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基于门控机制与重放策略的持续语义分割方法

电子与信息学报 2024年第7期46卷 2908-2917页

作者：杨静何瑶李斌李少波胡建军溥江贵州大学机械工程学院贵阳550025 贵州大学公共大数据国家重点实验室贵阳550025 美国南卡罗莱纳州大学计算机科学与工程系哥伦比亚292084 贵州民族大学机械电子工程学院贵阳550025

基于深度神经网络的语义分割模型在增量更新知识时由于新旧任务参数之间的干扰加之背景漂移现象,会加剧灾难性遗忘。此外,数据常常由于隐私、安全等因素无法被存储导致模型失效。为此,该文提出基于门控机制与重放策略的持续语义分割方... 详细信息

基于深度神经网络的语义分割模型在增量更新知识时由于新旧任务参数之间的干扰加之背景漂移现象,会加剧灾难性遗忘。此外,数据常常由于隐私、安全等因素无法被存储导致模型失效。为此,该文提出基于门控机制与重放策略的持续语义分割方法。首先,在不存储旧数据的情况下,通过生成对抗网络生成及网页抓取作为数据来源,使用标签评估模块解决无监督问题、背景自绘模块解决背景漂移问题;接着,使用重放策略缓解灾难性遗忘;最后,将门控变量作为一种正则化手段增加模型稀疏性,研究了门控变量与持续学习重放策略结合的特殊情况。在Pascal VOC2012数据集上的评估结果表明,在复杂场景10-2,生成对抗网络(GAN)、Web的设置中,该文在全部增量步骤结束后的旧任务性能比基线分别提升了3.8%,3.7%,在场景10-1中,相比于基线分别提升了2.7%,1.3%。

关键词：持续学习语义分割重放策略门控变量

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胸腔镜肺癌根治术后肺部感染易感因素及miR-31、miR-122、miR-146a表达水平

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中华医院感染学杂志 2024年第1期34卷 50-54页

作者：马伟王世平王代平陈涛蒲江涛西南医科大学附属医院胸外科四川泸州646000 简阳市人民医院胸外科四川简阳641400 简阳市人民医院实验医学科四川简阳641400

目的探讨患者胸腔镜肺癌根治术后肺部感染易感因素及微小核糖核酸(miR)-31、miR-122、miR-146a表达水平变化。方法选取171例2018年01月-2022年12月于简阳市人民医院行胸腔镜肺癌根治术患者为研究对象,根据患者术后是否发生肺部感染分为... 详细信息

目的探讨患者胸腔镜肺癌根治术后肺部感染易感因素及微小核糖核酸(miR)-31、miR-122、miR-146a表达水平变化。方法选取171例2018年01月-2022年12月于简阳市人民医院行胸腔镜肺癌根治术患者为研究对象,根据患者术后是否发生肺部感染分为感染组34例和非感染组137例,分析肺部感染患者病原学特点、易感因素及外周血miR-31、miR-122、miR-146a表达水平。结果171例患者胸腔镜肺癌根治术后肺部感染为34例,发生率为19.88%;共培养出病原菌35株,其中革兰阴性菌27株,占77.14%;易感因素包括年龄>60岁、有吸烟史及糖尿病(P60岁、有吸烟史、有糖尿病,miR-31、miR-122、miR-146a三者联合检测可提高对该病的诊断价值,临床可进行针对性防治以降低该病发生风险。

关键词：胸腔镜肺癌根治术肺部感染病原学微小RNA-31 微小RNA-122 微小RNA-146a 易感因素诊断价值

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Discussion of 90°stopband in low-energy superconducting linear accelerators

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Nuclear Science and Techniques 2022年第9期33卷 137-147页

作者： Xin-Miao Wan Xue-jiang pu Zhi-Qiang Ren Wei-Hong Huang Yu-Fei Yang Zhi-Hui Li The Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610065China

Superconducting linear accelerators(SCL)have a high acceleration gradient and are capable of operating in a high-duty factor *** high-power and high-intensity SCL,the design of beam dynamics generally follows the principle that the zero-current periodic phase advance(σ0)of each degree of freedom is less than 90°to avoid envelope instability caused by space ***,this principle is obtained under the condition of a completely periodic focusing channel,and it is ambiguous for pseudoperiodic structures,such as linear *** transverse beam dynamics without acceleration have been studied by other researchers,it appears that there are some connections between pure 2D and 3D beam *** on these two points,five focusing schemes for the solenoid and quadrupole doublet channels were designed to simulate the beam behavior with non-constantσ*** them,the four schemes follow the characteristics of variation in the zero-current longitudinal phase advance(σ0l)under a constant acceleration gradient and synchronous *** zero-current transverse phase advance(σ0t)is consistent withσ0l,based on the equipartition *** initialσ0twas set to 120°,110°,100°,and 90°,and was then gradually decreased to approximately 40°at the end of the *** last scheme maintains the maximumσ0tof88°by reducing the acceleration gradient of the corresponding cavities,until the point at whichσ0tequals88°with a normal *** the stopbands obtained from the linearized envelope equations and multiparticle particle-in-cell(PIC)simulations,the transport properties of both continuous and 3D-bunched beams with the acceleration of the five focusing schemes were *** was found that for a CW beam,when tune depression>0.7,σ0tcan break through 90°when the beams were transported in both solenoid and quadrupole doublet periodic focusing *** tune depression<0.7,the conclusions were *** the solenoid focusing system,σ0tcan partially

关键词： Proton beam Superconducting linear accelerators Envelope instability Periodic focusing structure Resonance

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X80钢补焊残余应力模拟与试验验证

石油化工设备 2024年第4期53卷 15-23页

作者：浦江燕集中孟不凡赵建平张涛江苏省特种设备安全监督检验研究院江苏南京201036 国家压力管道元件质量检验检测中心江苏南京211161 南京工业大学江苏南京211816

X80管线钢在铺设或者使用过程中会产生裂纹、气孔等缺陷而需要进行补焊修复。利用ABAQUS有限元分析软件建立了X80钢平板补焊模型,模拟分析了补焊前后X80钢焊接残余应力的变化情况,同时研究了3种不同补焊热输入量对焊接残余应力的影响。... 详细信息

X80管线钢在铺设或者使用过程中会产生裂纹、气孔等缺陷而需要进行补焊修复。利用ABAQUS有限元分析软件建立了X80钢平板补焊模型,模拟分析了补焊前后X80钢焊接残余应力的变化情况,同时研究了3种不同补焊热输入量对焊接残余应力的影响。为验证模拟结果的准确性,开展了3种对应热输入量的补焊试验。模拟及试验研究结果表明,补焊残余应力高于初始焊残余应力,补焊后横向残余应力峰值较初始焊增加55.52%,补焊后纵向残余应力峰值已超过材料屈服强度。随着补焊热输入量的增大,Mises等效残余应力峰值和纵向残余应力无明显改变,但不同路径的横向残余应力变化规律有所不同。试验测量的残余应力值与模拟结果接近,两者的变化趋势一致。

关键词： X80钢残余应力补焊热输入模拟试验验证

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PEPFL:A framework for a practical and efficient privacy-preserving federated learning

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Digital Communications and Networks 2024年第2期10卷 355-368页

作者： Yange Chen Baocang Wang Hang jiang pu Duan Yuan Ping Zhiyong Hong State Key Laboratory of Integrated Service Networks Xidian UniversityXi'an710071China School of Information Engineering Xuchang UniversityXuchang461000China School of Telecommunications Engineering Xidian UniversityXi'an710071China Secure Collaborative Intelligence Laboratory Ant GroupHangzhou310000China Facility of Intelligence Manufacture Wuyi UniversityJiangmen529020China

As an emerging joint learning model,federated learning is a promising way to combine model parameters of different users for training and inference without collecting users’original ***,a practical and efficient solution has not been established in previous work due to the absence of efficient matrix computation and cryptography schemes in the privacy-preserving federated learning model,especially in partially homomorphic *** this paper,we propose a Practical and Efficient Privacy-preserving Federated Learning(PEPFL)***,we present a lifted distributed ElGamal cryptosystem for federated learning,which can solve the multi-key problem in federated ***,we develop a Practical Partially Single Instruction Multiple Data(PSIMD)parallelism scheme that can encode a plaintext matrix into single plaintext for encryption,improving the encryption efficiency and reducing the communication cost in partially homomorphic *** addition,based on the Convolutional Neural Network(CNN)and the designed cryptosystem,a novel privacy-preserving federated learning framework is designed by using Momentum Gradient Descent(MGD).Finally,we evaluate the security and performance of *** experiment results demonstrate that the scheme is practicable,effective,and secure with low communication and computation costs.

关键词： Federated learning Partially single instruction multiple data Momentum gradient descent ElGamal Multi-key Homomorphic encryption

Insight into the Role of Isolated Gold Atoms-Ceria Conjunction in Catalyzing the Water-Gas Shift Reaction

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Chinese Journal of Chemistry 2024年第6期42卷 636-644页

作者： Xin-pu Fu Hui-Zhao Wei-Wei Wang Chun-jiang Jia Key Laboratory for Colloid and Interface Chemistry Key Laboratory of Special Aggregated MaterialsSchool of Chemistry and Chemical EngineeringShandong UniversityJinanShandong250100 China

As the promising catalysts for the water-gas shift(WGS)reaction,the activity of Au-CeO_(2) composites is susceptible to the aggregation size and electronic state of Au *** reports were extensively focused on the discrepancy between nonmetallic Au and metallic Au nanoparticles,whereas the understanding of the authentic role of the isolated Au atoms was ***,we investigated the catalytic behavior and structural information over two types of Au/CeO_(2) catalysts,in which the predominant conjunctions were isolated Au1-CeO_(2) and Aun-CeO_(2),*** on comprehensive characterizations,particularly by in-situ Raman and in-situ DRIFTS,we found that the isolated Au atoms were responsible for enhancing the reducibility of the CeO_(2) *** CO adsorption ability on the isolated Au sites was significantly inferior to clustered Au atoms,especially at relatively high temperatures(>200°C).As a result,the boosted O vacancy on the isolated Au1-CeO_(2) conjunctions could improve the H2O activation ability for the Au-CeO_(2) catalysts and demonstrate a comparable activity to the clustered Aun-CeO_(2) *** work might deepen understanding of the catalytic function for the isolated Au1 site within Au/CeO_(2) systems while catalyzing the WGS reaction.

关键词： Isolated Au atoms Ceria-based catalysts Water-gas shift reaction Defect Adsorption

Inhibitory effect of procyanidin B2 and tannin acid on cholesterol esterase and their synergistic effect with orlistat

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Food Science and Human Wellness 2024年第1期13卷 360-369页

作者： Xiangxin Li Yijing pu Haitao jiang Wenxiao Jiao Wenjun Peng Wenli Tian Weibo jiang Xiaoming Fang Institute of Apicultural Research Chinese Academy of Agricultural SciencesBeijing 100093China College of Food Science and Nutritional Engineering China Agricultural UniversityBeijing 100083China College of Food Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

This study was aimed to analyze the effect of procyanidin B2(PC)and tannin acid(TA)on the activities of cholesterol esterase(CEase)and the inhibitory mechanisms of enzymatic *** interaction mechanisms were investigated by enzymatic kinetics,multi-spectroscopy methods,thermodynamics analysis,molecular docking,and dynamic *** and TA could bind with CEase and inhibit the activity of enzyme in a mixed-competitive manner and non-competitive manner,which was verified by molecular docking simulations and dynamics ***,PC and TA showed the synergistic inhibition with ***,UVvis and the thermodynamic analysis revealed that the complexes were formed from CEase and inhibitors by noncovalent *** revealed by the circular dichroism results,both PC and TA decreased enzymatic activities by altering the conformations of *** inhibition of PC and TA on CEase might be one mechanism for its cholesterol-lowering effect.

关键词： Cholesterol esterase Polyphenols Interaction mechanisms Molecular dynamic simulation Synergistic effect

A Robust N-Terminal Pro-Brain Natriuretic Peptide Assay for Clinical Diagnosis of Heart Failure in Elderly Patients

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Journal of Analysis and Testing 2024年第1期8卷 74-82页

作者： Xue Gong jiangling Wu Jiajia Zhang Zhongwei jiang Yi Wang pu Zhang Engineering Research Center for Biotechnology of Active Substances(Ministry of Education) Chongqing Key Laboratory of Green Synthesis and ApplicationsCollege of ChemistryChongqing Normal UniversityChongqing 401331China Chongqing Research Center for Pharmaceutical Engineering College of PharmacyChongqing Medical UniversityChongqing 400016China Department of Clinical Laboratory University Town Hospital of Chongqing Medical UniversityChongqing 401331China

Heart failure(HF)is a clinical hallmark of cardiovascular syndrome leading to substantial morbidity,repeated hospitalization,and enormous healthcare *** elderly populations continue to increase,biomarker-guided diagnosis and treatment for age-related cardiac decline have become *** evidence demonstrates that N-terminal proBNP(NT-proBNP)can provide a unique window into the diagnosis and risk stratification with ***,a simple yet robust aptasensor is developed for on-site recognizing the NT-proBNP by its targeting aptamer,thus achieving the accurate diagnosis of *** aptasensing system is prepared by absorbing the fluorophore-labeled aptamer strand onto the graphene oxide(GO),leading to efficient quenching without possible off-site signal *** aptamer strand can specifically identify target NT-proBNP molecules via a versatile conformational transformation,resulting in the desorption of the aptamer-NTproBNP complexes from GO and re-generation fluorescence signal,thus allowing sensitive detection of NT-proBNP in 37 clinical blood *** advantage of the high specificity of aptamer-guaranteed recognitions of NT-proBNP,this aptasensor system readily achieves better diagnostic performance for HF than commercially adopted chemiluminescence immunoassay(Siemens,CLIA)in hospitals in terms of accuracy(89.2%vs 83.8%),specificity(89.5%vs 84.2%),and positive predictive value(88.9%vs 83.3%).This work provides a stable option for the diagnosis and treatment of elderly HF-related diseases inclinics.

关键词： NT-proBNP Graphene oxide Aptamer Heart failure Clinical diagnosis

基于改进YOLOv7的小目标交通标志检测算法

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中国电子科学研究院学报 2024年第3期19卷 204-212,247页

作者：郑娟毅杨溥江郭梦月董嘉豪张庆珏西安邮电大学通信与信息工程学院陕西西安710121

在自动驾驶中,检测小目标的精度和漏检问题对于车辆设备对路况判断的准确性至关重要。针对小交通标志检测精度漏检的问题,文中提出一种基于YOLOv7的小目标交通标志检测算法。在Neck中引入ACmix注意力模块,利用ACmix注意力模块提高网络... 详细信息

在自动驾驶中,检测小目标的精度和漏检问题对于车辆设备对路况判断的准确性至关重要。针对小交通标志检测精度漏检的问题,文中提出一种基于YOLOv7的小目标交通标志检测算法。在Neck中引入ACmix注意力模块,利用ACmix注意力模块提高网络对小尺度目标的敏感度,降低噪声所带来的影响;在输出端引入多头自注意力机制SPD卷积构建块,提升输出端对交通标志小目标的检测性能;使用SIoU替换原始YOLOv7网络中的CIoU来优化损失函数,提高网络鲁棒性。为验证所提算法的性能,在CCTSDB交通标志数据集上进行了实验验证。实验结果表明,对于数据集中的小目标,改进后的YOLOv7网络相比于原始的YOLOv7网络,漏检情况得到了明显改善,且map达到了98.7%,运行速度达到了110.5 fps。相较于原始YOLOv7模型,精度和速度均有提升,可以满足交通标志检测的要求。

关键词：交通标志检测 YOLOv7 小目标 SPD SIoU ACmix