用英语解释：整体物流概念、综合物流、DPP、MRP、JIT、logistics planning

Material Requirements Planning (MRP) is a software based production planning and inventory control system used to manage manufacturing processes. Although it is not common nowadays, it is possible to conduct MRP by hand as well.
An MRP system is intended to simultaneously meet 3 objectives:
Ensure materials and products are available for production and delivery to customers.
Maintain the lowest possible level of inventory.
Plan manufacturing activities, delivery schedules and purchasing activities.

In computing, just-in-time compilation (JIT), also known as dynamic translation, is a technique for improving the performance of bytecode-compiled programming systems, by translating bytecode into native machine code at runtime. The performance improvement originates from pre-translating the entire file, and not each line separately (see Interpreted Language). JIT builds upon two earlier ideas in run-time environments: bytecode compilation and dynamic com