目的探讨老年重症脑卒中患者发生多器官功能障碍综合征(multiple organ dysfunction syndrome,MODS)的危险因素。方法前瞻性选择2020年1月至2022年12月广东医科大学附属医院收治的老年重症脑卒中患者112例。根据入院后14 d内多器官功能...目的探讨老年重症脑卒中患者发生多器官功能障碍综合征(multiple organ dysfunction syndrome,MODS)的危险因素。方法前瞻性选择2020年1月至2022年12月广东医科大学附属医院收治的老年重症脑卒中患者112例。根据入院后14 d内多器官功能评分系统分为MODS组38例,非MODS组74例。根据最终预后又分为生存组33例和死亡组79例。收集患者一般临床资料、急性生理学与慢性健康状况评估Ⅱ(acute physiology and chronic health evaluation,APACHEⅡ)评分、格拉斯哥昏迷评分(Glasgow coma scale,GCS)和头颅影像学参数。采用logistic回归分析MODS发生的危险因素。结果MODS组脑卒中/脑出血、慢性阻塞性肺疾病、冠心病、吸烟、美国国立卫生研究院卒中量表(National Institute of Health Stroke Scale,NIHSS)评分、APACHEⅡ评分、多支血管病变、尿路感染、静脉血栓、出血、癫痫、心肌梗死、急性期机械通气、渗透疗法和住院病死率明显高于非MODS组,GCS明显低于非MODS组,差异有统计学意义(P<0.05,P<0.01)。二元logistic回归分析显示,NIHSS评分、APACHEⅡ评分及多支血管病变是MODS发生的独立危险因素(OR=1.124,95%CI:1.121~1.163,P=0.015;OR=1.265,95%CI:1.296~1.426,P=0.001;OR=2.532,95%CI:1.126~5.013,P=0.026)。死亡组MODS评分、APACHEⅡ评分明显高于生存组,差异有统计学意义(P<0.05)。结论老年重症脑卒中患者急性期易发生MODS。展开更多
For the typical first-order systems with time-delay,this paper explors the control capability of linear active disturbance rejection control(LADRC).Firstly,the critical time-delay of LADRC is analyzed using the freque...For the typical first-order systems with time-delay,this paper explors the control capability of linear active disturbance rejection control(LADRC).Firstly,the critical time-delay of LADRC is analyzed using the frequency-sweeping method and the Routh criterion,and the stable time-delay interval starting from zero is accurately obtained,which reveals the limitations of general LADRC on large time-delay.Then in view of the large time-delay,an LADRC controller is developed and verified to be effective,along with the robustness analysis.Finally,numerical simulations show the accuracy of critical time-delay,and demonstrate the effectiveness and robustness of the proposed controller compared with other modified LADRCs.展开更多
In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six de...In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.展开更多
文摘目的探讨老年重症脑卒中患者发生多器官功能障碍综合征(multiple organ dysfunction syndrome,MODS)的危险因素。方法前瞻性选择2020年1月至2022年12月广东医科大学附属医院收治的老年重症脑卒中患者112例。根据入院后14 d内多器官功能评分系统分为MODS组38例,非MODS组74例。根据最终预后又分为生存组33例和死亡组79例。收集患者一般临床资料、急性生理学与慢性健康状况评估Ⅱ(acute physiology and chronic health evaluation,APACHEⅡ)评分、格拉斯哥昏迷评分(Glasgow coma scale,GCS)和头颅影像学参数。采用logistic回归分析MODS发生的危险因素。结果MODS组脑卒中/脑出血、慢性阻塞性肺疾病、冠心病、吸烟、美国国立卫生研究院卒中量表(National Institute of Health Stroke Scale,NIHSS)评分、APACHEⅡ评分、多支血管病变、尿路感染、静脉血栓、出血、癫痫、心肌梗死、急性期机械通气、渗透疗法和住院病死率明显高于非MODS组,GCS明显低于非MODS组,差异有统计学意义(P<0.05,P<0.01)。二元logistic回归分析显示,NIHSS评分、APACHEⅡ评分及多支血管病变是MODS发生的独立危险因素(OR=1.124,95%CI:1.121~1.163,P=0.015;OR=1.265,95%CI:1.296~1.426,P=0.001;OR=2.532,95%CI:1.126~5.013,P=0.026)。死亡组MODS评分、APACHEⅡ评分明显高于生存组,差异有统计学意义(P<0.05)。结论老年重症脑卒中患者急性期易发生MODS。
基金supported by the National Natural Science Foundation of China(61973175,61973172,62073177)the Key Technologies R&D Program of Tianjin(19JCZDJC32800)Tianjin Research Innovation Project for Postgraduate Students(2020YJSZXB02).
文摘For the typical first-order systems with time-delay,this paper explors the control capability of linear active disturbance rejection control(LADRC).Firstly,the critical time-delay of LADRC is analyzed using the frequency-sweeping method and the Routh criterion,and the stable time-delay interval starting from zero is accurately obtained,which reveals the limitations of general LADRC on large time-delay.Then in view of the large time-delay,an LADRC controller is developed and verified to be effective,along with the robustness analysis.Finally,numerical simulations show the accuracy of critical time-delay,and demonstrate the effectiveness and robustness of the proposed controller compared with other modified LADRCs.
基金supported by the National Natural Science Foundation of China(61973175,61973172)。
文摘In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.
