基于不完全价值链分析的国内外两种典型OA仓储比较研究

价值链分析方法应用于OA仓储比较研究,以迈克尔·波特的价值链理论为指导,并结合OA仓储本身的特殊性,对OA仓储价值链进行了分析和提炼,并从可比性原则出发,围绕OA仓储价值链中的基本价值活动,对中国科技论文在线和arXiv.org的运作差异性进行了比较研究,在此基础上对中国科技论文在线提出了六点发展建议。     

Extended Poisson INAR(1) processes with equidispersion,underdispersion and overdispersion

Real count data time series often show the phenomenon of the underdispersion and overdispersion. In this paper, we develop two extensions of the first-order integer-valued autoregressive process with Poisson innovations, based on binomial thinning, for modeling integer-valued time series with equidispersion, underdispersion, and overdispersion. The main properties of the models are derived. The methods of conditional maximum likelihood, Yule–Walker, and conditional least squares are used for estimating the parameters, and their asymptotic properties are established. We also use a test based on our processes for checking if the count time series considered is overdispersed or underdispersed. The proposed models are fitted to time series of the weekly number of syphilis cases and monthly counts of family violence illustrating its capabilities in challenging the overdispersed and underdispersed count data.     

Kiva's Flat,Flat World: Ten Years of Microcredit in Cyberspace

While microcredit has been widely praised as a new, powerful tool for enabling development and empowering the poor, this form of ‘development from below’ does not exist in a vacuum. Rather, microcredit programs are inseperable from a host of neoliberal political, cultural, and economic practices and projects. These contexts are, however, systematically missing from Kiva.org, the largest and most popular peer-to-peer microlending portal. Instead, Kiva.org presents a placeless perspective on development and poverty, where borrowers’ skin color, native dress, and picturesque backgrounds seem to vary, but the ‘fix’ of microcredit remains universal. This ‘flat’ approach is problematic for two reasons. First, Kiva.org naturalizes the financialization of poor people's disadvantage in the coercive form of debt. Second, lenders are encouraged to channel their desire to help alleviate poverty through Kiva.org's lending portal based on an illusory sense of connection, transparency and beneficence in lending, thus potentially displacing other forms of less problematic development aid and intervention.     

一项关于句酷批改网在大学英语写作教学中的应用研究

当前在国内多所高校正在推广使用句酷批改网,本研究拟以江西省某高校师生的句酷批改网使用情况为研究对象,采用问卷调查,作文样本分析和访谈等研究手段来探讨在线写作自动评改系统在英语写作教学的运用,分析其在英语写作教学中的使用效果、适用性与局限性,并针对其不足之处提出句酷网的软件改进建议和构建一个多元写作评改机制.     

英语写作水平的影响

通过对89名不同英语水平的非英语专业学生英语写作调查发现,经过一段时间的批改网写作练习,较高水平学习者和一般水平学习者的英语写作成绩都显著提高。作文字数明显增加,高频词汇量显著减少,学术词汇量明显增加;在平均词长方面,一般水平学习者有所下降,较高水平学习者略有增加,但是,都没有形成显著性差异;在篇章连词的使用上,虽然两者都略有增加但未形成显著性差异;从句的使用上,一般水平学习者小幅度增加,而较高水平学习者略微减少;平均句长、最长句词数及最短句词数上,较高水平学习者都略有减少,而一般水平学习者在最长句词数上略微增加,在最短句词数及平均句长方面都稍有减少。可见,通过批改网进行写作练习,一般水平学习者进步更明显。在练习过程中,教师应该从连词、从句的使用及句法等薄弱环节上加强对学习者的指导。