目的分析老年抑郁症(late life depression,LLD)患者认知功能对自杀观念的影响。方法入组2021年1月至2022年12月在首都医科大学附属北京安定医院门诊和住院的LLD患者共103例,按照近2周有无自杀观念(包括自杀观念和自杀未遂),将其分为无...目的分析老年抑郁症(late life depression,LLD)患者认知功能对自杀观念的影响。方法入组2021年1月至2022年12月在首都医科大学附属北京安定医院门诊和住院的LLD患者共103例,按照近2周有无自杀观念(包括自杀观念和自杀未遂),将其分为无自杀倾向组(n=37例)和自杀倾向组(n=66例)。收集患者的一般人口学资料,采用重复成套神经心理状态测量表(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)评定患者认知功能。采用Logistic回归对各相关因素进行分析。结果自杀倾向组[RBANS总分(137.26±28.78)、即刻记忆(22.39±7.47)、词汇学习(16.02±4.59)]和无自杀倾向组[RBANS总分(150.00±25.53)、即刻记忆(26.41±6.74)、词汇学习(18.43±4.18)]的RBANS总分、即刻记忆、词汇学习差异具有统计学意义(P<0.05);Logistics回归分析结果显示,词汇学习(OR=0.012,P=0.012)、首次发病年龄(OR=1.036,P=0.024)均是LLD患者自杀倾向的危险因素。结论词汇学习能力越差、首次发病年龄越大提示患者自杀风险越高,可能为自杀风险的早期识别指标。展开更多
Landslide susceptibility assessment is an essential tool for disaster prevention and management. In areas with multiple fault zones, the impact of fault zone on slope stability cannot be disregarded. This study perfor...Landslide susceptibility assessment is an essential tool for disaster prevention and management. In areas with multiple fault zones, the impact of fault zone on slope stability cannot be disregarded. This study performed qualitative analysis of fault zones and proposed a zoning method to assess the landslide susceptibility in Chengkou County, Chongqing Municipality, China. The region within a distance of 1 km from the faults was designated as sub-zone A, while the remaining area was labeled as sub-zone B. To accomplish the assessment, a dataset comprising 388 historical landslides and 388 non-landslide points was used to train the random forest model. 10-fold cross-validation was utilized to select the training and testing datasets for the model. The results of the models were analyzed and discussed, with a focus on model performance and prediction uncertainty. By implementing the proposed division strategy based on fault zone, the accuracy, precision, recall, F-score, and AUC of both two sub-zones surpassed those of the whole region. In comparison to the results obtained for the whole region, sub-zone B exhibited an increase in AUC by 6.15%, while sub-zone A demonstrated a corresponding increase of 1.66%. Moreover, the results of 100 random realizations indicated that the division strategy has little effect on the prediction uncertainty. This study introduces a novel approach to enhance the prediction accuracy of the landslide susceptibility mapping model in areas with multiple fault zones.展开更多
Local control parameters such as instantaneous delay and instantaneous amplitude play an essential role in evaluating the performance and maintaining the stability of real-time hybrid simulation(RTHS).However,existing...Local control parameters such as instantaneous delay and instantaneous amplitude play an essential role in evaluating the performance and maintaining the stability of real-time hybrid simulation(RTHS).However,existing methods have limitations in obtaining this local assessment in either the time domain or frequency domain.In this study,the instantaneous frequency is introduced to determine local control parameters for actuator tracking assessment in a real-time hybrid simulation.Instantaneous properties,including amplitude,delay,frequency and phase,are then calculated based on analytic signals translated from actuator tracking signals through the Hilbert transform.Potential issues are discussed and solutions are proposed for calculation of local control parameters.Numerical simulations are first conducted for sinusoidal and chirp signals with time varying amplitude error and delay to demonstrate the potential of the proposed method.Laboratory tests also are conducted for a predefined random signal as well as the RTHS of a single degree of freedom structure with a self-centering viscous damper to experimentally verify the effectiveness of the proposed use of the instantaneous frequency.Results from the ensuing analysis clearly demonstrate that the instantaneous frequency provides great potential for local control assessment,and the proposed method enables local tracking parameters with good accuracy.展开更多
文摘目的分析老年抑郁症(late life depression,LLD)患者认知功能对自杀观念的影响。方法入组2021年1月至2022年12月在首都医科大学附属北京安定医院门诊和住院的LLD患者共103例,按照近2周有无自杀观念(包括自杀观念和自杀未遂),将其分为无自杀倾向组(n=37例)和自杀倾向组(n=66例)。收集患者的一般人口学资料,采用重复成套神经心理状态测量表(Repeatable Battery for the Assessment of Neuropsychological Status,RBANS)评定患者认知功能。采用Logistic回归对各相关因素进行分析。结果自杀倾向组[RBANS总分(137.26±28.78)、即刻记忆(22.39±7.47)、词汇学习(16.02±4.59)]和无自杀倾向组[RBANS总分(150.00±25.53)、即刻记忆(26.41±6.74)、词汇学习(18.43±4.18)]的RBANS总分、即刻记忆、词汇学习差异具有统计学意义(P<0.05);Logistics回归分析结果显示,词汇学习(OR=0.012,P=0.012)、首次发病年龄(OR=1.036,P=0.024)均是LLD患者自杀倾向的危险因素。结论词汇学习能力越差、首次发病年龄越大提示患者自杀风险越高,可能为自杀风险的早期识别指标。
基金Postdoctoral Research Foundation of China (2021M700608)Natural Science Foundation Project of Chongqing, Chongqing Science and Technology Commission (cstc2021jcyj-bsh0047)+1 种基金Scientific Project Supported by the Bureau of Planning and Natural Resources, Chongqing (2301DH09002)Sichuan Transportation Science and Technology Project (2018ZL-01)。
文摘Landslide susceptibility assessment is an essential tool for disaster prevention and management. In areas with multiple fault zones, the impact of fault zone on slope stability cannot be disregarded. This study performed qualitative analysis of fault zones and proposed a zoning method to assess the landslide susceptibility in Chengkou County, Chongqing Municipality, China. The region within a distance of 1 km from the faults was designated as sub-zone A, while the remaining area was labeled as sub-zone B. To accomplish the assessment, a dataset comprising 388 historical landslides and 388 non-landslide points was used to train the random forest model. 10-fold cross-validation was utilized to select the training and testing datasets for the model. The results of the models were analyzed and discussed, with a focus on model performance and prediction uncertainty. By implementing the proposed division strategy based on fault zone, the accuracy, precision, recall, F-score, and AUC of both two sub-zones surpassed those of the whole region. In comparison to the results obtained for the whole region, sub-zone B exhibited an increase in AUC by 6.15%, while sub-zone A demonstrated a corresponding increase of 1.66%. Moreover, the results of 100 random realizations indicated that the division strategy has little effect on the prediction uncertainty. This study introduces a novel approach to enhance the prediction accuracy of the landslide susceptibility mapping model in areas with multiple fault zones.
基金National Natural Science Foundation of China under Grant No.52178114Jiangsu Association for Science and Technology Youth Science and Technology Talent Support Project No.2021-79。
文摘Local control parameters such as instantaneous delay and instantaneous amplitude play an essential role in evaluating the performance and maintaining the stability of real-time hybrid simulation(RTHS).However,existing methods have limitations in obtaining this local assessment in either the time domain or frequency domain.In this study,the instantaneous frequency is introduced to determine local control parameters for actuator tracking assessment in a real-time hybrid simulation.Instantaneous properties,including amplitude,delay,frequency and phase,are then calculated based on analytic signals translated from actuator tracking signals through the Hilbert transform.Potential issues are discussed and solutions are proposed for calculation of local control parameters.Numerical simulations are first conducted for sinusoidal and chirp signals with time varying amplitude error and delay to demonstrate the potential of the proposed method.Laboratory tests also are conducted for a predefined random signal as well as the RTHS of a single degree of freedom structure with a self-centering viscous damper to experimentally verify the effectiveness of the proposed use of the instantaneous frequency.Results from the ensuing analysis clearly demonstrate that the instantaneous frequency provides great potential for local control assessment,and the proposed method enables local tracking parameters with good accuracy.
