目的:探讨行为节点线性引导法在接受阿替普酶溶栓治疗急性脑梗死患者中的应用效果。方法:选取2018年4月1日~2020年5月31日就诊的接受阿替普酶溶栓治疗的急性脑梗死患者98例,采用随机数字表法分为对照组和观察组各49例,对照组行常规护理...目的:探讨行为节点线性引导法在接受阿替普酶溶栓治疗急性脑梗死患者中的应用效果。方法:选取2018年4月1日~2020年5月31日就诊的接受阿替普酶溶栓治疗的急性脑梗死患者98例,采用随机数字表法分为对照组和观察组各49例,对照组行常规护理,观察组在常规护理基础上实施行为节点线性引导法;比较两组溶栓前后神经功能缺损程度[采用神经功能缺损评分(NIHSS)]、就诊-溶栓时间(DNT)、并发症持续时间、并发症发生情况。结果:溶栓后24 h、14 d,两组NIHSS评分均低于溶栓前(P<0.01),且观察组溶栓后14 d NIHSS评分低于对照组(P<0.01);观察组DNT、皮肤及黏膜出血时间、意识恢复时间均短于对照组(P<0.01);观察组颅内出血、肺部感染、失语等并发症发生率低于对照组(P<0.01)。结论:行为节点线性引导法用于接受阿替普酶溶栓治疗的急性脑梗死患者能够改善其神经功能,缩短DNT及皮肤、黏膜出血时间,促进意识恢复,降低颅内出血、肺部感染、失语等重症并发症发生风险。展开更多
Modern automotive petrol engine performance is significantly affected by effective tune-up. Current practice of engine tune-up relies on the experience of the automotive engineer, and tune-up is usually done by trial-...Modern automotive petrol engine performance is significantly affected by effective tune-up. Current practice of engine tune-up relies on the experience of the automotive engineer, and tune-up is usually done by trial-and-error method and then the vehicle engine is run on the dynamometer to show the actual engine performance. Obviously the current practice involves a large amount of time and money, and then may even fail to tune up the engine optimally because a formal performance model of the engine has not been determined yet. With an emerging technique, Support Vector Machines (SVM), the approximate per- formance model of a petrol vehicle engine can be determined by training the sample engine performance data acquired from the dynamometer. The number of dynamometer tests for an engine tune-up can therefore be reduced because the estimated engine performance model can replace the dynamometer tests to a certain extent. In this paper, the construction, validation and accuracy of the model are discussed. The study showed that the predicted results agree well with the actual test results. To illustrate the significance of the SVM methodology, the results were also compared with that regressed using multilayer feedforward neural networks.展开更多
To eliminate the perturbation of interceptor detection induced by aerodynamic heating,the head pursuit (HP) guidance law for three-dimensional interception was presented. The guidance law positioned the interceptor ah...To eliminate the perturbation of interceptor detection induced by aerodynamic heating,the head pursuit (HP) guidance law for three-dimensional interception was presented. The guidance law positioned the interceptor ahead of the target on its flight trajectory,and the speed of interceptor was required to be lower than that of the target. On the basis of a novel head pursuit three-dimensional guidance model,a nonlinear guidance law was developed based on smooth sliding mode control theory. At the same time,a special observer was designed to estimate the target acceleration,and a numerical example on maneuvering ballistic target interception verified the effectiveness of the presented guidance law.展开更多
文摘目的:探讨行为节点线性引导法在接受阿替普酶溶栓治疗急性脑梗死患者中的应用效果。方法:选取2018年4月1日~2020年5月31日就诊的接受阿替普酶溶栓治疗的急性脑梗死患者98例,采用随机数字表法分为对照组和观察组各49例,对照组行常规护理,观察组在常规护理基础上实施行为节点线性引导法;比较两组溶栓前后神经功能缺损程度[采用神经功能缺损评分(NIHSS)]、就诊-溶栓时间(DNT)、并发症持续时间、并发症发生情况。结果:溶栓后24 h、14 d,两组NIHSS评分均低于溶栓前(P<0.01),且观察组溶栓后14 d NIHSS评分低于对照组(P<0.01);观察组DNT、皮肤及黏膜出血时间、意识恢复时间均短于对照组(P<0.01);观察组颅内出血、肺部感染、失语等并发症发生率低于对照组(P<0.01)。结论:行为节点线性引导法用于接受阿替普酶溶栓治疗的急性脑梗死患者能够改善其神经功能,缩短DNT及皮肤、黏膜出血时间,促进意识恢复,降低颅内出血、肺部感染、失语等重症并发症发生风险。
文摘Modern automotive petrol engine performance is significantly affected by effective tune-up. Current practice of engine tune-up relies on the experience of the automotive engineer, and tune-up is usually done by trial-and-error method and then the vehicle engine is run on the dynamometer to show the actual engine performance. Obviously the current practice involves a large amount of time and money, and then may even fail to tune up the engine optimally because a formal performance model of the engine has not been determined yet. With an emerging technique, Support Vector Machines (SVM), the approximate per- formance model of a petrol vehicle engine can be determined by training the sample engine performance data acquired from the dynamometer. The number of dynamometer tests for an engine tune-up can therefore be reduced because the estimated engine performance model can replace the dynamometer tests to a certain extent. In this paper, the construction, validation and accuracy of the model are discussed. The study showed that the predicted results agree well with the actual test results. To illustrate the significance of the SVM methodology, the results were also compared with that regressed using multilayer feedforward neural networks.
文摘To eliminate the perturbation of interceptor detection induced by aerodynamic heating,the head pursuit (HP) guidance law for three-dimensional interception was presented. The guidance law positioned the interceptor ahead of the target on its flight trajectory,and the speed of interceptor was required to be lower than that of the target. On the basis of a novel head pursuit three-dimensional guidance model,a nonlinear guidance law was developed based on smooth sliding mode control theory. At the same time,a special observer was designed to estimate the target acceleration,and a numerical example on maneuvering ballistic target interception verified the effectiveness of the presented guidance law.
