Candidate: Sang Dae Choi

Degree of: Doctor of Philosophy

Department: Industrial and Manufacturing Engineering

Title: Psychophysically Derived Work Frequencies Associated With Roof Shingling Operations Involving Change in Grade

Committee:
Dr. Tycho Fredericks, Chair
Dr. Steven Butt
Dr. Colleen Phillips
Dr. Osama Abudayyeh

Date: Wednesday August 13, 2003 10:00 a.m.-12:00 a.m.
Parkview C-258

Abstract:
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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