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混沌模拟信息转换——基于多射法的稀疏信号重构 被引量:3
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作者 席峰 陈胜垚 刘中 《电子与信息学报》 EI CSCD 北大核心 2013年第3期608-613,共6页
混沌压缩采样是应用混沌系统实现非线性测量的压缩采样理论。该文研究模拟信号的混沌压缩采样-混沌模拟信息转换。该转换通过稀疏信号激励混沌系统,低速采样系统输出实现;信号重构则以混沌系统参数估计理论为基础,通过稀疏正则化的非线... 混沌压缩采样是应用混沌系统实现非线性测量的压缩采样理论。该文研究模拟信号的混沌压缩采样-混沌模拟信息转换。该转换通过稀疏信号激励混沌系统,低速采样系统输出实现;信号重构则以混沌系统参数估计理论为基础,通过稀疏正则化的非线性最小二乘问题进行求解。该文将多射法(MS)与迭代再加权非线性最小二乘算法(IRNLS)结合,给出混沌模拟信息转换的MS-IRNLS信号重构算法。文中以Lorenz系统为例,仿真验证了MS-IRNLS算法的重构性能,结果表明方法的有效性。 展开更多
关键词 混沌压缩感知 模拟信息转换 多射法 稀疏 非线性最小二乘
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A multiplicative Gauss-Newton minimization algorithm:Theory and application to exponential functions 被引量:1
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作者 Anmol Gupta Sanjay Kumar 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2021年第3期370-389,共20页
Multiplicative calculus(MUC)measures the rate of change of function in terms of ratios,which makes the exponential functions significantly linear in the framework of MUC.Therefore,a generally non-linear optimization p... Multiplicative calculus(MUC)measures the rate of change of function in terms of ratios,which makes the exponential functions significantly linear in the framework of MUC.Therefore,a generally non-linear optimization problem containing exponential functions becomes a linear problem in MUC.Taking this as motivation,this paper lays mathematical foundation of well-known classical Gauss-Newton minimization(CGNM)algorithm in the framework of MUC.This paper formulates the mathematical derivation of proposed method named as multiplicative Gauss-Newton minimization(MGNM)method along with its convergence properties.The proposed method is generalized for n number of variables,and all its theoretical concepts are authenticated by simulation results.Two case studies have been conducted incorporating multiplicatively-linear and non-linear exponential functions.From simulation results,it has been observed that proposed MGNM method converges for 12972 points,out of 19600 points considered while optimizing multiplicatively-linear exponential function,whereas CGNM and multiplicative Newton minimization methods converge for only 2111 and 9922 points,respectively.Furthermore,for a given set of initial value,the proposed MGNM converges only after 2 iterations as compared to 5 iterations taken by other methods.A similar pattern is observed for multiplicatively-non-linear exponential function.Therefore,it can be said that proposed method converges faster and for large range of initial values as compared to conventional methods. 展开更多
关键词 multiplicative calculus multiplicative least square method multiplicative Newton minimization multiplicative Gauss-Newton minimization non-linear exponential functions
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水位流量曲线估计中的异方差性分析——以西江上游为例 被引量:3
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作者 顾西辉 张强 江涛 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2014年第1期73-78,共6页
基于珠江水系干流之一的西江上游14个水文测站水位流量数据,应用非线性最小二乘法(NLS)和异方差最大似然估计法(HMLE)分别绘制每个测站水位流量曲线标准残差图.结果表明:14个水文测站中有5个测站对NLS是适用的,9个测站对NLS不适用;而对... 基于珠江水系干流之一的西江上游14个水文测站水位流量数据,应用非线性最小二乘法(NLS)和异方差最大似然估计法(HMLE)分别绘制每个测站水位流量曲线标准残差图.结果表明:14个水文测站中有5个测站对NLS是适用的,9个测站对NLS不适用;而对于HMLE法,则有11个测站是适用的,仅3个测站不适用.因此,对比NLS法,HMLE法大大提高了对水位流量曲线的适用性. 展开更多
关键词 水位流量曲线 异方差性 非线性最小二乘法(nls) 异方差最大似然估计(HMLE)
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