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ReferencesNavigation arrowAuthorsNavigation arrowGerard C. Jorna
Jun 19

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Gerard C. Jorna

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Publications by Gerard C. Jorna (bibliography)

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1991
 
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Jorna, Gerard C. (1991): Image Quality Determines Differences in Reading Performance and Perceived Image Quality with CRT and Hard-Copy Displays. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 1432-1436.

“The effects of physical image quality on reading and on perceived image quality from CRT and hard-copy (photograph) displays were studied. The results showed that as the image quality of a display increased, indicated by an increase in the value of the modulation transfer function area (MTFA), the reading speed and subjective image quality ratings increased. This change in reading speed and perceived image quality occurred similarly for both hard-copy and soft-copy conditions. If the image qualities of the displayed text are similar, hard-copy and soft-copy displays will yield equivalent reading speeds.”

© All rights reserved Jorna and/or Human Factors Society

1990
 
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Han, Sung H., Jorna, Gerard C., Miller, Richard H. and Tan, Kay C. (1990): A Comparison of Four Input Devices for the Macintosh Interface. In: D., Woods, and E., Roth, (eds.) Proceedings of the Human Factors Society 34th Annual Meeting 1990, Santa Monica, USA. pp. 267-271.

“Numerous computer input devices have been designed and evaluated in the last decade. In most evaluations, simple pointing and tracking tasks were used that do not adequately represent today's computer tasks. The following research evaluated four input devices with respect to usability and preference issues. The UnMouse, the Turbo mouse, and the Felix mouse were compared with the Apple Macintosh Mouse on four different types of task: tracking (point-and-click), desktop manipulation (e.g., point, click, and drag), word processing, and graphics generation. Users expressed preferences for the devices in terms of lower-arm fatigue, precision of control, and comfort of movement. Results indicate that the Macintosh Mouse and the Felix device were quicker and preferred over the other devices.”

© All rights reserved Han et al. and/or Human Factors Society

1988
 
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Jorna, Gerard C., Mohageg, Michael F. and Snyder, Harry L. (1988): Performance, Perceived Safety, and Comfort of the Alternating Tread Stair. In: Proceedings of the Human Factors Society 32nd Annual Meeting 1988. pp. 981-984.

“This study determined the perceived safety and comfort of an alternating tread stair and a conventional ships ladder. The alternating tread stair and the conventional ships ladder were also compared with respect to travel time and missteps. Subjects in military uniform ascended and descended both the alternating tread stair and the conventional ships ladder under load and no-load condition. In the load condition subjects performed trials while carrying a 9-kg tool box, and in the no-load condition trials were performed without the tool box. Results indicate that the alternating tread stair is perceived to be safer and more comfortable to use. Moreover, the alternating tread stair had significantly fewer missteps.”

© All rights reserved Jorna et al. and/or Human Factors Society

 
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26 Jun 2007: Modified
26 Jun 2007: Modified
25 Jun 2007: Added

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Jun 19

“ ... there are no simple 'right' answers for most web design questions (at least not for the important ones). What works is good, integrated design that fills a need--carefully thought out, well executed, and tested. ”

-- Steve Krug, Don't Make Me Think, p. 136

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

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

 
Start reading

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

 
Start reading
 
 

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