以ISI的Web of Science为数据源,借助文献计量学方法,从文献的学科分布、国家/地区分布、作者分布和基金资助分布等方面,对国外2008年-2011年间有关数字图书馆研究的相关论文进行统计与分析。同时采用关键词共现和文献共被引分析方法,借...以ISI的Web of Science为数据源,借助文献计量学方法,从文献的学科分布、国家/地区分布、作者分布和基金资助分布等方面,对国外2008年-2011年间有关数字图书馆研究的相关论文进行统计与分析。同时采用关键词共现和文献共被引分析方法,借助CiteSpaceⅡ对文献的关键词和参考文献进行可视化分析,发现国外数字图书馆研究以借助相关计算机技术提供用户个性化、易用性服务为核心研究内容,并将成为持续研究热点,具体研究热点包括:基于本体、语义web的数字图书馆信息检索、数字图书馆系统设计、数字图书馆可用性评价、数字图书馆模型、数字图书馆个性化协同服务等。展开更多
Neural stem cells,which are capable of multi-potential differentiation and self-renewal,have recently been shown to have clinical potential for repairing central nervous system tissue damage.However,the theme trends a...Neural stem cells,which are capable of multi-potential differentiation and self-renewal,have recently been shown to have clinical potential for repairing central nervous system tissue damage.However,the theme trends and knowledge structures for human neural stem cells have not yet been studied bibliometrically.In this study,we retrieved 2742 articles from the PubMed database from 2013 to 2018 using "Neural Stem Cells" as the retrieval word.Co-word analysis was conducted to statistically quantify the characteristics and popular themes of human neural stem cell-related studies.Bibliographic data matrices were generated with the Bibliographic Item Co-Occurrence Matrix Builder.We identified 78 high-frequency Medical Subject Heading(MeSH)terms.A visual matrix was built with the repeated bisection method in gCLUTO software.A social network analysis network was generated with Ucinet 6.0 software and GraphPad Prism 5 software.The analyses demonstrated that in the 6-year period,hot topics were clustered into five categories.As suggested by the constructed strategic diagram,studies related to cytology and physiology were well-developed,whereas those related to neural stem cell applications,tissue engineering,metabolism and cell signaling,and neural stem cell pathology and virology remained immature.Neural stem cell therapy for stroke and Parkinson’s disease,the genetics of microRNAs and brain neoplasms,as well as neuroprotective agents,Zika virus,Notch receptor,neural crest and embryonic stem cells were identified as emerging hot spots.These undeveloped themes and popular topics are potential points of focus for new studies on human neural stem cells.展开更多
The construction method for chains of disasters or events is still one of the core scientific questions in studying the common rules of disaster’s evolution.Especially when dealing with the complexity and diversity o...The construction method for chains of disasters or events is still one of the core scientific questions in studying the common rules of disaster’s evolution.Especially when dealing with the complexity and diversity of disasters,it is critical to make a further investigation on reducing the dependency of prior knowledge and supporting the comprehensive chains of disasters.This paper tries to propose a novel approach,through collecting the big scholar and social news data with disasterrelated keywords,analysing the strength of their relationships with the co-word analysis method,and constructing a complex network of all defined disaster types,in order to finally intelligently extract the unique disaster chain of a specific disaster type.Google Scholar,Baidu Scholar and Sina News search engines are employed to acquire the needed data,and the respectively obtained disaster chains are compared with each other to show the robustness of our proposed approach.The achieved disaster chains are also compared with the ones concluded from existing research methods,and the very reasonable result is demonstrated.There is a great potential to apply this novel method in disaster management domain to find more secrets about disasters.展开更多
Using the advantages of web crawlers in data collection and distributed storage technologies,we accessed to a wealth of forestry-related data.Combined with the mature big data technology at its present stage,Hadoop...Using the advantages of web crawlers in data collection and distributed storage technologies,we accessed to a wealth of forestry-related data.Combined with the mature big data technology at its present stage,Hadoop's distributed system was selected to solve the storage problem of massive forestry big data and the memory-based Spark computing framework to realize real-time and fast processing of data.The forestry data contains a wealth of information,and mining this information is of great significance for guiding the development of forestry.We conducts co-word and cluster analyses on the keywords of forestry data,extracts the rules hidden in the data,analyzes the research hotspots more accurately,grasps the evolution trend of subject topics,and plays an important role in promoting the research and development of subject areas.The co-word analysis and clustering algorithm have important practical significance for the topic structure,research hotspot or development trend in the field of forestry research.Distributed storage framework and parallel computing have greatly improved the performance of data mining algorithms.Therefore,the forestry big data mining system by big data technology has important practical significance for promoting the development of intelligent forestry.展开更多
目的 分析Web of science数据库中2009-2019年心血管病相关护理研究的热点,了解该领域研究现状及发展趋势.方法 以主题词"cardiovascular disease"检索Web of science数据库,提取研究文献中的高频关键词.结果 提取研究文献中...目的 分析Web of science数据库中2009-2019年心血管病相关护理研究的热点,了解该领域研究现状及发展趋势.方法 以主题词"cardiovascular disease"检索Web of science数据库,提取研究文献中的高频关键词.结果 提取研究文献中的高频关键词32个,占总频次累计百分比为26.22%.共词聚类分析后得出以下6个研究热点:护士与护理实践、代谢相关心血管健康问题、心血管病患者健康管理、心力衰竭患者的教育与康复、心血管风险防控与健康促进、血压的管理及其影响因素.结论 近10年心血管病护理研究集中探索了护理实践在心血管病健康促进、风险与疾病管理中的重要意义,为拓展心血管病领域的护理实践、护理科研提供了理论基础.展开更多
本文以Web of Science数据库为数据来源,利用文献计量学方法,从文献资源的著者、学科以及国家和地区分布等方面进行统计分析,探讨语义网环境下基于本体的知识集成研究进展。同时利用CiteSpace3.7.R8可视化软件对文献的引文和关键词进行...本文以Web of Science数据库为数据来源,利用文献计量学方法,从文献资源的著者、学科以及国家和地区分布等方面进行统计分析,探讨语义网环境下基于本体的知识集成研究进展。同时利用CiteSpace3.7.R8可视化软件对文献的引文和关键词进行可视化分析,发现热点和经典文献,为进一步的研究提供借鉴。展开更多
Keywords word frequency and co-word analysis are adopted in an attempt to to investigate the focuses and fronts of inter-national second language acquisition(SLA) researches by analyzing the key words in articles publ...Keywords word frequency and co-word analysis are adopted in an attempt to to investigate the focuses and fronts of inter-national second language acquisition(SLA) researches by analyzing the key words in articles published in the internationally re-nowned SLA academic journal Language Learning from 2012 to 2016. It is found that the best researched topics in SLA are vocabu-lary acquisition, explicit knowledge, form-focused teaching, language use, and so on, among which learner's language attracts themost attention. In terms of research methods, they become more diversified and interdisciplinary, as empirical studies take a domi-nant position and experiments still play a leading role, displaying an interdisciplinary feature.展开更多
文摘以ISI的Web of Science为数据源,借助文献计量学方法,从文献的学科分布、国家/地区分布、作者分布和基金资助分布等方面,对国外2008年-2011年间有关数字图书馆研究的相关论文进行统计与分析。同时采用关键词共现和文献共被引分析方法,借助CiteSpaceⅡ对文献的关键词和参考文献进行可视化分析,发现国外数字图书馆研究以借助相关计算机技术提供用户个性化、易用性服务为核心研究内容,并将成为持续研究热点,具体研究热点包括:基于本体、语义web的数字图书馆信息检索、数字图书馆系统设计、数字图书馆可用性评价、数字图书馆模型、数字图书馆个性化协同服务等。
基金supported by the National Natural Science Foundation of China,No.81471308(to JL)the Stem Cell Clinical Research Project in China,No.CMR-20161129-1003(to JL)the Innovation Technology Funding of Dalian in China,No.2018J11CY025(to JL)
文摘Neural stem cells,which are capable of multi-potential differentiation and self-renewal,have recently been shown to have clinical potential for repairing central nervous system tissue damage.However,the theme trends and knowledge structures for human neural stem cells have not yet been studied bibliometrically.In this study,we retrieved 2742 articles from the PubMed database from 2013 to 2018 using "Neural Stem Cells" as the retrieval word.Co-word analysis was conducted to statistically quantify the characteristics and popular themes of human neural stem cell-related studies.Bibliographic data matrices were generated with the Bibliographic Item Co-Occurrence Matrix Builder.We identified 78 high-frequency Medical Subject Heading(MeSH)terms.A visual matrix was built with the repeated bisection method in gCLUTO software.A social network analysis network was generated with Ucinet 6.0 software and GraphPad Prism 5 software.The analyses demonstrated that in the 6-year period,hot topics were clustered into five categories.As suggested by the constructed strategic diagram,studies related to cytology and physiology were well-developed,whereas those related to neural stem cell applications,tissue engineering,metabolism and cell signaling,and neural stem cell pathology and virology remained immature.Neural stem cell therapy for stroke and Parkinson’s disease,the genetics of microRNAs and brain neoplasms,as well as neuroprotective agents,Zika virus,Notch receptor,neural crest and embryonic stem cells were identified as emerging hot spots.These undeveloped themes and popular topics are potential points of focus for new studies on human neural stem cells.
基金funded by National Key Research and Development Program of China(Grant No.2016YFC0803107,Grant No.2016YFB0502601)Shenzhen Science and Technology Innovation Commission(JCYJ20170307152553273).
文摘The construction method for chains of disasters or events is still one of the core scientific questions in studying the common rules of disaster’s evolution.Especially when dealing with the complexity and diversity of disasters,it is critical to make a further investigation on reducing the dependency of prior knowledge and supporting the comprehensive chains of disasters.This paper tries to propose a novel approach,through collecting the big scholar and social news data with disasterrelated keywords,analysing the strength of their relationships with the co-word analysis method,and constructing a complex network of all defined disaster types,in order to finally intelligently extract the unique disaster chain of a specific disaster type.Google Scholar,Baidu Scholar and Sina News search engines are employed to acquire the needed data,and the respectively obtained disaster chains are compared with each other to show the robustness of our proposed approach.The achieved disaster chains are also compared with the ones concluded from existing research methods,and the very reasonable result is demonstrated.There is a great potential to apply this novel method in disaster management domain to find more secrets about disasters.
基金grants from the Fundamental Research Funds for the Central Universities(Grant No.2572018BH02)Special Funds for Scientific Research in the Forestry Public Welfare Industry(Grant Nos.201504307-03)。
文摘Using the advantages of web crawlers in data collection and distributed storage technologies,we accessed to a wealth of forestry-related data.Combined with the mature big data technology at its present stage,Hadoop's distributed system was selected to solve the storage problem of massive forestry big data and the memory-based Spark computing framework to realize real-time and fast processing of data.The forestry data contains a wealth of information,and mining this information is of great significance for guiding the development of forestry.We conducts co-word and cluster analyses on the keywords of forestry data,extracts the rules hidden in the data,analyzes the research hotspots more accurately,grasps the evolution trend of subject topics,and plays an important role in promoting the research and development of subject areas.The co-word analysis and clustering algorithm have important practical significance for the topic structure,research hotspot or development trend in the field of forestry research.Distributed storage framework and parallel computing have greatly improved the performance of data mining algorithms.Therefore,the forestry big data mining system by big data technology has important practical significance for promoting the development of intelligent forestry.
文摘目的 分析Web of science数据库中2009-2019年心血管病相关护理研究的热点,了解该领域研究现状及发展趋势.方法 以主题词"cardiovascular disease"检索Web of science数据库,提取研究文献中的高频关键词.结果 提取研究文献中的高频关键词32个,占总频次累计百分比为26.22%.共词聚类分析后得出以下6个研究热点:护士与护理实践、代谢相关心血管健康问题、心血管病患者健康管理、心力衰竭患者的教育与康复、心血管风险防控与健康促进、血压的管理及其影响因素.结论 近10年心血管病护理研究集中探索了护理实践在心血管病健康促进、风险与疾病管理中的重要意义,为拓展心血管病领域的护理实践、护理科研提供了理论基础.
文摘本文以Web of Science数据库为数据来源,利用文献计量学方法,从文献资源的著者、学科以及国家和地区分布等方面进行统计分析,探讨语义网环境下基于本体的知识集成研究进展。同时利用CiteSpace3.7.R8可视化软件对文献的引文和关键词进行可视化分析,发现热点和经典文献,为进一步的研究提供借鉴。
文摘Keywords word frequency and co-word analysis are adopted in an attempt to to investigate the focuses and fronts of inter-national second language acquisition(SLA) researches by analyzing the key words in articles published in the internationally re-nowned SLA academic journal Language Learning from 2012 to 2016. It is found that the best researched topics in SLA are vocabu-lary acquisition, explicit knowledge, form-focused teaching, language use, and so on, among which learner's language attracts themost attention. In terms of research methods, they become more diversified and interdisciplinary, as empirical studies take a domi-nant position and experiments still play a leading role, displaying an interdisciplinary feature.
