Arrovian impossibilities in aggregating preferences over non-resolute outcomes

Let A be a set of alternatives whose power set is . Elements of are interpreted as non-resolute outcomes. We consider the aggregation of preference profiles over into a (social) preference over . In case we allow individuals to have any complete and transitive preference over , Arrow’s impossibility theorem naturally applies. However, the Arrovian impossibility prevails, even when the set of admissible preferences over is severely restricted. In fact, we identify a mild “regularity” condition which ensures the dictatoriality of a domain. Regularity is compatible with almost all standard extension axioms of the literature. Thus, we interpret our results as the strong prevalence of Arrow’s impossibility theorem in aggregating preferences over non-resolute outcomes. This paper is part of a project entitled “Social Perception—A Social Choice Perspective”, supported by Istanbul Bilgi University Research Fund. It has been completed while Remzi Sanver was visiting Ecole Polytechnique, Paris. We are grateful to both institutions. We thank Nick Baigent, two anonymous referees and an anonymous associate editor for their valuable comments.     

Turkey: a pilot study of elder mistreatment in a convenience sample

Attitudes towards elder abuse were explored through a survey on International Perspectives on Family Violence and Abuse in a Turkish convenience sample of 25 females and 14 males, ranging in age from 22 to 58. Participants gave examples of behaviors considered in their culture to be extremely abusive, moderately abusive, and mildly abusive from an adult child toward his or her older parent. Responses were coded into four major categories of abuse, each of which had several subcategories: psychological aggression (including the subcategories of verbal aggression, emotional abuse, disrespect, disobedience, power assertion, blame, and imprisonment), neglect (including physical neglect, psychological neglect, abandonment, and putting the older individual into a nursing home), physical aggression (including beating and hitting), and mistreatment related to goods and services (including economic demands, economic withholding, and labor). The most common examples of extreme abuse were neglect, particulary physical neglect, followed by physical abuse. At the moderate and mild levels, various forms of psychological aggression were most commonly mentioned. The only significant gender difference was that men listed more instances of verbal aggression as examples of extreme abuse than women. A positive correlation was found between age and the number of abandonment examples at the extreme level. Results were interpreted from a cultural perspective.     

浅谈高校内部审计的职能与作用

以《教育系统内部审计工作规定》为出发点,结合高校内部审计实践经验,对高校内部审计的职能与作用进行了探讨。文章将高校审计职能主要归纳为经济监督、经济评价、经济鉴定等三个方面,在高效内部审计应发挥的作用方面,强调了在重视经济监督作用的同时,突出经济评价和经济鉴定作用的发挥。     

浅析军训对大学生心理素质教育的促进

军训教育是大学生进入大学的第一必修课,也是对大学生进行心理素质教育的重要组成部分。军训教育可以提高大学生的思想政治觉悟,增强团队沟通意识,培养良好的意志品质。因此,要加强组织领导,将军事化管理纳入日常管理范围,增加军训内容,真正达到思想上、生活中和工作中的渗透效应。     

中国通货膨胀与RPV——基于理论模型的实证研究

文章简单介绍了有关通货膨胀与RPV关系的理论并构建了理论模型;然后估算了中国加权的RPV与不加权的RPV以及通货膨胀率,再构建单变量的GARCH模型将通货膨胀率分解为预期通货膨胀、非预期通货膨胀和通货膨胀不确定性三个要素,并运用估计得到的数据实证检验了中国通货膨胀与RPV的关系.研究得出中国通货膨胀与RPV呈指数型非线性关系,并且存在结构断点,国外有关通货膨胀与RPV关系的理论模型也得到了一定地数据支持,但是单独一种理论模型无法全面解释中国RPV与通货膨胀的关系,三种模型结合起来也是不健全的.     

An ant colony optimization approach for the proportionate multiprocessor open shop

Multiprocessor open shop makes a generalization to classical open shop by allowing parallel machines for the same task. Scheduling of this shop environment to minimize the makespan is a strongly NP-Hard problem. Despite its wide application areas in industry, the research in the field is still limited. In this paper, the proportionate case is considered where a task requires a fixed processing time independent of the job identity. A novel highly efficient solution representation is developed for the problem. An ant colony optimization model based on this representation is proposed with makespan minimization objective. It carries out a random exploration of the solution space and allows to search for good solution characteristics in a less time-consuming way. The algorithm performs full exploitation of search knowledge, and it successfully incorporates problem knowledge. To increase solution quality, a local exploration approach analogous to a local search, is further employed on the solution constructed. The proposed algorithm is tested over 100 benchmark instances from the literature. It outperforms the current state-of-the-art algorithm both in terms of solution quality and computational time.

     

Sampling refugee groups: The example of Syrians in Turkey

Quantitative surveys among refugees not only advance our scientific understanding of forced migration, but they also provide political and civil society actors with the information they need to take measures to improve their protection and living conditions. These actors often need to acquire such information within a short period of time. However, the methods to access and survey this group to gain valid findings are subject to scientific debates. Based on a survey among Syrian refugees in Turkey, this article demonstrates a study design that generated valid knowledge about this population within a limited amount of time and resources. As a unique feature of the article, we compare our sample with four other sources of information to scrutinize how well it resembles the target population. As we can show, although point estimations differ to some extent, the internal distributions of sample characteristics are comparable across sources confirming the success of our sampling method.