基于Newsboy及多个竞争网商的订货模型建构

以需求受价格和广告投入影响的Newsboy问题为研究对象,结合网络环境,建立了不确定环境下多个竞争网商进行最优定价、广告投入和订货量的联合确定模型,指出该模型存在唯一的纳什均衡解。最后给出案例进行数值解法演示,以模型建构和应用来优化网商订货策略,帮助网商订货、定价、广告和库存管理决策。     

运营商与SP合作关系的系统动力学仿真研究

运营商与服务提供商（SP）的竞合关系一直是各方关注的重点问题,以移动增值业务产业链为研究对象,对SP和运营商的业务收入影响因素进行分析的同时,使用系统动力学进行仿真分析。通过对各影响因素调整,找到最优的合作模式,以实现整个产业链利润最大化。     

关于反垄断民事责任的若干思考

反垄断民事责任的承担涉及到主体、行为、方式等方面的问题。理论上说反垄断民事责任的承担主体应为实施了垄断行为的任何＂人＂,但在实际承担责任时并非如此,许多主体特别是具体实施了垄断行为的企业内部人员、行业协会、滥用行政权力的行政机构及其法律、法规授权的具有管理公共事务职能的组织等通常不能作为独立的民事责任主体。由于垄断协议以及经营者集中等行为具有不同性质,其民事责任的承担也会有所差别。反垄断民事责任的承担在一定情形下需要考虑反垄断机构的前期行为,责任的具体认定也有别于一般民事责任。民事责任承担的方式主要是停止或消除垄断行为以及赔偿损失。     

Job stress,burnout and substance use among urban transit operators: The potential mediating role of coping behaviour

Abstract

Urban transit operators, compared to other occupational groups, have higher rates of mortality and morbidity. A major risk factor is the highly stressful objective environment. This study used structural equation modelling to test a model hypothesizing that transit operators’ coping behaviours in responding to daily job hassles mediate the associations of work stress with burnout and substance use. The study sample consisted of 1231 transit operators who participated in the San Francisco MUNI Health and Safety Study. The results showed a direct and strong association between transit operators’ daily job stress and symptoms of occupational burnout even when a series of controls and coping behaviours were considered. In addition, use of “disengage-deny” and escapist strategies to cope with job stress was positively associated with burnout; the job stress–burnout association was partially mediated through such coping practices. Daily job stress was related to substance use only indirectly and mediated through burnout and use of “disengage-deny” and escapist coping strategies. “Disengage-deny” coping strategies might help reduce substance use whereas escapist coping strategies might increase such use. Overall, our findings suggest that coping behaviour may be an important correlate of transit operators’ ill health. Interventions enabling healthy coping behaviours may help reduce health risks for this occupational group.     

应用不等权重支持向量机预测人民币汇率的变动

基于金融时间序列的近期数据对未来的影响会大于早期数据,对应用于金融时间序列预测的支持向量机方法进行改进,给出了不等权重支持向量机方法（USVM）及其多项式光滑化处理。将不等权重支持向量机方法应用于训练样本集的子集确定预测模型,实证分析表明USVM算法预测是有效的。     

Restricted minimax robust designs for misspecified regression models

The authors propose and explore new regression designs. Within a particular parametric class, these designs are minimax robust against bias caused by model misspecification while attaining reasonable levels of efficiency as well. The introduction of this restricted class of designs is motivated by a desire to avoid the mathematical and numerical intractability found in the unrestricted minimax theory. Robustness is provided against a family of model departures sufficiently broad that the minimax design measures are necessarily absolutely continuous. Examples of implementation involve approximate polynomial and second order multiple regression.     

BCI-代数环与BCI-代数上的多项式

引入了BCI-代数上多项式的概念 ,并讨论了几种BCI -代数环     

Spatial hidden Markov models and species distributions

A spatial hidden Markov model (SHMM) is introduced to analyse the distribution of a species on an atlas, taking into account that false observations and false non-detections of the species can occur during the survey, blurring the true map of presence and absence of the species. The reconstruction of the true map is tackled as the restoration of a degraded pixel image, where the true map is an autologistic model, hidden behind the observed map, whose normalizing constant is efficiently computed by simulating an auxiliary map. The distribution of the species is explained under the Bayesian paradigm and Markov chain Monte Carlo (MCMC) algorithms are developed. We are interested in the spatial distribution of the bird species Greywing Francolin in the south of Africa. Many climatic and land-use explanatory variables are also available: they are included in the SHMM and a subset of them is selected by the mutation operators within the MCMC algorithm.     

一类多元Bernstein算子的加权逼近

主要讨论了一类二元的Bernstein算子的加权逼近问题。首先，我们举例说明在通常的加权范数下它是无界的。然后我们给出了一类新的加权范数，在此范数下它是有界的。最后我们利用一类新的加权K一泛函给出了二元Bernstein算子加Jacobi权逼近的特征刻划。     

一类非线性算子方程组的选代求解

在Ｂａｎａｃｈ空间上，利用锥理论与迭代方法研究了一类非线性算子方程组解的再在性与唯一性，推广了文［１］的主要结果，并给出了应用。