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MobileNetV3-CenterNet:A Target Recognition Method for Avoiding Missed Detection Effectively Based on a Lightweight Network

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Journal of Beijing Institute of Technology 2023年第1期32卷 82-94页

作者： Yajing Li Xiaoyan Xiong Wenbin Xin Jiahai Huang huimin hao School of Taiyuan University of Technology Taiyuan 030000China

To solve the problems in online target detection on the embedded platform,such as high missed detection rate,low accuracy,and slow speed,a lightweight target recognition method of MobileNetV3-CenterNet is *** method combines the anchor-free Centernet network with the MobileNetV3 small network and is trained on the University at Albany Detection and Tracking(UA-DETRAC)and the Pattern Analysis,Statical Modeling and Computational Learn-ing Visual Object Classes(PASCAL VOC)07+12 standard *** reducing the scale of the network model,the MobileNetV3-CenterNet model shows a good balance in the accuracy and speed of target recognition and effectively solves the problems of missing detection of dense and small targets in online *** verify the recognition performance of the model,it is tested on 2683 images of the UA-DETRAC and PASCAL VOC 07+12 datasets,and compared with the analysis results of CenterNet-Deep Layer Aggregation(DLA)34,CenterNet-Residual Network(ResNet)18,CenterNet-MobileNetV3-large,You Only Look Once vision 3(YOLOv3),MobileNetV2-YOLOv3,Single Shot Multibox Detector(SSD),MobileNetV2-SSD and Faster region convolutional neural network(RCNN)*** results show that the MobileNetV3-CenterNet model accurately rec-ognized the dense targets and small targets missed by other methods,and obtained a recognition accuracy of 99.4%with a running speed at 53(on a server)and 14(on an ipad)frame/s,*** MobileNetV3-CenterNet lightweight target recognition method will provide effective technical support for the target recognition of deep learning networks in embedded platforms and online detection.

关键词： target detection MobileNetV3 CenterNet lightweight

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New Dead⁃zone Compensation Approach for Proportional Flow Valve

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Journal of Harbin Institute of Technology(New Series) 2022年第1期29卷 45-56页

作者： Qiang Wu Xingyu Ji He Wang huimin hao Jiahai Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China

To solve the dead⁃zone in the output flow curve of the proportional flow valve without displacement sensor,a dead⁃zone compensation approach is proposed in this *** of detection and feedback of the valve spool position,the proposed approach adopted the pressure drop across the valve metering orifice to accomplish the dead⁃zone *** first step was to test and get the_(max)imum output flow,Q_(max),at a preset reference pressure drop,such asΔP_(0).The next step was to construct the target compensation flow curve,which is a line through(0,0)and(ΔP_(0),Q_(max)).Then a compensation law was designed to approach the target ***,the research results show that the above strategy caused over⁃compensation once the actual pressure drop deviated fromΔP_(0).Thus a correction coefficient,β,was presented to correct the initial compensation law as the pressure drop deviated fromΔP_(0).For example,the test results indicate that the corrected compensation approach could reduce the dead⁃zone from 53.9%to 3.5%at a pressure drop of 1 MPa;as the pressure drop was increased to 5 MPa,the dead⁃zone was reduced from 51.7%to 3.5%.Therefore,the following conclusions can be drawn:the proposed compensation approach is feasible,which can effectively reduce the dead⁃zone and improve the output flow static performance of the proportional flow valve without spool displacement feedback.

关键词： proportional flow valve flow dead⁃zone dead⁃zone compensation pressure drop

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An above-room-temperature switchable molecular dielectric with a large dielectric change between high and low dielectric states

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Science China Chemistry 2013年第7期56卷 917-922页

作者： DU Yang hao huimin ZHANG QianChong Zhao HaiXia LONG LaSheng HUANG RongBin ZHENG LanSun State Key Laboratory for Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University

Dielectric anisotropy of anilinium perchlorate is investigated at various temperatures. Crystal structures at different temperatures reveal that significant dielectric change between low and high dielectric states is closely related to the disorder of the anilinium cation and perchlorate anion at high dielectric state; meanwhile, the conductivity after phase transition also contributes a lot to the high dielectric state.

关键词： switchable molecular dielectric ionic conductivity dielectric anisotropy phase transition

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Contrast Enhancement Using Weighted Coupled Histogram Equalization with Laplace Transform

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Journal of Harbin Institute of Technology(New Series) 2022年第4期29卷 32-40页

作者： huimin hao Wenbin Xin Minglong Bu He Wang Yuan Lan Xiaoyan Xiong Jiahai Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Harbin Electric Machinery Company Limited Harbin 150040China

Histogram equalization is a traditional algorithm improving the image contrast,but it comes at the cost of mean brightness shift and details *** order to solve these problems,a novel approach to processing foreground pixels and background pixels independently is proposed and *** details are mainly contained in the foreground,the weighted coupling of histogram equalization and Laplace transform were adopted to balance contrast enhancement and details *** weighting factors of image foreground and background were determined by the amount of their respective *** proposed method was conducted to images acquired from CVG⁃UGR and US⁃SIPI image databases and then compared with other methods such as clipping histogram spikes,histogram addition,and non⁃linear transformation to verify its *** show that the proposed algorithm can effectively enhance the contrast without introducing distortions,and preserve the mean brightness and details well at the same time.

关键词： contrast enhancement weighted processing histogram equalization Laplace transform

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OPTIMAL IMPULSIVE CONTROL IN COMPETITIVE SYSTEM

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Annals of Differential Equations 2007年第4期23卷 410-415页

作者： hao huimin Li Youwen Jin Zhen Dept. of Math. North University of China Taiyuan 030051

In this paper, the impulsive exploitation of two species periodic competitive system is considered. First, we show that this type of system with impulsive harvesting has a unique positive periodicsolution, which is globally asymptotically stable. Further, by choosing the maximum total revenues as the management objective, we investigate the optimal harvesting policies for periodic competitive system with impulsive harvesting. Finally, we obtain the optimal time to harvest and optimal population level.

关键词： impulsive differential equation competitive system periodic solutions optimal impulsive harvesting policy

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Thiazolo[5,4-d]thiazole-based covalent organic framework microspheres for blue light photocatalytic selective oxidation of amines with O2

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Chinese Journal of Catalysis 2022年第9期43卷 2395-2404页

作者： Fulin Zhang Xia Li Xiaoyun Dong huimin hao Xianjun Lang Sauvage Center for Molecular Sciences and Hubei Key Lab on Organic and Polymeric Optoelectronic Materials College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072HubeiChina

Covalent organic frameworks(COFs)with photoactive units have attracted significant interest in visible light photocatalysis and can present a metal‐free scenario for activating O_(2).As a typical photoactive unit,thiazolo[5,4‐d]thiazole(TzTz)has rarely been added to ***,circumventing the low reversibility of TzTz,it could be embedded into the building blocks beforehand,along with other bonds likeβ‐ketoenamine in forming *** was embedded into 1,1′‐biphenyl‐4,4′‐diamine(BD)using this approach to produce 4,4′‐(TzTz‐2,5‐diyl)dianiline(DTz).Under organobase‐modulated solvothermal conditions,combining 1,3,5‐triformylphloroglucinol(Tp)with BD and DTz resulted in the production ofβ‐ketoenamine‐linked TpBD‐COF and TpDTz‐*** TpDTz‐COF and TpBD‐COF are ***‐COF possessed more adequate separation and charge migration than TpBD‐*** resulted in superior performance for the blue light photocatalytic selective oxidation of benzylamine with O_(2).Furthermore,with O_(2) as the main oxidant,a wealth of benzylamines could be converted into imines over TpDTz‐*** investigations substantiate that oxidation of benzylamines obeys an electron transfer pathway,in which superoxide anion(O_(2)•–)is the crucial reactive oxygen *** study highlights the superiority of TzTz‐embedded COFs in developing effective photocatalytic systems for organic transformations.

关键词： Covalent organic framework Thiazolo[5 4-d]thiazole Visible light Photocatalysis Selective oxidation

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三电极碳纳米管传感器的极间距优化（英文）

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红外与激光工程 2015年第10期44卷 3061-3065页

作者：郝惠敏张勇权龙太原理工大学新型传感器与智能控制教育部重点实验室山西太原030024 西安交通大学电力设备电气绝缘国家重点实验室陕西西安710049

三电极碳纳米管传感器各电极之间的间距大小是影响检测精度的关键因素之一。在用传感器阵列检测多组分气体混合物时,各传感器的极间距很难确定。为三电极碳纳米管气体传感器提出一种基于粒子群算法(PSO)的极间距优化方法。该方法包括设... 详细信息

三电极碳纳米管传感器各电极之间的间距大小是影响检测精度的关键因素之一。在用传感器阵列检测多组分气体混合物时,各传感器的极间距很难确定。为三电极碳纳米管气体传感器提出一种基于粒子群算法(PSO)的极间距优化方法。该方法包括设计极间距、组建由不同极间距的多个传感器组成的传感器阵列、建立包括极间距及检测离子电流的数据库、建立混合气体定量分析模型及极间距优化等步骤。采用多组由不同极间距的三个碳纳米管传感器构成的传感器阵列对NO和SO2混合气体进行测量,其中各传感器的极间距均采用上述方法优化。实验结果显示,上述极间距优化方法能够有效地选择电极之间的最佳间距,优化极间距后的传感器也获得了更高的检测灵敏度。

关键词：碳纳米管传感器极间距优化粒子群优化

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变排量非对称轴向柱塞泵控制特性分析

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农业机械学报 2019年第3期50卷 368-376页

作者：黄家海贺伟郝惠敏权龙太原理工大学机械与运载工程学院太原030024 太原理工大学新型传感器与智能控制教育部重点实验室太原030024

变排量非对称轴向柱塞泵(Variable-displacement asymmetric axial piston pump,VDAAPP)直接控制单活塞杆缸闭式系统具有结构紧凑、能效高的优势。在定排量三配流窗口轴向柱塞泵的基础上,提出基于斜盘摆角位置反馈的PD变排量控制策略。... 详细信息

变排量非对称轴向柱塞泵(Variable-displacement asymmetric axial piston pump,VDAAPP)直接控制单活塞杆缸闭式系统具有结构紧凑、能效高的优势。在定排量三配流窗口轴向柱塞泵的基础上,提出基于斜盘摆角位置反馈的PD变排量控制策略。建立VDAAPP的数学模型,运用近似线性化及降阶的方法分析影响VDAAPP频响的因素,并对斜盘变量阻力矩进行研究。在AMESim中建立VDAAPP电液仿真模型,通过对斜盘受力特性的仿真分析,验证了阻力矩计算的正确性。搭建VDAAPP试验平台,对系统的动态性能进行测试。试验和仿真结果表明,当非对称轴向柱塞泵一个配流窗口吸油、两个配流窗口排油时,非对称轴向柱塞泵斜盘存在较大的单向阻力矩,此单向力矩会降低斜盘摆角减小过程中的动态响应;当采用PD控制、比例系数kp=3时,VDAAPP可实现零超调的变排量控制,且具有较高的响应速度,验证了所提控制方法的合理性。

关键词：轴向柱塞泵变排量泵控缸斜盘受力

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变长度柔性提升系统动力学特性与减振研究

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振动．测试与诊断 2024年第3期44卷 439-449,615页

作者：郭瑜黄家海郝惠敏李晓东太原理工大学机械与运载工程学院太原030024

针对矿井提升机这类变长度柔性提升系统在外界激励和运动冲击作用下的异常振动问题,基于Hamilton原理建立提升系统纵向-横向-侧向非线性动力学模型对耦合振动开展研究。首先,在建模过程中将提升机摩擦轮纵向-横向-侧向变幅值波动视为钢... 详细信息

针对矿井提升机这类变长度柔性提升系统在外界激励和运动冲击作用下的异常振动问题,基于Hamilton原理建立提升系统纵向-横向-侧向非线性动力学模型对耦合振动开展研究。首先,在建模过程中将提升机摩擦轮纵向-横向-侧向变幅值波动视为钢丝绳上端的边界激励;其次,通过Galerkin法将边界激励作用下的偏微分方程离散为常微分方程组进行数值求解;最后,分析了加速度、加加速度和运动轨迹对系统动力学特性的影响,并基于标准逻辑函数对运动轨迹进行优化,以抑制系统运行过程中的冲击与振动。仿真与现场测试结果表明:耦合振动以纵向振动为主,且钢丝绳长度增加时系统对运动状态突变冲击更加敏感,更易激发剧烈的纵向振动;相较于传统4阶多项式轨迹,系统在提升工况下的纵向振动减小了10.85%,最大动张力减小了9.06%。

关键词：柔性传动系统矿井提升机耦合振动减振

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摩擦提升机恒减速制动工况下的防滑特性

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振动．测试与诊断 2020年第6期40卷 1048-1056,1227页

作者：黄家海于培郝惠敏落财秀太原理工大学新型传感器与智能控制教育部重点实验室太原030024 太原理工大学机械与运载工程学院太原030024

摩擦提升机是一种利用钢丝绳与卷筒之间的摩擦力来传动运动的矿井提升设备,其在紧急制动过程中容易出现钢丝绳打滑现象,严重威胁设备的安全运行。针对此问题,以恒减速紧急制动工况下的钢丝绳滑动为研究对象,提出利用加速度偏差对紧急制... 详细信息

摩擦提升机是一种利用钢丝绳与卷筒之间的摩擦力来传动运动的矿井提升设备,其在紧急制动过程中容易出现钢丝绳打滑现象,严重威胁设备的安全运行。针对此问题,以恒减速紧急制动工况下的钢丝绳滑动为研究对象,提出利用加速度偏差对紧急制动过程中罐笼加速度进行归一化处理,以加速度偏差系数发生突变增大为钢丝绳发生临界打滑的判断依据,从而获得极限减速度。利用经过实验验证的摩擦提升机仿真模型和本研究所提出的方法获得了一系列恒减速制动工况下的极限减速度,经线性拟合后得到极限减速度预测模型,ax=-k1M+b1(下放工况)和ax=k2M+b2(提升工况),该预测模型将有助于恒减速制动工作点范围的确定,从而可为摩擦提升机防滑策略的制定提供依据。

关键词：提升机紧急制动钢丝绳滑动恒减速

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