Admissible and minimax estimators of 363-1363-1363-1in the gamma distribution with truncated parameter space

In this paper we consider asmissible and minimax estimation of the parameter in the gamma distribution with truncated parameter space. We give a necessary and sufficient condition for minimaxity (Theorem 1) and obtain the classes of new minimax and asmissible estimators. The results of the paper can be applied to estimation of parameters in the normal, lognormal, Pareto, generalized gamma, generalized Laplace and other distributions.     

Estimation of the precision matrix of multivariate Pearson type II model

In this paper, the problem of estimating the precision matrix of a multivariate Pearson type II-model is considered. A new class of estimators is proposed. Moreover, the risk functions of the usual and the proposed estimators are explicitly derived. It is shown that the proposed estimator dominates the MLE and the unbiased estimator, under the quadratic loss function. A simulation study is carried out and confirms these results. Improved estimator of tr (Σ ⁻¹) is also obtained.     

Monotonicity of the (reversed) hazard rate of the (maximum) minimum in bivariate distributions

It is well known that in the case of independent random variables, the (reversed) hazard rate of the (maximum) minimum of two random variables is the sum of the individual (reversed) hazard rates and hence the onotonicity of the (reversed) hazard rate of the marginals is preserved by the monotonicity of the (reversed) hazard rate of the (maximum) minimum. However, for the bivariate distributions this property is not always preserved. In this paper, we study the monotonicity of the (reversed) hazard rate of the (maximum) minimum for two well known families of bivariate distributions viz the Farlie-Gumbel-Morgenstern (FGM) and Sarmanov family. In case of the FGM family, we obtain the (reversed) hazard rate of the (maximum) minimum and provide several examples in some of which the (reversed) hazard rate is monotonic and in others it is non-monotonic. In the case of Sarmanov family the (reversed) hazard rate of the (maximum) minimum may not be expressed in a compact form in general. We consider some examples to illustrate the procedureResearch of the second author is supported by a grant from Natural Sciences and Engineering Research Council and the research of the other two authors is partially supported by a travel grant from the Canadian American Center of the University of Maine     

绿色供应链管理中合作伙伴的评价与选择

合作伙伴的选择是绿色供应链管理中重要的环节之一。本文采用AHP与整数规划相结合的方法,提出一种两阶段的绿色供应链合作伙伴选择与评价模型。     

基于灰色GM(1,1)模型的河北沿海地区物流需求预测研究

以灰色预测理论为基础,通过不同的原始数据序列构建不同维度的GM(1,1)模型,对其预测精度进行比较;并选取精度最高的模型建立起新陈代谢模型,采用等维灰数递补的动态预测方法,对河北沿海地区"十二五"期间的物流需求进行预测。     

风水选址与台北城市发展之探讨

台北市是中国清朝最后一座按风水选址与规划的城市.作者通过文献研究考证了最初台北城的风水选址与方位布局.指出,这些在今天城市发展中在默默地发酵,对今日台北市城市街道的发展和重心区的使用发展上仍有巨大影响.     

VE/VM的理论发展:困惑、机遇和挑战(Ⅱ)——国外VE/VM的理论和应用研究进展

在国外,VE/VM理论研究进展的一个主要方面就是将现有的VE/VM与当今新出现的一些创新管理理念和方法结合起来,这些理论和方法包括:环境成本生命周期分析方法(Life Cycle Environmental Cost Analysis,LCECA)、信息支持思维方法(Information Support Process-based Thinking,ISP/T)、6 Sigma管理方法、组织和团队理论、创造性问题解决策略(Creative Problem Solving Strategies,CPSS)、发明性问题解决(Theory of Inventive Problem Solving,TRIZ)方法、复杂生产系统(Complex product systems,CoPS)、战略管理、系统方法论(SM)、等。通过这种结合,开阔了VE/VM原有的思维模式和视野。同时在提升VE/VM的应用绩效上比较明显。