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次线性期望空间下精确渐近性的一般定律
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作者 黄丽桢 吴群英 《应用数学》 北大核心 2023年第4期845-858,共14页
假设{X_(n);n≥1}是次线性期望空间(Ω,H,ê)上的独立同分布随机变量序列.本文在CV(X^(2))<∞和limc→∞ê(X^((c)))=limc→∞ê(-X^((c)))=0以及某类慢变化函数h(x)的条件下,将概率空间中的独立同分布随机变量加权和的... 假设{X_(n);n≥1}是次线性期望空间(Ω,H,ê)上的独立同分布随机变量序列.本文在CV(X^(2))<∞和limc→∞ê(X^((c)))=limc→∞ê(-X^((c)))=0以及某类慢变化函数h(x)的条件下,将概率空间中的独立同分布随机变量加权和的一般式精确渐近性推广到次线性期望空间,获得了两个精确渐近性的一般定律,同时研究其必要性. 展开更多
关键词 次线性期望 加权函数 边界函数 精确渐近性 一般定律
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Graph-Theoretic Approach to Network Analysis
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作者 Nabil Hassan 《Computer Technology and Application》 2013年第12期625-634,共10页
Networks are a class of general systems represented by becomes a weighted graph visualizing the constraints imposed their UC-structure. Suppressing the nature of elements the network by interconnections rather than th... Networks are a class of general systems represented by becomes a weighted graph visualizing the constraints imposed their UC-structure. Suppressing the nature of elements the network by interconnections rather than the elements themselves. These constraints follow generalized Kirchhoff's laws derived from physical constraints. Once we have a graph; then the working environment becomes the graph-theory. An algorithm derived from graph theory is developed within the paper in order to analyze general networks. The algorithm is based on computing all the spanning trees in the graph G with an associated weight. This weight is the product ofadmittance's of the edges forming the spanning tree. In the first phase this algorithm computes a depth first spanning tree together with its cotree. Both are used as parents for controlled generation of off-springs. The control is represented in selecting the off-springs that were not generated previously. While the generation of off-springs, is based on replacement of one or more tree edges by cycle edges corresponding to cotree edges. The algorithm can generate a frequency domain analysis of the network. 展开更多
关键词 UC-structure NETWORK spanning tree depth-first search spanning trees generation algorithm.
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