The track association problem of radar and electronic support measure （ESM） has been considered in the literature for several years. This problem is crucial for radar-to-ESM track fusion and is complicated by the pr...The track association problem of radar and electronic support measure （ESM） has been considered in the literature for several years. This problem is crucial for radar-to-ESM track fusion and is complicated by the presence of individual systematic errors and measurement errors. In order to improve the track association of radar and ESM sensors, a pseudo-linear filtering algorithm is proposed to estimate the target states and improve the stability of the filter. It is found that, however, the correct probability of radar- to-ESM track association decreases as the radar measurement error decreases, when the pseudo-linear filter is used for ESM sensor filtering. In view of the strange phenomenon, this paper analyzes the reason for it by using the statistic theory and further performs Monte Carlo simulation to verify the analysis.展开更多
We consider a class of nonsmooth convex optimization problems where the objective function is the composition of a strongly convex differentiable function with a linear mapping,regularized by the sum of both l1-norm a...We consider a class of nonsmooth convex optimization problems where the objective function is the composition of a strongly convex differentiable function with a linear mapping,regularized by the sum of both l1-norm and l2-norm of the optimization variables.This class of problems arise naturally from applications in sparse group Lasso,which is a popular technique for variable selection.An effective approach to solve such problems is by the Proximal Gradient Method(PGM).In this paper we prove a local error bound around the optimal solution set for this problem and use it to establish the linear convergence of the PGM method without assuming strong convexity of the overall objective function.展开更多
Background Coronary in-stent restenosis （ISR） is an important complication of percutaneous coronary intervention （PCI）. However, the relationship between lipoprotein associated phospholipase A2 （Lp- PLA2） level ...Background Coronary in-stent restenosis （ISR） is an important complication of percutaneous coronary intervention （PCI）. However, the relationship between lipoprotein associated phospholipase A2 （Lp- PLA2） level and coronary ISR after PCI is rarely reported. Methods 30 patients with coronary ISR after PCI were recruited as the experimental group, 63 patients without coronary ISR after PCI were served as the control group. Lp-PLA2, hypersensitive C-reactive protein （Hs-CRP） and Low density lipoprotein cholesterol （LDL-C） were mea- sured respectively. Smoking, hypertension, diabetes mellitus and other related factors were recorded. The relation-ships between these factors and restenosis of coronary stent after PCI were analyzed. Results The correlation analysis showed statistically significant （P〈0.05） between the level of Lp-PLA2, Hs-CRP and the restenosis of coronary stent after PCI, and that Lp-PLA2 level was an independent risk factor for coronary ISR after PCI. The correlation of Lp-PLA2 to ISR was superior to that of Hs-CRP to ISR. Conclusion The increased level of Lp- PLA2 is correlated to coronary ISR after PCI. Therefore, plasma level of Lp-PLA2 may be used as a clinically useful marker for coronary ISR prediction in patients undergoing PCI.展开更多
This work is an evaluation of the plant diversity of the white Wormwood formations (Artemisia herba-alba Asso.) in the steppes rangelands of the south-eastern zone of Sa?da (municipality of Maamora, Western Algeria). ...This work is an evaluation of the plant diversity of the white Wormwood formations (Artemisia herba-alba Asso.) in the steppes rangelands of the south-eastern zone of Sa?da (municipality of Maamora, Western Algeria). For this purpose, twenty-one phytoecological statements are carried out on three sample stations: an exclosure station where the white Wormwood is well developed and two other stations not protected where in one, the white Wormwood is moderately degraded and in the other one, it is strongly degraded. The factorial correspondences analysis (FCA) and the ascending hierarchical clustering (AHC) carried out on the floristic and edaphic parameters measured on these stations led to a hierarchy of the ecological factors determining the diversity of the studied plant formations with white Wormwood. The vegetation studied is marked by the dominance of the therophytes, particularly in the third station (very degraded station), while the exclosure station is essentially characterized by a high recovery rate and an important phytomass.展开更多
In the midst of a stock frenzy in China and tight monetary policy carried out by the Chinese government, what knowledge can we glean from a respected state leader, an economist and a people representative?
随着互联网技术的高速发展,人们与数字音乐的关系更加紧密,人们会依据自己的偏好以及场所选择音乐,因此如何有效管理数量庞大的音乐并对其分门别类显得尤为重要。为提高音乐分类的准确率,本文从音频中提取特征向量,运用遗传算法优化支...随着互联网技术的高速发展,人们与数字音乐的关系更加紧密,人们会依据自己的偏好以及场所选择音乐,因此如何有效管理数量庞大的音乐并对其分门别类显得尤为重要。为提高音乐分类的准确率,本文从音频中提取特征向量,运用遗传算法优化支持向量机实现音乐流派分类;从歌词中提取特征关键词,采用L A S SO降维实现文本情感分类,最终构建双模态音乐分类模型。结果表明,该分类方法准确率为73.1%,可靠性与稳定性良好,有效地避免了传统方法产生局部最优的问题。展开更多
基金supported by the National Natural Science Foundation of China (609721596103200161002006)
文摘The track association problem of radar and electronic support measure （ESM） has been considered in the literature for several years. This problem is crucial for radar-to-ESM track fusion and is complicated by the presence of individual systematic errors and measurement errors. In order to improve the track association of radar and ESM sensors, a pseudo-linear filtering algorithm is proposed to estimate the target states and improve the stability of the filter. It is found that, however, the correct probability of radar- to-ESM track association decreases as the radar measurement error decreases, when the pseudo-linear filter is used for ESM sensor filtering. In view of the strange phenomenon, this paper analyzes the reason for it by using the statistic theory and further performs Monte Carlo simulation to verify the analysis.
基金This work was partially supported by the National Natural Science Foundation of China(Nos.61179033,DMS-1015346)。
文摘We consider a class of nonsmooth convex optimization problems where the objective function is the composition of a strongly convex differentiable function with a linear mapping,regularized by the sum of both l1-norm and l2-norm of the optimization variables.This class of problems arise naturally from applications in sparse group Lasso,which is a popular technique for variable selection.An effective approach to solve such problems is by the Proximal Gradient Method(PGM).In this paper we prove a local error bound around the optimal solution set for this problem and use it to establish the linear convergence of the PGM method without assuming strong convexity of the overall objective function.
基金supported by medical science and technology research of Foshan science and technology bureau(No.2015AB000412)
文摘Background Coronary in-stent restenosis （ISR） is an important complication of percutaneous coronary intervention （PCI）. However, the relationship between lipoprotein associated phospholipase A2 （Lp- PLA2） level and coronary ISR after PCI is rarely reported. Methods 30 patients with coronary ISR after PCI were recruited as the experimental group, 63 patients without coronary ISR after PCI were served as the control group. Lp-PLA2, hypersensitive C-reactive protein （Hs-CRP） and Low density lipoprotein cholesterol （LDL-C） were mea- sured respectively. Smoking, hypertension, diabetes mellitus and other related factors were recorded. The relation-ships between these factors and restenosis of coronary stent after PCI were analyzed. Results The correlation analysis showed statistically significant （P〈0.05） between the level of Lp-PLA2, Hs-CRP and the restenosis of coronary stent after PCI, and that Lp-PLA2 level was an independent risk factor for coronary ISR after PCI. The correlation of Lp-PLA2 to ISR was superior to that of Hs-CRP to ISR. Conclusion The increased level of Lp- PLA2 is correlated to coronary ISR after PCI. Therefore, plasma level of Lp-PLA2 may be used as a clinically useful marker for coronary ISR prediction in patients undergoing PCI.
文摘This work is an evaluation of the plant diversity of the white Wormwood formations (Artemisia herba-alba Asso.) in the steppes rangelands of the south-eastern zone of Sa?da (municipality of Maamora, Western Algeria). For this purpose, twenty-one phytoecological statements are carried out on three sample stations: an exclosure station where the white Wormwood is well developed and two other stations not protected where in one, the white Wormwood is moderately degraded and in the other one, it is strongly degraded. The factorial correspondences analysis (FCA) and the ascending hierarchical clustering (AHC) carried out on the floristic and edaphic parameters measured on these stations led to a hierarchy of the ecological factors determining the diversity of the studied plant formations with white Wormwood. The vegetation studied is marked by the dominance of the therophytes, particularly in the third station (very degraded station), while the exclosure station is essentially characterized by a high recovery rate and an important phytomass.
文摘In the midst of a stock frenzy in China and tight monetary policy carried out by the Chinese government, what knowledge can we glean from a respected state leader, an economist and a people representative?
文摘随着互联网技术的高速发展,人们与数字音乐的关系更加紧密,人们会依据自己的偏好以及场所选择音乐,因此如何有效管理数量庞大的音乐并对其分门别类显得尤为重要。为提高音乐分类的准确率,本文从音频中提取特征向量,运用遗传算法优化支持向量机实现音乐流派分类;从歌词中提取特征关键词,采用L A S SO降维实现文本情感分类,最终构建双模态音乐分类模型。结果表明,该分类方法准确率为73.1%,可靠性与稳定性良好,有效地避免了传统方法产生局部最优的问题。
