From a theoretical point of view, the Semantic Web is understood in terms of a stack with RDF being one of its layers. A Semantic Web application operates on the common data model expressed in RDF. Reality is a bit different, though. As legacy data has to be processed in order to realise the Semantic Web, a number of questions arise when one is after processing RDF graphs on the Semantic Web. T...

The foundation language for the Semantic Web is the Resource Description Framework (RDF). RDF is intended to describe the Web metadata so that the Web content is not only machine readable but also machine understandable. In this way one can better support the interoperability of Web applications. RDF Schema (RDFS) is used to describe different RDF vocabularies (schemas), i.e., the classes and p...

Security issues for the Resource Description Framework (RDF) [RDF] are today crucial due to the key role played by RDF for the semantic web [LEE01]. However, despite its importance, RDF security is still a novel area and very little work has been done so far. In this paper, we make a first step in this direction by proposing an approach for using RDF for policy specification and enforcement.

In this study, the radial distribution and gravimetric storage capacities of hydrogen on coronene (C24H12) and its Si substituted forms, C24H12, C24-nSinH12 (n= 4-24), have been investigated at 298 K and 0.1 MPa (standard situation) using (N,V,T) Monte Carlo simulation by Lennard-Jones (LJ) 12-6 potential. The results show that the increase of number of silicon substitution doesn’t have any eff...

‎A Roman dominating function (RDF) on a graph G=(V,E) is a function  f : V → {0, 1, 2}  such that every vertex u for which f(u)=0 is‎ ‎adjacent to at least one vertex v for which f(v)=2‎. ‎An RDF f is called‎‎an outer independent Roman dominating function (OIRDF) if the set of‎‎vertices assigned a 0 under f is an independent set‎. ‎The weight of an‎‎OIRDF is the sum of its function values over ...

A Roman dominating function (RDF) on a graph $G$ is a function $f : V (G) to {0, 1, 2}$satisfying the condition that every vertex $u$ for which $f(u) = 0$ is adjacent to at least onevertex $v$ for which $f(v) = 2$. A Roman dominating function $f$ is called an outer-independentRoman dominating function (OIRDF) on $G$ if the set ${vin Vmid f(v)=0}$ is independent.The (outer-independent) Roman dom...

Resource Description Framework (RDF) is a standard for representing information that can be identified using a Universal Resource Identifier. In particular, it is intended for representing metadata about Web resources. RDF is being used in numerous application areas, including Life Sciences, Digital Libraries, and Intelligence. The RDF data structure is a directed graph or network. Current solu...

Semantic inferencing and querying across largescale RDF triple stores is notoriously slow. Our objective is to expedite this process by employing Google’s MapReduce framework to implement scale-out distributed querying and reasoning. This approach requires RDF graphs to be decomposed into smaller units that are distributed across computational nodes. RDF Molecules appear to offer an ideal appro...

In order to explore RDF data in decision-making, there is an increasing demand for online analytical processing of such data. Since RDF data model is a graph model and highly flexible, it poses some challenges for analytical tasks. Although many systems have been developed to store RDF data, few of them can perform analytical tasks due to many reasons. Here, we present an online analysis system...