论统计工作在高校人事管理中的作用

本文首先阐述了统计工作在高校人事管理中的意义,然后剖析了当前高校人事管理工作中统计作用降低的原因,并从提高认识、提高工作人员素质、完善人事统计指标和加强人事统计信息化建设等方面,提出了相关对策和建议。     

Comparative analysis between operational weather prediction models and QuikSCAT wind data near the Galician coast

Wind measurements from SeaWinds scatterometer on the NASA QuikSCAT satellite and wind forecasts from two different operational numerical models provided by MeteoGalicia were compared for a 4-year period (2002–2005) in Galician coast environment. Available wind data buoy measurements were also used to complement the analysis. A statistical analysis based on mean errors, root mean square errors and complex correlation was performed from spatial, temporal and directional points of view.In the spatial comparison no significant differences between models and satellite were observed and the error magnitudes of the models are compatible with typical QuikSCAT errors. The suitability of satellite wind estimations for data assimilation in these models must be further investigated. Negative bias of models with respect to the satellite was also confirmed with buoy data, in such a way that models overestimation is smaller than the satellite one. Big errors in wind direction appear in southeasterly and southwesterly winds for both satellite and models, contributing to high RMSE values when compared to buoy data. These errors were mainly attributed to the effect of insufficient spatial resolution near shore.     

Methods of analysis for vehicle soak time data

Vehicle soak time, the duration of time a vehicle’s engine is at rest prior to being started, and its distribution function are important transportation activity data inputs for mobile emissions inventory estimation due to their impacts on vehicle start and evaporative emissions. This paper provides vehicle emission researchers with an overview of statistical analysis methods relevant to analyzing vehicle soak time data. Many of these methods are already in use in emissions research and have appeared in the literature. These methods are reviewed and further details regarding the implementation and interpretation of these methods are provided. Statistical methods relevant to the analysis of soak time data that have yet to appear in the emissions literature, including kernel density estimation and generalized linear models, are also introduced. Advantages and disadvantages of the methods are compared and theoretical justification is provided. Issues of correlated observations and censored data are discussed. General guidelines for the analysis of soak time data, such as stratification by start type and geographical region, are established. Finally, a subset of the statistical methods discussed is used to analyze the US Environmental Protection Agency’s 3-city data.     

一种基于领域知识的电机故障模糊预测模型

针对交流电机故障原因的复杂性,提出了一种基于领域知识的电机故障模糊推理与故障综合评判相结合的预测模型.从模型结构、规则库建立、模糊推理及综合评判等方面具体讨论了所提出电机故障预测模型的建立思路与方法,阐明了这种模型可以更好地提高电机故障预测的有效性.     

模糊推理系统的MATLAB仿真研究

本文对常用的模糊推理系统进行了阐述,介绍了一种在模糊控制系统设计中构建Takagi-Sugeno型模糊推理系统的方法,使用了MATLAB的模糊工具箱与Simulink工具进行了仿真,效果是令人满意的。     

基于神经网络/模糊逻辑系统的混合式特征提取器

特征提取是水声目标分类的关键环节之一，用以获取各类目标的一些可鉴别性特征。螺旋桨轴频、叶率和叶片数是目标的本质性、鉴别性特征，是分类的重要线索。本文提出了一个基于神经网络／模糊逻辑系统的混合式特征提取器，先利用侧抑制神经网络从目标辐射噪声的包络谱中提取线谱序列，再利用模糊逻辑系统从线谱序列中提取出螺旋桨轴频、叶率和叶片数。对目标数据的分析表明：该特征提取器能够为目标分类提取有效的鉴别性特征。     

840D车轮辐板孔裂纹扩展速率的统计分析

通过对现场调查获得的3 974个840D车轮辐板孔裂纹数据进行分析,表明不同辐板孔裂纹长度下的裂纹形成时间可以用双参数威布尔分布来描述,形状参数可以取为常值;在辐板孔内侧裂纹长度小于和等于35 mm时,平均裂纹扩展速率与裂纹长度成正比。给出了840D车轮辐板孔平均裂纹扩展速率的计算公式。得出当裂纹长度为5,10,15,20,25 mm时,平均裂纹扩展速率分别为4.4,8.8,13.3,17.7,22.1 mm.年-1。     

双体船阻力性能研究

本文根据１２艘双体船船模变化其片体间距所得到的静水阻力试验资料，运用统计分析方法，得到估算双体船阻力数学模型和相应的图谱。该图谱主要自变量控制空间为５．０≤Ｌ／１／２。     

基于统计推理的舰炮武器防空目标威胁评估模型

针对舰炮武器系统防空威胁评估的特点,建立了一种属性值为区间数且属性权重完全未知,指挥员对方案具有主观偏好的偏差最小化不确定多属性决策方法。利用隶属度函数,获得传感器对目标隶属度函数值的统计推断区间,构成区间数决策矩阵。综合考虑多传感器网络获取的目标属性值数据和指挥员基于经验的主观偏好信息,建立了偏差最小化的多属性决策方法。通过防空目标威胁估计实例说明了该方法的实用性和有效性。     

基于NoteExpress的文献计量统计分析应用——以2010-2012年《情报科学》刊载文献为例

以《情报科学》2010-2012年间发表的论文为数据源,探讨了利用文献管理软件Note Express在进行题录数据采集、使用文件夹信息统计功能、导出与导入等功能进行文献计量统计方面的应用,从而提供了新的文献计量统计方法。