psychophysiological functions confirm that a press round program change doesn`t
affect the heart rate and tremor. Thus, a change of the rolling program doesn`t cause
any tension emotions or maintenance level changes of the cardiovascular system of the
operators.
The impact of the sudden changes in characteristics of the activity methods
(rolling mill electric drive), the indicator of which is an increase in the heart rate, on
the psychophysiological functions is more pronounced. It confirms the leading role of
the activity methods as an ergonomic factor that affects on the functional state of the
operators. This is especially true for the Ukrainian rolling mills due to a greater (in
comparison with the Chinese mills) modernization of the activities nature of the chief
operators during the changes in the workplaces. First of all, these changes concern an
information aspect of the activities. A comparison of the algorithms complexity of the
operators` activities shows that the complexity of the activity algorithms of the
Ukrainian chief operators is 2.5 times more than the control algorithm variable of the
similar properties for the manipulator operators. A comparison of these indicators gives
the value of 1.5 for the Chinese mills. The subjective assessment of the cognitive
component of the operators` occupational loading, which was made by the chief rolling
mill operators in Ukraine, is on average 1.2 times higher than the assessment made by
the manipulator operators. The HR dynamics of the chief operators confirms the
reduction of the burden on the cardiovascular system while the performance of the
manipulator operator`s duties.
The dynamics of the mental functions leads to the conclusion about the greatest
stability of the attention resource allocation function and the short term memory one
during a shift. The execution time of the black and red table test in most cases tends to
decrease. We interpret this fact in the following way.
The most important psychical function for work remains to ensure the optimum
efficiency of the operator`s occupational activity, including due to the stress of the
other body function systems. As a result of the analysis of labor efficiency by the
criterion, which connects the productivity and energy consumption, all the examined
rolling mill operators from Ukraine and China have been conditionally divided into
three groups:
1) the most “successful” in the occupational activities;
2) the operators with an average “success”;
3) the “least successful” operators.
The psychological indicator values differentiated according to the professional
success of the chief operators are given in the Table 6.
It was found that the most “successful” operators had the highest social and labor
activity with a high index of satisfaction with their job. The operators from the third
group of professional success are characterized by low social and labor activity. They
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