共查询到19条相似文献，搜索用时 46 毫秒
1.
2.
文献老化理论是图书情报学研究方法的经典理论之一。采用散文的风格论述了文献的起源、文献老化的表现形式、对文献老化文献检索的分析以及对文献老化的哲理思考。 相似文献
3.
国内人文社会科学文献老化规律对比研究——基于Web新形势下的研究 总被引：2，自引：1，他引：2
以CSSCI 2006—2008年间收录的所有专业期刊的共280,280篇来源文献的2,217,047条引文数据为样本,对比分析人文社会科学7大学科门类的老化规律;以引文分析共时法揭示了人文社会科学的整体老化现象。结果显示,历史学的老化并不严格遵循负指数函数;人文学科比社会学科文献老化慢很多;历史学和哲学对档案性文献的依赖性最强;人文社会科学各学科的普赖斯指数(P)*半衰期(H)=常数C,C在2.6左右波动;人文社会科学目前阶段的最大引文年限为3年。图3。表5。参考文献28。 相似文献
4.
文献老化是由于科学技术迅速发展,新文献大量涌现所带来的不可抗拒的客观规律。但是,文献老化的速度受着多种因素影响,其中有许多因素是人为因素,这就意味着存在人为影响和控制文献老化速度的多种可能性。本文拟就图书宣传工作对藏书老化的影响,以及如何利用这些影响,延缓藏书老化作一初步探讨。一、图书宣传对藏书老化的影响由文献老化半衰期的定义:“某学科领域现时尚在利用的全部文献中较新的一半是在多长一段时间内发表的可见文献老化的程度是根据其被利用的程度来衡量的。由半衰期的计算式: 相似文献
5.
综合性图书馆藏书老化分布规律研究 总被引：1，自引：0，他引：1
本文利用同步观测法对一个综合性高校图书馆的全部流通图书的种数，册数、流通次数进行统计，分析历年出版文献的利用率变化规律，证明中文图书文献也遵循一般期刊文献的老化规律，并提出了图书文献的衰老期和有效期分划概念。 相似文献
6.
文献老化刍议 总被引：2，自引：0，他引：2
张成梁 《浙江高校图书情报工作》1995,(2):27-29
本文联系实际综述了文献老化的概念，老化的原因、类型，以及文献老化的分析方法和量度指标，并对老化规律在实际工作中的应用作了简单论述。 相似文献
7.
Burton-Kebler�����ϻ���ȷ��������Ƚ���ķ� 总被引：11，自引：4，他引：7
借助灰色线性微分模型，建立了一种新的更直接的文献老化测度方法，并将其与Ｂｕｒｔｏｎ－Ｋｅｂｌｅｒ文献老化测度方法进行了比较，进一步证实了Ｂｕｒｔｏｎ－Ｋｅｂｌｅｒ文献老化测度方法的错误；还探索了文献老化真实规律的若干特征 相似文献
8.
目前,大多数图书馆采用"时限二分法"的期刊组织方式,但这种方法在装订时机的选择、期刊的实效性、查阅和复印的便利等方面具有一定的局限性.根据读者利用期刊文献的规律和期刊文献老化的规律提出的"时限三分法",能够合理、有效地解决期刊的排架、装订与利用问题,缓解图书馆期刊藏与用的矛盾. 相似文献
9.
论文献老化研究的预测性 总被引：1，自引：0，他引：1
用灰色一阶线性微分方程对历时测定的文献被引数据进行预测,从而测定文献老化历时半衰期的方法自１９９３年产生以来,人们已用其对我国和国外自然科学期刊文献的老化进行了测定,以期探索文献老化真实规律的各种特征,澄清文献老化研究中理论和方法的混乱,并为实际的文... 相似文献
10.
本文在文件生命周期理论、档案信息价值论和物质运动原理等传统理论的基础上,从逻辑和物理两个全新的视角对档案信息资源老化机理做出了细致阐述,明确地提出了档案信息资源老化的概念和机理,并将定性与定量分析方法相结合对档案信息资源老化测度指标进行了界定。 相似文献
11.
12.
《Library Acquisitions: Practice & Theory #》1994,18(1):67-70
This paper examines the advantages and disadvantages of conducting supplier evaluations, particularly manual evaluations. It considers sample size, the impact of variables, and what to do with the results. 相似文献
13.
14.
《Journal of Informetrics》2023,17(3):101426
Risk plays a fundamental role in scientific discoveries, and thus it is critical that the level of risk can be systematically quantified. We propose a novel approach to measuring risk entailed in a particular mode of discovery process – knowledge recombination. The recombination of extant knowledge serves as an important route to generate new knowledge, but attempts of recombination often fail. Drawing on machine learning and natural language processing techniques, our approach converts knowledge elements in the text format into high-dimensional vector expressions and computes the probability of failing to combine a pair of knowledge elements. Testing the calculated risk indicator on survey data, we confirm that our indicator is correlated with self-assessed risk. Further, as risk and novelty have been confounded in the literature, we examine and suggest the divergence of the bibliometric novelty and risk indicators. Finally, we demonstrate that our risk indicator is negatively associated with future citation impact, suggesting that risk-taking itself may not necessarily pay off. Our approach can assist decision making of scientists and relevant parties such as policymakers, funding bodies, and R&D managers. 相似文献
15.
Measuring Search Engine Quality 总被引：12，自引：3，他引：9
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures. 相似文献
16.
Respondent's opinions about survey research are regarded asan expression at the individual level of the general survey-takingclimate. Based on a review of the research about ‘surveyson surveys’ five relevant dimensions of the respondent'sopinion about surveys are distinguished: survey enjoyment, surveyvalue, survey cost, survey reliability, and survey privacy.Items related to these aspects are used to develop an ‘Opinionsabout Survey Scale’. The results of an analysis of thepredictive validity of the scale support the expectations basedon the theory of planned behavior. Opinions about surveys areassociated with the intention to participate in future surveysand with hesitation to fill out the questionnaire of a mailsurvey. Opinions are not related with participation in a follow-upmail survey. The results of the wave analysis of a mail surveyare a clear indication that nonrespondents have more negativeopinions about different aspects of surveys. This also meansthat the measurement of opinions is biased. However, becauseof this bias it is worthwhile and useful to measure these opinions. 相似文献
17.
18.
《Communication methods and measures》2013,7(2):79-115
Video games are a popular form of new media, and their use is impacting multiple fields of study within the communication discipline. For instance, research programs in mass communication, health, instructional, feminist/gender, interpersonal, and intercultural communication have all examined video games. Interactivity is the hallmark of video games and consequently is a common concept in the video game literature. While video game interactivity (VGI) is still an under-specified concept, previous research suggests that interactivity has the potential to moderate both positive and negative effects of video games, and therefore it is crucial for understanding general video game effects. We developed a theoretical model of video game interactivity and tested a multidimensional scale to assess video game interactivity across five studies using six independent samples. Exploratory and confirmatory factor analyses as well as item analyses revealed a reliable and valid metric consisting of six dimensions of video game interactivity. 相似文献
19.
Open access institutional repositories were created to promote access to information, encourage scholarly communication, and demonstrate institutional prestige. While these repositories have been widely adopted, the quality of their contents often fails to represent their institution's scholarly output. Moreover, current research uses measurements of quantity, not quality, to assess their value. In response, this article opens new areas of scholarly inquiry by assessing the quality of contents. This is accomplished through a cross-sectional study of repositories at American colleges and universities across the academic spectrum, using citation indexing to identify an institution's articles and authors of highest impact. 相似文献