根据正交切削特点建立了有限元模型，应用弹塑性力学讨论了切削变形区的弹、塑性阶段的应力、应变状态。
Establish finite element model, and use elastic - plastic mechanics to discuss stress-stain state of elastic and plastic deformation in cutting zone.
用有限元法做弹性波正演模型计算已进入实用阶段，但有限元法所要求的大存储量和计算速度慢的缺点依然存在。
Finite element method las been practically applied to the forward modeling of elastic wave. But its shortcomings, such as large storage needed and slow calculation, remain.
建立了马氏决策过程模型，首先对有限阶段问题进行了研究，得到了其最优策略。
By using of Markov Decision Process, the finite horizon inventory, pricing and capacity expansion problem is discussed, and the optimal strategy of which is obtained.
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