农超对接模式中的合作博弈问题研究

本文在需求函数中引入“合作社为提高每单位农产品质量而付出的努力成本”这一变量,利用非合作博弈中的Buyer-Stackelberg模型、Seller-Stackelberg模型和合作博弈模型对比研究了农超对接模式下超市与合作社在竞争、合作时农产品质量安全水平、零售价格和市场需求量的差异,得出了合作博弈模式能够提高农产品质量安全水平,降低农产品零售价格,并扩大农产品市场需求量三个结论.最后,本文的算例结果显示,农超对接的合作博弈不仅能实现以上结论,还能够提高整个供应链的利润.对关键参数进行灵敏度分析发现,当消费者对农产品零售价格越不敏感而越关注农产品质量安全时,合作博弈的解就越优于非合作博弈.     

虚拟社区知识共享主体对首购意愿的作用机理研究

虚拟社区知识共享的匿名性和互动性特征使知识共享过程中共享主体的影响尤其显著.以有过虚拟社区知识共享经历的消费者为样本,探讨虚拟社区知识共享对消费者首购意愿的作用机理,分析知识共享主体特征对消费者感知风险的影响以及消费者感知风险对消费者首购意愿的作用;通过在网上论坛发放电子问卷、滚雪球和街头拦截的形式回收有效问卷366份,采用多元线性回归和层次线性回归对假设进行检验.研究结果表明,共享主体的特征可以划分为发送者专业能力、关系强度和发送者社区地位3个维度,这3个维度通过感知风险正向影响首购意愿,产品涉入度对共享主体与感知风险的负向关系产生显著的正向调节作用.该结论为企业在虚拟社区进行有效的口碑营销及危机公关提供决策支持.     

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.     

文官政治·书卷风流·人文气象--宋代文学存在的社会文化背景分析

有宋一代 ,文化大昌 ,文学也出现繁荣气象 ,这同宋代的社会环境及文化背景密切相关。宋型文化 ,有着向内收敛及注重人文涵养的倾向 ,这也深深影响了宋代文学及文学思想。简言之 ,宋代社会的基础是文官政治 ,内在精神是注重品性涵养 ,外在的表现是书卷风流。它们三位一体 ,构成了宋人所处的富于浓郁人文气息的氛围 ,其审美情趣也从外在的羁旅漫游、征戍迁谪、行旅离别 ,逐渐转向丰富多彩的心智活动 ,于是构成宋代文学及文学思想中博大精深的人文气象     

论医学专业研究生的英语视听说教学

文章以认知语言学理论为基础,基于对语言产生模式以及图式理论的探讨,从教学内容,课堂活动以及评估测试几个方面来试图建立一个面向医学专业研究生的可行的视听说教学模式。因为语言学习也是一种认知过程,所以教学模式应该以认知为基础,以学生为中心(学生是认知的主体)。在选择教学内容,设计课堂活动以及进行测试评估时都应该以认知发展的规律为指导。     

分析师利益与投资建议的信息含量

 内容提要:本文分析了证券分析师的利益和我国证券分析师投资建议的信息含量。本文发现,证券分析师投资建议大多为“买入”或“中性”建议,而“卖出”建议却很少。通过对投资建议发布日附近股票超额回报率和超常交易量的研究,本文发现“买入”、“卖出”建议分别会引起股价的永久性上涨和下跌,而“中性”建议不会对股价产生显著影响。此外,被建议“买入”和“卖出”的股票的交易量也会明显地增加,特别是在建议发布的当日。这些现象说明,投资者认为分析师的建议包含了有价值的信息,因而相应地调整了对未来收益的预期以及当前最优的持股数量。股票交易的活跃给证券公司带来了佣金收入,作为对他们向市场传递有价值信息的回报。     

Problem‐ and solution‐focused characteristics of parenting support, 3 years after implementation of the solution‐focused approach: A qualitative content analysis

In recent years, solution‐focused parenting support has been developed and implemented as a promising brief and strength‐based approach. Given the fundamental differences between solution‐focused and the historically more common problem‐focused parenting support and the complexity of transforming professional practice, an actual shift towards solution‐focused parenting support can be expected to be limited up to now. However, because research into the specific communication characteristics of professional parenting support is currently lacking, no conclusion can be drawn at present. Therefore, this study aims to explore the current problem‐ and solution‐focused characteristics of parenting support in the Dutch youth healthcare (YH). In total, 15 support sessions performed by 10 public health nurses were audio recorded and transcribed verbatim. A detailed qualitative content analysis of professional communication was conducted to identify problem‐ and solution‐focused factual, expressive, relational and appealing aspects of parenting support. Problem‐focused characteristics dominated all sessions of parenting support. This study is the first to thoroughly analyse the problem‐focused and solution‐focused communication characteristics of professional parenting support using a qualitative content analysis. Parenting support practice in the Dutch YH did not shift substantially to a solution‐focused approach. More effort is required to stimulate and facilitate this professional transformation.     

Attenuating Initial Beliefs: Increasing the Acceptance of Anthropogenic Climate Change Information by Reflecting on Values

Anthropogenic climate change information tends to be interpreted against the backdrop of initial environmental beliefs, which can lead to some people being resistant toward the information. In this article (N = 88), we examined whether self‐affirmation via reflection on personally important values could attenuate the impact of initial beliefs on the acceptance of anthropogenic climate change evidence. Our findings showed that initial beliefs about the human impact on ecological stability influenced the acceptance of information only among nonaffirmed participants. Self‐affirmed participants who were initially resistant toward the information showed stronger beliefs in the existence of climate change risks and greater acknowledgment that individual efficacy has a role to play in reducing climate change risks than did their nonaffirmed counterparts.     

Is Tattooing a Risk Factor for Adolescents’ Criminal Behavior? Empirical Evidence from an Administrative Data Set of Juvenile Detainees in Taiwan

Juvenile crime affects not only the victims of the crime but also the delinquents’ future. How to prevent adolescent criminal behavior has become an important public policy issue. This study contributes to this interesting issue by examining the relationship between tattooing and adolescents’ criminal behavior. In particular, this study investigates whether or not having a tattoo/tattoos is connected to the incidence of various criminal activities, including: larceny, robbery, fraud, assault, drug use, and homicide. A unique sample of 973 juvenile detainees drawn from the administrative profiles in Taiwan and the coarsened exact matching method were utilized. Results show that compared to their nontattooed counterparts, tattooed juvenile detainees were significantly more likely to commit fraud, assault, drug abuse, and homicide by 3%, 13%, 9%, and 9%, respectively. In contrast, tattooing was not significantly associated with larceny or robbery. From a policy perspective, given the significant link between tattooing and criminal behavior, the presence of a tattoo in adolescents may serve as a valuable indicator regarding adolescents’ high probability of committing crimes.