Objective To investigate the image character and diagnosis and differential diagnosis of benign tumors in parotid space.

目的探讨腮腺间隙常见良性肿瘤的影像特征及其诊断与鉴别诊断。

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With the theory of stochastic differential equation, the authors discuss a problem of a class of risk investment portfolio with stochastic character.

利用随机微分方程理论，对一类具有随机特征的风险投资组合问题进行深入研究。

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The main methods of face tracking were introduced, and a new method based on both inter-frame differential and static character was put forward.

简述了近年来主要的人脸跟踪方法，提出一种基于帧间差分与静态特征相结合的人脸跟踪算法。

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