“…To find a solution, HCS use models considering resource as a whole. The control uses model of buffer set (Labinaz et al, 1996, 1997; Ushio et al, 1995), which is a complex, rigid, and difficult-to-change model. Thus, if a buffer is added, the system model should be changed to reconfigure the control, feature which shows the rigidity of the conventional system.…”