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[目的/意义]从在线健康社区用户兴趣的动态迁移性出发，将时间特征融入社交关系和个人偏好，完善在线健康社区个性化推荐算法，进一步提高用户获取健康信息的准确性。[方法/过程]首先，从用户社交关系出发，构建融入时间特征的用户影响关系网络；其次，依据用户个人偏好，构建融入时间特征的用户话题帖匹配矩阵；最后，将两者融合得到用户话题帖兴趣评分矩阵，据此形成每个用户的TOP-N推荐列表。[结果/结论]构建的融合时间特征的个性化推荐算法可提高推荐的准确度，提升在线健康社区个性化推荐算法的性能。 相似文献
2.
[目的/意义]探究社交网络中影响群体情感行为的影响因素，旨在为舆情引导提供参考。[方法/过程]首先，获取微博数据集，进行预处理后，使用结合AP算法及TF-IDF算法的LDA主题模型对用户文本进行聚类，挖掘用户兴趣主题；然后，人工识别结合接口调用对用户文本进行情感标注；最后，利用二元逻辑回归模型对假设的群体情感影响因素进行验证。[结果/结论]性别、主题及活跃度对于群体情感倾向有显著影响；男性群体普遍比女性群体消极；不同主题的情感主旋律不同。该结果对于网络舆情的控制以及个性化新闻推荐具有很好的借鉴作用。 相似文献
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[目的/意义]挖掘潜在好友关系并进行精准的好友推荐服务,已成为社交网络领域研究的热点,基于用户属性-关系相似度的好友推荐模型研究旨在增强用户忠诚度以及在线社区活跃度,提升社区的信息服务准确性和效率。[方法/过程]通过融合用户链接关系与属性特征,提出用户属性-关系相似评价体系;采用因子分析法,计算得出各项目权重以及综合得分;据此构建社交网络相似度矩阵,基于派系划分方法,对用户进行划分分区,最终实现好友推荐服务。[结果/结论]实验结果表明,运用派系划分的基于用户属性-关系推荐模型在推荐列表长度受限情况下的整体表现较优,有效提高推荐精准度。 相似文献
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[目的/意义]通过融合用户社交与情境信息,构建虚拟知识社区个性化知识推荐模型并开展个性化知识推荐算法的设计,能够在一定程度上完善虚拟知识社区个性化知识推荐方法的理论体系,具有一定的理论价值和应用价值。[方法/过程]首先构建出基于用户社交与情境信息的虚拟知识社区个性化知识推荐模型,然后利用改进的最大团算法设计出虚拟知识社区个性化知识推荐算法,最后通过选取某虚拟知识社区的用户数据进行实例分析实现精准的个性化知识推荐。[结果/结论]在利用融合用户社交与情境信息进行虚拟知识社区个性化知识推荐过程中,通过对某虚拟知识社区的实例分析,表明其个性化知识推荐结果的精准度得到了显著的提升。 相似文献
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[目的/意义]在社会化标注系统自组织运行的基础上，构建个性化信息推荐的多维度融合与优化模型，进而在大数据环境下，为用户提供精准的个性化信息推荐服务，从而进一步丰富个性化信息推荐的理论体系以及拓展个性化信息推荐的研究方法。[方法/过程]首先，对每一种个性化信息推荐方法的优点和不足进行深入分析；然后，将基于图论（社会网络关系）、基于协同过滤以及基于内容（主题）3种个性化信息推荐方法进行多维度深度融合，构建个性化信息推荐多维度融合模型；最后，对社会化标注系统中个性化信息推荐多维度融合模型进行优化，从而解决个性化推荐过程中用户"冷启动"、数据稀疏性和用户偏好漂移等问题。[结果/结论]通过综合考虑现有的基于图论（社会网络关系）、基于协同过滤以及基于内容（主题）的个性化信息推荐方法各自的贡献和不足，实现3种方法之间的多维度深度融合，并结合心理认知、用户情境以及时间、空间等优化因素，最终构建出社会化标注系统中个性化信息推荐多维度融合与优化模型。 相似文献
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[目的/意义]本文以用户行为感知视角，研究影响移动社交网络主导型用户与浏览型用户持续使用的因素，为移动社交网络信息服务提供理论基础，并为移动社交网络提供商提出参考与应用借鉴。[方法/过程]分析移动社交网络主导型用户与浏览型用户持续使用意愿影响因素，引入相关变量，构建了基于用户行为感知的移动社交网络信息服务持续使用意愿模型并提出假设，最后通过结构方程模型进行实证分析。[结果/结论]感知有用性、感知易用性、感知娱乐、感知质量等因素均显著影响主导型及浏览型两类用户；服务质量、感知风险、知识获取、个人创新、社会认可、感知信任、感知转换成本等因素对两类用户有不同程度的影响。 相似文献
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[目的/意义]为提高知识付费平台用户感知服务质量,文章构建了融合用户画像与协同过滤的个性化推荐模型。[方法/过程]首先根据用户特性构建画像标签体系,利用TF-IDF、熵值法、k-means等方法确定用户特征标签;其次分别基于用户画像与改进后的协同过滤算法计算用户相似度,通过调和权重得到用户综合相似度;最后利用Top-N进行个性化推荐。[结果/讨论]通过知乎live付费用户信息进行验证,发现本文算法在推荐结果的准确率以及召回率上,相比其单一方法均有较大提升,且满意度高于知乎live平台。 相似文献
8.
[目的/意义]为挖掘旅游平台游记文本蕴含知识，协助旅游者高效获取符合需求的信息和知识，为制定旅游计划提供科学决策的信息支持。[方法/过程]首先面向用户需求提出基于布尔矩阵和集合逻辑改进Apriori算法的思路；然后融合命名实体识别实现了游记文本关联知识挖掘及聚合，构建了基于关联知识挖掘的个性化推荐服务模式，并以携程网中杭州相关的游记文本进行了实证研究。[结果/结论]研究发现，融合命名实体识别和改进的Apriori算法，能够有效挖掘游记文本蕴含知识，实验结果验证了在算法性能及结果上要优于传统Apriori算法，并能够根据挖掘结果向用户提供个性化推荐服务，协助旅行者科学、高效地制定旅游计划。研究结论丰富了游记文本挖掘的方法论，为旅游平台服务推荐优化提供了新的思路。 相似文献
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【目的/意义】面对网络时代数据的海量性和无序性,为用户推荐个性化资源有利于增强用户间合作、提高
知识的共享速度,对新知识的发现具有深远意义。【方法/过程】基于具有相同兴趣用户的聚合优于单纯的信息聚
合,构建基于社会化标注系统的个性化推荐模型。通过引入社会网络中用户使用标签的频次来选择与用户关联显
著的标签,并通过加权派系发现和聚合“小众”凝聚组群和相似标签集,进而为用户推荐优质资源,使其真正契合用
户的个性化需求偏好。【结果/结论】结果表明模型能够有效实现信息的个性化推荐,消除单独聚类带来的粗糙数据
集,并通过抓取豆瓣上的数据进行实证分析。 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
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. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US 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 the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
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. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
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. 相似文献
14.
《中国科学院院刊(英文版)》2008,22(1):2-3
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. 相似文献
15.
《中国科学院院刊(英文版)》2008,22(1)
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." 相似文献
16.
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. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
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. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
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. 相似文献
19.
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.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
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. 相似文献
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Leah A. Lievrouw 《The Information Society》1998,14(2):83-96
The main premise of this article is that in information societies generally, and in virtual social contexts particularly, a distinctive style of interaction to facilitate the communication of difference, heterotopic communication , has emerged. It rests on two cultural foundations: an ideological belief in the positive, socially integrating power of communication, and a prevailing ethic of instrumental rationality, subjective individualism, and strategically practiced self-interest. The former is demonstrated by the use of simulation and spectacle as sources of information; exhibitionism/voyeurism as a communicative style; and the awareness of surveillance. The latter is seen in the competitive use of knowledge as a commodity; a surface globalism masking deep parochialism; lateral as well as vertical information inequity; and the use of public versus private as strategies for engagement rather than as spaces. Those who engage in heterotopic communication resort to their 'own devices' both in the sense of personal agendas, strategies, interests, and interpretations, and in the form of the telecommunication tools that help realize them. These personal and technological devices allow individuals with the right educational and technical resources to avoid exposure to disagreement, difference, or other information that does not serve their direct purposes or reflect their particular views of the world; yet they also help convey the appearance of openness, availability, and cooperation. This style of interaction is used strategically in combination with information and communication technologies to gain social or economic advantages, but it may encourage social separatism and parochialism, inhibit the negotiation of disputes, and emphasize competing interests. 相似文献