基于多标准的ABC分类库存模型

ABC分类库存方法是企业应用最广泛的库存分类方法之一。国内外学者在研究ABC库存分析法时通常只针对一种分类标准,然而按照多种标准进行分类的库存模型则研究的相对较少。提出了一种新型的基于多标准的ABC分类库存模型,此模型概括了线性和非线性的情况,重点研究库存物品权重在分类中的影响作用。通过对比本模型与AHP方法所得出的结果,然后进行数据整理、对比分析,得出了库存物品的权重在分类决策中占有非常重要的地位。最后,通过数据证明得到此研究方法在库存决策方面更优,能够更好地为库存管理者提供决策依据。     

论学科的分类

人类的知识体系不能只是简单地分为社会科学和自然科学两大类,而应该分为社会科学、自然科学、思维科学、工程科学和人文学科五大类.这五类学科互相交叉、互相渗透,构成了错综复杂的知识体系.搞清学科的分类对学科本身的发展和社会的发展都大有益处.     

也谈历史行政地理分析法在方言分区中的应用——以苏沪嘉地区为例

利用《汉语方言地图集》的材料,对苏沪嘉地区方言的语音、词汇、语法进行综合比较.在此基础上,运用历史行政地理分析法,对苏沪嘉方言的分区方案进行讨论,指出维持原来划分的苏沪嘉小片是最佳方案.     

Saving behaviour and earnings uncertainty: Evidence from the British Household Panel Survey

For the first time, this paper uses a panel data set, the British Household Panel Survey, to analyse saving behaviour in Britain. One objective is to test the precautionary saving hypothesis, according to which households save to self-insure against uncertainty. Our results show that in accordance with this hypothesis, various measures of uncertainty based on earnings variability have a statistically significant effect on households' saving decisions. Moreover, in accordance with the life cycle model, households save more if they expect their financial situation to deteriorate. Received: 15 June 1999/Accepted: 4 January 2001     

Childhood family structure and young adult behaviors

This paper examines a wide variety of forms, and full histories, of family structure to test existing theories of family influences and identify needs for new theories. The focus is on links between childhood family structure and both completed schooling and risk of a nonmarital birth. Using a 27-year span of panel (PSID) data for U.S. children, we find that: (a) change is stressful, (b) timing during childhood is relevant, (c) adults other than parents are important, and (d) two more recently studied family structures (mother-with-grandparent(s) and mother-with-stepfather) do not fit the molds of existing theories. The findings suggest that new theories should consider allocation of resources and reasons people group into family structures. Received: 11 September 1998/Accepted: 27 March 2000     

Intention to emigrate in transition countries: the case of Albania

We analyse the profile of potential emigrants from Albania using data from the Central and Eastern Europe Eurobarometer in 1992. Respondents were asked to rate on a four-point scale the likelihood that they would go to live in Western Europe. Our results show that intention to emigrate is correlated positively with males, education and certain occupations, and negatively with age. There is little relation between emigration and income. Those who support the introduction of a free market in Albania are also more likely to emigrate than those who do not. Received: 24 August 1998/Accepted: 17 April 2000     

Ecosystem resilience, specialized adaptation and population decline: A modern Malthusian theory

The purpose of this article is to construct a theoretical framework characterizing the interactions among economic development, ecosystem equilibrium and possible population decline, and to discuss the population dynamics in the very long run. In our framework, economic activities bridge population and environment. On the one hand, human beings reform the environment through economic activities; on the other hand, economic activities decrease environmental resilience and increase the possibility of an environmental change in a discontinuous and irreversible pattern, as described in Arrow et al. (1995). Furthermore, a highly developed economy also causes over-specialization of human adaptation, which tends to exaggerate the impact of an environmental change on human population size. Received: 19 January 1999/Accepted: 3 July 1999     

Sparse Bayesian variable selection in multinomial probit regression model with application to high-dimensional data classification

Here we consider a multinomial probit regression model where the number of variables substantially exceeds the sample size and only a subset of the available variables is associated with the response. Thus selecting a small number of relevant variables for classification has received a great deal of attention. Generally when the number of variables is substantial, sparsity-enforcing priors for the regression coefficients are called for on grounds of predictive generalization and computational ease. In this paper, we propose a sparse Bayesian variable selection method in multinomial probit regression model for multi-class classification. The performance of our proposed method is demonstrated with one simulated data and three well-known gene expression profiling data: breast cancer data, leukemia data, and small round blue-cell tumors. The results show that compared with other methods, our method is able to select the relevant variables and can obtain competitive classification accuracy with a small subset of relevant genes.     

城市空间关系问题研究——以黄冈与武汉城市圈内周边城市空间关系为例

城市化的快速发展使得城市空间关系不断变化,如何准确界定城市空间关系对城市战略选择至关重要。本文在总结前人对城市空间关系研究的基础上,将城市空间关系分为依附型、竞争型、共生型、异质型四种。进而在此基础上以黄冈为案例,研究黄冈与武汉城市圈内周边城市的关系,并提出黄冈的定位和发展战略。     

略论20世纪法国人类学思想的嬗变

肇始于迪尔凯姆学派的法国人类学在20世纪取得了辉煌的成就.其思想发展进程可概述如下:首先,马塞尔·莫斯和赫兹提出了"二元分类"思想;其后,列维-斯特劳斯在广泛吸收、综合社会学、人类学和语言学等学科思想的基础上,以"二元对立"的认知结构为核心,建构了结构主义人类学.所有这些成果,对皮埃尔·布迪厄在20世纪60年代的人类学研究产生了重要影响.