Stephen M Popkin

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The apparent connection between sleep debt, performance decrements and workplace accidents has generated a need for feasible vigilance tests that focus on the quantification of daytime sleepiness in occupational settings. The objective of this study was to evaluate the sensitivity of the Maintenance of Wakefulness Test (MWT) to acute sleep deprivation of(More)
  • P E Yu, Robert E Gallamore, Stephen A Keppler, Henry M Lees, Jr Burlington, Northern Santa +6 others
  • 2012
The TRB currently manages the following three IDEA programs: • NCHRP IDEA Program, which focuses on advances in the design, construction, and maintenance of highway systems, is funded by American Association of State Highway and Transportation Officials (AASHTO) as part of the National Cooperative Highway Research Program (NCHRP). • The Safety IDEA Program(More)
Actual working hours of employees vary widely, especially in the transportation industry. We developed a tool, the RAS (Representation and Analysis Software), to ease the assessment of such irregular hours and the transfer of existing knowledge of proper schedule design to the problem of irregular hours. This article discusses several critical design(More)
  • Thomas A Dingus, Virginia, Brad Kerchof, Norfolk Southern Railway, Henry M Lees, Jr Burlington +6 others
  • 2013
The TRB currently manages the following three IDEA programs: • NCHRP IDEA Program, which focuses on advances in the design, construction, and maintenance of highway systems, is funded by American Association of State Highway and Transportation Officials (AASHTO) as part of the National Cooperative Highway Research Program (NCHRP). • The Safety IDEA Program(More)
  • John R Njord, Vice Chair, Michael D Meyer, Michael Walton, Ernest H Cockrell, Robert E Skinner +42 others
  • 2006
resources of the entire scientific and technical communities to bear on national problems through its volunteer advisory committees. The Transportation Research Board is distributing this Circular to make the information contained herein available for use by individual practitioners in state and local transportation agencies, researchers in academic(More)
Few studies have examined napping in irregular work schedules such as those experienced by freight locomotive engineers. The current study examined the effect of napping in irregular work schedules on sleep length and three subjective measures: ability to go to sleep, ability to stay asleep, and a feeling of being well-rested upon awakening. One hundred and(More)
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