一类四阶两点边值问题的多重正解

讨论一类两参数四阶两点边值问题,利用锥上的不动点指标理论及拓扑度方法,在一定条件下得到了该问题多重正解的存在性.     

一类二阶拟线性微分方程的非振动定理

考虑二阶拟线性微分方程 :( |y′|α -1y′)′+q(t) |y|α -1y=0 ,获得了在 q(t)振动的条件下该方程非振动的一些充分 (必要 )条件 ,改进和推广了已有文献的结果     

Testing for Stochastic Dominance Efficiency

We consider consistent tests for stochastic dominance efficiency at any order of a given portfolio with respect to all possible portfolios constructed from a set of assets. We justify block bootstrap approaches to achieve valid inference in a time series setting. The test statistics are computed using linear and mixed integer programming formulations. Monte Carlo results show that the bootstrap procedure performs well in finite samples. The empirical application reveals that the Fama and French market portfolio is first and second-order stochastic dominance efficient, although it is mean–variance inefficient.     

Forecasting lead times with economic data

Procurement lead time estimates are critical factors in production planning; however, they are generally based on a buyer's experience. The Westinghouse Corporation developed a linear model which successfully predicted procurement lead times for hot and cold rolled steel. This paper discusses nine models which use utilization and inventory data to predict lead time planning factors for aluminum, magnesium, steel and titanium products. The Lockheed-Georgia Company, which produces aerospace products, provided data for this research. The functional form of the models is significant and suggests that a nonlinear transformation of utilization based upon simple queueing models is a significant predictor of lead time duration.     

On the moment generating functions for integer valued random variables

Abstract

In this note, we give explicit expressions of moment generating functions for integer valued random variables in both univariate and multivariate cases, which extend the results obtained by Nadarajah and Mitov [Communications in Statistics–Theory and Methods, 32, 2003, 47–60] and more recently by Chakraborti, Jardim and Epprecht [The American Statistician, 2017], Kwong and Nadarajah [Communications in Statistics–Theory and Methods, 2017]. Some examples are also discussed.     

Combinatoric classification of multivariate normal variates

Consider classifying an n × I observation vector as coming from one of two multivariate normal distributions which differ both in mean vectors and covariance matrices. A class of dis-crimination rules based upon n independent univariate discrim-inate functions is developed yielding exact misclassification probabilities when the population parameters are known. An efficient search of this class to select the procedure with minimum expected misclassification is made by employing an algorithm of the implicit enumeration type used in integer programming. The procedure is applied to the classification of male twins as either monozygotic or dizygotic.     

气泡振动Noltingk-Neppiras方程的解析解的存在性

从Noltingk—Neppiras方程出发，考察了存在外加声场情况下的单气泡非线性振动方程。从理论上证明了该气泡振动方程周期解的存在性，并给出了方程的解析解。     

P(n,3)的两个新公式

本文得到p(n,3)的两个新公式,若仅从计算的角度上来看,比原有公式快捷一些.另外,从本文的公式出发,可大大简化推导P(n,4)的工作.     

当前我国社会分化中出现的问题及对策

社会分化中出现的复杂的社会问题,有一些是历史问题的延续,有一些是社会分化的伴生物,导致社会生活的各个领域呈现出暂时的不平衡性,成为引起社会冲突的潜在因素。研究社会分化中出现的社会问题对维护社会的稳定,保障小康社会目标顺利实现具有重大意义。     

现代仡佬族的民间法与民间纠纷解决方式——以贵州省大方县普底乡红丰村为例

红丰村还保留着一些独特的民间法规范,而且很多规范时时表现在他们的日常生活之中。其民间法规范主要表现为禁忌、族规和惯例等。红丰村的民间纠纷主要是邻里纠纷,家庭纠纷,林木纠纷和用电用水纠纷等。纠纷的解决方式有家族对纠纷的解决以及村委会和乡政府对纠纷的解决。