A framework to maximise the communicative power of knowledge visualisations

Knowledge visualisation, in the field of information systems, is both a process and a product, informed by the closely aligned fields of information visualisation and knowledg management. Knowledge visualisation has untapped potential within the purview of knowledge communication. Even so, knowledge visualisations are infrequently deployed due to a lack of evidence-based guidance. To improve this situation, we carried out a systematic literature review to derive a number of “lenses” that can be used to reveal the essential perspectives to feed into the visualisation production process.We propose a conceptual framework which incorporates these lenses to guide producers of knowledge visualisations. This framework uses the different lenses to reveal critical perspectives that need to be considered during the design process. We conclude by demonstrating how this framework could be used to produce an effective knowledge visualisation

Human motion retrieval based on freehand sketch

In this paper, we present an integrated framework of human motion retrieval based on freehand sketch. With some simple rules, the user can acquire a desired motion by sketching several key postures. To retrieve efficiently and accurately by sketch, the 3D postures are projected onto several 2D planes. The limb direction feature is proposed to represent the input sketch and the projected-postures. Furthermore, a novel index structure based on k-d tree is constructed to index the motions in the database, which speeds up the retrieval process. With our posture-by-posture retrieval algorithm, a continuous motion can be got directly or generated by using a pre-computed graph structure. What's more, our system provides an intuitive user interface. The experimental results demonstrate the effectiveness of our method. © 2014 John Wiley & Sons, Ltd

Achievements during the 90's of Chile's ICT in Education Program: an International Perspective

This paper presents the main results of a national survey of the Chilean educational ICT infrastructure and its implementation in schools, and it puts these results in an international perspective. The survey was carried out in 1999 and its design followed the guidelines of the international SITES M1 study, sponsored by the IEA. In general terms, the results presented in this report place Chile in quite a good position in the international ranking with respect to several indicators related to ICT in education, especially in teacher training. Moreover, on many indicators Chile's results are similar or even better than the ones shown by developed countries such as Japan, Italy and France. Also, they show some challenges related to the provision of infrastructure (hardware) and ICT resources (software), particularly in primary education. Finally, they show opportunities for deepening further the instructional use of ICT in schools.This paper presents the main results of a national survey of the Chilean educational ICT infrastructure and its implementation in schools, and it puts these results in an international perspective. The survey was carried out in 1999 and its design followed the guidelines of the international SITES M1 study, sponsored by the IEA. In general terms, the results presented in this report place Chile in quite a good position in the international ranking with respect to several indicators related to ICT in education, especially in teacher training. Moreover, on many indicators Chile's results are similar or even better than the ones shown by developed countries such as Japan, Italy and France. Also, they show some challenges related to the provision of infrastructure (hardware) and ICT resources (software), particularly in primary education. Finally, they show opportunities for deepening further the instructional use of ICT in schools

The compression issues of panoramic video

The paper proposes efficient data compression techniques for panoramic video. Panoramic videos have been used as a means for representing dynamic scenes or paths along a static environment. They allow the user to change viewpoints interactively at a point in time or space. High-resolution panoramic videos, while desirable, consume a significant amount of storage and bandwidth for transmission, and make real-time decoding very computationally intensive. A high performance MPEG-like compression algorithm, which takes into account the random access requirements and the redundancies of the panoramic video, is presented. The transmission aspects of panoramic video over cable network, LAN and Internet are also briefly discussed.published_or_final_versio