确定管道流变应力的不确定性分布是对含缺陷压力管道进行可靠性评定的前提。
For assessing reliability of a pressure piping containing defects, it is necessary to know the calculation method and the distributions of flow stress of material.
在分析R&D项目技术和市场不确定性分布特征的基础上，提出多步骤四项式期权定价模型，用于R&D项目进展评估。
Besed on the analysis of technology and market uncertainty of R&D project, a multi-step quadranomial option pricing model is presented for valuing an ongoing R&D project.
当概率分布未知时，就存在不确定性。
Uncertainty occurs when the probability distribution is unknown.
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