For the ergodic control problem, a dynamical programming equation is established based on the stochastic dynamical programming principle and solved to yield the optimal control law.

然后基于动态规划原理建立系统的动态规划方程，求解动态规划方程得到系统的最优控制策略。

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Rhizome is the stock part of ginger in production. How to decide the size of seed-rhizome in production is a problem imperatively needed to solve in order to gain the optimal yield and benefit.

生姜利用种块繁殖，用种量大，前期投入高，如何合理确定用种量，以获得最佳产量与效益，是当前生姜生产中亟待解决的问题。

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