Study on a creation of supply chain management based on the JIT principle

现在的个人电脑的性能已经超越了老一代的超级计算机，互联网等网络技术也在飞速发展。信息技术（IT）的这场革命极大地降低了信息成本，并且现在可以很容易地收集和利用公司范围或世界范围的信息，例如生产点（POP）和销售点（POS）的信息。在这种情况下，我们发展了之前关于准时制（JIT）生产系统演变的研究，试图建立一个基于JIT原则的供应链管理（SCM）。这充分利用了信息技术，通过在公司之间、跨国公司之间共享零部件和原材料采购、生产、分销和销售等所有流程的信息，以达到整体优化的目的。以下四点是通过本研究得出的结果。为了解决大规模问题，我们改进了前人研究的神经动态规划（DP）算法SBMPIM。通过模拟对参数进行优化调整的拉动式生产系统，如看板、基础库存、CONWIP、混合看板和广义看板系统，单位时间的预期总成本与上述SBMPIM计算的单位时间的预期总成本进行了数值比较。其次，我们考虑好的拉动系统的控制规律是否可以应用到基于JIT原理的供应链管理中，并利用rfid技术将其应用到基于JIT原理的供应链管理中。对混件装配线和u型线进行了理论分析，并提出了其生产线的优化算法。我们对东海地区的汽车制造公司进行了外包调查，并澄清了其与制造业领导者的关系以及影响这些公司引入RFID的因素。

The current personal computers surpass the performance of the older generation supercomputers and the network technology including Internet is progressing rapidly. This revolution of Information Technology (IT) dramatically reduces the information cost and the company-wide or world-wide information such as information at the Point Of Production (POP) and at the Point Of Sale (POS) now can be easily collected and utilized. In these circumstances, we develop our previous studies on the evolution of Just In Time (JIT) production system to attempt to create a Supply Chain Management (SCM) based on the JIT principle. This utilizes IT fully by sharing of information between companies, corporations across the border concerning all processes such as parts and raw materials procurement, production, distribution and sales to reach customers, and aims to attain an overall optimization. The following four points are the results obtained through this study.1. We improve the neuro Dynamic Programming (DP) algorithm SBMPIM developed already in our previous studies to solve the large-scale problems.2. The expected total costs per unit time of pull production systems, whose parameters are optimally adjusted by simulation, such as the Kanban, Base stock, CONWIP, Hybrid and Generalized kanban systems are numerically compared with the expected total costs per unit time computed by the SBMPIM mentioned above. Next, we consider whether the control laws of good pull systems can be applied to the SCM based on the JIT principle and apply them to the SCM based on the JIT principle by using the RFID.3. Mixed-item assembly lines and U-shaped lines are analyzed theoretically and optimization algorithms of their production lines are developed.4. We did the survey of outsourcing for Tokai region's automotive manufacturing companies and clarify its relationship with manufacturing leaders and factors affecting the introduction of RFID to those companies.