A novel approach for constructing robust Mamdani fuzzy system was proposed, which consisted of an efficiency robust estimator(partial robust M-regression, PRM) in the parameter learning phase of the initial fuzzy syst...A novel approach for constructing robust Mamdani fuzzy system was proposed, which consisted of an efficiency robust estimator(partial robust M-regression, PRM) in the parameter learning phase of the initial fuzzy system, and an improved subtractive clustering algorithm in the fuzzy-rule-selecting phase. The weights obtained in PRM, which gives protection against noise and outliers, were incorporated into the potential measure of the subtractive cluster algorithm to enhance the robustness of the fuzzy rule cluster process, and a compact Mamdani-type fuzzy system was established after the parameters in the consequent parts of rules were re-estimated by partial least squares(PLS). The main characteristics of the new approach were its simplicity and ability to construct fuzzy system fast and robustly. Simulation and experiment results show that the proposed approach can achieve satisfactory results in various kinds of data domains with noise and outliers. Compared with D-SVD and ARRBFN, the proposed approach yields much fewer rules and less RMSE values.展开更多
The atomic force microscope(AFM)can measure nanoscale morphology and mechanical properties and has a wide range of applications.The traditional method for measuring the mechanical properties of a sample does so for th...The atomic force microscope(AFM)can measure nanoscale morphology and mechanical properties and has a wide range of applications.The traditional method for measuring the mechanical properties of a sample does so for the longitudinal and transverse properties separately,ignoring the coupling between them.In this paper,a data processing and multidimensional mechanical information extraction algorithm for the composite mode of peak force tapping and torsional resonance is proposed.On the basis of a tip–sample interaction model for the AFM,longitudinal peak force data are used to decouple amplitude and phase data of transverse torsional resonance,accurately identify the tip–sample longitudinal contact force in each peak force cycle,and synchronously obtain the corresponding characteristic images of the transverse amplitude and phase.Experimental results show that the measured longitudinal mechanical characteristics are consistent with the transverse amplitude and phase characteristics,which verifies the effectiveness of the method.Thus,a new method is provided for the measurement of multidimensional mechanical characteristics using the AFM.展开更多
针对矢量水听器阵列信号波达方向(Direction of Arrival,DOA)估计中存在的估计精度不高、运算量大的问题,提出了一种改进蛇鹫优化算法的最大似然DOA估计方法。采用了4种策略对蛇鹫优化算法进行改进,在种群初始化时利用佳点集策略进行改...针对矢量水听器阵列信号波达方向(Direction of Arrival,DOA)估计中存在的估计精度不高、运算量大的问题,提出了一种改进蛇鹫优化算法的最大似然DOA估计方法。采用了4种策略对蛇鹫优化算法进行改进,在种群初始化时利用佳点集策略进行改进,能够更加均匀地在搜索空间得到初始种群解,提高种群多样性;在进行位置更新时,引入减法平均优化器和柯西策略能够扩大搜索范围,从而跳出局部最优;引入黄金正弦策略,不断向最优位置进行搜索,提高了算法的估计精度。将所提算法应用于最大似然DOA估计,实验结果表明:与灰狼优化算法、粒子群算法、正弦余弦算法、光学显微镜算法、蛇鹫优化算法的最大似然DOA估计方法相比,所提算法的最大似然DOA估计具有收敛速度快、估计精度高、运算量小和稳健性更好的性能。展开更多
基金Project(61473298)supported by the National Natural Science Foundation of ChinaProject(2015QNA65)supported by Fundamental Research Funds for the Central Universities,China
文摘A novel approach for constructing robust Mamdani fuzzy system was proposed, which consisted of an efficiency robust estimator(partial robust M-regression, PRM) in the parameter learning phase of the initial fuzzy system, and an improved subtractive clustering algorithm in the fuzzy-rule-selecting phase. The weights obtained in PRM, which gives protection against noise and outliers, were incorporated into the potential measure of the subtractive cluster algorithm to enhance the robustness of the fuzzy rule cluster process, and a compact Mamdani-type fuzzy system was established after the parameters in the consequent parts of rules were re-estimated by partial least squares(PLS). The main characteristics of the new approach were its simplicity and ability to construct fuzzy system fast and robustly. Simulation and experiment results show that the proposed approach can achieve satisfactory results in various kinds of data domains with noise and outliers. Compared with D-SVD and ARRBFN, the proposed approach yields much fewer rules and less RMSE values.
基金This project is supported by the General Program of the National Natural Science Foundation of China(62073227)the National Natural Science Foundation of China(61927805 and 61903359).
文摘The atomic force microscope(AFM)can measure nanoscale morphology and mechanical properties and has a wide range of applications.The traditional method for measuring the mechanical properties of a sample does so for the longitudinal and transverse properties separately,ignoring the coupling between them.In this paper,a data processing and multidimensional mechanical information extraction algorithm for the composite mode of peak force tapping and torsional resonance is proposed.On the basis of a tip–sample interaction model for the AFM,longitudinal peak force data are used to decouple amplitude and phase data of transverse torsional resonance,accurately identify the tip–sample longitudinal contact force in each peak force cycle,and synchronously obtain the corresponding characteristic images of the transverse amplitude and phase.Experimental results show that the measured longitudinal mechanical characteristics are consistent with the transverse amplitude and phase characteristics,which verifies the effectiveness of the method.Thus,a new method is provided for the measurement of multidimensional mechanical characteristics using the AFM.
文摘针对矢量水听器阵列信号波达方向(Direction of Arrival,DOA)估计中存在的估计精度不高、运算量大的问题,提出了一种改进蛇鹫优化算法的最大似然DOA估计方法。采用了4种策略对蛇鹫优化算法进行改进,在种群初始化时利用佳点集策略进行改进,能够更加均匀地在搜索空间得到初始种群解,提高种群多样性;在进行位置更新时,引入减法平均优化器和柯西策略能够扩大搜索范围,从而跳出局部最优;引入黄金正弦策略,不断向最优位置进行搜索,提高了算法的估计精度。将所提算法应用于最大似然DOA估计,实验结果表明:与灰狼优化算法、粒子群算法、正弦余弦算法、光学显微镜算法、蛇鹫优化算法的最大似然DOA估计方法相比,所提算法的最大似然DOA估计具有收敛速度快、估计精度高、运算量小和稳健性更好的性能。
