MIL-HDBK-1908B
Dialogue (or dialog) uci. A structured series of interchanges between a user and a computer. Dialogues can be computer initiated, e.g., question and answer, or user initiated, e.g., command languages.
Dichotic snv. The condition in which the sound stimulus presented at one ear differs from the sound stimulus presented at the other ear. The stimulus may differ in sound pressure, frequency, phase, time, duration, bandwidth, or other characteristics.
Dimension uci.. A scale or categorization along which data may vary, taking different values at different times. For example, relevant dimensions for an aircraft might include its heading, speed, and altitude.
Direction designation uci. User entry of directional data (azimuth, bearing, heading) on a display.
Display format uci/gen. The organization of different types or elements of data in a display, including information about the data such as labels, and other user guidance, such as prompts of error messages. This may also refer to the size of the display or the ratio of the display width to height.
Display framing uci. User control of display coverage by display movement, including paging, scrolling, offset, and expansion.
Display generation uci. The means of specification of data outputs, either by a user or automatically by the computer.
Display tailoring uci. Designing displays to meet the specific task needs of a user, rather than providing a general display which can be used for many purposes.
Display update uci. Regeneration of changed data to show current status, by user request or automatically by the computer.
Duty acq. See "Task analysis."
Effective temperature gen. An empirically determined index which combines into a single value the effect of temperature, humidity, and air movement on the sensation of warmth or cold felt by the human body. The numerical value is that of the temperature of still, saturated air which would induce an identical sensation.
Eight-hour time-weighted average sound level (TWA) snv. A measurement of the employee's workday noise environment. The TWA is that constant noise level, in dBA, slow response, which may cause hearing loss in 8 hours to the same extent as the exposure to the actual workday noise. The workday noise environment may or may not last for 8-hours, but the TWA is always computed as if the TWA level was present for an 8-hour work shift. Implicit in the TWA is a stipulated exchange rate between sound level and doubling of exposure time.
Q
TWA = log102 log10
T
1 2L(t)/Q dt
8
0
where: T =total workshift time in hours t = varying time
L(t) =the time varying A-weighted sound pressure level
Q = exchange rate, normally 3 dB.
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