音频文献数字化过程中应注意的几个问题   总被引：2，自引：0，他引：2  

曾刚 《晋图学刊》2005,(2):24-25,71

本文总结了我馆做VOD点播系统时音频文献数字化过程中的几点经验,涉及到采样率、降噪、标签的编辑等内容。  相似文献   

Hierarchical clustering of a Finnish newspaper article collection with graded relevance assessments     

Tuomo Korenius  Jorma Laurikkala  Martti Juhola  Kalervo Järvelin 《Information Retrieval》2006,9(1):33-53

Search facilitated with agglomerative hierarchical clustering methods was studied in a collection of Finnish newspaper articles (N = 53,893). To allow quick experiments, clustering was applied to a sample (N = 5,000) that was reduced with principal components analysis. The dendrograms were heuristically cut to find an optimal partition, whose clusters were compared with each of the 30 queries to retrieve the best-matching cluster. The four-level relevance assessment was collapsed into a binary one by (A) considering all the relevant and (B) only the highly relevant documents relevant, respectively. Single linkage (SL) was the worst method. It created many tiny clusters, and, consequently, searches enabled with it had high precision and low recall. The complete linkage (CL), average linkage (AL), and Ward's methods (WM) returned reasonably-sized clusters typically of 18–32 documents. Their recall (A: 27–52%, B: 50–82%) and precision (A: 83–90%, B: 18–21%) was higher than and comparable to those of the SL clusters, respectively. The AL and WM clustering had 1–8% better effectiveness than nearest neighbor searching (NN), and SL and CL were 1–9% less efficient that NN. However, the differences were statistically insignificant. When evaluated with the liberal assessment A, the results suggest that the AL and WM clustering offer better retrieval ability than NN. Assessment B renders the AL and WM clustering better than NN, when recall is considered more important than precision. The results imply that collections in the highly inflectional and agglutinative languages, such as Finnish, may be clustered as the collections in English, provided that documents are appropriately preprocessed.  相似文献   

情报检索系统用户相关性判断的灰色聚类决策   总被引：2，自引：0，他引：2  

王筠 《中国图书馆学报》2004,30(1)

所谓灰色聚类决策,就是按多个不同的决策指标对决策对象进行综合评价,以确定决策对象是否满足给定的取舍原则。该方法可以用于对情报检索系统的检索结果进行相关性判断。参考文献4。  相似文献   

高校馆配中文电子书的现状与问题分析     

顾烨青  陈铭 《高校图书馆工作》2018,(1):42-52

当前,高校馆配中文电子书的市场供给由直接渠道中的内容出版商和间接渠道中的数字图书馆集成商、传统纸质书馆配商构成。高校馆配中文电子书市场存在着平台众多、整合困难,电子书格式、功能与呈现方式不一,标准的行业认可度和执行力不足,新书纸电同步率不高,定价偏低等诸多问题。高校图书馆界应增进与供给渠道商的沟通合作,发挥CALIS的桥梁纽带作用,加强电子书的阅读推广,培养师生成熟的版权意识,深入调研读者阅读行为,制订符合馆情的纸质书与电子书协同采访方针。  相似文献   

我国期刊集群的研究进展与发展态势——基于共词分析方法     

高虹  吴玲  许宇鹏 《编辑学报》2018,30(5):463-467

期刊集群是国际期刊业的重要发展趋势,也是提升我国期刊整体水平的正确方向,理解和把握期刊集群的研究热点和发展态势是做好期刊集群理论创新和实践应用的关键问题。基于共词分析法,研究我国期刊集群领域学术论文的整体概况、高频  相似文献   

辽宁西部地区先秦时期聚落遗址空间格局分析     

公雪霜  于丽君  聂跃平  朱建峰  潘玉青 《中国科学院大学学报》2016,33(3):373-379

聚落考古是以聚落遗址为研究对象的考古学重要手段之一.选取遗址数目众多的辽宁西部地区,采用决策树分类和基于遗址等级权重的改进聚类分析方法划分聚落,研究聚落分布及其内部结构关系.经分析,辽宁西部地区聚落分布受到水系、地貌和气候的共同作用,不同时期呈现出不同形态.区域中最大的聚落位于大凌河支流流域,该位置与史料中记载的辽西区域郡首阳乐的位置十分相近.通过对遗址等级的统计分析,各聚落内高等级遗址所占比例逐渐减小,最后趋于5%左右,各聚落高等级遗址的控制范围与位置和聚落内部遗址数目关系密切.  相似文献   

Coordinating multiple representations of polynomials: What do patterns in students' solution strategies reveal?     

《Learning and Instruction》2017

We investigate the strategies used by 64 advanced secondary mathematics students to identify whether a given pair of polynomial representations (graphs, tables, or equations) corresponded to the same function on an assessment of coordinating representations. Participants also completed assessments of domain-related knowledge and background skills. Cluster analysis of strategies by representation pair revealed patterns in the participants' strategy use. Two clusters were identifiable on tasks that required matching equations to graphs and graphs to tables. We identified overlap between these two clusters, suggesting that while the representation pair influenced strategy choice, there was also a general distinction between students who used more and less sophisticated strategies. However, students who used more sophisticated coordination strategies were similar to the others on measures of domain-specific knowledge or background skills. We consider implications for future investigations testing interventions to promote coordinating representations.  相似文献   

城市化水平的聚类和因子分析   总被引：1，自引：0，他引：1  

陶毅 《南通职业大学学报》2005,19(4):99-101

运用聚类分析模型和因子分析方法，对长三角地区16个城市在10个经济指标变量上的样本数据进行了分析，从量和质的角度综合评价了各城市的城市化的水平。  相似文献   

探索高校科技期刊出版模式的改革措施     

刘志强 《编辑学报》2016,28(3):213-216

在介绍了当前国际上科技期刊主流出版模式以及跨国化、集团化、规模化的发展趋势的基础上,对我国高校科技期刊的出版模式进行了探索和研究,分析其体制机制、运营方式及各模式优缺点,并对高校科技期刊的发展定位以及集约化改革措施提出了一些建议,为促进我国高校科技期刊整合资源、做大做强提供参考.  相似文献   

大学出版社学术期刊集群化运营模式研究——以清华大学出版社期刊中心为例     

刘俊  张昕  颜帅 《编辑学报》2016,28(6):561-564

针对出版单位的学术期刊集群模式发展特点,根据清华大学出版社的期刊集群化建设实践,总结出学术期刊集群建设具有的普遍优势,包括办刊资源共享、人员共用、集中管理、统一制度建设、统一宣传发布平台建设等,分析大学出版社开展学术期刊集群化建设的特殊优势,包括兼具学科优势和管理优势、书刊互动、“产学研”一体化等.提出了清华大学出版社学术期刊集群的未来发展建议.  相似文献