scholarly journals MATHEMATICAL MODEL OF NUT ROTATION USING A WRENCH IN A VIRTUAL REALITY ENVIRONMENT

InterConf ◽  
2021 ◽  
pp. 384-392
Author(s):  
Dmitriy Zuev ◽  
Igor Fedorov ◽  
Natalya Astapenko ◽  
Kayrat Koshekov ◽  
Zharas Ainakulov
Keyword(s):  
Mathematical Model ◽  
Virtual Reality ◽  
Virtual Reality Environment ◽  
The Third ◽  
Axis Of Symmetry

The article discusses a mathematical model of the behavior of two bodiesrelative to the third in a virtual reality environment using manipulators. Rotation of the nut, relative to the rotation of the wrench along the axis of symmetry of the bolt screw using the Oculus Quest 2 manipulators.

scholarly journals Virtual reality environment to study the ergonomic features of firefighters’ activity

2018 ◽  
Vol 210 ◽  
pp. 02050 ◽  
Author(s):  
Tadeusz Nowicki ◽  
Jarosław Koszela ◽  
Łukasz Matuszelański
Keyword(s):  
Virtual Reality ◽  
Vertical Displacement ◽  
Point Of View ◽  
Simulation Environment ◽  
Virtual Reality Environment ◽  
Work Time ◽  
Rescue Operation ◽  
The Third ◽  
Criterion Functions ◽  
Emergency Equipment

This work considers the problem of studying the strategy of equipment location on the firefighting vehicle. A unified firefighter’s vehicle Euro Truck is being designed. The problem of location the emergency equipment on the vehicle is very important from the point of view of firefighters ergonomic. It is consider two ergonomic criterion functions: how long is the distance of horizontal and vertical displacement of equipment during its unloading. The third ergonomic criterion is optimization of firefighters work time. These criteria lead to a reduction in the physical load of firefighters’ bodies. Computer simulation, including virtual reality, allows for a very detailed study of the work of firefighters during the removal of equipment from the vehicle. A simulation environment with virtual reality was built and tested in order to measure ergonomic criteria during firefighters’ work in a rescue operation for various action scenarios.

scholarly journals Testing a Biological Weapon Detection System in a Distributed Virtual Reality Environment

2001 ◽  
Vol 5 (1) ◽  
pp. 24-37
Author(s):  
Paul Beckman
Keyword(s):  
Virtual Reality ◽  
Detection System ◽  
Second Phase ◽  
Cloud Detection ◽  
Virtual Reality Environment ◽  
Human In The Loop ◽  
The Third ◽  
Helicopter Flight ◽  
Time Dispersion ◽  
Distributed Virtual Reality

A study called Bio-Sim was sponsored by the U.S. Army to examine the LR-BSDS (Long-Range Biological Standoff Detection System), a laser-based biological cloud detector. Testing of the device was performed in a distributed virtual reality environment (DVRE). The three primary objectives of the study were to: 1) determine appropriate tactics, techniques, and procedures for use of the LR-BSDS, 2) gain a better understanding of those battlefield situations and characteristics that limit the effective use of the LR-BSDS, and 3) demonstrate the potential to use a DVRE simulation for training using the LR-BSDS. This paper will focus on the third of those objectives. The study consisted of three phases. The first phase involved calculating theoretical concentration limits of a dispersed biohazard as a function of time, dispersion concentration, and distance to sensor. The second phase resulted in a set of abbreviated bio-cloud detection missions run in a DVRE. The third phase was a set of full-length human-in-the-loop trial missions run by trained LR-BSDS operators and helicopter flight crews, using a DVRE and computer-based simulators for the LR-BSDS, helicopter, biocloud dispersion, and bio-cloud transport.

Top-Down Processing and Visual Reorientation Illusions in a Virtual Reality Environment

2004 ◽  
Vol 63 (3) ◽  
pp. 143-149 ◽  
Author(s):  
Fred W. Mast ◽  
Charles M. Oman
Keyword(s):  
Virtual Reality ◽  
Visual Processing ◽  
Line Length ◽  
Perceptual Cues ◽  
Virtual Reality Environment ◽  
Top Down ◽  
Test Conditions ◽  
The Subject ◽  
Processing Mechanisms

The role of top-down processing on the horizontal-vertical line length illusion was examined by means of an ambiguous room with dual visual verticals. In one of the test conditions, the subjects were cued to one of the two verticals and were instructed to cognitively reassign the apparent vertical to the cued orientation. When they have mentally adjusted their perception, two lines in a plus sign configuration appeared and the subjects had to evaluate which line was longer. The results showed that the line length appeared longer when it was aligned with the direction of the vertical currently perceived by the subject. This study provides a demonstration that top-down processing influences lower level visual processing mechanisms. In another test condition, the subjects had all perceptual cues available and the influence was even stronger.

DEFORMATION OF B-SPLINE BASED PLASTICINE MATERIAL MODEL IN VIRTUAL REALITY ENVIRONMENT

2017 ◽  
Vol 5 (3) ◽  
pp. 15
Author(s):  
GANDOTRA SANDEEP ◽  
Pungotra Harish ◽  
Moudgil Prince Kumar ◽  
◽  
◽  
...  
Keyword(s):  
Virtual Reality ◽  
Material Model ◽  
Virtual Reality Environment ◽  
B Spline

scholarly journals Combining tDCS With a Motor-Cognitive Task to Reduce the Negative Impact of Dual-Tasking on the Gait of Older Adults

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 287-288
Author(s):  
Jeffrey Hausdorff ◽  
Nofar Schneider ◽  
Marina Brozgol ◽  
Pablo Cornejo Thumm ◽  
Nir Giladi ◽  
...  
Keyword(s):  
Older Adults ◽  
Virtual Reality ◽  
Executive Function ◽  
Dual Task ◽  
Gait Speed ◽  
Negative Impact ◽  
Virtual Reality Environment ◽  
Dual Tasking ◽  
Concurrent Performance ◽  
Dual Task Cost

Abstract The simultaneous performance of a secondary task while walking (i.e., dual tasking) increases motor-cognitive interference and fall risk in older adults. Combining transcranial direct current stimulation (tDCS) with the concurrent performance of a task that putatively involves the same brain networks targeted by the tDCS may reduce the negative impact of dual-tasking on walking. We examined whether tDCS applied while walking reduces the dual-task costs to gait and whether this combination is better than tDCS alone or walking alone (with sham stimulation). In 25 healthy older adults (aged 75.7±10.5yrs), a double-blind, within-subject, cross-over pilot study evaluated the acute after-effects of 20 minutes of tDCS targeting the primary motor cortex and the dorsal lateral pre frontal cortex during three separate sessions:1) tDCS while walking on a treadmill in a virtual-reality environment (tDCS+walking), 2) tDCS while seated (tDCS+seated), and 3) walking in the virtual-reality environment with sham tDCS (sham+walking). The complex walking condition taxed motor and cognitive abilities. During each session, single- and dual-task walking and cognitive function were assessed before and immediately after stimulation. Compared to pre-tDCS performance, tDCS+walking reduced the dual-task cost to gait speed (p=0.004) and other gait features (e.g., variability p=0.02), and improved (p<0.001) executive function (Stroop interference score). tDCS+seated and sham+walking did not affect the dual-task cost to gait speed (p>0.17). These initial findings demonstrate that tDCS delivered during challenging walking ameliorates dual-task gait and executive function in older adults, suggesting that the concurrent performance of related tasks enhances the efficacy of the neural stimulation and mobility.

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