“…N is a dependent variable, and changes with time and other factors (X) such as place and weather. This variable (N) is complex, and many studies have been conducted regarding the distribution and change in the number of people (Aubrecht et al, 2009(Aubrecht et al, , 2010a. v is the dependent variable of the function, and is affected by the features of the structure, such as the number of stairs, corridor width, stair width, pedestrians in the corridor, and the strength of the stairs.…”