Confidence intervals for dependent data: Equating non-overlap with statistical significance

We revisit the problem of determining confidence interval widths for the comparison of means. For the independent two-sample (two-sided) case, Goldstein and Healy (1995) draw attention to the fact that comparisons based on 95% error bars are not very effective in assessing the statistical significance of the difference in means and derive the correct confidence interval for such a comparison. We provide an extension to Goldstein and Healy (1995) to account for the correlation structure and unequal variances. We use the results to develop rules of thumb for evaluating differences, in an exploratory manner, like Moses (1987) and Cumming (2009), from the independent case. We illustrate the method for the simple comparison of two means in a real data set, provide R code that may be easily implemented in practice, and discuss the extension of the method to other applied problems.     

k-best MIRA和动态k-best MIRA

MIRA(Margin Infused Relaxed Algorithm)是一种超保守算法,在分类、排序、回归等应用领域都取得不错成绩.文中在传统MIRA算法基础上进行改进,提出k-best MIRA(K-MIRA)与动态k-best MIRA(DK-MIRA)算法.这两种算法能够根据学习进程自动调整优化约束条件,从而提高算法的收敛速度与性能.将K-MIRA与DK-MIRA用于定义类问题回答中的句子排序任务,取得较为满意的实验结果.     

利用回路电流和节点电压混合分析法快速构造电压稳定域

应用回路电流和节点电压混合分析法对π型基本回路模型进行了分析,给出了一种利用节点注入功率和网络参数快速构造基于状态空间的电压稳定域的方法.提出了一种新型快速计算电压稳定裕度的指标,该指标以负荷节点注入电流幅值的平方与节点无功功率之间的差值来表征电压稳定裕度.最后将所提出的方法应用于IEEE 30节点系统和IEEE118节点系统,并与已有算法进行了比较,验证了该方法的可行性.     

基于边际效应的备件保障概率库存优化模型

分析及时送修策略下的备件保障过程的特点,总结备件保障概率的函数模型,构建以费用为约束的系统级备件保障概率目标函数,并进行特性分析。然后基于边际效应方法描述备件库存优化流程,并修正各产品初始备件量值,以符合模型边界条件。最后通过具体案例的应用,对模型进行进一步的说明和检验。     

2.25Cr-1Mo材料在拉伸过程中的声发射信号聚类分析

声发射(AE)技术能用来区分发生在受载材料内的不同损伤模式,而聚类分析能在无先验知识的情况下通过揭示数据内部结构对数据进行分类。声发射波形包含了丰富的声发射源信息,而常规的特征参数并不能满足深层次的声源识别要求。文章尝试从波形的频率分布特征、形状特征和强度特征三个方面分别选取小波变换能量特征系数、波形裕度因子和幅值作为描述声发射波形的新参数。基于波形新参数的聚类分析能有效地区分加氢反应器材料2.25Cr-1Mo带裂纹和无裂纹试件拉伸过程中屈服阶段塑性变形信号、微裂纹扩展信号和断裂失稳信号。     

H145-03FL增压器主要故障分析及对策

分析H145-03FL增压器主要故障喘振？异响、漏油发生的原因,并且针对每种原因提出了判断及处理方法,供相关人员借鉴。     

转子动平衡的几个优化算法

介绍了影响系数法，影响系数余量法，定相位角最佳算法，单平面加重的优化搜索法及优化影响系数法等转子动平衡的计算方法及其各算法的MATLAB应用程序。实际的算例验证了各程序的正确性与有效性，证明了通过计算得到的多种配重方案可给平衡工作提供更多的选择空间，有利于提高平衡工作的质量、效率和降低成本。     

变动成本法与全额成本法的区别初探

美国等一些西方国家的企业在成本核算上,通常采用对内对外两套核算方法,即对内采用变动成本法,对外采用全额成本法.由于原有经济体制及人力、物力和财力等原因,我国的企业一般只采用全额成本法进行成本核算和对外报告,如何使变动成本法在市场经济体制下走进企业,为企业的成本概算,经营决策等服务,是急待解决的问题。本文从两种方法的对比分析中,找出适合我国企业应用变动成本法的条件及应用的一些具体设想.     

Designing spectral sensitivity curves for use with Artificial Color

Artificial Color uses data from two or more spectrally overlapping sensitivity curves to assign class membership to pixels and ultimately to images. The usefulness of Artificial Color for various scene segmentation tasks has been shown in several recent papers, but those demonstrations all used sensitivity curves not optimized for the particular task, i.e. the R, G, B filters of commercial color cameras. This paper explores means to evolve suitable spectral sensitivity curves suited to any specialized task and illustrates that method with synthetic data chosen to be very hard to discriminate spectrally. Two special cases are illustrated. In one, a single Gaussian curve is used for a dichroic beamsplitter, so that the curve and its complement are used for discrimination. In the other case, two essentially orthogonal curves are utilized for the same task. The single Gaussian curve leads to poorer discrimination but better light efficiency relative to the two curves. Both do quite well on the difficult target problem.     

纸盘拼接的直径检测方法与应用

在对PROTOS2 VE/SE2卷烟机纸盘变直径检测研究的基础上,建立脉冲检测、干扰处理和速度修正模型.通过脉冲检测,计算变直径纸盘脉冲,从而得到旋转中的纸盘直径,对纸盘残余量实施控制.