海运服务业国际竞争力评价指标体系的构建

从微观视角出发,分析影响国际海运企业竞争力的决定性因素,构建适合于测度海运服务业国际竞争力的5F评价指标,并结合综合评价方法提出国际航运企业竞争力综合评价模型,为研究海运服务业国际竞争力提供分析工具。     

构建中职数学课程新模式的研究

以就业为导向是中等职业教育改革与发展的主旋律,知识结构与课程体系是教学改革的核心,数学学科以其对学生深远的影响意义更应成为改革的前沿。通过分析我省幼教师资现状以及中职幼教专业数学学科知识结构及课程体系存在的问题,提出了改革研究的具体做法与策略。     

On the non-Markovian structure of discrete order statistics

In this note we show that the Markov Property holds for order statistics while sampling from a discrete parent population if and only if the population has at most two distinct units. This disproves the claim of Gupta and Gupta (1981) that for geometric parent, the order statistics form a Markov chain.     

Admissible estimators in finite population sampling employing various types of prior information

We consider some estimators of the total and variance of a finite population from Bayesian and pseudo-Bayesian perspectives. Recently, Meeden and Ghosh (1982a, 1982b) have provided quite simple but powerful tools for proving admissibility of estimators and estimator-design pairs is finite population sampling problems. We consider what these techniques yield in the way of admissibility results for the estimators discussed.     

A basic lemma and the analysis of block and Kronecker product designs

In this paper the analysis of the class of block designs whose C matrix can be expressed in terms of the Kronecker product of some elementary matrices is considered. The analysis utilizes a basic result concerning the spectral decomposition of the Kronecker product of symmetric matrices in terms of the spectral decomposition of the component matrices involved in the Kronecker product. The property (A) of Kurkjian and Zelen (1963) is generalised and the analysis of generalised property (A) designs is given. It is proved that a design is balanced factorially if and only if it is a generalised property (A) design. A method of analysis of Kronecker product block designs whose component designs are equi-replicate and proper is also suggested.     

The superharmonic condition for simultaneous estimation of means in exponential familles

The mean vector associated with several independent variates from the exponential subclass of Hudson (1978) is estimated under weighted squared error loss. In particular, the formal Bayes and “Stein-like” estimators of the mean vector are given. Conditions are also given under which these estimators dominate any of the “natural estimators”. Our conditions for dominance are motivated by a result of Stein (1981), who treated the N_p (θ, I) case with p ≥ 3. Stein showed that formal Bayes estimators dominate the usual estimator if the marginal density of the data is superharmonic. Our present exponential class generalization entails an elliptic differential inequality in some natural variables. Actually, we assume that each component of the data vector has a probability density function which satisfies a certain differential equation. While the densities of Hudson (1978) are particular solutions of this equation, other solutions are not of the exponential class if certain parameters are unknown. Our approach allows for the possibility of extending the parametric Stein-theory to useful nonexponential cases, but the problem of nuisance parameters is not treated here.     

An optimal search procedure

Consider the following problem. There are exactly two defective (unknown) elements in the set X={x₁, x₂,…,x_n}, all possibilities occuring with equal probabilities. We want to identify the unknown (defective) elements by testing some subsets A of X, and for each such set A determining whether A contains any of them. The test on an individual subset A informs us that either all elements of the tested set A are good, or that at least one of them is defective (but we do not know which ones or how many). A set containing at least one defective element is said to be defective. Our aim is to minimize the maximal number of tests. For the optimal strategy, let the maximal test length be denoted by l₂(n). We obtain the value of this function for an infinite sequence of values of n.     

Two concepts of conditionality

Birnbaum's proof that C and M imply L, would lose its force if it is shown that in some situations M is not acceptable. Godambe (1979) has shown that Birnbaum's M is not as obvious or intuitive as the concept that a ‘mere relabelling’ of sample points should make no difference to the interference that can appropriately be drawn from a particular outcome of a given experiment. Akaike (1982) has shown that in certain situations M amounts to the assertion that a relabelling of sample points involving a false reporting of the outcome of an experiment should make no difference to the inference drawn from a particular outcome of a given experiment. It is shown in this paper that in the situation discussed by Akaike, even if M were to be considered acceptable, it is only a modified conditionality principle C? and M which can formally imply L; Birnbaum's conditionality principle C and M do not imply L.     

一二三产业融合发展的问题与对策研究

一二三产业融合发展有助于促进农业增效、农民增收和农村繁荣。基于苏南地区农户的问卷调查与实地调研结果表明,影响一二三产业融合发展的主要问题包括：促进农民增收的利益机制尚未健全;对产业融合的内涵认识存在偏差;融合主体的核心竞争力有待培育;融合的公共服务体系亟须完善以及融合中金融支持服务仍显不足等。据此提出相关政策建议如下：加快建立“保底收益+后续分红”的利益机制;加快推进农村集体资产产权制度改革;加快培育多元化融合主体;加快建设基础设施和公共服务平台;加快创新金融扶持政策和方式;加快推进人才培育和乡村文化传承等。