Objective To compare the postoperative outcomes of patients with the diagnostic univentricular heart undergoing lateral tunnel （LT） operation with extracardiac conduit （EC） operation. Methods- From June 1996 to Ju...Objective To compare the postoperative outcomes of patients with the diagnostic univentricular heart undergoing lateral tunnel （LT） operation with extracardiac conduit （EC） operation. Methods- From June 1996 to July 2007, 114 consecutive patients with a single ventricle underwent total cavopulmonary connection （TCPC） in Children＇s Heart Center, lAniversity Hospital Giessen and Marburg GmbH, Germany. A LT was performed in 19 （16.7%） patients, and an EC in 95 （83.3%） patients. The mean age of EC group was 50.8±31.6 （ranging from 22 to 212） months, and that of LT group was 61.5±41.2 （ranging from 30 to 168） months. Early and midterm outcomes of two groups were analyzed.Results One died in LT group （5.3%） and three in EC group （3.2%）. The overall mortality was 3.5%. There was no significant difference in mortality between EC-and-LT groups （P〉0.05）. The postoperative pulmonary arterial pressure, oxygen saturation, and effusion time of two groups had no significant difference （all P〉0.05）. No significant difference in the occurrences of complications （arrhythmias, enteropathy, and thrombosis） was found between two groups after operation （P〉0.05）. Conclusions There seems no difference between LT and EC in the clinical results in the early and middle postoperative stage. Glenn anastomosis followed by an EC seems to have some advantages.展开更多
This paper addresses the problem of channel estimation in 5G-enabled vehicular-to-vehicular(V2V) channels with high-mobility environments and non-stationary feature. Considering orthogonal frequency division multiplex...This paper addresses the problem of channel estimation in 5G-enabled vehicular-to-vehicular(V2V) channels with high-mobility environments and non-stationary feature. Considering orthogonal frequency division multiplexing(OFDM) system, we perform extended Kalman filter(EKF) for channel estimation in conjunction with Iterative Detector & Decoder(IDD) at the receiver to improve the estimation accuracy. The EKF is proposed for jointly estimating the channel frequency response and the time-varying time correlation coefficients. And the IDD structure is adopted to reduce the estimation errors in EKF. The simulation results show that, compared with traditional methods, the proposed method effectively promotes the system performance.展开更多
文摘Objective To compare the postoperative outcomes of patients with the diagnostic univentricular heart undergoing lateral tunnel （LT） operation with extracardiac conduit （EC） operation. Methods- From June 1996 to July 2007, 114 consecutive patients with a single ventricle underwent total cavopulmonary connection （TCPC） in Children＇s Heart Center, lAniversity Hospital Giessen and Marburg GmbH, Germany. A LT was performed in 19 （16.7%） patients, and an EC in 95 （83.3%） patients. The mean age of EC group was 50.8±31.6 （ranging from 22 to 212） months, and that of LT group was 61.5±41.2 （ranging from 30 to 168） months. Early and midterm outcomes of two groups were analyzed.Results One died in LT group （5.3%） and three in EC group （3.2%）. The overall mortality was 3.5%. There was no significant difference in mortality between EC-and-LT groups （P〉0.05）. The postoperative pulmonary arterial pressure, oxygen saturation, and effusion time of two groups had no significant difference （all P〉0.05）. No significant difference in the occurrences of complications （arrhythmias, enteropathy, and thrombosis） was found between two groups after operation （P〉0.05）. Conclusions There seems no difference between LT and EC in the clinical results in the early and middle postoperative stage. Glenn anastomosis followed by an EC seems to have some advantages.
基金supported by the National Natural Science Foundation of China (No.61501066,No.61572088,No.61701063)Chongqing Frontier and Applied Basic Research Project (No.cstc2015jcyjA40003,No.cstc2017jcyjAX0026,No.cstc2016jcyjA0209)+1 种基金the Open Fund of the State Key Laboratory of Integrated Services Networks (No.ISN16-03)the Fundamental Research Funds for the Central Universities (No.106112017CDJXY 500001)
文摘This paper addresses the problem of channel estimation in 5G-enabled vehicular-to-vehicular(V2V) channels with high-mobility environments and non-stationary feature. Considering orthogonal frequency division multiplexing(OFDM) system, we perform extended Kalman filter(EKF) for channel estimation in conjunction with Iterative Detector & Decoder(IDD) at the receiver to improve the estimation accuracy. The EKF is proposed for jointly estimating the channel frequency response and the time-varying time correlation coefficients. And the IDD structure is adopted to reduce the estimation errors in EKF. The simulation results show that, compared with traditional methods, the proposed method effectively promotes the system performance.
