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...

Accurate 3D modellers of real-world scenes are important tools for visualizing or understanding outside environments. The paper considers a camera-based 3D reconstruction system where stereo cameras are mounted on a mobile platform, recording images while moving through the scene. Due to the limited viewing angle of the cameras, resulting reconstructions often result in missing (e.g. while occl...

The current paper presents a method for image watermarking based on chaotic sequences produced by different functions. The effect of embedding a chaotic watermark on an image is examined. Extensive experimental results for JPEG and filtering attacks on images watermarked by the different functions are presented together with a comparative study of them. The results show that efficient watermark...

In this paper we address the issue of expressing and using contextual factors in information seeking tasks. Following our perception of context for the IR domain, we discuss the contextual support provided in TM4L an environment for building and using topic-centered learning repositories. We propose an extension of the Topic Maps model with contexts and an approach for contextual retrieval that...

This paper shows how multi-dimensional functions, describing the operation of complex equipment, can be learned. The functions are points in a shape space, each produced by morphing a prototypical function located at its origin. The prototypical function and the space’s dimensions, which define morphological operations, are learned from a set of existing functions. New ones are generated by ave...

Variable speed, permanent magnet synchronous machines with hybrid excitation have attracted much attention due to their flux-control potential. In this paper, a design of axial flux iron poles in the rotor and an additional electrically controlled source fixed on stator is presented. This paper shows results pertaining air-gap control, electromagnetic losses, torque, back emf efficiency maps ob...

Abstract Previous work using multibeam sonar to map diffuse hydrothermal flows is extended estimate the heat output of flows. In first step toward inversion, temperature statistics are obtained from data and compared thermistor in order set value an empirical constant. Finally, a simple model used obtain heat‐flux density sonar‐derived statistics. The method applied Cabled Observatory Vent Imag...