Robust principal component analysis for compositional tables

A data table arranged according to two factors can often be considered a compositional table. An example is the number of unemployed people, split according to gender and age classes. Analyzed as compositions, the relevant information consists of ratios between different cells of such a table. This is particularly useful when analyzing several compositional tables jointly, where the absolute numbers are in very different ranges, e.g. if unemployment data are considered from different countries. Within the framework of the logratio methodology, compositional tables can be decomposed into independent and interactive parts, and orthonormal coordinates can be assigned to these parts. However, these coordinates usually require some prior knowledge about the data, and they are not easy to handle for exploring the relationships between the given factors. Here we propose a special choice of coordinates with direct relation to centered logratio (clr) coefficients, which are particularly useful for an interpretation in terms of the original cells of the tables. With these coordinates, robust principal component analysis (rPCA) is performed for dimension reduction, allowing to investigate relationships between the factors. The link between orthonormal coordinates and clr coefficients enables to apply rPCA, which would otherwise suffer from the singularity of clr coefficients.     

甘南藏族自治州男性人口生命表和死亡分析

本文用Brass曾生子女存活比估算儿童死亡率的方法和Gompertz死亡率定律等方法对甘南藏族自治州的“五普”男性人口的死亡和生存原始数据作了进一步的修匀和校正。在此基础上。我们用Farlle死亡概率法编制出了甘南藏族自治州男性人口的简略生命表．并通过生命表的结果分析了甘南州男性人口的死亡水平、死亡模式和死亡的性别格局。     

光学平台隔振系统结构参数的优化设计

针对使用空气弹簧隔振器的光学平台传递函数进行了研究.对平台固有频率和传递函数的计算结果进行曲面拟合,并利用拟合曲面形成目标函数,进行平台隔振系统结构参数的优化设计计算.结果表明,要获得最佳隔振效果,应取相对阻尼系数ξ越小越好,但ξ过小使系统稳定性变差.最优值ξ为0.1～0.15,主空气室与附加空气室的容积比k为0.28.     

海南旧谱牒的功能和新谱牒纂修中的民间立场

谱牒是一个家族的生命史。海南谱牒以本族源流为先导 ,以世系图表为核心 ,着重记述了始迁祖以降的族脉延续。旧谱牒有着以族田等经济手段维系族众、以家法族规与国法互为补充等功能 ;新谱牒则呈现着内源性确证和族史考辨的个体写作实践与民间立场。     

基于视觉捕捉的网球自拾取机器人系统

为了规避网球比赛的风险,提高效率,开发了一套基于视觉捕捉的网球自动拾取机器人系统,由移动机器人平台 搭载机械臂自由移动对散落在网球场地的网球进行侦测并拾取。采用基于ARM的硬件架构搭建移动机器人的控制系 统平台,并通过网络控制接口与机器人平台上的图像采集与识别模块实现通信;将视觉采集捕捉到的网球的位置信息传 送给控制器,控制移动机器人移动定位,机械臂配合实现网球拾取。经模拟网球场运行证明设计方案可行,视觉的引入 节省了大量的人力与时间。开发的网球自拾取机器人系统有很强的实用性,具有一定的推广意义。     

Self-employment disadvantage in the working lives of blacks and females

Self-employment, regardless of its quality, offers the advantage of keeping individuals employed, thereby contributing to a continuous work history and earnings over the lifetime. But in the individual life cycle, how important is self-employment, particularly given evidence that self-employment spells tend to be of short duration? Also, to what extent does self-employment contribute to race and gender differences in lifetime employment? We use an increment-decrement life table to analyze the role of self-employment in differentiating the working lifetimes of blacks and women from those of white men. White men's average lifetime years spent in self-employment exceed black men's by as many as six years, thus accounting for nearly the entire difference between whiteand black men's lifetime years employed. White women's self-employment episodes,while almost as numerous as white men's, are shorter and less connected towage-employment episodes. Black women's self-employment episodes are bothinfrequent and of short duration.

     

网架式抗震全息照相实验台

本文主要介绍网架式抗震全息照相实验台的研发背景、创新点及使用效果。该专利已申请外观设计专利,专利号为zl200530146934.8。     

THE OPTIMAL TEST FOR SELECTING THE GREATER OF TWO BINOMIAL PROBABILITIES

The efficiency of a sequential test is related to the “importance” of the trials within the test. This relationship is used to find the optimal test for selecting the greater of two binomial probabilities, p_α and p_b, namely, the stopping rule is “gambler's ruin” and the optimal discipline when p_α+p_b≤ 1 (≥ 1) is play-the-winner (loser), i.e. an α-trial which results in a success is followed by an α-trial (b-trial) whereas an α-trial which results in a failure is followed by α b-trid (α-trial) and correspondingly for b-trials.     

Life tables and population parameters of the green leafhopper,Nephotettix cincticeps (Uhler), in the southwestern district of Japan with special reference to the first generation on foxtail grass

Summary The three year (1988–1990) life tables ofNephotettix cincticeps were constructed, and the daily survival rate and longevity of female adults were estimated by Hokyo and Kiritani’s (1967) method for the overwintering and the first-generations on the foxtail grass in Okayama, southwestern Japan. The life tables and the population parameter values estimated were compared with those in the other generations on rice. The FARMCOP suction sampler was employed to survey the population density. The durations of pre-ovarial maturation of female adults of the 1st generation on foxtail grass and rice seedling were similar. Longevity of adults of the overwintering and the first generations which emerged on the wild host was longer than that of the other generations (2nd and 3rd generations) on the rice plants. Fecundity of females decreased successively as the generation proceeded and it became lowest in the final 3rd generation. Only about 3.5 percent of first-instar nymphs of the 1st generation emerged as adults in the fallow field. The survival rate of nymphs on foxtail grass was always lower in comparison with that on rice plants. However, the survival rates of nymphs on foxtail grass and rice seedling were not significantly different from each other under laboratory conditions. In the fields, senescence of foxtail grass occurred in the midst of nymphal period of the 1st generation. The survival rate of nymphs on foxtail grass decreased with the increasing in the nymphal density. Abundance of spiders during the 1st generation was higher than that in the early stage of rice plants.     

JSP开发平台的建立

介绍了JSP开发平台的建立的过程,并针对在建立过程当中可能出现的一些问题,提出了解决方案。