Sampling from spatial databases

This paper deals with techniques for obtaining random point samples from spatial databases. We seek random points from a continuous domain (usually ²) which satisfy a spatial predicate that is represented in the database as a collection of polygons. Several applications of spatial sampling (e.g. environmental monitoring, agronomy, forestry, etc) are described. Sampling problems are characterized in terms of two key parameters: coverage (selectivity), and expected stabbing number (overlap). We discuss two fundamental approaches to sampling with spatial predicates, depending on whether we sample first or evaluate the predicate first. The approaches are described in the context of both quadtrees and R-trees, detailing the sample first, acceptance/rejection tree, and partial area tree algorithms. A sequential algorithm, the one-pass spatial reservoir algorithm is also described. The relative performance of the various sampling algorithms is compared and choice of preferred algorithms is suggested. We conclude with a short discussion of possible extensions.     

基于获取决策优先权的零售商战略联盟效益分析

对于由一个供应商和多个零售商组成的单一产品、单周期供应链,在确定型市场、零售商成本对称以及供应商具有关于零售商成本结构完全信息的情况下,考虑了同时带来运作成本与决策权分配变化(基于获取决策优先权)的零售商定货数量决策联盟。利用博弈论方法,研究了获取决策优先权的零售商战略联盟对参与联盟的零售商、未参与联盟的零售商、供应商以及供应链整体收益的影响。证明这种零售商战略联盟不可能使供应链中所有成员都同时增加收益。但在一定的条件下,联盟能实现某种部分"多赢";使供应链整体、供应商和参与联盟的零售商收益增加,或使供应商和参与联盟的零售商收益增加。     

正确把握新时代坚持和加强党的全面领导的逻辑理路——中国化马克思主义发展思想研究

党的十九大明确作出“坚持和加强党的全面领导”的重大政治论断,并把它作为新时代“党的建设”总要求的首要观点、坚持和发展中国特色社会主义“基本方略”的第一条提出来,这是中国共产党人进行党建工作的基本指导和根本遵循。新时代,正确把握坚持和加强党的全面领导的逻辑理路至关重要,因为这是我们党与生俱来和新时代历史使命的必然要求,是我们党带领人民战胜敌人的强大法宝和克服一切困难风险的定海神针;是执政党持之以恒正风肃纪和紧锣密鼓反腐惩恶的内在需要和客观要求。     

论领导权结构、企业避税与会计信息可靠性的关系

以我国2013—2015年沪深两市A股类上市公司为样本,运用相关性分析和回归分析,以消除应计利润影响后的会计—税收差异作为衡量企业避税指标,用盈余激进度衡量会计信息可靠性,分析企业避税程度与会计信息可靠性的关系,并进行了稳健性检验。结果表明,企业避税程度对会计信息可靠性起负面作用。在此基础上,进一步梳理了领导权结构、企业避税与会计信息可靠性的关系,研究发现,相比两职合一的公司,企业避税程度对会计信息可靠性的负面作用主要体现在两职分离的公司。这对于深入研究企业避税与会计信息可靠性的关系具有一定的借鉴意义,可为完善公司治理机制、提高会计信息可靠性提供一定的思路借鉴和决策参考。     

日常生活领域的社会主义意识形态建设

社会结构变革和社会的开放化、市场化、信息化、网络化,既凸显了日常生活领域的社会主义意识形态价值,同时也对日常生活领域的社会主义意识形态凝聚力和引领力建设提出更多诉求。对此,应认真研究社会日常生活的发展变化,审慎思考日常生活领域对社会主义意识形态建设提出的各种诉求,积极加强社会主义意识形态的实践回应和自身建设。通过积极培育和践行社会主义核心价值观、凝聚社会各阶层各群体共同信仰、形成社会主义意识形态传播场域、加强社会主义意识形态的日常生活渗透等措施,增强社会主义意识形态的凝聚力和引领力,牢牢把握以马克思主义为指导的社会主义意识形态在整个社会生活中的领导权、主导权和话语权。     

A Narrative Approach to Pregnancy‐related Discrimination and Leader–follower Relationships

This study sheds light on women's perceptions of pregnancy‐related discrimination committed by the discriminated woman's immediate leader. The purpose is to show how women describe this perception during pregnancy and after their return to working life after maternity leave. Further, the study explores the ways in which the quality of the leader–follower relationship is revealed during the narration process. The research draws on five individual stories, collected in two rounds of interviews. Representations of several kinds of discriminatory practices can be found in the narratives and reveal that even being a partner in a good‐quality leader–follower relationship does not necessarily protect a woman from pregnancy‐related discrimination. However, women involved in a high‐quality leader–follower relationship described their perceptions in a more positive manner than those in a low‐quality relationship. The contribution of the article to the literature is twofold: firstly, the results challenge the traditional view that high‐quality leader–member exchange relationships lead to positive outcomes. Secondly, examining the different ways in which people describe their perceptions of discrimination deepens our understanding of the equality problems that working women face.     

包容性领导的探索性研究

包容性领导的概念正在成为研究的热点，目前对包容性领导的定义，学术界没有统一的认识，基于中国文化对包容性概念的理解，梳理包容性相关学术研究、文献，通过探索性访谈研究，对包容性领导的概念进行了定义，并提出包容性领导的价值。     

Understanding Popularity and Relational Aggression in Adolescence: The Role of Social Dominance Orientation

This study investigated a potential moderator of the association between popularity and relational aggression: social dominance orientation (SDO), the degree to which an individual endorses the importance of social hierarchy. One hundred eighty‐five ninth graders completed a sociometric assessment of RA and popularity, and a self‐report SDO measure. SDO was positively associated with popularity for both boys and girls, and with RA for girls. Popularity and RA were positively correlated for both genders. Regression analyses showed that SDO moderated the association between popularity and RA for girls, but not for boys. Girls who were both popular and who were social dominance‐oriented were particularly high in peer‐nominated RA. SDO may provide a useful framework for understanding the role of popularity in adolescent peer groups.     

改革开放以来中共领导集体法律思想研究述要

学界对改革开放以来中共三代领导集体核心——邓小平、江泽民、胡锦涛法律思想的研究主要集中在对其历史地位、历史意义、基本内容、基本特征及形成过程的概括和总结上，对三者的相互关系、它们对中国法制建设的影响及三者在中国特色社会主义法制思想形成过程中所做出的历史贡献缺乏整体性研究，需要今后进一步深入探讨。     

Partners,Institutions and International Currencies: The International Political Foundations for the Rise of the Renminbi

The use of an international currency is not just a natural market phenomenon; it relies heavily on international political foundations. The historical lessons of the four major international currencies—the pound, dollar, euro and yen—show that a strong partner network and a favorable international institutional environment are the two major political foundations for the formation of a stable international currency. The rise of the renminbi, as a late starter looking to become a major international currency, depends not only on the requisite economic conditions but on governmental diplomacy aimed at attracting more monetary cooperation partners and creating international institutions that support its worldwide use. This strategy reinforces the political foundations for the rise of the renminbi. Building a network of partners supporting the renminbi as an international currency and creating a system of international monetary institutions are the real tests of the issuing country’s political leadership. This political leadership capacity has three dimensions: public trust founded on reputation building; a centripetal force driven by provision of benefits; and coercive force applied through sanctions. Comparatively speaking, the renminbi is still in the early stage of its ascent, so the development of its political infrastructure should concentrate mainly on gaining public trust through reputation-building and employing centripetal force involving provision of benefits.