保障房建设完成情况的衡量指标研究

内地公共住房没有一套完整长期持续的计划,衡量一个地区保障性住房的建设成绩是是否按质按量按时完成政府分配的保障性住房任务,即以计划建设量与开工量来衡量,该种方式在当下环境中是不科学的,建立合理的衡量指标问题日益迫切。从香港公屋的"轮候配屋制"入手,探讨衡量保障房建设情况的合理方法,得出应用平均轮候时间衡量地区保障房落实情况的结论。     

Eligibility for Maternity Leave and First Birth Timing in Great Britain

This paper examines the impact of maternity leave legislation on first birth timing in Great Britain. When maternity leave was introduced in Great Britain in 1976, the eligibility requirement for full-time employees was to have been working for the same employer for at least 2 years. Using data from the British Household Panel Survey (BHPS), this paper examines whether women postponed first birth in accordance with tenure requirements for maternity leave. Higher transition rates to first birth are found for those who had acquired enough employer tenure to qualify for maternity leave than for those who did not yet qualify. However, the causal role of maternity leave legislation for first birth timing is uncertain, since transition rates to first birth began to diverge by employer tenure even before 1976.

Purchase timing models in marketing: a review

In this work we review various approaches to modeling the purchase behavior of consumers in marketing. Special emphasis is given to the timing of purchases. We also discuss in detail a new approach which models the hazard function in a flexible dynamic way thus yielding self-exciting phenomena. In particular our approach is able to incorporate seasonal and advertising effects and past purchase decisions. The method is applied to panel data for fast moving consumer goods.     

Pubertal Timing and Adolescent Substance Initiation

We tested 3 competing hypotheses regarding the relation between pubertal timing and substance initiation in adolescence: the early timing, off-time, and stressful change hypotheses. We used longitudinal data from the Developmental Pathways Project (N = 521). Youth reported whether they had ever tried alcohol, tobacco, or marijuana at baseline, and then again at 6-, 12-, 18-, 24-, 36-, and 72-month follow-up interviews. We estimated interval censored parametric survival models and tested interactions between pubertal timing and gender and race variables. We found robust support for the early timing hypothesis, but no support for the off-time and the stressful change hypotheses.     

中国保险业的进入与退出壁垒研究

本文从保险业进入壁垒与退出壁垒的关联性分析了完善我国保险市场退出机制的重要性,认为只有在实行开放政策、降低保险业进入壁垒的同时,形成有效的市场退出机制,才能有助于我国保险市场竞争机制的充分发挥与保险业市场结构的优化,并论述了建立退出机制后,我国保险业的发展对策。     

基于信任和企业进入退出机制的产业集群规模演化研究

本文从信任演化的角度出发,以产业集群规模为研究对象,建立了基于信任和企业进入退出机制的演化模型,并利用计算机辅助语言,研究不同进入壁垒的集群规模演化的规律。结果发现,由于信任机制和进入壁垒对集群企业竞争与合作的调节作用,集群规模的演化呈现一定的规律性,演化过程可区分为生长、淘汰、震荡和稳定四个阶段,演化曲线呈倒"S"型,稳定成熟期规模的大小与进入壁垒的高低有关,且进入壁垒对企业进入和生存作用相反。     

恶性价格竞争成因探讨

在界定恶性价格竞争的基础上 ,运用产业组织理论、经营战略理论和市场营销理论 ,分析得出恶性价格竞争是在特定的宏观条件下 ,由于改革尤其是国有企业改革的不到位、大多数行业进入壁垒低、退出壁垒高以及市场营销管理不科学造成的。最后提出恶性价格竞争的解决要依赖于政府职能的转变、政企分开以及企业市场营销管理的加强     

试论打击国际恐怖主义犯罪的时机、依据及限制

打击国际恐怖主义犯罪,必须掌握好打击的时机、依据及限制。打击的准确时机是针对正在进行的国际恐怖主义犯罪行为,应对“预先防卫”或“滞后防卫”合法性进行分析。打击的依据当然是相关的国际法,必须处理好国际法与相关国内法的关系,同时必须防止“打击过当”,掌握好打击的必要性、相称性。     

采用时间序列查询的原型系统的设计和实现

介绍了时间序列相似性查询的基本算法、研究现状和存在的问题 ,讨论了采用时间序列查询的系统原型的设计和实现方法 ,对系统主要模块的功能以及各模块之间的交互和同步进行了说明     

同步齿形带的研究使用现状与发展

本文在总结了同步齿形带传动的起源、发展过程及研究使用现状和同步齿形带常用的几种运动变换方式的基础上 ,分析了目前齿形带传动的发展趋势