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1.
针对传统关联规则挖掘算法中频繁信息不完善,以及电子商务中各个影响因素贡献值不同的问题,提出一种基于矩阵多源加权关联个性化推荐模型——MSWPR模型,并在考虑虚拟行为水平加权和多源关联垂直加权的基础上,引入最小支持数概念作为剪枝的依据,进一步结合该模型对个性化推荐流程进行了概述。 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
3.
为适应图书馆新书推荐服务的需要,以安徽省图书馆为例,用数据挖掘中的关联分析技术对安徽省图书馆的借阅记录进行挖掘,提出读者推荐服务模型,利用挖掘出来的关联规则进行读者个性化推荐服务. 相似文献
4.
为适应图书馆新书推荐服务的需要,以安徽省图书馆为例,用数据挖掘中的关联分析技术对安徽省图书馆的借阅记录进行挖掘,提出读者推荐服务模型,利用挖掘出来的关联规则进行读者个性化推荐服务。 相似文献
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为适应图书馆新书推荐服务的需要，以安徽省图书馆为例，用数据挖掘中的关联分析技术对安徽省图书馆的借阅记录进行挖掘，提出读者推荐服务模型，利用挖掘出来的关联规则进行读者个性化推荐服务。 相似文献
6.
阐述和分析了数据挖掘中关联规则的算法，提出了在数字图书馆中构建推荐系统模型。本文采用Apriori算法，并根据实际的应用对算法进行改进，克服算法弱点，提高推荐精度，实现数字图书馆的个性化服务。 相似文献
7.
基于多Agent的电子商务个性化推荐系统模型研究 总被引：1，自引：0，他引：1
针对现有推荐系统缺乏智能性、自适应性、主动性等处理能力的局限性，采用多Agent技术并结合Web日志挖掘技术，将传统的个性化推荐系统中的功能模块构建为智能体，提出了一个基于多Agent的电子商务个性化推荐系统（MAPRS）的整体架构模型，并讨论了模型中各组成部分的功能与系统的运作流程。 相似文献
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【目的/意义】大数据情报分析和知识服务时代,如何快速高效地从海量文献中获取情报并实现精准的文献 个性化推荐,是文献推荐个性化服务亟待解决的问题。【方法/过程】对文献个性化推荐模型进行研究,通过专家权 重维、用户维以及情境感知维三个维度的协同,识别用户的兴趣点。推荐模型使用层次分析法和熵权法量化专家 意见;使用潜在狄利克雷分布和KL散度计算量化用户相似度;通过用户社会标注行为、搜索行为、浏览行为得到用 户情感倾向,并引入时间因子量化用户情感;最后引入“最大频度值”确定各个维度的推荐指数,加权计算得到文献 综合推荐指数。【结果/结论】以高校图书馆为实验平台,对本文提出文献个性化推荐方法进行验证。实验结果表 明,与传统的基于内容的推荐方法、协同过滤推荐方法以及混合的推荐方法相比,基于三层维度的文献个性化推荐 方法在准确率与召回率上都取得了更好的性能。 相似文献
9.
[目的/意义]将情境感知技术引入图书馆以提高服务的智能化，已成为数字图书馆的发展趋势之一。为了提高情境感知模型中推荐结果的准确度。[方法/过程]本文研究并提出了一种融合了朴素贝叶斯算法与情景感知功能的协同推荐模型，并通过实验对推荐效果进行了评估。具体为：首先，获取用户的当前任务和情景信息，同时提取历史信息库用户的行为偏好；其次基于属性加权贝叶斯算法计算用户的行为相似度，继而进行协同推荐；通过计算目标情景中所有情景属性对所推荐资源的影响的权值，对协同推荐所得评分进行加权处理，形成最终的预测预测；最后通过实验对模型进行检验。[结果/结论]结果表明：使用该模型得出的推荐结果优于传统的协同推荐结果。因此该模型能够更好地为为个性化信息服务提供支持。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
《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
13.
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
14.
《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
15.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
16.
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
17.
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
18.
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
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
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