圆柱体岩块变角板试验结果分析

将圆柱体岩石试件放在一对自制的半圆形钢制卡环内，进行变角板试验，并将其结果与标准正方体试件的试验结果进行比较，发现两种不同形状岩样的内聚力ｃ值及内摩擦角ψ值比较接近，且圆柱体试件试验所得剪应力τ与正应力σ之间的相关系数大于０．９６，破坏面理想，破裂体两半基本对称，故圆柱体试件变角板试验结果具有一定的可靠程度。     

Identifying Volatility Clusters Using the PPM: A Sensitivity Analysis

Several previous works show that, in general, financial time series are characterized by periods of large volatility followed by periods of relative quitness. In this paper we consider the product partition model (PPM) to identify changes in the volatility extending it to identify multiple change points in normal variances assuming known means. Yao’s prior cohesions and a conjugate prior distribution for the variance – which in this case is a Inverted-Gamma distribution – are assumed. The ultimate goal is to provide a sensitivity analysis to the product estimates assuming different prior specifications for the parameter which indexes the Yao’s cohesions and also for the variance. We analyze a Chilean stock market return series and conclude that the product estimates for the volatility of this series are strongly influenced by the prior specifications of both parameters.     

汉英篇章衔接对齐语料库构建研究

篇章衔接性分析是理解篇章的基础,汉语和英语在指代、连接和省略等主要衔接方式上存在差异。该文分别给出子句、连接词、指代和省略的汉英篇章衔接对齐标注策略,创建了规模为200个对齐文档的语料库资源,对标注语料进行质量评估并讨论了标注中的难点问题及解决方法。语料库中的子句、连接词和指代标注一致率分别为0.909、0.876和0.920。在该文构建的语料库上分别进行子句切分和连接词识别实验,结果表明,该文语料标注策略切实可行,标注质量满足实际需要。     

面向对象软件中类内聚度度量分析与研究*

对现有著名的类内聚度度量进行了较深入的分析,指出了各自存在的缺陷与不足,并在此基础上考虑到类内聚度受到类内有可能与外界组件产生耦合的成员的负面影响,提出了对CCM(C)再次修正后的MCCM2(C).