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应用随机森林与神经网络算法的足底软组织本构参数反演方法

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医用生物力学 2024年第3期39卷 476-481页

作者：李烽韬孙丽芳陶雅萍杨鹏纪猛强桑建兵河北工业大学机械工程学院天津300401 河北工业大学医院内科天津300401

目的基于随机森林(random forest, RF)算法和反向传播(back propagation, BP)神经网络算法实现对足底软组织超弹性模型本构参数的预测,以提升本构参数获取方式的效率和准确性。方法首先建立足底软组织球形压痕实验的有限元模型,并对... 详细信息

目的基于随机森林(random forest, RF)算法和反向传播(back propagation, BP)神经网络算法实现对足底软组织超弹性模型本构参数的预测,以提升本构参数获取方式的效率和准确性。方法首先建立足底软组织球形压痕实验的有限元模型,并对球形压痕实验过程进行仿真,得到具有非线性关系的位移和压痕力的数据集。将数据集进行划分,得到训练集和测试集,分别对搭建好的RF和BP神经网络(BP neural network, BPNN)模型进行训练,通过实验数据对足底软组织本构参数进行预测。最后,引入均方误差(mean square error, MSE)和决定系数(R2)对模型的预测准确性进行评估,同时对比实验曲线验证模型的有效性。结果利用RF和BPNN模型结合有限元仿真是确定足底软组织超弹性本构参数的有效、准确的方法。训练后的RF模型MSE达到1.370 2×10^(-3),R^(2)为0.982 9;BPNN模型MSE达到4.858 1×10^(-5),R^(2)为0.999 3。反求得到适用于仿真的足底软组织的超弹性本构参数,预测得到的两组本构参数的计算响应曲线与实验曲线吻合较好。结论基于人工智能算法模型对足底软组织超弹性本构参数的预测精度很高,相关研究成果也可以应用于足底软组织其他力学特性的研究。同时,研究结果为足底软组织本构参数的获取提供新方法,有助于快速诊断足底软组织病变等临床问题。

关键词：足底软组织参数识别 BP神经网络随机森林

基于神经网络的袋鼠软骨组织材料参数反演及非线性特性分析

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河北工业大学学报 2024年第2期53卷 30-35,63页

作者：马钰桑建兵李洋梁炜光魏新宇河北工业大学机械工程学院天津300401

软骨损伤和退变会导致骨关节炎等疾病的发生,因此深入研究软骨的力学性能并确定其材料参数是生物力学领域重点关注的课题之一。本文首先建立了袋鼠肩关节软骨组织的有限元模型,将软骨组织视为超弹性材料并采用二阶缩减多项式本构模型,... 详细信息

软骨损伤和退变会导致骨关节炎等疾病的发生,因此深入研究软骨的力学性能并确定其材料参数是生物力学领域重点关注的课题之一。本文首先建立了袋鼠肩关节软骨组织的有限元模型,将软骨组织视为超弹性材料并采用二阶缩减多项式本构模型,同时在有限元分析中考虑了应变率对力学行为的影响,对软骨组织的压痕过程进行了有限元仿真,得到其变形特征及应力分布规律。其次,搭建了对软骨组织进行材料参数反演的神经网络智能算法,对其本构参数进行了预测,得到了能够准确描述软骨变形行为的材料参数。研究结果表明:神经网络与有限元相结合是预测软骨超弹性材料参数的一种高效、准确的方法,可以有效评估软骨组织力学性能,为关节软骨类病理研究和修复提供参考和帮助。

关键词：软骨神经网络有限元分析应变率超弹性

Inflation analyses of a circular elastomeric membrane with hydrostatic pressure

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Theoretical & Applied Mechanics Letters 2012年第6期2卷 15-18页

作者： Zhongkai Zhang jianbing sang Yunjiao Zhang School of Mechanical Engineering Hebei University of TechnologyTianjin 300130China School of Mechanical Engineering Tianjin UniversityTianjin 300072China

Composite diaphragm inflation （CDI） experiment is a useful methodology for exploring the mechanics relation of cell-cell junctions within a living epithelial sheet. In this paper, a new methodology of CDI experiment has been put forward. The finite deformation of a circular polydimezhylsiloxane elastomeric membrane, which is used as the substrate for the culture of epithelial cells, under hydrostatic pressure is explored by the theory of non-linear continuum mechanics. The simplified governing equations with minimum amount of differential equations and boundary conditions are obtained and solved by multiple shooting method. The influences on the membrane by hydrostatic pressure have been discussed.

关键词： elastomer membrane hydrostatic pressure cell mechanics

Engineering the future cereal crops with big biological data:toward intelligence-driven breeding by design

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Journal of Genetics and Genomics 2024年第8期51卷 781-789页

作者： Lei Liu Jimin Zhan jianbing Yan National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhanHubei 430070China

How to feed 10 billion human populations is one of the challenges that need to be addressed in the following decades,especially under an unpredicted climate *** breeding,initiating from the phenotype-based selection by local farmers and developing into current biotechnology-based breeding,has played a critical role in securing the global food ***,regarding the changing environment and ever-increasing human population,can we breed outstanding crop varieties fast enough to achieve high productivity,good quality,and widespread adaptability?This review outlines the recent achievements in understanding cereal crop breeding,including the current knowledge about crop agronomic traits,newly developed techniques,crop big biological data research,and the possibility of integrating them for intelligence-driven breeding by design,which ushers in a new era of crop breeding practice and shapes the novel architecture of future *** review focuses on the major cereal crops,including rice,maize,and wheat,to explain how intelligence-driven breeding by design is becoming a reality.

关键词： Crop Big biological data Multi-omic Artificial intelligence Crop design breeding

An angular blinking jamming method based on electronically controlled corner reflectors

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Journal of Systems Engineering and Electronics 2024年第2期35卷 330-338页

作者： GAN Lin WU Zehao WANG Xuesong LI jianbing State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System National University of Defense TechnologyChangsha 410073China

Passive jamming is believed to have very good potential in countermeasure *** this paper,a passive angular blinking jamming method based on electronically controlled corner reflectors is *** amplitude of the incident wave can be modulated by switching the corner reflector between the penetration state and the reflection state,and the ensemble of multiple corner reflectors with towing rope can result in complex angle decoying *** of the decoying effect on corner reflectors’radar cross section and positions are analyzed and *** show that the angle measured by a monopulse radar can be significantly interfered by this method while the automatic tracking is employed.

关键词： monopulse radar angular blinking jamming corner reflector amplitude-comparison angle measurement metasurface

A bounding surface visco-plasticity model considering generalized spacing ratio of soils

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1832-1846页

作者： Xiaosen Kang Hongjian Liao Qiangbing Huang jianbing Peng Department of Geological Engineering Chang’an UniversityXi’an710054China Department of Civil Engineering Xi’an Jiaotong UniversityXi’an710049China

The non-unique critical state of soils with time-dependent behaviors is a significant issue in geotechnical engineering ***,previous bounding surface plasticity models cannot predict accurately the non-unique critical state of soils,because the distance between the compression line and critical state line charged by strain-rate effect is basically *** fill this gap,a generalized spacing ratio of soils is defined in the elasto-viscoplastic framework,and a bounding surface visco-plasticity model is formulated and verified,which can consider the generalized spacing ***,the generalized spacing ratio of soils reflects the distance between the compression line and the critical state line of soils with time-dependent ***,the generalized spacing ratio is introduced into an improved anisotropic bounding surface.A new expression of the visco-plastic multiplier is derived by solving the consistency equation of an anisotropic bounding *** the expression,a strain rate index is proposed to account for the strain-rate effect on visco-plastic strain increment,and a visco-plastic hardening modulus is derived to predict the visco-plastic response of soils in overconsolidation *** model is then verified through constant strain rate tests and creep ***,it can capture the non-unique critical states of soils with time-dependent behaviors due to the generalized spacing ratio and the creep rupture of soils due to the visco-plastic multiplier that considers the stress ratio and visco-plastic strain rate.

关键词： Soil Constitutive model Visco-plastic behavior Strain rate Creep Anisotropic

Multi-Dimensional QoS Evaluation and Optimization of Mobile Edge Computing for IoT:A Survey

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Chinese Journal of Electronics 2024年第4期33卷 859-874页

作者： Jiwei HUANG Fangzheng LIU jianbing ZHANG Beijing Key Laboratory of Petroleum Data Mining China University of Petroleum Department of Computer Science and Technology China University of Petroleum

With the evolvement of the Internet of things(IoT), mobile edge computing(MEC) has emerged as a promising computing paradigm to support IoT data analysis and processing. In MEC for IoT, the differentiated requirements on quality of service(QoS) have been growing rapidly, making QoS a multi-dimensional concept including several attributes, such as performance, dependability, energy efficiency, and economic factors. To guarantee the QoS of IoT applications, theories and techniques of multi-dimensional QoS evaluation and optimization have become important theoretical foundations and supporting technologies for the research and application of MEC for IoT,which have attracted significant attention from both academia and industry. This paper aims to survey the existing studies on multi-dimensional QoS evaluation and optimization of MEC for IoT, and provide insights and guidance for future research in this field. This paper summarizes the multi-dimensional and multi-attribute QoS metrics in Io T scenarios, and then several QoS evaluation methods are presented. For QoS optimization, the main research problems in this field are summarized, and optimization models as well as their corresponding solutions are elaborated. We take notice of the booming of edge intelligence in artificial intelligence-empowered Io T scenarios, and illustrate the new research topics and the state-of-the-art approaches related to QoS evaluation and optimization. We discuss the challenges and future research directions.

关键词： Internet of things Mobile edge computing Quality of service Quality of service evaluation Quality of service optimization PERFORMANCE EVALUATION RESOURCE-ALLOCATION SERVICE MIGRATION DELAY CLOUD DEPENDABILITY MECHANISM INTERNET SYSTEM THINGS

Restraint effect of partition wall on the tunnel floor heave in layered rock mass

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Journal of Mountain Science 2024年第7期21卷 2462-2479页

作者： YANG Yunyun HUANG Da ZHONG Zhu LIU Yang PENG jianbing School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China College of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054China College of Civil Engineering&Architecture China Three Gorges UniversityYichang 443002China.

The presence of horizontal layered rocks in tunnel engineering significantly impacts the stability and strength of the surrounding rock mass,leading to floor heave in the *** study focused on preparing layered specimens of rock-like material with varying thickness to investigate the failure behaviors of tunnel *** results indicate that thin-layered rock mass exhibits weak interlayer bonding,causing rock layers near the surface to buckle and break upwards when subjected to horizontal *** an increase in the layer thickness,a transition in failure mode occurs from upward buckling to shear failure along the plane,leading to a noticeable reduction in floor heave *** primary cause of significant deformation in floor heave is upward buckling *** address this issue,the study proposes the installation of a partition wall in the middle of the floor to mitigate heave deformation of the rock *** results demonstrate that the partition wall has a considerable stabilizing effect on the floor,reducing the zone of buckling failure and minimizing floor heave *** is crucial for the partition wall to be sufficiently high to prevent buckling failure and ensure *** simulation calculations on an engineering example,it is confirmed that implementing a partition wall can effectively reduce floor heave and enhance the stability of tunnel floor.

关键词： Layered rock Floor heave Horizontal compression test Failure behavior Partition wall

Identifying the enhancement mechanism of Al/MoO_(3) reactive multilayered films on the ignition ability of semiconductor bridge using a one-dimensional gas-solid two-phase flow model

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Defence Technology（防务技术） 2024年第3期33卷 168-179页

作者： jianbing Xu Yuxuan Zhou Yun Shen Yueting Wang Yinghua Ye Ruiqi Shen School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Micro-Nano Energetic Devices Key Laboratory of MIIT Nanjing 210094China Institute of Space Propulsion Nanjing University of Science and TechnologyNanjing 210094China

Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics *** the ignition enhancement mechanism of RMFs on semiconductor bridge(SCB)during the ignition process is crucial for the engineering and practical application of advanced initiator and pyrotechnics *** this study,a one-dimensional(1D)gas-solid two-phase flow ignition model was established to study the ignition process of ESCB to charge particles based on the reactivity of Al/MoO_(3) *** order to fully consider the coupled exothermic between the RMFs and the SCB plasma during the ignition process,the heat release of chemical reaction in RMFs was used as an internal heat source in this *** is found that the exothermal reaction in RMFs improved the ignition performance of *** the process of plasma rapid condensation with heat release,the product of RMFs enhanced the heat transfer process between the gas phase and the solid charge particle,which accelerated the expansion of hot plasma,and heated the solid charge particle as well as gas phase region with low *** addition,it made up for pressure loss in the gas *** the plasma dissipation process,the exothermal chemical reaction in RMFs acted as the main heating source to heat the charge particle,making the surface temperature of the charge particle,gas pressure,and gas temperature rise *** result may yield significant advantages in providing a universal ignition model for miniaturized ignition devices.

关键词： Ignition enhancement mechanism 1D gas-solid two-phase flow Al/MoO_(3)reactive multilayered films Semiconductor bridge Miniaturized ignition device