We propose a path-based scheme for storage and retrieval of RDF data using a relational database. The Semantic Web is much anticipated as the nextgeneration web where high-level processing of web resources are enabled by underlying metadata described in RDF format. A typical application of RDF is to describe ontologies or dictionaries, but in such applications, the size of RDF data is large. As...

The Semantic Web is a candidate for the next generation of the World Wide Web. It is anticipated that the number of metadata written in RDF (Resource Description Framework) and RDF Schema will increase as the Semantic Web becomes popular. In such a situation, demand for querying metadata described with RDF and RDF Schema will also increase, and therefore effective query retrieval of RDF data is...

Resource Description Framework (RDF) is a language which represents information about resources. In order to search RDF resource descriptions, several RDF query languages such as RQL and SquishQL have been proposed. However, these RDF query languages do not use XML syntax and they have limited functionality. xRQL is proposed to solve these issues by defining an XML-based RDF query language with...

Many approaches for RDF stores exist, most of them using very straight-forward techniques to store triples in or mapping RDF Schema classes to database tables. In this paper we propose an RDF store that uses a natural mapping of RDF resources to database tables that does not rely on RDF Schema, but constructs a schema based on the occurring signatures, where a signature is the set of properties...

The Semantic Web facilitates integrating partial knowledge and finding evidence for hypothesis from web knowledge sources. However, the appropriate level of granularity for tracking provenance of RDF graph remains in debate. RDF document is too coarse since it could contain irrelevant information. RDF triple will fail when two triples share the same blank node. Therefore, this paper investigate...

The RDF language (Resource Description Framework) allows nodes in an RDF graph to be unlabeled – “blank nodes”. While blank nodes and certain other features are convenient for RDF authors, their unrestricted use causes complications to RDF consumers, such as when attempting to compare RDF graphs, which in the general case is as difficult as the graph isomorphism problem. This paper proposes a s...

Today, with the advancement of technology, turning waste into fuel has been considered as an inexhaustible source of energy production, especially in industries with high energy consumption. The most important of these industries are Cement and Iron Smelting factories. Babol, as one of the largest provinces in the north of the country, has been facing waste management crisis for several years w...

In this work, the radial distribution function (RDF) of H2 adsorption on coronene (C24) and its Si Substituted forms was investigated by Monte Carlo method. The effect of number and position of silicon substituent on the Coronene (C24) was compared. The maximum value of RDF at 298 K and 0.1 MPa is 4.34 for 18 Si, A structure at 0.73 Å. On the basis of results, t...