Factor screening in nonregular two-level designs based on projection-based variable selection

In this paper, we focus on the problem of factor screening in nonregular two-level designs through gradually reducing the number of possible sets of active factors. We are particularly concerned with situations when three or four factors are active. Our proposed method works through examining fits of projection models, where variable selection techniques are used to reduce the number of terms. To examine the reliability of the methods in combination with such techniques, a panel of models consisting of three or four active factors with data generated from the 12-run and the 20-run Plackett–Burman (PB) design is used. The dependence of the procedure on the amount of noise, the number of active factors and the number of experimental factors is also investigated. For designs with few runs such as the 12-run PB design, variable selection should be done with care and default procedures in computer software may not be reliable to which we suggest improvements. A real example is included to show how we propose factor screening can be done in practice.     

本科实验教学模块建设与运行相关问题探讨

介绍了《材料性能实验教学模块》的概况及其总体规划思路,回顾了其建设与运行情况,以《材料性能实验教学模块》为实例,从实践和理论2个方面对本科实验教学模块建设、运行等相关问题进行了探讨,并总结了近年来的教学实践经验。     

Robust nonparametric estimation with missing data

In this paper, under a nonparametric regression model, we introduce two families of robust procedures to estimate the regression function when missing data occur in the response. The first proposal is based on a local M$M$-functional applied to the conditional distribution function estimate adapted to the presence of missing data. The second proposal imputes the missing responses using the local M$M$-smoother based on the observed sample and then estimates the regression function with the completed sample. We show that the robust procedures considered are consistent and asymptotically normally distributed. A robust procedure to select the smoothing parameter is also discussed.     

“保险性质”期权定价模型及其应用研究

针对传统期权风险大的特点，以欧式看涨期权为基础提出一种风险小、价格低的特殊期权——“资产保险性质”期权，即期权买者出于对标的资产的保险目的，签订期权合约后，若标的资产价格上涨，期权买者将其一部分收益支付给期权卖者，以这种交易方式对传统期权产品进行改进并重新定价，从而得出“保险性质”期权及其定价公式。针对和传统期权的价格变动状况，用Excel进行了模拟比较，证明了“保险性质”期权价格低（吸引期权买者）、风险小（利于期权卖者的风险控制）的特点。“保险性质”期权产品的开发将对我国各类金融市场的建设具有现实意义。     

膏状金霉素流变特性影响因素的试验研究

针对膏状金霉素物料，通过试验研究，在不同温度，不同时间，不同含水率条件下对该膏状物进行了较为广泛的剪切应力与速率之间关系的测试，分析，并由此推出该物料的一般性流变性质，从而为实现其合理输送，最终的喷雾干燥技术奠定一定的理论基础。     

运用表面光电压技术对半导体表面光电特性的研究

对运用表面光电压技术(SPS)对半导体材料光电性质的研究进行了综述,系统阐述了表面光电压谱(SPS)和场诱导表面光电压谱(FISPS)在测定半导体类型、表面态及其能级位置、表面电荷分布、半导体的能带隙等方面所表现出的优越性质.研究了半导体能带隙所表现出的特有性质.     

A Bayesian approach to non-parametric monotone function estimation

Summary.  The paper proposes two Bayesian approaches to non-parametric monotone function estimation. The first approach uses a hierarchical Bayes framework and a characterization of smooth monotone functions given by Ramsay that allows unconstrained estimation. The second approach uses a Bayesian regression spline model of Smith and Kohn with a mixture distribution of constrained normal distributions as the prior for the regression coefficients to ensure the monotonicity of the resulting function estimate. The small sample properties of the two function estimators across a range of functions are provided via simulation and compared with existing methods. Asymptotic results are also given that show that Bayesian methods provide consistent function estimators for a large class of smooth functions. An example is provided involving economic demand functions that illustrates the application of the constrained regression spline estimator in the context of a multiple-regression model where two functions are constrained to be monotone.     

唐代壁记研究

壁记属于"记"体文的一种,辞尚体要,文主典雅,以散体为主,兼有骈句,以其载体为名。壁记多书写在台省、州县的厅等办公场所,具有开放性、连续性的特点。作壁记或为劝善戒恶,或为自我儆诫,或为下情上达。研究壁记,对于研究古代散文的传播及古代官制、官职都有一定的意义。     

当代大学生不良行为对就业能力的影响

在高校校园中，当代大学生身上存在如吸烟、沉迷网络、逃课、考试作弊等不良行为，这些不良行为严重影响和制约着大学生的身心健康和成才就业。阐述了当代大学生不良行为的主要表现及危害，分析了不良行为对就业能力的影响。