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25 July 2025, Volume 45 Issue 4

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Averaging principle for two-time-scale MSDEs driven by Poisson processes

XU Yan,GAO Peixuan

2025, 45(4):  337-342.  DOI: 10.3969/j.issn.1000-1565.2025.04.001

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This paper focuses on a class of multi-valued stochastic differential equations(MSDEs)driven by Poisson processes. By applying Itôs formula and the averaging principle, the corresponding averaged system is derived, and a quantitative comparison of their solutions is conducted. The results show that, under certain assumptions, the solution of the original system converges to that of the averaged system in the mean-square sense. This conclusion not only expands the application scope of the averaging principle in stochastic systems but also provides a new theoretical tool for the approximate analysis of multi-scale stochastic dynamical systems.

A rapid hyperspectral remote sensing classification algorithm combining improved K-PCA and PNN

JIAN Meng,CHEN Xufeng, LU Jun, HAO Minchai

2025, 45(4):  343-351.  DOI: 10.3969/j.issn.1000-1565.2025.04.002

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Hyperspectral remote sensing data can provide more abundant information about ground objects, but its high data dimension and strong redundancy also lead to low efficiency of traditional classification methods. To address this issue, this paper proposes an enhanced rapid hyperspectral remote sensing classification algorithm combining kernel-principal component analysis(K-PCA)and probabilistic neural network(PNN). Firstly, a nearest neighbor sample selection method is proposed to screen more representative ground object spectral data. Secondly, a principal component selection strategy based on half resampling is proposed to effectively remove noise and retain the essential spectral features, significantly- DOI:10.3969/j.issn.1000-1565.2025.04.002一种改进的K-PCA与PNN结合的快速高光谱遥感分类算法简萌¹,陈旭凤²,鲁军²,郝敏钗²( 1.北京工业大学 信息科学技术学院,北京 100124;2.河北工业职业技术大学 智能制造学院,河北 石家庄 050091)摘 要:高光谱遥感数据可以提供更加丰富的地物信息,但因其数据维度高、冗余性强等特点导致传统分类方法效率低下.针对此问题本文提出一种改进的核-主成分分析(kernel-principal component analysis,K-PCA)与概率神经网络(probabilistic neural network,PNN)结合的快速高光谱遥感分类算法.首先提出一种最近邻的样本选择方法,用以筛选更具代表性的地物光谱数据;其次提出一种基于半数重采样的主成分优选策略,有效去除噪声并保留光谱本质特征,大幅度降低数据维度;最后融合K-PCA的非线性降维特性与PNN的最优贝叶斯分类能力进行地物识别.在利用AVIRIS高光谱数据集的验证实验中,本算法不仅将分类精度提升至89.9%,较传统方法提升显著,且运算效率大幅提升.结果表明该算法在兼顾分类精度与实时性的高光谱地物识别场景中凸显优势,为遥感大数据智能处理提供了高效解决方案.关键词:高光谱遥感数据;地物识别;核-主成分分析;概率神经网络;半数重采样中图分类号:O433 文献标志码:A 文章编号:1000-1565(2025)04-0343-09A rapid hyperspectral remote sensing classification algorithm combining improved K-PCA and PNNJIAN Meng¹,CHEN Xufeng², LU Jun², HAO Minchai²(1.School of Information Science and Technology,Beijing University of Technology,Beijing 100124,China; 2.School of Intelligent Manufacturing, Hebei Vocational University of Industry and Technology, Shijiazhuang 050091, China)Abstract: Hyperspectral remote sensing data can provide more abundant information about ground objects, but its high data dimension and strong redundancy also lead to low efficiency of traditional classification methods. To address this issue, this paper proposes an enhanced rapid hyperspectral remote sensing classification algorithm combining kernel-principal component analysis(K-PCA)and probabilistic neural network(PNN). Firstly, a nearest neighbor sample selection method is proposed to screen more representative ground object spectral data. Secondly, a principal component selection strategy based on half resampling is proposed to effectively remove noise and retain the essential spectral features, significantly- 收稿日期:2024-09-11;修回日期:2025-05-06 基金项目:中央引导地方科技发展资金项目(216Z1004G);河北省高校硬质合金切削材料应用技术研发中心基金;河北工业职业技术大学博士基金项目(bz202205) 第一作者:简萌(1987—),女,蒙古族,北京工业大学教授,博士,主要从事数据挖掘、多媒体计算研究.E-mail:jianmeng648@163.com 通信作者:陈旭凤(1991—),女,河北工业职业技术大学讲师,主要从事深度学习技术研究.E-mail:xufengchen_gyznzz@163.com 第4期简萌等:一种改进的K-PCA与PNN结合的快速高光谱遥感分类算法河北大学学报(自然科学版) 第45卷reducing the data dimension. Finally, by integrating the nonlinear dimensionality reduction characteristics of K-PCA and the optimal Bayesian classification ability of PNN, in the verification experiment using the AVIRIS hyperspectral dataset, the algorithm not only improves the classification accuracy to 89.9%, a significant improvement over traditional methods, but also greatly enhances the operational efficiency. Experiments show that this algorithm demonstrates outstanding advantages in hyperspectral ground object recognition scenarios where both classification accuracy and real-time performance need to be considered, providing an efficient solution for intelligent processing of remote sensing big data.

Bending performance of precast segmental beams with external pressed tendons and joint dovetail connection

YUAN Aimin,YU Jinghao, LI Weisheng, HOU Da, CHEN Qi, WANG Xi

2025, 45(4):  352-360.  DOI: 10.3969/j.issn.1000-1565.2025.04.003

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Aiming at the structural characteristics of externally prestressed precast segmental beams disconnected at the joints, the dovetail joint connection of local joints of this kind of beams is put forward,and the study on bending performance of the external prestressed precast segmental test beam connected by the dovetail is carried out. Observing the test phenomenon, summarizing the damage mode, analyzing the load-deflection curve, prestress change curve and the change rule of joint opening width along the beam height, it reveals the damage mechanism of the dovetail joint structure design of externally prestressed precast segmental beams. The results show that the precast segmental beam with joint connection has good ductility, which increases the strength of the precast segmental beam and achieves the characteristics of multi-stage failure; In the ultimate bearing capacity state, dovetail joint connection improves the resistance strength of the compression zone at joints, and the ultimate bearing capacity of beams is greater; The joint width at the open joint is linearly distributed along the beam height, and the average strain conforms to the assumption of flat section;The finite element model of externally prestressed precast segmental beam with joint dovetail connection is established and compared with the actual test. The numerical simulation results are in good agreement with the test results. - DOI:10.3969/j.issn.1000-1565.2025.04.003燕尾榫连接接缝的体外预应力预制节段梁受弯性能袁爱民¹,余京浩¹,李维生²,侯达¹,陈琦¹,王玺¹(1.河海大学 土木与交通学院, 江苏 南京 210098;2.中交第二公路工程局有限公司, 陕西 西安 710065)摘 要:针对体外预应力预制节段梁在接缝处断开导致的结构性能退化问题,提出了此类梁接缝局部连接的燕尾榫连接构造设计,并对燕尾榫连接的体外预应力预制节段试验梁进行了受弯性能试验研究.观察试验现象,总结破坏模式,分析荷载挠度曲线,预应力变化曲线以及接缝张开宽度沿梁高变化规律,揭示了燕尾榫连接构造设计体外预应力节段梁的破坏机理.研究结果表明:设置燕尾榫接缝连接方式的预制节段梁具有良好的延性,增加了预制节段梁的强度,具有多级破坏的特征;极限承载力状态时,燕尾榫连接提高了接缝处受压区抵抗强度,梁体极限承载力更大;张开接缝处的接缝宽度沿梁高呈线性分布,虚拟平均应变符合平截面假定;建立了接缝燕尾榫连接的体外预应力预制节段梁的有限元模型,并与试验进行了对比,数值模拟结果与试验结果符合较好.关键词:预制节段梁;接缝局部连接;体外预应力束;破坏模式;极限承载力中图分类号:U433.35 文献标志码:A 文章编号:1000-1565(2025)04-0352-09Bending performance of precast segmental beams with external pressed tendons and joint dovetail connectionYUAN Aimin¹,YU Jinghao¹, LI Weisheng², HOU Da¹, CHEN Qi¹, WANG Xi¹(1. School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;2. CCCC Second Highway Engineering Co., Ltd., Xian 710065, China )Abstract: Aiming at the structural characteristics of externally prestressed precast segmental beams disconnected at the joints, the dovetail joint connection of local joints of this kind of beams is put forward,and the study on bending performance of the external prestressed precast segmental test beam connected by the dovetail is carried out. Observing the test phenomenon, summarizing the damage mode, analyzing the load-deflection curve, prestress change curve and the change rule of joint opening width along the beam height, it reveals the damage mechanism of the dovetail joint structure design of externally prestressed precast segmental beams. The results show that the precast segmental beam with joint connection has good ductility, which increases the strength of the precast segmental beam and achieves the characteristics of multi-stage failure; In the ultimate bearing capacity state, dovetail joint connection improves the resistance strength of the compression zone at joints, and the ultimate bearing capacity of beams is greater; The joint width at the open joint is linearly distributed along the beam height, and the average strain conforms to the assumption of flat section;The finite element model of externally prestressed precast segmental beam with joint dovetail connection is established and compared with the actual test. The numerical simulation results are in good agreement with the test results. - 收稿日期:2024-05-02;修回日期:2024-09-18 基金项目:国家自然科学基金项目(51878250);江苏省研究生科研创新计划项目(KYCX23_0698) 第一作者:袁爱民(1974—),男,河海大学教授,博士,主要从事桥梁工业化智能建造技术与理论研究.E-mail:yuanam@163.com第4期袁爱民等:燕尾榫连接接缝的体外预应力预制节段梁受弯性能河北大学学报(自然科学版) 第45卷

Microwave synthesis and optical temperature sensing properties of red phosphors Na₃La(VO₄)₂:Eu³⁺

LI Zixuan, CHEN Jinrun, DI Zimeng, WANG Tengyue, CHENG Feiyang, ZHAI Yongqing

2025, 45(4):  361-371.  DOI: 10.3969/j.issn.1000-1565.2025.04.004

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A series of Na₃La_1-x(VO₄)₂:xEu³⁺(0<x≤0.40)red phosphors were synthesized by microwave radiation method. The effects of microwave reaction time and Eu³⁺ concentration on the structure, morphology and luminescence properties of the phosphors were investigated. The results show that the pure phase of orthorhombic Na₃La(VO₄)₂:Eu³⁺ with high crystallinity can be synthesized by selecting MnO₂ as the microwave absorbent, microwave power of about 560 W and reaction time of 15~30 min. The micromorphology of the sample is irregular, the particle size is in the level of micron, and the size increases gradually with the extension of reaction time. The main excitation peak of Na₃La(VO₄)₂: Eu³⁺ is located at 320 nm, and the strongest emission peak is located at 620 nm, showing red emission. When the microwave reaction time is 20 min, the intensity of the main emission peak reaches the maximum.- DOI:10.3969/j.issn.1000-1565.2025.04.004红色荧光粉Na₃La(VO₄)₂:Eu³⁺的微波合成及光学温度传感性能李子璇,陈金润,邸紫萌,王腾越,程飞扬,翟永清(河北大学 化学与材料科学学院,河北 保定 071002)摘 要:采用微波法合成了Na₃La_1-x(VO₄)₂:xEu³⁺(0<x≤0.40)系列红色荧光粉,探讨了微波反应时间、Eu³⁺浓度等对荧光粉的结构、形貌和发光性质的影响.结果表明:以MnO₂为微波吸收剂,微波功率约为560 W,中高火,反应时间为15~30 min,可合成正交晶系Na₃La(VO₄)₂:Eu³⁺的纯相,且结晶良好.样品的微观形貌呈不规则块状,尺寸为微米级,且随着反应时间的延长,粒径逐渐增大.Na₃La(VO₄):Eu³⁺主激发峰位于320 nm处,最强发射峰位于620 nm处,呈红光发射.微波反应20 min时,主发射峰强度最大.随着Eu³⁺浓度不断增加,样品的主发射峰强度呈先增强后减弱的趋势,当Eu³⁺摩尔分数x为0.32时,强度达到最大,此后逐渐减弱,主要由电偶极-电四极相互作用引起.Na₃La_0.68(VO₄)₂:0.32Eu³⁺在不同温度下的发射光谱显示,在473 K温度下,样品主发射峰强度约为室温时的68%,说明样品具有良好的热稳定性.基于Eu³⁺在538 nm(⁵D₁→⁷F₁)和594 nm(⁵D₀→⁷F₁)的荧光强度比,计算出样品的最大绝对灵敏度S_a和最大相对灵敏度S_r分别为1.23×10^-3/K和2.94%/K,表现出良好的温度传感特性.关键词:钒酸盐;微波法;红色荧光粉;白光LED;光学温度传感中图分类号:O611;O614 文献标志码:A 文章编号:1000-1565(2025)04-0361-11Microwave synthesis and optical temperature sensing properties of red phosphors Na₃La(VO₄)₂:Eu³⁺LI Zixuan, CHEN Jinrun, DI Zimeng, WANG Tengyue, CHENG Feiyang, ZHAI Yongqing( College of Chemistry and Materials Science, Hebei University, Baoding 071002, China)Abstract: A series of Na₃La_1-x(VO₄)₂:xEu³⁺(0<x≤0.40)red phosphors were synthesized by microwave radiation method. The effects of microwave reaction time and Eu³⁺ concentration on the structure, morphology and luminescence properties of the phosphors were investigated. The results show that the pure phase of orthorhombic Na₃La(VO₄)₂:Eu³⁺ with high crystallinity can be synthesized by selecting MnO₂ as the microwave absorbent, microwave power of about 560 W and reaction time of 15~30 min. The micromorphology of the sample is irregular, the particle size is in the level of micron, and the size increases gradually with the extension of reaction time. The main excitation peak of Na₃La(VO₄)₂: Eu³⁺ is located at 320 nm, and the strongest emission peak is located at 620 nm, showing red emission. When the microwave reaction time is 20 min, the intensity of the main emission peak reaches the maximum.- 收稿日期:2025-01-10;修回日期:2025-02-06 基金项目:国家自然科学基金项目(22175052);中央引导地方科技发展资金项目(246Z7759G);国家级大学生创新创业训练计划项目(DC2024391;202410075039) 第一作者:李子璇(1998—),女,河北大学在读硕士研究生,主要从事稀土掺杂钒酸盐发光材料的研究.E-mail:likeyzixuan@163.com 通信作者:翟永清(1970—),女,河北大学教授,博士,主要从事稀土发光材料的研究.E-mail:zhaiyongqinghbu@163.com 第4期李子璇等:红色荧光粉Na₃La(VO₄)₂:Eu³⁺的微波合成及光学温度传感性能河北大学学报(自然科学版) 第45卷Increase of Eu³⁺ concentration results in the increase of main emission peak intensity of the sample, followed by the gradual decrease. The highest intensity is achieved at the Eu³⁺ concentration x of 0.32. This is attributed to the electric dipole-electric quadrupole interactions. The emission spectra of Na₃La_0.68(VO₄)₂:0.32Eu³⁺ recorded at different temperatures show that the main emission peak intensity of the sample at 473 K is about 68% of that at room temperature, indicating that the sample has good thermal stability. Based on the fluorescence intensity ratio of Eu³⁺ at 538 nm(⁵D₁→⁷F₁)and 594 nm(⁵D₀→⁷F₁), the maximum absolute sensitivity S_a and relative sensitivity S_r of the sample were calculated to be 1.23×10^-3/K and 2.94%/K, respectively, showing good temperature sensing characteristics.

Detection of erythritol based on inhibition of luminol-artemisinin chemiluminescence

LI Xianrui,WANG Beibei, SUN Yingying, LI Jia

2025, 45(4):  372-377.  DOI: 10.3969/j.issn.1000-1565.2025.04.005

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Under the catalytic action of hemin, artemisinin can oxidize luminol to produce luminescence. Erythritol has a significant inhibitory effect on the luminous intensity of the system, and the decreased value of light signal has a linear relationship with the erythritol’s concentration. Based on this principle, a new method to measure erythritol was developed. Under optimum test condition, the linear range of this method is 0.028~2.0 mg/mL(R² =0.997 8), and the detection limit of this method is 1.6×10^-2 mg/mL. The standard deviation is 3.2% after measuring 0.50 mg/mL erythritol eleven times continuously.

Research progress on application, preparation process and quality standard of cerebroprotein hydrolysates

TAN Zhilei, GENG Xue, SHENG Zihan, JIN Xingyu, XU Feng, LI Jinhong

2025, 45(4):  378-388.  DOI: 10.3969/j.issn.1000-1565.2025.04.006

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Cerebroprotein hydrolysate is a mixture of polypeptides and amino acids obtained from porcine brain after enzymatic hydrolysis and filtration. Cerebroprotein hydrolysate can exert neurotrophic activity on neurons in the peripheral or central nervous system, and has a good effect in the adjuvant treatment of various neurodegenerative diseases. This review mainly introduced the application, preparation process and quality standards of cerebroprotein hydrolysate, which provided a reference for further improving the production process of cerebroprotein hydrolysate and developing new oral products.

Study on the promotion of invasiveness of pituitary adenoma cells by activating EMT through S100A4

ZHAO Pengfei,WANG Jialiang,WANG Yan,BAI Zetong,SUN Chengyuan,LIU Chao,LIU Haipeng

2025, 45(4):  389-397.  DOI: 10.3969/j.issn.1000-1565.2025.04.007

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S100A4 protein is a calcium binding protein involved in angiogenesis, cell differentiation, apoptosis, and autophagy processes. In order to study the expression of S100A4 in pituitary adenomas and further explore its mechanism in promoting the invasive nature of pituitary adenoma cells, the expression of S100A4 in invasive and non-invasive pituitary adenoma tissues was detected through immunohistochemical techniques. A pituitary adenoma cell line with stable overexpression of S100A4 was obtained by transfection technology. Scratch assay and Transwell assay were employed to respectively detect the changes in cell migration and invasion capabilities. RT-PCR and Western blot methods were used- DOI:10.3969/j.issn.1000-1565.2025.04.007S100A4启动EMT促进垂体腺瘤细胞的侵袭性研究赵鹏飞,王佳良,王岩,白泽通,孙程圆,刘超,刘海鹏(河北大学附属医院 神经外科,河北 保定 071000)摘 要:S100A4 蛋白是一种钙结合蛋白,参与血管生成、细胞分化、细胞凋亡和自噬过程.为了研究S100A4在垂体腺瘤中的表达情况,并进一步探索其在促进垂体腺瘤细胞侵袭性中的作用机制,通过免疫组化技术检测S100A4在侵袭性垂体腺瘤组织和非侵袭性垂体腺瘤组织中的表达情况,采用转染技术获得稳定过表达S100A4的垂体腺瘤细胞系,采用划痕实验和Transwell实验分别检测细胞的迁移和侵袭能力的变化,采用RT-PCR和Western blot法检测细胞中EMT标志物的表达情况,通过免疫组化技术检测EMT标志物在非侵袭性及侵袭性垂体腺瘤组织中的表达情况.结果显示:在侵袭性垂体腺瘤组织中,S100A4高表达,E-cadherin低表达,N-cadherin和Vimentin高表达,而在非侵袭性垂体腺瘤组织中分子表达情况相反;过表达S100A4可显著促进垂体腺瘤细胞的迁移和侵袭能力,过表达S100A4可显著下调垂体腺瘤细胞中E-cadherin的mRNA和蛋白表达水平,显著上调N-cadherin、Vimentin的mRNA和蛋白表达水平.综上,S100A4在垂体腺瘤细胞中的过表达可通过促进EMT进程,提高细胞迁移和侵袭的能力,表明S100A4可能是治疗垂体腺瘤侵袭性生长的新靶点.关键词:S100A4;垂体腺瘤;EMT;迁移;侵袭中图分类号:R739.4 文献标志码:A 文章编号:1000-1565(2025)04-0389-09Study on the promotion of invasiveness of pituitary adenoma cells by activating EMT through S100A4ZHAO Pengfei,WANG Jialiang,WANG Yan,BAI Zetong,SUN Chengyuan,LIU Chao,LIU Haipeng(Department of Neurosurgery, Affiliated Hospital of Hebei University, Baoding 071000,China)Abstract: S100A4 protein is a calcium binding protein involved in angiogenesis, cell differentiation, apoptosis, and autophagy processes. In order to study the expression of S100A4 in pituitary adenomas and further explore its mechanism in promoting the invasive nature of pituitary adenoma cells, the expression of S100A4 in invasive and non-invasive pituitary adenoma tissues was detected through immunohistochemical techniques. A pituitary adenoma cell line with stable overexpression of S100A4 was obtained by transfection technology. Scratch assay and Transwell assay were employed to respectively detect the changes in cell migration and invasion capabilities. RT-PCR and Western blot methods were used- 收稿日期:2024-10-28;修回日期:2024-12-26 基金项目:河北省医学科学研究课题计划项目(20220625;20220626);河北大学附属医院基金项目(2022QC79;2022QC56) 第一作者:赵鹏飞(1989—),男,河北大学附属医院主治医师,主要从事中枢神经系统肿瘤的临床和基础研究.E-mail:zpf03539@126.com 通信作者:刘海鹏(1980—),男,河北大学附属医院副主任医师,主要从事中枢神经系统肿瘤的临床和基础研究.E-mail:lhp01116@163.com 第4期赵鹏飞等:S100A4启动EMT促进垂体腺瘤细胞的侵袭性研究河北大学学报(自然科学版) 第45卷to detect the expression of EMT markers in cells. The expression of EMT markers in non-invasive and invasive pituitary adenoma tissues was examined by immunohistochemical techniques. The results indicated that in invasive pituitary adenoma tissues, S100A4 was highly expressed, E-cadherin was lowly expressed, and N-cadherin and Vimentin were highly expressed. In non-invasive pituitary adenoma tissues, the molecular expressions were the opposite. Overexpression of S100A4 significantly promoted the migration and invasion abilities of pituitary adenoma cells. Overexpression of S100A4 significantly downregulated the mRNA and protein expression levels of E-cadherin in pituitary adenoma cells and significantly upregulated the mRNA and protein expression levels of N-cadherin and Vimentin. In conclusion, the overexpression of S100A4 in pituitary adenoma cells can enhance migration and invasion ability by promoting the EMT process, suggesting that S100A4 may be a new target for treating aggressive growth of pituitary adenoma.

Brain tumor image segmentation algorithm based on an improved UNet ++ model

FU Hao, ZHANG Zhenli, CHEN Yuan

2025, 45(4):  398-407.  DOI: 10.3969/j.issn.1000-1565.2025.04.008

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Aiming at the problems of blurred edge segmentation and low segmentation accuracy of computer-aided brain tumor images, an improved nested UNet++ brain tumor image segmentation algorithm was proposed. Firstly, the MCAM module is designed to replace the feature extraction part of the original UNet++. The CA attention mechanism is used to focus on position information in different directions to improve feature extraction capabilities. The Mish activation function is used to replace the ReLU activation function to prevent gradient disappearance and improve segmentation. accuracy and generalization ability; then add the SME module after feature extraction for squeezing and excitation to enhance the receptive field of the feature map to enhance the learning ability of tumor features; finally, use the focus Dice loss function to focus on fuzzy samples segmentation, thereby improving the problem of blurred- DOI:10.3969/j.issn.1000-1565.2025.04.008改进UNet++模型的脑肿瘤图像分割算法付豪,张振利,陈源(江西理工大学 电气工程与自动化学院,江西 赣州 341000)摘 要:针对计算机辅助脑肿瘤图像边缘分割模糊、分割精度不高的问题,提出了一种改进的嵌套UNet++脑肿瘤图像分割算法.首先,设计MCAM(Mish coordinate attention module)模块代替原UNet++的特征提取部分,嵌入坐标注意力机制(coordinate attention,CA)关注不同方向上的位置信息以增强特征提取能力,使用Mish激活函数替换ReLU激活函数防止出现梯度消失,提高脑肿瘤图像分割精度和泛化能力;其次,在特征提取后加入SME(squeeze Mish excitation)模块进行挤压和激励,扩大特征图的感受野以增强对肿瘤特征的学习能力;最后,利用焦点Dice损失函数关注模糊样本的分割,从而改善脑肿瘤图像边缘分割模糊的问题.提出的算法在Figshare数据集上进行仿真实验,实验结果表明,在均值交并比(MIoU)、类别平均像素准确率(MPA)、骰子系数(Dice)和豪斯多夫距离(Hausdorff distance,HD)评估指标上分别达到83.26%、81.91%、86.45%和18.57 mm.与3DUNet、Swin-UNet、DD-UNet、LRAE-UNet和AI-UNet等算法进行对比,证明提出的算法分割效果更优.关键词:脑肿瘤图像分割;UNet++;MCAM;CA注意力机制;Mish激活函数;SME;焦点Dice损失函数中图分类号:TP391.41 文献标志码:A 文章编号:1000-1565(2025)04-0398-10Brain tumor image segmentation algorithm based on an improved UNet ++ modelFU Hao, ZHANG Zhenli, CHEN Yuan(School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou 341000, China)Abstract: Aiming at the problems of blurred edge segmentation and low segmentation accuracy of computer-aided brain tumor images, an improved nested UNet++ brain tumor image segmentation algorithm was proposed. Firstly, the MCAM module is designed to replace the feature extraction part of the original UNet++. The CA attention mechanism is used to focus on position information in different directions to improve feature extraction capabilities. The Mish activation function is used to replace the ReLU activation function to prevent gradient disappearance and improve segmentation. accuracy and generalization ability; then add the SME module after feature extraction for squeezing and excitation to enhance the receptive field of the feature map to enhance the learning ability of tumor features; finally, use the focus Dice loss function to focus on fuzzy samples segmentation, thereby improving the problem of blurred- 收稿日期:2024-10-17;修回日期:2025-04-27 基金项目:国家自然科学基金项目(62363013) 第一作者:付豪(2000—),男,江西理工大学在读硕士研究生,主要从事计算机医学图像处理方向研究.E-mail:1324940506@qq.com 通信作者:张振利(1976—),男,江西理工大学副教授,主要从事人工智能、检测技术与控制方向研究.E-mail:47717770@qq.com第4期付豪等:改进UNet++模型的脑肿瘤图像分割算法河北大学学报(自然科学版) 第45卷edge segmentation of brain tumor images. The proposed algorithm was simulated on the Figshare dataset. The experimental results showed that it achieved 83.26%, 81.91%, 86.45% and 18.57mm in MIoU, MPA, Dice and Hausdorff evaluation indicators respectively. Comparison with algorithms such as 3DUnet, Swin-UNet, DD-UNet, LRAE-UNet and AI-UNet proves that the proposed algorithm has better segmentation effect.

Lightweight polyp image segmentation based on parallel Mamba

JIA Chengfu, SUN Xiaochuan, JIA Jinghao, CHEN Weibin, LI Yingqi

2025, 45(4):  408-418.  DOI: 10.3969/j.issn.1000-1565.2025.04.009

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To address the challenge of balancing segmentation accuracy and complexity in existing segmentation methods, a novel lightweight colorectal polyp image segmentation network, MCANet(Mamba and convolutional attention network), is proposed. The core of this network lies in a multiscale convolutional attention module cascading spatial and channel attention by fusing multiscale features in order to reduce the gap between shallow and deep features. In addition, a parallel Mamba module is introduced to improve the computational efficiency by utilizing parallelized computation. Experimental results on three public datasets show that the proposed method outperforms other state-of-the-art methods in terms of effectiveness and generalization, enabling it to pinpoint the abnormal portions in the colorectum and provide clinicians with critical decision support, which reduces the risk of polyp cancer.

Super resolution reconstruction of X-ray image based on light residual attention network

YANG Kun, QI Chaoyi, LIU Tianjun, AI Shangpu, YAN Senguang, LIU Xiuling, XUE Linyan

2025, 45(4):  419-430.  DOI: 10.3969/j.issn.1000-1565.2025.04.010

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In response to the problem that most current medical image super-resolution reconstruction algorithms are complex and have a large number of parameters, a new lightweight deep residual medical image super-resolution network LDRAN was proposed. By designing a lightweight and efficient residual block LDRB, more convolutional layers are used to extract image information without increasing the number- DOI:10.3969/j.issn.1000-1565.2025.04.010针对X线图像超分辨率重建的轻量残差注意力网络杨昆^1,2,3,齐晁仪⁴,刘天军⁴,艾尚璞¹,闫森广¹,刘秀玲^4,5,薛林雁^1,2,3(1.河北大学 质量技术监督学院,河北 保定 071002;2.计量仪器与系统国家地方联合工程研究中心,河北 保定 071002;3.河北省新能源汽车动力系统轻量化技术创新中心,河北 保定 071002;4.河北大学 电子信息工程学院,河北 保定 071002;5.河北省数字医疗工程重点实验室,河北 保定 071002)摘 要:针对当前医学图像超分辨率重建算法复杂、参数量大等问题,提出了轻量化的X线医学图像超分辨率网络LDRAN(lightweight deep residual attention network).该方法设计了轻量且高效的残差块 LDRB(lightweight deep residual block),在保证参数量不增加的条件下,通过增设卷积层来提取更为丰富的图像特征.为进一步提高卷积层间的信息传递效率,设计了一种新颖的残差级联方案IRSC(improved residual skip concatenation).同时,为应对医学影像中信噪比低的问题,构建了多维混合注意力机制模块CSPMA(channel-spatial-pixel mixed attention),该模块分别从通道、空间和像素3个维度筛选信息,从而显著增强了网络对关键图像特征的捕捉能力.实验结果表明,LDRAN在X线医学图像数据集Chest X-ray上的PSNR为36.81 dB,SSIM为0.896 6,均取得了最优.并且能够更好地重建X线图像的细节和纹理.此外,LDRAN在3个自然图像数据集上的重建效果比多数具有代表性的算法更好.关键词:超分辨重建;轻量化;深度残差块;混合多维度注意力模块;残差级联中图分类号:TP391 文献标志码:A 文章编号:1000-1565(2025)04-0419-12Super resolution reconstruction of X-ray image based on light residual attention networkYANG Kun^1,2,3, QI Chaoyi⁴, LIU Tianjun⁴, AI Shangpu¹, YAN Senguang¹, LIU Xiuling^4,5, XUE Linyan^1,2,3(1. College of Quality and Technical Supervision, Hebei University, Baoding 071002, China;2. National & Local Joint Engineering Research Center of Metrology Instrument and System, Baoding 071002, China;3. Innovation Center for Lightweight of New Energy Vehicle Power System of Hebei, Baoding 071002, China;4. College of Electronic and Information Engineering, Hebei University, Baoding 071002, China;5. Key Laboratory of Digital Medical Engineering of Hebei Province, Baoding 071002, China)Abstract: In response to the problem that most current medical image super-resolution reconstruction algorithms are complex and have a large number of parameters, a new lightweight deep residual medical image super-resolution network LDRAN was proposed. By designing a lightweight and efficient residual block LDRB, more convolutional layers are used to extract image information without increasing the number- 收稿日期:2024-11-21;修回日期:2025-03-18 基金项目:河北省自然科学基金项目(F2022201037);河北大学科研创新团队项目(IT2023B07) 第一作者:杨昆(1976—),男,河北大学教授,博士生导师,主要从事生物医学图像处理方向研究.E-mail: yangkun@hbu.edu.cn 通信作者:薛林雁(1981—),女,河北大学教授,主要从事生物医学图像处理方向研究.E-mail:lyxue@hbu.edu.cn 第4期杨昆等:针对X线图像超分辨率重建的轻量残差注意力网络河北大学学报(自然科学版) 第45卷of parameters, and a new residual cascade method IRSC(improved residual skip concatenation)is designed to improve the information utilization among convolutional layers. In addition, to solve the problem of small percentage of useful information in medical images, the improved mixed multidimensional attention module CSPMA(channel-spatial-pixel mixed attention)is designed to filter information from three dimensions: channel, spatial and pixel, and is used to improve the networks attention to useful information in images. The experimental results show that LDRAN achieves the best PSNR(36.81 dB)and SSIM(0.8966)on the X-ray medical image dataset Chest X-ray and can better reconstruct the details and textures of X-ray images. Additionally, LDRAN outperforms most representative reconstruction algorithm on three natural image datasets.

Design and simulation of a new drag type wire end clamp

ZHU Chenghao, PIAO Tiangao, CAO Liang, HU Kelei, ZHANG Chenqi, LI Jindi, HUA Guangru

2025, 45(4):  431-438.  DOI: 10.3969/j.issn.1000-1565.2025.04.011

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With pespect to the low efficiency and risk of high-altitude falling for operators to repeatedly climb poles to install and remove grounding wires for maintenance of overhead distribution lines, a new drag type wire end clamp is proposed and designed. This clamp allows personnel to install and remove grounding wires by dragging them on the ground. The clamp is connected to an insulation rope that spans the grounding position. By pulling the rope downwards at the other end of the insulation rope, the clamp can be dragged to carry the grounding wire up and smoothly clamp the grounding position. By dragging the controlling rope to release the compression spring, the clamp can be tightly connected to the grounding position. When the maintenance is completed and the clamp needs to be removed, simply drag the other insulated rope on the clamp to detach it from the grounding position and retrieve it on the ground. In order to verify that the new type of wire clamp can safely and reliably clamp the grounding position under normal power outage and unexpected sudden power on situations, simulation research and experiments were conducted from three aspects: clamping force of the wire clamp, short-circuit current electrodynamic force,- DOI:10.3969/j.issn.1000-1565.2025.04.011新型拖拽式导线端线夹设计与仿真朱成昊¹,朴天高¹,曹亮¹,户克磊¹,张辰琪¹,李金迪¹,花广如²(1. 国网北京市电力公司 大兴供电公司,北京 102600;2. 华北电力大学 河北省电力机械装备健康维护与失效预防重点实验室,河北 保定 071003)摘 要:针对检修架空配电线路时常需操作人员反复登杆高空作业装拆接地线存在的效率较低和高空坠落风险问题,提出并设计了一种人员在地面通过拖拽方式即可完成短路接地线安装和拆卸的新型拖拽式导线端线夹.该线夹通过与跨越接地位置的绝缘绳连接,在绝缘绳的另一端向下拉绳,即可拖拽线夹携带短路接地线上升并顺利卡住接地位置,通过控制绳释放压缩弹簧,使得线夹夹紧接地位置.检修完成需要拆卸该线夹时,只需要在地面拖拽线夹上的另一根绝缘绳即可让线夹脱离接地位置并回收.为了检验新型线夹能够在正常断电和意外突然通电情况下均能安全可靠夹紧接地位置,从线夹的夹紧力、短路电流电动力、电流的热效应3个方面进行仿真研究及实验,结果表明,3方面的参数均在线夹的安全范围内,为设计此类新型线夹和安全使用提供了可靠的理论依据.关键词:导线端线夹;拖拽式;夹紧力;电动力;电流热效应;仿真中图分类号:TH122;TM726 文献标志码:A 文章编号:1000-1565(2025)04-0431-08Design and simulation of a new drag type wire end clampZHU Chenghao¹, PIAO Tiangao¹, CAO Liang¹, HU Kelei¹, ZHANG Chenqi¹, LI Jindi¹, HUA Guangru²(1.Daxing Power Supply Company,State Grid Beijing Electric Power Company, Beijing 102600,China;2. Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention,North China Electric Power University, Baoding 071003,China)Abstract: With pespect to the low efficiency and risk of high-altitude falling for operators to repeatedly climb poles to install and remove grounding wires for maintenance of overhead distribution lines, a new drag type wire end clamp is proposed and designed. This clamp allows personnel to install and remove grounding wires by dragging them on the ground. The clamp is connected to an insulation rope that spans the grounding position. By pulling the rope downwards at the other end of the insulation rope, the clamp can be dragged to carry the grounding wire up and smoothly clamp the grounding position. By dragging the controlling rope to release the compression spring, the clamp can be tightly connected to the grounding position. When the maintenance is completed and the clamp needs to be removed, simply drag the other insulated rope on the clamp to detach it from the grounding position and retrieve it on the ground. In order to verify that the new type of wire clamp can safely and reliably clamp the grounding position under normal power outage and unexpected sudden power on situations, simulation research and experiments were conducted from three aspects: clamping force of the wire clamp, short-circuit current electrodynamic force,- 收稿日期:2025-03-24;修回日期:2025-04-18 基金项目:国网北京市电力公司科技项目(520212230006) 第一作者:朱成昊(1990—),男,国网北京市电力公司工程师,主要从事电力电子技术研究. E-mail: jerry19901028@126.com 通信作者:花广如(1971—),男,华北电力大学教授,博士,主要从事电力特种机器人研究.E-mail: huagr2007@163.com 第4期朱成昊等:新型拖拽式导线端线夹设计与仿真河北大学学报(自然科学版) 第45卷and current thermal effect. The results showed that all three parameters were within the safe range of the wire clamp, providing a reliable theoretical basis for the design and safe use of such new wire clamps.

Fault-tolerant control of asynchronous motor multi-current sensor based on SVPWM

LI Xiaobo, FENG Qiufeng, SHI Shangxian, LIU Xinyi

2025, 45(4):  439-448.  DOI: 10.3969/j.issn.1000-1565.2025.04.012

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Aiming at current sensor fault affecting the normal operation of the electric drive system, a new fault detection and fault-tolerant control method of multi-current sensor was proposed. Firstly, based on the vector control principle of induction motor, the judgment functions Z_i and P_i were introduced and hysteresis comparator was set up. A fault detection method for single and multiple current sensors was designed based on the output results of the comparator. Then, according to the space vector pulse width modulation(SVPWM)principle and the relationship between DC bus voltage and sector voltage, the fault tolerant control of the fault phase current sensor was carried out. Finally, the method were verified and comparative analysis by MATLAB software was performed. The results show that the proposed method is feasible for the multi-sensor fault-tolerant control of asynchronous motor. It has strong localization ability and high accuracy for fault phases, and it is superior to the traditional sliding mode observer scheme and the ideal motor model with extended Kalman filter scheme in terms of three-phase current reconstruction. The fault tolerant reduction rate after reconstruction reaches 95.4% of the normal working condition, and it has better control effect.