Although the modified Goldstein filter based on the local signal-to-noise （SNR） has been proved to be superior to the classical Goldstein and Baran filters with more comprehensive filter parameter, its adaptation is...Although the modified Goldstein filter based on the local signal-to-noise （SNR） has been proved to be superior to the classical Goldstein and Baran filters with more comprehensive filter parameter, its adaptation is not always sufficient in the reduction of phase noise. In this work, the local SNR-based Goldstein filter is further developed with the improvements in the definition of the local SNR and the adaption of the filtering patch size. What＇s more, for preventing the loss of the phase signal caused by the excessive filtering, an iteration filtering operation is also introduced in this new algorithm. To evaluate the performance of the proposed algorithm, both a simulated digital elevation model （DEM） interferogram and real SAR deformation interferogram spanning the L＇ Aquila earthquake are carried out. The quantitative results from the simulated and real data reveal that up to 79.5% noises can be reduced by the new filter, indicating 9%-32% improvements over the previous local SNR-based Goldstein filter. This demonstrates that the new filter is not only equipped with sufficient adaption, but also can suppress the phase noise without the sacrifice of the phase signal.展开更多
Some optimization problems in mathematical programming can be translated to a variant variational inequality of the following form: Find a vectoru*, such that This paper presents a simple iterative method for solving ...Some optimization problems in mathematical programming can be translated to a variant variational inequality of the following form: Find a vectoru*, such that This paper presents a simple iterative method for solving this class of variational inequalities. The method can be viewed as an extension of theGoldstein's projection method. Some results of preliminary numerical experiments are given to indicate its applications.展开更多
In phase unwrapping, how to control the residues and cut lines is critical to unwrap ill-state wrapped phase map successfully. Some new concepts in phase unwrapping field are proposed. Firstly, the residues in three t...In phase unwrapping, how to control the residues and cut lines is critical to unwrap ill-state wrapped phase map successfully. Some new concepts in phase unwrapping field are proposed. Firstly, the residues in three types, i.e., singular residues, normal residues and virtual residues, are classified, which leads to some rational unwrapping paths. Secondly, some differences between cut-line and curved line are analyzed. And finally, experiment is carried out to compare our new enhanced Goldstein algorithm with the original Goldstein algorithm.展开更多
The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors,and can produce very consistent results for interferograms generat...The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors,and can produce very consistent results for interferograms generated under a wide variety of multilook factors and with very different noise level.However,the filter is a bit complicated and its application is still very limited.We present the designing and implementation of the variance-dependent Goldstein radar interferogram filtering,emphasizing on the logic flow,the generation of look-up table,the determination of filtering parameter,and the handling of edge information loss.Experiments with real interferograms are provided to demonstrate the applications of the designed filtering.Comparisons with the result of the coherence-dependent Goldstein filter show that improvements from 18.4% to 36.9% are achieved when the variance-dependent filter is used,and the noisier the interferogram,the greater the improvement.展开更多
Matthaeus and Goldstein pointed out that at high frequencies the spectral indexes of Alfv(?)nic fluctuations observed at 1 AU and 2.8 AU are very close to —5/3 (not—3/2). Burlaga, et al. showed that for increasing h...Matthaeus and Goldstein pointed out that at high frequencies the spectral indexes of Alfv(?)nic fluctuations observed at 1 AU and 2.8 AU are very close to —5/3 (not—3/2). Burlaga, et al. showed that for increasing heliocentric distance, the frequency range with the spectral indexes around —5/3 is extending to low frequencies. To make an explanation for the observed results, a theoretical study is needed. What mechanism controls the properties of the Alfv(?)nic fluctuations in the solar展开更多
世界致治与国际关系原版影印丛书国际关系经典选读(by Phil Williams,Donald M.Goldstein & Jay M.Shafritz)85.00元Classic Readings of International Relations冲突与合作：演进中的国际关系理论72．00元Conflict and Cooperatio...世界致治与国际关系原版影印丛书国际关系经典选读(by Phil Williams,Donald M.Goldstein & Jay M.Shafritz)85.00元Classic Readings of International Relations冲突与合作：演进中的国际关系理论72．00元Conflict and Cooperation:Evolving Theories of International Relatioas(by Marc A.Genest)国际政治经济学：审视全球权力与财富(by Jeffry A.Frieden,David A.Lake)60.00元International Political Economy:Perspectives on Global Power and展开更多
Goldstein et al. found in the porcine pituitary a potent opioid peptide dynorphin composed of 17 amino acids with leu-enkephalin as its N terminal sequence. In guinea pig ileum assay system, it is about 700 times more
正确解析国家间政治关系及其演化过程是开展地缘关系研究的重要基础。从大数据的角度开展地缘关系研究为该领域的探索提供了一种新的途径。国家或区域的局部政治倾向数据无法为地缘关系研究提供全面和翔实的数据支撑。论文介绍的一个全...正确解析国家间政治关系及其演化过程是开展地缘关系研究的重要基础。从大数据的角度开展地缘关系研究为该领域的探索提供了一种新的途径。国家或区域的局部政治倾向数据无法为地缘关系研究提供全面和翔实的数据支撑。论文介绍的一个全新的事件数据库GDELT(Global Database of Event,Language,Tone),它在诸多方面弥补了传统数据的不足。该数据不仅详细记录了全球范围事件的发生时间、地点、内容以及参与者信息,而且系统地对事件进行分类和评分。本文从数据内容、事件评分和分类体系三方面详细介绍GDELT数据,并总结了该数据的优势和潜在研究方向,以期为我国地缘关系研究等领域提供帮助和参考。展开更多
基金Foundation item： Projects（40974006, 40774003） supported by the National Natural Science Foundation of China Project（NCET-08-0570） supported by the Program for New Century Excellent Talents in Universities of China+2 种基金 Proj ect（2011JQ001） supported by the Fundamental Research Funds for the Central Universities of China Project（PolyU 5155/07E） supported by the Research Grants Council （RGC） of the Hong Kong Special Administrative Region, China Project（CX2011B 102） supported by the Doctoral Research Innovation of Hunan Province, China
文摘Although the modified Goldstein filter based on the local signal-to-noise （SNR） has been proved to be superior to the classical Goldstein and Baran filters with more comprehensive filter parameter, its adaptation is not always sufficient in the reduction of phase noise. In this work, the local SNR-based Goldstein filter is further developed with the improvements in the definition of the local SNR and the adaption of the filtering patch size. What＇s more, for preventing the loss of the phase signal caused by the excessive filtering, an iteration filtering operation is also introduced in this new algorithm. To evaluate the performance of the proposed algorithm, both a simulated digital elevation model （DEM） interferogram and real SAR deformation interferogram spanning the L＇ Aquila earthquake are carried out. The quantitative results from the simulated and real data reveal that up to 79.5% noises can be reduced by the new filter, indicating 9%-32% improvements over the previous local SNR-based Goldstein filter. This demonstrates that the new filter is not only equipped with sufficient adaption, but also can suppress the phase noise without the sacrifice of the phase signal.
文摘Some optimization problems in mathematical programming can be translated to a variant variational inequality of the following form: Find a vectoru*, such that This paper presents a simple iterative method for solving this class of variational inequalities. The method can be viewed as an extension of theGoldstein's projection method. Some results of preliminary numerical experiments are given to indicate its applications.
文摘In phase unwrapping, how to control the residues and cut lines is critical to unwrap ill-state wrapped phase map successfully. Some new concepts in phase unwrapping field are proposed. Firstly, the residues in three types, i.e., singular residues, normal residues and virtual residues, are classified, which leads to some rational unwrapping paths. Secondly, some differences between cut-line and curved line are analyzed. And finally, experiment is carried out to compare our new enhanced Goldstein algorithm with the original Goldstein algorithm.
基金Project(2013CB733303)supported by the National Basic Research Program of ChinaProjects(41222027,11103068,41104003)supported by the National Natural Science Foundation of China+3 种基金Project(13JJ1006)supported by Hunan Provincial Natural Science Foundation,ChinaProject(TXCL-KF2013-002)supported by the Key Laboratory of Videometric and Vision Navigation of Hunan Province,ChinaProject(SKLGED2013-2-1-E)supported by the State Key Laboratory of Geodesy and Earth’s Dynamics,ChinaProject(K201208)supported by the Key Laboratory of Earth Observation Technique of National Administration of Surveying,Mapping and Geoinformation,China
文摘The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors,and can produce very consistent results for interferograms generated under a wide variety of multilook factors and with very different noise level.However,the filter is a bit complicated and its application is still very limited.We present the designing and implementation of the variance-dependent Goldstein radar interferogram filtering,emphasizing on the logic flow,the generation of look-up table,the determination of filtering parameter,and the handling of edge information loss.Experiments with real interferograms are provided to demonstrate the applications of the designed filtering.Comparisons with the result of the coherence-dependent Goldstein filter show that improvements from 18.4% to 36.9% are achieved when the variance-dependent filter is used,and the noisier the interferogram,the greater the improvement.
基金Project supported by the National Natural Science Foundation of China
文摘Matthaeus and Goldstein pointed out that at high frequencies the spectral indexes of Alfv(?)nic fluctuations observed at 1 AU and 2.8 AU are very close to —5/3 (not—3/2). Burlaga, et al. showed that for increasing heliocentric distance, the frequency range with the spectral indexes around —5/3 is extending to low frequencies. To make an explanation for the observed results, a theoretical study is needed. What mechanism controls the properties of the Alfv(?)nic fluctuations in the solar
文摘世界致治与国际关系原版影印丛书国际关系经典选读(by Phil Williams,Donald M.Goldstein & Jay M.Shafritz)85.00元Classic Readings of International Relations冲突与合作：演进中的国际关系理论72．00元Conflict and Cooperation:Evolving Theories of International Relatioas(by Marc A.Genest)国际政治经济学：审视全球权力与财富(by Jeffry A.Frieden,David A.Lake)60.00元International Political Economy:Perspectives on Global Power and
文摘Goldstein et al. found in the porcine pituitary a potent opioid peptide dynorphin composed of 17 amino acids with leu-enkephalin as its N terminal sequence. In guinea pig ileum assay system, it is about 700 times more
文摘正确解析国家间政治关系及其演化过程是开展地缘关系研究的重要基础。从大数据的角度开展地缘关系研究为该领域的探索提供了一种新的途径。国家或区域的局部政治倾向数据无法为地缘关系研究提供全面和翔实的数据支撑。论文介绍的一个全新的事件数据库GDELT(Global Database of Event,Language,Tone),它在诸多方面弥补了传统数据的不足。该数据不仅详细记录了全球范围事件的发生时间、地点、内容以及参与者信息,而且系统地对事件进行分类和评分。本文从数据内容、事件评分和分类体系三方面详细介绍GDELT数据,并总结了该数据的优势和潜在研究方向,以期为我国地缘关系研究等领域提供帮助和参考。
