Multi-valued strategy-proof social choice rules

In this paper we introduce a new definition of strategy-proofness for multi-valued social choice correspondences. We prove two Gibbard-Satterthwaite type results for strategy-proof social choice correspondences. These results show that allowing multiple outcomes as social choices will not necessarily lead to an escape from the Gibbard-Satterthwaite impossibility theorem. Received: 24 January 2001/Accepted: 19 March 2001     

简说李觏

李觏一生从事教育工作，尤其注重平民教育。他想要改革北宋的朝政，因为他未得机会进入仕途，所以无法实行自己的改革主张。胡适说李觏是王安石思想先驱，理由不充分。说曾巩是李觏的学生也无史料依据。关于李觏对孟子的非议，却反映了李觏对孟子的特殊看法。     

ETHNIC PLACES, POSTMODERNISM, AND URBAN CHANGE IN HOUSTON

City managers and urban sociologists traditionally viewed ethnic places as undesirable areas of overcrowding and social pathology. Regarded as either transitional districts or obstacles to modernization, ethnic places were subject to slum clearance during the modernist phase of urban development. Ethnic places have acquired a new historical and sentimental salience in the "postmodern" developmental era. Preservationist activists and minority "place entrepreneurs" project ethnic culture and symbolic representations in defensive or proactive ways to stimulate neighborhood revitalization. These trends are evident in the recent urban developmental history of Houston, Texas.     

中日银行不良债权成因比较分析

银行不良债权是中日两国面临的共同问题。本文在分析中日不良债权现状的基础上,从微观经济学和制度经济学视角对两国不良债权的成因进行了比较分析,并结合我国国情,得出解决这一问题的关键是消除形成金融不良资产的制度性根源,最后提出了化解我国不良债权的几点针对性措施。     

青少年性教育的有效抓手：同伴性教育

通过对我国青少年性教育现状的分析,发现父母和老师都没能很好地承担起青少年性教育的重任,造成这一状况的一个重要原因是两代人之间存在着沟通障碍.这就需要大力推广以同辈群体的影响力为基础的同伴性教育.     

奋发有为扎实工作圆满完成2002年工作任务

春回大地,万物复苏.祖国处处充满着生机与活力. 2002年是继续深化改革、加快对外开放的重要之年,是中国以世贸组织正式成员身分融入经济全球化之中的一年.我们将面临着机遇与挑战.     

Goodness‐of‐fit methods for matched case‐control studies

The authors propose graphical and numerical methods for checking the adequacy of the logistic regression model for matched case‐control data. Their approach is based on the cumulative sum of residuals over the covariate or linear predictor. Under the assumed model, the cumulative residual process converges weakly to a centered Gaussian limit whose distribution can be approximated via computer simulation. The observed cumulative residual pattern can then be compared both visually and analytically to a certain number of simulated realizations of the approximate limiting process under the null hypothesis. The proposed techniques allow one to check the functional form of each covariate, the logistic link function as well as the overall model adequacy. The authors assess the performance of the proposed methods through simulation studies and illustrate them using data from a cardiovascular study.     

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.     

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。