Abstract
The work recorded in this paper is a continuation of the study of previous report. The general principle of preceding paper was applied to cases with rush hour, seasonable fluctuation and upper trend of demand. As a result of study, it was proved that a simple formula was reduced on these cases in the same manner to the case with stochastic fluctuation of demand. The formula shows that the optimum scale of facilities is such a scale that ratio of cost and profit per unit scale, or ratio of cost and loss per unit scale is equal to the ratio of overflowing time. This ratio is concerned with the mean waiting time on the model with queueing, which we can graphically calculate without difficulty. The second part of this report is the case study of the type of facilities in wich number of users has upper trend of demand. The result obtained from application of our general principle indicates that the optimum stage of the demand which should be object of planning has no relations with the time series pattern of demand. In usualy cases, it seems that the optimum stage of demand is that of a few years late, even when life of the facilities is considerably long. This is the effect of interest of invested capital. Accordingly, it is concluded that the optimum scale of building facilities is determined by ratio of cost and profit or cost and loss per unit scale.
