Cosmological limits on neutrino masses are softened, by more than a factor 2, if Cold Dark Matter (CDM) and Dark Energy (DE) are coupled. In turn, a neutrino mass yielding Ων up to ∼ 0.20 allows coupling levels β ≃ 0.15 or more, already easing the coincidence problem. The coupling, in fact, displaces both P (k) and Cl spectra in a fashion opposite to neutrino mass. Estimates are obtained throug...

The paper introduces a new, comprehensive integrated conceptual data model in a precise way. Central language features cover core modeling concepts as classification, membership, inheritance, interfaces, structured types, aliasing, aggregation, composition, constraints, clustering and relationships. Schema states are thought of as being realized as graphs with appropriate navigation options. A ...

We investigate the stellar composition of bulges and elliptical galaxies as predicted by the CDM paradigm using semi-analytical modelling. We argue that spheroid stars are built up of two main components, merger and quiescent, according to the origin of the stars. The merger component is formed during major mergers by gas driven to the centre, while the quiescent component is formed in gaseous ...

Purpose – To find a relationship between traditional faceted classification schemes and semantic web document annotators, particularly in the linked data environment. Design/methodology/approach – A consideration of the conceptual ideas behind faceted classification and linked data architecture is made. Analysis on selected web documents is performed using Calais’ Semantic Proxy to support the ...

This paper proposes a new methodology to automatically build semantic hierarchies suitable for image annotation and classification. The building of the hierarchy is based on a new measure of semantic similarity. The proposed measure incorporates several sources of information : visual, conceptual and contextual as we defined in this paper. The aim is to provide a measure that best represents im...

Information security audit is a monitoring/logging mechanism to ensure compliance with regulations and to detect abnormalities, security breaches, and privacy violations; however, auditing too many events causes overwhelming use of system resources and impacts performance. Consequently, a classification of events is used to prioritize events and configure the log system. Rules can be applied ac...

Knowledge Base Management Systems are not designed to manage large amounts of data in an efficient manner, contrary to DBMS of which it is the primary purpose. We present an approach that unifies KBMS and DBMS, by providing an efficient management of wide volumes of (shared) data and reasoning capabilities (instance classification). We propose a conceptual structuring of the object space that r...

Two major problems in schema integration are to identify correspondences between different conceptual schemas and to verify that the proposed correspondences are consistent with the semantics of the schemas. This problem can only be effectively addressed if the conceptual schema is expressed in a semantically rich modelling formalism. We introduce such a modelling formalism, the distinguishing ...

Previous work has implicated prefrontal cortices in selecting among and retrieving conceptual information stored elsewhere. However, recent neurophysiological work in monkeys suggests that prefrontal cortex may play a more direct role in representing conceptual information in a flexible context-specific manner. Here, we investigate the nature of visual object representations from perceptual to ...