共查询到19条相似文献，搜索用时 687 毫秒
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文章考虑了一个单服务台多服务员排队系统。在得到其强逼近结果的前提下,我们将该系统的一些重要指标——队长过程和闲期过程的泛函重对数律的问题转化为一个反射布朗运动相关问题;利用已有的布朗运动重对数律的结果,得到了队长过程和闲期过程的泛函重对数律的极限值。 相似文献
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得到了二重随机序列{ξn,j;n,j≥1}随机和的重对数律,其中{ξn,j;n,j≥1}是相互独立的且对任意的正整数n,{ξn,j;j≥1}有相同分布. 相似文献
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三值m-序列的伪随机性 总被引：3，自引：0，他引：3
仿照二值ｍ序殊伪随机性质,讨论了多值ｍ序列的伪随机性质,以三值ｍ序列为例,给出了三值ｍ序列的三条性质：描述一个周期段中序列元出现频率的定量１;描述游程随机统计特性的定理２,描述自相关函数的定理３。 相似文献
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关于随机变量序列的几乎处处中心极限定理,已经被讨论的相当深入。但对于随机变量序列部分和乘积的几乎处处中心极限定理,只有独立同分布随机变量序列、同分布的φ-混合序列、同分布的强混合序列,这些随机变量序列部分和乘积的几乎处处中心极限定理被深入的研究过。本文主要讨论一下强混合鞅差序列部分和乘积的几乎处处中心极限定理。 相似文献
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一个正确的数学演绎证明的逻辑结构,就是一个逻辑定理;反之每一个逻辑定理反映了一个正确的数学演绎推理规则。本文重着介绍全称概括：A（x）←→xA（x）规则在数学分析中的应用及反证法的逻辑基础。 相似文献
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梁龙跃 《中国科学院研究生院学报》2014,(4)
设{X1(t1),t1≥0},…,{Xp(tp),tp≥0}是取值于瓗d上p个相互独立稳定分量过程,讨论乘积集∏pi=1Xi[0,1]上的占时测度的重对数律,并利用密度定理得到乘积集的确切Hausdorff测度.作为特例,给出了瓗d上p个相互独立的严格稳定过程图集乘积集的确切Hausdorff测度. 相似文献
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《Information processing & management》2023,60(3):103278
Predicting information cascade popularity is a fundamental problem in social networks. Capturing temporal attributes and cascade role information (e.g., cascade graphs and cascade sequences) is necessary for understanding the information cascade. Current methods rarely focus on unifying this information for popularity predictions, which prevents them from effectively modeling the full properties of cascades to achieve satisfactory prediction performances. In this paper, we propose an explicit Time embedding based Cascade Attention Network (TCAN) as a novel popularity prediction architecture for large-scale information networks. TCAN integrates temporal attributes (i.e., periodicity, linearity, and non-linear scaling) into node features via a general time embedding approach (TE), and then employs a cascade graph attention encoder (CGAT) and a cascade sequence attention encoder (CSAT) to fully learn the representation of cascade graphs and cascade sequences. We use two real-world datasets (i.e., Weibo and APS) with tens of thousands of cascade samples to validate our methods. Experimental results show that TCAN obtains mean logarithm squared errors of 2.007 and 1.201 and running times of 1.76 h and 0.15 h on both datasets, respectively. Furthermore, TCAN outperforms other representative baselines by 10.4%, 3.8%, and 10.4% in terms of MSLE, MAE, and R-squared on average while maintaining good interpretability. 相似文献
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我国期货市场与国际期货市场关联度分析与协整检验 总被引：17，自引：0，他引：17
本文以中国大连商品交易所数据为例,分析了中国期货市场与国际期货市场的接轨程度和关联度,表明中国期货市场已基本具备市场的有效性,并形成了价格自我约束机制。最后,给出了模型结果的政策启示与几点建议。 相似文献
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ＣＬＴＡＮＤＬＩＬＦＯＲＴＨＥＳｔＡＴＩＯＮＡＲＹＳＥＱＵＥＮＣＥＯＦＡＤＯＵＢＬＹＳＴＯＣＨＡＳＴＩＣＴＩＭＥＳＥＲＩＥＳＡＲ－ＭＡＭＯＤＥＬＣＬＴＡＮＤＬＩＬＦＯＲＴＨＥＳｔＡＴＩＯＮＡＲＹＳＥＱＵＥＮＣＥＯＦＡＤＯＵＢＬＹＳＴＯＣＨＡＳＴＩＣ￥... 相似文献
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企业内员工间知识互换的博弈分析 总被引：12，自引：0，他引：12
通过建立基于知识互补性假设的两人知识互换效用函数,运用无限次重复囚徒困境博弈模型,分析了企业内员工间知识互换的主要障碍和解决途径。研究表明,在无限次重复博弈中,如果对于不合作的制裁威胁是可信的且未来收益的贴现因子足够大,则有效的知识互换均衡是可以达到的。 相似文献
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石怡 《中国科学院研究生院学报》2001,(2)
基于离散对数问题给出了一类新型 (tj,t ,n)门限群签名方案 ,该类群签名方案与一般的群签名方案相比具有如下特点 :(1 )各签名者可具有不同的权力 ;(2 )可通过灵活设置参数得到满足不同应用需求的解决方案 .同时还对这类方案的安全性进行了安全论证 相似文献
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Ibrahim Kocabas 《Journal of The Franklin Institute》2011,348(7):1339-1362
The Laplace transformation technique has been widely applied to modeling of tracer transport in oil and geothermal reservoirs, and in groundwater aquifers. However, mathematical models of many flow and transport problems could only be obtained as Laplace space solutions, and hence, their computations had to involve a numerical inversion technique.In this work, we employ the iterated Laplace transformation technique to develop novel closed form solutions to the tracer transport models in heterogeneous media. Two types of configurations have been considered: tracer transport in single fracture located in low-permeability matrix and tracer transport in a double porosity medium consisting of flowing and dead-end pore systems. In addition, both linear and radial flow geometries have been considered for both configurations. Applications of iterated Laplace transform technique to these four types of models are presented as fundamental examples and their numerical results were used as benchmarking for the numerical inversion results from Stehfest and Dubner and Abate algorithms.As the technique is quite versatile, we expect that the method should gain widespread acceptance to develop solutions to a wide range of problems in flow and transport in porous media and improve the application of nonlinear regression technique to these solutions.This work has achieved four important objectives: first, two novel Laplace transform relations that are useful in tracer studies are presented. Second, the present work serves to verify/invalidate the results of numerical inversion algorithms. In addition, it provides better insight into tracer transport mechanisms. Finally, it serves as a powerful tool of design and interpretation of tracer tests. All four objectives are illustrated in this work. 相似文献
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本文提出了一个对原始签名人、代理签名人、接收人三方身份验证的代理签名方案。原始签名人、代理签名人和接收人构成了整个签名过程的三要素。一个整体性的代理签名安全机制应该满足原始签名人、代理签名人、接收人三方身份识别的需要。本方案基于离散对数困难问题和Schnorr方案以保证代理签名的安全性。 相似文献