Abstract
The Electrical Section of the Ehime Plant, Toyo Rayon Co., Ltd. uses key-sort punched cards in maintenance work. These cards also furnish information for the plants' preventive maintenance (PM) schedules. Applying the queuing theory obtained from communication engineering to these data, the author derived theoretically the optimum number of three-shift workers belonging to each division and investigated the job assignments of each division.Furthermore, we have conducted a simulation study by the Monte Carlo method and found the result very close to the value obtained by the above-mentioned theory. We have concluded, therefore, that, roughly speaking, the above-mentioned theoretical values are useful in practice. Through the same theory, the author concluded that better field services are obtainable if the maintenance crews are combined in one group rather than divided into several local groups; and that fewer workers will do if the amount of service is uniform.We investigated how many reserve hands were needed to allow for absenteeism when formerly three divisions of the Electrical Section were combined into one group. We put the results of the investigation into practice and obtained a major saving in labor.
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