We analyze muscular dystrophy recorded by sEMG and use standard methodologies and nonlinear chaotic methods here including the RQA. We reach sufficient evidence that the sEMG signal contains a large chaotic component....We analyze muscular dystrophy recorded by sEMG and use standard methodologies and nonlinear chaotic methods here including the RQA. We reach sufficient evidence that the sEMG signal contains a large chaotic component. We have estimated the correlation dimension (fractal measure), the largest Lyapunov exponent, the LZ complexity and the %Rec and %Det of the RQA demonstrating that such indexes are able to detect the presence of repetitive hidden patterns in sEMG which, in turn, senses the level of MU synchronization within the muscle. The results give also an interesting methodological indication in the sense that it evidences the manner in which nonlinear methods and RQA must be arranged and applied in clinical routine in order to obtain results of clinical interest. We have studied the muscular dystrophy and evidence that the continuous regime of chaotic transitions that we have in muscular mechanisms may benefit in this pathology by the use of the NPT treatment that we have considered in detail in our previous publications.展开更多
Apoptosis proteins play an important role in the development and homeostasis of an organism. The elucidation of the subcellular locations and functions of these proteins is helpful for understanding the mechanism of p...Apoptosis proteins play an important role in the development and homeostasis of an organism. The elucidation of the subcellular locations and functions of these proteins is helpful for understanding the mechanism of programmed cell death. In this paper, the recurrent quantification analysis, Hilbert-Huang transform methods, the maximum relevance and minimum redundancy method and support vector machine are used to predict the subcellular location of apoptosis proteins. The validation of the jackknife test suggests that the proposed method can improve the prediction accuracy of the subcellular location of apoptosis proteins and its application may be promising in other fields.展开更多
The use of Recurrence plots have been extensively used in various fields. In this work, Recurrence Plots (RPs) investigates the changes in the non-linear behaviour of urban air pollution using large datasets of raw da...The use of Recurrence plots have been extensively used in various fields. In this work, Recurrence Plots (RPs) investigates the changes in the non-linear behaviour of urban air pollution using large datasets of raw data (hourly). This analysis has not been used before to extract information from large datasets for this type non-linear problem. Two different approaches have been used to tackle this problem. The first approach is to show results according to monitoring network. The second approach is to show the results by particle type. This analysis shows the feasibility of using Recurrence Analysis for pollution monitoring and control.展开更多
Gas-solid fluidized beds are widely considered as nonlinear and chaotic dynamic systems. Pressure fluc- tuations were measured in a fluidized bed of 0.15 m in diameter and were analyzed using multiple approaches: dis...Gas-solid fluidized beds are widely considered as nonlinear and chaotic dynamic systems. Pressure fluc- tuations were measured in a fluidized bed of 0.15 m in diameter and were analyzed using multiple approaches: discrete Fourier transform (DFT), discrete wavelet transform (DWT), and nonlinear recur- rence quantification analysis (RQA). Three different methods proposed that the complex dynamics of a fluidized bed system can be presented as macro, meso and micro structures. It was found from DFT and DWT that a minimum in wide band energy with an increase in the velocity corresponds to the transition between macro structures and finer structures of the fluidization system. Corresponding transition veloc- ity occurs at gas velocities of 0.3, 0.5 and 0.6 m]s for sands with mean diameters of 150, 280 and 490/~m, respectively. DFT, DWT, and RQA could determine frequency range of0-3.125 Hz for macro, 3. ! 25-50 Hz for meso, and 50-200 Hz for micro structures. The RQA showed that the micro structures have the least periodicity and consequently their determinism and laminarity are the lowest. The results show that a combination of DFT, DWT, and RQA can be used as an effective approach to characterize multi-scale flow behavior in gas-solid fluidized beds.展开更多
OBJECTIVE:To show that the pulse diagnosis used in Traditional Chinese Medicine,combined with nonlinear dynamic analysis,can help identify cardiovascular diseases.METHODS:Recurrence quantification analysis(RQA) was us...OBJECTIVE:To show that the pulse diagnosis used in Traditional Chinese Medicine,combined with nonlinear dynamic analysis,can help identify cardiovascular diseases.METHODS:Recurrence quantification analysis(RQA) was used to study pulse morphological changes in 37 inpatients with coronary heart disease(CHD) and 37 normal subjects(controls).An independent sample t-test detected significant differences in RQA measures of their pulses.A support vector machine(SVM) classified the groups according to their RQA measures.Classic time-domain parameters were used for comparison.RESULTS:RQA measures can be divided into two groups.One group of measures [ecurrence rate(RR),determinism(DEL),average diagonal line length(L),maximum length of diagonal structures(Lmax),Shannon entropy of the frequency distribution of diagonal line lengths(ENTR),laminarity(LAM),average length of vertical structures(TT),maximum length of vertical structures(Vmax)] showed significantly higher values for patients with CHD than for normal subjects(P<0.05).The other measures(RR_std,L_std,Lmax_std,TT_std,Vmax_std) showed significantly lower values for the CHD group than for normal subjects(P<0.05).SVM classification accuracy was higher with RQA measures:With RQA(16 parameters) accuracy was at 88.21%,and with RQA(12 parameters) accuracy was at 84.11%.In contrast,with classic time-domain(15 parameters) accuracy was 75.73%,and with time-domain(7 parameters) accuracy was 74.70%.CONCLUSION:Nonlinear dynamic methods such as RQA can be used to study functional and structural changes in the pulse noninvasively.Pulse signals of individuals with CHD have greater regularity,determinism,and stability than normal subjects,and their pulse morphology displays less variability.RQA can distinguish the CHD pulse from the healthy pulse with an accuracy of 88.21%,thereby providing an early diagnosis of cardiovascular diseases such as CHD.展开更多
多变量预测模型模式识别(variable predictive model based class discriminate,简称VPMCD)利用样本特征值内在的相关性来建立特征学习模型,但是当训练样本较少时会导致模型预测不准确,因此提出了基于递归定量分析(recurrence quantific...多变量预测模型模式识别(variable predictive model based class discriminate,简称VPMCD)利用样本特征值内在的相关性来建立特征学习模型,但是当训练样本较少时会导致模型预测不准确,因此提出了基于递归定量分析(recurrence quantification analysis,简称RQA)和投票法多变量预测模型模式识别(voted variable predictive model based class discriminate,简称V-VPMCD)的故障识别方法。该方法利用了递归定量分析对非线性、非平稳信号分析的鲁棒性和样本质量不高时处理的优势,以VPMCD作为分类方法,并用投票法优化了VPMCD方法,提升了算法的稳定性和识别率。对滚动轴承不同程度、不同类型故障的模式识别实验表明,该优化算法具有较高的识别准确率和稳定性。展开更多
文摘We analyze muscular dystrophy recorded by sEMG and use standard methodologies and nonlinear chaotic methods here including the RQA. We reach sufficient evidence that the sEMG signal contains a large chaotic component. We have estimated the correlation dimension (fractal measure), the largest Lyapunov exponent, the LZ complexity and the %Rec and %Det of the RQA demonstrating that such indexes are able to detect the presence of repetitive hidden patterns in sEMG which, in turn, senses the level of MU synchronization within the muscle. The results give also an interesting methodological indication in the sense that it evidences the manner in which nonlinear methods and RQA must be arranged and applied in clinical routine in order to obtain results of clinical interest. We have studied the muscular dystrophy and evidence that the continuous regime of chaotic transitions that we have in muscular mechanisms may benefit in this pathology by the use of the NPT treatment that we have considered in detail in our previous publications.
基金supported by the National Natural Science Foundation of China (Grant No. 11071282)the Chinese Program for New Century Excellent Talents in University (Grant No. NCET-08-06867)+4 种基金the Natural Science Foundation of Hunan Province of China(Grant No. 10JJ7001)the Lotus Scholars Program of Hunan Province of Chinathe Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province of Chinathe Australian Research Council (GrantNo. DP0559807)the Postgraduate Research and Innovation Project of Hunan Province of China (Grant No. CX2010B243)
文摘Apoptosis proteins play an important role in the development and homeostasis of an organism. The elucidation of the subcellular locations and functions of these proteins is helpful for understanding the mechanism of programmed cell death. In this paper, the recurrent quantification analysis, Hilbert-Huang transform methods, the maximum relevance and minimum redundancy method and support vector machine are used to predict the subcellular location of apoptosis proteins. The validation of the jackknife test suggests that the proposed method can improve the prediction accuracy of the subcellular location of apoptosis proteins and its application may be promising in other fields.
文摘The use of Recurrence plots have been extensively used in various fields. In this work, Recurrence Plots (RPs) investigates the changes in the non-linear behaviour of urban air pollution using large datasets of raw data (hourly). This analysis has not been used before to extract information from large datasets for this type non-linear problem. Two different approaches have been used to tackle this problem. The first approach is to show results according to monitoring network. The second approach is to show the results by particle type. This analysis shows the feasibility of using Recurrence Analysis for pollution monitoring and control.
文摘Gas-solid fluidized beds are widely considered as nonlinear and chaotic dynamic systems. Pressure fluc- tuations were measured in a fluidized bed of 0.15 m in diameter and were analyzed using multiple approaches: discrete Fourier transform (DFT), discrete wavelet transform (DWT), and nonlinear recur- rence quantification analysis (RQA). Three different methods proposed that the complex dynamics of a fluidized bed system can be presented as macro, meso and micro structures. It was found from DFT and DWT that a minimum in wide band energy with an increase in the velocity corresponds to the transition between macro structures and finer structures of the fluidization system. Corresponding transition veloc- ity occurs at gas velocities of 0.3, 0.5 and 0.6 m]s for sands with mean diameters of 150, 280 and 490/~m, respectively. DFT, DWT, and RQA could determine frequency range of0-3.125 Hz for macro, 3. ! 25-50 Hz for meso, and 50-200 Hz for micro structures. The RQA showed that the micro structures have the least periodicity and consequently their determinism and laminarity are the lowest. The results show that a combination of DFT, DWT, and RQA can be used as an effective approach to characterize multi-scale flow behavior in gas-solid fluidized beds.
基金Supported by Innovation Program of Shanghai Municipal Education Commission(No.11YZ71)the 3rd Shanghai Leading Academic Discipline Project(No.S30302)the National Natural Science Foundation of China(No. 81173199)
文摘OBJECTIVE:To show that the pulse diagnosis used in Traditional Chinese Medicine,combined with nonlinear dynamic analysis,can help identify cardiovascular diseases.METHODS:Recurrence quantification analysis(RQA) was used to study pulse morphological changes in 37 inpatients with coronary heart disease(CHD) and 37 normal subjects(controls).An independent sample t-test detected significant differences in RQA measures of their pulses.A support vector machine(SVM) classified the groups according to their RQA measures.Classic time-domain parameters were used for comparison.RESULTS:RQA measures can be divided into two groups.One group of measures [ecurrence rate(RR),determinism(DEL),average diagonal line length(L),maximum length of diagonal structures(Lmax),Shannon entropy of the frequency distribution of diagonal line lengths(ENTR),laminarity(LAM),average length of vertical structures(TT),maximum length of vertical structures(Vmax)] showed significantly higher values for patients with CHD than for normal subjects(P<0.05).The other measures(RR_std,L_std,Lmax_std,TT_std,Vmax_std) showed significantly lower values for the CHD group than for normal subjects(P<0.05).SVM classification accuracy was higher with RQA measures:With RQA(16 parameters) accuracy was at 88.21%,and with RQA(12 parameters) accuracy was at 84.11%.In contrast,with classic time-domain(15 parameters) accuracy was 75.73%,and with time-domain(7 parameters) accuracy was 74.70%.CONCLUSION:Nonlinear dynamic methods such as RQA can be used to study functional and structural changes in the pulse noninvasively.Pulse signals of individuals with CHD have greater regularity,determinism,and stability than normal subjects,and their pulse morphology displays less variability.RQA can distinguish the CHD pulse from the healthy pulse with an accuracy of 88.21%,thereby providing an early diagnosis of cardiovascular diseases such as CHD.
文摘多变量预测模型模式识别(variable predictive model based class discriminate,简称VPMCD)利用样本特征值内在的相关性来建立特征学习模型,但是当训练样本较少时会导致模型预测不准确,因此提出了基于递归定量分析(recurrence quantification analysis,简称RQA)和投票法多变量预测模型模式识别(voted variable predictive model based class discriminate,简称V-VPMCD)的故障识别方法。该方法利用了递归定量分析对非线性、非平稳信号分析的鲁棒性和样本质量不高时处理的优势,以VPMCD作为分类方法,并用投票法优化了VPMCD方法,提升了算法的稳定性和识别率。对滚动轴承不同程度、不同类型故障的模式识别实验表明,该优化算法具有较高的识别准确率和稳定性。