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Seismic pseudo-static stability analysis of bedding jointed rock slope stability under the interaction of the upper dangerous rock mass and lower stepped slope mass based on acceleration assessment
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作者 LI De-jian XIAO Yu +3 位作者 YANG Yan-song YU Peng-cheng ZHANG Ying-bin ZHAO Lian-heng 《Journal of Central South University》 2025年第7期2619-2637,共19页
In the practical slope engineering,the stability of lower sliding mass(region A)with back tensile cracks of the jointed rock slope attracts more attentions,but the upper rock mass(region B)may also be unstable.Therefo... In the practical slope engineering,the stability of lower sliding mass(region A)with back tensile cracks of the jointed rock slope attracts more attentions,but the upper rock mass(region B)may also be unstable.Therefore,in this study,based on the stepped failure mode of bedding jointed rock slopes,considering the influence of the upper rock mass on the lower stepped sliding mass,the improved failure model for analyzing the interaction force(F_(AB))between two regions is constructed,and the safety factors(F_(S))of two regions and whole region are derived.In addition,this paper proposes a method to determine the existence of F_(AB) using their respective acceleration values(a_(A) and a_(B))when regions A and B are unstable.The influences of key parameters on two regions and the whole region are analyzed.The results show that the variation of the F_(AB) and F_(S) of two regions can be obtained accurately based on the improved failure model.The accuracy of the improved failure model is verified by comparative analysis.The research results can explain the interaction mechanism of two regions and the natural phenomenon of slope failure caused by the development of cracks. 展开更多
关键词 bedding jointed rock slope upper dangerous rock mass stepped sliding interaction mechanism stability analysis
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Vibration analysis of fluid- structure interaction in water hammer based on transfer matrix method 被引量:1
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作者 GAO Hui TANG Xuelin 《排灌机械工程学报》 EI CSCD 北大核心 2016年第6期518-524,共7页
In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation... In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process. 展开更多
关键词 water hammer fluid-structure interaction transfer matrix method vibration analysis
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3D finite element analysis on pile-soil interaction of passive pile group 被引量:6
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作者 赵明华 刘敦平 +1 位作者 张玲 蒋冲 《Journal of Central South University of Technology》 EI 2008年第1期75-80,共6页
The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plas... The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plastic complying with the Drucker-Prager yield criterion in the analysis. The large displacement of soil was considered and contact elements were used to evaluate the interaction between pile and soil. The influences of soil depth of layer and number of piles on the lateral pressure of the pile were investigated, and the lateral pressure distributions on the (2×1) pile group and on the (2×2) pile group were compared. The results show that the adjacent surcharge may result in significant lateral movement of the soft soil and considerable pressure on the pile. The pressure acting on the row near the surcharge is higher than that on the other row, due to the "barrier" and arching effects in pile groups. The passive load and its distribution should be taken into account in the design of the passive piles. 展开更多
关键词 pile-soil interaction passive pile group soft soil lateral pressure DEFORMATION 3D finite element analysis
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Risk identification and safety assessment of human-computer interaction in integrated avionics based on STAMP
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作者 ZHAO Changxiao LI Hao +2 位作者 ZHANG Wei DAI Jun DONG Lei 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2024年第3期689-706,共18页
To solve the problem of risk identification and quantitative assessment for human-computer interaction(HCI)in complex avionics systems,an HCI safety analysis framework based on system-theoretical process analysis(STPA... To solve the problem of risk identification and quantitative assessment for human-computer interaction(HCI)in complex avionics systems,an HCI safety analysis framework based on system-theoretical process analysis(STPA)and cognitive reliability and error analysis method(CREAM)is proposed.STPACREAM can identify unsafe control actions and find the causal path during the interaction of avionics systems and pilot with the help of formal verification tools automatically.The common performance conditions(CPC)of avionics systems in the aviation environment is established and a quantitative analysis of human failure is carried out.Taking the head-up display(HUD)system interaction process as an example,a case analysis is carried out,the layered safety control structure and formal model of the HUD interaction process are established.For the interactive behavior“Pilots approaching with HUD”,four unsafe control actions and35 causal scenarios are identified and the impact of common performance conditions at different levels on the pilot decision model are analyzed.The results show that HUD's HCI level gradually improves as the scores of CPC increase,and the quality of crew member cooperation and time sufficiency of the task is the key to its HCI.Through case analysis,it is shown that STPACREAM can quantitatively assess the hazards in HCI and identify the key factors that impact safety. 展开更多
关键词 AVIONICS human-computer interaction(HCI) safety assessment system-theoretic accident model and process human reliability analysis
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基于多头自注意力机制与MLP-Interactor的多模态情感分析
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作者 林宜山 左景 卢树华 《浙江大学学报(工学版)》 北大核心 2025年第8期1653-1661,1679,共10页
针对多模态情感分析中单模态特征质量较差及多模态特征交互不够充分的问题,提出基于多头自注意力机制和MLP-Interactor的多模态情感分析方法.通过基于多头自注意力机制的模态内特征交互模块,实现单模态内的特征交互,提高单模态特征的质... 针对多模态情感分析中单模态特征质量较差及多模态特征交互不够充分的问题,提出基于多头自注意力机制和MLP-Interactor的多模态情感分析方法.通过基于多头自注意力机制的模态内特征交互模块,实现单模态内的特征交互,提高单模态特征的质量.通过MLP-Interactor机制实现多模态特征之间的充分交互,学习不同模态之间的一致性信息.利用提出方法,在CMU-MOSI和CMU-MOSEI 2个公开数据集上进行大量的实验验证与测试.结果表明,提出方法超越了当前诸多的先进方法,可以有效地提升多模态情感分析的准确性. 展开更多
关键词 多模态情感分析 MLP-interactor 多头自注意力机制 特征交互
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Stability analysis method of geogrid reinforced expansive soil slopes and its engineering application 被引量:32
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作者 ZHANG Rui LONG Ming-xu +2 位作者 LAN Tian ZHENG Jian-long GEOFF Chao 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第7期1965-1980,共16页
The traditional stability analysis method of geogrid reinforced slopes does not consider the effect of lateral swelling,so it is not applicable to reinforced expansive soil slopes.This paper reports a new stability an... The traditional stability analysis method of geogrid reinforced slopes does not consider the effect of lateral swelling,so it is not applicable to reinforced expansive soil slopes.This paper reports a new stability analysis method for geogrid reinforced expansive soil slopes.The additional pullout force of the free zone due to the lateral swelling and the anti-pullout safety factor of each geogrid layer were obtained by ensuring the overall stability of the reinforced slope.The optimum design was carried out to treat an expansive soil cut slope in Hubei Province,China,by changing the spacing and length of geogrid reinforcement.Calculation results show that the additional pullout force caused by lateral swelling has a great influence on the anti-pullout stability of geogrids,and the local stability of the reinforced slope will be overestimated if the swelling effect of soil in the free zone is not considered. 展开更多
关键词 expansive soil lateral swelling pressure geogrid-soil interaction stability analysis engineering application
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Fluid structure interaction for circulation valve of hydraulic shock absorber 被引量:6
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作者 陈齐平 舒红宇 +2 位作者 方文强 何联格 杨茂举 《Journal of Central South University》 SCIE EI CAS 2013年第3期648-654,共7页
Based on the working principle and the damping characteristic of hydraulic shock absorber, a fluid structure interaction method was presented, which was used to analyze the microcosmic and high-frequency processing me... Based on the working principle and the damping characteristic of hydraulic shock absorber, a fluid structure interaction method was presented, which was used to analyze the microcosmic and high-frequency processing mechanism of fluid structure interaction between circulation valve and liquid of hydraulic shock absorber. The fluid mesh distortion was controlled by the CEL language, and the fluid struc^tre interaction mathematical model was established. The finite element model was established by ANSYS CFX software and was analyzed by dynamic mesh technique. The local sensitive computational area was meshed by prismatic grid, which could reduce the negative volume problem during the simulation. The circulation valve and liquid of hydraulic shock absorber were simulated and analyzed under the condition of sinusoidal inlet velocity loads. Flow characteristic and dynamics characteristic were obtained. The pressure distribution and the displacement of circulation value were obtained, and the acceleration curve of circulation valve was simulated and analyzed. The conformity of the final simulation results with the experimental datum indicates that this method is accurate and reliable to analyze the dynamics characteristic between circulation valve and liquid of hydraulic shock absorber, which can provide a theoretical foundation for optimizing hydraulic shock absorber in the future. 展开更多
关键词 hydraulic shock absorber circulation valve finite element method fluid structure interaction simulation analysis
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Probabilistic model and analysis of coupled train-ballasted track-subgrade system with uncertain structural parameters 被引量:6
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作者 MAO Jian-feng XIAO Yuan-jie +2 位作者 YU Zhi-wu Erol TUTUMLUER ZHU Zhi-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第7期2238-2256,共19页
Random dynamic responses caused by the uncertainty of structural parameters of the coupled train-ballasted track-subgrade system under train loading can pose safety concerns to the train operation.This paper introduce... Random dynamic responses caused by the uncertainty of structural parameters of the coupled train-ballasted track-subgrade system under train loading can pose safety concerns to the train operation.This paper introduced a computational model for analyzing probabilistic dynamic responses of three-dimensional(3D)coupled train-ballasted track-subgrade system(TBTSS),where the coupling effects of uncertain rail irregularities,stiffness and damping properties of ballast and subgrade layers were simultaneously considered.The number theoretical method(NTM)was employed to design discrete points for the multi-dimensional stochastic parameters.The time-histories of stochastic dynamic vibrations of the TBSS with systematically uncertain structural parameters were calculated accurately and efficiently by employing the probability density evolution method(PDEM).The model-predicted results were consistent with those by the Monte Carlo simulation method.A sensitivity study was performed to assess the relative importance of those uncertain structural parameters,based on which a case study was presented to explore the stochastic probability evolution mechanism of such train-ballasted track-subgrade system. 展开更多
关键词 coupled train-ballast-subgrade system structural parameter uncertainty stochastic dynamic analysis probability density evolution method wheel-rail interaction
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Strain analysis of buried steel pipelines across strike-slip faults 被引量:1
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作者 王滨 李昕 周晶 《Journal of Central South University》 SCIE EI CAS 2011年第5期1654-1661,共8页
Existing analytical methods of buried steel pipelines subjected to active strike-slip faults depended on a number of simplifications.To study the failure mechanism more accurately,a refined strain analytical methodolo... Existing analytical methods of buried steel pipelines subjected to active strike-slip faults depended on a number of simplifications.To study the failure mechanism more accurately,a refined strain analytical methodology was proposed,taking the nonlinear characteristics of soil-pipeline interaction and pipe steel into account.Based on the elastic-beam and beam-on-elastic-foundation theories,the position of pipe potential destruction and the strain and deformation distributions along the pipeline were derived.Compared with existing analytical methods and three-dimensional nonlinear finite element analysis,the maximum axial total strains of pipe from the analytical methodology presented are in good agreement with the finite element results at small and intermediate fault movements and become gradually more conservative at large fault displacements.The position of pipe potential failure and the deformation distribution along the pipeline are fairly consistent with the finite element results. 展开更多
关键词 strike-slip fault buffed pipeline nonlinear pipe-soil interaction analytical formula strain analysis
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Numerical analysis of pile lateral behavior of pile supported embankment
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作者 荆志东 刘力 +1 位作者 郑刚 姜岩 《Journal of Central South University》 SCIE EI CAS 2008年第S2期87-92,共6页
A finite difference numerical method was adopted to evaluate the pile lateral behavior of pile supported embankment. A published case history was used to verify the proposed methodology. By simulating the case history... A finite difference numerical method was adopted to evaluate the pile lateral behavior of pile supported embankment. A published case history was used to verify the proposed methodology. By simulating the case history, the determination of parameters needed were verified. Then three embankments constructed on different ground conditions with different soil-pile relative stiffnesses were analyzed to study pile lateral behaviors including pile deflection and bending moment. The results show that pile deflections and bending moments induced by soil lateral deformation and embankment vertical load are different for piles at different positions under the same embankment. The relative stiffness between pile and soil affected by the properties of different reinforcing piles such as concrete pile and deep mixing method pile exert important effects on the pile lateral behavior and the pile's failure modes. Consequently, it is necessary to consider the different piles lateral behaviors and possible failure modes at different positions and the different piles proprieties with different reinforcing methods in the embankment stability analysis. 展开更多
关键词 PILE SUPPORTED EMBANKMENT stability analysis LATERAL soil deformation soil-pile interaction three-dimensional analysis
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3D Seismic Technology Applications to the Analysis of Sedimentary Basins
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作者 Xiangquan Li,Tao Jiang Faculty of Marine Science and Engineering,Resource Institute,China University of Geosciences(Wuhan),Wuhan 430074,China. 《地学前缘》 EI CAS CSCD 北大核心 2009年第S1期202-202,共1页
The recent advances of 3D seismic technique applied in geological study of sedimentary basin analysis were reviewed.The achievements in the study of the sedimentology,structural analysis, fluid-rock interaction and ig... The recent advances of 3D seismic technique applied in geological study of sedimentary basin analysis were reviewed.The achievements in the study of the sedimentology,structural analysis, fluid-rock interaction and igneous geology were summarized.Because 3D seismic resolution and interpretation technology are enhanced surprisingly。 展开更多
关键词 3D SEISMIC technology BASIN analysis fluid-rock interactions SEISMIC STRATIGRAPHY structural analysis IGNEOUS GEOLOGY
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Assessment criteria for nonverbal interaction contents in r-learning
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作者 CHOI Jong-hong LEE Jong-yun YOON Heung-seob 《Journal of Central South University》 SCIE EI CAS 2013年第9期2388-2398,共11页
r-learning,which is based on e-learning and u-learning,is defined as a learning support system that intelligent robots serve verbal and nonverbal interactions on ubiquitous computing environment.In order to guarantee ... r-learning,which is based on e-learning and u-learning,is defined as a learning support system that intelligent robots serve verbal and nonverbal interactions on ubiquitous computing environment.In order to guarantee the advantages of r-learning contents with no limits of timc and place and with nonverbal interaction which are not in e-learning contents,in recent years,assessment criteria for r-learning contents are urgently rcquired.Therefore,the reliable and valid assessment criteria were developed for nonverbal interaction contents in r-learning,and its detailed research content is as follows.First,assessment criteria for nonverbal interaction in r-learning contents will be specified into gesture,facial expression,semi-verbal message,distance,physical contact and time.Second,the validity of the developed assessment criteria will be proved by statistics.Consequently,the assessment criteria for nonverbal interaction contents will be helpful when choosing the better r-learning content and producing the better r-learning content,and the reliability of school education is improved ultimately. 展开更多
关键词 r-learning r-learning contents assessment criteria nonverbal interaction contents confirmatory factor analysis construct validity
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认知工作分析在智能交互设计教学中的应用 被引量:1
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作者 王建民 许忆芊 +3 位作者 付倩文 杨洁琪 王萍 由芳 《实验室研究与探索》 北大核心 2025年第1期171-176,218,共7页
复杂系统人机交互是汽车人机交互设计教学中的重要一环。依托用户体验实验室多年智能汽车交互研究背景及设备环境条件,在传统的设计教学模式基础上,以智能座舱交互设计为主题,将认知工作分析方法引入研究生课程。课程中,学生自主选择设... 复杂系统人机交互是汽车人机交互设计教学中的重要一环。依托用户体验实验室多年智能汽车交互研究背景及设备环境条件,在传统的设计教学模式基础上,以智能座舱交互设计为主题,将认知工作分析方法引入研究生课程。课程中,学生自主选择设计载体及交互对象,以城市空中交通(UAM)智能座舱交互设计为例,学生将实地调研、桌面调研、用户调研与认知工作分析方法相结合,推导界面功能架构图,落实到界面原型设计。此外,在实验室的支持下,基于高保真原型,进行UAM智能座舱HMI可用性测试,证明了设计方案的初步可用性与易用性,并进行设计迭代。学生通过课程实践掌握复杂系统交互设计中的分析方法和工具,为后续自主开展相关研究奠定基础。 展开更多
关键词 认知工作分析 智能座舱 复杂系统人机交互
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语言发育迟缓婴幼儿亲子互动质性研究及其在家庭干预中的应用 被引量:1
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作者 马思维 赖莎 +2 位作者 阿春芳 刘雨涵 杨彬婷 《听力学及言语疾病杂志》 北大核心 2025年第2期119-123,共5页
目的总结普通话情境下语言发育迟缓婴幼儿亲子互动中不利于语言发育的具体行为表现,为制定家长参与的、促进语言发育的早期干预方案提供依据。方法采取质性研究设计,使用互动分析法、类属分析法,归纳30例语言发育迟缓婴幼儿亲子互动视... 目的总结普通话情境下语言发育迟缓婴幼儿亲子互动中不利于语言发育的具体行为表现,为制定家长参与的、促进语言发育的早期干预方案提供依据。方法采取质性研究设计,使用互动分析法、类属分析法,归纳30例语言发育迟缓婴幼儿亲子互动视频中不利于语言发育的共性行为。使用质性研究结果效度检验方法,对108例语言发育迟缓婴幼儿亲子视频中家长的低质量互动行为给予5次建设性反馈指导,统计类属行为变化验证质性研究的效度。结果语言发育迟缓婴幼儿亲子互动中存在不利于语言发育的10个行为问题可分为2大类属3个方面,分别为:家长互动技能问题5个,亲子间相互影响问题3个,互动环境问题2个。经5次治疗师反馈指导后,108组语言发育迟缓亲子互动存在的不利行为明显改善,其中8个问题达到80%稳定标准,实现了质性研究结果的效度验证。结论本文质性研究总结出了不利于语言发育的亲子互动行为问题;基于亲子互动视频的行为分析及反馈,可提升家长的亲子互动技能,为婴幼儿创造良好的语言发育互动环境。 展开更多
关键词 语言发育迟缓 亲子互动 质性研究 家庭干预 视频反馈
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硫醇吸附挥发性有机气体(VOCs)的气敏机理 被引量:1
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作者 张海燕 李琦 +2 位作者 王梓臻 文豪 刘丹凤 《原子与分子物理学报》 CAS 北大核心 2025年第3期35-44,共10页
化学电阻气体传感器对于空气质量、食品检测和人体呼吸有着重要作用.传感器上修饰物硫醇与待测的VOCs之间吸附的气敏机理分析是选择硫醇、预测吸附能力与特异性的重要手段.本文选取了11-巯基-1-十一醇(MUD)和4-甲氧基苄硫醇(MTT)两种常... 化学电阻气体传感器对于空气质量、食品检测和人体呼吸有着重要作用.传感器上修饰物硫醇与待测的VOCs之间吸附的气敏机理分析是选择硫醇、预测吸附能力与特异性的重要手段.本文选取了11-巯基-1-十一醇(MUD)和4-甲氧基苄硫醇(MTT)两种常见的硫醇与六种典型的VOCs(乙醇ETN、异丙醇IPA、丙酮ACN、正己烷HXN、甲苯TLN、苯甲醛BND),基于密度泛函理论(DFT),计算其表面静电势(ESP)并建立气体吸附模型.在气体吸附模型的基础上计算其吸附能,并分析其弱相互作用,从微观角度解释气体吸附的作用机理.实验结果表明,具有羟基的MUD分子对同样有羟基的气体(如ETN、IPA)能够以氢键的方式吸附,具有较强的选择效果;具有苯环的MTT分子与具有苯环结构的气体分子(如TLN、BND)吸附时会在苯环之间形成π-π堆积,基于色散作用进行吸附,这表明MTT分子对具有苯环结构的气体有着较强的吸附作用.研究发现其色散作用吸附的强弱与分子的表面ESP绝对值有关.本文对于传感器表面修饰物吸附气体的气敏机理进行了探究,并对表面修饰物的选择和实验结果预测提供了理论指导. 展开更多
关键词 硫醇 VOCS DFT 表面静电势 气体吸附模型 弱相互作用分析
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面向机器理解的可视化交互信息重构方法
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作者 李昕 刘雯 +1 位作者 廖集秀 杨宗驰 《计算机应用》 北大核心 2025年第6期1748-1755,共8页
可视化重构技术旨在将图形转换为机器能够解析和操作的数据形式,为可视化的大规模分析、重用及检索等提供必备的基础信息;然而,现有的重构方法明显侧重于视觉信息的恢复,忽视了交互信息在数据分析和理解中发挥的关键作用。针对上述问题... 可视化重构技术旨在将图形转换为机器能够解析和操作的数据形式,为可视化的大规模分析、重用及检索等提供必备的基础信息;然而,现有的重构方法明显侧重于视觉信息的恢复,忽视了交互信息在数据分析和理解中发挥的关键作用。针对上述问题,提出一种面向机器理解的可视化交互信息重构方法。首先,形式化定义交互,将可视元素划分为不同的视觉组,采用自动化工具提取可视化图形的交互信息;其次,解耦交互与可视元素的关联,将交互分离为独立的实验变量,构建交互实体库;再次,制定规范的声明式语言,实现交互信息的查询;最后,设计迁移规则,基于可视元素匹配与自适应调整机制实现交互在不同可视化间的迁移适配。实验案例针对可视化问答、查询和迁移等面向机器理解的下游任务,结果显示增加交互信息能够使机器理解可视化交互的语义,从而拓展上述任务的应用范围。以上实验结果验证了所提方法能够使重构后的可视化图形通过融合动态交互信息而达成结构完整性。 展开更多
关键词 机器理解 交互 交互信息重构 可视化重构 数据分析
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潍坊市城乡居民心理健康素养水平现况调查及影响因素分析
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作者 张功法 林艳 +2 位作者 赵兵强 高伟博 俄立梅 《中国健康教育》 北大核心 2025年第1期89-94,共6页
目的了解潍坊市城乡居民心理健康素养水平并了解其影响因素。方法采用多阶段分层随机抽样的方法,采用居民心理健康素养问卷对潍坊市18岁及以上的6730名常住居民开展调查,采用t检验和χ2检验进行城乡居民间心理健康素养水平的比较,采用Lo... 目的了解潍坊市城乡居民心理健康素养水平并了解其影响因素。方法采用多阶段分层随机抽样的方法,采用居民心理健康素养问卷对潍坊市18岁及以上的6730名常住居民开展调查,采用t检验和χ2检验进行城乡居民间心理健康素养水平的比较,采用Logistic回归分析潍坊市居民心理健康素养水平的影响因素,使用优势分析对影响因素的影响程度进行排序,使用交互作用分析探讨各影响因素之间的相互作用。结果潍坊市居民心理健康素养达标率18.86%。Logistic回归分析结果表明生活在城市(95%CI:0.68~0.95)、文化程度高(95%CI:0.07~0.51)、家庭月总收入在1500~7999元(95%CI:0.45~0.80)和有慢性病(95%CI:0.67~0.93)是心理健康素养的保护因素,年龄在60岁以上(95%CI:1.21~3.29)为危险因素。交互作用分析显示,地区与年龄之间的交互项RR为0.82;地区与文化程度之间的交互项RR为1.24(P均<0.05)。结论潍坊市居民心理健康素养达标率较高,城市居民较农村居民心理健康素养水平和达标率更高,心理健康素养水平影响因素之间的相对重要程度从大到小依次为文化程度、工作、年龄、家庭月总收入、慢性病、地区,且地区与年龄之间可能存在拮抗作用,地区与文化程度之间可能存在协同作用。 展开更多
关键词 心理健康素养 现况调查 影响因素 优势分析 交互作用
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上市公司“答非所问”的测度、特征与后果--基于违规行为的探索
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作者 傅毅 胡清秀 +1 位作者 郭照蕊 袁嘉浩 《中央财经大学学报》 北大核心 2025年第5期100-116,共17页
本文通过挖掘“e互动”平台和“互动易”平台文本信息数据构建了“答非所问”程度指数,并实证研究了其与企业违规之间可能存在的关联。结果表明,上市公司的“答非所问”程度与违规行为呈显著正相关关系,即“答非所问”程度越高,上市公... 本文通过挖掘“e互动”平台和“互动易”平台文本信息数据构建了“答非所问”程度指数,并实证研究了其与企业违规之间可能存在的关联。结果表明,上市公司的“答非所问”程度与违规行为呈显著正相关关系,即“答非所问”程度越高,上市公司发生违规的可能性越大。进一步的研究发现,制度环境、行业竞争和产权性质的差异对上述关系产生重要的调节作用,信息透明度的降低是上市公司“答非所问”影响违规行为的一个重要的作用机制。本文利用文本分析方法探究了上市公司“答非所问”程度对违规行为的预警识别作用,为监管部门加强对网络互动平台等新兴网络社交媒体的管理提供了参考与借鉴。 展开更多
关键词 网络平台互动 答非所问 企业违规 文本分析
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核电厂立式圆柱储罐动态特性分析方法研究
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作者 沈睿 陈孟 +1 位作者 陶宏新 黄庆 《核科学与工程》 北大核心 2025年第1期75-82,共8页
基于HOUSNER理论和流固耦合相互作用理论对大型立式圆柱储罐的动态特性展开研究。采用ANSYS有限元软件Fluid80单元建立流固耦合有限元模型,并采用Reduced法进行模态分析,对典型低矮型和细高型锚固储罐在1/4、1/2、3/4和设计装液量H下的... 基于HOUSNER理论和流固耦合相互作用理论对大型立式圆柱储罐的动态特性展开研究。采用ANSYS有限元软件Fluid80单元建立流固耦合有限元模型,并采用Reduced法进行模态分析,对典型低矮型和细高型锚固储罐在1/4、1/2、3/4和设计装液量H下的动态特性进行研究,并对两种模型得出的液面第一阶晃动频率和储罐系统第一阶主振形频率进行对比分析。通过对比基于HOUSNER理论的模型和流固耦合模型的计算结果,对HOUSNER理论公式进行修正,计算结果表明,本文提出的基于HOUSNER理论的修正模型与流固耦合模型计算结果更加接近,本文提出的HOUSENER理论修正模型所预测的储罐第一阶主振形频率最大误差比HOUSENER理论模型降低7.41%,改进了HOUSNER理论公式的不保守性,为核电厂大型储罐的抗震设计提供参考。 展开更多
关键词 立式圆柱储罐 模态分析 流固耦合 动态特性 核电厂
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基于联合交互注意力的图文情感分析方法
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作者 胡慧君 丁子毅 +1 位作者 张耀峰 刘茂福 《北京航空航天大学学报》 北大核心 2025年第7期2262-2270,共9页
社交媒体中的图文情感对于引导舆论走向具有重要意义,越来越受到自然语言处理(NLP)领域的广泛关注。当前,社交媒体图文情感分析的研究对象主要为单幅图像文本对,针对无时序性及多样性的图集文本对的研究相对较少,为有效挖掘图集中图像... 社交媒体中的图文情感对于引导舆论走向具有重要意义,越来越受到自然语言处理(NLP)领域的广泛关注。当前,社交媒体图文情感分析的研究对象主要为单幅图像文本对,针对无时序性及多样性的图集文本对的研究相对较少,为有效挖掘图集中图像与文本之间情感一致性信息,提出基于联合交互注意力的图文情感分析(SA-JIA)方法。该方法使用RoBERTa和双向门控循环单元(Bi-GRU)来提取文本表达特征,使用ResNet50获取图像视觉特征,利用联合注意力来找到图文情感信息表达一致的显著区域,获得新的文本和图像视觉特征,采用交互注意力关注模态间的特征交互,并进行多模态特征融合,进而完成情感分类任务。在IsTS-CN数据集和CCIR20-YQ数据集上进行了实验验证,结果表明:所提方法能够提升社交媒体图文情感分析的性能。 展开更多
关键词 社交媒体 图文情感分析 联合注意力 交互注意力 多模态融合
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