Attribute-based Data Access over P2P Systems

An ontology-based data access (OBDA) system is composed of one or more data sources, an ontology that provides a conceptual view of the data, and declarative mappings that relate the data and ontology schemas. In order to debug and optimize such systems, it is important to be able to analyze and compare OBDA specifications. Recent work in this direction compared specifications using classical n...

The Internal Revenue Service Business Modernization Project undertaken by the Tax Agency of the US Government has been singled out as an example of a massive failure. As envisioned, the project was intended as an Enterprise-wide intervention that would provide modern services and effective data access to citizenry and several government agencies. After more than a decade and 3 billion dollars l...

An ontology-based data access (OBDA) system is composed of one or more data sources, an ontology that provides a conceptual view of the data, and declarative mappings that relate the data and ontology schemas. In order to debug and optimize such systems, it is important to be able to analyze and compare OBDA specifications. Recent work in this direction compared specifications using classical n...

A data gridd is a collectionn of geographically dispersedd storag e resources over wide area network.. The goal of data gridd system is too provide a large virtual storage framewor kk withh unlimitedd power throughh collaborationn amongg individuals,, institutions,, andd resourc es.. Inn this study,, we first review a number of data gridd services suchh as,, too just name a few,, metadata servi...

The major advantages of flash memory such as small physical size, no mechanical components, low power consumption, and high performance have made it likely to replace the magnetic disk drives in more and more systems. Many research efforts have been invested in employing flash memory to build high performance and large-scale storage systems for data-intensive applications. However, the enduranc...