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John P. Zenyuh

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Publications by John P. Zenyuh (bibliography)

1988

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Zenyuh, John P., Reising, John M., Walchli, Scott and Biers, David (1988): A Comparison of a Stereographic 3-D Display versus a 2-D Display Using an Advanced Air-to-Air Format. In: Proceedings of the Human Factors Society 32nd Annual Meeting 1988. pp. 53-57.

“This study compared the relative abilities of a stereoscopic 3-D display versus a conventional 2-D display to provide spatial location information. The evaluation was conducted as a part mission, full-task simulation in the context of an air-to-air fighter mission. A dual task paradigm was employed requiring the subjects to acquire situation awareness of their immediate air-to-air environment while simultaneously performing a simple flight tasks. Situation awareness was defined as the ability to visually search a spatial quadrant of the air-to-air situation display relative to the ownship symbol and identify the number of aircraft symbols in a given target group found in that quadrant. The simulated flight task was a two-axis tracking task on a dynamic Head-Up Display format, using a force-stick controller. The subject's response speed and accuracy on the search task and deviations from the given track on the flight task were used as performance measures in this study. The results showed a significant accuracy performance advantage for those formats presented with the stereoscopic 3-D display.”

1987

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Zenyuh, John P., Reising, John M., McClain, James E., Barbato, Diana J. and Hartsock, David C. (1987): Advanced Head-Up Display (HUD) Symbology: Aiding Unusual Attitude Recovery. In: Proceedings of the Human Factors Society 31st Annual Meeting 1987. pp. 1067-1071.

“The head-up displays (HUD's) of today's fighter aircraft present numerous symbology formats to the pilot which are essential for successful performance of a variety of flight tasks from navigation to weapons delivery. One common element in all of these formats is the pitch ladder, designed to provide the pilot with aircraft attitude even in the absence of external visual cues. Unlike the head down attitude director indicator (ADI), the HUD pitch ladder's intent is to aid the pilot in recovering from an unusual attitude while staying head-up. The purpose of this research was to compare the relative effectiveness of two changes to current pitch ladder symbology designed to enhance the pilot's ability to recover from unusual attitudes -- the use of angled pitch bars versus standard straight pitch bars and multicolor versus the standard monochromatic symbology. The results showed that, in extreme unusual attitudes, the use of both the angled pitch bars and color contributed to better flight performance. In the non-extreme attitudes however, where the horizon line is always visible, the standard symbology was sufficient for recovery.”

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