The modal method is applied to analyze coupled vibration of belt drive systems. A belt drive system is a hybrid system consisting of continuous belts modeled as strings as well as discrete pulleys and a tensioner arm....The modal method is applied to analyze coupled vibration of belt drive systems. A belt drive system is a hybrid system consisting of continuous belts modeled as strings as well as discrete pulleys and a tensioner arm. The characteristic equation of the system is derived from the governing equation. Numerical results demenstrate the effects of the transport speed and the initial tension on natural frequencies.展开更多
The problem of linear time-varying（LTV） system modal analysis is considered based on time-dependent state space representations, as classical modal analysis of linear time-invariant systems and current LTV system mo...The problem of linear time-varying（LTV） system modal analysis is considered based on time-dependent state space representations, as classical modal analysis of linear time-invariant systems and current LTV system modal analysis under the ＂frozen-time＂ assumption are not able to determine the dynamic stability of LTV systems. Time-dependent state space representations of LTV systems are first introduced, and the corresponding modal analysis theories are subsequently presented via a stabilitypreserving state transformation. The time-varying modes of LTV systems are extended in terms of uniqueness, and are further interpreted to determine the system＇s stability. An extended modal identification is proposed to estimate the time-varying modes, consisting of the estimation of the state transition matrix via a subspace-based method and the extraction of the time-varying modes by the QR decomposition. The proposed approach is numerically validated by three numerical cases, and is experimentally validated by a coupled moving-mass simply supported beam exper- imental case. The proposed approach is capable of accurately estimating the time-varying modes, and provides anew way to determine the dynamic stability of LTV systems by using the estimated time-varying modes.展开更多
In telerobotic system for remote welding, human-machine interface is one of the most important factor for enhancing capability and efficiency. This paper presents an architecture design of human-machine interface for ...In telerobotic system for remote welding, human-machine interface is one of the most important factor for enhancing capability and efficiency. This paper presents an architecture design of human-machine interface for welding telerobotic system： welding multi-modal human-machine interface. The human-machine interface integrated several control modes, which are namely shared control, teleteaching, supervisory control and local autonomous control. Space mouse, panoramic vision camera and graphics simulation system are also integrated into the human-machine interface for welding teleoperation. Finally, weld seam tracing and welding experiments of U-shape seam are performed by these control modes respectively. The results show that the system has better performance of human-machine interaction and complexity environment welding.展开更多
Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal ...Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal system,with the aim of exploring its interpersonal meanings.Results show that:first,the declarative mood and interrogative mood used in the police caution protect the legitimate rights of the interrogated;second,the widely use of Low value modal verbs demonstrates a more humane and democratic legislation principle;and third,the absence of Affect resources and the frequent application of Capacity resources narrow the interpersonal distance between policeman and the interrogated,reflecting the transformation in policeman’s interrogation practices.展开更多
针对现有多模态推荐系统忽略从用户行为中学习解纠缠潜在因素表示的问题,本文提出一种新算法模型MADVAE(Disentangled Variational AutoEncoder with Multi-layer and Attention)。首先,利用先进的多模态预训练技术将多模态信息投影到...针对现有多模态推荐系统忽略从用户行为中学习解纠缠潜在因素表示的问题,本文提出一种新算法模型MADVAE(Disentangled Variational AutoEncoder with Multi-layer and Attention)。首先,利用先进的多模态预训练技术将多模态信息投影到统一的文本内容空间。然后构建了一个冻结的项目-项目图,通过改进的残差图卷积网络将文本内容和交互编码为两组解纠缠表示。其次,通过引入多线性层和归一化层模块来更好地捕捉输入数据中的复杂关系,同时采用多头注意力机制增强对长距离依赖关系的捕捉能力。最后将用户和项目之间交互派生的表示与从文本内容中学习到的表示对齐。在三个真实的数据集上与其他基线算法进行了对比实验,实验结果表明本文算法较其他基线算法有明显提升。展开更多
Modality is used to express subjective judgment as well as the speaker’s opinions and attitudes.This paper aims to analyze the reporters’orientation reflected by linguistic modal expressions in English news reports ...Modality is used to express subjective judgment as well as the speaker’s opinions and attitudes.This paper aims to analyze the reporters’orientation reflected by linguistic modal expressions in English news reports from the perspective of Systemic-Functional Grammar,especially from the perspective of type,value,orientation and polarity.展开更多
文章基于地铁集团实际业务场景,设计了基于多模式出行的城际客票一体化系统。以MaaS(Mobility as a Service)理念为核心,构建软硬件协同架构,通过数据采集与传输、路径融合计算、用户界面交互及智能推荐算法实现路径动态优化机制,并以...文章基于地铁集团实际业务场景,设计了基于多模式出行的城际客票一体化系统。以MaaS(Mobility as a Service)理念为核心,构建软硬件协同架构,通过数据采集与传输、路径融合计算、用户界面交互及智能推荐算法实现路径动态优化机制,并以典型城际走廊为实验场景进行了模拟验证。实验结果表明,系统在响应速度、推荐准确性与用户满意度等方面均表现优越,具备良好的工程落地能力。展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.10672092 and 10725209)Scientific Research Project of Shanghai Municipal Education Commission(No.07ZZ07)Shanghai Leading Academic Discipline Project(No.Y0103)
文摘The modal method is applied to analyze coupled vibration of belt drive systems. A belt drive system is a hybrid system consisting of continuous belts modeled as strings as well as discrete pulleys and a tensioner arm. The characteristic equation of the system is derived from the governing equation. Numerical results demenstrate the effects of the transport speed and the initial tension on natural frequencies.
基金Supported by the China Scholarship Council,National Natural Science Foundation of China(Grant No.11402022)the Interuniversity Attraction Poles Programme of the Belgian Science Policy Office(DYSCO)+1 种基金the Fund for Scientific Research–Flanders(FWO)the Research Fund KU Leuven
文摘The problem of linear time-varying（LTV） system modal analysis is considered based on time-dependent state space representations, as classical modal analysis of linear time-invariant systems and current LTV system modal analysis under the ＂frozen-time＂ assumption are not able to determine the dynamic stability of LTV systems. Time-dependent state space representations of LTV systems are first introduced, and the corresponding modal analysis theories are subsequently presented via a stabilitypreserving state transformation. The time-varying modes of LTV systems are extended in terms of uniqueness, and are further interpreted to determine the system＇s stability. An extended modal identification is proposed to estimate the time-varying modes, consisting of the estimation of the state transition matrix via a subspace-based method and the extraction of the time-varying modes by the QR decomposition. The proposed approach is numerically validated by three numerical cases, and is experimentally validated by a coupled moving-mass simply supported beam exper- imental case. The proposed approach is capable of accurately estimating the time-varying modes, and provides anew way to determine the dynamic stability of LTV systems by using the estimated time-varying modes.
文摘In telerobotic system for remote welding, human-machine interface is one of the most important factor for enhancing capability and efficiency. This paper presents an architecture design of human-machine interface for welding telerobotic system： welding multi-modal human-machine interface. The human-machine interface integrated several control modes, which are namely shared control, teleteaching, supervisory control and local autonomous control. Space mouse, panoramic vision camera and graphics simulation system are also integrated into the human-machine interface for welding teleoperation. Finally, weld seam tracing and welding experiments of U-shape seam are performed by these control modes respectively. The results show that the system has better performance of human-machine interaction and complexity environment welding.
文摘Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal system,with the aim of exploring its interpersonal meanings.Results show that:first,the declarative mood and interrogative mood used in the police caution protect the legitimate rights of the interrogated;second,the widely use of Low value modal verbs demonstrates a more humane and democratic legislation principle;and third,the absence of Affect resources and the frequent application of Capacity resources narrow the interpersonal distance between policeman and the interrogated,reflecting the transformation in policeman’s interrogation practices.
文摘针对现有多模态推荐系统忽略从用户行为中学习解纠缠潜在因素表示的问题,本文提出一种新算法模型MADVAE(Disentangled Variational AutoEncoder with Multi-layer and Attention)。首先,利用先进的多模态预训练技术将多模态信息投影到统一的文本内容空间。然后构建了一个冻结的项目-项目图,通过改进的残差图卷积网络将文本内容和交互编码为两组解纠缠表示。其次,通过引入多线性层和归一化层模块来更好地捕捉输入数据中的复杂关系,同时采用多头注意力机制增强对长距离依赖关系的捕捉能力。最后将用户和项目之间交互派生的表示与从文本内容中学习到的表示对齐。在三个真实的数据集上与其他基线算法进行了对比实验,实验结果表明本文算法较其他基线算法有明显提升。
文摘Modality is used to express subjective judgment as well as the speaker’s opinions and attitudes.This paper aims to analyze the reporters’orientation reflected by linguistic modal expressions in English news reports from the perspective of Systemic-Functional Grammar,especially from the perspective of type,value,orientation and polarity.
文摘文章基于地铁集团实际业务场景,设计了基于多模式出行的城际客票一体化系统。以MaaS(Mobility as a Service)理念为核心,构建软硬件协同架构,通过数据采集与传输、路径融合计算、用户界面交互及智能推荐算法实现路径动态优化机制,并以典型城际走廊为实验场景进行了模拟验证。实验结果表明,系统在响应速度、推荐准确性与用户满意度等方面均表现优越,具备良好的工程落地能力。
