The random partition masking model for interval-censored and masked competing risks data

We study the nonparametric maximum likelihood estimate (NPMLE) of the cdf or sub-distribution functions of the failure time for the failure causes in a series system. The study is motivated by a cancer research data (from the Memorial Sloan-Kettering Cancer Center) with interval-censored time and masked failure cause. The NPMLE based on this data set suggests that the existing masking models are not appropriate. We propose a new model called the random partition masking model, which does not rely on the commonly used symmetry assumption (namely, given the failure cause, the probability of observing the masked failure causes is independent of the failure time; see Flehinger et al. Inference about defects in the presence of masking, Technometrics 38 (1996), pp. 247–255). The RPM model is easier to implement in simulation studies than the existing models. We discuss the algorithms for computing the NPMLE and study its asymptotic properties. Our simulation and data analysis indicate that the NPMLE is feasible for a moderate sample size.     

A parametric approach to theory of competing risks when the time of death from each cause follows a change-point hazard rate model

The paper a t tempts t o make i n f e r e n c e about the component parameters, based on data from a series system, when the components each follow a different changepoint hazard r a t e model.The paper extends the result of Nattbews and Farewell (1982) to the competing risk framework.     

基于生物学拟态视角的中国啤酒企业竞争策略研究

啤酒企业的生存和发展与其所处的外部环境密切相关。啤酒企业要形成可持续发展能力，必须与外部环境相适应。这需要啤酒企业因势利导，借鉴生物学拟态方式密切地监测、分析和研究与啤酒行业发展相关的外部环境条件，通过梳理各种外部环境信息，正确研判啤酒行业未来的变化与发展趋势，找出影响和制约啤酒企业生存与发展的各种因素，并依此制定出与外部环境相适应的啤酒企业竞争策略。     

Protecting the Nation's Military May Include the Use of Investigational New Drugs

Clinician researchers have a number of roles, each of which carries specific obligations. There are times when these obligations may be in competition (up to and including conflict) with each other. Using a narrative case study that describes a group of colleagues discussing their clinical department's participation in an industry-sponsored research protocol, we illustrate a number of the obligations faced by clinician researchers, and discuss how competing interests and obligations can lead to ethical problems. The case study is followed by a discussion of the effect of university–industry relations on competing interests and obligations in both clinical research and the role of the university, and a suggested framework that could be used to determine when university involvement in commercial research is ethically acceptable.     

管中窥豹：豫南一个村落土地流转中的利益竞争

从社会学的角度,以豫南窗台村的土地流转案例入手,运用社会学关系产权与利益政治分析框架,分析具体社会情境下各个产权主体如何在土地权益的争夺中审时度势,在实践中选择适合自身的关系运作策略。分析发现,在两层所有制结构中,土地流转效率并不是各个主体首要考虑的问题,社会关系运作提供各个主体适时调整利益规则的空间,使弱者的土地权益获得一定的补偿。     

基于前景理论的新产品开发方案选择方法

为了解决新产品开发中考虑竞争产品方案评价信息的方案选择问题,提出了一种基于前景理论的决策分析方法。在该方法中,依据新产品开发方案与竞争产品方案相比的绩效确定前景参考点,并给出了前景价值函数和权重函数;通过计算和比较新产品开发方案的前景值和竞争产品方案的前景值,得到新产品开发方案的优选结果;最后给出一个算例,说明该方法的可行性和有效性。     

一种提高局部搜索能力的混合遗传算法

针对遗传算法局部搜索能力弱的缺陷,提出了一种改进的混合遗传算法。根据遗传的不同阶段分为两个不同的群体——竞争群体和适应性群体,提出相关的遗传算子——繁殖因子。将运筹学中的单纯形法应用于遗传算法中,增强了遗传算法的局部搜索能力。对复杂函数的寻优实验验证了混合遗传算法的有效性,并通过与传统SGA的实算结果对比,更进一步说明了算法的改进效果。     

评《中华人民共和国物权法(草案)》的物权变动二元结构

以登记合同成立模式为起点,我国上世纪80年代以来的物权变动模式立法逐步形成了债权形式主义和对抗主义两种模式并存的格局。作为一种与古典绝对物权观对应的模式,债权形式主义不仅割裂了模式构造与现代物权法的权利基础———观念物权之间的内在联系,违背了物权观念和物权变动模式演进的历史规律,也为一物二卖、物权行为理论提供了土壤,未来物权法应当以科学的对抗主义统一物权变动模式。     

A Class of Non-parametric Tests in the Competing Risks Model for Comparing Two Samples

We consider a model when a process involving the production of elements is under inspection. The elements have possible failures due to competing risks. We assume the availability of a data set of failure times, D₁, obtained when the process is under control. Our main goal is to test if the failure rates in D₁ are equal to or less than the failure rates in another data set D₂, against "undesirable" neighbouring alternatives. A class of tests based on a two-dimensional vector statistic is obtained. Linear test statistics with weight functions giving optimal local asymptotic power are derived. Martingale techniques are used. An example illustrates the derivation of reasonable tests     

努力打造和提升东华理工学院核心竞争力

进入21世纪，建立核心竞争力问题引起我国企事业单位的普遍关注。文章解释了什么是核心竞争力，对东华理工学院特色和优势从历史、学科设置、服务面等角度进行了阐述，就学院的核心竞争力的形成进行了分析，并对如何打造和提升东华理工学院核心竞争力提出建议。