are preserved through the proposed equilibrium transformations. Further applications are provided in actuarial science, aiming to employ the new unimodal equilibrium distributions for some risks measures, such as Value-at-Risk and Conditional Tail Expectation
Due anomalie degli studi di Riccardo Picchio sullo Slovo o polku Igoreve
No full textviene messa in discussione la tesi che nello Slovo o polku Igoreve ci siano all'inizio due chiavi tematiche biblicheThe author criticizes Picchio's opinion that there is a biblical thematic clue at the beginning of Slovo o polku igorev
Supervisor/peer involvement in evaluation Transfer of Training process and results reliability: A research in an Italian Public Body
No full textPurpose: The aim of this paper is to present a study performed in conjunction with a branch of the Italian Public Italian Administration, the ISSP (Istituto Superiore di Studi Penitenziari – the Higher Institute of Penitentiary Studies). The study aimed to develop a Transfer of Training (ToT) evaluation methodology that would be both scientifically robust and practitioner-friendly, in an attempt to build a bridge between researchers and practitioners on the topic of ToT process evaluation. Design/methodology/approach: The ToT evaluation system was built using an action research approach, taking into account workplace specifics and stakeholder needs. An “action research” (with the researchers involved throughout the ToT system building phases) and a “Focus Group” (to identify factors influencing ToT and to define items and grids for behavioural assessment) were used. Findings: This study showed that the active engagement of stakeholders (trainees and their supervisors and colleagues) is useful in designing context-adapted tools for ToT evaluation and can help organizations improve the fit between their training activities and organizational goals. Research limitations/implications: The generalizability of the proposed ToT evaluation methodology is not guaranteed, and the procedure needs to be replicated and monitored in different organizational settings and cultures. Practical implications: The organization decided to implement the ToT evaluation methodology developed during the course of the study for all future training programmes. Originality/value: In this study, a ToT evaluation methodology was built that will be both scientifically robust and practitioner-friendl
Simultaneous Optimization of Real-Time Control Strategies and Powertrain Design for Fuel Cell Hybrid Vehicles
No full textThe successful introduction of low-carbon footprint and highly efficient fuel cell vehicles represents nowadays a key action to achieve sustainable mobility worldwide. The main technological barriers (i.e., market price, lifetime and performance) to be overcome justifies an increasing attention towards the development of mathematical tools featuring co-optimization capabilities, so as to adequately account for the strong interactions and mutual influence between design criteria and selected control strategies. This paper thus presents and discusses the integration of a comprehensive model of a generic FCHV architecture with a specifications independent control strategy within a modular constrained optimization algorithm, the latter conceived in such a way to simultaneously find the optimal FCHV powertrain design and real-time applicable control strategies. Suitable design and energy management criteria, accounting for also the impact of driving mission on proper management of available power sources, were selected. The proposed co-optimization procedure aims at determining the main powertrain design parameters (i.e., nominal fuel cell system power and battery pack energy density), as well as some key driving cycle-related information (i.e., power prediction time horizon), so as to enable effective adaptation of the specifications independent control strategy to the current design. The latter aspect is particularly contributing as it allows accounting for the impact of most frequent driving path on vehicle optimization, as well as ensuring proper cycle dependent energy management be performed in each driving mission. When applying the methodology to a specific driving cycle, it was possible demonstrating that the selected optimization variables allow exploiting to the maximum extent the known positive characteristics of fuel cell technology in conjunction with driving cycle features. Moreover, optimization outcomes indicate that range-extender designs, with degree of hybridization as high as 0.8, shall be preferred to maximize the benefits associated to easy-to-apply rule-based control strategies developed for efficient FCHV powertrain destined to a wide range of end-users
- …
