摘要 :
Attention theory and parameter measurements of human ability to discriminate two sensory events successively and sensory channel uncertainty influence on reaction time
摘要 :
The project assessed the effectiveness of a prototype driver-alertness device that measures driver response time to a tone. In previous studies response time has been found to be a indicator of fatigue. Fatigue is often a contribu...
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The project assessed the effectiveness of a prototype driver-alertness device that measures driver response time to a tone. In previous studies response time has been found to be a indicator of fatigue. Fatigue is often a contributing factor to accidents, though the percentage varies greatly with the data base and the method of calculation. Results indicate that participants were most alert while listening to the radio and least alert with nothing. Of the two versions of the device, the greatest levels of alertness were associated with the random mode. A post-test survey led to several suggestions regarding the button, tone, device placement, and other aspects that might be used to improve the prototype.
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摘要 :
The study separately evaluated the effects of luminance contrast and chromaticity contrast for body-color brake lamps. One set of chromatically neutral lamps of varying lightness (from black to white) was tested, along with a set ...
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The study separately evaluated the effects of luminance contrast and chromaticity contrast for body-color brake lamps. One set of chromatically neutral lamps of varying lightness (from black to white) was tested, along with a set of chromatically varied lamps of equal lightness, and a conventional lamp. The lamps were run pair-wise in a dual-task paradigm where one task involved simple compensatory tracking, and the other task was to respond to the onset of either of the two brake lamps. reaction times were recorded. The primary findings are statistically significant effects of both luminance contrast and chromaticity contrast on reaction time to brake lamps. Neither of these effects is large; the difference between fastest and slowest mean reaction times was 33 msec. The effect of luminance contrast is such that lamps that are light in their off state yield slower reaction times. Performance with the lightest lamp in the study was slightly worse than performance with the conventional lamp. None of the chromatic lamps degraded performance relative to the conventional lamp. The pattern of responses to the chromatic lamps suggests that for all lamps that are different from red in their off state, the effect of chromaticity contrast will be to speed up reaction time slightly compared to the conventional lamp.
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摘要 :
We present a formal specification of primary-backup. We then prove lower boundson the degree of replication, failover time, and worst-case response time to client requests assuming different failure models. Finally, we outline pri...
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We present a formal specification of primary-backup. We then prove lower boundson the degree of replication, failover time, and worst-case response time to client requests assuming different failure models. Finally, we outline primary-backup protocols and indicate which of our lower bounds are tight.
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摘要 :
The objective of the study was to investigate the influence of stop lampintensity, area, and aspect ratio on reaction time. Recent trends in auto body styling have begun to incorporate center high-mounted stop lamps (CHMSLs) into ...
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The objective of the study was to investigate the influence of stop lampintensity, area, and aspect ratio on reaction time. Recent trends in auto body styling have begun to incorporate center high-mounted stop lamps (CHMSLs) into spoilers and trunk lids. These developments, brought on in part by technical advances in automotive lighting, have resulted in questions about the efficacy of stop lamps whose effective luminous area is long and narrow. Subjects in the study were asked to perform a computer-based tracking task to control their eye fixations, and to provide the approximate cognitive loading associated with driving, while responding to the onset of stop lamps of varying characteristics. The results of this laboratory study indicate that aspect ratio and intensity of stop lamps, as well as their interaction, influence reaction time. Specifically, subject reaction times to the onset of simulated stop lamps were longer when the stimulus intensity was low and the aspect ratio was large.
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