Participants used a helmet-mounted display (HMD) and a desk-top (monitor) display to learn the layouts of two large-scale virtual environments (VEs) through repeated, direct navigational experience. Both VEs were ‘‘virtual buildings’’ containing more than seventy rooms. Participants using the HMD navigated the buildings significantly more quickly and developed a significantly more accurate sens...

This paper reviews the literature on factors that influence the visual (ocular) accommodation response when using see-through virtual image displays (VIDs) such as head-up and helmet-mounted displays. This review suggests that the overall accommodation response is determined by a complex interaction of many factors, some of which are associated with the visual stimulus (such as blur and chromat...

Observers binocularly viewed a target placed in a large open field under two viewing conditions: unrestricted field of view and reduced field of view, as effected using a simulated head-mounted display. Observers indicated the perceived distance of the target, which ranged from 2 to 15 m, using both verbal report and blind walking. For neither response was there a reliable effect of limiting th...

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Two novel methods of Modulated-Temperature Thermal Analysis are described. These are loosely-termed `̀ Constrained Rate DSC'' and `̀ Modulated-Temperature TMA''. In the ®rst, the sample response is used to control the temperature program of a DSC in a method analogous to Controlled Rate Thermal Analysis. This results in a temperature modulation which is variable in period, amplitude and underlyin...

Virtual Reality (VR) systems allow the user to interact with objects which aren’t really there. New experiences and new capabilities are made possible by creating a virtual environment in which the user manipulates objects, builds worlds and communicates with other virtual users. This paper considers the popular image of VR with head-mounted displays and instrumented gloves and then takes a bro...

MR-mirror is a novel Mixed-Reality (MR) display system created by using real and virtual mirrors. It merges real visual information reflected on a real mirror and a virtual one displayed on an electronic monitor. A user’s body is presented by the reflection on the real mirror, and virtual objects are presented on a monitor that is visible through the real mirror. Users can observe an MR scene w...

Task reassignments in 2D mesh-connected systems (2D-MSs) have been researched for several decades. We propose a hierarchical 2D mesh-connected system (2D-HMS) in order to exploit the regular nature of a 2D-MS. In our approach priority-based task assignments and reassignments in a 2D-HMS are represented by tableaux and their algorithms. We show how task relocations for a priority-based task reas...

The sinking costs of producing digital video and its growing presence on the Internet suggest that it has potential for use in web-based learning technologies. However, there have been few investigations into how the kind of interaction one has with video impacts subsequent learning. In this in-progress study participants are asked to watch video of an expert taking apart a toaster and describi...

A head-mounted projective display (HMPD) consists of a pair of miniature projection lenses, beam splitters, and displays mounted on the helmet and retro-reflective sheeting materials placed strategically in the environment. It has been recently proposed as an alternative to existing 3D visualization devices. In this paper, we first briefly review the HMPD technology, including its featured capa...