四链模型
四链模型-
对基于简单立方格子的单单元模型进行了适当改进，再现了非整数周期螺旋；并在此基础上提出了四单元格子链模型。
The single-unit model has been improved in the simple cubic lattice space , resulting in α - helix structure with non-integer period ; and the four-unit lattice model has also been constructed .
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通过改善Ricardo模型，在供应链层次上建立四种供应链结构模型，利用各节点的成本和客户服务水平指标来衡量其性能。
Based on the improvements of Ricardo model , a new model about four supply chain structures was set up on the supply-chain-level and then was evaluated by the criteria of cost and customer service .