This paper proposes linear and nonlinear filters for a non-Gaussian dynamic system with an unknown nominal covariance of the output noise.The challenge of designing a suitable filter in the presence of an unknown cova...This paper proposes linear and nonlinear filters for a non-Gaussian dynamic system with an unknown nominal covariance of the output noise.The challenge of designing a suitable filter in the presence of an unknown covariance matrix is addressed by focusing on the output data set of the system.Considering that data generated from a Gaussian distribution exhibit ellipsoidal scattering,we first propose the weighted sum of norms(SON)clustering method that prioritizes nearby points,reduces distant point influence,and lowers computational cost.Then,by introducing the weighted maximum likelihood,we propose a semi-definite program(SDP)to detect outliers and reduce their impacts on each cluster.Detecting these weights paves the way to obtain an appropriate covariance of the output noise.Next,two filtering approaches are presented:a cluster-based robust linear filter using the maximum a posterior(MAP)estimation and a clusterbased robust nonlinear filter assuming that output noise distribution stems from some Gaussian noise resources according to the ellipsoidal clusters.At last,simulation results demonstrate the effectiveness of our proposed filtering approaches.展开更多
目的:对我国无痛胃镜领域的高被引文献进行计量学分析。方法:以中国学术期刊全文数据库(CNKI)为数据源,检索2013年11月7日至2023年11月7日期间发表的无痛胃镜相关文献。依据普赖斯定律筛选高被引文献,并运用Excel 2021软件对文献的被引...目的:对我国无痛胃镜领域的高被引文献进行计量学分析。方法:以中国学术期刊全文数据库(CNKI)为数据源,检索2013年11月7日至2023年11月7日期间发表的无痛胃镜相关文献。依据普赖斯定律筛选高被引文献,并运用Excel 2021软件对文献的被引频次、发表年份、来源期刊、作者信息、机构分布、关键词及基金资助情况等计量学特征进行统计分析。结果:共筛选出251篇高被引文献,单篇被引频次介于9至118次之间,累计被引4264次,篇均被引16.99次。无痛胃镜高被引文献数量于2017年达到峰值,随后呈现下降趋势。251篇高被引文献分布于128种期刊中,其中《临床麻醉学杂志》《现代消化及介入诊疗》《中外医学研究》《山东医药》《实用临床医药杂志》《河北医药》《实用医学杂志》《中国临床研究》《中国内镜杂志》文献数依次位居前九位;涉及作者736人,累计合作186篇,总合作率74.10%;共涉及机构267个,其中河北省廊坊市第四人民医院、青岛市中心医院、上海交通大学、郑州大学文献居于前4位;共涉及关键词309个、1005次,其中“无痛胃镜”、“丙泊酚”出现次数居于前二;61篇文献获得73项次项目基金支持。Objective: To analyze the bibliometric characteristics of highly cited literature on painless gastroscopy in China. Methods: Literature on painless gastroscopy published between November 7, 2013, and November 7, 2023, was retrieved from the China National Knowledge Infrastructure (CNKI) database. Highly cited literature was identified based on Price’s Law, and statistical analysis of citations, publication year, journals, authors, institutions, keywords, and funding was conducted using Excel 2021. Results: A total of 251 highly cited articles were identified, with citation counts ranging from 9 to 118, totaling 4264 citations and an average of 16.99 citations per article. The number of highly cited articles on painless gastroscopy peaked in 2017 and subsequently declined. The 251 articles were published in 128 journals, with Journal of Clinical Anesthesiology, Modern Digestion & Intervention, Chinese and Foreign Medical Research, Shandong Medical Journal, Journal of Clinical Medicine in Practice, Hebei Medical Journal, Journal of Practical Medicine, Chinese Journal of Clinical Research, and Chinese Journal of Endoscopy ranking in the top nine in terms of the number of articles published. A total of 736 authors were involved, with 186 articles co-authored, resulting in a collaboration rate of 74.10%. The articles involved 267 institutions, with the Fourth People’s Hospital of Langfang in Hebei Province, Qingdao Central Hospital, Shanghai Jiao Tong University, and Zhengzhou University ranking in the top four. A total of 309 keywords appeared 1005 times, among them, the number of occurrences of “painless gastroscopy” and “propofol” ranked in the top two;Sixty-one articles received support from 73 funding projects.展开更多
目的:通过文献计量学方法分析CNKI中骨关节炎高被引文献的特征,把握研究核心议题和发展趋势。方法:利用中国学术期刊全文数据库(CNKI),以“骨关节炎”为篇名或主题词进行精确检索。采用普赖斯定律确定高被引文献,对存在交叉重复或一稿...目的:通过文献计量学方法分析CNKI中骨关节炎高被引文献的特征,把握研究核心议题和发展趋势。方法:利用中国学术期刊全文数据库(CNKI),以“骨关节炎”为篇名或主题词进行精确检索。采用普赖斯定律确定高被引文献,对存在交叉重复或一稿多投的文献,仅保留引用次数最高的,并将其他文献的引用次数合并到此文献中。对发表年份、关键词、期刊名称、作者所在机构等信息进行数据整理和统计分析。结果:CNKI收录骨关节炎相关文献36,119篇,其中被引用的文献约8957篇,占24.8%,累计被引107,484次,平均每篇约12次;高被引文献967篇,占总文献的2.68%,在被引用文献中占比10.79%。排除4篇重复文献后,纳入963篇进行统计分析,累积被引104,987次,占总被引的97.65%,平均每篇被引108.7次。高被引文献首次出现在1957年,1957~1978年增长停滞,1980~2022年数量显著上升。前五名期刊为《中国骨质疏松杂志》《中国组织工程研究》《中国中西医结合杂志》《中国康复医学杂志》和《中国中药杂志》。涉及268个机构,其中医院类占61.38%,院校类占29.31%,科研机构占7.59%,企业公司占1.72%。每篇文献平均包含2至8个关键词,共涉及864个独特关键词,总共使用2006次,平均每篇3.85个关键词。结论:本文对骨关节炎高被引文献的特征进行了系统分析,有助于掌握骨关节炎研究现状,为探索骨关节炎领域研究的核心议题和发展趋势提供了一定的参考和指引。Objective: To analyze the characteristics of highly cited osteoarthritis literature in CNKI using bibliometrics, and to understand the core research issues and development trends. Methods: CNKI was searched for articles with “osteoarthritis” in the title or as a subject term. Highly cited literature was defined using Price’s Law. For cross-duplicated or multi-submitted articles, only the one with the highest citation count was retained. Data on publication years, keywords, journal names, and authors’ institutions were organized and statistically analyzed. Results: CNKI contains 36,119 articles on osteoarthritis from 1957 to 2024. Of these, approximately 8957 articles (24.8%) have been cited, with a total of 107,484 citations, averaging about 12 per article. There are 967 highly cited articles, accounting for 2.68% of the total and 10.79% of the cited articles. After excluding 4 duplicates, 963 articles were analyzed, with a total of 104,987 citations (97.65% of the total), averaging 108.7 per article. The first highly cited article appeared in 1957, with almost no growth from 1957 to 1978. From 1980 to 2022, the number increased significantly. The top five journals are “Chinese Journal of Osteoporosis”, “Chinese Journal of Tissue Engineering Research”, “Chinese Journal of Integrated Traditional and Western Medicine”, “Chinese Journal of Rehabilitation Medicine”, and “Chinese Journal of Chinese Materia Medica”. The 963 articles involve 268 institutions, with hospitals accounting for 61.38%, universities for 29.31%, research institutes for 7.59%, and enterprises for 1.72%. On average, each article contains 2 to 8 keywords, involving 864 unique keywords used 2006 times, averaging 3.85 per article. Conclusion: This study systematically analyzes the characteristics of highly cited osteoarthritis literature, providing a reference for understanding the current research status, core issues, and development trends in the field of osteoarthritis.展开更多
目的:本研究旨在探讨我国甲状腺功能亢进症领域高被引文献的计量学特征。方法:通过运用筛选中国学术期刊全文数据库(CNKI)中于1960年至2024年收录的甲状腺功能亢进症相关文献,再运用普莱斯定律筛选出有关内容的高被引文献,通过运用Excel...目的:本研究旨在探讨我国甲状腺功能亢进症领域高被引文献的计量学特征。方法:通过运用筛选中国学术期刊全文数据库(CNKI)中于1960年至2024年收录的甲状腺功能亢进症相关文献,再运用普莱斯定律筛选出有关内容的高被引文献,通过运用Excel 2007对被引次数、发表时间、发布来源、原创人员信息、机构单位等进行数据统计分析。结果:此次分析共筛选出141篇高被引文献,单篇被引频次介于25至105次之间,总计被引6512次,每篇平均被引46.18次。文献统计量逐渐上升并于2016年达到峰值16篇后逐年递减,直至于2021年降至2篇,年均发表量为3.5篇。这些文献分别位于104种期刊中,其中《中国实用外科杂志》与《中华内分泌代谢杂志》在文献数量方面均位列前四。研究共涉及455位作者,署名次数总计487次,其中倪青、邹大进、黄江荣的署名次数位居前三。参与研究的机构共计211个,包括156家医院(占比73.93%)、47所院校(占比22.27%)、5个研究所(占比2.37%)及3家企业研究机构(占比1.42%)。发文量排名前五的机构分别为第二军医大学长海医院内分泌科、第四军医大学西京医院核医学科、中国中医科学院广安门医院内分泌科、山东省潍坊市中医院内科及辽宁中医药大学。研究共涉及239个关键词,总计出现474次,五个关键词的使用频率最高,分别为:“甲状腺功能亢进症”、“甲状腺功能亢进”、“甲巯咪唑”、“中医药治疗”、“丙硫氧嘧啶”。此外,42篇文献获得基金支持,共计50项次。结论:CNKI数据库中甲状腺功能亢进症高被引文献显示出以《中国实用外科杂志》和《中华内分泌代谢杂志》为权威发表平台,以医院为主要研究机构,以甲状腺功能亢进症为核心研究主题的特征,并形成了以倪青、邹大进、黄江荣等为代表的核心研究团队。然而,研究中关键词的使用规范性有待提高,且基金资助力度相对不足。Objective: To analyze the bibliometric characteristics of highly cited literature on hyperthyroidism in China. Methods: Literature concerning hyperthyroidism was extensively searched and retrieved from the China National Knowledge Infrastructure (CNKI) database, spanning from 1960 to the year 2024. Highly cited literature was determined based on Price’s Law, and Excel 2007 was used to statistically analyze citations, publication years, journals, authors, institutions, keywords, and funds. Results: This meticulous analysis pinpointed a compendium of 141 widely-cited articles, with citation counts individually spanning from 25 to 105 instances, accumulating to a grand total of 6512 citations and reflecting an average citation rate of 46.18 citations per scholarly piece. The number of articles peaked at 16 in 2016 and then declined annually, dropping to 2 by 2021, with an average annual publication rate of 3.5 articles. These articles were distributed across 104 journals, among which the “Chinese Journal of Practical Surgery” and the “Chinese Journal of Endocrinology and Metabolism” ranked in the top four in terms of the number of articles published. The study involved 455 authors, with a total of 487 authorship credits, among which Ni Qing, Zou Dajin, and Huang Jiangrong had the highest number of authorship credits. A total of 211 institutions participated in the research, including 156 hospitals (73.93%), 47 universities and colleges (22.27%), 5 research institutes (2.37%), and 3 corporate research institutions (1.42%). The top five institutions in terms of publication volume were the Department of Endocrinology at Changhai Hospital of the Second Military Medical University, the Department of Nuclear Medicine at Xijing Hospital of the Fourth Military Medical University, the Department of Endocrinology at Guang’anmen Hospital of the China Academy of Chinese Medical Sciences, the Department of Internal Medicine at Weifang Traditional Chinese Medicine Hospital in Shandong Province, and Liaoning University of Traditional Chinese Medicine. The study involved 239 keywords, appearing a total of 474 times, with “hyperthyroidism”, “thyrotoxicosis”, “methimazole”, “traditional Chinese medicine treatment”, and “propylthiouracil” being the most frequently used. Additionally, 42 articles received funding support, totaling 50 grants. Conclusion: The highly cited articles on hyperthyroidism in the CNKI database demonstrate that the “Chinese Journal of Practical Surgery” and the “Chinese Journal of Endocrinology and Metabolism” serve as authoritative publication platforms, with hospitals being the primary research institutions and hyperthyroidism as the core research theme. A core research team represented by Ni Qing, Zou Dajin, and Huang Jiangrong has emerged. However, the standardization of keyword usage needs improvement, and the level of funding support remains relatively insufficient.展开更多
文摘This paper proposes linear and nonlinear filters for a non-Gaussian dynamic system with an unknown nominal covariance of the output noise.The challenge of designing a suitable filter in the presence of an unknown covariance matrix is addressed by focusing on the output data set of the system.Considering that data generated from a Gaussian distribution exhibit ellipsoidal scattering,we first propose the weighted sum of norms(SON)clustering method that prioritizes nearby points,reduces distant point influence,and lowers computational cost.Then,by introducing the weighted maximum likelihood,we propose a semi-definite program(SDP)to detect outliers and reduce their impacts on each cluster.Detecting these weights paves the way to obtain an appropriate covariance of the output noise.Next,two filtering approaches are presented:a cluster-based robust linear filter using the maximum a posterior(MAP)estimation and a clusterbased robust nonlinear filter assuming that output noise distribution stems from some Gaussian noise resources according to the ellipsoidal clusters.At last,simulation results demonstrate the effectiveness of our proposed filtering approaches.
文摘目的:对我国无痛胃镜领域的高被引文献进行计量学分析。方法:以中国学术期刊全文数据库(CNKI)为数据源,检索2013年11月7日至2023年11月7日期间发表的无痛胃镜相关文献。依据普赖斯定律筛选高被引文献,并运用Excel 2021软件对文献的被引频次、发表年份、来源期刊、作者信息、机构分布、关键词及基金资助情况等计量学特征进行统计分析。结果:共筛选出251篇高被引文献,单篇被引频次介于9至118次之间,累计被引4264次,篇均被引16.99次。无痛胃镜高被引文献数量于2017年达到峰值,随后呈现下降趋势。251篇高被引文献分布于128种期刊中,其中《临床麻醉学杂志》《现代消化及介入诊疗》《中外医学研究》《山东医药》《实用临床医药杂志》《河北医药》《实用医学杂志》《中国临床研究》《中国内镜杂志》文献数依次位居前九位;涉及作者736人,累计合作186篇,总合作率74.10%;共涉及机构267个,其中河北省廊坊市第四人民医院、青岛市中心医院、上海交通大学、郑州大学文献居于前4位;共涉及关键词309个、1005次,其中“无痛胃镜”、“丙泊酚”出现次数居于前二;61篇文献获得73项次项目基金支持。Objective: To analyze the bibliometric characteristics of highly cited literature on painless gastroscopy in China. Methods: Literature on painless gastroscopy published between November 7, 2013, and November 7, 2023, was retrieved from the China National Knowledge Infrastructure (CNKI) database. Highly cited literature was identified based on Price’s Law, and statistical analysis of citations, publication year, journals, authors, institutions, keywords, and funding was conducted using Excel 2021. Results: A total of 251 highly cited articles were identified, with citation counts ranging from 9 to 118, totaling 4264 citations and an average of 16.99 citations per article. The number of highly cited articles on painless gastroscopy peaked in 2017 and subsequently declined. The 251 articles were published in 128 journals, with Journal of Clinical Anesthesiology, Modern Digestion & Intervention, Chinese and Foreign Medical Research, Shandong Medical Journal, Journal of Clinical Medicine in Practice, Hebei Medical Journal, Journal of Practical Medicine, Chinese Journal of Clinical Research, and Chinese Journal of Endoscopy ranking in the top nine in terms of the number of articles published. A total of 736 authors were involved, with 186 articles co-authored, resulting in a collaboration rate of 74.10%. The articles involved 267 institutions, with the Fourth People’s Hospital of Langfang in Hebei Province, Qingdao Central Hospital, Shanghai Jiao Tong University, and Zhengzhou University ranking in the top four. A total of 309 keywords appeared 1005 times, among them, the number of occurrences of “painless gastroscopy” and “propofol” ranked in the top two;Sixty-one articles received support from 73 funding projects.
文摘目的:通过文献计量学方法分析CNKI中骨关节炎高被引文献的特征,把握研究核心议题和发展趋势。方法:利用中国学术期刊全文数据库(CNKI),以“骨关节炎”为篇名或主题词进行精确检索。采用普赖斯定律确定高被引文献,对存在交叉重复或一稿多投的文献,仅保留引用次数最高的,并将其他文献的引用次数合并到此文献中。对发表年份、关键词、期刊名称、作者所在机构等信息进行数据整理和统计分析。结果:CNKI收录骨关节炎相关文献36,119篇,其中被引用的文献约8957篇,占24.8%,累计被引107,484次,平均每篇约12次;高被引文献967篇,占总文献的2.68%,在被引用文献中占比10.79%。排除4篇重复文献后,纳入963篇进行统计分析,累积被引104,987次,占总被引的97.65%,平均每篇被引108.7次。高被引文献首次出现在1957年,1957~1978年增长停滞,1980~2022年数量显著上升。前五名期刊为《中国骨质疏松杂志》《中国组织工程研究》《中国中西医结合杂志》《中国康复医学杂志》和《中国中药杂志》。涉及268个机构,其中医院类占61.38%,院校类占29.31%,科研机构占7.59%,企业公司占1.72%。每篇文献平均包含2至8个关键词,共涉及864个独特关键词,总共使用2006次,平均每篇3.85个关键词。结论:本文对骨关节炎高被引文献的特征进行了系统分析,有助于掌握骨关节炎研究现状,为探索骨关节炎领域研究的核心议题和发展趋势提供了一定的参考和指引。Objective: To analyze the characteristics of highly cited osteoarthritis literature in CNKI using bibliometrics, and to understand the core research issues and development trends. Methods: CNKI was searched for articles with “osteoarthritis” in the title or as a subject term. Highly cited literature was defined using Price’s Law. For cross-duplicated or multi-submitted articles, only the one with the highest citation count was retained. Data on publication years, keywords, journal names, and authors’ institutions were organized and statistically analyzed. Results: CNKI contains 36,119 articles on osteoarthritis from 1957 to 2024. Of these, approximately 8957 articles (24.8%) have been cited, with a total of 107,484 citations, averaging about 12 per article. There are 967 highly cited articles, accounting for 2.68% of the total and 10.79% of the cited articles. After excluding 4 duplicates, 963 articles were analyzed, with a total of 104,987 citations (97.65% of the total), averaging 108.7 per article. The first highly cited article appeared in 1957, with almost no growth from 1957 to 1978. From 1980 to 2022, the number increased significantly. The top five journals are “Chinese Journal of Osteoporosis”, “Chinese Journal of Tissue Engineering Research”, “Chinese Journal of Integrated Traditional and Western Medicine”, “Chinese Journal of Rehabilitation Medicine”, and “Chinese Journal of Chinese Materia Medica”. The 963 articles involve 268 institutions, with hospitals accounting for 61.38%, universities for 29.31%, research institutes for 7.59%, and enterprises for 1.72%. On average, each article contains 2 to 8 keywords, involving 864 unique keywords used 2006 times, averaging 3.85 per article. Conclusion: This study systematically analyzes the characteristics of highly cited osteoarthritis literature, providing a reference for understanding the current research status, core issues, and development trends in the field of osteoarthritis.
文摘目的:本研究旨在探讨我国甲状腺功能亢进症领域高被引文献的计量学特征。方法:通过运用筛选中国学术期刊全文数据库(CNKI)中于1960年至2024年收录的甲状腺功能亢进症相关文献,再运用普莱斯定律筛选出有关内容的高被引文献,通过运用Excel 2007对被引次数、发表时间、发布来源、原创人员信息、机构单位等进行数据统计分析。结果:此次分析共筛选出141篇高被引文献,单篇被引频次介于25至105次之间,总计被引6512次,每篇平均被引46.18次。文献统计量逐渐上升并于2016年达到峰值16篇后逐年递减,直至于2021年降至2篇,年均发表量为3.5篇。这些文献分别位于104种期刊中,其中《中国实用外科杂志》与《中华内分泌代谢杂志》在文献数量方面均位列前四。研究共涉及455位作者,署名次数总计487次,其中倪青、邹大进、黄江荣的署名次数位居前三。参与研究的机构共计211个,包括156家医院(占比73.93%)、47所院校(占比22.27%)、5个研究所(占比2.37%)及3家企业研究机构(占比1.42%)。发文量排名前五的机构分别为第二军医大学长海医院内分泌科、第四军医大学西京医院核医学科、中国中医科学院广安门医院内分泌科、山东省潍坊市中医院内科及辽宁中医药大学。研究共涉及239个关键词,总计出现474次,五个关键词的使用频率最高,分别为:“甲状腺功能亢进症”、“甲状腺功能亢进”、“甲巯咪唑”、“中医药治疗”、“丙硫氧嘧啶”。此外,42篇文献获得基金支持,共计50项次。结论:CNKI数据库中甲状腺功能亢进症高被引文献显示出以《中国实用外科杂志》和《中华内分泌代谢杂志》为权威发表平台,以医院为主要研究机构,以甲状腺功能亢进症为核心研究主题的特征,并形成了以倪青、邹大进、黄江荣等为代表的核心研究团队。然而,研究中关键词的使用规范性有待提高,且基金资助力度相对不足。Objective: To analyze the bibliometric characteristics of highly cited literature on hyperthyroidism in China. Methods: Literature concerning hyperthyroidism was extensively searched and retrieved from the China National Knowledge Infrastructure (CNKI) database, spanning from 1960 to the year 2024. Highly cited literature was determined based on Price’s Law, and Excel 2007 was used to statistically analyze citations, publication years, journals, authors, institutions, keywords, and funds. Results: This meticulous analysis pinpointed a compendium of 141 widely-cited articles, with citation counts individually spanning from 25 to 105 instances, accumulating to a grand total of 6512 citations and reflecting an average citation rate of 46.18 citations per scholarly piece. The number of articles peaked at 16 in 2016 and then declined annually, dropping to 2 by 2021, with an average annual publication rate of 3.5 articles. These articles were distributed across 104 journals, among which the “Chinese Journal of Practical Surgery” and the “Chinese Journal of Endocrinology and Metabolism” ranked in the top four in terms of the number of articles published. The study involved 455 authors, with a total of 487 authorship credits, among which Ni Qing, Zou Dajin, and Huang Jiangrong had the highest number of authorship credits. A total of 211 institutions participated in the research, including 156 hospitals (73.93%), 47 universities and colleges (22.27%), 5 research institutes (2.37%), and 3 corporate research institutions (1.42%). The top five institutions in terms of publication volume were the Department of Endocrinology at Changhai Hospital of the Second Military Medical University, the Department of Nuclear Medicine at Xijing Hospital of the Fourth Military Medical University, the Department of Endocrinology at Guang’anmen Hospital of the China Academy of Chinese Medical Sciences, the Department of Internal Medicine at Weifang Traditional Chinese Medicine Hospital in Shandong Province, and Liaoning University of Traditional Chinese Medicine. The study involved 239 keywords, appearing a total of 474 times, with “hyperthyroidism”, “thyrotoxicosis”, “methimazole”, “traditional Chinese medicine treatment”, and “propylthiouracil” being the most frequently used. Additionally, 42 articles received funding support, totaling 50 grants. Conclusion: The highly cited articles on hyperthyroidism in the CNKI database demonstrate that the “Chinese Journal of Practical Surgery” and the “Chinese Journal of Endocrinology and Metabolism” serve as authoritative publication platforms, with hospitals being the primary research institutions and hyperthyroidism as the core research theme. A core research team represented by Ni Qing, Zou Dajin, and Huang Jiangrong has emerged. However, the standardization of keyword usage needs improvement, and the level of funding support remains relatively insufficient.
