区间线性规划的标准型及其最优值区间

定义了区间线性规划的标准型. 研究求解标准型区间线性规划的最好最优值和最差最 优值,从而确定其最优值区间. 分别对区间目标函数、区间不等式约束和区间等式约束作了讨 论. 基于此分别构造了求解区间线性规划最好最优值和最差最优值的确定型线性规划模型. 最 后给出一个算例并对一些特殊情况作了补充说明     

大规模定制模式下供应链计划调度优化分析

大规模定制模式下供应链生产计划调度问题是一个典型的随机需求与随机资源约束的 多目标动态优化问题. 在对该问题特征翔实描述,分析所总结的理论研究成果基础上,提出了 完整的随机多目标动态优化数学模型. 通过实例简要分析了优化目标的成熟性及模型的可行 性. 最后,指出了较为重要的动态优化调度过程的实现,并进行了实践应用过程的验证与说明     

目标函数为∑和max的双目标最短路问题:算法和复杂性

本文研究了一个双目标最短路问题。在该问题中,一个目标函数是∑形式,另一个目标函数是max形式。首先给出了一个时间复杂性为O(m²logn)的算法产生代表有效解集合。然后研究了∑和max的组合目标函数最短路问题,对动态问题和静态问题,分别给出了一个时间复杂性都为O(m²logn)的算法。最后在字典序最优解的意义下,本文给出了两个时间复杂性都为O(mlogn)的算法。     

Weibull tail-distributions revisited: A new look at some tail estimators

In this paper, we propose to include Weibull tail-distributions in a more general family of distributions. In particular, the considered model also encompasses the whole Fréchet maximum domain of attraction as well as log-Weibull tail-distributions. The asymptotic normality of some tail estimators based on the log-spacings between the largest order statistics is established in a unified way within the considered family. This result permits to understand the similarity between most estimators of the Weibull tail-coefficient and the Hill estimator. Some different asymptotic properties, in terms of bias, rate of convergence, are also highlighted.     

《现代评论》及其文学现代性问题

《现代评论》是中国现代文学史上一份重要的期刊。在20年代复杂的文化环境中,《现代评论》重视话语权的争夺,调和西方与中国传统文化观念,以泛化的爱关照人生,形成了独立的“现代性”品格。《现代评论》积极于文学形式的探索。     

Parameter Estimation Robust to Low-Frequency Contamination

We provide methods to robustly estimate the parameters of stationary ergodic short-memory time series models in the potential presence of additive low-frequency contamination. The types of contamination covered include level shifts (changes in mean) and monotone or smooth time trends, both of which have been shown to bias parameter estimates toward regions of persistence in a variety of contexts. The estimators presented here minimize trimmed frequency domain quasi-maximum likelihood (FDQML) objective functions without requiring specification of the low-frequency contaminating component. When proper sample size-dependent trimmings are used, the FDQML estimators are consistent and asymptotically normal, asymptotically eliminating the presence of any spurious persistence. These asymptotic results also hold in the absence of additive low-frequency contamination, enabling the practitioner to robustly estimate model parameters without prior knowledge of whether contamination is present. Popular time series models that fit into the framework of this article include autoregressive moving average (ARMA), stochastic volatility, generalized autoregressive conditional heteroscedasticity (GARCH), and autoregressive conditional heteroscedasticity (ARCH) models. We explore the finite sample properties of the trimmed FDQML estimators of the parameters of some of these models, providing practical guidance on trimming choice. Empirical estimation results suggest that a large portion of the apparent persistence in certain volatility time series may indeed be spurious. Supplementary materials for this article are available online.     

Children's disaster knowledge,risk perceptions,and preparedness: A cross-country comparison in Nepal and Turkey

While children are one of the groups at risk in disasters, they can also take an active part in disaster management, provided that the opportunity is given. This research examined the effect of disaster experience, disaster education, country, and city socioeconomic status on children's perceived risk and preparedness with a survey of 1335 children between 11 and 14 years old, in Nepal and Turkey. The survey used questionnaires and the pictorial representation of illness and self measure (PRISM) tool. Results showed that (1) children's risk perceptions were in line with their country-specific objective risks; (2) there were differences between the countries in relation to perception of risk for all the hazards except wildfire; (3) socioeconomic status had a statistically significant effect on children's perceptions of risk and preparedness for earthquakes, wildfires, that is, children who live in wealthier places had higher perceived risk and preparedness; (4) children in both countries showed similar trends in their knowledge of the correct protective actions to take in the event of a hazard occurrence. However, there is still room to enhance children's knowledge, in terms of safety behaviors, as the children selected many incorrect protective actions. There are important implications in terms of child-centered disaster management which hopefully will make life safer and help to create more resilience to disaster in society as a whole.     

重组情形下因“客观情况发生重大变化”解除劳动合同的构成要件分析——基于160份判决书的实证分析

北京、上海两地的法院在审理用人单位以业务重组构成“客观情况发生重大变化”为由要求解除劳动合同的案件时,对“客观情况发生重大变化”这一概念的涵摄范围和解约前交涉阶段双方应负担何种义务存在争议。鉴于劳动合同的不完全合同属性,“客观情况发生重大变化”相较于民法中的情势变更概念应更具包容性。由诚实信用原则衍生出的再交涉义务制度可为交涉双方设定框架性的诚信义务,并随个案情形细化为具体义务,对防范解除权滥用、矫正劳资双方在协商阶段的悬殊地位颇有助益。在我国劳动法领域确立再交涉义务制度的首要工作是明确诚实信用原则在劳动合同订立、履行、解除等各阶段的可适用性。     

以客观解释论解读重婚罪

依据客观解释论,结合中国传统文化理解“婚姻”,可以导出“合法性”不是婚姻的本质属性;以刑法的理念为指导解读“夫妻名义”,可以知道“夫妻名义”是婚姻实质的客观表述而不是口头的宣称;以刑法的目的导向洞察“重婚”,能够明白“重婚”的本质是二个或二个以上婚姻关系的并存与重合。     

汉语成语中的语义转移--以四字格目标域缺失的汉语成语为基点

隐喻的本质是源域到目标域的映射,文章以四字格目标域缺失的汉语成语为基点,从概念整合的角度分析目标域缺失成语中语义的转移.