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排序方式: 共有1598条查询结果,搜索用时 15 毫秒
1.
Financial stress index (FSI) is considered to be an important risk management tool to quantify financial vulnerabilities. This paper proposes a new framework based on a hybrid classifier model that integrates rough set theory (RST), FSI, support vector regression (SVR) and a control chart to identify stressed periods. First, the RST method is applied to select variables. The outputs are used as input data for FSI–SVR computation. Empirical analysis is conducted based on monthly FSI of the Federal Reserve Bank of Saint Louis from January 1992 to June 2011. A comparison study is performed between FSI based on the principal component analysis and FSI–SVR. A control chart based on FSI–SVR and extreme value theory is proposed to identify the extremely stressed periods. Our approach identified different stressed periods including internet bubble, subprime crisis and actual financial stress episodes, along with the calmest periods, agreeing with those given by Federal Reserve System reports. 相似文献
2.
A. M. Abd El-Raheem 《Journal of Statistical Computation and Simulation》2019,89(16):3075-3104
The generalized half-normal (GHN) distribution and progressive type-II censoring are considered in this article for studying some statistical inferences of constant-stress accelerated life testing. The EM algorithm is considered to calculate the maximum likelihood estimates. Fisher information matrix is formed depending on the missing information law and it is utilized for structuring the asymptomatic confidence intervals. Further, interval estimation is discussed through bootstrap intervals. The Tierney and Kadane method, importance sampling procedure and Metropolis-Hastings algorithm are utilized to compute Bayesian estimates. Furthermore, predictive estimates for censored data and the related prediction intervals are obtained. We consider three optimality criteria to find out the optimal stress level. A real data set is used to illustrate the importance of GHN distribution as an alternative lifetime model for well-known distributions. Finally, a simulation study is provided with discussion. 相似文献
3.
Acculturative stress in the adjustment of immigrant families 总被引:1,自引:0,他引:1
Tania N. Thomas 《Journal of Social Distress and the Homeless》1995,4(2):131-142
This study reviews the issue of acculturative stress in immigrant families. Acculturative stress includes behaviors experienced by immigrants that are a direct consequence of the process of acculturation and adaptation to a new society. A number of stressors impacting on the acculturation of immigrant families is discussed. These stressors include lack of English language skills, employment and economic status, educational background, family life, and sociopolitical and immigration status. 相似文献
4.
Brent A. McBride Sarah J. Schoppe Thomas R. Rane 《Journal of marriage and the family》2002,64(4):998-1011
This study examined variations in the relationships among child characteristics, parenting stress, and parental involvement. Participants were 100 two‐parent families with preschool‐aged children. Self‐report and interview data were collected to measure parental involvement, as well as perceptions of child temperament and parental stress. Analyses revealed significant, yet somewhat different, associations between child temperament and parental stress for mothers and fathers. More significant associations were found between perceptions of child temperament and involvement for fathers than for mothers. The associations between child temperament and parental stress and involvement differed on the basis of child and parent gender. Results are discussed in terms of future research on father involvement, as well as programs designed to encourage fathers to assume more active parental roles. 相似文献
5.
Jon M. Patterson 《Journal of marriage and the family》2002,64(2):349-360
The construct, family resilience, has been defined and applied very differently by those who are primarily clinical practitioners and those who are primarily researchers in the family field. In thisarticle, the family resilience perspective is integrated with conceptual definitions from family stress theory using the Family Adjustment and Adaptation Response (FAAR) Model in an effort to clarify distinctions between family resiliency as capacity and family resilience as a process. The family resilience process is discussed in terms of (a) the meaning of significant risk exposure (vs. the normal challenges of family life) and (b) the importance of making conceptual and operational distinctions between family system outcomes and family protective processes. Recommendations for future family resilience research are discussed. 相似文献
6.
植物液泡膜H+-ATPase及其在胁迫中的响应 总被引:4,自引:0,他引:4
V-ATPase存在于所有已知的真核生物中,在植物的生长、发育、信号转导和胁迫适应过程中发挥着重要的作用.近年来对V-ATPase的结构、功能和调节机制的研究进展较快,V-ATPase主要亚基已经完成序列测定及分析,并对各亚基生理功能、V-ATPase全酶复合体的组装、调控也有了较为深入的研究.该文在阐述植物细胞液泡膜H -ATPase的基本结构的基础上,介绍V-ATPase亚基组成、编码基因及在胁迫应答中的响应. 相似文献
7.
8.
受内压圆柱筒体开孔-接管区应力集中的有限元分析 总被引:4,自引:1,他引:3
利用 ANSYS有限元分析软件通过三个算例对圆柱形筒体小开孔直接管区、大开孔直接管区、大开孔斜接管区的应力分布状况进行了研究 .从中了解到了最大第一主应力的变化规律 ,得出在弹性范围内的应力集中系数 ,并且得到ASME规范中的算式较好的验证 相似文献
9.
孙冕 《淮海工学院学报(社会科学版)》2003,1(4):10-13
西汉中期,时为掌管封建中央财政事务大臣的桑弘羊在坚持先秦法家思想的基础上,先后推行和提出了大力发展官商,打击私商,实施盐铁专卖,均输平准等一系列的经济立法措施和财政政策,它是汉王朝社会经济方式由自由放任转向国家干预控制的重要转折,其思想对加强封建中央财政管理,充实封建国家财政收入和缓解社会财政危机发挥了重要的作用,其许多首创的理论和实践被后代各封建王朝的理财大臣看作是可望不可及的成功的财政典型,且为当时世界上不少国家所推崇和采用。研究这一中国古代法制史上的重要成果,对思考我们现实社会财政经济的改革发展有宝贵的借鉴意义。 相似文献
10.
英语单词重音位置的探讨 总被引:1,自引:0,他引:1
英语单词的重音位置不同于法语、波兰语等重音固定于几乎所有单词的某个位置上 ,英语单词的重音位置受到许多因素的影响 ,并出现了很多由此而产生的重音理论和方法。依据词根、词缀和生成音位理论来分析单词重音的位置测定 ,发现单词重音位置的一般规律 ,并总结出英语单词的重音和构词间存在着密切的关系是文章的主旨。 相似文献