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Numerical study of tri-hybrid nanofluids in a rectangular cavity with an enclosed circle via COMSOL and Levenberg-Marquardt method 基于COMSOL和Levenberg-Marquardt方法的矩形封闭圆腔中三混合纳米流体的数值研究
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-13 DOI: 10.1016/j.engappai.2026.114089
Sami Ul Haq , Arooj Tanveer , Muhammad Bilal Ashraf , Nidhal Becheikh , Kaouther Ghachem , Lioua Kolsi
This work focuses on a numerical simulation of magneto mixed convection transport in electrically conducting tri hybrid nanofluids that is enclosed in a two dimensional rectangular lid driven cavity with a cold circular obstacle. Dissipative processes due to viscous dissipation and Joule heating are taken into account and the non-dimensional governing equations are resolved by Galerkin finite-element method in COMSOL Multiphysics. The effects of the major controlling parameters, i.e. the Hartmann number (0.1M20), Reynolds number (100Re500), the Richardson number (0.1Ri10), and the nanoparticle volume-fraction coefficients (00.06), on the flow structure and heat-transfer characteristics are systematically evaluated. These findings indicate that Ha increase inhibits fluid motion by the force of Lorentz forces, thus minimising convective exchange of heat at the moving heated wall. On the other hand, increased values of Re significantly increase fluid flow and thermal mixing resulting in increased local and mean Nusselt numbers. Tri-hybrid nanoparticles (Au,Ag,TiO2) enhance the thermal capability of the base fluid by increasing the effective thermal conductivity, thereby, enhancing the overall heat-transfer rate in the base fluid. A high Richardson number works the flow field in the direction of buoyancy-dominated convection, dampens the contribution of forced-convection, and reduces the transfer of heat to that moving away of the upper moving wall. It uses an artificial neural network that has been trained using the Levenberg-Marquardt algorithm to forecasts and optimise the average Nusselt number, with excellent correspondence with computed data; the regression coefficient approaches one, and the mean squared error is small. High Reynolds number, low Hartmann number, low Richardson number, and moderate volume fractions of nanoparticle yield the best results with regard to heat-transfer performance, and thus, the study irrevocably supports the capability of integrating tri-hybrid nanofluids with data-driven optimization in the context of advanced thermal-management operations.
本文主要研究了磁性混合对流输运的数值模拟,该纳米流体被封闭在具有冷圆形障碍物的二维矩形盖驱动腔中。在COMSOL多物理场中,考虑了粘性耗散和焦耳加热引起的耗散过程,采用Galerkin有限元法求解了无量程控制方程。系统评价了哈特曼数(0.1≤M≤20)、雷诺数(100≤Re≤500)、理查德森数(0.1≤Ri≤10)、纳米颗粒体积分数系数(0≤∅≤0.06)等主要控制参数对流动结构和换热特性的影响。这些发现表明,Ha的增加通过洛伦兹力抑制流体运动,从而使运动加热壁上的对流换热最小化。另一方面,Re值的增加显著增加了流体流动和热混合,导致局部和平均努塞尔数增加。三杂化纳米粒子(Au、Ag、TiO2)通过提高基液的有效导热系数来增强基液的热性能,从而提高基液的整体传热速率。较高的理查德森数使流场向以浮力为主的对流方向发展,抑制了强制对流的贡献,减少了热量向远离上部运动壁面的转移。它使用经过Levenberg-Marquardt算法训练的人工神经网络来预测和优化平均努塞尔数,并与计算数据具有良好的对应关系;回归系数趋近于1,均方误差较小。高雷诺数、低哈特曼数、低理查德森数和中等体积分数的纳米颗粒可以产生最佳的传热性能,因此,该研究不可逆转地支持了将三混合纳米流体与先进热管理操作背景下的数据驱动优化相结合的能力。
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引用次数: 0
Machine learning-based prediction of ductility of strain-hardening fiber-reinforced cementitious composites 基于机器学习的应变硬化纤维增强胶凝复合材料塑性预测
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.113915
Tan Duy Phan, Van Thong Nguyen, Dong Joo Kim
The high ductility, characterized by both strain capacity and average crack spacing, of strain-hardening fiber-reinforced cement composites (SH-FRCCs) is expected to enhance the load-carrying capacity and durability of buildings and infrastructure made of SH-FRCCs. This study aimed to predict the strain capacity and average crack spacing of SH-FRCCs using four popular machine learning (ML) models: k-nearest neighbor (k-NN), decision tree (DT), random forest (RF), and adaptive boosting (ADB) models. Nine input variables, the matrix compressive strength, fiber type 1, tensile strength of fiber 1, fiber type 2, tensile strength of fiber 2, fiber index, specimen width, specimen thickness, and gauge length were considered in the ML models. Among the investigated ML models, the RF model exhibited relatively good performance in predicting the strain capacity (R2 = 0.986) and log-transform crack spacing (R2 = 0.955) of SH-FRCCs in training data. The better performance of the RF model is attributed to the model's ensemble structure, which integrates multiple decision trees, effectively reduces variance, and manages complex data structures. Fiber index is the most influential variable on both strain capacity and average crack spacing of SH-FRCCs, based on SHapley Additive Explanations (SHAP) and Partial Dependence Plots (PDP) analysis. The strain capacity of SH-FRCCs decreased with increasing specimen width and gauge length, whereas crack spacing increased with specimen width. Finally, the developed ML model was validated against experimental data, showing excellent agreement with deviations below 10 % for strain capacity and around 11 % for average crack spacing.
应变硬化纤维增强水泥复合材料(sh - frcc)具有应变能力和平均裂缝间距的高延性,有望提高sh - frcc建筑和基础设施的承载能力和耐久性。本研究旨在使用四种流行的机器学习(ML)模型预测sh - frcc的应变能力和平均裂缝间距:k-最近邻(k-NN)、决策树(DT)、随机森林(RF)和自适应增强(ADB)模型。ML模型考虑了9个输入变量,即基体抗压强度、纤维类型1、纤维类型1的抗拉强度、纤维类型2的抗拉强度、纤维指数、试件宽度、试件厚度和试件长度。在所研究的ML模型中,RF模型在预测训练数据中sh - frcc的应变能力(R2 = 0.986)和对数变换裂缝间距(R2 = 0.955)方面表现较好。RF模型的良好性能归功于模型的集成结构,该结构集成了多个决策树,有效地减少了方差,并管理了复杂的数据结构。基于SHapley加性解释(SHAP)和偏相关图(PDP)分析,纤维指数是sh - frcc应变能力和平均裂缝间距影响最大的变量。sh - frcc的应变能力随试件宽度和规范长度的增加而减小,而裂纹间距随试件宽度的增加而增大。最后,根据实验数据验证了所开发的ML模型,结果表明,应变能力的偏差低于10%,平均裂纹间距的偏差约为11%。
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引用次数: 0
A communication-efficient federated learning method for traffic flow prediction 交通流预测的高效通信联邦学习方法
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.114182
Kaiju Li , Qiang Xu , Dong Wang , Xiang Nie , Hao Wang
Federated learning is increasingly adopted for traffic flow prediction (TFP) to enable privacy preserving collaboration across distributed sensors. However, real-world deployments are highly heterogeneous in computational capability, causing stragglers that dominate per-round latency and severely slow down model updates. Most existing approaches mitigate stragglers by suppressing or discarding slow clients, which reduce data representativeness and introduce training bias. It is a harmful trade-off for TFP where broad spatial coverage is crucial for accuracy. We propose a communication-efficient logical clustering federated learning framework (LCFed) that mitigates stragglers by logically balancing effective training time while preserving full client participation. LCFed combines a coarse-grained logical dynamic clustering algorithm (LoDynClust) to balance computational resources across clusters and reduce synchronization delays, with a fine-grained intra-cluster adaptive collaborative training mechanism (ICACT) to regulate aggregation intervals and mitigate training bias. We further provide a convergence analysis. Extensive experiments on three real-world traffic datasets show that LCFed significantly reduces training latency caused by stragglers while maintaining competitive prediction accuracy compared with state-of-the-art baselines.
联邦学习越来越多地用于交通流量预测(TFP),以实现跨分布式传感器的隐私保护协作。然而,现实世界的部署在计算能力上是高度异构的,这导致了每轮延迟中占主导地位的掉队者,并严重减慢了模型更新速度。大多数现有方法通过抑制或丢弃慢客户端来减轻掉队者,这降低了数据的代表性并引入了训练偏差。对于TFP来说,这是一种有害的权衡,因为广泛的空间覆盖对准确性至关重要。我们提出了一种通信高效的逻辑聚类联邦学习框架(LCFed),该框架通过逻辑平衡有效的训练时间,同时保持客户端完全参与,从而减少了离散者。LCFed结合了粗粒度逻辑动态聚类算法(LoDynClust)来平衡集群间的计算资源和减少同步延迟,以及细粒度集群内自适应协同训练机制(ICACT)来调节聚合间隔和减轻训练偏差。我们进一步提供了收敛性分析。在三个真实交通数据集上进行的大量实验表明,LCFed显著降低了由掉队者引起的训练延迟,同时与最先进的基线相比保持了具有竞争力的预测精度。
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引用次数: 0
Separable physical spatiotemporal graph message aggregation for fault diagnosis 面向故障诊断的可分离物理时空图信息聚合
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-13 DOI: 10.1016/j.engappai.2026.114109
Kuangchi Sun , Aijun Yin , Yihua Hu
Spatiotemporal graph has become a research hotspot for it can excavate spatiotemporal information in multi-sensor fault diagnosis. However, the existing methods do not fully consider the physical attenuation characteristics in edge when the fault features are transmitted to the next sensor in the case of cross-sensor spatial temporal correlation. Besides, existing spatiotemporal convolutional networks pay much attention to the integration of all nodes for information update and the network structure design without realize the aggregation of edge information with different attributes. To address these issues, we propose Separable Physical Spatiotemporal Graph Message Aggregation (SPSGMA) for Fault Diagnosis. Firstly, a spatiotemporal graph of physical connection properties across sensors is proposed to assign different properties to different edges. Then, a novel wavelet frequency selection method is proposed for node feature extraction of different physical edge. Finally, a separable message aggregation network is designed to realize aggregation of frequency messages on different physical edges and classification rather than unified feature extraction. Three different datasets are used to verify the effectiveness of SPSGMA. Compared with other methods, SPSGMA achieves the best diagnostic performance in long chain sensor data diagnosis, and its average diagnosis accuracy in different diagnosis respectively are 99.99%, 98.59%, and 99.93%.
时空图由于能够挖掘多传感器故障诊断中的时空信息而成为研究热点。然而,现有方法在跨传感器时空相关的情况下,没有充分考虑故障特征传递到下一个传感器时边缘的物理衰减特性。此外,现有的时空卷积网络注重对所有节点进行信息更新和网络结构设计的整合,没有实现不同属性边缘信息的聚合。为了解决这些问题,我们提出了用于故障诊断的可分离物理时空图消息聚合(SPSGMA)。首先,提出了传感器间物理连接属性的时空图,为不同的边缘分配不同的属性;然后,提出了一种新的小波频率选择方法,用于不同物理边缘的节点特征提取。最后,设计了一个可分离的消息聚合网络,实现了不同物理边缘上频率消息的聚合和分类,而不是统一的特征提取。使用三个不同的数据集来验证SPSGMA的有效性。与其他方法相比,SPSGMA在长链传感器数据诊断中获得了最好的诊断性能,其在不同诊断中的平均诊断准确率分别为99.99%、98.59%和99.93%。
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引用次数: 0
Multi-label financial statement fraud detection based on long short-term memory and multilayer perceptron hybrid model 基于长短期记忆和多层感知器混合模型的多标签财务报表舞弊检测
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.114188
Zhensong Chen , Hao Chen , Yanxin Liu , Yong Shi
The detection of financial statement fraud holds paramount importance due to its impact on economic order, public trust, and legal accountability. However, existing studies often treat it as a binary classification problem, while overlooking the valuable information from correlations between various fraud types. To address this issue, we propose a multi-label financial statement detection framework to identify all distinct types of fraudulent behaviors, including inflated profits, inflated assets, false statements, delay in disclosure, and omission of significant information. In the proposed framework, a Long Short-Term Memory (LSTM) network with a MultiLayer Perceptron (MLP) are integrated to effectively capture temporal dependencies and correlations among different types of fraud. Furthermore, we employ interpretability techniques to analyze the differences and connections between various types of fraud and different financial features. Empirical results on real Chinese datasets have demonstrated the effectiveness of the proposed multi-label classification framework, verified its superiority over traditional binary classification models, and maintained robustness in the case of class imbalance. In addition, we propose a novel Top-K thresholding strategy. Its core idea is to determine specific fraud types involved based on an initial assessment of the severity of its fraudulent behavior. Overall, this research contributes to the field of financial statement fraud detection by introducing a multi-label classification framework and conducting thorough interpretability analysis. This advancement not only provides auditors and regulators with actionable tools for more targeted investigations but also fosters more comprehensive understanding of the mechanisms underlying financial fraud.
由于财务报表舞弊对经济秩序、公众信任和法律责任的影响,财务报表舞弊的发现具有至关重要的意义。然而,现有的研究往往将其视为一个二元分类问题,而忽略了各种欺诈类型之间的相关性所提供的有价值的信息。为了解决这一问题,我们提出了一个多标签财务报表检测框架,以识别所有不同类型的欺诈行为,包括虚增利润、虚增资产、虚假陈述、延迟披露和遗漏重要信息。在提出的框架中,将长短期记忆(LSTM)网络与多层感知器(MLP)集成在一起,以有效捕获不同类型欺诈之间的时间依赖性和相关性。此外,我们采用可解释性技术来分析不同类型的欺诈和不同财务特征之间的差异和联系。在真实中文数据集上的实证结果证明了所提出的多标签分类框架的有效性,验证了其相对于传统二元分类模型的优越性,并在类不平衡的情况下保持了鲁棒性。此外,我们提出了一种新的Top-K阈值策略。其核心思想是根据对欺诈行为严重程度的初步评估,确定所涉及的具体欺诈类型。总体而言,本研究通过引入多标签分类框架并进行深入的可解释性分析,为财务报表舞弊检测领域做出了贡献。这一进步不仅为审计人员和监管机构提供了可操作的工具,以进行更有针对性的调查,而且还促进了对财务欺诈机制的更全面理解。
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引用次数: 0
Neighborhood constrained attention for lightweight image super-resolution 轻量级图像超分辨率的邻域约束关注
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.114119
Rui He , Zhenyang Zhu , Xiaoyang Mao
In recent years, to improve image super-resolution performance, several studies have explored integrating convolutional modules with vision transformers (ViTs) to enhance the local feature modeling of ViTs. However, these hybrid approaches often introduce inconsistencies in feature representation, redundant information, and an increased number of parameters, ultimately limiting both performance and computational efficiency. To overcome these challenges, we propose a novel neighborhood constrained attention (NCA) mechanism that enables transformers to effectively capture both local and global features without requiring additional convolutional modules. Specifically, we first divide the window into a set of r×r grids, treating them as local features, and then explore both intra- and inter-relationships within and across these local features, using them as constraints to refine window attention. Furthermore, instead of relying on averaging or other heuristic schemes for assigning labels to local features, we combine them through a linear transformation, ensuring label accuracy and uniqueness. Extensive experiments demonstrate that the proposed NCA not only outperforms other state-of-the-art lightweight approaches on public benchmark datasets but also excels in engineering image datasets, such as automated defect detection and product quality inspection, while requiring fewer parameters and lower computational costs. Notably, compared to ×4 SwinIR-light (SwinIR: Image Restoration Using Swin Transformer), NCA achieves an average performance gain of 0.28 dB across five public test sets while reducing network parameters by 27% and computational complexity (floating point operations, FLOPs) by 30%. Code and models are obtainable at https://github.com/hms-source/NCA.
近年来,为了提高图像的超分辨率性能,一些研究探索了将卷积模块与视觉变形器(ViTs)相结合,以增强视觉变形器的局部特征建模。然而,这些混合方法通常会引入特征表示的不一致、冗余信息和参数数量的增加,最终限制了性能和计算效率。为了克服这些挑战,我们提出了一种新的邻域约束注意(NCA)机制,使变压器能够有效地捕获局部和全局特征,而无需额外的卷积模块。具体来说,我们首先将窗口划分为一组r×r网格,将它们视为局部特征,然后探索这些局部特征内部和之间的内部和相互关系,使用它们作为约束来优化窗口注意力。此外,我们不是依靠平均或其他启发式方案来为局部特征分配标签,而是通过线性变换将它们组合起来,确保了标签的准确性和唯一性。大量的实验表明,所提出的NCA不仅在公共基准数据集上优于其他最先进的轻量级方法,而且在工程图像数据集上也表现出色,例如自动缺陷检测和产品质量检测,同时需要更少的参数和更低的计算成本。值得注意的是,与×4 SwinIR-light (SwinIR:使用Swin Transformer进行图像恢复)相比,NCA在五个公共测试集中实现了0.28 dB的平均性能增益,同时将网络参数降低了27%,计算复杂度(浮点运算,FLOPs)降低了30%。代码和模型可在https://github.com/hms-source/NCA上获得。
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引用次数: 0
Multiphysics response and internal leakage prediction of seismic hydraulic systems considering structural clearance effects 考虑结构间隙效应的地震液压系统多物理场响应及内泄漏预测
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.114140
Donglai Li , Jianying Li , Tiefeng Li , Xiaoyan Du
Accurate prediction of internal leakage in valve controlled hydraulic systems remains challenging because of the strong nonlinear coupling among pressure, clearance, and transient flow behavior. This study develops a multiphysics modeling framework that integrates computational fluid dynamics (CFD) with a Physics constrained Kernel Additive Network for Leakage Prediction (PKAN-LP). A dynamic mesh simulation of the spool valve and hydraulic cylinder is employed to capture the influence of structural clearances on leakage evolution. By embedding residuals from the Navier-Stokes and Reynolds equations, the PKAN-LP framework enables structure driven learning and enhances prediction stability and physical consistency across both steady and transient regimes. The results demonstrate that PKAN-LP achieves accurate and physically coherent predictions, effectively mitigating leakage overshoot under high pressure and large clearance conditions. Shapley Additive Explanations (SHAP) based sensitivity analysis reveals that radial clearance is the dominant factor, followed by valve opening and inlet pressure, and their interactions govern the nonlinear leakage behavior. This study advances physics informed modeling of hydraulic systems by bridging data driven learning with physical interpretability, providing a generalizable framework for modeling and optimization of high-pressure hydraulic systems.
由于压力、间隙和瞬态流动特性之间存在强烈的非线性耦合,阀控液压系统内泄漏的准确预测仍然具有挑战性。本研究开发了一个多物理场建模框架,该框架将计算流体动力学(CFD)与物理约束的泄漏预测核加性网络(PKAN-LP)相结合。采用滑阀和液压缸的动态网格仿真,捕捉结构间隙对泄漏演变的影响。通过嵌入Navier-Stokes和Reynolds方程的残差,PKAN-LP框架实现了结构驱动的学习,并增强了稳定和瞬态状态下的预测稳定性和物理一致性。结果表明,PKAN-LP实现了准确且物理一致的预测,有效减轻了高压和大间隙条件下的泄漏超调。基于Shapley加性解释(SHAP)的灵敏度分析表明,径向间隙是影响非线性泄漏的主导因素,其次是阀门开度和进口压力,它们的相互作用决定了非线性泄漏行为。该研究通过将数据驱动学习与物理可解释性相结合,推进了液压系统的物理建模,为高压液压系统的建模和优化提供了一个可推广的框架。
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引用次数: 0
Explainable artificial intelligence-Infused hybrid transfer learning framework with multiscale feature fusion for brain tumor detection and classification 基于多尺度特征融合的可解释人工智能混合迁移学习框架用于脑肿瘤检测与分类
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-13 DOI: 10.1016/j.engappai.2026.114128
Shahid Mohammad Ganie , Rama Chaithanya Tanguturi , Manahil Mohammed Alfuraydan
Brain tumors represent a significant health issue and are a leading cause of cancer-related fatalities globally. Early detection and accurate classification approaches are essential for addressing this critical health issue. This study proposes a novel hybrid deep multiscale integration network (DMI-Net) model for brain tumor diagnosis using magnetic resonance imaging (MRI) dataset. Image preprocessing included resizing, contrast enhancement using contrast-limited adaptive histogram equalization (CLAHE), normalization, and Gaussian filtering to enhance image quality. A lightweight parallel depthwise separable convolutional neural network (PD-CNN) is designed to extract multiscale relevant features with minimum computational resources. Principal component analysis (PCA), linear discriminant analysis (LDA), uniform manifold approximation and projection (UMAP), and t-distributed stochastic neighbor embedding (t-SNE) were used to visualize and validate the class-separable structure of the feature space in interpretability assessment. The hybrid framework was developed by stacking and concatenating three top-performing transfer learning (TL) models and integrating them with the PD-CNN architecture. Evaluation was conducted using standard performance metrics. For interpretability in clinical decision-support, model outputs were analyzed using shapley additive explanations (SHAP) and gradient-weighted class activation mapping (Grad-CAM) and its variants. The DMI-Net model demonstrated superior results compared with eight TL models, achieving an accuracy of 99.24%, precision of 99.00%, recall of 98.42%, F1-score of 98.54%, and area under the receiver operating characteristic curve of 98.85%. It outperformed existing state-of-the-art studies in the literature. The results indicate the potential utility of the proposed model for increasing confidence in diagnosing brain tumors, supporting clinical decision-making.
脑瘤是一个重大的健康问题,也是全球癌症相关死亡的主要原因。早期发现和准确分类方法对于解决这一严重的健康问题至关重要。本研究提出了一种基于磁共振成像(MRI)数据集的新型混合深度多尺度集成网络(DMI-Net)脑肿瘤诊断模型。图像预处理包括调整大小、使用对比度限制自适应直方图均衡化(CLAHE)增强对比度、归一化和高斯滤波来增强图像质量。设计了一种轻量级并行深度可分卷积神经网络(PD-CNN),以最小的计算资源提取多尺度相关特征。采用主成分分析(PCA)、线性判别分析(LDA)、均匀流形逼近与投影(UMAP)和t分布随机邻居嵌入(t-SNE)对可解释性评价中特征空间的可分类结构进行可视化和验证。混合框架是通过堆叠和连接三个表现最好的迁移学习(TL)模型并将它们与PD-CNN架构集成而成的。使用标准性能指标进行评估。为了临床决策支持的可解释性,使用shapley加性解释(SHAP)和梯度加权类激活映射(Grad-CAM)及其变体分析模型输出。DMI-Net模型的准确率为99.24%,精密度为99.00%,召回率为98.42%,f1评分为98.54%,受试者工作特征曲线下面积为98.85%。它优于文献中现有的最先进的研究。结果表明,所提出的模型在提高诊断脑肿瘤的信心,支持临床决策方面具有潜在的效用。
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引用次数: 0
Prediction of flutter derivatives for closed-box bridge girder: A feature-fusion residual neural network algorithm 闭箱梁颤振导数的特征融合残差神经网络预测
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-13 DOI: 10.1016/j.engappai.2026.114142
Chuanting Liu , Genshen Fang , Zuopeng Wen , Ke Li , Yaojun Ge
Flutter derivatives are crucial parameters for aerodynamic performance analysis of long-span bridges, which are typically identified through time-consuming and costly methods such as wind tunnel tests or computational fluid dynamics (CFD). This study proposes a deep learning approach for the rapid identification of the flutter derivatives of closed-box girders, utilizing feature-fusion residual network architecture (FF-ResNet). We construct a dataset comprising flutter derivatives of 113 cross-sections at eight reduced wind speeds, and the flutter derivatives are identified via multi-frequency forced vibration CFD simulations. Then, the reduced wind speed and a pre-processed image of the cross-section are used as inputs, and the model is trained to learn multi-modal features. Bayesian optimization is employed to enhance predictive accuracy for flutter derivatives, with the model achieving r-squared (R2) values exceeding 0.97 on the training set and 0.92 on the validation set; in 10-fold cross-validation, the average R2 of the validation set across ten folds also exceeds 0.92, demonstrating high accuracy. Next, the model is used to analyze the variation of flutter derivatives across the aerodynamic shape range, and the SHapley Additive exPlanations (SHAP) algorithm is applied to investigate the importance of the geometric parameters. The predicted flutter derivatives are then employed to compute the critical wind speed distribution over the range of considered cross-section variations.
颤振导数是大跨度桥梁气动性能分析的关键参数,通常通过风洞试验或计算流体动力学(CFD)等耗时且昂贵的方法进行识别。本研究提出了一种基于特征融合残差网络架构(FF-ResNet)的闭箱梁颤振导数快速识别的深度学习方法。本文构建了一个包含8种降低风速下113个截面颤振导数的数据集,并通过多频强迫振动CFD模拟来识别颤振导数。然后,将降低后的风速和预处理后的横截面图像作为输入,训练模型学习多模态特征。采用贝叶斯优化方法提高了颤振导数的预测精度,模型在训练集和验证集上的r-squared (R2)值分别超过0.97和0.92;在10次交叉验证中,验证集跨10次的平均R2也超过0.92,显示出较高的准确性。其次,利用该模型分析了颤振导数在气动形状范围内的变化,并采用SHapley加性解释(SHAP)算法研究了几何参数的重要性。然后利用预测的颤振导数计算在考虑的截面变化范围内的临界风速分布。
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引用次数: 0
Spatio-temporal grey Bernoulli model for green development of marine economy forecasting 海洋经济绿色发展的时空灰色伯努利模型预测
IF 8 2区 计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engappai.2026.113984
Na Li , Xuemei Li , Song Ding
The sustainable development of the marine economy is inseparable from green development. However, the spatial correlations and dynamic evolution of green development present significant forecasting challenges. To address this, this paper first constructs an evaluation index system for the green development of marine economy based on the Driver-Pressure-State-Impact-Response (DPSIR) framework. Furthermore, the grey Bernoulli model is improved in both spatial and temporal dimensions for forecasting purposes. Interaction terms between spatial distance matrices and variables are introduced to capture spatial correlations, while a time-varying component is incorporated to reflect dynamic evolution. These enhancements enable the model to more effectively characterize the spatial, temporal, and nonlinear features of the green development of marine economy. Additionally, the model’s hyperparameters and weighting coefficients are optimized using the whale optimization algorithm. For validation, an empirical study is conducted across China’s 11 coastal provinces and municipalities. Systematic analyses show that the proposed model has high predictive accuracy. Robustness tests and sensitivity analysis further confirm that the model demonstrates excellent stability, reliability, and generalization capability.
海洋经济的可持续发展离不开绿色发展。然而,绿色发展的空间相关性和动态演变给预测带来了重大挑战。为此,本文首先构建了基于驱动-压力-状态-影响-响应(DPSIR)框架的海洋经济绿色发展评价指标体系。此外,灰色伯努利模型在空间和时间两个维度上进行了改进,以达到预测目的。引入空间距离矩阵和变量之间的相互作用项来捕捉空间相关性,同时引入时变分量来反映动态演变。这些改进使模型能够更有效地表征海洋经济绿色发展的空间、时间和非线性特征。此外,使用鲸鱼优化算法对模型的超参数和权重系数进行优化。为了验证,我们在中国11个沿海省市进行了实证研究。系统分析表明,该模型具有较高的预测精度。鲁棒性检验和敏感性分析进一步证实了该模型具有良好的稳定性、可靠性和泛化能力。
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引用次数: 0
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Engineering Applications of Artificial Intelligence
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