Inventory control for nonstationary demand based on dynamic lot-sizing;

For nonstationary demand, traditional stationary policies will lead to stockouts with unsatisfied demands or to larger inventories being carried than planned.

In a two-echelon supply chain system with one retailer and one manufacturer,the mathematical model of sharing the information of retailers future promotion plans and real time marketing demands is constructed when the marketing demand is closely related to the retailer s promoting activities as well as the normal random distribution with varied means,that is called unstable marketing demands.

Because forest s ecological functions are becoming increasingly prominent in aspects of maintaining ecological balance, protecting biodiversity, preventing water-soil loss, checking winds and fixing sand, decreasing environment pollution, satisfying people s health and spirit, "Ecological requirement" to forest is exceeding "economic requirement" in China.