在使用水平仪对平行度误差进行测量及评定时，目前一直沿用着用手工按图解法或计算法进行数据处理。
In measuring and evaluating the parallelism error with the leveler, data processing is conventionally carried out by manually graphic and calculation methods according to the data measured.
通过马尔可夫分析，构造了求解系统处于平稳状态概率的迭代算法，提出了计算订单的平均缺货水平的近似表达式。
Based on Markov analysis, this paper presents a recursive algorithm to compute probabilities under stable states and derives the approximate expression for order-based backorders.
在数学分析的基础上，通过对上述算法的水平集计算过程的优化，提出了一种计算简单的约束控制算法。
Based on the mathematic analysis, the algorithm with simple computations was proposed by optimizing the computation of the level sets.
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