提出了基于直接螺旋半扫描数据的有序子集期望最大化（OSEM）迭代重建。

This paper proposed a modified ordered subsets expectation maximization(OSEM) reconstruction based on the direct helical half-scan data.

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文章建立了基于数量折扣策略且能最大化供应商期望利润的信息甄别模型，分析了模型解的性质，给出了求解方法。

We formulate a screening model to maximize supplier's profit, then analyze the properties of the model and put forward the solution procedures.

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本文将时频掩蔽效应引入盲源分离语音增强系统中，给出一种基于时频掩蔽效应和盲源分离的语音增强方法，并将其与期望最大化方法进行了性能比较。

To obtain clearer desired signal under multi-speaker environment, the time-frequency masking effect is used in post-processing of speech enhancement using blind source separation.

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