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Eric R. Johnston

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Publications by Eric R. Johnston (bibliography)

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1996
 
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Adelstein, Bernard D., Johnston, Eric R. and Ellis, Stephen R. (1996): Dynamic Response of Electromagnetic Spatial Displacement Trackers. In Presence: Teleoperators and Virtual Environments, 5 (3) pp. 302-318.

1992
 
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Adelstein, Bernard D., Johnston, Eric R. and Ellis, Stephen R. (1992): A Testbed for Characterizing Dynamic Response of Virtual Environment Spatial Sensors. In: Mackinlay, Jock D. and Green, Mark (eds.) Proceedings of the 5th annual ACM symposium on User interface software and technology November 15 - 18, 1992, Monteray, California, United States. pp. 15-22.

This paper describes a testbed and method for characterizing the dynamic response of the type of spatial displacement transducers commonly used in virtual environment (VE) applications. The testbed consists of a motorized rotary swing arm that imparts known displacement inputs to the VE sensor. The experimental method involves a series of tests in which the sensor is displayed back and forth at a number of controlled frequencies that span the bandwidth of volitional human movement. During the tests, actual swing arm angle and reported VE sensor displacements are collected and time stamped. Because of the time stamping technique, the response time of the sensor can be measured directly, independently of latencies in data transmission from the sensor unit and any processing by the interface application running on the host computer. Analysis of these experimental results allows sensor time delay and gain characteristics to be determined as a functions of input frequency. Results from tests of several different VE spatial sensors (Ascension, Logitech, and Polhemus) are presented here to demonstrate use of the testbed and method.

© All rights reserved Adelstein et al. and/or ACM Press

 
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Changes to this page (author)

01 Jun 2009: Modified
28 Apr 2003: Added

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URL: http://www.interaction-design.org/references/authors/eric_r__johnston.html
Jul 30

It's all about one thing: creative problem-solving to get the story out.

-- Robert Greenberg, R/GA, 2006

 
 

Featured chapter

Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess

User Experience and Experience Design !

 
 

Our Latest Books

Kumar and Herger 2013: Gamification at Work: Designing Engaging Business Software...
by Janaki Mythily Kumar and Mario Herger

 
Start reading

Whitworth and Ahmad 2013: The Social Design of Technical Systems: Building technologies for communities...
by Brian Whitworth and Adnan Ahmad

 
Start reading

Soegaard and Dam 2013: The Encyclopedia of Human-Computer Interaction, 2nd Ed....
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

Help us help you!