Background:One of the main issues with pressurized metered dose inhalers(pMDI)is that some patients find it difficult to use it properly.Methods:This study was carried out to compare the effect of traditional verbal c...Background:One of the main issues with pressurized metered dose inhalers(pMDI)is that some patients find it difficult to use it properly.Methods:This study was carried out to compare the effect of traditional verbal counseling and that of adding an inhalation training device,such as Flo-Tone or Clip-Tone,along with a smartphone application on the incidence of inhalation technique mistakes and the pulmonary function of asthmatic adults and children.Results:The lung function of those in the advanced counseling group significantly improved on the second visit(p<0.001),whereas for those in the verbal counseling group,their lung function only improved on the third visit(p<0.001).For both the groups,the mean number of mistakes in regard to the steps in inhalation technique decreased significantly(p<0.001),with an overall higher percentage in the advanced counseling group.Conclusion:The use of training devices and smartphone applications in addition to traditional verbal counseling for teaching asthmatic adults and children the correct inhalation technique steps using pMDI resulted in a significant improvement in pulmonary function and a significant reduction in the number of inhalation technique mistakes,compared to traditional verbal counseling alone.展开更多
In this paper, a novel signal-to-clipping noise ratio and least squares approximation tone reservation scheme(SCR-LSA TR) is proposed to reduce the peak-to-average power ratio for orthogonal frequency division multipl...In this paper, a novel signal-to-clipping noise ratio and least squares approximation tone reservation scheme(SCR-LSA TR) is proposed to reduce the peak-to-average power ratio for orthogonal frequency division multiplexing systems. During the SCR procedure, only the element with the maximal amplitude is picked for processing, which not only decreases the algorithm complexity, but also helps to overcome the BER deterioration. With the LSA method, the amplitude of the peak-cancelling signals can approximate to that of the original clipping noise as much as possible. Through the combination of the optimization factor in the LSA method, the classic SCR method can achieve better PAPR reduction with faster convergence. Simulation results show that the proposed SCR-LSA TR scheme has less in-band distortion and smaller out-of-band spectral radiation. The BER of the proposed scheme shows a better performance especially under the 16-QAM over the additive white Gaussian noise channel.展开更多
文摘Background:One of the main issues with pressurized metered dose inhalers(pMDI)is that some patients find it difficult to use it properly.Methods:This study was carried out to compare the effect of traditional verbal counseling and that of adding an inhalation training device,such as Flo-Tone or Clip-Tone,along with a smartphone application on the incidence of inhalation technique mistakes and the pulmonary function of asthmatic adults and children.Results:The lung function of those in the advanced counseling group significantly improved on the second visit(p<0.001),whereas for those in the verbal counseling group,their lung function only improved on the third visit(p<0.001).For both the groups,the mean number of mistakes in regard to the steps in inhalation technique decreased significantly(p<0.001),with an overall higher percentage in the advanced counseling group.Conclusion:The use of training devices and smartphone applications in addition to traditional verbal counseling for teaching asthmatic adults and children the correct inhalation technique steps using pMDI resulted in a significant improvement in pulmonary function and a significant reduction in the number of inhalation technique mistakes,compared to traditional verbal counseling alone.
基金support by the National Natural Science Foundation of China (61401360)the Fundamental Research Funds for the Central Universities (3102017zy026)+1 种基金the Natural Science Basic Research Plan in Shaanxi Province of China (2016JM6017)the Scientific Research Program Funded by Shaanxi Provincial Education Department (16JK1702)
文摘In this paper, a novel signal-to-clipping noise ratio and least squares approximation tone reservation scheme(SCR-LSA TR) is proposed to reduce the peak-to-average power ratio for orthogonal frequency division multiplexing systems. During the SCR procedure, only the element with the maximal amplitude is picked for processing, which not only decreases the algorithm complexity, but also helps to overcome the BER deterioration. With the LSA method, the amplitude of the peak-cancelling signals can approximate to that of the original clipping noise as much as possible. Through the combination of the optimization factor in the LSA method, the classic SCR method can achieve better PAPR reduction with faster convergence. Simulation results show that the proposed SCR-LSA TR scheme has less in-band distortion and smaller out-of-band spectral radiation. The BER of the proposed scheme shows a better performance especially under the 16-QAM over the additive white Gaussian noise channel.
