A new 3-dimensional task analysis system was developed, which replaces conventional methods for task analysis in industries using stop watches or video cameras. An analytical software of it was developed and its measuring performance was evaluated.
The results can summarized as follow. (1) a receiver with capability of detecting vertical positions was developed, in addition to conventional receiver for horizontal direction, so that 3-dimensional measurement of postures such as standing or sitting on a chair is possible. (2) a system was constructed with which the heart rates or the Relative Metabolic Rates (RMR) can be measured in relation with 3-dimensional human behavior performance, and (3) collect task analysis data for the entire process from the beginning to the end of the job in relation to the work processes and layout of tools.

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In this study, the noisiness is measured by the method of subjects' adjustment at various degrees of modulation combined with some pairs of carrier and modulating frequencies. The results indicate that the increase of noisiness caused by the temporal effect, observed at condition where the total bandwidth did not exceed the critical bandwidth, is highly correlated to the ratio of peak and mean energy levels. However, the increase of noisiness caused by the temporal effect is almost independent of the used modulating frequencies (from 3.9 to 15.6Hz). For the increase of noisiness observed through decreasing adjustments, a good accommodation is shown by a psychoacoustical model including low-pass filter characterized by the fast rise and slow decay.

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