软件宏观拓扑结构标准结构熵和度的演化分析

现代软件生存周期可以看做是一个软件结构的演化过程.基于大量开源软件的统计数据,分析了标准结构熵、高度值节点数量和新增节点中低度值节点所占比例的演化,然后分析了度中心化指标较高的节点数量和新增节点中该指标较高的节点数量的演化.结果表明,标准结构熵和度中心化指标较高的节点数量普遍呈下降趋势,高度值节点数量呈上升趋势,新增节点大都为低度值节点.由此得出,成功实践的软件演化过程中,软件网络和软件结构的复杂性增长速度是逐步降低的.本研究对于指导软件开发有重要的作用.     

基于距离判别法的雹云识别模型

【目的】提高雹云识别准确率,降低因冰雹造成的经济损失。【方法】依据气象雷达反射率图像,利用Kmeans聚类提取云层的内外轮廓,计算其距离方差;利用雷达软件提取云高数据并计算云高的一阶统计测度;将云层内外层轮廓的距离方差与云高一阶统计测度相结合,构造雹云判别模型。【结果】利用此模型对已有样本检测,可知该模型识别率判别准确率为88.75%,准确率较高。【结论】通过内外轮廓方差与云高一阶统计测度构造的距离判别模型有较好的判别效果。     

浅谈数据库在地质数据统计中的应用

针对地质数据一般具有量大、分散等特点,常规统计有耗时、费力、易错等不足的情况,以东营油田王岗区块为例,利用数据库对录井、分层与钻井等数据进行综合统计处理,提取特定层段的砂地比、砂泥比等参数,为高效准确地绘制砂地比、砂泥比等值线图提供了有力的支持,避免了复杂的编程,且与常规办公软件相兼容。实例应用表明,这一方法极大地提高了地质数据统计处理的效率与质量。     

Excel在残数法计算药物动力学参数中的应用

目的:探求残数法计算药物动力学参数的简单方法。方法:采用Excel对数据进行线性回归,得出曲线方程,根据截距和斜率计算K及Ka。结果:利用Excel能正确、快速计算出K及Ka值。结论:将Excel应用残数法计算K及Ka值能减少工作量,提高准确率及工作效率。     

Quantitative genetic analysis station for the genetic analysis of complex traits

The Quantitative Genetic Analysis Station (QGAStation) is a software package that has been developed to perform statistical analysis for complex traits.It consists of five domains for handling data from diallel crosses,regional trials,core germplasm collections,QTL mapping,and microarray experiments.The first domain contains genetic models for diallel cross analysis,in which genetic variance components and genetic-by-environment interactions can be estimated,and genetic effects can be predicted.The second domain evaluates the performance of varieties in regional trials by implementing a general statistical method that outperforms ANOVA in tackling unbalanced data that arises frequently in trials across multiple locations and over a number of years.The third domain,using predicted genotypic values as proxy,constructs core germplasm collections covering sufficient genetic diversity with lower redundancy.The fourth domain manages genotypic and phenotypic data for QTL mapping.Linkage maps can be constructed and genetic distances can be estimated;the statistical methods that have been implemented apply to both chiasmatic and achiasmatic organisms.Another part of this domain can filter systematic noises in phenotypic data.The fifth domain focuses on the cDNA expression data that is generated by microarray experiments.A two-step strategy has been implemented to detect differentially expressed genes and to estimate their effects.Except in the fourth domain,the major statistical methods that have been used are mixed linear model approaches that have been implemented in the C language.Computational efficiency is further boosted for computers that are equipped with graphics processing units (GPUs).A user friendly graphic interface is provided for Microsoft Windows and Apple Mac operating systems.QGAStation is available at http://ibi.zju.edu.cn/software/qga/.     

SPSS在物理实验数据处理中的应用

利用统计软件SPSS的统计分析和作图等功能,结合如光电效应、放射性衰变和元素的电离能等具体实例,介绍应用SPSS14.0处理物理实验数据和作图的方法.     

浅谈MATLAB软件在教育统计中的应用

如何对实验结果进行统计分析,以得到准确有效的结论是教师进行教育实验研究中的一个重要问题．随着信息技术的发展,人们越来越多使用的计算机来处理数据．用MATLAB软件对教育实验数据进行统计分析是一个全新的思路,利用MATLB软件提供的统计功能,可以方便地进行教育统计分析如：数据分析、统计绘图以及数值计算等,简单易学,而且功能强大,可以在教育统计中广泛应用,以提高处理数据的效率和准确性．     

过程模型化数据处理软件PROM-1的设计与实现

以化工过程开发为背景,提出一个过程模型化数据处理的通用程序,编制成实用软件PROM-1在IBM-PC、PC/XT及其兼容机种上实现。PROM-1软件具有实验设计,曲线拟合、参数估值、统计检验等一整套实验室数据处理的计算功能;具有结构模块化、标准化程度高、全部采用菜单选择、人机对话进行输入输出、使用简便易学、通用性强等特点,经使用证明,该软件能大大缩短过程模型化的研究周期、方便使用者、提高科研及教学的效率。     

Size-dependent solid-solid phase transition process of Ag2S nanoparticles

It is well known that for a nanoparticle the solid-solid phase transition begins with the appearance of a high temperature disordered phase at the surface and the phase interface moves inward gradually with the increase of temperature. However, the size-dependent phase transition behavior remains unclear. Here we report an in-situ TEM study of the phase transition process of different-sized Ag₂S nanoparticles at atomic resolution. The onset temperature of disordered phase of the small nanoparticle is found to be lower than that of the big nanoparticle. And, the disordered phase thickness of small nanoparticle is always thicker than that of big nanoparticle. By considering surface and interface free-energy, a phenomenological model based on the minimization of system free-energy is established, which could well explain our experimental results. These discoveries extend our understanding of size dependent phase transition mechanism.     

“概率统计”课程教学新模式探讨

概率论与数理统计是应用性很强的一门数学学科.在教学中,为了培养学生的学习兴趣以及提高他们应用"概率统计"知识解决问题的能力,应将这门课程与实际结合起来;同时,在教学过程中要善于利用统计软件,还有教师自身也要不断学习新的科研成果.     

Investigation of the biological roles of autophagy in appressorium morphogenesis in Magnaporthe oryzae

Magnaporthe oryzae has been used as a primary model organism for investigating fungus-plant interaction. Many researches focused on molecular mechanisms of appressorium formation to restrain this fungal pathogen. Autophagy is a very high conserved process in eukaryotic cells. Recently, autophagy has been considered as a key process in development and differentiation in M. oryzae. In this report, we present and discuss the current state of our knowledge on gene expression in appressorium formation and the progress in autophagy of rice blast fungi.     

基于VC++的海水营养盐测试软件系统设计

基于VC++平台开发了海水营养盐测试软件系统,建立了相应的系统软件数据结构,能够在软件的运行过程中,根据每种营养盐的具体测试需要重新配置测试过程,系统可以动态地执行营养盐的测试流程。实验结果表明,该设计提高了系统的适应性,使测试更加灵活。     

基于EXCEL的统计学教学改革

统计学是关于数据的科学,传统的手工处理数据方法已经过时,统计软件的使用,让统计数据的处理变得简便快捷。在统计学教学方面,传统的统计学教学在教学内容、教学模式、考试内容和考试模式上已经跟不上时代发展变化的要求,在EXCEL环境下对统计学的教学内容、教学模式、考试内容和考试模式进行改革是适应时代发展的要求,也是提高学生综合分析能力的必然选择。     

计算机辅助数据处理在大学物理实验中的应用

总结了大学物理实验中手工数据处理存在的问题,比较了几种不同数据处理软件的优缺点.在科学研究领域有着广泛应用的Origin软件由于简单易学、操作灵活、功能强大,利用其处理实验中数据统计分析、数据绘图、误差计算等问题不仅准确而且方便,适合在大学物理实验中推广使用.     

On indexing in the Web of Science and predicting journal impact factor

We discuss what document types account for the calculation of the journal impact factor （JIF） as published in the Journal Citation Reports （JCR）. Based on a brief review of articles discussing how to predict JIFs and taking data differences between the Web of Science （WoS） and the JCR into account, we make our own predictions. Using data by cited-reference searching for Thomson Scientific＇s WoS, we predict 2007 impact factors （1Fs） for several journals, such as Nature, Science, Learned Publishing and some Library and Information Sciences journals. Based on our colleagues＇ experiences we expect our predictions to be lower bounds for the official journal impact factors. We explain why it is useful to derive one＇s own journal impact factor.     

质量管理信息系统的研制

介绍了用于质量数据分析与处理的计算机,通过ＱＭＩＳ系统可以快速而有效地对质量数据进行统计分析,以实现质量管理与控制的目的。     

A ballistocardiogram measurement system for home monitoring: design,performance, and evaluation

We present a ballistocardiogram （BCG） measurement system for obtaining the BCG signal. The performance of the BCG measurement system was tested, including the dynamic response frequency of the platform （32 Hz with a 75 kg load）, and the signal to noise ratio of the system （minimum 23 dB）. Factors that could influence BCG recording during measurement were investigated by collecting data from 48 healthy subjects （28 males and 20 females）. The basic features of the BCG signal, such as the amplitude and time interval, were extracted, and differences by gender were analyzed. A correlation between the IJ amplitude （amplitude difference between I-and J-peak） and the respiration phase was found （R2 = 0.49）. The BCG signals for both sitting （SiBCG） and standing （StBCG） postures were obtained using this system. These showed that the StBCG amplitudes were larger than those of SiB- CG but there was no significant difference in the time intervals. The robustness of our system was verified, and its potential for noninvasive cardiac activity monitoring was demonstrated.     

Proteomics study of the effects of high pigment-1 on plastid differentiation during the ripening of tomato fruits

The chloroplast-to-chromoplast difference is a highly regulated process. Tomato （Solanum lycopersicum） high-pigment mutant hp-1 shows an enhanced accumula- tion of carotenoids coupled with an increase in the volume and number of plastids. However, how chromoplasts of hp-] acquire their specific metabolic characteristics is still unclear. A comparison of proteome profiles from plastids at the mature green, breaker, and red stages of tomato fruits showed 45 differentially expressed proteins. These identi- fied proteins fell into six different functional categories. Our results showed that most of the proteins related to the Calvin cycle increased transitorily only at the early breaker stage, and remained unchanged at the early red stage. We found 18 proteins that were differentially expressed between the wild type and hp-1. The abundance of GCPE in chromoplasts of hp-1 was higher than that in the wild type. Meanwhile, we found that heat shock proteins were only present specifically in the mature green stage chromoplasts of hp-1 but not in the wild type. This suggested that GCPE and heat shock proteins might play important roles in the accumulation of high carotenoids in hp-1. Overall, our results could be helpful for understanding chloroplast-to-chromoplast differentiation and the function of hp-1.     

软件产业安全评价指标体系与实证研究

产业安全指标体系是产业安全评价的基础和依据,但由于产业间的巨大差异,无法采用统一的标准.针对目前缺乏软件产业安全研究的现状,根据软件产业的特点,设计了软件产业安全的原始评价指标.运用因子分析法对数据进行定量分析,构建软件产业安全的三级评价指标体系,结合层次分析法确定了各指标的权重.用2007—2013年间的数据对我国软件产业安全进行了实证分析,结果显示我国软件产业处于较不安全的状态.最后,提出维护我国软件产业安全的对策.     

山西省上市公司资本结构经济效果实证研究

通过建立净资产收益率与资产负债率的一元线性模型，运用实证会计研究方法，利用SPSS统计分析软件，分析了20家山西省上市公司2002-2006年的95个样本观测值，得出了二者存在正相关关系的结论，以期对山西省正在进行的上市公司股权分置改革提供一些建议。