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Search Results: 1 - 10 of 124763 matches for " Zhuang Xue-bin Lu Ming-quan Feng Zhen-ming "
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A Numerically Robust and Low-complexity Method of Signal Subspace Estimation
一种数值稳健且低复杂度的信号子空间估计新方法

Zhuang Xue-bin Lu Ming-quan Feng Zhen-ming,
庄学彬
,陆明泉,冯振明

电子与信息学报 , 2011,
Abstract: A numerically robust and low-complexity method of signal subspace estimation is proposed in the paper. The transform matrix to tridiagonalize the covariance matrix of observation data is constructed in the forward recursion of multistage Wiener filter (MSWF), and its columns span the signal subspace. Compared with the traditional method of correlation subtractive structure, the forward recursion in the method is implemented with the Householder unitary transform. Therefore, it strengthens significantly the orthogonality of basis vectors in the signal subspace and improves the numerical robustness, especially in the finite-precision implementation. Besides, a method of calculating the transform matrix is proposed to reduce the computational complexity based on the unitary property of the Householder matrix and backward accumulation of matrices. Finally, simulation results demonstrate the numerical robustness and computational efficiency of the proposed method.
Study on GPS L2C Acquisition Algorithm and Performance Analysis
GPS L2C捕获算法研究及性能分析

Li Cheng-jun,Lu Ming-quan,Feng Zhen-ming,Zhang Qi,
李成军
,陆明泉,冯振明,张祺

电子与信息学报 , 2010,
Abstract: L2C is a new civilian's signal,broadcast by the modernized GPS Block IIR-M satellites.In order to access acquisition performance of GPS L2C signal,the algorithm of L2C signal is discussed firstly in the paper.That is,after acquisition of CM code by using locally generated Return to Zero(RZ) CM code and FFT,the fixed relationships between CM code and CL code are used to realize acquisition of CL code.Simulation shows that this method can complete acquisition of L2C quickly and can be applied to L2C software ...
Modeling multivariate conditional variance skewness kurtosis
多维条件方差偏度峰度建模

WANG Chun-feng,ZHUANG Hong-gang,FANG Zhen-ming,LU Tao,
王春峰
,庄泓刚,房振明,卢涛

系统工程理论与实践 , 2010,
Abstract: Considering factors of anticipation and volatility,to measure the dynamic character of higher moments risk and investigate impacts of the risk on multi-financial markets or assets,a model of multivariate conditional higher order moments,which can solve the problem of 'dimension disaster',was proposed with the determination of the formulas between moments and co-moments.Time-varying parameters of higher order moments were estimated using Dynamic Conditional Correlation,Autoregressive conditional density and ...
NURBS Interpolation Technology in CNC System Based on STEP-NC
基于STEP-NC的CNC系统中NURBS插补技术研究

DU Juan,TIAN Xi-tian,ZHANG Zhen-ming,ZHU Ming-quan,LI Jian-ke,
杜娟
,田锡天,张振明,朱名铨,李建克

中国图象图形学报 , 2007,
Abstract: STEP-NC is a new interface standard for data exchanging and sharing between CAD/CAM and CNC,and the CNC based on STEP-NC will be the next generation of CNC controller,which not only holds linear and circular interpolation but also possesses the capability of spline interpolation.A universal NURBS(non-uniform rational B-spline) based interpolator was designed and the interpolation technique based on constant arc increment and interpolation algorithm were inverstigated arc increment.The validity and reliability of algorithm was tested by an instance simulation and machining.
Spatially-resolved measurement of conductivity of plasma single filament generated by femtosecond laser
飞秒激光等离子体单丝导电性能的空间分辨研究

Guo Kai-Min,Gao Xun,Xue Nian-Liang,Zhao Zhen-Ming,Li Hai-Jun,Lu Yi,Lin Jing-Quan,
郭凯敏
,高勋,薛念亮,赵振明,李海军,鲁毅,林景全

物理学报 , 2011,
Abstract: 对飞秒激光等离子体单丝的导电性能进行空间分辨研究.在消除测量时引入的接触电阻的影响后,得到单丝电阻在280—630kΩ/cm范围.为了进一步研究单丝的导电性能,对单丝诱导放电能力进行了空间分辨测量.结果显示,最低放电阈值降低至自发放电的~50%.从每段细丝的电阻和诱导放电阈值的空间分布看出:在成丝阶段,二者的变化趋势基本一致,细丝的电阻值和放电阈值均在焦点附近出现迅速下降.将每段细丝的电阻和放电阈值相对应,建立了细丝诱导放电阈值-电阻的线性拟合关系,证实了细丝电阻对放电阈值的影响.
The research of stock price manipulation through information in Chinese stock market
我国证券市场中基于信息的市场操纵行为理论研究

WANG Chun-feng,LU Tao,FANG Zhen-ming,
王春峰
,卢 涛,房振明

系统工程理论与实践 , 2008,
Abstract: 建立基于中国证券市场条件的知情交易者市场操纵模型.通过引入融资融券保证金限制,分析了知情交易者、被动型理性交易者和半理性噪音交易者的交易策略,并获得市场操纵过程中各期的均衡结果.进一步分析融资融券保证金限制、半理性噪音交易者理性程度、似真信号准确性对均衡结果的影响,并提出相应的政策建议.
Quasi-dense matching based on color Sift algorithm for 3D reconstruction
一种用于三维重建的彩色Sift准稠密匹配算法

ZHAO Lu-lu,GENG Guo-hua,ZHOU Ming-quan,WANG Xiao-feng,
赵璐璐
,耿国华,周明全,王小凤

计算机应用研究 , 2012,
Abstract: 针对复杂光照条件下Sift算法对彩色图像匹配能力较差,基于Kubelka-Munk理论,提出了一种适用于未标定图像的准稠密立体匹配算法,有助于更精确地进行三维重建。该算法首先求出彩色图像各个像素的颜色不变量,提取彩色特征点并通过构造彩色Sift特征描述子进行初匹配,采用RANSAC鲁棒算法消除误匹配生成种子点;然后依据视差约束提出一种基于视差梯度均值自适应窗口方法,根据视差梯度均值调整搜索范围;最后采用最优先原则进行区域增长。实验证明,该算法能获得比较满意的匹配效果,是一种有效的用于三维重建的准稠密匹配算法。
Multi-scale analysis on the relationship between stock index futures hedge ratio and hedging horizon
股指期货对冲比率和对冲期限关系的多尺度研究

WANG Chun-feng,Zhang Long-bin,FANG Zhen-ming,
王春峰
,张龙斌,房振明

系统工程理论与实践 , 2009,
Abstract: 为研究股指期货对冲比率与对冲期限的关系,基于小波分析推导了多尺度最优对冲比率的计算方法,揭示了期货和现货的波动性及相关性的多尺度变化导致了最优对冲比率和对冲效率多尺度变化的本质.通过对国际上具有代表性的股指期货的实证研究表明,股指期货和现货的波动性和相关性存在有规律的多尺度变化特征.其中,在高频尺度上,股指期货和现货的波动率差异较大,相关性较小.而在低频尺度上,波动率差异较小,相关性较大.进一步研究表明,波动性和相关性的多尺度变化导致了最优对冲比率及对)中效率呈相似规律的多尺度变化.
Multi-Slit Diffraction of Evanescent Electromagnetic Waves

SONG Zhen-Ming,CHEN Yong-Yao,XU Bo,LI Yan-Feng,HU Ming-Lie,XING Qi-Rong,ZHANG Zhi-Gang,CHAI Lu,WANG Qing-Yue,

中国物理快报 , 2008,
Abstract: The well-known Fraunhofer multi-slit diffraction is described as the multi-slit interference modulated by the single-slit diffraction, namely the multiplication between the single-slit diffraction factor and the multi-slit interference factor. By considering the simplified argument we show that the multi-slit diffraction of evanescent waves which are in the near-field region also has the interference and diffraction effects, and that this two-fold effect can be expressed as the convolution of the diffraction factor and the interference factor. Our conclusion could be helpful to understand the contribution of evanescent waves to the optical responses of sub-wavelength structures such as slits and grooves.
Output Characteristics of Active Recirculating Optical Pulse Replicator
有源循环式光脉冲复制系统的输出特性研究

YANG Zhen-ming,CHEN Bao-xue,FU Chang-song,ZHANG Jian-bin,CHEN Lin,
杨臻明
,陈抱雪,傅长松,张建彬,陈林

光子学报 , 2008,
Abstract: An improved scheme for replication of analogue optical pulses based on active recirculating fiber delay line (ARDL) is proposed. Low-gain erbium-doped fiber amplifier (EDFA) is used to compensate coupling and recirculating attenuation in simulation and experiment. The 31 dB SNR of 500th replicated optical pulse is achieved, with the 6.774 dB gain of EDFA and the 0.8 nm bandwidth of optical filter. Simulation and experiment results indicate that the amplified spontaneous emission (ASE) noise of EDFA results in SNR decline and amplitude attenuation of the pulse sequences. Low-gain EDFA, with noise figure less than 3 dB, optical filter and other improvement methods against ASE noise accumulation are effective methods to improve system performance.
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