A two phases queueing system with Bernoulli vacation schedule under multiple vacation policy

This paper deals with a single server Poisson arrival queue with two phases of heterogeneous service along with a Bernoulli schedule vacation model, where after two successive phases service the server either goes for a vacation with probability p (0≤p≤1) or may continue to serve the next unit, if any, with probability q(=1−p). Further the concept of multiple vacation policy is also introduced here. We obtained the queue size distributions at a departure epoch and at a random epoch, Laplace Stieltjes Transform of the waiting time distribution and busy period distribution along with some mean performance measures. Finally we discuss some statistical inference related issues.     

草地早熟禾主要经济性状间的灰色关联分析

应用灰色关联分析方法研究了坪用草地早熟禾地上生物量、生殖枝数、生殖枝高、穗长、穗粒数、结实率等6个主要经济性状与种子产量以及各性状之间的关联程度。结果表明,各性状与种子产量之间的关联度大小依次为单位面积生殖枝数＞单位面积地上生物量＞生殖技高＞穗长＞结实率＞穗粒数。地上生物量对生殖校高、生殖枝数和穗长的影响较大。     

计算机辅助教学课件的应用分析

计算机辅助教学逐渐走进了课堂,选择适宜的教学软件是提高教学效果关键。本文简明扼要的阐述了计算机课件在教学活动中应遵循的基本原则,并对计算机辅助教学课件在教学活动中的地位和作用进行了客观分析和评价,为提高计算机计算机辅助教学课件的教学效果提供参考。     

光谱法测量等离子体离子温度和再循环粒子流速

利用多道光学分析仪（OSMA）测量HT-6M托卡马克限制器前Hα线形分布,通过高斯拟合由多普勒展宽和多普勒频移分别得出等离子体离子温度和再循环粒子流速。     

Cohort Succession in the US Housing Market: New Houses, the Baby Boom, and Income Stratification

Federal housing policy in the US across the postwar period supported the construction of new houses more than public provision or renovation of older structures as a means of ensuring a sufficient supply of quality dwellings. Understanding trends in new housing in particular is thus crucial to understanding the housing regime. Following Myers (Housing demography: Linking demographic structure and housing markets. University of Wisconsin Press, 1990; Housing Studies, 14, 473–490,1999), this paper conceptualizes historical change in the housing stock within a demographic framework as the movement of cohorts of households through cohorts of housing stock. Recent evidence suggests that a new cohort of houses arose in the 1980s and 1990s (larger with more amenities than past vintages), and that buyers of those new houses were increasingly affluent. In this paper, I link the succession to a new cohort of houses to household cohort succession and examine the increasing affluence of new house buyers by age and cohort, focusing especially on the entry of the Baby Boom generation exactly when the new cohort of houses arrived. I use US Census microdata for 1960–2000 to develop a cohort longitudinal dataset, and analyze historical change in stratification in new house ownership. I find significant shifts between cohorts in income inequality among new house buyers, with implications for the capacity of the housing regime to meet the future needs of an increasingly diverse population.

Survival Convergence and the Preceding Mortality Crossover for Two Population Subgroups

In this paper, we present and develop the argument that if the survival functions for two population subgroups converge in later life, a mortality crossover must precede the occurrence of this convergence. Specifically, two survival curves, S ₁(x) and S ₂(x), associated with two distinct population subgroups, G₁ and G₂, tend to converge before all members die out, as often observed and anticipated. This convergence leads to an increased mortality acceleration for the “advantaged” group, and eventually fosters the occurrence of a mortality crossover. We present a mathematical proof for this relationship and offer several explanations for the mechanisms involved in the process of survival convergence and the preceding mortality crossover. This new presentation demonstrates that mortality crossover is a highly observable demographic event given the trend of survival convergence in later life.     

基于主成分分析的企业信息化评价模型的研究

企业信息化评价由组织建设、基础建设、应用状况、效益指数四个一级指标,以及相应的19个二级指标构成。采用简单的加权合成法或者专家评分法,人为地给定权数,评价结果不能反映企业信息化的真实情况。采用主成分分析法,各主成分原有指标的载荷值和公因子方差值反映了它们对主成分所起作用,能为确定各指标的权重提供客观依据。     

信息化战争条件下军事需求与供给矛盾探析

军事需求与供给之间的矛盾,是军事与经济相驱发展的基本矛盾状态。深入分析信息化战争给军事需求与供给带来的制约和影响,揭示军事需求与供给矛盾的变化特征和发展趋势,是我军打赢信息化战争不可缺少的理论基础。     

人力资本、公平感知与农村居民基本医疗保险参与——基于四川农村地区的实证分析

城乡居民基本医疗保险作为构成我国社会保障体系的核心内容,既是农村居民获得所需医疗服务、应对健康危机的兜底性保障,也是国家推进基本医疗卫生服务公平均等的基础性政策。然而,基于四川省农村地区的调研发现,仍然存在农村居民没有购买基本医疗保险的现象。深入剖析其影响因素,结果发现：(1)人力资本水平、对基本医疗保险政策的公平感知均会显著作用于农村居民基本医疗保险购买行为;(2)外出务工经历、缴费便捷程度、家庭收入水平等也对农村居民基本医疗保险购买行为有显著影响;(3)当前对基本医疗保险政策知识宣传不够,难以满足农村居民对政策知识的需求。基于以上研究结果,为进一步提高基本医疗保险参与率,提出了优化基本医疗保险政策宣传、提高基本医疗保险政策的认同感和加快医保管理服务系统信息化建设等对策建议。     

论审美阅读的价值取向

读者审美阅读的过程,是激发读者情感和促使读者对作品进行再创造的过程。要达到审美阅读的效果,应注重从美与丑的对比、审美感受、叙述动作、美的形态等方面入手,激发出读者欣赏文学作品的审美能力。