Sang Dae Choi
Doctor of Philosophy
and Manufacturing Engineering
Title: Psychophysically Derived Work Frequencies Associated
With Roof Shingling Operations Involving Change in Grade
Dr. Tycho Fredericks, Chair
Dr. Steven Butt
Dr. Colleen Phillips
Dr. Osama Abudayyeh
August 13, 2003 10:00 a.m.-12:00 a.m.
The objective of this study was to investigate the effect
of roof shingling period and slope on psychophysical roof shingling
frequency. Twelve healthy males (21-30 years old) were used as participants.
Experiment one was designed to determine Maximum Acceptable Roof Shingling
Frequency (MARSF) for a workday period using psychophysical methodology.
Results indicate that 198 shingles/hr was an acceptable roof shingling
frequency for a workday. Furthermore, 2 hours is an acceptable testing
period (equivalent to the workday). Postural sway and physiological
variables support these findings. Experiment two was designed to study
the effect of slope (18°, 26°, and 34°) on MARSF. Experiment
two indicates that slope had a significant effect on MARSF, postural
sway, trunk motion, and subjective variables. MARSF decreased with an
increase of slope by 5.3% from 18°to 26°, while the shingling
frequency decreased by 13.9% from 26°to 34°. Regression models
were created to aid in predicting MARSF. These results will prove not
only to be useful for practical applications in the roofing construction
but also academic applications for ergonomics/safety researchers who
have a capacity of research experiments in order to validate the models
as well as explore for a further finding.
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