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Decision tree support vector machine based on genetic algorithm for multi-class classification 被引量:17
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作者 Huanhuan Chen Qiang Wang Yi Shen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第2期322-326,共5页
To solve the multi-class fault diagnosis tasks, decision tree support vector machine (DTSVM), which combines SVM and decision tree using the concept of dichotomy, is proposed. Since the classification performance of... To solve the multi-class fault diagnosis tasks, decision tree support vector machine (DTSVM), which combines SVM and decision tree using the concept of dichotomy, is proposed. Since the classification performance of DTSVM highly depends on its structure, to cluster the multi-classes with maximum distance between the clustering centers of the two sub-classes, genetic algorithm is introduced into the formation of decision tree, so that the most separable classes would be separated at each node of decisions tree. Numerical simulations conducted on three datasets compared with "one-against-all" and "one-against-one" demonstrate the proposed method has better performance and higher generalization ability than the two conventional methods. 展开更多
关键词 support vector machine (svm decision tree GENETICALGORITHM classification.
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Classification using wavelet packet decomposition and support vector machine for digital modulations 被引量:4
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作者 Zhao Fucai Hu Yihua Hao Shiqi 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第5期914-918,共5页
To make the modulation classification system more suitable for signals in a wide range of signal to noise rate (SNR), a feature extraction method based on signal wavelet packet transform modulus maxima matrix (WPT... To make the modulation classification system more suitable for signals in a wide range of signal to noise rate (SNR), a feature extraction method based on signal wavelet packet transform modulus maxima matrix (WPTMMM) and a novel support vector machine fuzzy network (SVMFN) classifier is presented. The WPTMMM feature extraction method has less computational complexity, more stability, and has the preferable advantage of robust with the time parallel moving and white noise. Further, the SVMFN uses a new definition of fuzzy density that incorporates accuracy and uncertainty of the classifiers to improve recognition reliability to classify nine digital modulation types (i.e. 2ASK, 2FSK, 2PSK, 4ASK, 4FSK, 4PSK, 16QAM, MSK, and OQPSK). Computer simulation shows that the proposed scheme has the advantages of high accuracy and reliability (success rates are over 98% when SNR is not lower than 0dB), and it adapts to engineering applications. 展开更多
关键词 modulation classification wavelet packet transform modulus maxima matrix support vector machine fuzzy density.
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Huberized Multiclass Support Vector Machine for Microarray Classification 被引量:7
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作者 LI Jun-Tao JIA Ying-Min 《自动化学报》 EI CSCD 北大核心 2010年第3期399-405,共7页
关键词 基因 支持向量机 计算方法 路径系数
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Quintic spline smooth semi-supervised support vector classification machine 被引量:1
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作者 Xiaodan Zhang Jinggai Ma +1 位作者 Aihua Li Ang Li 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第3期626-632,共7页
A semi-supervised vector machine is a relatively new learning method using both labeled and unlabeled data in classifi- cation. Since the objective function of the model for an unstrained semi-supervised vector machin... A semi-supervised vector machine is a relatively new learning method using both labeled and unlabeled data in classifi- cation. Since the objective function of the model for an unstrained semi-supervised vector machine is not smooth, many fast opti- mization algorithms cannot be applied to solve the model. In order to overcome the difficulty of dealing with non-smooth objective functions, new methods that can solve the semi-supervised vector machine with desired classification accuracy are in great demand. A quintic spline function with three-times differentiability at the ori- gin is constructed by a general three-moment method, which can be used to approximate the symmetric hinge loss function. The approximate accuracy of the quintic spiine function is estimated. Moreover, a quintic spline smooth semi-support vector machine is obtained and the convergence accuracy of the smooth model to the non-smooth one is analyzed. Three experiments are performed to test the efficiency of the model. The experimental results show that the new model outperforms other smooth models, in terms of classification performance. Furthermore, the new model is not sensitive to the increasing number of the labeled samples, which means that the new model is more efficient. 展开更多
关键词 SEMI-SUPERVISED support vector classification machine SMOOTH quintic spline function convergence.
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Parameter selection of support vector machine for function approximation based on chaos optimization 被引量:18
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作者 Yuan Xiaofang Wang Yaonan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第1期191-197,共7页
The support vector machine (SVM) is a novel machine learning method, which has the ability to approximate nonlinear functions with arbitrary accuracy. Setting parameters well is very crucial for SVM learning results... The support vector machine (SVM) is a novel machine learning method, which has the ability to approximate nonlinear functions with arbitrary accuracy. Setting parameters well is very crucial for SVM learning results and generalization ability, and now there is no systematic, general method for parameter selection. In this article, the SVM parameter selection for function approximation is regarded as a compound optimization problem and a mutative scale chaos optimization algorithm is employed to search for optimal paraxneter values. The chaos optimization algorithm is an effective way for global optimal and the mutative scale chaos algorithm could improve the search efficiency and accuracy. Several simulation examples show the sensitivity of the SVM parameters and demonstrate the superiority of this proposed method for nonlinear function approximation. 展开更多
关键词 learning systems support vector machines (svm approximation theory parameter selection optimization.
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Optimization of support vector machine power load forecasting model based on data mining and Lyapunov exponents 被引量:7
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作者 牛东晓 王永利 马小勇 《Journal of Central South University》 SCIE EI CAS 2010年第2期406-412,共7页
According to the chaotic and non-linear characters of power load data,the time series matrix is established with the theory of phase-space reconstruction,and then Lyapunov exponents with chaotic time series are comput... According to the chaotic and non-linear characters of power load data,the time series matrix is established with the theory of phase-space reconstruction,and then Lyapunov exponents with chaotic time series are computed to determine the time delay and the embedding dimension.Due to different features of the data,data mining algorithm is conducted to classify the data into different groups.Redundant information is eliminated by the advantage of data mining technology,and the historical loads that have highly similar features with the forecasting day are searched by the system.As a result,the training data can be decreased and the computing speed can also be improved when constructing support vector machine(SVM) model.Then,SVM algorithm is used to predict power load with parameters that get in pretreatment.In order to prove the effectiveness of the new model,the calculation with data mining SVM algorithm is compared with that of single SVM and back propagation network.It can be seen that the new DSVM algorithm effectively improves the forecast accuracy by 0.75%,1.10% and 1.73% compared with SVM for two random dimensions of 11-dimension,14-dimension and BP network,respectively.This indicates that the DSVM gains perfect improvement effect in the short-term power load forecasting. 展开更多
关键词 power load forecasting support vector machine (svm Lyapunov exponent data mining embedding dimension feature classification
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Support vector machine forecasting method improved by chaotic particle swarm optimization and its application 被引量:11
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作者 李彦斌 张宁 李存斌 《Journal of Central South University》 SCIE EI CAS 2009年第3期478-481,共4页
By adopting the chaotic searching to improve the global searching performance of the particle swarm optimization (PSO), and using the improved PSO to optimize the key parameters of the support vector machine (SVM) for... By adopting the chaotic searching to improve the global searching performance of the particle swarm optimization (PSO), and using the improved PSO to optimize the key parameters of the support vector machine (SVM) forecasting model, an improved SVM model named CPSO-SVM model was proposed. The new model was applied to predicting the short term load, and the improved effect of the new model was proved. The simulation results of the South China Power Market’s actual data show that the new method can effectively improve the forecast accuracy by 2.23% and 3.87%, respectively, compared with the PSO-SVM and SVM methods. Compared with that of the PSO-SVM and SVM methods, the time cost of the new model is only increased by 3.15 and 4.61 s, respectively, which indicates that the CPSO-SVM model gains significant improved effects. 展开更多
关键词 chaotic searching particle swarm optimization (PSO) support vector machine (svm short term load forecast
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Incremental support vector machine algorithm based on multi-kernel learning 被引量:7
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作者 Zhiyu Li Junfeng Zhang Shousong Hu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第4期702-706,共5页
A new incremental support vector machine (SVM) algorithm is proposed which is based on multiple kernel learning. Through introducing multiple kernel learning into the SVM incremental learning, large scale data set l... A new incremental support vector machine (SVM) algorithm is proposed which is based on multiple kernel learning. Through introducing multiple kernel learning into the SVM incremental learning, large scale data set learning problem can be solved effectively. Furthermore, different punishments are adopted in allusion to the training subset and the acquired support vectors, which may help to improve the performance of SVM. Simulation results indicate that the proposed algorithm can not only solve the model selection problem in SVM incremental learning, but also improve the classification or prediction precision. 展开更多
关键词 support vector machine (svm incremental learning multiple kernel learning (MKL).
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Application of signal processing and support vector machine to transverse cracking detection in asphalt pavement 被引量:5
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作者 YANG Qun ZHOU Shi-shi +1 位作者 WANG Ping ZHANG Jun 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2451-2462,共12页
Vibration-based pavement condition(roughness and obvious anomalies)monitoring has been expanding in road engineering.However,the indistinctive transverse cracking has hardly been considered.Therefore,a vehicle-based n... Vibration-based pavement condition(roughness and obvious anomalies)monitoring has been expanding in road engineering.However,the indistinctive transverse cracking has hardly been considered.Therefore,a vehicle-based novel method is proposed for detecting the transverse cracking through signal processing techniques and support vector machine(SVM).The vibration signals of the car traveling on the transverse-cracked and the crack-free sections were subjected to signal processing in time domain,frequency domain and wavelet domain,aiming to find indices that can discriminate vibration signal between the cracked and uncracked section.These indices were used to form 8 SVM models.The model with the highest accuracy and F1-measure was preferred,consisting of features including vehicle speed,range,relative standard deviation,maximum Fourier coefficient,and wavelet coefficient.Therefore,a crack and crack-free classifier was developed.Then its feasibility was investigated by 2292 pavement sections.The detection accuracy and F1-measure are 97.25%and 85.25%,respectively.The cracking detection approach proposed in this paper and the smartphone-based detection method for IRI and other distress may form a comprehensive pavement condition survey system. 展开更多
关键词 asphalt pavement transverse crack detection vehicle vibration support vector machine classification model
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New family of piecewise smooth support vector machine 被引量:3
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作者 Qing Wu Leyou Zhang Wan Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第3期618-625,共8页
Support vector machines (SVMs) have been extensively studied and have shown remarkable success in many applications. A new family of twice continuously differentiable piecewise smooth functions are used to smooth th... Support vector machines (SVMs) have been extensively studied and have shown remarkable success in many applications. A new family of twice continuously differentiable piecewise smooth functions are used to smooth the objective function of uncon- strained SVMs. The three-order piecewise smooth support vector machine (TPWSSVMd) is proposed. The piecewise functions can get higher and higher approximation accuracy as required with the increase of parameter d. The global convergence proof of TPWSSVMd is given with the rough set theory. TPWSSVMd can efficiently handle large scale and high dimensional problems. Nu- merical results demonstrate TPWSSVMa has better classification performance and learning efficiency than other competitive base- lines. 展开更多
关键词 support vector machine (svm piecewise smooth function smooth technique bound of convergence.
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Probabilistic back analysis for geotechnical engineering based on Bayesian and support vector machine 被引量:2
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作者 陈炳瑞 赵洪波 +1 位作者 茹忠亮 李贤 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第12期4778-4786,共9页
Geomechanical parameters are complex and uncertain.In order to take this complexity and uncertainty into account,a probabilistic back-analysis method combining the Bayesian probability with the least squares support v... Geomechanical parameters are complex and uncertain.In order to take this complexity and uncertainty into account,a probabilistic back-analysis method combining the Bayesian probability with the least squares support vector machine(LS-SVM) technique was proposed.The Bayesian probability was used to deal with the uncertainties in the geomechanical parameters,and an LS-SVM was utilized to establish the relationship between the displacement and the geomechanical parameters.The proposed approach was applied to the geomechanical parameter identification in a slope stability case study which was related to the permanent ship lock within the Three Gorges project in China.The results indicate that the proposed method presents the uncertainties in the geomechanical parameters reasonably well,and also improves the understanding that the monitored information is important in real projects. 展开更多
关键词 geotechnical engineering back analysis UNCERTAINTY Bayesian theory least square method support vector machine(svm)
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Hooke and Jeeves algorithm for linear support vector machine 被引量:1
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作者 Yeqing Liu Sanyang Liu Mingtao Gu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第1期138-141,共4页
Coordinate descent method is a unconstrained optimization technique. When it is applied to support vector machine (SVM), at each step the method updates one component of w by solving a one-variable sub-problem while... Coordinate descent method is a unconstrained optimization technique. When it is applied to support vector machine (SVM), at each step the method updates one component of w by solving a one-variable sub-problem while fixing other components. All components of w update after one iteration. Then go to next iteration. Though the method converges and converges fast in the beginning, it converges slow for final convergence. To improve the speed of final convergence of coordinate descent method, Hooke and Jeeves algorithm which adds pattern search after every iteration in coordinate descent method was applied to SVM and a global Newton algorithm was used to solve one-variable subproblems. We proved the convergence of the algorithm. Experimental results show Hooke and Jeeves' method does accelerate convergence specially for final convergence and achieves higher testing accuracy more quickly in classification. 展开更多
关键词 support vector machine classification pattern search Hooke and Jeeves coordinate descent global Newton algorithm.
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Utilizing partial least square and support vector machine for TBM penetration rate prediction in hard rock conditions 被引量:11
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作者 高栗 李夕兵 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期290-295,共6页
Rate of penetration(ROP) of a tunnel boring machine(TBM) in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project. The objectives of this work are to compare the accu... Rate of penetration(ROP) of a tunnel boring machine(TBM) in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project. The objectives of this work are to compare the accuracy of prediction models employing partial least squares(PLS) regression and support vector machine(SVM) regression technique for modeling the penetration rate of TBM. To develop the proposed models, the database that is composed of intact rock properties including uniaxial compressive strength(UCS), Brazilian tensile strength(BTS), and peak slope index(PSI), and also rock mass properties including distance between planes of weakness(DPW) and the alpha angle(α) are input as dependent variables and the measured ROP is chosen as an independent variable. Two hundred sets of data are collected from Queens Water Tunnel and Karaj-Tehran water transfer tunnel TBM project. The accuracy of the prediction models is measured by the coefficient of determination(R2) and root mean squares error(RMSE) between predicted and observed yield employing 10-fold cross-validation schemes. The R2 and RMSE of prediction are 0.8183 and 0.1807 for SVMR method, and 0.9999 and 0.0011 for PLS method, respectively. Comparison between the values of statistical parameters reveals the superiority of the PLSR model over SVMR one. 展开更多
关键词 tunnel boring machine(TBM) performance prediction rate of penetration(ROP) support vector machine(svm partial least squares(PLS)
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A Support Vector Machine Based on Bayesian Criterion
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作者 于传强 郭晓松 +1 位作者 王宇 王振业 《Defence Technology(防务技术)》 SCIE EI CAS 2011年第2期99-104,共6页
SVM handles classification problem only considering samples themselves and the classification effect depends on the characteristics of the training samples but not the current information of classified problem.From th... SVM handles classification problem only considering samples themselves and the classification effect depends on the characteristics of the training samples but not the current information of classified problem.From the phenomena of data crossing in systems,this paper improves the classification effect of SVM by adding the prior probability item reflecting the classified problem information into the decision function,which fuses the Bayesian criterion into SVM.The detailed deducing process and realizing steps of the algorithm are put forward.It is verified through two instances.The results showthat the new algorithm has better effect than the traditional SVM algorithm,and its robustness and sensitivity are all improved. 展开更多
关键词 mathematical statistics support vector machine Bayesian criterion classification prior probability SAMPLE
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Adaptive support vector machine decision feedback equalizer
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作者 Sumin Zhang Shu Li Donglin Su 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第3期452-461,共10页
An adaptive support vector machine decision feedback equalizer(ASVM-DFE) based on the least square support vector machine(LS-SVM) is proposed,it solves linear system iteratively with less computational intensity.A... An adaptive support vector machine decision feedback equalizer(ASVM-DFE) based on the least square support vector machine(LS-SVM) is proposed,it solves linear system iteratively with less computational intensity.An adaptive non-singleton fuzzy support vector machine decision feedback equalizer(ANSFSVMDFE) is also presented,it adopts the non-singleton fuzzy Gaussian kernel function with similar characteristic of pre-filter and is modified with a space transformation based approach.Simulations under nonlinear time variant channels show that ASVM-DFE and ANSFSVM-DFE perform very well on nonlinear equalization and ANSFSVM-DFE acts especially well in resisting abrupt interference. 展开更多
关键词 non-singleton fuzzy system support vector machine(svm EQUALIZER decision feedback.
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Support vector classification algorithm based on variable parameter linear programming
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作者 Xiao Jianhua Lin Jian 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2007年第2期355-359,共5页
To solve the problems of SVM in dealing with large sample size and asymmetric distributed samples, a support vector classification algorithm based on variable parameter linear programming is proposed. In the proposed ... To solve the problems of SVM in dealing with large sample size and asymmetric distributed samples, a support vector classification algorithm based on variable parameter linear programming is proposed. In the proposed algorithm, linear programming is employed to solve the optimization problem of classification to decrease the computation time and to reduce its complexity when compared with the original model. The adjusted punishment parameter greatly reduced the classification error resulting from asymmetric distributed samples and the detailed procedure of the proposed algorithm is given. An experiment is conducted to verify whether the proposed algorithm is suitable for asymmetric distributed samples. 展开更多
关键词 support vector machine Linear programming classification Variable parameter.
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局部密度最小不确定性的SVM样本选择算法
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作者 周玉 刘虹瑜 +2 位作者 李京京 丁红强 白磊 《哈尔滨工业大学学报》 北大核心 2025年第8期45-56,共12页
为解决支持向量机(SVM)在分类时通常含有大量的冗余样本,从而导致面对较大规模数据集时SVM计算复杂度受到限制的问题,提出一种局部密度最小不确定性的SVM样本选择算法。该方法对决策面影响较大的边界数据进行有效选择,通过提取可能含有... 为解决支持向量机(SVM)在分类时通常含有大量的冗余样本,从而导致面对较大规模数据集时SVM计算复杂度受到限制的问题,提出一种局部密度最小不确定性的SVM样本选择算法。该方法对决策面影响较大的边界数据进行有效选择,通过提取可能含有支持向量的训练样本,降低计算开销,进而提高SVM性能。首先,计算训练样本的K互近邻个数与高斯核密度估计。其次,将K互近邻个数与高斯核密度估计进行加和得到每个样本点的K局部密度并获取密度矩阵。然后,利用局部密度不确定性平衡优化方法,将密度矩阵进行三值映射后使不确定性改变量达到最小时得到最优阈值,并划分密度矩阵为中心数据与边界数据。最后,提取边界数据并作为SVM的训练样本建立分类模型。结果表明:利用该方法在UCI数据集上与其他6种常用样本选择方法进行实验对比,以准确率、保存率作为性能指标,文中提出的算法可以迅速划分中心数据与边界数据并删除大量冗余的训练样本,有效降低SVM的训练负担的同时提高了分类性能。 展开更多
关键词 支持向量机(svm) 样本选择 局部密度 不确定性平衡 分类
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基于BOA-SVM的冷源系统温度传感器偏差故障检测
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作者 周璇 闫学成 +1 位作者 闫军威 梁列全 《控制理论与应用》 北大核心 2025年第5期921-930,共10页
针对当前因温度传感器偏差故障识别率低,严重影响冷源系统节能可靠运行的问题,提出一种基于贝叶斯优化支持向量机BOA-SVM组合优化算法的偏差故障检测方法.该方法融合了贝叶斯优化算法(BOA)和支持向量机(SVM)技术,适用于小样本、非线性... 针对当前因温度传感器偏差故障识别率低,严重影响冷源系统节能可靠运行的问题,提出一种基于贝叶斯优化支持向量机BOA-SVM组合优化算法的偏差故障检测方法.该方法融合了贝叶斯优化算法(BOA)和支持向量机(SVM)技术,适用于小样本、非线性故障数据,同时克服了SVM算法对核函数参数与惩罚因子强敏感性的问题.论文建立了广州市某办公建筑冷源系统Trnsys仿真模型,对室外干球、冷冻供水与冷却进水3种温度传感器不同程度的偏差故障进行模拟.仿真结果表明,与本文提出的其他方法相比,该方法准确率高,泛化能力及鲁棒性强,能够满足冷源系统温度传感器偏差故障的检测需求,保障空调系统的安全、高效与稳定运行. 展开更多
关键词 冷源系统 温度传感器 贝叶斯优化 支持向量机 故障检测 TRNSYS
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深基坑开挖致高铁桥墩位移的SVM预测方法
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作者 宋旭明 李小龙 +2 位作者 唐冕 王天良 程丽娟 《浙江大学学报(工学版)》 北大核心 2025年第6期1233-1240,1252,共9页
为了研究邻近基坑开挖引起的高铁桥梁墩顶附加位移对铁路运营安全的影响,依托某深基坑开挖工程,建立考虑地下水影响的土体-桥梁三维有限元模型.分析高铁桥墩附加位移的单因素敏感性.采用Box-Behnken design(BBD)试验设计方法结合支持向... 为了研究邻近基坑开挖引起的高铁桥梁墩顶附加位移对铁路运营安全的影响,依托某深基坑开挖工程,建立考虑地下水影响的土体-桥梁三维有限元模型.分析高铁桥墩附加位移的单因素敏感性.采用Box-Behnken design(BBD)试验设计方法结合支持向量机算法(SVM)建立高铁桥墩墩顶位移预测模型,结合蒙特卡洛法,对参数进行107次抽样计算,得到墩顶附加位移的可靠概率.研究结果表明:基坑与高铁桥墩距离的变化对墩顶横向位移和竖向位移的影响最大.在8组不同超参数组合的SVM模型中,最优模型的预测值与有限元计算值的最大误差小于6%,最优模型可代替有限元进行计算.在墩顶横向位移为2 mm的限值下,背景工程基坑与桥墩距离为35 m时,墩顶横向附加位移的可靠概率为33.12%;当基坑与桥墩距离增加到39 m时,墩顶横向附加位移的可靠概率为99.68%.所采用的分析方法可以削减因土层力学参数离散性大而产生的评估结果不确定性,为类似工程的安全评估提供参考. 展开更多
关键词 高速铁路 深基坑 墩顶附加位移 支持向量机(svm) 可靠度
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基于SARIMA-SVM模型的季节性PM_(2.5)浓度预测
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作者 宋英华 徐亚安 张远进 《计算机工程》 北大核心 2025年第1期51-59,共9页
空气污染是城市环境治理的主要问题之一,而PM_(2.5)是影响空气质量的重要因素。针对传统时间序列预测模型对PM_(2.5)浓度预测缺少季节性因素分析,预测精度不够高的问题,提出一种基于机器学习的季节性差分自回归滑动平均-支持向量机(SARI... 空气污染是城市环境治理的主要问题之一,而PM_(2.5)是影响空气质量的重要因素。针对传统时间序列预测模型对PM_(2.5)浓度预测缺少季节性因素分析,预测精度不够高的问题,提出一种基于机器学习的季节性差分自回归滑动平均-支持向量机(SARIMA-SVM)融合模型。该融合模型为串联型融合模型,将数据拆分为线性部分与非线性部分。SARIMA模型在差分自回归滑动平均(ARIMA)模型的基础上增加了季节性因素提取参数,能有效分析PM_(2.5)浓度数据的季节性规律变化趋势,较好地预测数据未来的线性变化趋势。结合SVM模型对预测数据的残差序列进行优化,利用滑动步长预测法确定残差序列的最优预测步长,通过网格搜索确定最优模型参数,实现对PM_(2.5)浓度数据的长期预测,同时提高整体预测精度。通过对武汉市近5年的PM_(2.5)浓度监测数据进行分析,结果表明该融合模型的预测准确率相较于单一模型有很大提升,在相同的实验环境下比单一的ARIMA、Auto ARIMA、SARIMA模型分别提升了99%、99%、98%,稳定性也更好,为PM_(2.5)浓度预测研究提供了新的思路。 展开更多
关键词 季节性差分自回归滑动平均 支持向量机 融合模型 PM_(2.5)浓度 季节性预测
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