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    A research survey of driver drowsiness driving detection
    YANG Jucheng, WEI Feng, LIN Liang, JIA Qingxiang, LIU Jianzheng
    Journal of Shandong University(Engineering Science)    2024, 54 (2): 1-12.   DOI: 10.6040/j.issn.1672-3961.0.2023.279
    Abstract569)      PDF(pc) (1359KB)(655)       Save
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    An efficient and lightweight RGB frame-level face anti-spoofing model
    Jiachun LI,Bowen LI,Jianbo CHANG
    Journal of Shandong University(Engineering Science)    2023, 53 (6): 1-7.   DOI: 10.6040/j.issn.1672-3961.0.2023.132
    Abstract294)   HTML7)    PDF(pc) (2618KB)(236)       Save

    Based on the challenge when deploying a deep learning-based face anti-spoofing (FAS) algorithm on general-purpose consumer devices with only RGB camera, an efficient and lightweight RGB frame-level FAS model (EL-FAS) was proposed. To improve the generalization ability of the model and achieve high performance under constrained conditions, a novel global spatial self-attention mechanism was explored to capture global feature dependencies, and an equal-channel pixel-wise binary supervision method was designed to force our model to learn shared features from different pixels. The Bottlenecks residual block was used to establish the backbone network to reduce parameters. Analysis and the experimental results showed that EL-FAS model achieved state-of-the-art performance in the OULU-NPU dataset, obtained competitive performance in the SiW dataset and cross-dataset tests. The model was lightweight, with only 1.34×106 parameters.

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    Application of fiber optic sensing technology in road traffic
    SONG Xiuguang, ZHAO Tao, BI Yanmei, ZHANG Zihao, DU Cong, TIAN Yuan, KONG Xiaoguang
    Journal of Shandong University(Engineering Science)    2024, 54 (2): 13-26.   DOI: 10.6040/j.issn.1672-3961.0.2023.252
    Abstract294)      PDF(pc) (1745KB)(340)       Save
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    Importance identification method based on multi-order neighborhood hierarchical association contribution of nodes
    Gang HU, Lemeng WANG, Zhiyu LU, Qin WANG, Xiang XU
    Journal of Shandong University(Engineering Science)    2024, 54 (1): 1-10.   DOI: 10.6040/j.issn.1672-3961.0.2022.390
    Abstract268)   HTML9)    PDF(pc) (5411KB)(164)       Save

    In order to identify the node importance more finely and extend the scope and category of effective information gathering of nodes, the spatial location attribute information of network nodes and their direct and indirect neighbor nodes were fused and clustered, a node importance identification method of multi-order neighbor hierarchical association contribution of complex networks was proposed. The definition of the contribution of node level location attributes was given based on the network node spatial location hierarchical differences and inter-layer association information. A complex network target node multi-order neighbor hierarchical association contributions matrix was constructed to characterize the hierarchical contribution of the associations between direct neighbor nodes, indirect neighbor nodes and target nodes to their influence. A node importance identification method that fused node topological location contribution across layers and levels of space with multi-order neighborhood hierarchical association contribution was proposed. The simulation experiments showed that the proposed method could effectively improve the precision and accuracy of node importance identification on six real networks. This study provided a scientific theoretical basis for in-depth exploration of the dynamic evolution mechanism behind the network, and then made prediction and regulation by exploring the multi-order hierarchical interaction behaviors among the network nodes.

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    Dynamic response parameters of wind turbine under thunderstorm downburst
    Chuncheng LIU,Qingxun TENG
    Journal of Shandong University(Engineering Science)    2023, 53 (6): 108-121.   DOI: 10.6040/j.issn.1672-3961.0.2023.080
    Abstract267)   HTML9)    PDF(pc) (16876KB)(90)       Save

    In order to study the time-domain characteristics of the impact wind of mobile thunderstorms and the characteristics of the dynamic response parameters of wind turbines under their action, the wind speed time history of the impact wind of mobile thunderstorms was first simulated using the harmonic superposition method. The finite element model of fan structure considering the coupling effect of blade and tower tube was established, and then the response distribution laws of acceleration, displacement, section stress and shear force along the height direction of tower tube were obtained. The acceleration and displacement responses of the blades and the tower were further analyzed considering the different blade stall angles when the fan was stopped. Considering the influence of different wind directions on the wind turbine, the frequency domain characteristics of the dynamic response were analyzed, and the variation patterns of vibration mode participation coefficient, tower top displacement and acceleration, and tower bottom bending moment amplitude with frequency were given. Research showed that the wind speed time history of a moving thunderstorm impact wind included two distinct peaks (0-T/3, T/3-T/2). The variation of the displacement response peak at different blade stop angles was closely related to the height of the location. The frequency of thunderstorm impact wind load and the first order dominant frequency (around 0.230 Hz) had a significant impact on the structural displacement and section bending moment amplitude.

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    Parameter design and effect evaluation of pile side splitting grouting insilty clay stratum
    Yuxin WANG,Sizhong LÜ,Wang YAO,Chunjin LIN,Ming ZHANG,Zhaofeng LI,Jian ZHANG,Yansheng WANG
    Journal of Shandong University(Engineering Science)    2023, 53 (6): 70-81.   DOI: 10.6040/j.issn.1672-3961.0.2023.093
    Abstract215)   HTML3)    PDF(pc) (11669KB)(75)       Save

    Aiming at the problem of insufficient bearing capacity of in-service pile foundation in silty clay stratum, numerical simulation and field test were used to realize the parameter design and reinforcement effect evaluation of in-service pile foundation grouting. The expanding form of split grouting vein was analyzed, the finite element model of grouting pressure transmission was established by applying volume strain to the vein, the distribution law of radial pressure on the pile side in silty clay stratum under different grouting conditions was studied, and the design method of grouting parameters was put forward. The attenuation of earth pressure with distance was nonlinear. Under certain soil parameters, when the grouting pressure was 2.0 MPa and the distance between grouting hole and pile side was 0.5 m, the radial pressure transmitted to pile side was larger. At the same time, taking the pile foundation in the reconstruction and expansion site of Beijing-Taibei Expressway as a model, the contour map of the increase range of pile foundation bearing capacity under different working conditions was drawn, and the pile foundation bearing capacity was increased by 30.3%-89.4% after grouting reinforcement, which provided reference for the reinforcement effect of in-service pile foundations.

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    The long-range perspective and challenges for the construction of lunar base
    JIANG Mingjing, WANG Siyuan, JIANG Pengming, HUA Yixiong, SHI Anning, YANG Yuequn, XUE Qiaobin, DAI Wanting, QIU Song
    Journal of Shandong University(Engineering Science)    2024, 54 (2): 114-125.   DOI: 10.6040/j.issn.1672-3961.0.2023.305
    Abstract202)      PDF(pc) (13427KB)(123)       Save
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    Real-time error estimation algorithm of free curve based on arc length parameters
    Yongliang LU,Wei ZHANG,Jun ZHAO,Zhen ZHANG,Zijian ZHANG
    Journal of Shandong University(Engineering Science)    2023, 53 (6): 143-151.   DOI: 10.6040/j.issn.1672-3961.0.2023.009
    Abstract181)   HTML1)    PDF(pc) (5463KB)(255)       Save

    Aiming at the problems that the machining accuracy of complex surface parts was required to be improved and it was difficult to accurately calculated the contour error in real time in the free curve tracking task, a real-time error estimation algorithm of free curve based on arc length parameters was proposed. In MATLAB/Simulink, non-uniform rational B-spline (NURBS) interpolation was used to plan the elliptical trajectory and the double twist trajectory. The real-time error estimation algorithm of free curve based on arc length parameters was compared with the contour error estimation accuracy and execution time of tangent line-based estimation, circular approximation, average velocity estimation and three points circular approximation. The simulation results showed that the real-time error estimation algorithm of free curve based on arc length parameters had better contour error estimation accuracy than the existing commonly used contour error estimation algorithm, and it was suitable for the case of large curvature free curve. The advanced cross-coupled control (CCC) scheme could be further designed by using this method.

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    Experiment of the model of hydration heat temperature field and strain field of concrete single box and three chamber girder
    Peng WANG, Cheng HUANG, Guohao ZHAO, Feng ZHANG
    Journal of Shandong University(Engineering Science)    2024, 54 (1): 109-122.   DOI: 10.6040/j.issn.1672-3961.0.2022.363
    Abstract172)   HTML4)    PDF(pc) (23691KB)(152)       Save

    In order to study the distribution law of concrete hydration heat temperature field and strain field in concrete single box and three chamber girder, a concrete box girder scaled-down(1∶2) model was cast in Laibin, 148 temperature sensors and 20 strain sensors were embedded in the concrete. Meteorological sensors were arranged, and the distribution law of hydration heat field of C60 high-strength concrete box girder was obtained through the analysis of field actual measurement data. The research results showed that the hydration heat of single-box three-compartment box girder was divided into three stages: temperature rise stage (0-24 h), rapid temperature drop stage (24-96 h) and smooth temperature drop stage (96-240 h). The average temperature of the box girder cross-section needed 179 h before it was lower than the entering temperature, the heat generated by the hydration of the box girder needed at least 7 d to be completely dissipated; the peak temperature of the whole cross-section was 24 h after pouring, and the highest area was at the pedicle axillary position, with the highest temperature reaching 90.2 ℃, and the maximum horizontal temperature difference of the top plate reached 32.2 ℃ at this time. Influenced by the layered pouring, the maximum vertical temperature difference of the side web reached 12 h after pouring 40.1 ℃, and the construction cold joints could be observed on the site. The temperature field distribution at the stalk axle was complicated, and the maximum transverse temperature difference at the stalk axle was 22.5 ℃ and the maximum vertical temperature difference was 29.9 ℃, and the transverse shrinkage strain at the surface of the stalk axil is smaller than the vertical one. The strain on the outer surface of the stalk axil is lower and constrained by the template, so the strain is smaller than that inside the stalk axil. it was calculated that there was a risk of vertical cracking in six pedicle axils, and the maximum shrinkage tensile stress was 1.51 times of the tensile strength.

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    Named entity recognition method combined with self-training model
    XIAO Wei, ZHENG Gengsheng, CHEN Yujia
    Journal of Shandong University(Engineering Science)    2024, 54 (2): 96-102.   DOI: 10.6040/j.issn.1672-3961.0.2022.353
    Abstract128)      PDF(pc) (1009KB)(180)       Save
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