100 research outputs found
From gridmap-file to VOMS: managing Authorization in a Grid environment
No full textFrom gridmap-file to VOMS: managing authorization in a Grid environment R. Alfieri, R. Cecchini, V. Ciaschini, L. dell’Agnellod, A. Frohner, K. Lorentey, F. Spataro Future Generation Computer Systems 21 (2005) 549–558 doi:10.1016/j.future.2004.10.006 Abstract Grids are potentially composed of several thousands of users from different institutions sharing their computing resources (or using resources provided by third parties). Controlling access to these resources is a difficult problem, as it depends on the policies of the organizations the users belong to and of the resource owners. Moreover, a simple authorization implementation, based on a direct user registration on the resources, is not applicable to a large scale environment. In this paper, we describe the solution to this problem developed in the framework of the European DataGrid [M. Draoli, G. Mascari, R. Piccinelli, Project Presentation, DataGrid-11-NOT-0103- 1] and DataTAG [http://www.datatag.org/] projects: the Virtual Organization Membership Service (VOMS) [R. Alfieri, et al., Managing Dynamic User Communities in a Grid of Autonomous Resources, TUBT005, in: Proceedings of the CHEP 2003, 2003]. VOMS allows a fine grained control of the use of the resources both to the users’ organizations and to the resource owners
Virtual organization management across middleware boundaries
No full textOne of the most important challenges in production Grids is to achieve interoperation across several heterogeneous Grid middleware platforms: eScience applications need a coordinated resource sharing among dynamic collections of individuals/institutions, independently from whatever middleware the resources are running. For this reason, there is a great effort going on to define standard interfaces, in order to implement common services that can be used to achieve cross-middlewares interoperability. In this paper, we present our modifications to the Virtual Organization Management Service (VOMS), a widely-known and used tool that acts as an Attribute Authority. We enhanced VOMS to expose the standardized interface of the Security Assertion Markup Language (SAML), and therefore to release SAML assertions. This way we want VOMS to be available on the larger possible number of Grid middleware platforms
Multiplier impact of wine activity on inter-industry interactions
No full textWine is usually studied as a separate activity. Our attempt is to introduce it within the industries composing output that react to disposable income changes. We first harmonize the available data in a Social Accounting framework. From this data base we get the parameters of a multi-industry multi-sectoral model. We apply on the model a type of dispersion analysis based on singular value decompositions. The results show the position held by wine with respect to the other activities in relation to changes in the composition of disposable incomes. They confirm that wine, in a mediterranean country as Italy, is linked to lower disposable incomes.Wine, Input-Output, Macro Multiplier, Singular Values Decompositions, Economic Impact and Correlation, Agribusiness,
Estimating the economic impact of tourism industry through the MM approach
No full textTourism is one of the fastest growing industries in Italy and has proven to be a
valuable source of economic prosperity. The main issue emerging when measuring the
impact of tourism is that tourism is usually considered as a specific industry while in most
applied situations it shows traits of a complex and structured economic activity
characterized by a blend of different industries. We will identify the relationship among the
various industries making up the complex economic activity usually referred as the “tourism
industry”. This is done through the application of the multisectoral analysis to the Italian
case. The evaluation of tourism in terms of economic policy is performed through the
definition of an index of interaction among industries
PROBIO - Filiere Biocombustibili da Girasole - Sintesi dei risultati della ricerca condotta nell'ambito del Progetto Interregionale
No full textInvestments and Sustainability of Public Expenditure in the Health Sector
No full textThe impact of the Italian expenditure for the health care on Gross Domestic
Product (GDP) and on total public expenditure, is in line with those of the
major industrialized countries, and somewhat lower than the European average. The
issue of the Italian health sector is not simply related to the contraction of the expenditure:
in effect, it should be highlighted that Italy currently does not spend “a
lot” and, above all, invests “little” in the mentioned sector. Nevertheless, the health
sector can be a very important flywheel for the economic recovery but, in order to
make this possible, it is necessary to pay a lot of attention, and to invest the best
resources. In this work, the authors intend to develop an analysis of the desirability
of investment on Information and Communication Technologies (ICT) in the health
sector, and the consequent compatibility with current expenditure, by identifying at
the outset the channels multipliers related to the resources at present allocated to the
current health expenditure and capital account
ENERGIA DA BIOMASSE. STATO DELL'ARTE DEL SETTORE NAZIONALE DELLE BIOMASSE ED OPPORTUNITA' DI SVILUPPO
No full textThe economic impact of the Green Certificate market through the Macro Multiplier approach
No full textIn the last decade, as many other European countries, the Italian Government adopted several reforms in order to increase the use of Renewable Energy Sources (RES). The liberalization of the electricity market that represent one of these reforms aims to reach environmental benefits from the substitution of fossil fuel with renewable sources.The Italian Green Certificate market was introduced in 2002 in order to accomplish this objective and represents a mechanism where a quota of renewable electricity is imposed to suppliers in proportion to their sales. The electricity industries are obliged to meet this condition by producing the quantity of renewable electricity by means of a change in their production process, otherwise they must buy a number of certificates corresponding to the quota. This mechanism changes the importance of the electricity industry first in promoting climate protection, than in terms of the impact in the economy as a whole. A policy aimed to develop the market of green certificates may lead to environmental improvement by switching the energy production process to renewable resources. But above all an increase in demand for green certificates, resultant from a reform on the quota of renewable electricity, can generate positive change in all components of the industrial production. For this purpose, the paper aims to quantify the economic impact of a reform on Green Certificate market for the Italian system by means of the Macro Multiplier (MM) approach. The analysis is performed through the Hybrid Input-Output (I-O) model that allows expressing the energy flows in physical terms (GWh) while all other flows are expressed in monetary terms (e). Moreover, through the singular value decomposition of the inverse matrix of the model, which reveals� he set of key structures of the exogenous change of final demand, we identify the appropriate key structure� ble to obtain both the expected positive total output change and the increase of electricity� roduction from RES.Hybrid I-O model,Macro Multiplier,Environmental Policy
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