5次交错群A_5的10阶子群的一个构造方法

A5的元最大阶数是5,使用有限群的Lagrange定理,A5的10阶子群元的阶只可能是2,5。但由于拉格朗日定理的逆不成立,因此是否存在A5的10阶子群仍是问题。该文通过对5-循环置换各次方幂的计算及其研究,找到A5的10阶子群元的构成规律,并使用构造性方法给出了5次交错群A5的6个10阶子群。     

屈原与五月五日--端午的渊源及意义

春秋战国各国历法不一,五月五日禁忌原是北方晋、齐等国的习俗,后来才影响到全国,它原本与屈原没有关系.在汉末至南北朝时期,北方厌胜之术与南方救屈原结合起来,才形成了完整的端午节风俗.作为端午节重要内容之一的竞渡在唐代风行于南北,端午风俗在唐代才基本定型;端午使屈原永远活在民俗和民间文化中.     

Vietnam’s economy: Achievements and perspective

In last several years, Vietnams economy has reached significant achievements. Those are clearly seen by analyzing economic growth, economic structure transformation, trade and investment and Vietnams economy competitiveness. However, in the process of development, Vietnams economy is still facing many difficulties and challenges. Vietnam is accelerating speed of innovation process, is active and quicker in international economic integration in order to complete the economic – social objectives in the period of 2001–2005 with annual average economic growth rate of 7.5%.     

The empirical analysis of the -bilateral optimized combinatorial auction model

This study proposes a new and highly efficient dynamic combinatorial auction mechanism—the N-bilateral optimized combinatorial auction (N-BOCA). N-BOCA is a flexible iterative combinatorial auction model that offers more optimized trading for multiple suppliers and purchasers in the supply chain than one-sided combinatorial auction. We design the N-BOCA model from the perspectives of market architecture, trading rules, and decision strategy for winner determination, the decision strategy for winner determination needs flexible optimization modeling capability. Thus rule-based reasoning was applied for reflecting the flexible decision strategies. We also show the viability of N-BOCA through Paired Samples T-test experimentation. It shows that N-BOCA yields higher purchase efficiency and effectiveness than the one-auctioneer to multi-bidders (1-to-N) combinatorial auction mechanism.     

A two phases queueing system with Bernoulli vacation schedule under multiple vacation policy

This paper deals with a single server Poisson arrival queue with two phases of heterogeneous service along with a Bernoulli schedule vacation model, where after two successive phases service the server either goes for a vacation with probability p (0≤p≤1) or may continue to serve the next unit, if any, with probability q(=1−p). Further the concept of multiple vacation policy is also introduced here. We obtained the queue size distributions at a departure epoch and at a random epoch, Laplace Stieltjes Transform of the waiting time distribution and busy period distribution along with some mean performance measures. Finally we discuss some statistical inference related issues.     

THE INEFFICIENCY OF WORKER TIME USE

Much work is carried out in short, interrupted segments. This phenomenon, which we label task juggling, has been overlooked by economists. We study the work schedules of some judges in Italy documenting that they do juggle tasks and that juggling causally lowers their productivity substantially. To measure the size of this effect, we show that although all these judges receive the same workload, those who juggle more trials at once instead of working sequentially on few of them at each unit of time, take longer to complete their portfolios of cases. Task juggling seems to have no adverse effect on the quality of the judges' decisions, as measured by the percent of decisions appealed. To identify these causal effects we estimate models with judge fixed effects and we exploit the lottery assigning cases to judges. We discuss whether task juggling can be viewed as inefficient, and provide a back‐of‐the‐envelope calculation of the social cost of longer trials due to task juggling.     

国外企业社会责任对消费者购买意向影响研究综述

国外学者对企业社会责任(CSR)影响消费者购买意向的研究,主要是从下列三个方面展开的:一是结合企业内部相关信息,包括企业形象和声誉、伦理道德、企业能力、企业绩效和产品信息等;二是结合消费者特征,包括消费者的个体和群体特征、消费者主观维度;三是结合CSR具体内容及属性,包括CSR的信息来源、数量和传播途径等.研究的不足则主要表现在较少考虑行业特征、很少涉足影响的程度、未形成完整的理论体系和实用的研究模型等,这是在今后研究中应加以改进的地方.     

基于EQ-5D量表的农村已婚育龄妇女健康相关生命质量评价

目的：评价农村已婚育龄妇女的生命质量,探索影响其生命质量的主要因素,提出相关政策建议。方法：应用欧洲生命质量量表（EQ-5D）的五维度测量体系及直观式健康量表（VAS）进行评价。结果：已婚育龄妇女的总体健康状况优于一般人群,妇科疾病是妇女的主要健康问题,在婚、受教育程度高且无慢性妇科病的已婚育龄妇女生命质量较高。结论：已婚育龄妇女要增强自身健康意识、调整好来自家庭与工作的压力。政府应该定期开展妇女病的普查工作,加大对女性受教育问题的重视,采取相应的政策措施,以提高妇女的生命质量。     

全媒体时代主流媒体的数据化生存与发展

基于互联网连接的媒体平台,正在成为各类原生数据的源发地和汇聚中心,对大数据进行整合及应用的能力,将成为未来媒体平台运营的核心能力。建构在互联网平台之上的主流媒体必然要经历从信息总汇向数据总汇的转变,在这一过程中,媒体的业态、社会功能都将发生重大变化。伴随全媒体时代信息技术的快速发展,新闻传播呈现出新的特点和规律：传播主体大众化;传播容量海量化;传播方式交互化;传播手段多维化;传播时效全时化。在这样的背景下,主流媒体应不断进行数据化的探索和创新,基于5G网络,通过大数据技术运用,强化数据库建设,以此为基础,运用基于大数据的人工智能技术改变内容生产和分发方式,并以之作为内容监管的有力武器。未来基于大数据分析的综合业务推动自身产业结构优化。