It has been shown that remote monitoring of pulmonary activity can be achieved using ultra-wideband (UWB) systems, which shows promise in home healthcare,rescue,and security applications.In this paper,we first present...It has been shown that remote monitoring of pulmonary activity can be achieved using ultra-wideband (UWB) systems, which shows promise in home healthcare,rescue,and security applications.In this paper,we first present a multi-ray propagation model for UWB signal,which is traveling through the human thorax and is reflected on the air/dry-skin/fat/muscle interfaces,A geometry-based statistical channel model is then developed for simulating the reception of UWB signals in the indoor propagation environment.This model enables replication of time-varying multipath profiles due to the displacement of a human chest.Subsequently, a UWB distributed cognitive radar system (UWB-DCRS) is developed for the robust detection of chest cavity motion and the accurate estimation of respiration rate.The analytical framework can serve as a basis in the planning and evaluation of future rheasurement programs.We also provide a case study on how the antenna beamwidth affects the estimation of respiration rate based on the proposed propagation models and system architecture.展开更多
This paper presents a human body communication(HBC)transceiver for wireless body network applications.The transceiver employs on frequency shift keying(FSK)modulation and op-erates in 40 MHz-60 MHz which is the resona...This paper presents a human body communication(HBC)transceiver for wireless body network applications.The transceiver employs on frequency shift keying(FSK)modulation and op-erates in 40 MHz-60 MHz which is the resonant frequency of the human body as an antenna.It achieves high performance and stability through establish passive microstrip line and via models and active device-models.The proposed transceiver is designed and fabricated by FR4 printed cir-cuit board(PCB)process,the transceiver has the ability of configurable data rate up to 2 Mbps and it achieves-86 dBm receiving sensitivity at 2 Mbps data rate.Meanwhile,the transceiver out-put power dynamics range is 34 dB.Furthermore,with a visual interaction interface,the transceiv-er can be agility use in a variety of scenarios.Its measurements are verified on human body.The result shows that the transceiver has ability to send data from person to person by relying on hu-man body antenna radiation.The transceiver shows great prospect in wireless body area networks(WBAN)for telemedicine and emergency communication.展开更多
Background:In China,an indigenously developed electronic medication monitor(EMM)was designed and used in 138 counties from three provinces.Previous studies showed positive results on accuracy,effectiveness,acceptabili...Background:In China,an indigenously developed electronic medication monitor(EMM)was designed and used in 138 counties from three provinces.Previous studies showed positive results on accuracy,effectiveness,acceptability,and feasibility,but also found some ineffective implementations.In this paper,we assessed the effect of implementation of EMMs on treatment outcomes.Methods:The longitudinal ecological method was used at the county level with aggregate secondary programmatic data.All the notified TB cases in 138 counties were involved in this study from April 2017 to June 2019,and rifampicinresistant cases were excluded.We fitted a multilevel model to assess the relative change in the quarterly treatment success rate with increasing quarterly EMM coverage rate,in which a mixed effects maximum likelihood regression using random intercept model was applied,by adjusting for seasonal trends,population size,sociodemographic and clinical characteristics,and clustering within counties.展开更多
文摘It has been shown that remote monitoring of pulmonary activity can be achieved using ultra-wideband (UWB) systems, which shows promise in home healthcare,rescue,and security applications.In this paper,we first present a multi-ray propagation model for UWB signal,which is traveling through the human thorax and is reflected on the air/dry-skin/fat/muscle interfaces,A geometry-based statistical channel model is then developed for simulating the reception of UWB signals in the indoor propagation environment.This model enables replication of time-varying multipath profiles due to the displacement of a human chest.Subsequently, a UWB distributed cognitive radar system (UWB-DCRS) is developed for the robust detection of chest cavity motion and the accurate estimation of respiration rate.The analytical framework can serve as a basis in the planning and evaluation of future rheasurement programs.We also provide a case study on how the antenna beamwidth affects the estimation of respiration rate based on the proposed propagation models and system architecture.
基金the National Key R&D Program of China(No.2018YFC2001002)the National Natural Sci-ence Foundation of China(No.62173318)+1 种基金Shenzhen Basic Research Project(No.JCYJ20180507182231907,PIFI 2020 FYB0001)CAS Key Lab of Health Informatics.
文摘This paper presents a human body communication(HBC)transceiver for wireless body network applications.The transceiver employs on frequency shift keying(FSK)modulation and op-erates in 40 MHz-60 MHz which is the resonant frequency of the human body as an antenna.It achieves high performance and stability through establish passive microstrip line and via models and active device-models.The proposed transceiver is designed and fabricated by FR4 printed cir-cuit board(PCB)process,the transceiver has the ability of configurable data rate up to 2 Mbps and it achieves-86 dBm receiving sensitivity at 2 Mbps data rate.Meanwhile,the transceiver out-put power dynamics range is 34 dB.Furthermore,with a visual interaction interface,the transceiv-er can be agility use in a variety of scenarios.Its measurements are verified on human body.The result shows that the transceiver has ability to send data from person to person by relying on hu-man body antenna radiation.The transceiver shows great prospect in wireless body area networks(WBAN)for telemedicine and emergency communication.
文摘Background:In China,an indigenously developed electronic medication monitor(EMM)was designed and used in 138 counties from three provinces.Previous studies showed positive results on accuracy,effectiveness,acceptability,and feasibility,but also found some ineffective implementations.In this paper,we assessed the effect of implementation of EMMs on treatment outcomes.Methods:The longitudinal ecological method was used at the county level with aggregate secondary programmatic data.All the notified TB cases in 138 counties were involved in this study from April 2017 to June 2019,and rifampicinresistant cases were excluded.We fitted a multilevel model to assess the relative change in the quarterly treatment success rate with increasing quarterly EMM coverage rate,in which a mixed effects maximum likelihood regression using random intercept model was applied,by adjusting for seasonal trends,population size,sociodemographic and clinical characteristics,and clustering within counties.
