网络舆情的分数阶精细化建模与应用

[研究目的]在网络舆情从定性研究向定量研究的过渡过程中,精细化的数学建模对于揭示舆情传播规律、舆情趋势预测以及舆情科学管控等问题都具有重要的理论与实际意义。[研究方法]分数阶微积分学框架下,针对网络舆情系统构建可充分融和历史信息影响因素的分数阶微分方程模型,并借助分数阶导数的定义给出数学模型参数拟合方法,进而实现网络舆情系统更为精细的数学建模。[研究结论]以一类实际网络舆情事件为范例,通过分数阶数学模型的建立与基于数据的模型参数拟合,展示了基于分数阶微分方程建模方法的先进性与准确性,进一步降低了网络舆情系统整数阶数学建模方法的保守性。     

网络舆情研究中的仿真方法应用综述*

引入仿真方法进行网络舆情演化、引导机理的探索是近年来网络舆情研究的一个热点。在对我国网络舆情研究中仿真方法的应用状况进行文献梳理和评述的基础上,详细介绍了仿真方法的对象、建模理论与方法和相关仿真平台,探讨了当前的研究不足与未来的研究方向。     

网络舆情领域相关概念分布及其关系辨析

[目的/意义]当前学术界对网络舆情的概念内涵描述缺少规范、统一、明确的界定，对该领域的相关概念及其关系进行辨析有利于助推后续研究的发展。[方法/过程]在深入调查和比较现有文献的基础上，从网络舆情领域涉及的研究对象和概念分布入手，重点对网络舆情的研究对象、术语表达及其相互关系进行比较和辨析，并在综合当前研究环境下对网络舆情内涵表述进行广义性界定，同时对图书情报领域网络舆情研究的发展启示进行了分析。[结果/结论]有助于明晰网络舆情在不同学科或领域中边界与范畴。     

国内网络舆情研究的回顾与展望

舆情研究是新兴的社会科学与自然科学交叉的研究领域,网络舆情研究作为舆情研究的热点问题之一更是备受重视.网络舆情研究是舆情基础理论的重要组成部分,对其进行深入研究是对舆情基础理论的深化和扩展.本文通过分析我国网络舆情的研究现状,利用文献计量方法进行内容概括和分析,给出当前网络舆情研究的基本框架;然后对网络舆情研究内容进行分类研究,同时结合应用系统进行比较分析,从整体上把握我国的网络舆情研究和实践;最后探讨网络舆情研究存在的问题,并展望网络舆情的研究趋势.     

我国网络舆情研究的回顾与展望

运用计量统计的方法,首先对网络舆情近十年的相关研究进行文献统计,得出近些年网络舆情研究的总体概况。其次对近些年的网络舆情在研究内容上进行分类分析,主要通过对相关理论研究、网络舆情分析技术研究、网络舆情的应用及实践研究方面进行分析梳理,以从整体上把握近些年我国网络舆情的研究状况,最后,总结分析目前网络舆情研究中尚且存在的问题,并对未来的研究趋势进行展望,以期为网络舆情后续的相关研究提供借鉴和参考。     

基于人际关系网络的舆情演化建模研究

分析当前舆情建模研究现状,提出比较符合社会实际的人际关系网络模型,并对建立该网络模型的思路,网络节点的类型、属性和关系进行描述。在此基础上,根据不同节点类型设定了相应的舆情演化规则,建立了基于人际关系网络的舆情演化模型。     

我国网络舆情危机预警研究探讨

从分析我国网络舆情预警研究现状出发,利用文献计量法对内容进行概括和分析,给出当前网络舆情危机预警工作流程和研究框架,探讨网络舆情危机预警相关技术手段,结合应用系统比较分析,从整体上把握我国网络舆情危机预警研究和实践,最后讨论网络舆情危机预警中存在的问题,给出未来发展趋势.     

我国高校网络舆情的研究热点和前沿探析

【目的/意义】高校是网络舆情的聚集点和热源地,其舆情引导和治理,有利于防范和化解意识形态领域的 风险、凝聚社会共识、筑牢社会认同的思想基石。【过程/方法】通过社会网络分析方法,对2007-2020年高校网络舆 情研究的文献进行可视化分析,从时间分布、主要研究力量分布、高被引文献分析等方面,阐释高校网络舆情研究 的进展情况;通过施引文献的名词性术语、高频关键词知识图谱、聚类分析等,得出高校网络舆情研究的热点主题 及前沿趋势。【结果/结论】高校网络舆情的传播机制、风险评估及预警机制、舆论引导机制,舆情治理的形象修复与 弥合路径,舆情叙事模式转变与高校舆情应对机制,以及重大舆情事件的危机响应机制等,是未来研究的重要趋 势。【创新/局限】本文反映了国内学者对高校网络舆情研究的动态图景,但数据来源仅为中国知网收录的文献,难 以展现高校网络舆情研究的全貌。     

互联网舆情演化的动态网络模型研究

互联网舆情具有的衍生性、动态性和多维性特点,使得舆情的演化分析相当复杂。本文在分析舆情演化的微观组成及其演化特征的基础上,提出了舆情演化的动态网络模型,以期对舆情演化的动态过程和微观结构进行有效地描述。本文重点研究了动态网络模型的结构、演化特性和描述方法等建模理论。     

挖掘资源 开拓业务——《情报杂志》编辑部出版首部著作《网络舆情学》

网络舆情是近年来国内外兴起的前沿和热门研究主题。《情报杂志》在2008年即开始关注网络舆情方面的研究。6年来,《情报杂志》已经成为国内刊载网络舆情研究论文最多的杂志,并专门开辟了"舆情研究"专栏,成为国内网络舆情研究的重要阵地。刊载的论文从不同学科、不同视角,采用不同方法对网络舆情进行了全方位的研究。这些论文在一定程度上代表了国内的网络舆情研     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

To serve and promote science development via innovation

CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

Tracing the origin and early radiation of birds——Paleornithologist ZHOU Zhonghe

With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence