A concept of the independent-continuous topological variable is proposed to establish its corresponding smooth model of structural topological optimization. The method can overcome difficulties that are encountered in...A concept of the independent-continuous topological variable is proposed to establish its corresponding smooth model of structural topological optimization. The method can overcome difficulties that are encountered in conventional models and algorithms for the optimization of the structural topology. Its application to truss topological optimization with stress and displacement constraints is satisfactory, with convergence faster than that of sectional optimizations.展开更多
目的:观察压抑膜与传统遮盖对轻中度屈光不正性弱视双眼视功能恢复的作用。方法:选取2016-05-01/08-30在我院视光中心确诊并配合治疗的6~8岁30例双眼屈光不正性轻中度屈光性弱视患儿,试验组患儿15例30眼采用Bangerter压抑膜压抑患儿相...目的:观察压抑膜与传统遮盖对轻中度屈光不正性弱视双眼视功能恢复的作用。方法:选取2016-05-01/08-30在我院视光中心确诊并配合治疗的6~8岁30例双眼屈光不正性轻中度屈光性弱视患儿,试验组患儿15例30眼采用Bangerter压抑膜压抑患儿相对好眼,使好眼视力压抑后比差眼视力差半行至一行,对照组患儿15例30眼的相对好眼定量遮盖。两组均每周2次来我院视光中心进行系统视功能康复训练,持续3mo。结果:试验组与对照组治疗前立体视、弱视眼的调节幅度(amplitude of accommodation,AMP)、调节灵敏度(accommodating facility,AF)、负相对调节(negative relative accommodation,NRA)、正相对调节(positive relative accommodation,PRA)、双眼集合近点(convergence near points,NPC)对比差异无统计学意义(P>0.05),两组治疗后立体视、AMP、AF、PRA、NPC差异有统计学意义(P<0.05),NRA差异无统计学意义(P>0.05)。结论:轻中度屈光不正性弱视患儿使用压抑膜与传统遮盖治疗在双眼视功能的对比中,Bangerter压抑膜组双眼立体视、AMP、AF、PRA、NPC等各项视功能数据明显优于传统遮盖组,NRA与传统遮盖治疗无差异。展开更多
探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结...探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结果表明选取合适的预处理方法,采用DGHM和STT多小波对GPR图象去噪可获得比其他方法更好的效果。展开更多
For being able to deal with the nonlinear or non-Gaussian problems, particle filters have been studied by many researchers. Based on particle filter, the extended Kalman filter （EKF） proposal function is applied to ...For being able to deal with the nonlinear or non-Gaussian problems, particle filters have been studied by many researchers. Based on particle filter, the extended Kalman filter （EKF） proposal function is applied to Bayesian target tracking. Markov chain Monte Carlo （MCMC） method, the resampling step, ere novel techniques are also introduced into Bayesian target tracking. And the simulation results confirm the improved particle filter with these techniques outperforms the basic one.展开更多
基金The project supported by State Key Laboratory of Structural Analyses of Industrial Equipment
文摘A concept of the independent-continuous topological variable is proposed to establish its corresponding smooth model of structural topological optimization. The method can overcome difficulties that are encountered in conventional models and algorithms for the optimization of the structural topology. Its application to truss topological optimization with stress and displacement constraints is satisfactory, with convergence faster than that of sectional optimizations.
文摘目的:观察压抑膜与传统遮盖对轻中度屈光不正性弱视双眼视功能恢复的作用。方法:选取2016-05-01/08-30在我院视光中心确诊并配合治疗的6~8岁30例双眼屈光不正性轻中度屈光性弱视患儿,试验组患儿15例30眼采用Bangerter压抑膜压抑患儿相对好眼,使好眼视力压抑后比差眼视力差半行至一行,对照组患儿15例30眼的相对好眼定量遮盖。两组均每周2次来我院视光中心进行系统视功能康复训练,持续3mo。结果:试验组与对照组治疗前立体视、弱视眼的调节幅度(amplitude of accommodation,AMP)、调节灵敏度(accommodating facility,AF)、负相对调节(negative relative accommodation,NRA)、正相对调节(positive relative accommodation,PRA)、双眼集合近点(convergence near points,NPC)对比差异无统计学意义(P>0.05),两组治疗后立体视、AMP、AF、PRA、NPC差异有统计学意义(P<0.05),NRA差异无统计学意义(P>0.05)。结论:轻中度屈光不正性弱视患儿使用压抑膜与传统遮盖治疗在双眼视功能的对比中,Bangerter压抑膜组双眼立体视、AMP、AF、PRA、NPC等各项视功能数据明显优于传统遮盖组,NRA与传统遮盖治疗无差异。
文摘探讨了多小波函数及其预处理方法对探地雷达(ground penetrating radar—GPR)图象去噪性能的影响,在Donoho D L和Johnstone I M提出的小波阈值去噪方法的基础上提出了一个改进的阈值函数,并对实际的GPR图象进行阈值化处理和对比分析,结果表明选取合适的预处理方法,采用DGHM和STT多小波对GPR图象去噪可获得比其他方法更好的效果。
基金This project was supported by the National Natural Science Foundation of China (50405017) .
文摘For being able to deal with the nonlinear or non-Gaussian problems, particle filters have been studied by many researchers. Based on particle filter, the extended Kalman filter （EKF） proposal function is applied to Bayesian target tracking. Markov chain Monte Carlo （MCMC） method, the resampling step, ere novel techniques are also introduced into Bayesian target tracking. And the simulation results confirm the improved particle filter with these techniques outperforms the basic one.
