The slope stability assessment is a classical problem in geotechnical engineering.This topic have attracted many researcher’s attention and various theoretical models for predicting critical slope heights or safety f...The slope stability assessment is a classical problem in geotechnical engineering.This topic have attracted many researcher’s attention and various theoretical models for predicting critical slope heights or safety factors in the light of the limit equilibrium(LE)method and the kinematical approach of limit analysis(LA)method.Meanwhile,a large number of experimental studies have been conducted to check the slope stability.Using centrifuge testing results,this paper aims to employ Bayesian method to characterize the model uncertainties of the classical three-dimensional rotational failure mechanism proposed by Michalowski and Drescher(2009)to predict critical slope heights in frictional soils,by incorporating the test uncertainties and parameter uncertainties.The obtained results show that the LA three-dimensional rotational failure mechanism overestimates the critical slope height compared with the LE method,and the experimental observational uncertainty has negligible influences on the posterior statistics of model uncertainty.展开更多
低功耗广域网LoRaWAN(Long Range Wide Area Network)能兼顾低功耗与远通信距离,已经应用于很多领域。分析了LoRaWAN协议中A类节点发送数据的过程,据此建立了包含各个状态转移概率的马尔科夫模型。然后,基于SX1278芯片的相关参数对协议...低功耗广域网LoRaWAN(Long Range Wide Area Network)能兼顾低功耗与远通信距离,已经应用于很多领域。分析了LoRaWAN协议中A类节点发送数据的过程,据此建立了包含各个状态转移概率的马尔科夫模型。然后,基于SX1278芯片的相关参数对协议模型进行了仿真,并分析了LoRaWAN网络中网关回复时机、节点数量、频段数、链路质量等因素对A类节点发送数据的延时和能耗的影响。仿真结果表明,在单网关且总信道数不变的情况下,减少频段数,延后网关确认回复可以缩短节点发送数据的延时,降低节点发送数据的能耗。这对提升LoRaWAN网络性能具有很强的参考性。展开更多
为解决智能交通系统(intelligent transport systems,ITS)的传统建模方法中存在难以解决的复杂问题,如不能对横切关注点进行建模、难以分离软件系统的非功能特性等,研究基于体系结构分析与设计语言(architecture analysis and design la...为解决智能交通系统(intelligent transport systems,ITS)的传统建模方法中存在难以解决的复杂问题,如不能对横切关注点进行建模、难以分离软件系统的非功能特性等,研究基于体系结构分析与设计语言(architecture analysis and design language,AADL)扩展的面向方面的建模方法在ITS上的应用。基于AADL建立路边单元系统模型,生成系统功能代码,进行流分析测试。基于扩展的AADL描述系统非功能特性,生成方面代码。实例结果表明,该方法弥补了传统建模方法的不足。展开更多
Somatosensory evoked potentials(SEPs)have been widely used to assess neurological function in clinical practice.A good understanding of the association between SEP signals and neurological function is helpful for prec...Somatosensory evoked potentials(SEPs)have been widely used to assess neurological function in clinical practice.A good understanding of the association between SEP signals and neurological function is helpful for precise diagnosis of impairment location.Previous studies on SEPs have been reported in animal models.However,few studies have reported the relationships between SEP waveforms in animals and those in humans.In this study,we collected normal SEP waveforms and decomposed them into specific time–frequency components(TFCs).Our results showed three stable TFC distribution regions in intact goats and rats and in humans.After we induced spinal cord injury in the animal models,a greater number of small TFC distribution regions were observed in the injured goat and rat groups than in the normal group.Moreover,there were significant correlations(P<0.05)and linear relationships between the main SEP TFCs of the human group and those of the goat and rat groups.A stable TFC distribution of SEP components was observed in the human,goat and rat groups,and the TFC distribution modes were similar between the three groups.Results in various animal models in this study could be translated to future clinical studies based on SEP TFC analysis.Human studies were approved by the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster(approval No.UM 05-312 T/975)on December 5,2005.Rat experiments were approved by the Committee on the Use of Live Animals in Teaching and Research of Li Ka Shing Faculty of Medicine of the University of Hong Kong(approval No.CULART 2912-12)on January 28,2013.Goat experiments were approved by the Animal Ethics Committee of Affiliated Hospital of Guangdong Medical University(approval No.GDY2002132)on March 5,2018.展开更多
时间敏感网络(Time-sensitive networking,TSN)作为一种新兴工业通信技术,能够为工业控制业务提供高可靠及确定性时延保障.针对时间敏感网络在工业场景中广泛采用的时间感知整形(Time-aware shaper,TAS)机制,提出一种基于网络演算的时...时间敏感网络(Time-sensitive networking,TSN)作为一种新兴工业通信技术,能够为工业控制业务提供高可靠及确定性时延保障.针对时间敏感网络在工业场景中广泛采用的时间感知整形(Time-aware shaper,TAS)机制,提出一种基于网络演算的时延上界分析模型,对多节点组网下端到端时延上界进行定量分析,用以评估门控(Gate control list,GCL)设置是否满足业务服务质量(Quality of service,QoS)需求,有助于简化多节点组网场景下门控设置复杂度.模型仿真部分对影响端到端时延的主要因素进行了对比分析,并通过OMNeT++实时仿真验证了所提出时延上界分析模型的有效性.展开更多
基金supported by the National Natural Science Foundation of China(52108388)the science and technology innovation Program of Hunan Province(Project No.2021RC3015).
文摘The slope stability assessment is a classical problem in geotechnical engineering.This topic have attracted many researcher’s attention and various theoretical models for predicting critical slope heights or safety factors in the light of the limit equilibrium(LE)method and the kinematical approach of limit analysis(LA)method.Meanwhile,a large number of experimental studies have been conducted to check the slope stability.Using centrifuge testing results,this paper aims to employ Bayesian method to characterize the model uncertainties of the classical three-dimensional rotational failure mechanism proposed by Michalowski and Drescher(2009)to predict critical slope heights in frictional soils,by incorporating the test uncertainties and parameter uncertainties.The obtained results show that the LA three-dimensional rotational failure mechanism overestimates the critical slope height compared with the LE method,and the experimental observational uncertainty has negligible influences on the posterior statistics of model uncertainty.
文摘低功耗广域网LoRaWAN(Long Range Wide Area Network)能兼顾低功耗与远通信距离,已经应用于很多领域。分析了LoRaWAN协议中A类节点发送数据的过程,据此建立了包含各个状态转移概率的马尔科夫模型。然后,基于SX1278芯片的相关参数对协议模型进行了仿真,并分析了LoRaWAN网络中网关回复时机、节点数量、频段数、链路质量等因素对A类节点发送数据的延时和能耗的影响。仿真结果表明,在单网关且总信道数不变的情况下,减少频段数,延后网关确认回复可以缩短节点发送数据的延时,降低节点发送数据的能耗。这对提升LoRaWAN网络性能具有很强的参考性。
文摘为解决智能交通系统(intelligent transport systems,ITS)的传统建模方法中存在难以解决的复杂问题,如不能对横切关注点进行建模、难以分离软件系统的非功能特性等,研究基于体系结构分析与设计语言(architecture analysis and design language,AADL)扩展的面向方面的建模方法在ITS上的应用。基于AADL建立路边单元系统模型,生成系统功能代码,进行流分析测试。基于扩展的AADL描述系统非功能特性,生成方面代码。实例结果表明,该方法弥补了传统建模方法的不足。
基金supported by the National Natural Science Foundation of China,No.81871768(to YH)the Natural Science Foundation of Tianjin of China,No.18JCYBJC29600(to HYC)High Level-Hospital Program,Health Commission of Guangdong Province of China,No.HKUSZH201902011(to YH).
文摘Somatosensory evoked potentials(SEPs)have been widely used to assess neurological function in clinical practice.A good understanding of the association between SEP signals and neurological function is helpful for precise diagnosis of impairment location.Previous studies on SEPs have been reported in animal models.However,few studies have reported the relationships between SEP waveforms in animals and those in humans.In this study,we collected normal SEP waveforms and decomposed them into specific time–frequency components(TFCs).Our results showed three stable TFC distribution regions in intact goats and rats and in humans.After we induced spinal cord injury in the animal models,a greater number of small TFC distribution regions were observed in the injured goat and rat groups than in the normal group.Moreover,there were significant correlations(P<0.05)and linear relationships between the main SEP TFCs of the human group and those of the goat and rat groups.A stable TFC distribution of SEP components was observed in the human,goat and rat groups,and the TFC distribution modes were similar between the three groups.Results in various animal models in this study could be translated to future clinical studies based on SEP TFC analysis.Human studies were approved by the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster(approval No.UM 05-312 T/975)on December 5,2005.Rat experiments were approved by the Committee on the Use of Live Animals in Teaching and Research of Li Ka Shing Faculty of Medicine of the University of Hong Kong(approval No.CULART 2912-12)on January 28,2013.Goat experiments were approved by the Animal Ethics Committee of Affiliated Hospital of Guangdong Medical University(approval No.GDY2002132)on March 5,2018.
文摘时间敏感网络(Time-sensitive networking,TSN)作为一种新兴工业通信技术,能够为工业控制业务提供高可靠及确定性时延保障.针对时间敏感网络在工业场景中广泛采用的时间感知整形(Time-aware shaper,TAS)机制,提出一种基于网络演算的时延上界分析模型,对多节点组网下端到端时延上界进行定量分析,用以评估门控(Gate control list,GCL)设置是否满足业务服务质量(Quality of service,QoS)需求,有助于简化多节点组网场景下门控设置复杂度.模型仿真部分对影响端到端时延的主要因素进行了对比分析,并通过OMNeT++实时仿真验证了所提出时延上界分析模型的有效性.
