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Automatic recognition of landslides based on YOLOv7 and attention mechanism

Journal of Mountain Science 2024年第8期21卷 2681-2695页

作者： SONG Yewei GUO Jie wu gaofeng MA Fengshan LI Fangrui Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Sciences Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Landslide disasters comprise the majority of geological incidents on slopes,posing severe threats to the safety of human lives and property while exerting a significant impact on the geological *** rapid identification of landslides is important for disaster prevention and control;however,currently,landslide identification relies mainly on the manual interpretation of remote sensing *** interpretation and feature recognition methods are time-consuming,labor-intensive,and challenging when confronted with complex ***,automatic landslide recognition has emerged as a pivotal avenue for future *** this study,a dataset comprising 2000 landslide images was constructed using open-source remote sensing images and *** YOLOv7 model was enhanced using data augmentation algorithms and attention *** optimization models were formulated to realize automatic landslide *** findings demonstrate the commendable performance of the optimized model in automatic landslide recognition,achieving a peak accuracy of 95.92%.Subsequently,the optimized model was applied to regional landslide identification,co-seismic landslide identification,and landslide recognition at various scales,all of which showed robust recognition ***,the model exhibits limitations in detecting small targets,indicating areas for refining the deep-learning *** results of this research offer valuable technical support for the swift identification,prevention,and mitigation of landslide disasters.

关键词： Deep learning Landslide detection Natural disasters Attention mechanism Remote sensing

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一维三格点光格子中拓扑振荡及拓扑非对称边缘态

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光子学报 2024年第6期53卷 240-250页

作者：张金江涛辛国国党煜吴高锋西北大学物理学院西安710072

为了全面认识奇数格点原胞中拓扑保护对于光束稳定传输的重要性,系统研究了一维三格点光格子模型中的光传输特性。利用能带理论和耦合模方程,对模型进行了模拟和仿真,发现两种在经典的两格点模型中不存在的具有拓扑保护的光传输行为,即... 详细信息

为了全面认识奇数格点原胞中拓扑保护对于光束稳定传输的重要性,系统研究了一维三格点光格子模型中的光传输特性。利用能带理论和耦合模方程,对模型进行了模拟和仿真,发现两种在经典的两格点模型中不存在的具有拓扑保护的光传输行为,即具有拓扑保护的类拉比振荡光传输和具有拓扑保护的非对称传输,揭示了这两类光传输现象的物理机制,深入解析了光束振荡的本质,并验证了这两类光传输行为的鲁棒性,强调了光学系统在不同条件下的稳定性和可靠性。该研究可为利用奇数格点原胞中拓扑性质操纵光传输的潜在应用提供启示,并为新型拓扑光学器件的设计提供新的思路。

关键词：拓扑光子学拓扑光传输耦合模方程光格子拓扑振荡边缘态拓扑非对称边缘态

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压力管道裂纹检验中无损检测技术分析

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模具制造 2024年第7期24卷 252-254页

作者：卢宁浩吴高锋宁波市特种设备检验研究院浙江宁波315048 宁波明峰检验检测研究院股份有限公司浙江宁波315040

压力管道裂纹检验是保障工业安全生产的重要手段。对此,系统分析了压力管道常见裂纹的类型与特征,重点探讨了磁粉、超声波、射线和涡流检测技术在裂纹检验中的应用。通过实验对比了不同方法的检出率、定位误差、裂纹定量、检测速度等性... 详细信息

压力管道裂纹检验是保障工业安全生产的重要手段。对此,系统分析了压力管道常见裂纹的类型与特征,重点探讨了磁粉、超声波、射线和涡流检测技术在裂纹检验中的应用。通过实验对比了不同方法的检出率、定位误差、裂纹定量、检测速度等性能指标。研究表明,在实际检测中宜结合管道特点合理选择多种方法,并致力于发展新型检测理论与智能分析技术,以期全面提升裂纹的检出、识别与评价水平,为压力管道的安全服役提供可靠保障。

关键词：压力管道裂纹检验无损检测综合评价

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Placement of unmanned aerial vehicles as communication relays in two-tiered multi-agent system:clustering based methods

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Journal of Systems Engineering and Electronics 2020年第2期31卷 231-242页

作者： wu gaofeng WAN Kaifang GAO Xiaoguang FU Xiaowei School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China

The network performance and the unmanned aerial vehicle(UAV)number are important objectives when UAVs are placed as communication relays to enhance the multi-agent information *** problem is a non-deterministic polynomial hard(NP-hard)multi-objective optimization problem,instead of generating a Pareto solution,this work focuses on considering both objectives at the same level so as to achieve a balanced solution between *** on the property that agents connected to the same UAV are a cluster,two clustering-based algorithms,M-K-means(MKM)and modified fast search and find density of peaks(MFSFDP)methods,are first *** the former algorithm requires too much computational time and the latter one requires too many relays,an algorithm for the balanced network performance and relay number(BPN)is proposed by discretizing the area to avoid missing the optimal relay positions and defining a new local density function to reflect the network performance *** results demonstrate that the proposed algorithms are feasible and *** between these algorithms show that the BPN algorithm uses fewer relay UAVs than the MFSFDP and classic set-covering based algorithm,and its computational time is far less than the MKM algorithm.

关键词： unmanned aerial vehicle(UAV) relay communication clustering relay node placement wireless network

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Mobility control of unmanned aerial vehicle as communication relay in airborne multi-user systems

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中国航空学报：英文版 2019年第6期32卷 1520-1529页

作者： gaofeng wu Xiaoguang GAO Xiaowei Fu Kaifang WAN Ruohai DI School of Electronics and Information Northwestern Polytechnical University

In this paper, a model-based adaptive mobility control method for an Unmanned Aerial Vehicle(UAV) acting as a communication relay is presented, which is intended to improve the network performance in airborne multi-user systems. The mobility control problem is addressed by jointly considering unknown Radio Frequency(RF) channel parameters, unknown multi-user mobility, and non-available Angle of Arrival(AoA) information of the received signal. A Kalman filter and a least-square-based estimation algorithm are used to predict the future user positions and estimate the RF channel parameters between the users and the UAV, respectively. Two different relay application cases are considered: end-to-end and multi-user communications. A line search algorithm is proposed for the former, with its stability given and proven, whereas a simplified gradient-based algorithm is proposed for the latter to provide a target relay position at each decision time step, decreasing the two-dimensional search to a one-dimensional search. Simulation results show that the proposed mobility control algorithms can drive the UAV to reach or track the optimal relay position movement, as well as improving network performance. The proposed method reflects the properties of using different metrics as objective network performance functions.

关键词： Channel estimation Gradient methods Motion control Optimization Relay Unmanned aerial vehicle Wireless networks

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Gamma-knife for treating pituitary adenomas in 501 cases: Retrospective case analysis

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Neural Regeneration Research 2007年第7期2卷 443-445页

作者： Jin Lei Hongfei Liao Yi Tang gaofeng wu Gamma-knife Center the 363 Hospital of Chinese PLA Chengdu 610041 Sichuan Province China

BACKGROUND： Gamma-knife is characterized by low risk and low death rate, without trauma, bleeding or infection. MRI has replaced CT as a method of location, and provides a good choice for treating pituitary tumors.OBJECTIVE： To analyze the effectiveness and complications of 501 cases with pituitary adenoma by using gamma-knife retrospectively.DESIGN： Case-analysis.SETTING： Gamma-knife Center, the 363 Hospital of Chinese PLA.PARTICIPANTS： A total of 501 cases were selected from Gamma-knife Center, the 363 Hospital of Chinese PLA from January 1997 to December 2002. All patients were certainly diagnosed with CT and MRI scanning. There were 186 males and 315 females. Their ages ranged from 15 to 84 years with the mean age of 39 years. All patients provided confirmed consent.METHODS： All 501 cases with pituitary adenomas were treated by gamma-knife or combined with operations： The average iso-dose curve was 50% （30% - 65%）, peri-dose was 14 Gy and the average target number was 5.17. ① At 35 months after treatment, patients received follow-up including clinical symptoms,imaging symptoms and endocrine symptoms. ② Patients who received second gamma-knife treatment were analyzed and their complications were observed after operation.MAIN OUTCOME MEASURES： ① Follow-up results of clinical symptoms, image and endocrine indexes; ② second gamma-knife treatment; ③ postoperative complications.RESULTS： Among 501 accepted patients, 275 cases were involved in the follow up of clinical symptoms,154 in image symptoms and 98 in endocrine symptoms. ① Follow-up results of clinical symptoms, image and endocrine indexes： Follow up of clinical symptoms demonstrated that clinical symptoms of 169 cases were relieved, of 68 disappeared, and of 38 deteriorated. Follow-up of image symptoms indicated that pituitary tumor of 25 cases disappeared, of 84 shortened, of 42 not changed, and of 3 enlarged. Follow-up of endocrine symptoms suggested that endocrine of 50 cases was abnormal, of 2

关键词： orphnin morphine patch clamp sodium channel

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健康体检人群内脏脂肪面积与尿酸/高密度脂蛋白胆固醇比值的相关性研究

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中国医药科学 2024年第12期14卷 126-129页

作者：刘玉苓吴高峰王婷婷费大东山东省枣庄市立医院内分泌代谢科山东枣庄277000

目的探讨健康体检人群内脏脂肪面积(VFA)与尿酸(UA)/高密度脂蛋白胆固醇(HDL-C)比值(UHR)的相关性。方法随机选取2020年6月至2022年6月于枣庄市立医院进行健康体检的人群360名。根据VFA值,将人群分为内脏脂肪型肥胖组(VFA≥100 cm^(2))... 详细信息

目的探讨健康体检人群内脏脂肪面积(VFA)与尿酸(UA)/高密度脂蛋白胆固醇(HDL-C)比值(UHR)的相关性。方法随机选取2020年6月至2022年6月于枣庄市立医院进行健康体检的人群360名。根据VFA值,将人群分为内脏脂肪型肥胖组(VFA≥100 cm^(2))172名和对照组(VFA<100 cm^(2))188名,比较两组一般资料及生化指标。采用Spearman相关分析评估VFA与UHR的相关性,多元线性回归分析UHR的影响因素;采用受试者工作特征(ROC)曲线评估UHR对内脏脂肪型肥胖的预测价值。结果与对照组相比,内脏脂肪型肥胖组体重指数(BMI)、VFA、皮下脂肪面积(SFA)、VFA/SFA(V/S)、甘油三酯(TG)、甘油三酯葡萄糖指数(TyG)、UA、UHR水平升高,HDL-C水平降低,差异有统计学意义(均P<0.05)。Spearman相关分析显示,UHR与BMI、VFA、SFA、V/S、TG、TyG呈正相关(P<0.01)。以UHR为因变量,BMI、VFA、SFA、V/S、TG、TyG为自变量进行多元线性回归分析,结果显示TG、VFA是UHR的影响因素。ROC曲线显示UHR预测内脏脂肪型肥胖的曲线下面积为0.741(P<0.001),最佳截断值为0.35。结论健康体检人群UHR与VFA有关,对内脏脂肪型肥胖有较好的预测价值。

关键词：健康体检人群内脏脂肪面积尿酸/高密度脂蛋白胆固醇比值内脏脂肪型肥胖

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Iron Species-Impregnated Granular Activated Carbon as Modified Particle Electrodes Applied in Benzothiazole Adsorption and Electrocatalytic Degradation

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Journal of Harbin Institute of Technology(New Series) 2017年第3期24卷 39-49页

作者： jie ding dihui song xianshu liu zhao song gaofeng wu school of municipal and environmental engineering harbin institute of technologyHarbin 150001China

The object of this study is to prepare iron species-impregnated granular activated carbon as particle electrodes in order to improve their adsorption and electrocatalytic degradation capacity in Benzothiazole *** incorporation of Fe-containing catalysts was performed by Fe(NO_3)_3 *** obtained samples were characterized by BET,Fourier transform infrared spectroscopy,SEM-EDS,powder X-ray diffraction,X-ray photoelectron spectra and *** with pure activated carbon,this modified particle electrodes show higher static adsorption capacities and TOC removal,which have respectively increased by25.9% and 54.4%.Both physisorption and chemisorption exist in the process of benzothiazole adsorption,where the latter plays a major *** this way,the Fe-containing catalysts on modified particle electrodes are demonstrated to make a greater contribution to the improvement of electrocatalytic degradation by decreasing the activated energy by 32%.

关键词： modified activated carbon iron particle electrodes Benzothiazole adsorption electrocatalytic degreadation

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Tailoring esophageal tumor spheroids on a chip with inverse opal scaffolds for drug screening

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Materials Futures 2024年第3期3卷 168-177页

作者： Ruolin Shi Xiangyi wu Yuanjin Zhao Shegan Gao gaofeng Liang Clinical Medical College and Henan Key Laboratory of Microbiome and Esophageal Cancer Prevention and Treatment Henan University of Science and TechnologyLuoyang 471023People’s Republic of China Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210008People’s Republic of China Institute of Organoids on Chips Translational Research Henan Academy of SciencesZhengzhou 450003People’s Republic of China

Esophageal cancer(EC)is characterized by high morbidity and mortality,and chemotherapy has become an indispensable means for comprehensive ***,due to the limitation of the effective in vitro disease model,the development of chemotherapeutic agents still faces great *** this paper,we present a novel tumor spheroid on a chip platform based on inverse opal hydrogel scaffolds to screen chemotherapeutic agents for EC *** the microfluidic emulsion approach,the inverse opal hydrogel scaffolds were generated with tunable and organized pores,which could provide spatial confinement for cell ***,the suspended KYSE-70 cells could successfully form uniform cell spheroids on the inverse opal hydrogel *** was demonstrated that the tumor cell spheroids could recapitulate 3D growth patterns in vivo and exhibited higher sensitivity to the chemotherapy agents compared with monolayer ***,by employing the scaffolds into a microfluidics to construct esophageal tumor on a chip,the device could realize high-throughput tumor cell spheroids generation and drug screening,indicating its promising role in chemotherapy drug development.

关键词： tumor on a chip inverse opal microfluidics chemotherapy drug screening esophageal cancer

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THE ROTATIONALLY PERIODIC SYMMETRY IN BEM

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Acta Mechanica Solida Sinica 1994年第3期7卷 235-244页

作者： Yang Haitian (Department of Engineering Mechanics,Dalian University of Technology,P.R.China)wu gaofeng wu Jingning (Research Institute of Engineering Mechanics,Dalian University of Technology,P.R.China) Department of Engineering Mechanics Dalian University of Technology China Research Institute of Engineering Mechanics Dalian University of Technology China

Rotationally periodic symmetry is exploited in 2-D elastostatic calculation using the *** is proved that the coefficient matrices of the global boundary element equations for the rotationally periodic system are block-circulant so long as a kind of symmetry-adapted reference coordinate system is adopted. Furthermore,an efficient algorithm,which partitions the original problem of solving the boundary element equations into a series of subproblems,is *** method permits arbitrary load distribution for stress analysis problems.

关键词： Rotationally periodic symmetry boundary element

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