A group memory of a project is an information space storing the documents produced and exchanged by members of the group, which may include the electronic discussions that took place during the life of the project. Accessing the information in the group memory using a traditional text search method is not always effective as the relationship between the documents and emails (for example the con...

Topic maps are very powerful as they allow to organize information, but they may be very large. Intuitive visual user interfaces may significantly reduce the cognitive load of the user when working with these complex structures. Visualization is a promis ing technique for both enhancing users' perception of structure in large information spaces and providing navigation facilities. It also enabl...

Since the Topic Map standard describes a prospective knowledge-structuring model that can be used in a huge variety of knowledge domains the amount of applications utilizing this standard grew enormously. Anyhow, as far as we know, there is no distributed editor of Topic Maps available on the market, that supports an intuitive possibility to manipulate or visualize Topic Maps in the World Wide ...

This paper introduces a simple and effective chaotic system using a combination of two existing one-dimension (1D) chaotic maps (seed maps). Simulations and performance evaluations show that the proposed system is able to produce many 1D chaotic maps with larger chaotic ranges and better chaotic behaviors compared with their seed maps. To investigate its applications in multimedia security, a n...

In any communication system, including the satellite and the Internet, it is almost impossible to prevent unauthorized people from eavesdropping. When information is broadcast from a satellite or transmitted through the Internet, there is a risk of information interception. Security of image and video data has become increasingly important for many applications, including video conferencing, se...

absTraCT Organizational memories play a significant role in knowledge management, but several challenges confront their use. Artifacts of OM are many and varied. Access and use of the stored artifact are influenced by the user's understanding of these information objects as well as their context. Theories of distributed cogni-tion and the notion of community of practice are used to develop a mo...

In this paper, a framework for organizing and navigating online learning material with respect to the semantic context of documents is described. We propose the use of a fuzzy clustering algorithm and TopicMaps to discover and represent knowledge, respectively. We present a prototype implementation of the framework for semantic browsing of a test collection of

Topic Maps is becoming a recognized way of structuring and navigating knowledge. Since the digital world is moving towards a more and more service oriented reality, it is appropriate to focus on solutions for using topicmaps remotely as services. Two current cases for how this can be done is displayed here, both carried out by Cerpus AS, a small Norwegian company that works with topicmaps in th...

In this article we describe TM4L an environment for building, maintaining, and using standards-based, ontology-aware e-learning repositories. It is based on the idea that concept-driven access to learning material implemented as a Topic Map can bridge the gap between a learner and targeted knowledge. One of the driving goals of this work is to increase the reusability of available educational r...