求翻译：物流仓储是现代物流的库存控制中心，库存成本是物流主要成本之一，约占总物流成本的三分之一。因此控制库存成本，对库存进行优化就成为了物流仓储在物流供应链框架下降低总成本的主要任务。基于以上背景，本文对物流仓储中的库存控制进行了研究，建立了多级库存模型，通过模型分析，使用遗传算法，实现了供应链环境下的多级库存优化；并进行仿真分析，验证算法的有效性。本文主要研究内容如下：是什么意思？

Logistics and warehousing inventory control is a modern logistics center, logistics and inventory costs is one of the major costs, accounting for about one-third of the total logistics costs. Therefore, control inventory costs, inventory optimization has become a logistics and warehousing in the log

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Logistics warehousing inventory control center is a modern logistics, inventory cost is one of the logistics costs, accounted for about one-third of the total logistics costs. Control inventory costs, for inventory optimization becomes a logistics warehouse in the logistics supply chain framework lo

Logistics and warehousing inventory control is a modern logistics center, logistics and inventory costs is one of the major costs, accounting for about one-third of the total logistics costs. Therefore, control inventory costs, inventory optimization has become a logistics and warehousing in the log