目的探讨两种不同分娩体位对足月单胎初产妇分娩结局及产后盆底功能的影响.方法将本院90例阴道分娩初产妇采用前瞻性随机对照试验方法分为对照组和观察组,每组均45例.所有初产妇均按照产程标准实施分娩护理管理,对照组采用传统平卧位分...目的探讨两种不同分娩体位对足月单胎初产妇分娩结局及产后盆底功能的影响.方法将本院90例阴道分娩初产妇采用前瞻性随机对照试验方法分为对照组和观察组,每组均45例.所有初产妇均按照产程标准实施分娩护理管理,对照组采用传统平卧位分娩,观察组根据产妇个人喜好和舒适度自由选择分娩体位.比较2组初产妇分娩方式、产程时间、产后出血量、会阴无损伤率和新生儿Apgar评分等情况.产后6周进行盆底肌力检查,比较2组产后盆底功能.结果2组产后出血量、第三产程时间和新生儿1 min Apgar评分比较,差异均无统计学意义(P>0.05);观察组阴道分娩成功率100.00%,无中转剖宫产者,对照组阴道分娩成功率86.67%,中转剖宫产率13.33%,2组分娩方式比较差异有统计学意义(P<0.05);观察组第一产程时间、第二产程时间短于对照组,会阴无损伤率高于对照组,差异有统计学意义(P<0.05);产后6周盆底肌力检测显示,观察组阴道静息压(VRP)、阴道收缩压(VSP)、收缩持续时间、Ⅰ、Ⅱ类纤维强度均高于对照组,差异均有统计学意义(P<0.05).结论自由体位分娩能有效降低足月单胎初产妇中转剖宫产率、缩短产程时间和减少会阴损伤,对产妇盆底功能有较好保护作用.展开更多
This work proposes a new strategy to improve the rotor position estimation of a permanent magnet synchronous motor(PMSM) over wide speed range. Rotor position estimation of a PMSM is performed by using sliding mode ob...This work proposes a new strategy to improve the rotor position estimation of a permanent magnet synchronous motor(PMSM) over wide speed range. Rotor position estimation of a PMSM is performed by using sliding mode observer(SMO). An adaptive observer gain was designed based on Lyapunov function and applied to solve the chattering problem caused by the discontinuous function of the SMO in the wide speed range. The cascade low-pass filter(LPF) with variable cut-off frequency was proposed to reduce the chattering problem and to attenuate the filtering capability of the SMO. In addition, the phase shift caused by the filter was counterbalanced by applying the variable phase delay compensation for the whole speed area. High accuracy estimation result of the rotor position was obtained in the experiment by applying the proposed estimation strategy.展开更多
文摘目的探讨两种不同分娩体位对足月单胎初产妇分娩结局及产后盆底功能的影响.方法将本院90例阴道分娩初产妇采用前瞻性随机对照试验方法分为对照组和观察组,每组均45例.所有初产妇均按照产程标准实施分娩护理管理,对照组采用传统平卧位分娩,观察组根据产妇个人喜好和舒适度自由选择分娩体位.比较2组初产妇分娩方式、产程时间、产后出血量、会阴无损伤率和新生儿Apgar评分等情况.产后6周进行盆底肌力检查,比较2组产后盆底功能.结果2组产后出血量、第三产程时间和新生儿1 min Apgar评分比较,差异均无统计学意义(P>0.05);观察组阴道分娩成功率100.00%,无中转剖宫产者,对照组阴道分娩成功率86.67%,中转剖宫产率13.33%,2组分娩方式比较差异有统计学意义(P<0.05);观察组第一产程时间、第二产程时间短于对照组,会阴无损伤率高于对照组,差异有统计学意义(P<0.05);产后6周盆底肌力检测显示,观察组阴道静息压(VRP)、阴道收缩压(VSP)、收缩持续时间、Ⅰ、Ⅱ类纤维强度均高于对照组,差异均有统计学意义(P<0.05).结论自由体位分娩能有效降低足月单胎初产妇中转剖宫产率、缩短产程时间和减少会阴损伤,对产妇盆底功能有较好保护作用.
基金Project(2012(PS-2012-090))supported by the Pukyong National University Research Abroad Fund,Korea
文摘This work proposes a new strategy to improve the rotor position estimation of a permanent magnet synchronous motor(PMSM) over wide speed range. Rotor position estimation of a PMSM is performed by using sliding mode observer(SMO). An adaptive observer gain was designed based on Lyapunov function and applied to solve the chattering problem caused by the discontinuous function of the SMO in the wide speed range. The cascade low-pass filter(LPF) with variable cut-off frequency was proposed to reduce the chattering problem and to attenuate the filtering capability of the SMO. In addition, the phase shift caused by the filter was counterbalanced by applying the variable phase delay compensation for the whole speed area. High accuracy estimation result of the rotor position was obtained in the experiment by applying the proposed estimation strategy.
