Data replication and deployment of local SPARQL endpoints improve scalability and availability of public SPARQL endpoints, making the consumption of Linked Data a reality. This solution requires synchronization and specific query processing strategies to take advantage of replication. However, existing replication aware techniques in federations of SPARQL endpoints do not consider data dynamici...

Components Of The Shelf tools (COTS) are now widely distributed, of good quality, relatively cheap and cover most of the application domains. It is thus a surprise to consider that it is uncommon to reuse COTS when building large applications. At least it is recognized that building a large application based on COTS is a tough issue. This paper seeks to show why it is difficult; it is argued th...

Identity federations are emerging in the last years in order to make easier the deployment of resource sharing environments among organizations. One common feature of those environments is the use of access control mechanisms based on the user identity. However, most of those federations have realized that user identity is not enough to offer a more grained access control and value added servic...

In this paper, we address the problem of federation formation for a set of CPs, whose solution is necessary to exploit the potential of cloud federations for the reduction of the energy bill. We devise a distributed algorithm, based on cooperative game theory, that allows a set of CPs to cooperatively set up their federations in such a way that their individual profit is increased with respect ...

Digital services aimed at humans need to ensure user identity. Governments and institutions confront the identity problem when migrating their face to face services to the digital world, where no facial identification is plausible. On the other hand, users concerns regarding their privacy and security are a barrier to be overcome during the migration. Identity federations are envisioned to unif...

Cloud Computing is already a successful paradigm for distributed computing and is still growing in popularity. However, many problems still linger in the application of this model and some new ideas are emerging to help leverage its features even further. One of these ideas is the cloud federation, which is a way of aggregating different clouds to enable the sharing of resources and increase sc...

Achieving interoperability, i.e. creating identity federations between different Electronic identities (eID) systems, has gained relevance throughout the past years. A serious problem of identity federations is the missing harmonization between various attribute providers (APs). In closed eID systems, ontologies allow a higher degree of automation in the process of aligning and aggregating attr...

abstract the aim of this study was to validate and localize lawson’s (2002) knowledge management and winand et al. (2009) performance models and to determine their effects and relationships in iran sports federations. this study was a descriptive-correlation research. the population included presidents, vice presidents, general secretaries, committee managers and experts in all sports federatio...