Inefficiency of strategy-proof allocation mechanisms in pure exchange economies

In this paper I prove that in the standard model of 2×n (n2) pure exchange economies there is no allocation mechanism that is efficient, non-inversely-dictatorial, and strategy-proof. This strengthens two previous results on this subject by Hurwicz and by Dasgupta, Hammond, and Maskin.I thank Alvin Klevorick, William Thomson, and an anonymous referee of the journal for many helpful comments.     

我国中小企业融资难的对策

中小企业融资难的程度及资金需求类型往往不同。只有对中小企业科学分类,把握不同类型企业的融资需求和风险大小,才能进行有效的分类指导。     

幼儿园区域游戏课程生发策略探索

新时代幼儿园区域游戏课程改革应正确处理游戏、课程、儿童学习与发展三者的关系,以游戏为课程的生成源,依托 课程促进儿童的学习与发展。主要教育策略建议：坚持儿童本位,探索区域游戏课程生成之源;立足儿童问题,探寻区域 游戏课程生长之径;适时支架助力,探寻区域游戏课程发展之策。     

民意调查在中国的发展和应用

民意调查在中国出现较早,但其发展还是始于党的十一届三中全会。1992年以后,中国的民意调查形成了调查主体、资金来源、调查内容多元化的发展态势,并且具有了新的发展特点。民意调查应用于社会的各个方面,主要表现在反映社会评价、辅助决策、社会监测、舆论沟通和学术促进等几个方面。     

As low birth weight babies grow,can well-educated parents buffer this adverse factor? A research note

This research note combines two national Taiwanese data sets to investigate the relationships among low birth weight (LBW) babies, their parents' educational levels, and their future academic outcomes. We find that LBW is negatively correlated with the probability of such children attending college at age 18; however, when both parents are college or high school graduates, such negative effects may be partially offset. We also show that discrimination against daughters occurs, but only for daughters who were LBW babies. Moreover high parental education can buffer the LBW shock only among moderately LBW children (as compared with very LBW children) and full-term LBW children (as compared with preterm LBW children).     

21世纪世界人口面临的主要问题与挑战

人类跨入 2 1世纪 ,在迅速发展经济的同时 ,也面临着一些问题和挑战。世界人口数量急剧增长 ,人口倍增时间大为缩短。人口老化速度加快 ,在 2 1世纪的前 10年 ,世界各国都将出现人口老龄化趋势。随着现代化工业和市场经济的飞速发展 ,全球人口城市化速度日益加剧。同时贫困人口问题困扰发展中国家。人类为了满足自身发展的需要 ,导致自身资源日益减少 ,生态环境日益恶化 ,如不设法采取补救措施 ,将会面临一场生态灾难     

Solving unobserved heterogeneity with latent class inflated Poisson regression model

Inflated data and over-dispersion are two common problems when modeling count data with traditional Poisson regression models. In this study, we propose a latent class inflated Poisson (LCIP) regression model to solve the unobserved heterogeneity that leads to inflations and over-dispersion. The performance of the model estimation is evaluated through simulation studies. We illustrate the usefulness of introducing a latent class variable by analyzing the Behavioral Risk Factor Surveillance System (BRFSS) data, which contain several excessive values and characterized by over-dispersion. As a result, the new model we proposed displays a better fit than the standard Poisson regression and zero-inflated Poisson regression models for the inflated counts.KEYWORDS: Inflated data, latent class, heterogeneity, Poisson regression, over-dispersion     

现代汉字学学科建设问题刍议

经过近百年的努力探索,现代汉字的研究取得了很大的成绩,特别是20世纪50年代以来,现代汉字研究在字频统计和分析、汉字规范化研究以及汉字代码、汉字输入法等方面更是取得了可喜的成果。但是,我们还应该看到,无论是基础研究还是应用研究,特别是学科建设方面,还有不够完善之处,有必要进一步加以探讨。     

企业投资决策分析方法及应用

目的/意义针对投资决策中偏好信息为区间模糊数的多准则决策问题,提出了一种基于冲突最小化的群体决策方法。设计/方法首先,以决策整体最优为目标,构建极大熵规划模型求解决策准则权重;其次,以决策总冲突程度最小化为目标,构建优化模型求解决策成员权重;然后,建立决策方案的比较可能度矩阵和排序向量模型,获得问题决策方案排序结果。最后,通过一个投资决策实例进行应用,验证了方法的有效性和科学性。结论/发现该方法能够解决投资群体决策中的冲突问题,在投资决策中形成偏好最一致的决策方案。     

论文化地理学视阈中的河朔诗派

河朔诗派是明末清初崛起于燕赵大地的一个诗歌流派,它的形成及诗歌创作与诗论主张包含了特定时间和空间的社会文化背景.从文化地理学视阈来看,可以说正是独特的山水风物孕育了河朔诗派的诗歌情怀,浓烈的燕赵情怀确立了河朔诗派的诗歌生命基调,特殊的时空熔铸了河朔诗派愤激而和平的诗学倾向.