共查询到20条相似文献，搜索用时 60 毫秒
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[目的/意义]用户利用在线医评信息是网络医疗服务的关键环节，探索医评信息特征如何影响用户采纳行为有助于促进在线医疗平台的优化和服务发展。[方法/过程]基于ELM模型和信任转移理论，采用2*2*2的组间实验设计方法开展情景决策实验，收集有效问卷539份，并利用Smart PLS开展直接效应、中介效应和调节效应分析。[结果/结论]事实型(vs抽象型)评论和真实姓*(vs昵称)的评论人标识可以提升感知内容客观性和具体评论人可信度，并进一步提升用户对评论的有用性感知和后续采纳意愿。对网站的信任可以通过一般评论人群体信任向具体评论人信任进行转移。用户性别特征和疾病严重程度特征分别负向和正向调节评论特征对用户认知及后续采纳的影响。研究提出的措施可以帮助在线医疗平台优化设计以促进用户对医评信息的采纳利用。 相似文献
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[目的/意义]针对我国在线用户评论习惯，探索用户评论行为对评论时间的影响作用因素，对电子商务运营商探究用户评论行为规律及探索潜在用户评论时间偏好具有重要的潜在商业价值。[方法/过程]基于TAM模型抽取在线用户评论行为时间特征规律研究的影响因素并构建模型，通过抽取消费者购买行为和评论行为的时间间隔为时间序列，通过多元线性回归模型进行假设验证。[结果/结论]通过对在线评论数据的实例验证，本文所构模型能够很好地发现在线用户评论行为对评论时间的影响作用关系，对消费者评论行为的时间特征规律发现和预测具有辅助作用。 相似文献
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[目的/意义]理解用户需求是企业管理实践中的重要一环,在线评论作为用户偏好表达的重要渠道,是企业发现用户需求的重要数据来源。因此,如何从在线评论中有效挖掘出用户需求,是一个重要的研究问题。[方法/过程]文章构建了一个基于KANO模型、面向在线评论的用户需求分析框架。首先利用LDA主题模型从在线评论中抽取商品属性,然后基于BERT模型标注出不同属性上的评论短句,并对其进行情感分析,最后依据不同属性上的评论短句与情感分析结果,通过KANO模型分析用户属性需求。以手机评论数据为例对模型进行验证。[结果/结论]将商品属性分为必备属性、期望属性、魅力属性与无差异属性四类,并以可视化结果呈现。实验结果表明面向在线评论的用户需求分析框架能够有效提取在线评论中用户的属性需求信息,为企业提供产品改进策略参考。[局限]样本数据集有限,存在不均衡状况。 相似文献
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基于元分析的在线学习用户使用行为研究 总被引：10，自引：1，他引：9
[目的/意义] 为发现不同研究背景中在线学习用户使用行为的普遍规律,消除研究时间、调查样本等带来的影响,归纳和梳理该领域的研究结论。[方法/过程] 采用元分析方法对国内外在线学习用户使用行为研究的64篇文献,21 227个独立样本进行综合分析。[结果/结论] 研究结论发现共有25个因素与在线学习用户使用行为显著相关,其中强度相关因素主要集中在用户、系统两方面,中度相关有社会影响方面,弱相关因素并未出现。具体而言,影响最大的是使用态度、感知便利性和感知娱乐性,影响较弱的是个人创新、计算机焦虑和信息质量,感知自主性和服务质量没有显著影响。同时,针对研究结果,结合在线学习平台的现状,从用户、系统和社会方面提出了优化在线学习服务的建议。 相似文献
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[目的/意义]理解用户需求是企业管理实践中的重要一环,在线评论作为用户偏好表达的重要渠道,是企业发现用户需求的重要数据来源。因此,如何从在线评论中有效挖掘出用户需求,是一个重要的研究问题。[方法/过程]文章构建了一个基于KANO模型、面向在线评论的用户需求分析框架。首先利用LDA主题模型从在线评论中抽取商品属性,然后基于BERT模型标注出不同属性上的评论短句,并对其进行情感分析,最后依据不同属性上的评论短句与情感分析结果,通过KANO模型分析用户属性需求。以手机评论数据为例对模型进行验证。[结果/结论]将商品属性分为必备属性、期望属性、魅力属性与无差异属性四类,并以可视化结果呈现。实验结果表明面向在线评论的用户需求分析框架能够有效提取在线评论中用户的属性需求信息,为企业提供产品改进策略参考。[局限]样本数据集有限,存在不均衡状况。 相似文献
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【目的/意义】网络用户在线评论是用户对某产品或服务机构体验感知的反馈,对网络用户在线评论的文
本挖掘是情报分析的重要内容。【方法/过程】为了更有效从海量网络用户在线评论文本中挖掘用户感兴趣的信息,
本研究爬取TripAdvisor网站四大城市的酒店用户在线评论,基于主题图谱理论和文本聚类算法构建网络用户在线
评论的聚类模型,通过图谱可视化揭示不同地区酒店用户观点差异,并分析不同图谱的社会网络特征。【结果/结
论】研究发现酒店用户最关注的是服务,其次是酒店的环境和位置。本研究能够快速挖掘酒店用户关注内容,对帮
助酒店管理者了解用户住宿需求并以此提高用户满意度具有重要价值。【创新/局限】本文结合主题图谱和文本挖
掘技术构建酒店用户在线评论主题图谱,在大数据文本主题聚类上显示出优越性。但本文仅分析TripAdvisor网站
四个城市中部分酒店的用户在线评论,数据面覆盖不够广泛。 相似文献
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[目的/意义]研究了大数据环境下个体投资者的信息获取行为偏好,探索新媒体环境对个体投资用户的决策影响。[方法/过程]基于开放式股票投资在线社交网络（OSN）的视角,分析、确定个体投资用户的主要信息获取行为,以及影响个体投资决策的两个重要因素;通过问卷调查收集相关数据,提出研究假设,进行数据分析,并运用回归分析方法进行假设检验,分析个体投资者决策的信息获取行为偏好。[结果/结论]研究发现：不同个体投资者对信息获取行为的选择存在明显差异;并且个人分析能力不同的投资者的行为偏好存在差异;个性化推荐是对个体投资者决策具有较大影响作用的信息获取行为。 相似文献
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[目的/意义]内容质量对于在线知识社区至关重要,研究贡献者身份对用户内容质量感知的影响关系,可有效提升社区价值并为社区管理提供参考。[方法/过程]基于在线社区用户身份交流理论和内容质量感知的双过程理论,提出相关研究假设和理论模型,并基于实验素材选取、用户调查和统计分析,探索其影响机理。[结果/结论]单因素方差分析结果表明：贡献者身份的专业认证程度对用户感知内容质量没有显著影响;贡献者专业身份标识等级对内容质量感知有显著影响,平均标识等级越高,用户感知内容质量越高。 相似文献
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[目的/意义]社会化在线评论与传统的专业性评论相比,具有更为显著的传播速度和影响力。文本评论中的情感因素并非单纯的数量化评分能够完全体现的。对本文评论中情感因素的测量与分析,能够有助于在线评论的全角度识别与揭示,更加客观准确地反映在线评论的价值。[过程/方法]通过提取用户发布的在线文本评论数据,采用有监督机器学习的算法,分别计算文本评论的情感分类得分、情感倾向得分、综合情感得分。从类型、地区、人数多个维度对情感得分与总评分进行交叉对比分析。[结果/结论]研究结果表明,文本评论蕴含的情感因素对总评分具有部分的影响作用。用户的认知偏好、社会文化背景和评论人数占比会对情感因素的有用性产生影响。 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
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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
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.
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
17.
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
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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.
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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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