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Post-Processing of InSAR Deformation Time Series Using Clustering-Based Pattern Identification

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Journal of Beijing Institute of Technology 2023年第6期32卷 704-716页

作者： Wenxin Zhu fengming hu Feng Xu Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China

Multi-temporal synthetic aperture radar interferometry(MT-InSAR)is a standard technique for mapping clustering and wide-scale deformation.A linear model is often used in phase unwrapping to overcome the ***’s difficult to identify different types of nonlinear ***,the interpretation of nonlinear deformation is very important in monitoring potential *** paper introduces a comprehensive approach for identifying and interpreting different types of deformation within InSAR datasets,integrating initial clustering and classification *** classification is performed using the K-means clustering method to cluster the collected InSAR deformation time-series *** we use F test and Anderson-Darling test(AD test)to simplify the clusters after initial *** technique distinctly discerns the changing trends of deformation signals,thereby providing robust support for interpreting potential deformation scenarios within observed InSAR regions.

关键词： multi-temporal synthetic aperture radar interferometry(MT-InSAR) machine learning hypothesis test nonlinear deformation

Magnetized Micropillar-Enabled Wearable Sensors for Touchless and Intelligent Information Communication

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Nano-Micro Letters 2021年第12期13卷 132-147页

作者： Qian Zhou Bing Ji fengming hu Jianyi Luo Bingpu Zhou Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078P.R.China School of Applied Physics and Materials Research Center of Flexible Sensing Materials and DevicesWuyi UniversityJiangmen 529020P.R.China

The wearable sensors have recently attracted considerable attentions as communication interfaces through the information perception,decoding,and conveying ***,it is still challenging to obtain a sensor that can convert detectable signals into multiple outputs for convenient,e cient,cryptic,and high-capacity information ***,we present a capacitive sensor of magnetic field based on a tilted flexible micromagnet array(t-FMA)as the proposed interaction *** the bidirectional bending capability of t-FMA actuated by magnetic torque,the sensor can recognize both the magnitude and orientation of magnetic field in real time with non-overlapping capacitance *** optimized sensor exhibits the high sensitivity of over 1.3 T-1 and detection limit down to 1 mT with excellent *** a proof of concept,the sensor has been successfully demonstrated for convenient,e cient,and programmable interaction systems,e.g.,touchless Morse code and Braille *** distinguishable recognition of the magnetic field orientation and magnitude further enables the sensor unit as a high-capacity transmitter for cryptic information interaction(e.g.,encoded ID recognition)and multi-control instruction *** believe that the proposed magnetic field sensor can open up a potential avenue for future applications including information communication,virtual reality device,and interactive robotics.

关键词： Electronic skin human–machine interaction Cryptic information communication Magnetic field sensing Tilted magnetized micropillar

Improvement of Attributed Scattering Center Extraction by Using SAR Super-Resolution Preprocessing

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Journal of Beijing Institute of Technology 2023年第6期32卷 685-695页

作者： Guozhen Cheng Jiacheng Chen fengming hu Feng Xu Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China

Synthetic aperture radar(SAR)is able to acquire high-resolution method using the active microwave imaging *** images are widely used in target recognition,classification,and surface analysis,with extracted *** scattering center(ASC)is able to describe the image features for these ***,sidelobe effects reduce the accuracy and reliability of the estimated ASC model *** paper incorporates the SAR super-resolution into the ASC extraction to improve its *** filter bank and subspace methods are demonstrated for preprocessing to supress the *** on the preprocessed data,a reinforcement based ASC method is used to get the *** experimental results show that the super-resolution method can reduce noise and suppress sidelobe effect,which improve accuracy of the estimated ASC model parameters.

关键词： synthetic aperture radar(SAR) spectrum estimation attributed scattering center(ASC) reinforcement learning

Segmentation-aided phase unwrapping for 3D reconstruction with airborne array-InSAR images

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National Science Open 2024年第5期3卷 26-35页

作者： Xin Zhang fengming hu Feng Xu The Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China

Unmanned aerial vehicle(UAV)array InSAR is a new type of single-flight 3D SAR imaging system with the advantages of high coherence and ***,due to the low altitude of the platform,the elevation ambiguity of the system is smaller than the maximal terrain *** the spatial phase unwrapping is conducted based on the assumption of phase continuity,the inappropriate ambiguity will cause significant unwrapping *** this work,a 3D phase unwrapping algorithm assisted by image segmentation is proposed to address this *** Markov random field(MRF)is utilized for image *** optimal spatial phase unwrapping network is achieved based on the segmentation *** asymptotic 3D phase unwrapping is adopted to get the refined 3D *** based on the real airborne array-InSAR data show that the proposed method effectively improves the elevation ambiguity.

关键词： 3D reconstruction image segmentation phase unwrapping array-InSAR

Fiber-junction design for directional bending sensors

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npj Flexible Electronics 2021年第1期5卷 37-44页

作者： Zhundong Li fengming hu Zhiming Chen Jingcheng huang Guoning Chen Runbo Chen Minmin Wei Kete Lao Jiajia hu Jintao Zheng Lvfei Wang Yuan Yao Xiaoyan hu Baowen Liang Min Yang Xihong Lu Jinxiu Wen Jianyi Luo Research Center of Flexible Sensing Materials and Devices School of Applied Physics and MaterialsWuyi UniversityJiangmenChina WYU-Flexwarm Joint Lab for Flexible Sensing Technologies Guangdong Flexwarm Advanced Materials&Technology Co.LtdGuangzhouChina Faculty of Intelligent Manufacturing Wuyi UniversityJiangmenChina School of Art and Design Wuyi UniversityJiangmenChina

Flexible sensors in wearable electronics have become increasingly multifunctional due to the development of materials synthesis and structure *** particular,structural design can not only add capabilities to sensors fabricated from existing available and normal materials,but also offer opportunities for the fabrication of sensors with certain desired ***,we designed a series of fiber-junction structure models,in which two fibers were simply hooked to each other to form a junction on a flexible printed circuit,for fabrication of directional bending *** value and direction of bending angle are related to the change in electronic signal by a theoretical expression,allowing us to employ a simple and practicable method to use available conductive fiber materials to fabricate high-sensitivity,high-resolution and directional bending *** addition,these models are generally applicable,which have broad combination with different conductive fiber,and corresponding bending sensors all possess capability of directional ***,the capability of identifying directional bending was demonstrated by human motion monitoring such as joint bending and muscle contraction.

关键词： directional hook bending

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时序合成孔径雷达干涉测量的多级化解算

同济大学学报（自然科学版） 2019年第12期47卷 1817-1824页

作者：胡凤鸣伍吉仓同济大学测绘与地理信息学院

利用2007~2010年C波段ENVISAT,2010~2015年X波段TerraSAR-X以及2016~2018年C波段Sentinel-1A数据,基于时序合成孔径雷达干涉测量(MT-InSAR)技术对上海磁悬浮及其周边区域进行沉降监测,绘制了该区域的沉降速率图.综合考虑点密度以及空间... 详细信息

利用2007~2010年C波段ENVISAT,2010~2015年X波段TerraSAR-X以及2016~2018年C波段Sentinel-1A数据,基于时序合成孔径雷达干涉测量(MT-InSAR)技术对上海磁悬浮及其周边区域进行沉降监测,绘制了该区域的沉降速率图.综合考虑点密度以及空间分布,提出一种优化的多级化高相干点网络的数据处理方法,在保证测量精度的前提下,有效地提高了可用相干点的数目.对比不同波段的数据,分析了距离以及方位向图像分辨率对相干点数目的影响.试验表明,磁悬浮轨道上的相干点数目与距离向分辨率密切相关.利用实测水准数据,验证了MT-InSAR测量结果的可靠性.结果表明,磁悬浮周边存在多个沉降明显的区域,而磁悬浮轨道一直保持稳定.

关键词：合成孔径雷达干涉(InSAR) 地面沉降磁悬浮相干点多级网络

白头翁皂苷B4对犊牛生长性能、消化代谢和瘤胃发酵的影响

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中国农业科学 2023年第4期56卷 754-765页

作者：卢猛胡凤明屠焰刁其玉中国农业科学院饲料研究所/农业农村部饲料生物技术重点实验室

【目的】通过探究白头翁皂苷B4对犊牛生长性能、消化代谢和瘤胃发酵参数的影响。为新型饲料添加剂的开发提供理论基础。【方法】试验选取60头新生荷斯坦公犊牛，随机分为4组(每组15头)，分别饲喂0(C组)、15(A1组)、30(A2组)、45(A3组)mg... 详细信息

【目的】通过探究白头翁皂苷B4对犊牛生长性能、消化代谢和瘤胃发酵参数的影响。为新型饲料添加剂的开发提供理论基础。【方法】试验选取60头新生荷斯坦公犊牛，随机分为4组(每组15头)，分别饲喂0(C组)、15(A1组)、30(A2组)、45(A3组)mg·d-1的白头翁皂苷B4。试验周期为56d。在犊牛14、28、42和56日龄晨饲前称量体重，并在28、42和56日龄晨饲后2 h采集瘤胃液，测定瘤胃发酵参数。分别在42和63日龄进行两期消化代谢试验，测定营养物质表观消化率和能氮代谢指标。【结果】(1)白头翁皂苷B4对哺乳期犊牛体重和干物质采食量无显著影响(P>0.05)，但犊牛14—28日龄的平均日增重与白头翁皂苷B4呈显著正相关(P0.05)。(3)断奶前，A3组犊牛干物质采食量显著低于C组(P0.05)；断奶后，A2组犊牛的DM和NDF的表观消化率有高于A1组的趋势(0.05≤P0.05),C组摄入总氮显著高于A3组(P0.05)。(6)四组犊牛瘤胃发酵参数差异不显著(P>0.05)。【结论】在哺乳期犊牛代乳品中添加白头翁皂苷B4可以显著提高哺乳期犊牛14—28日龄的平均日增重，降低料肉比和腹泻率，提高饲料转化效率，也可以提高断奶后犊牛的干物质、中性洗涤纤维和酸性洗涤纤维的表观消化率，促进对总能的消化率和代谢率，同时对犊牛瘤胃发酵指标没有不良影响。综合考虑，推荐添加剂量为45 mg·d-1。

关键词：白头翁皂苷B4 犊牛生长性能营养消化瘤胃发酵

白头翁皂苷B4对哺乳期犊牛生长性能和血清指标的影响

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动物营养学报 2022年第2期34卷 1098-1108页

作者：卢猛胡凤明屠焰刁其玉中国农业科学院饲料研究所农业农村部饲料生物技术重点实验室北京100081

本试验旨在研究白头翁皂苷B4对哺乳期犊牛生长性能和血清指标的影响。选取60头新生荷斯坦公犊牛,随机分为4组(每组15头),分别饲喂在代乳粉中添加0(C组)、15(A1组)、30(A2组)和45 mg/d(A3组)白头翁皂苷B4的饲粮。试验期56 d,其中预试期14... 详细信息

本试验旨在研究白头翁皂苷B4对哺乳期犊牛生长性能和血清指标的影响。选取60头新生荷斯坦公犊牛,随机分为4组(每组15头),分别饲喂在代乳粉中添加0(C组)、15(A1组)、30(A2组)和45 mg/d(A3组)白头翁皂苷B4的饲粮。试验期56 d,其中预试期14 d,正试期42 d。每2周空腹称重、测量体尺,每日记录采食量和粪便评分,测定犊牛28和56日龄血清激素水平、抗氧化和免疫指标。结果表明:1)饲粮添加白头翁皂苷B4对哺乳期犊牛体重和平均日采食量均无显著影响(P>0.05),A3组犊牛14~28日龄平均日增重显著高于C组(P0.05)。3)与C组相比,A1、A2和A3组犊牛7~42日龄粪便评分和腹泻率显著降低(P0.05);A3组犊牛血清IGF⁃Ⅰ含量和SOD活性有显著高于C组的趋势(0.050.05);A3组血清IGF⁃Ⅰ含量有显著高于C组的趋势(0.05

关键词：植物提取物白头翁皂苷B4 哺乳期犊牛生长性能血清指标

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奶牛反刍行为调控机制研究进展

动物营养学报 2021年第4期33卷 1869-1879页

作者：王硕胡凤明刁其玉屠焰中国农业科学院饲料研究所奶牛营养学北京市重点实验室北京100081

反刍是反刍动物的特有行为,在实际生产中有着重要的指导作用,但其调控机制尚不清楚。本文综述了奶牛的反刍过程、调控反刍行为的潜在机制和反刍行为的影响因素,以期为进一步探究反刍发生的机制以及提高牛生产性能提供参考依据。

关键词：奶牛反刍行为反刍机制调控机制影响因素