基于遗传算法的城际客运专线列车开行方案研究

分析城际客运专线列车开行方案的特点。以旅客时间消耗最小为目标，建立城际客运专线旅客列车开行方案的最小费用流模型。根据模型的特点，设计相应的遗传算法，并对遗传算法的适应值函数、算法步骤和算法复杂度进行分析。分析结果表明，该算法是一个收敛于全局最优解的近似有效算法。     

A true simulation study of three estimators at equal protection of respondents in randomized response sampling

In this study, three different estimators for estimating the proportion of a sensitive attribute in survey sampling are compared at equal protection of the respondents. The three estimators considered are due to Odumade and Singh (2009, Comm. Statist. Theory Methods) , Singh and Sedory (2011, Sociological Methods and Research) and a new estimator obtained by minimizing a chi‐squared distance. A SAS Macro is developed to compare these three estimators using a simulation study at equal protection of the respondents. A set of data from a real face‐to‐face interview was collected using two decks of cards and has been analyzed. The results are discussed.     

Vector network equilibrium problems with capacity constraints of arcs

In this paper, we study a (weak) vector equilibrium principle with capacity constraints of arcs and common arcs in some different paths. We obtain some necessary and sufficient conditions for a (weak) vector minimum cost flow. By virtue of a (weak) Δ-equilibrium principle, we also derive some necessary and sufficient conditions for a weak vector equilibrium flow.     

Robustly optimal monetary policy in a microfounded New Keynesian model

We consider optimal monetary stabilization policy in a New Keynesian model with explicit microfoundations, when the central bank recognizes that private-sector expectations need not be precisely model-consistent, and wishes to choose a policy that will be as good as possible in the case of any beliefs close enough to model-consistency. We show how to characterize robustly optimal policy without restricting consideration a priori to a particular parametric family of candidate policy rules. We show that robustly optimal policy can be implemented through commitment to a target criterion involving only the paths of inflation and a suitably defined output gap, but that a concern for robustness requires greater resistance to surprise increases in inflation than would be considered optimal if one could count on the private sector to have “rational expectations.”     

广西城镇居民最低生活保障线测算——基于扩展线性支出系统模型(ELES)的研究

最低生活保障线反映了一个地区的居民维持衣、食、住、行等基本生活的最低标准,是实施最低生活保障制度的基础。文章利用扩展线性支出系统模型对当前广西城镇居民最低生活保障线进行测算,并进一步测算其在未来几年内的发展趋势。测算数据表明,当前广西实际发放的城镇居民平均最低生活保障标准比测算标准低;未来几年内,在不考虑通货膨胀情况下,最低生活保障线呈上升趋势,但增幅不大。鉴于我国目前的物价上涨较快,政府在制定政策时必须有所考量。     

浅谈事故路段道路的排队长度问题

通过观察参考文献视频一中各个时间段内交通事故路段输入车辆与输出车辆的数目，运用SPSS软件，建立了统计回归模型。运用回归系数，得出了统计回归模型的参数。对模型进行了评估．进而得出了交通事故所影响的路段车辆排队长度与事故横断面实际通行能力和事故持续时间之间的关系。     

贫困山区农村最低生活保障制度运行绩效分析——以湖南省农村某地为例

农村最低生活保障制度的实施对于解决农村贫困问题有着十分重要的意义,而具体的实施效果是多种因素综合作用的结果。以湖南省张家界市农村地区调查资料为基础,建立农村最低生活保障制度的绩效评价体系。制度的实施使农村贫困人口逐年减少,以少量的财政资金解决了大量贫困人口的温饱问题。然而,制度的覆盖面仍需进一步扩展,保障对象的甄别机制仍需进一步完善,制度的公平性和有效性仍有较大的改进空间。     

大体积混凝土中水泥最低用量探析

大体积混凝土中水泥用量过高会导致其水化热温升,至使混凝土裂缝的问题提出。通过合理使用水泥、非活性骨料对水泥的选用、材料搭配等方法来降低水泥用量,以达到降低水化的温升问题。     

对个人所得税免征额的再认识

自从我国个人所得税制度建立以来，个人所得税免征额一直是一个有争议的问题。对此，笔者拟从以下四个方面对个人所得税免征额展开讨论：免征额与起征点之间的区别、免征额与最低生活保障线之间的关系以及不同免征额对不同地区和收入群体个人所得税税负的影响。     

Minimum‐data analysis of ecosystem service supply in semi‐subsistence agricultural systems

Antle and Valdivia (2006, Australian Journal of Agricultural and Resource Economics 50, 1–15) proposed a minimum‐data (MD) approach to simulate ecosystem service supply curves that can be implemented using readily available secondary data and validated the approach in a case study of soil carbon sequestration in a monoculture wheat system. However, many applications of the MD approach are in developing countries where semi‐subsistence systems with multiple production activities are being used and data availability is limited. This paper discusses how MD analysis can be applied to more complex production systems such as semi‐subsistence systems with multiple production activities and presents validation analysis for studies of soil carbon sequestration in semi‐subsistence farming systems in Kenya and Senegal. Results from these two studies confirm that ecosystem service supply curves based on the MD approach are close approximations to the curves derived from highly detailed data and models and are therefore sufficiently accurate and robust to be used to support policy decision making.