语言学习环境对英语学习的影响

本文探讨了语言学习环境对英语学习的影响 ,其目的是引导学生去发现英语学习规律 ,获得运用英语的能力。     

碎片·场景·沉浸——由互联网+短视频看未来电影制作的发展趋势

互联网2.0时代的媒介特性要求传播内容应具有碎片化、场景式与沉浸式的特点。短视频又短又快的传播形式,恰是互联网对传播内容碎片化要求的体现;以趣缘聚类组织的垂直内容,暗合场景式传播的要求;视频制作技术的进步,成为沉浸式的视听体验的技术支持。由此可以窥见未来电影的发展图景,即更短的电影时长和镜头长度、依大数据算法决策的电影制作以及仿真的沉浸式的视听体验。     

Some Results on Modeling Biological Sequences and Web Navigation with a Semi Markov Chain

In the article, the entrance probabilities and the probability distribution of the number of transitions to a state are studied to provide some answers to questions related to state occupancies for the semi Markov model. Biological sequences and Web navigation are two cases that initially seem to be different but to a certain extent they do have similarities. Two main aspects of word occurrences in biological sequences are: (a) where do they occur and (b) how many times do they occur. In Web navigation the similar questions are (a) when a node is visited and (b) how many times a node is visited. So, the theoretical results of this study are applied to model these two cases and derive distributions of word location or node occurrence and frequency of occurrences. Rewards/costs are included in the Web navigation model and analytic forms for the means, variances, and moments of total interval rewards/costs are provided.     

大数据背景下网络调查样本的建模推断问题研究——以广义Boosted模型的倾向得分推断为例

随着大数据和网络的不断发展，网络调查越来越广泛，大部分网络调查样本属于非概率样本，难以采用传统的抽样推断理论进行推断，如何解决网络调查样本的推断问题是大数据背景下网络调查发展的迫切需求。本文首次从建模的角度提出了解决该问题的基本思路：一是入样概率的建模推断，可以考虑构建基于机器学习与变量选择的倾向得分模型来估计入样概率推断总体；二是目标变量的建模推断，可以考虑直接对目标变量建立参数、非参数或半参数超总体模型进行估计；三是入样概率与目标变量的双重建模推断，可以考虑进行倾向得分模型与超总体模型的加权估计与混合推断。最后，以基于广义Boosted模型的入样概率建模推断为例演示了具体解决方法。     

Institutionalized collective action and the relationship between beliefs about environmental problems and environmental actions: A cross-national analysis

How do institutions affect the relationship between an individual's beliefs and their actions? Institutionalized strategies are routine ways of addressing problems that become taken-for-granted in a society. Environmental problems constitute a collective action problem in that personal consumption often conflicts with collective interests. I test whether beliefs about environmental problems have a different impact on a person's pro-environmental behaviors, depending on how addressing collective action problems is institutionalized in their society. In particular, I use level of welfare targeting as an observable, organizational difference among societies that reflects different institutionalized strategies for addressing a prominent collective action problem. I use multilevel models on data from the 2010 International Social Survey Programme (ISSP) and measures of welfare targeting from the Organization for Economic Cooperation and Development (OECD) to answer this question. I find that in societies where the institutionalized strategy for dealing with inequality is highly targeted, individuals' beliefs that these problems are important, real, and whether they can do something about them have a greater impact on their actions. The results suggest individuals generalize taken-for-granted strategies of assuring collective welfare to implement their individual beliefs about the environment, making institutional environments important moderators of the strength of the belief-action relationship.     

Developing spatial inequalities in carbon appropriation: A sociological analysis of changing local emissions across the United States

This study examines an overlooked dynamic in sociological research on greenhouse gas emissions: how local areas appropriate the global carbon cycle for use and exchange purposes as they develop. Drawing on theories of place and space, we hypothesize that development differentially drives and spatially decouples use- and exchange-oriented emissions at the local level. To test our hypotheses, we integrate longitudinal, county-level data on residential and industrial emissions from the Vulcan Project with demographic, economic and environmental data from the U.S. Census Bureau and National Land Change Database. Results from spatial regression models with two-way fixed-effects indicate that alongside innovations and efficiencies capable of reducing environmentally harmful effects of development comes a spatial disarticulation between carbon-intensive production and consumption within as well as across societies. Implications for existing theory, methods and policy are discussed.     

Statistical issues in developing indicators of sustainable development

This paper describes the background to the development of a new official set of national indicators of sustainable development—one of the first in the world to be published. The paper discusses the role of statisticians in helping to define sustainable development, and the problems of monitoring and reporting progress. The Minister of State for the Environment has announced his ambition of developing a very small set of headline indicators. This paper is intended to help to stimulate the debate over what they should be.     

网络传播中社会情绪表达问题研究

当个体的人的喜怒哀乐诸种情绪汇集而成为众多人的一种共同性情绪特征时,这就演化成了社会情绪。在传统大众传媒领域,一种社会情绪的汇集与表达难度是相当大的,因为要受到这些媒体把关人的审视和调控,但当网络媒体出现、兴起后,社会情绪借助这一媒介平台其表达、传播、汇集就变得十分容易,由此带来的社会影响也很大,对社会的运行有时能起到积极的推波助澜的作用。当然,有的社会情绪的消极作用也同样会出现。这就产生了网络传播时代社会心理学中的一个新问题,即网络传播中的社会情绪表达。对这一问题的提出和研究,应该引起相当的重视,因为它关乎网络传播本身运行的量与质,也关乎社会的和谐和稳定。     

Using the End‐User Computing Satisfaction (EUCS) Instrument to Measure Satisfaction with a Web Site

The purpose of this study is to revise and revalidate the End‐User Computing Satisfaction (EUCS) instrument to measure satisfaction with a Web site from a usability perspective. This study is especially important given the increased significance of the Web and the uniqueness of the Web as a computing environment. A total of 176 students participated in a lab simulation that involved a usability evaluation of the Lands' End Web site ( http://www.landsend.com ). Students were asked to complete a set of tasks, record their answers, and then complete the EUCS instrument. Confirmatory factor analysis and invariance analyses were conducted to test the reliability, validity, and generalizability of the revised EUCS. The results show that the EUCS is a valid and robust instrument in the Web environment but that one of the subfactors, timeliness, will need further refinement in the future. Usability practitioners can use the EUCS to measure end‐user satisfaction with a Web site and use the feedback for improving Web‐site design. We describe a case study of an actual usability application that utilized the revised EUCS effectively to support the design of building supply Web sites involving two types of end users, homeowners and contractors. We also propose a typology that researchers can use as a starting point to judge when it is necessary to revalidate an instrument like the EUCS. Finally, we discuss the limitations of our study and present avenues for future research.     

黎族民歌语境下的日常生活

黎族民歌是黎族人民日常生活的反映,是一扇窥视黎族社会经济、文化发展轨迹的窗口。