共查询到20条相似文献，搜索用时 625 毫秒
1.
Abstract This study considers a model of a TV oligopoly where TV channels transmit advertising and viewers dislike such commercials. It is shown that advertisers make a lower profit the larger the number of TV channels. If TV channels are sufficiently close substitutes, there will be underprovision of advertising relative to social optimum. This study also finds that the more viewers dislike ads, the more likely it is that welfare is increasing in the number of advertising-financed TV channels. A publicly owned TV channel can partly correct market distortions, in some cases, by having a larger amount of advertising than private TV channels. It may even have advertising in cases where advertising is wasteful per se. 相似文献
2.
3.
4.
5.
James E. Till 《Learned Publishing》2001,14(1):7-13
Although there was an early experiment in the 1960s with the central distribution of paper preprints in the biomedical sciences, these sciences have not been early adopters of electronic preprint servers. Some barriers to the development of a ‘preprint culture’ in the biomedical sciences are described. Multiple factors that, from the 1960s, fostered the transition from a paper-based preprint culture in high energy physics to an electronic one are also described. A new revolution in scientific publishing, in which journals come to be regarded as an overlay on electronic preprint databases, will probably overtake some areas of research much more quickly than others. 相似文献
6.
Online display advertising is a multi-billion dollar industry where advertisers promote their products to users by having publishers display their advertisements on popular Web pages. An important problem in online advertising is how to forecast the number of user visits for a Web page during a particular period of time. Prior research addressed the problem by using traditional time-series forecasting techniques on historical data of user visits; (e.g., via a single regression model built for forecasting based on historical data for all Web pages) and did not fully explore the fact that different types of Web pages and different time stamps have different patterns of user visits. In this paper, we propose a series of probabilistic latent class models to automatically learn the underlying user visit patterns among multiple Web pages and multiple time stamps. The last (and the most effective) proposed model identifies latent groups/classes of (i) Web pages and (ii) time stamps with similar user visit patterns, and learns a specialized forecast model for each latent Web page and time stamp class. Compared with a single regression model as well as several other baselines, the proposed latent class model approach has the capability of differentiating the importance of different types of information across different classes of Web pages and time stamps, and therefore has much better modeling flexibility. An extensive set of experiments along with detailed analysis carried out on real-world data from Yahoo! demonstrates the advantage of the proposed latent class models in forecasting online user visits in online display advertising. 相似文献
7.
[目的/意义]梳理国际预印本平台发展现状与态势,以有助于预印本平台未来建设,构建高质量学术交流体系。[方法/过程]采用网络调研和案例分析的方法,对国际上125个预印本平台的建设年份、所属地域、载文量与所涉学科、主要运营方属性和功能开发程度等6个方面的情况进行探究与分析。[结果/结论 ]经过30余年的发展与运行,预印本平台整体呈现出影响力逐渐显现、学术交流增值服务不断创新、利益相关者协作模式更加多元等态势。基于上述态势,对预印本平台未来发展提出展望,为预印本平台建设提供具有参考价值的路径。 相似文献
8.
预印本系统:国际学术交流的重要平台 总被引：9，自引：0，他引：9
本文从预印本的产生发展开始 ,介绍了国际上主要的应用站点的使用情况 ,并在此基础上总结了这种信息资源的重要作用 ,讨论了目前预印本界最关注的资源共享问题。笔者同时还介绍了“中国预印本服务系统”建设情况和功能特点。文章最后对预印本以及预印本系统的前景做了展望。 相似文献
9.
电子预印本档案——一种重要的网络信息资源 总被引：4，自引：1，他引：3
介绍电子预印本档案的使用方法,因特网上现有电子预印本档案的学科范围、规模与功能、创办人及信息组织方式。分析电子预印本档案的特点及其作为学术信息资源的利用价值。 相似文献
10.
广告作为一种经济信息与文化信息的传播活动,已成为中西方文化差异的外在表征。中西方文化价值观念的差异在广告传播中有充分的体现,本文从思维方式的差异、个人主义与集体主义的区别等方面综合观照了各种广告文本和广告活动中中西价值观念显在的差异。 相似文献
11.
预印本网站的风起云涌为传统的学术出版带来了前所未有的挑战.本文从分析预印本的特点出发,讨论其与学术期刊相比在促进学术交流和学术成果传播方面具有的优势及其未来发展存在的局限性,从而提出了学术期刊面对预印本带来的挑战应采取的措施,包括缩短同行评议周期、增加同行评议的透明度、实行开放获取和修订学术论文的评价体系等,以便更好地适应移动互联网时代的科学研究对学术出版的新需求. 相似文献
12.
《Journal of Radio & Audio Media》2013,20(1):175-190
Private, often unlicensed, radio stations played a major role in the democratization of Madagascar in the early 1990s and multiplied rapidly later in the decade. Despite Madagascar's gross domestic product of less than $7,000 per capita and small commercial economy, more than 20 stations, most of them small private operations, were on the air in the capital alone at the end of the decade. An explanatory model is advanced that takes into account low potential for profit through advertising, low cost of operation, and little or no regulatory intervention as factors in sustaining a large number of stations. 相似文献
13.
This article challenges the traditional illustration of the relations between circulation size and advertising rates used by educators. It does so by using a sample of newspapers and explores various regression trendlines and data display of the data obtained from the sample. I find that the relations are best explained by curvilinear rather than linear trendlines and suggest an improved illustration of the relations between advertising price and newspaper circulation. 相似文献
14.
15.
[目的 /意义]开放科学环境下,探究预印本平台的数据开放共享政策有助于保障科研利益相关者的数据质量,推动研究数据更加开放、共享、安全与透明。[方法 /过程]基于研究团队跟踪的125个预印本平台中共63份数据开放共享政策文本,利用网络调查与文本分析的方法进行内容挖掘与特点剖析。[结果 /结论 ]通过分析得出预印本平台的数据开放共享政策在数据创建、数据存储、数据发布、数据访问、数据重用5个阶段的主要特征,为更多预印本平台在未来制定完备的数据开放共享政策提供切入点与参考思路。 相似文献
16.
This study examines whether the naturalness of a device’s perceptual system, which defines the way users look around in the virtual environment, influences the persuasive effects of immersive virtual reality (IVR) advertising. In a between-subject experiment (N = 115), participants watched a 360-degree advertisement using one of three devices with different perceptual systems (a head-mounted display [HMD], a tablet, or a desktop computer, representing high, medium, and low naturalness respectively). The results revealed that participants who watched IVR advertising using a more naturally mapped perceptual interface (i.e., an HMD) reported higher levels of perceived naturalness than did those who used devices lower in naturalness (i.e., a tablet or a desktop computer). The use of a perceptual system with a higher level of natural mapping positively affected the sense of presence, which in turn enhanced advertising enjoyment and further improved the effects of IVR advertising, thereby yielding a three-step serial mediation model. 相似文献
17.
[目的/意义]为国内预印本发展提供理论与实践基础,推动国内预印本平台建设实践的发展。[方法/过程]通过文献调研及网络调研法,研究概述国内外有关预印本研究与相关实践的基本情况,从特征规律、认知发展、与期刊关系、质量控制机制、影响力评价、实践应用6个层面展开综述。[结果/结论]国内外预印本研究取得较为丰硕的成果,目前学者更加关注预印本与期刊论文之间的关系、预印本的质量控制机制及其影响力评价的问题,但也存在一些不足之处。未来可以开展有关预印本平台声明内容的规范、影响力评价的系统性探索以及普通预印本平台的发展现状分析等方面的研究。 相似文献
18.
通过对2010年《时尚COSMOPOLITAN》整页广告人物形象国别的统计分析,研究中外品牌在使用广告人物形象上的差异。 相似文献
19.
Research has found that humor in advertising can have effects on media evaluation. This experimental research discovers that positive effects suggested by excitation transfer and framing theories can apply specifically to radio advertising. It also extends previous research beyond the American context. Although gender sometimes leads to differences in humor appreciation, no important differences were identified in this research. Indirect links between humorous advertisements and potential audience ratings are uncovered, although direct links were not proven. 相似文献
20.
A global survey conducted by arXiv in 2016 showed that 58% of arXiv users thought arXiv should have a peer review system. The current opinion is that arXiv should adopt the Community Peer Review model. This paper evaluates and identifies two weak points of Community Peer Review and proposes a new peer review model – Self‐Organizing Peer Review. We propose a model in which automated methods of matching reviewers to articles and ranking both users and articles can be implemented. In addition, we suggest a strategic plan to increase recognition of articles in preprint databases within academic circles so that second generation preprint databases can achieve faster and cheaper publication. 相似文献