期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
Cointegration analysis with structural changes between consumption and economic growth in China 被引量:3
1
作者 郭建平 何建敏 《Journal of Southeast University(English Edition)》 EI CAS 2006年第2期238-241,共4页
In order to investigate the existence of a stable long-run equilibrium relationship between economic growth and consumption in China, the relationship between the gross domestic product (GDP) and consumption in Chin... In order to investigate the existence of a stable long-run equilibrium relationship between economic growth and consumption in China, the relationship between the gross domestic product (GDP) and consumption in China was investigated by the cointegration analysis method. Using the Engle-Granger (EG) test and considering the possibility of structural changes, the impact of external economic shocks on the long-run equilibrium relationship between economic growth and consumption in China was analyzed. Analysis results show that without considering structural changes, the EG test cannot detect cointegration in the series subjected to structural changes; in considering structural changes, cointegration is successfully detected by specifying the dummy variable. In addition, the error correction models were constructed in different periods. This study verifies the existence of a long-run equilibrium relationship between economic growth and consumption in China, and this relationship has significantly changed in 1989 and 1997, respectively. 展开更多
关键词 cointegration with structural changes economic growth dummy variable CONSUMPTION error correction model
下载PDF
On a Class of Second Order Differential Inequality with Continuous Distributed Deviating Arguments
2
作者 王培光 葛渭高 《Journal of Beijing Institute of Technology》 EI CAS 1999年第4期337-341,共5页
Aim To study properties of solutions to a class of second order differential inequality with continuous distributed deviating arguments. Methods A direct analysis technique was used. Results and Conclusion Some suf... Aim To study properties of solutions to a class of second order differential inequality with continuous distributed deviating arguments. Methods A direct analysis technique was used. Results and Conclusion Some sufficient conditions that ensure a class of second order delay differential inequality having no eventually positive solutions were obtained, which generalized some given results. Using the results, some oscillatory criteria for solutions of the hyperbolic equation with distributed deviating arguments can be established. 展开更多
关键词 INEQUALITY distributed deviating arguments positive solution
下载PDF
Iterative regularization method for image denoising with adaptive scale parameter
3
作者 李文书 骆建华 +2 位作者 刘且根 何芳芳 魏秀金 《Journal of Southeast University(English Edition)》 EI CAS 2010年第3期453-456,共4页
In order to decrease the sensitivity of the constant scale parameter, adaptively optimize the scale parameter in the iteration regularization model (IRM) and attain a desirable level of applicability for image denoi... In order to decrease the sensitivity of the constant scale parameter, adaptively optimize the scale parameter in the iteration regularization model (IRM) and attain a desirable level of applicability for image denoising, a novel IRM with the adaptive scale parameter is proposed. First, the classic regularization item is modified and the equation of the adaptive scale parameter is deduced. Then, the initial value of the varying scale parameter is obtained by the trend of the number of iterations and the scale parameter sequence vectors. Finally, the novel iterative regularization method is used for image denoising. Numerical experiments show that compared with the IRM with the constant scale parameter, the proposed method with the varying scale parameter can not only reduce the number of iterations when the scale parameter becomes smaller, but also efficiently remove noise when the scale parameter becomes bigger and well preserve the details of images. 展开更多
关键词 iterative regularization model (IRM) total variation varying scale parameter image denoising
下载PDF
厄尼诺现象与山东降水的关系
4
作者 周英亭 《山东气象》 1989年第4期21-23,4,共4页
本文分析了厄尼诺现象与北半球环流的关系,提出了当厄尼诺现象发生时,北半球环流形势发生显著变化,并利用山东1951—87年资料分析了厄尼诺年及反厄尼诺年与山东降水的关系。 一 厄尼诺现象是海洋和大气相互作用的一个突出表现,它不只是... 本文分析了厄尼诺现象与北半球环流的关系,提出了当厄尼诺现象发生时,北半球环流形势发生显著变化,并利用山东1951—87年资料分析了厄尼诺年及反厄尼诺年与山东降水的关系。 一 厄尼诺现象是海洋和大气相互作用的一个突出表现,它不只是赤道东太平洋的局部现象。 展开更多
关键词 环流形势 赤道东太平洋 天气气候 大气相互作用 极涡 江淮流域 平均环流 强度指数 正变差 优势频率
下载PDF
Quantum BCH Codes Based on Spectral Techniques
5
作者 GUO Ying ZENG Gui-Hua 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第2期283-286,共4页
When the time variable in quantum signal processing is discrete, the Fourier transform exists on the vector space of n-tuples over the Galois field F2, which plays an important role in the investigation of quantum sig... When the time variable in quantum signal processing is discrete, the Fourier transform exists on the vector space of n-tuples over the Galois field F2, which plays an important role in the investigation of quantum signals. By using Fourier transforms, the idea of quantum coding theory can be described in a setting that is much different from that seen that far. Quantum BCH codes can be defined as codes whose quantum states have certain specified consecutive spectral components equal to zero and the error-correcting ability is also described by the number of the consecutive zeros. Moreover, the decoding of quantum codes can be described spectrally with more efficiency. 展开更多
关键词 Fourier transform BCH code quantum error-correction code
下载PDF
A stepwise camera calibration method incorporating compensation for eccentricity error
6
作者 WEI Jiaqi WANG Peng +4 位作者 LI Yue LI Mojing LI Lin SUN Changku FU Luhua 《Journal of Measurement Science and Instrumentation》 CAS 2024年第4期445-457,共13页
In visual measurement,high-precision camera calibration often employs circular targets.To address issues in mainstream methods,such as the eccentricity error of the circle from using the circle’s center for calibrati... In visual measurement,high-precision camera calibration often employs circular targets.To address issues in mainstream methods,such as the eccentricity error of the circle from using the circle’s center for calibration,overfitting or local minimum from fullparameter optimization,and calibration errors due to neglecting the center of distortion,a stepwise camera calibration method incorporating compensation for eccentricity error was proposed to enhance monocular camera calibration precision.Initially,the multiimage distortion correction method calculated the common center of distortion and coefficients,improving precision,stability,and efficiency compared to single-image distortion correction methods.Subsequently,the projection point of the circle’s center was compared with the center of the contour’s projection to iteratively correct the eccentricity error,leading to more precise and stable calibration.Finally,nonlinear optimization refined the calibration parameters to minimize reprojection error and boosts precision.These processes achieved stepwise camera calibration,which enhanced robustness.In addition,the module comparison experiment showed that both the eccentricity error compensation and the camera parameter optimization could improve the calibration precision,but the latter had a greater impact.The combined use of the two methods further improved the precision and stability.Simulations and experiments confirmed that the proposed method achieved high precision,stability,and robustness,suitable for high-precision visual measurements. 展开更多
关键词 camera calibration error compensation eccentricity error distortion correction center of distortion optical measurement
下载PDF
Regularity of discrete multisublinear fractional maximal functions 被引量:2
7
作者 LIU Feng WU HuoXiong 《Science China Mathematics》 SCIE CSCD 2017年第8期1461-1476,共16页
We investigate the regularity properties of discrete multisublinear fractional maximal operators,both in the centered and uncentered versions.We prove that these operators are bounded and continuous from l^1(Z^d)... We investigate the regularity properties of discrete multisublinear fractional maximal operators,both in the centered and uncentered versions.We prove that these operators are bounded and continuous from l^1(Z^d)×l^1(Z^d)×…×l^1(Z^d)to BV(Z^d),where BV(Z^d)is the set of functions of bounded variation defined on Zd.Moreover,two pointwise estimates for the partial derivatives of discrete multisublinear fractional maximal functions are also given.As applications,we present the regularity properties for discrete fractional maximal operator,which are new even in the linear case. 展开更多
关键词 discrete multisublinear fractional maximal operator discrete fractional maximal operator bounded variation CONTINUITY
原文传递
Monotone rank estimation of transformation models with length-biased and right-censored data 被引量:8
8
作者 CHEN XiaoPing SHI JianHua ZHOU Yong 《Science China Mathematics》 SCIE CSCD 2015年第10期2055-2068,共14页
This paper considers the monotonic transformation model with an unspecified transformation function and an unknown error function, and gives its monotone rank estimation with length-biased and rightcensored data. The ... This paper considers the monotonic transformation model with an unspecified transformation function and an unknown error function, and gives its monotone rank estimation with length-biased and rightcensored data. The estimator is shown to be√n-consistent and asymptotically normal. Numerical simulation studies reveal good finite sample performance and the estimator is illustrated with the Oscar data set. The variance can be estimated by a resampling method via perturbing the U-statistics objective function repeatedly. 展开更多
关键词 monotone rank estimation length-biased data right-censored data random weighting transformation model
原文传递
ON ASYMPTOTIC NORMALITY OF PARAMETERS IN LINEAR EV MODEL 被引量:3
9
作者 ZHANG SANGUO CHEN XIRUHua Lee-Keng Institue for applied Mathematics and Information Science, Graduate School of ChineseAcademy of Sciences, Beijing 100039, China. Department of Mathematics, Graduate School of Chinese Academy of Sciences, 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2002年第4期495-506,共12页
This paper studies the parameter estimation of one dimensional linear errors-in-variables(EV) models in the case that replicated observations are available in some experimental points.Asymptotic normality is establis... This paper studies the parameter estimation of one dimensional linear errors-in-variables(EV) models in the case that replicated observations are available in some experimental points.Asymptotic normality is established under mild conditions, and the parameters entering the asymptotic variance are consistently estimated to render the result useable in construction of large-sample confidence regions. 展开更多
关键词 Errors-in-Variables model Asymptotic normality Replicated observations
原文传递
Magnetic fluid based deformable mirror for aberration correction of liquid telescope
10
作者 吴君秋 吴智政 +2 位作者 孔祥会 张柱 刘梅 《Optoelectronics Letters》 EI 2017年第2期90-94,共5页
A magnetic fluid based deformable mirror(MFDM) that could produce a large stroke more than 100 μm is designed and demonstrated experimentally with respect to the characteristics of the aberration of the liquid telesc... A magnetic fluid based deformable mirror(MFDM) that could produce a large stroke more than 100 μm is designed and demonstrated experimentally with respect to the characteristics of the aberration of the liquid telescope. Its aberration correction performance is verified by the co-simulation using COMSOL and MATLAB. Furthermore, the stroke performance of the MFDM and the decentralized linear quadratic Gaussian(LQG) mirror surface control approach are experimentally evaluated with a prototype of MFDM in an adaptive optics system to show its potential application for the large aberration correction of liquid telescopes. 展开更多
关键词 aberration mirror correction decentralized wavefront verified optics quadratic rotation telescope
原文传递
A variable differential consensus method for improving the quantitative near-infrared spectroscopic analysis 被引量:1
11
作者 DU GuoRong CAI WenSheng SHAO XueGuang 《Science China Chemistry》 SCIE EI CAS 2012年第9期1946-1952,共7页
Consensus methods have presented promising tools for improving the reliability of quantitative models in near-infrared(NIR) spectroscopic analysis.A strategy for improving the performance of consensus methods in multi... Consensus methods have presented promising tools for improving the reliability of quantitative models in near-infrared(NIR) spectroscopic analysis.A strategy for improving the performance of consensus methods in multivariate calibration of NIR spectra is proposed.In the approach,a subset of non-collinear variables is generated using successive projections algorithm(SPA) for each variable in the reduced spectra by uninformative variables elimination(UVE).Then sub-models are built using the variable subsets and the calibration subsets determined by Monte Carlo(MC) re-sampling,and the sub-model that produces minimal error in cross validation is selected as a member model.With repetition of the MC re-sampling,a series of member models are built and a consensus model is achieved by averaging all the member models.Since member models are built with the best variable subset and the randomly selected calibration subset,both the quality and the diversity of the member models are insured for the consensus model.Two NIR spectral datasets of tobacco lamina are used to investigate the proposed method.The superiority of the method in both accuracy and reliability is demonstrated. 展开更多
关键词 near infrared spectroscopy multivariate calibration consensus model variable selection uninformative variable elim-ination successive projections algorithm
原文传递
ON ASYMPTOTIC NORMALITY OF PARAMETERS IN MULTIPLE LINEAR ERRORS-IN-VARIABLES MODEL
12
作者 ZHANGSanguo CHENXiru 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2003年第4期438-445,共8页
This paper studies the parameter estimation of multiple dimensional linear errors-in-variables (EV) models in the case where replicated observations are available in some experimental points. Asymptotic normality is e... This paper studies the parameter estimation of multiple dimensional linear errors-in-variables (EV) models in the case where replicated observations are available in some experimental points. Asymptotic normality is established under mild conditions, and the parameters entering the asymptotic variance are consistently estimated to render the result useable in the construction of large-sample confidence regions. 展开更多
关键词 errors-in-variables model asymptotic normality replicated observations
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部