A growing number of domains are adopting semantic models as a centralized gateway to heterogeneous data sources, or directly for modeling and managing relevant information. In such contexts, it is crucial to grant access to the semantic model and its data only to the authorized users. In this paper, we present a fine-grained access control model specifically tailored to semantic models. One of the relevant features of the model is the granularity of the resources that can be protected. Access control can be enforced at the level of both the model's concepts and the concepts' instances by means of a query rewriting strategy. The proposed model has been implemented adopting the XACML standard and the SeRQL query language; services exposed by the implementation can be used to transparetly integrate authorization into existing systems.

This paper presents the case study of an interactive digital narrative and real-time visualization of anItalian theatre during the 19th century. This case study illustrates how to integrate the traditional concepts of cultural heritage with Virtual Reality (VR) technologies. In this way virtual reconstructions of cultural sites are lift up to an exciting new edutainment level. Novel multimedia interaction devices and digital narrative representations combined with environment historical and architectural certified, offer to the users real-time immersive visualization where to live experiences of the past. Starting to the studies of several project strengthening the great benefits connected at the use of the VR technologies in the cultural fields, the paper illustrates the motivations that have triggered a collaboration

Abstract:In this paper we present the results from an analysis focusing on security threats that can arise against an SQL server when included in Web application environments. The approach used is based on the STRIDE classification methodology. The results presented provide also some general guidelines and countermeasures against the different attacks that can exploit the identified vulnerabilities.

In this paper we present a system we have built to disseminate cultural heritage distributed across multiple museums. Our system addresses the requirements of two categories of users: the end users that need to access information according to their interests and interaction preferences, and the domain experts and museum curators that need to develop thematic tours providing end users with a better understanding of the single artefact or collection. In our approach we make use of a semantic representation of the given heritage domain in order to build multiple visual interfaces, called "Virtual Wings" (VWs ). Such interfaces allow users to navigate through data available from digital archives and thematic tours and to create their own personalized virtual visits. An interactive application integrating personalized digital guides (using PDAs) and 360 panoramic images is the example of VW presented.

In this paper we discuss issues concerning the development of interactive virtual reality (VR) environments. We argue that the integration of such type of environments with database technology has the potential of providing on one side much flexibility and on the other hand of resulting in enhanced interfaces for accessing contents from digital archives. The paper also describes a project dealing with the dissemination of cultural heritage contents. Within the project an integrated framework has been developed that enhances conventional VR environments with database interactions.