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Recognition and localization of strawberries from 3D binocular cameras for a strawberry picking robot using coupled YOLO/Mask R-CNN

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 175-179页

作者： heming Hu Yutaka Kaizu Hongduo Zhang Yongwei xu Kenji Imou Ming Li Jingjing Huang Sihui Dai Graduate School of Agricultural and Life Sciences the University of TokyoTokyo 113-0033Japan Hunan Agricultural Equipment Research Institute ChangshaHunan 410125China College of Horticulture Hunan Agricultural UniversityChangshaHunan 410128China

To solve the problem of high labour costs in the strawberry picking process,the approach of a strawberry picking robot to identify and find strawberries is suggested in this ***,1000 images including mature,immature,single,multiple,and occluded strawberries were collected,and a two-stage detection Mask R-CNN instance segmentation network and a one-stage detection YOLOv3 target detection network were used to train a strawberry identification model which classified strawberries into two categories:mature and *** accuracy ratings for YOLOv3 and Mask R-CNN were 93.4%and 94.5%,***,the ZED stereo camera,triangulation,and a neural network were used to locate the strawberry in three ***3 identification accuracy was 3.1 mm,compared to Mask R-CNN of 3.9 *** strawberry detection and positioning method proposed in this study may effectively be used to supply the picking robot with a precise location of the ripe strawberry.

关键词： strawberry detection 3D point cloud mean-shift clustering method

Unusual tracks:Statistical,controlling factors and model prediction

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Tropical Cyclone Research and Review 2023年第4期12卷 309-322页

作者： Ying Li Julian heming Ryan D.Torn Shaojun Lai Yinglong xu Xiaomeng Chen State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijingChina UK Met Office ExeterUK State University of New York New YorkUSA Fujian Key Laboratory of Severe Weather FuzhouChina Fujian Observatory of Pingtan Marine Meteorology PingtanChina Chinese Meteorological Center BeijingChina Fujian Provincial Meteorological Service Center FuzhouChina

The progress of research and forecast techniques for tropical cyclone(TC)unusual tracks(UTs)in recent years is reviewed.A major research focus has been understanding which processes contribute to the evolution of the TC and steering flow over time,especially the reasons for the sharp changes in TC motion over a short period of *** TCs are located in the vicinity of monsoon gyres,TC track forecast become more difficult to forecast due to the complex interaction between the TCs and the ***,the convection and latent heat can also feed back into the synoptic-scale features and in turn modify the steering *** this report,two cases with UTs are examined,along with an assessment of numerical model *** in numerical modelling and in particular the development of ensemble forecasting systems have proved beneficial in the prediction of such *** are still great challenges in operational track forecasts and warnings,such as the initial TC track forecast,which is based on a poor pre-genesis analysis,TC track forecasts during interaction between two or more TCs and track predictions after ***,artificial intelligence(AI)methods such as machine learning or deep learning have been widely applied in the field of TC *** TC track forecasting,a more effective method of center location is obtained by combining data from various sources and fully exploring the potential of AI,which provides more possibilities for improving TC prediction.

关键词： Unusual TC tracks Track controlling factors Track predictions Track forecast errors

Phenomena and Mechanism of Positive Pulsed Discharge Branching in Two-phase Mixtures

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高电压技术 2013年第9期39卷 2152-2158页

作者： DENG heming ZHANG Guangzhou xu Yuhang HE Zhenghao ZHU Hongzhao LIANG Wei State Grid Electric Power Research Institute Wuhan 430074 China State Grid Corporation of China Beijing 100031 China Ximen Power Supply Bureau of Fujian Electric Power Company Ltd. State Grid Corporation of China Ximen 361004 China Huazhong University of Science and Technology Wuhan 430074 China

Discharge branching is a general phenomenon in atmospheric-pressure air,dense gases,and two-phase mixtures(TPMs).In this work,an ultraviolet imaging device is utilized to investigate the branching of positive pulsed discharges in *** among the captured images indicates that the branching is caused by the voltages and the macropartilces in the discharge channels combining *** interaction of macroparticles with ions,electrons or photons is one reason for the branching behavior of pulsed *** generation of electrons at the discharge front closely relates to the work function of dielectric macroparticles,which is a key parameter influencing the electron-emission ability of macroparticle *** electric field alteration under various applied voltage in TPMs,which is calculated by a two-dimension finite element method,is the other reason for the guiding effect of macroparticles on the streamers compared with in the air.

关键词：两相混合物放电现象脉冲放电电子发射能力机制 TPM 大颗粒大气压力

Tough,rapid self-recovery and responsive organogel-based ionotronic for intelligent continuous passive motion system

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npj Flexible Electronics 2023年第1期7卷 283-292页

作者： Jie Tang Yuan He Dan xu Weijie Zhang Yang Hu heming Song Yunxia Zhang Yong Mei Chen Yang Yang Kai Zhang College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021P.R.China Sustainable Materials and Chemistry University of GöttingenBüsgenweg 437077 GöttingenGermany Department of Joint Surgery Honghui HospitalHealth Science CenterXi’an Jiaotong UniversityXi’an 710054P.R.China

Continuous passive motion(CPM)is an adjunct therapy to the standard postoperative rehabilitation regimen of joint *** capability of real-time monitoring actual bending angle of knee joints is highly desired for treatment strategies of personalized postoperative rehabilitation and *** we report an intelligent CPM system for personalized rehabilitation and telemedicine based on the flexible and versatile ionotronic that possesses impressive mechanical properties(2.56 MPa tensile strength;11.63 MJ m^(−3)toughness),fast self-recovery ability(60 s)and broaden environmental tolerance(−60–45°C).Especially,the ionotronic responds fast and shows stability for cyclic strain sensing,ensuring the detection of actual joint bending angle with high sensitivity and *** intelligent CPM system assembled with this ionotronic and a wireless transmitter was constructed,opening up a horizon for developing digital intelligent medical that can remotely monitor the movement of hospitalized/at-home patients who use CPM for personalized postoperative rehabilitation.

关键词： toughness passive system

Adult-born neurons in critical period maintain hippocampal seizures via local aberrant excitatory circuits

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Signal Transduction and Targeted Therapy 2023年第7期8卷 3427-3442页

作者： Liying Chen Yingwei xu heming Cheng Zhongxia Li Nanxi Lai Menghan Li Yeping Ruan Yang Zheng Fan Fei Cenglin xu Jiao Ma Shuang Wang Yan Gu Feng Han Zhong Chen Yi Wang Institute of Pharmacology&Toxicology College of Pharmaceutical SciencesSchool of MedicineZhejiang UniversityHangzhouChina Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical SciencesZhejiang Chinese Medical UniversityHangzhouChina Zhejiang Rehabilitation Medical Center Department The Third Affiliated HospitalZhejiang Chinese Medical UniversityHangzhouChina Key Laboratory of Cardiovascular&Cerebrovascular Medicine Drug Target and Drug Discovery CenterSchool of PharmacyNanjing Medical UniversityNanjingChina

Temporal lobe epilepsy(TLE),one common type of medically refractory epilepsy,is accompanied with altered adult-born dentate granule cells(abDGCs).However,the causal role of abDGCs in recurrent seizures of TLE is not fully ***,taking advantage of optogenetic and chemogenetic tools to selectively manipulate abDGCs in a reversible manner.

关键词： epilepsy seizures maintain

优化Tikhonov迭代法在电容层析成像中的应用

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东南大学学报（自然科学版） 2010年第3期40卷 527-532页

作者：高鹤明许传龙王式民东南大学能源与环境学院南京210096

为了提高电容层析成像的速度和质量,将收敛速度较快的Tikhonov迭代法应用于电容层析成像.Tikhonov迭代法的难点在于正则化系数的选取,通过对其正则化作用的分析,提出利用对灵敏场的奇异值分解,选取最大奇异值作为正则化系数,从而保证算... 详细信息

为了提高电容层析成像的速度和质量,将收敛速度较快的Tikhonov迭代法应用于电容层析成像.Tikhonov迭代法的难点在于正则化系数的选取,通过对其正则化作用的分析,提出利用对灵敏场的奇异值分解,选取最大奇异值作为正则化系数,从而保证算法收敛的稳定性;同时为了提高收敛速度,将线性反演算法(LBP)计算所得的灰度作为迭代的初始值.结果表明:该正则化系数具有更高的稳定性和收敛速度;Tikhonov迭代法与Landweber迭代法相比具有收敛速度更快,重建图像质量更高的优点.

关键词：电容层析成像 Tikhonov迭代法奇异值正则化图像重建

一种硅MEMS陀螺谐振频率与Q值的快速测量方法

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中国惯性技术学报 2018年第1期26卷 133-140页

作者：卜峰徐大诚赵鹤鸣苏州大学微纳传感技术研究中心苏州215000

为了解决平板电极硅微机电系统(MEMS)陀螺谐振频率和Q值的快速测定问题,提出一种基于阶跃激励余振分析的振动特性参数测量方法。首先,利用平板电容电极的吸合效应,提出一种直流阶跃激励方法,使陀螺振子产生较大初始位移的余振信号。然后... 详细信息

为了解决平板电极硅微机电系统(MEMS)陀螺谐振频率和Q值的快速测定问题,提出一种基于阶跃激励余振分析的振动特性参数测量方法。首先,利用平板电容电极的吸合效应,提出一种直流阶跃激励方法,使陀螺振子产生较大初始位移的余振信号。然后,结合FFT和Morlet复小波变换对余振信号进行高分辨率频谱分析,获得谐振频率。接着,对余振信号进行Hilbert变换以提取包络线,通过最小二乘指数拟合获得阻尼系数,从而得到Q值。仿真测试表明,该方法能够精确地获得特性参数,相对误差达到了10-5量级。在角振动陀螺上的实验表明,该方法与扫频法获得的结果基本一致,且有效缩短了测试时间。

关键词：硅MEMS陀螺谐振频率 Q值阶跃激励 Morlet复小波变换 Hilbert变换

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基于改进型卡尔曼滤波的运动载体姿态估计

传感技术学报 2020年第9期33卷 1279-1284页

作者：徐鑫赵鹤鸣苏州大学电子信息学院江苏苏州215000

针对MEMS陀螺零偏导致运动载体姿态精度下降的问题,本文以MEMS惯性测量器件MPU6050为核心,提出了一种基于改进型卡尔曼滤波的姿态估计算法。采用欧拉角作为姿态解算的基础,通过惯性测量单元(IMU)测量运动载体的姿态数据,采用改进型卡尔... 详细信息

针对MEMS陀螺零偏导致运动载体姿态精度下降的问题,本文以MEMS惯性测量器件MPU6050为核心,提出了一种基于改进型卡尔曼滤波的姿态估计算法。采用欧拉角作为姿态解算的基础,通过惯性测量单元(IMU)测量运动载体的姿态数据,采用改进型卡尔曼滤波,对陀螺仪和加速度计数据进行融合,并实时估计陀螺零偏。实验结果表明,本文提出的算法能够获得较高精度的姿态信息,抑制MEMS陀螺零偏引起的姿态发散,可以准确地表示运动载体在静态和动态情况下的方位。

关键词：姿态估计数据融合算法改进型卡尔曼滤波惯性测量单元

Reflection sensitivity of dual-state quantum dot lasers

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Photonics Research 2023年第10期11卷 1713-1722页

作者： ZHIYONG JIN heming HUANG YUEGUANG ZHOU SHIYUAN ZHAO SHIHAO DING CHENG WANG YONG YAO XIAOCHUAN xu FRÉDÉRIC GRILLOT JIANAN DUAN State Key Laboratory on Tunable Laser Technology School of Electronic and Information EngineeringHarbin Institute of TechnologyShenzhen 518055China LTCI Telecom ParisInstitut Polytechnique de Paris91120 PalaiseauFrance DTU Electro Department of Electrical and Photonics EngineeringTechnical University of Denmark2800 LyngbyDenmark School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China Center for High Technology Materials The University of New-MexicoAlbuquerqueNew Mexico 87106USA

This work experimentally and theoretically demonstrates the effect of excited state lasing on the reflection sensitivity of dual-state quantum dot lasers,showing that the laser exhibits higher sensitivity to external optical feedback when reaching the excited state lasing *** sensitivity can be degraded by increasing the excited-to-ground-state energy separation,which results in a high excited-to-ground-state threshold *** addition,the occurrence of excited state lasing decreases the damping factor and increases the linewidth enhancement factor,which leads to a low critical feedback *** findings illuminate a path to fabricate reflectioninsensitive quantum dot lasers for isolator-free photonic integrated circuits.

关键词： state excited quantum