Four pitfalls in normalizing citation indicators: An investigation of ESI’s selection of highly cited papers     

Zhigang Hu  Wencan Tian  Shenmeng Xu  Chunbo Zhang  Xianwen Wang 《Journal of Informetrics》2018,12(4):1133-1145

InCites Essential Science Indicators is becoming increasingly used to identify top-performing research and evaluate the impact of institutes. Unfortunately, our study shows that ESI indicators, as well as other normalized citation indicators, have the following flaws. First, the publication month and the online-to-print delay affect a paper’s probability of becoming a Highly Cited Paper (HCP). Papers published in the earlier months of the year are more likely to accumulate enough citation counts to rank at the top 1% compared with those published in later months of the year. Papers with longer online-to-print delays have an apparent advantage for being selected as HCPs. Research field normalizations lead to the third pitfall. Different research fields have different citation thresholds for HCPs, making research field classification important for a journal. In addition, the uniform thresholds for both articles and reviews in ESI affect the reliability of HCP selection because, on average, reviews tend to have higher citation rates than articles. ESI’s selection of HCPs provides an intuitive feel for the problems of normalized citation impact indicators, such as those provided in InCites and SciVal.  相似文献   

数字调制类型的识别及实现     

宋全有  李万高 《商丘职业技术学院学报》2006,5(2):59-61

通信信号的调制识别是目前研究的热点问题.本文给出一种新的数字调制信号识别方法.高速数字专用芯片ADSP2101是此方法具体实现的重要器件,这一方法在实际通信中有着广泛的应用.  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   

Writer identification approach based on bag of words with OBI features     

Amal Durou  Ibrahim Aref  Somaya Al-Maadeed  Ahmed Bouridane  Elhadj Benkhelifa 《Information processing & management》2019,56(2):354-366

Handwriter identification aims to simplify the task of forensic experts by providing them with semi-automated tools in order to enable them to narrow down the search to determine the final identification of an unknown handwritten sample. An identification algorithm aims to produce a list of predicted writers of the unknown handwritten sample ranked in terms of confidence measure metrics for use by the forensic expert will make the final decision.Most existing handwriter identification systems use either statistical or model-based approaches. To further improve the performances this paper proposes to deploy a combination of both approaches using Oriented Basic Image features and the concept of graphemes codebook. To reduce the resulting high dimensionality of the feature vector a Kernel Principal Component Analysis has been used. To gauge the effectiveness of the proposed method a performance analysis, using IAM dataset for English handwriting and ICFHR 2012 dataset for Arabic handwriting, has been carried out. The results obtained achieved an accuracy of 96% thus demonstrating its superiority when compared against similar techniques.  相似文献   

An NCME Instructional Module on Data Mining Methods for Classification and Regression     

Sandip Sinharay 《Educational Measurement》2016,35(3):38-54

Data mining methods for classification and regression are becoming increasingly popular in various scientific fields. However, these methods have not been explored much in educational measurement. This module first provides a review, which should be accessible to a wide audience in education measurement, of some of these methods. The module then demonstrates using three real‐data examples that these methods may lead to an improvement over traditionally used methods such as linear and logistic regression in educational measurement.  相似文献   

应收账款管理创新研究   总被引：1，自引：0，他引：1  

张尧洪 《宁波职业技术学院学报》2004,8(6):29-31

在传统应收账款管理方法的基础上，企业应运用维．帕累托(Vilfredo．Pareto)最优分析法对应收账款进行分类管理。即把已有客户分为核心客户、主要客户和一般客户，对他们实行不同的信用管理。对新客户运用稳健分析模型进行信用分析，然后做出销售决策。对销售人员确立应收账款管理目标，以应收账款质量提高作为目标管理的主要内容，企业销售人员的考核与应收账款质量的提高挂钩，建立应收账款管理的激励和约束机制。  相似文献   

小说《简爱》中梦境的审美分析     

龙丽伟  魏现江 《铜仁学院学报》2007,1(4):26-29

梦是文学创作的一种特殊的表达方式。在小说《简爱》中,夏洛蒂.勃朗特通过梦的意象把女主人公简爱充满疑虑和矛盾的内心展现在读者面前。该文对小说中的梦境描写进行了归类并对其作了进一步分析,展示通过梦意象的运用产生了震撼人心的艺术效果,增强了思想感情表达的艺术张力。  相似文献   

后牙折裂原因与分类初探     

张李明  卢东民 《湖州师范学院学报》2004,26(2):95-97

收集典型病例，观察年龄、牙位、牙髓状况、充填洞型、咬合等与牙折裂的关系，按斜折、纵折、横折、粉碎折四型对牙折进行分类，研究发现：后牙折裂年龄集中在30～60岁，上下颌第一磨牙折裂率最高．折裂与牙髓状况、充填、咬合有关，各型牙折以Ⅰ类B型和Ⅱ类B型牙折率较高．死髓牙、严重磨耗牙、Ⅱ类洞充填的牙要特别注意防止其发生牙折，不同类型的牙折治疗原则应有针对性。  相似文献   

语义分类的学科主题演化分析方法研究——以我国图书情报领域大数据研究为例     

刘自强  王效岳  白如江 《图书情报工作》2016,60(15):76

[目的/意义] 学科主题演化研究有助于掌握学科发展现状、研究热点、研究前沿和发展趋势等情况,是进行科技创新的基础,是面向科技创新的重要研究方向。[方法/过程] 提出一种语义分类的学科主题演化分析方法：将关键词分为研究问题、研究方法和研究技术3类,构建不同语义分类的共词网络;然后基于Fast Unfolding社区发现算法识别具有语义特征的社区（主题）;利用相似度算法计算相邻子时期主题间的相似度,构建学科主题演化图谱,以分析某学科领域研究问题、研究方法和研究技术的变化,实现深度、细致的学科主题演化分析。[结果/结论] 通过对2012-2015年CNKI数据库收录的我国大数据研究领域相关论文数据的处理分析,证明该方法的准确性和有效性。  相似文献   

An Interview with Arlene G. Taylor     

Arlene G. Taylor 《Cataloging & classification quarterly》2016,54(8):521-536

In this interview, conducted via email during August 2016, Dr. Arlene G. Taylor discusses her career as a cataloger, professor of cataloging and classification, and her work in professional associations. Topics include her early cataloging and teaching experiences, changes in both cataloging practice and the teaching of cataloging, subject analysis, and “aboutness” as compared with form/genre access, professional experiences outside the United States, and the future of MLIS programs.  相似文献