Papers by Zavisa Bjelogrlic
Most of the proposed approaches in automatic service selection assume the existence of a common o... more Most of the proposed approaches in automatic service selection assume the existence of a common ontology among communicating agents. However, this assumption becomes difficult to support in environments, where the agents' ontologies can evolve independently based on their individual experiences. In this paper, we propose an approach through which agents can cooperatively update their ontologies and teach one another concepts from their ontologies. This leads to a society of agents with different but overlapping ontologies. Our simulation results show that mutually accepted concepts emerge based on the interactions of the agents. Further, agents learn and use concepts that are created by other to express their own service needs.
Lecture Notes in Computer Science, 2003
The Semantic Web and RDF offer a powerful platform for a wide range of applications. However, at ... more The Semantic Web and RDF offer a powerful platform for a wide range of applications. However, at this time, the semantic business is still in an embryonic stage. This paper analyses real-life applications: (i) A system in operation used to improve the presentation of corporate data, (ii) a prototype of a news clipping service and (iii) a feasibility analysis of a distributed, public administration database. Common to these applications is a "web database" model where resources are "URIed"-made available on the Web-and "RDF-ed"-described by one or multiple authorities. Descriptions are processed by RDFStore and made available to applications. The success factors of these three applications are analysed, and an application model is drawn up with requirements and desirable features for RDF Engines. In conclusion, we look at how and where the Semantic Web business can grow.
The Semantic Web is a logical evolution of the existing Web. It is based on a common conceptual d... more The Semantic Web is a logical evolution of the existing Web. It is based on a common conceptual data model of great generality that allows both humans and machines to work with interrelated, but disjoint, information as if it was a single global database. The design and implementation of a general, scalable, federated and flexible data storage and indexing model, which corresponds to the data model of the Semantic Web, is fundamental for the success and deployment of such a system. The generality of the RDF data model presents unique challenges to efficient storage, indexing and querying engines. This paper presents our experience and work related to RDFStore which implements a new flexible indexing and query model. The model is tailored to RDF data and is designed around the Semantic Web from the ground up. The paper describes the underlying indexing algorithm, together with comparisons to other existing RDF storage and query strategies.
Personal computer-based analysis of heart rate fluctuations in human subjects (ECG)
[1989] Proceedings. Computers in Cardiology
Abstract A personal-computer-based system for quantitation of spontaneous and provoked heart rate... more Abstract A personal-computer-based system for quantitation of spontaneous and provoked heart rate fluctuations in a clinical setting is described. The system was developed for screening and subsequent follow-up of neurological patients with autonomic-nervous-...
Uploads
Papers by Zavisa Bjelogrlic