In this paper, a class of discontinuous neutral-type neural networks (NTNNs) with proportional delays is considered. The targets of the paper are to study the problem of periodic solutions and fixed-time (FXT) stabili...In this paper, a class of discontinuous neutral-type neural networks (NTNNs) with proportional delays is considered. The targets of the paper are to study the problem of periodic solutions and fixed-time (FXT) stabilization of the addressed neural networks. In order to complete the targets, based on set-valued map, differential inclusions theory, coincidence theorem and Hölder inequality technique, some new proportional delay-dependent criteria shown by the inequalities are derived. Based on the fact of the existence of solution, further by applying the FXT stability lemmas and equivalent transformation, the zero solution of closed-loop system achieves FXT stabilization and the corresponding settling-times are estimated. Some previous related works on NTNNs are extended. Finally, one typical example is provided to show the effectiveness of the established results.展开更多
To understand the spatio-temporal variability of precipitation(P)in the Third Pole region(centered on the Tibetan Plateau-TP),it is necessary to quantify the interannual periodicity of P and its relationship with larg...To understand the spatio-temporal variability of precipitation(P)in the Third Pole region(centered on the Tibetan Plateau-TP),it is necessary to quantify the interannual periodicity of P and its relationship with large-scale circulations.In this study,Morlet wavelet transform was used to detect significant(p<0.05)periodic characteristics in P data from meteorological stations in four climate domains in the Third Pole,and to reveal the major large-scale circulations that triggered the variability of periodic P,in addition to bringing large amounts of water vapour.The wavelet transform results were as follows.(1)Significant quasiperiodicity varied from 2 to 11 years.The high-frequency variability mode(2 to 6 years quasi-periods)was universal,and the low-frequency variability mode(7 to 11 years quasi-periods)was rare,occurring mainly in the westerlies and Indian monsoon domains.(2)The majority of periods were base periods(53%),followed by two-base periods.Almost all stations in the Third Pole(95%)showed one or two periods.(3)Periodicity was widely detected in the majority of years(84%).(4)The power spectra of P in the four domains were dominated by statistically significant high-frequency oscillations(ie.,with short periodicity).(5)Large-scale circulations directly and indirectly influenced the periodic P variability in the different domains.The mode of P variability in the different domains was influenced by interactions between large-scale circulation features and not only by the dominant circulation and its control of water vapour transport.The results of this study will contribute to better understanding of the causal mechanisms associated with P variability,which is important for hydrological science and waterresourcemanagement.展开更多
目的:构建A型主动脉夹层患者围手术期数智平台管理方案并评价其应用效果,以期改善患者结局。方法:课题小组根据文献检索及专家咨询结果,形成A型主动脉夹层患者围手术期数智平台管理方案。采用便利抽样法,选取2022年1月至2024年1月于浙...目的:构建A型主动脉夹层患者围手术期数智平台管理方案并评价其应用效果,以期改善患者结局。方法:课题小组根据文献检索及专家咨询结果,形成A型主动脉夹层患者围手术期数智平台管理方案。采用便利抽样法,选取2022年1月至2024年1月于浙江省某三级甲等医院行A型主动脉夹层手术患者为研究对象。干预组(n=56)于2023年2月至2024年1月采用数智平台方案管理,对照组(n=53)于2022年1月—11月采用常规方案管理。比较两组患者术前准备时间、术后机械通气时长及ICU停留时长,比较两组手术中巡回护士外出次数,并采用有效性、满意度、易用性(Usefulness,Satisfaction and Ease of Use,USE)问卷评估平台可用性。结果 :与对照组相比,干预组患者术前准备时间、术后机械通气时长及ICU停留时长均缩短,手术中巡回护士外出次数减少,差异有统计意义(P<0.001),医护人员关于平台使用的USE问卷得分为(6.34±0.29)分。结论:A型主动脉夹层患者围手术期数智平台管理方案有利于缩短该类患者术前准备时间、术后机械通气时长及ICU停留时长,减少手术中巡回护士外出次数,且该平台可用性良好。展开更多
基金supported by Social Science Fund of Hunan province(Grant No.22JD074)the Research Foundation of Education Bureau of Hunan province(Grant No.22B0912).
文摘In this paper, a class of discontinuous neutral-type neural networks (NTNNs) with proportional delays is considered. The targets of the paper are to study the problem of periodic solutions and fixed-time (FXT) stabilization of the addressed neural networks. In order to complete the targets, based on set-valued map, differential inclusions theory, coincidence theorem and Hölder inequality technique, some new proportional delay-dependent criteria shown by the inequalities are derived. Based on the fact of the existence of solution, further by applying the FXT stability lemmas and equivalent transformation, the zero solution of closed-loop system achieves FXT stabilization and the corresponding settling-times are estimated. Some previous related works on NTNNs are extended. Finally, one typical example is provided to show the effectiveness of the established results.
基金National Natural Science Foundation of China,No.42271141,No.42071129National Key Basic Research and Development Project,No.2022YFF1300902。
文摘To understand the spatio-temporal variability of precipitation(P)in the Third Pole region(centered on the Tibetan Plateau-TP),it is necessary to quantify the interannual periodicity of P and its relationship with large-scale circulations.In this study,Morlet wavelet transform was used to detect significant(p<0.05)periodic characteristics in P data from meteorological stations in four climate domains in the Third Pole,and to reveal the major large-scale circulations that triggered the variability of periodic P,in addition to bringing large amounts of water vapour.The wavelet transform results were as follows.(1)Significant quasiperiodicity varied from 2 to 11 years.The high-frequency variability mode(2 to 6 years quasi-periods)was universal,and the low-frequency variability mode(7 to 11 years quasi-periods)was rare,occurring mainly in the westerlies and Indian monsoon domains.(2)The majority of periods were base periods(53%),followed by two-base periods.Almost all stations in the Third Pole(95%)showed one or two periods.(3)Periodicity was widely detected in the majority of years(84%).(4)The power spectra of P in the four domains were dominated by statistically significant high-frequency oscillations(ie.,with short periodicity).(5)Large-scale circulations directly and indirectly influenced the periodic P variability in the different domains.The mode of P variability in the different domains was influenced by interactions between large-scale circulation features and not only by the dominant circulation and its control of water vapour transport.The results of this study will contribute to better understanding of the causal mechanisms associated with P variability,which is important for hydrological science and waterresourcemanagement.
文摘目的:构建A型主动脉夹层患者围手术期数智平台管理方案并评价其应用效果,以期改善患者结局。方法:课题小组根据文献检索及专家咨询结果,形成A型主动脉夹层患者围手术期数智平台管理方案。采用便利抽样法,选取2022年1月至2024年1月于浙江省某三级甲等医院行A型主动脉夹层手术患者为研究对象。干预组(n=56)于2023年2月至2024年1月采用数智平台方案管理,对照组(n=53)于2022年1月—11月采用常规方案管理。比较两组患者术前准备时间、术后机械通气时长及ICU停留时长,比较两组手术中巡回护士外出次数,并采用有效性、满意度、易用性(Usefulness,Satisfaction and Ease of Use,USE)问卷评估平台可用性。结果 :与对照组相比,干预组患者术前准备时间、术后机械通气时长及ICU停留时长均缩短,手术中巡回护士外出次数减少,差异有统计意义(P<0.001),医护人员关于平台使用的USE问卷得分为(6.34±0.29)分。结论:A型主动脉夹层患者围手术期数智平台管理方案有利于缩短该类患者术前准备时间、术后机械通气时长及ICU停留时长,减少手术中巡回护士外出次数,且该平台可用性良好。
