具有实时语音播报运动木棒长度计量仪的设计

本文设计了集成语音播报、键盘操作功能及实时显示于一体的运动木棒长度计量综合系统,阐述了系统的硬件组成,并在设计中利用软件编程方便灵活的特点,来满足系统设计要求．最后对系统进行了测试．     

Admissible stochastic complexity models for classification problems

In this paper we investigate the application of stochastic complexity theory to classification problems. In particular, we define the notion of admissible models as a function of problem complexity, the number of data pointsN, and prior belief. This allows us to derive general bounds relating classifier complexity with data-dependent parameters such as sample size, class entropy and the optimal Bayes error rate. We discuss the application of these results to a variety of problems, including decision tree classifiers, Markov models for image segmentation, and feedforward multilayer neural network classifiers.     

流动人口群体特征变动与失业风险差异

本文采用2014年和2017年流动人口动态监测数据,探讨了中国省际流动人口失业风险的变动趋势以及影响因素.研究发现:2017年省际流动人口失业风险比2014年高出26％.性别、受教育程度、流动原因、流入地地域等变量对流动人口失业风险的边际影响出现了明显上升趋势.Oaxaca分解结果表明,流动人口失业风险上升的63.67...     

The unit-inverse Gaussian distribution: A new alternative to two-parameter distributions on the unit interval

A new two-parameter distribution over the unit interval, called the Unit-Inverse Gaussian distribution, is introduced and studied in detail. The proposed distribution shares many properties with other known distributions on the unit interval, such as Beta, Johnson S_B, Unit-Gamma, and Kumaraswamy distributions. Estimation of the parameters of the proposed distribution are obtained by transforming the data to the inverse Gaussian distribution. Unlike most distributions on the unit interval, the maximum likelihood or method of moments estimators of the parameters of the proposed distribution are expressed in simple closed forms which do not need iterative methods to compute. Application of the proposed distribution to a real data set shows better fit than many known two-parameter distributions on the unit interval.     

The Relationship Between Length and Number of Homeless Episodes and Engagement in Survival Sex

Survival sex is associated with many health problems, including increased substance use and HIV risk. Current research on survival sex among homeless individuals has given little attention to the unique effects of how length and number of homeless episodes influence engagement in survival sex. Using secondary data analysis from the Washington, DC, Metropolitan Area Drug Study (DC*MADS) (N = 783), the authors examined the relationship of days and number of times homeless to engagement in survival sex, while controlling for other sociodemographic and clinical characteristics. Results showed that length of homelessness and number of homeless episodes, as well as current age, previous drug use, depression, and institutionalization, increased the odds of engaging in survival sex. Results support current efforts on interventions to transition homeless individuals into housing as rapidly as possible. Service providers assisting the homeless can affect engagement in survival sex and its associated risks through creating referral networks for integrated treatment programs for co-occurring substance use and mental health problems while advocating for early housing interventions and increased housing retention. Further research is needed regarding the ways in which length of homeless episodes affects risky behaviors such as survival sex, with a particular focus on all age groups.     

A class of confidence intervals for sequential phase II clinical trials with binary outcome

The phase II clinical trials often use the binary outcome. Thus, accessing the success rate of the treatment is a primary objective for the phase II clinical trials. Reporting confidence intervals is a common practice for clinical trials. Due to the group sequence design and relatively small sample size, many existing confidence intervals for phase II trials are much conservative. In this paper, we propose a class of confidence intervals for binary outcomes. We also provide a general theory to assess the coverage of confidence intervals for discrete distributions, and hence make recommendations for choosing the parameter in calculating the confidence interval. The proposed method is applied to Simon's [14] optimal two-stage design with numerical studies. The proposed method can be viewed as an alternative approach for the confidence interval for discrete distributions in general.     

谈我国研究生教育的学制改革与培养机制问题

就目前我国高等学校研究生学制改革过程中出现的关于学制应该是两年还是三年的争论,在结合国内外研究生教育工作的相关历史和经验教训的基础上,剖析了我国研究生教育培养过程中学制改革存在的一些主要问题,并提出了相应的解决问题对策。     

The optimal choice of negative binomial charts for monitoring high-quality processes

Good control charts for high quality processes are often based on the number of successes between failures. Geometric charts are simplest in this respect, but slow in recognizing moderately increased failure rates p. Improvement can be achieved by waiting until r>1 failures have occurred, i.e. by using negative binomial charts. In this paper we analyze such charts in some detail. On the basis of a fair comparison, we demonstrate how the optimal r is related to the degree of increase of p. As in practice p will usually be unknown, we also analyze the estimated version of the charts. In particular, simple corrections are derived to control the nonnegligible effects of this estimation step.