英语课堂模拟教学--高师英语专业学生向初中英语教师角色转变的有效途径

培养合格的初中英语教师是高师英语专业教育的核心目标,实现这一目标应从教学技能训练及其实践能力的培养着手.英语课堂模拟教学作为<英语教学法>课程中教学技能训练内容的主要形式,既使学生有效地获得课堂教学技能和初步的教学实践能力,又强化了学生从教的思想,从而促进了学生向英语教师角色的转换.     

车辆路径问题的并行粒子群算法研究

设计了一种引入了模拟退火机制的并行粒子群算法.该算法结合了基本粒子群优化算法的快速寻优能力和模拟退火算法的概率突跳性,避免了基本粒子群优化算法易于陷入局部最优的缺点,提高了进化后期算法的收敛精度.将该算法用于解决车辆路径问题,实验结果表明该算法具有较好的性能.     

模拟法庭实践环节在土地法教学中的强化

模拟法庭是法学课程重要的实践教学方式。随着土地法学精品课程建设的深入,模拟法庭教学在提高师生能力、适应课程需要等方面发挥了更大的作用。在法学院模拟法庭已建立的基础上,需进一步做好土地法模拟案例选取、开庭准备、法庭辩论、分析总结等环节,不断完善土地法实践教学体系。     

Tests for normality with stable alternatives

This paper is concerned with testing normality of observations and regression disturbances when the alternative belongs to the stable family.     

旅游日语教学初探

高质量的旅游日语教学是培养高素质的日语导游的基本条件之一。以贵州旅游日语为中心通过新旧教学方式及内容的对比,尝试改变传统的教学手段,并采取问卷调查和实地模拟导游的教学模式,研究和探讨适应贵州旅游人才培养的方案及措施。     

Modeling Heterogeneity and State Dependence in Consumer Choice Behavior

In frequently-purchased-consumer-goods markets, consumer brand choices exhibit substantial persistence across purchase occasions. In this article, I estimate a choice model that admits of both heterogeneity in preferences and true state dependence as sources of this persistence, using Nielsen scanner data on ketchup. I find evidence for true state dependence in the choice process, even after controlling for a rich heterogeneity structure. Simulation of the model indicates that the long-term effect of a promotion-induced purchase on future purchase probabilities is positive but small.     

Simulated maximum likelihood estimation in joint models for multiple longitudinal markers and recurrent events of multiple types,in the presence of a terminal event

In medical studies we are often confronted with complex longitudinal data. During the follow-up period, which can be ended prematurely by a terminal event (e.g. death), a subject can experience recurrent events of multiple types. In addition, we collect repeated measurements from multiple markers. An adverse health status, represented by ‘bad’ marker values and an abnormal number of recurrent events, is often associated with the risk of experiencing the terminal event. In this situation, the missingness of the data is not at random and, to avoid bias, it is necessary to model all data simultaneously using a joint model. The correlations between the repeated observations of a marker or an event type within an individual are captured by normally distributed random effects. Because the joint likelihood contains an analytically intractable integral, Bayesian approaches or quadrature approximation techniques are necessary to evaluate the likelihood. However, when the number of recurrent event types and markers is large, the dimensionality of the integral is high and these methods are too computationally expensive. As an alternative, we propose a simulated maximum-likelihood approach based on quasi-Monte Carlo integration to evaluate the likelihood of joint models with multiple recurrent event types and markers.     

Adolescents’ perceptions of parental influences on commercial and simulated gambling activities

Parents can have a major influence on young people’s access to and participation in gambling activities. However, with the rise of digital online gambling, there is greater potential for young people to freely explore and engage in gambling activities without parental oversight. This study examined perceived parental influences on adolescents’ gambling activities, including differences in these influences across commercial and simulated types of activities, and the association between parental influences and problem gambling symptoms. A survey of 824 adolescents from 3 secondary schools was conducted. The results indicated that financial gambling was usually facilitated by a parent, particularly for scratch tickets and sports betting. Simulated gambling activities, such as social casino games, tended to be reported as being unsupervised by parents. Young people’s perceptions of parents’ measures to limit, restrict or oversee online and electronic activities were not significantly associated with youth simulated gambling. Their perceptions of parental influences were not significant predictors of problem gambling behaviours. This study underscores the need to examine potential differences in how adolescents develop an understanding of different gambling activities without parental influences, and adds to the continuing debate on the necessity of regulation and other countermeasures to limit young people’s access to simulated gambling activities.     

基于改进小生境GA的有时间窗物流配送路径优化问题研究

有时间窗的物流配送车辆路径优化问题是一个NP难题,较难得到满意解.本文在基于隔离机制的小生境遗传算法的基础上,引入迁徙操作和模拟退火方法,用来解决有时间窗的车辆路径优化问题.这种方法不仅能够保证群体的多样性,而且具有良好的全局收敛性.实例也证明了该方法的有效性和实用性.     

An Equilibrium Model of Health Insurance Provision and Wage Determination

We investigate the effect of employer‐provided health insurance on job mobility rates and economic welfare using a search, matching, and bargaining framework. In our model, health insurance coverage decisions are made in a cooperative manner that recognizes the productivity effects of health insurance as well as its nonpecuniary value to the employee. The resulting equilibrium is one in which not all employment matches are covered by health insurance, wages at jobs providing health insurance are larger (in a stochastic sense) than those at jobs without health insurance, and workers at jobs with health insurance are less likely to leave those jobs, even after conditioning on the wage rate. We estimate the model using the 1996 panel of the Survey of Income and Program Participation, and find that the employer‐provided health insurance system does not lead to any serious inefficiencies in mobility decisions.