一种新的基于UMVE和OS的恒虚警检测算法

为了充分利用参考单元所提供的信息,减少恒虚警损失,该文基于无偏最小方差估计(UMVE)方法和有序统计(OS)方法,提出了一种新的恒虚警检测器(MOSUM-CFAR)。它的前沿和后沿滑窗分别采用UMVE和OS方法产生两个局部估计,再对二者求和得到背景功率水平估计。在Swerling II型目标假设下,文中推导出MOSUM-CFAR在均匀背景下虚警概率Pfa和检测概率Pd及多目标环境下检测概率Pd的解析表达式,并与其它方案作了比较。分析结果表明MOSUM-CFAR在均匀背景和多目标环境下均具有相当好的检测性能。     

一种嵌入式颗粒显微图像统计系统的设计与实现

为了对颗粒显微图像进行有效地统计与识别,设计了一种以DSP为核心的嵌入式图像采集处理系统.模拟视频信号由视频A/D转换为数字图像,DSP首先利用中值滤波、自适应阈值分割等算法对图像进行预处理,将目标从背景中分离出来,然后采用扫描标记的算法对目标区域加以标记,最后实现对颗粒的数目及面积等几何尺寸的统计.实验结果表明,系统不仅能够对颗粒进行全面、客观地统计分析,而且简单、方便,具有重要的实用价值.     

Video object segmentation by 2-D mesh-based motion analysis

Video object extraction is a key technology in content-based video coding.A novel video object extracting algorithm by two Dimensional (2-D) mesh-based motion analysis is proposed in this paper.Firstly,a 2-D mesh fitting the original frame image is obtained via feature detection algorithm. Then,higher order statistics motion analysis is applied on the 2-D mesh representation to get an initial motion detection mask.After post-processing,the final segmenting mask is quickly obtained.And hence the video object is effectively extracted.Experimental results show that the proposed algorithm combines the merits of mesh-based segmenting algorithms and pixel-based segmenting algorithms,and hereby achieves satisfactory subjective and objective performance while dramatically increasing the segmenting speed.     

静态磨损试验数据的数理统计分析

介绍了用数理统计方法分析处理静态磨损试验数据的方法,表明用数理统计方法分析处理磨损试验数据可避免对试验结果作出错误判断. 更多还原     

The influence of mining factors on seismic activity during longwall mining of a coal seam

In this article an attempt to determine the influence of mining factors on the seismic activity during the longwall mining of the upper layer of coal seam no. 405/2 in one of the Polish hard coal mines in the Upper Silesian Coal Basin was conducted. Two longwall panels were mined in analogous geological conditions and based on the same mining system and technology. However, there was significant difference with regards to the mining factors, which was reflected in the observed seismic activity. Some tools used in mining seismology were applied to illustrate the aforementioned influence of mining factors, e.g. the frequency-energy distribution, the frequency-magnitude distribution, the 2 D distribution of released seismic energy, the relationship between released seismic energy and the volume of mined coal, the Benioff strain release, and the Gutenberg-Richter(GR) b coefficient distribution(b is the proportion between high and low energy tremors). Concerning the Benioff strain release, a new solution, based on the slope of a fitted line in a moving time window, is proposed.     

运用数理统计方法提高循环水质量控制能力

介绍了对循环水质量控制的必要性和直方图法、过程能力计算等数理统计方法。绘制了直方图,并计算过程能力指数,对循环水质量控制水平作出评价。通过实际应用控制图,有效地提高循环水质量控制能力。     

基于Web的体育统计网络教学平台的设计与实现

基于Web的体育统计网络教学平台是开展网络化学习的基础,它为教师和学生提供了一个学习和工作的网络环境。设计并实现了一个包括网络课程、学科动态、自我测试、联机作业、答疑解惑、资源共享、趣味统计、学习论坛等功能的多媒体网络教学平台,为用户提供个性化的教学服务。全面详细地介绍了该平台的设计原则、系统结构、系统功能和特点。     

大批量定制下供应链节点企业间的订单处理过程

在大批量定制环境分析和订单驱动原理基础上,针对订单处理特征,提出批量生产与定制生产在时间和空间上的两结合方式,并根据订单处理分离点的推移,分别对按订单销售、设计、制造、装配和采购的供应链节点间生产方式和订单处理流程进行描述,最后详细阐述制造节点基于智能体的订单处理流程。     

α稳定分布噪声环境下DLMP算法的收敛特性分析

本文给出了分数低阶统计量的一个定理,对DLMP算法的收敛性进行了数学分析和理论证明.包括:DLMP算法代价函数的收敛性证明以及DLMP算法步长因子μ值的选取分析.当p=2时,DLMP算法的代价函数,算法估计结果的无偏性以及算法的步长因子μ值的选取范围均与基于二阶统计量的DLMS算法保持了统一.证明了DLMP算法为DLMS算法在α(1＜α≤2)稳定分布噪声环境下的推广.