1996-1997

为了开发多阶段生产系统的敏捷订货系统，本研究提出了一种缓冲库存水平的反应控制器，以应对需求的不稳定变化。在控制器中，检测需求的不稳定变化，并确定缓冲库存的最佳水平作为对变化的反应。除了控制器之外，本研究也提出看板系统与同时订购系统之间的切换。在该系统中，需求的时间序列数据进行监测，并考虑切换订单释放系统和控制缓冲库存水平时，检测到的不稳定变化的需求。通过仿真实验验证了该系统的有效性。仿真结果表明，所提出的控制器能够在满足产品需求平均等待时间要求的前提下，对不稳定变化做出反应，并且在不控制缓冲库存水平的情况下，使系统平均在制品库存减少了约77%。此外，为了满足所需的水平，所提出的系统，切换订购系统和控制的缓冲库存水平降低了平均在制品库存比没有切换订购系统的系统。

In order to develp an agile ordering system for multi-stage production system, this research proposed a reactive controller of buffer inventory level for reacting to the unstable changes in demand. In the controller, the unstable changes in demand are detected, and the optimal level of buffer inventory is determined as a reaction to the changes. In addition to the controller, switching between the Kanban system and the concurrent ordering system is also proposed in this research. In the proposed system, the time series data of demand is monitored, and switching the order release systems and controlling the buffer inventory level are considered when the unstable change in demand is detected. The effectiveness of the proposed system is clarified by simulation experiments. As a result of simulation experiments, it is clarified that the proposed controller can react to the unstable changes indemand with satisfying the required level for the mean waiting time of product demand, and the proposed controller reduces as much as about 77% of the mean work-in-process inventories of the system without controlling the buffer inventory level. Also, for satisfying the required level, the proposed system which switches the ordering systems and controls the buffer inventory level reduces the mean work-in-process inventories much more than the system without switching ordering systems.