目的:基于CiteSpace软件,对富血小板血浆在国内外骨科领域中的运用进行图谱绘制、数据分析,总结并预测其在该领域的研究进展和发展趋势。方法:以中国知网、维普、万方、PubMed及Web of Science数据库为数据来源,筛选建库至2022年11月1...目的:基于CiteSpace软件,对富血小板血浆在国内外骨科领域中的运用进行图谱绘制、数据分析,总结并预测其在该领域的研究进展和发展趋势。方法:以中国知网、维普、万方、PubMed及Web of Science数据库为数据来源,筛选建库至2022年11月1日的富血小板血浆在骨科领域的相关文献,应用CiteSpace软件进行可视化分析,从年发文量、作者、关键词等方面进行讨论。结果:筛选得到国内三大数据库中富血小板血浆与骨科相关文献(核心期刊)共1089篇,PubMed数据库及Web of Science核心合集分别得到2568、1645篇。结果表明,国内外富血小板血浆在骨科领域的相关文献发文量逐年增加,研究中心主要集中在骨关节炎、骨组织工程、肌腱病、骨缺损等方面。结论:富血小板血浆未来的进一步应用,应侧重于向其“治疗疾病的生物分子学机制探讨”“注射规范与标准的建立”“骨关节炎临床疗效的精进”“与骨组织工程学的结合”等方向发展。展开更多
For Multi-Carrier-Code Division Multiple Access (MC-CDMA) systems,it is usually as- sumed that the fading of the subcarriers is frequency non-selective and independent of each other. This paper shows that the two assu...For Multi-Carrier-Code Division Multiple Access (MC-CDMA) systems,it is usually as- sumed that the fading of the subcarriers is frequency non-selective and independent of each other. This paper shows that the two assumptions are incompatible.In fact,the MC-CDMA signals at each subcarrier undergo fading that are highly correlated.Based on this observation,this paper develops a simulation algorithm for Rayleigh fading channels via frequency-domain correlation function,which incorporates the Doppler effect simultaneously.Numerical examples are presented to demonstrate the effectiveness of the new algorithm,with the conclusion that the independence assumption of subcar- rier fading overrates the system performance.展开更多
目的探讨中医体质类型与阿尔茨海默病(Alzheimer’s disease,AD)的关系,并构建AD风险预警模型。方法在已建立的中国农村延缓失智和失能的多模干预研究(multimodal interventions to delay dementia and disability in rural China,MIND-...目的探讨中医体质类型与阿尔茨海默病(Alzheimer’s disease,AD)的关系,并构建AD风险预警模型。方法在已建立的中国农村延缓失智和失能的多模干预研究(multimodal interventions to delay dementia and disability in rural China,MIND-China)中,纳入4033例≥60岁老年被试者。采集人口学、既往病史和神经心理学评估资料,并采用老年人中医药服务记录表评估被试中医体质。应用2011年美国国立老化研究院和阿尔茨海默病协会发布的NIA-AA诊断标准进行临床很可能AD诊断。利用R统计软件进行Logistic回归分析并构建AD风险预测模型,采用列线图对最终预测结果进行展示。结果MIND-China队列中老年人群以偏颇体质为主(69.28%),其中痰湿质最多(58.05%),其次是阳虚质(23.85%)。AD患者中最常见的中医体质是痰湿质(54.35%),其次是气郁质(38.04%)。多因素Logistic回归分析提示,年龄(β=0.101,P<0.001,OR=1.107,95%CI:1.069~1.146)和气郁质(β=0.622,P=0.016,OR=1.862,95%CI:1.116~3.076)能够增加AD的发病风险,而教育(β=-1.047,P<0.001,OR=0.351,95%CI:0.205~0.584)能够减少AD的发病风险。通过使用风险评分模型计算各研究对象所得风险总分并绘制受试者工作曲线(receiver operating characteristic curve,ROC),曲线下面积为0.769,校准曲线表现出良好的预测与实际的一致性。结论中医体质为气郁质的老年人,罹患AD的风险明显增加。展开更多
The contrast function remains to be an open problem in blind source separation （BSS） when the number of source signals is unknown and/or dynamically changed. The paper studies this problem and proves that the mutual...The contrast function remains to be an open problem in blind source separation （BSS） when the number of source signals is unknown and/or dynamically changed. The paper studies this problem and proves that the mutual information is still the contrast function for BSS if the mixing matrix is of full column rank. The mutual information reaches its minimum at the separation points, where the random outputs of the BSS system are the scaled and permuted source signals, while the others are zero outputs. Using the property that the transpose of the mixing matrix and a matrix composed by m observed signals have the indentical null space with probability one, a practical method, which can detect the unknown number of source signals n, ulteriorly traces the dynamical change of the sources number with a few of data, is proposed. The effectiveness of the proposed theorey and the developed novel algorithm is verified by adaptive BSS simulations with unknown and dynamically changing number of source signals.展开更多
文摘目的:基于CiteSpace软件,对富血小板血浆在国内外骨科领域中的运用进行图谱绘制、数据分析,总结并预测其在该领域的研究进展和发展趋势。方法:以中国知网、维普、万方、PubMed及Web of Science数据库为数据来源,筛选建库至2022年11月1日的富血小板血浆在骨科领域的相关文献,应用CiteSpace软件进行可视化分析,从年发文量、作者、关键词等方面进行讨论。结果:筛选得到国内三大数据库中富血小板血浆与骨科相关文献(核心期刊)共1089篇,PubMed数据库及Web of Science核心合集分别得到2568、1645篇。结果表明,国内外富血小板血浆在骨科领域的相关文献发文量逐年增加,研究中心主要集中在骨关节炎、骨组织工程、肌腱病、骨缺损等方面。结论:富血小板血浆未来的进一步应用,应侧重于向其“治疗疾病的生物分子学机制探讨”“注射规范与标准的建立”“骨关节炎临床疗效的精进”“与骨组织工程学的结合”等方向发展。
基金Supported by the Major Program of the National Natural Science Foundation of China (No.60496311).
文摘For Multi-Carrier-Code Division Multiple Access (MC-CDMA) systems,it is usually as- sumed that the fading of the subcarriers is frequency non-selective and independent of each other. This paper shows that the two assumptions are incompatible.In fact,the MC-CDMA signals at each subcarrier undergo fading that are highly correlated.Based on this observation,this paper develops a simulation algorithm for Rayleigh fading channels via frequency-domain correlation function,which incorporates the Doppler effect simultaneously.Numerical examples are presented to demonstrate the effectiveness of the new algorithm,with the conclusion that the independence assumption of subcar- rier fading overrates the system performance.
文摘目的探讨中医体质类型与阿尔茨海默病(Alzheimer’s disease,AD)的关系,并构建AD风险预警模型。方法在已建立的中国农村延缓失智和失能的多模干预研究(multimodal interventions to delay dementia and disability in rural China,MIND-China)中,纳入4033例≥60岁老年被试者。采集人口学、既往病史和神经心理学评估资料,并采用老年人中医药服务记录表评估被试中医体质。应用2011年美国国立老化研究院和阿尔茨海默病协会发布的NIA-AA诊断标准进行临床很可能AD诊断。利用R统计软件进行Logistic回归分析并构建AD风险预测模型,采用列线图对最终预测结果进行展示。结果MIND-China队列中老年人群以偏颇体质为主(69.28%),其中痰湿质最多(58.05%),其次是阳虚质(23.85%)。AD患者中最常见的中医体质是痰湿质(54.35%),其次是气郁质(38.04%)。多因素Logistic回归分析提示,年龄(β=0.101,P<0.001,OR=1.107,95%CI:1.069~1.146)和气郁质(β=0.622,P=0.016,OR=1.862,95%CI:1.116~3.076)能够增加AD的发病风险,而教育(β=-1.047,P<0.001,OR=0.351,95%CI:0.205~0.584)能够减少AD的发病风险。通过使用风险评分模型计算各研究对象所得风险总分并绘制受试者工作曲线(receiver operating characteristic curve,ROC),曲线下面积为0.769,校准曲线表现出良好的预测与实际的一致性。结论中医体质为气郁质的老年人,罹患AD的风险明显增加。
基金supported by the National Natural Science Foundation of China(Grant No.60496311).
文摘The contrast function remains to be an open problem in blind source separation （BSS） when the number of source signals is unknown and/or dynamically changed. The paper studies this problem and proves that the mutual information is still the contrast function for BSS if the mixing matrix is of full column rank. The mutual information reaches its minimum at the separation points, where the random outputs of the BSS system are the scaled and permuted source signals, while the others are zero outputs. Using the property that the transpose of the mixing matrix and a matrix composed by m observed signals have the indentical null space with probability one, a practical method, which can detect the unknown number of source signals n, ulteriorly traces the dynamical change of the sources number with a few of data, is proposed. The effectiveness of the proposed theorey and the developed novel algorithm is verified by adaptive BSS simulations with unknown and dynamically changing number of source signals.
