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讨论了格上可测结构的封闭性以及此结构上落影函数的有关问题。指出并证明了逐次扩张与同时扩张的充要条件 ,以及落影函数与模糊集的关系 相似文献
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基于随机集合的非传统型有效波极值模型 总被引:1,自引:0,他引:1
The analysis and design of offshore structures necessitates the consideration of wave loads. Realistic modeling of wave loads is particularly important to ensure reliable performance of these structures. Among the available methods for the modeling of the extreme significant wave height on a statistical basis, the peak over threshold method has attracted most attention. This method employs Poisson process to character- ize time-varying properties in the parameters of an extreme value distribution. In this paper, the peak over threshold method is reviewed and extended to account for subjectivity in the modeling. The freedom in selecting the threshold and the time span to separate extremes from the original time series data is incorpo- rated as imprecision in the model. This leads to an extension from random variables to random sets in the probabilistic model for the extreme significant wave height. The extended model is also applied to different periods of the sampled data to evaluate the significance of the climatic conditions on the uncertainties of the parameters. 相似文献
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卢同善 《中国海洋大学学报(自然科学版)》1987,(2)
随机不动点定理在随机泛函分析中起重要作用。最近,随机集值映射的不动点定理得到了广泛地研究。本文研究具有随机定义域的随机集值映射的一个新的不动点定理,这一定理推广了S.Reich等人的重要结果。 相似文献
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卢同善 《山东海洋学院学报》1987,17(2):109-114
随机不动点定理在随机泛函分析中起重要作用。最近,随机集值映射的不动点定理得到了广泛地研究。本文研究具有随机定义域的随机集值映射的一个新的不动点定理,这一定理推广了S.Reich等人的重要结果。 相似文献
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