Search results for "multi-level"

Parallel Schwarz methods for convection-dominated semilinear diffusion problems

2002

AbstractParallel two-level Schwarz methods are proposed for the numerical solution of convection-diffusion problems, with the emphasis on convection-dominated problems. Two variants of the methodology are investigated. They differ from each other by the type of boundary conditions (Dirichlet- or Neumann-type) posed on a part of the second-level subdomain interfaces. Convergence properties of the two-level Schwarz methods are experimentally compared with those of a variant of the standard multi-domain Schwarz alternating method. Numerical experiments performed on a distributed memory multiprocessor computer illustrate parallel efficiency of the methods.

Comparison of parallel implementation of some multi-level Schwarz methods for singularly perturbed parabolic problems

1999

Abstract Parallel multi-level algorithms combining a time discretization and an overlapping domain decomposition technique are applied to the numerical solution of singularly perturbed parabolic problems. Two methods based on the Schwarz alternating procedure are considered: a two-level method with auxiliary “correcting” subproblems as well as a three-level method with auxiliary “predicting” and “correcting” subproblems. Moreover, modifications of the methods using time extrapolation on subdomain interfaces are investigated. The emphasis is given to the description of the algorithms as well as their computer realization on a distributed memory multiprocessor computer. Numerical experiments …

La lunga marcia verso la libertà sindacale del “comparto sicurezza”

2020

Il saggio analizza l’evoluzione dei diritti sindacali nel “comparto sicurezza” (forze armate e di polizia) all’insegna di una prospettiva multilivello: dopo una disamina delle fonti sovranazionali (convenzioni OIL, Cedu e Carta Sociale Europea) e del dettato costituzionale, la ricerca si sofferma sulla libertà sindacale di militari e poliziotti alla luce del quadro normativo e giurisprudenziale di riferimento. Nonostante dal finire degli anni ’70 l’ordinamento militare e quello della Polizia di Stato si siano progressivamente aperti ai diritti collettivi, permangono numerosi profili di criticità, come il regime di separatezza sindacale, il divieto di sciopero e la mancata emanazione di una …

Conceptualizing the European multilevel administrative order: capturing variation in the European administrative system

2015

Acknowledging that both analysts and practitioners face problems of meaningful categorization of social order in general, and the European political-administrative system in particular, this article suggests a conceptual frame through which European administrative order may be understood. Providing such a frame is important, because the catalogue of categories of the European Union (EU) polity developed so far fails to acknowledge its administrative dimension. Given that the ongoing political transformation in the EU implies ever more administrative interaction between political levels in order to coordinate, manage and implement policies, this administrative dimension becomes ever more imp…

Contextualizing AMO explanations of knowledge sharing in MNEs: the role of organizational and national culture

2022

AbstractAbility, motivation, and opportunity (AMO) approaches have dominated studies of knowledge sharing in multinational enterprises (MNEs). We argue that there is a need to consider both the national and organizational cultural contexts. Beyond their direct influence on knowledge sharing with colleagues in other business units (BUs), national and organizational culture significantly reinforce the positive relation between individual motivation and knowledge sharing. Thus, our multi-level approach to knowledge sharing in MNEs gives rise to a contextualized AMO approach that provides a novel and more potent understanding of variations in knowledge sharing. At the individual level, our appr…

A Mobile Diary Method for Studying Children’s and Adolescents’ Emotions : A Pilot Study

2015

Researching children’s and adolescents’ emotions from their own perspectives possesses special requirements for the data collection tools used. In this study, children’s and early adolescents’ emotions were investigated using a mobile diary method. The article describes and evaluates this data collection method and presents empirical results on fluctuation in the emotions of children and adolescents (n = 60, aged 7–14 years). The data, in the form of short text messages, were collected over one week. Every evening, children received seven questions on their emotions. Multilevel modeling was used to analyze the data. The results illustrate the potential of the mobile diary method with childr…

Does taking additional Maths classes in high school affect academic outcomes?

2023

Several studies in the mathematical education literature show the effect of students’ high school skills in maths on their success at higher levels of education and work. In particular, the importance of maths course taking in US high schools is highlighted to be important for college enrolment and completion. The choice of taking additional maths courses or, as in Italy, of choosing a high-school curriculum with more maths, is not random: it depends on several substantial factors such as gender and socio-economic status. This selection bias implies that the differences in the academic outcomes might be traceable not only to mathematics ability and knowledge. In this paper, the aim is to es…

Social Competence and Moderate to Vigorous Physical Activity of School-Aged Children through a Creative Physical Education Intervention

2019

Traditional school physical education focuses on physical skills or strategies with an expectation that learning these skills lead to healthier lifestyle outside physical education classes, while children’s overall moderate to vigorous physical activity (MVPA) is widely decreasing. Creative Physical Education (CPE) understands physical education more holistically, as the central pedagogical element of movement is social learning. The current study examined the development of social competence in school physical education (PE) and total moderate to vigorous physical activity (MVPA) participation through a CPE-based intervention. Participants were 363 (177 intervention, 186 control) children …

I lineamenti della nuova politica industriale tra territori e istituzioni

2008

Multilevel Governance for Climate Change Adaptation in Food Supply Chains

2019

The vulnerability of food supply chains to climate change is higher compared to other industries due to its dependency on climatic conditions, temperature and water supply. As a robust response to the vulnerability of food supply chains, it is essential to find ways of linking the concepts of sustainable development, climate change adaptation and risk governance into one paradigm. The risk governance of food supply chains is conducted by and across both private and public spheres. Hence, in this chapter, we introduce a dual system of governance to match the objectives of climate change adaptation, and discuss the multiplicity and potential integration of both corporate-led private governanc…