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Sequential Gaussian Approximation Filter for Target Tracking With Nonsynchronous Measurements

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2019年第1期55卷 407-418页

作者： Yang, Xusheng zhang, Wen-An Yu, Li Yang, fuwen Zhejiang Univ Technol Dept Automat Hangzhou 310023 Zhejiang Peoples R China Zhejiang Prov United Key Lab Embedded Syst Hangzhou 310023 Zhejiang Peoples R China Griffith Univ Griffith Sch Engn Gold Coast Qld 4222 Australia

This paper presents an adaptive sequential fusion estimation method for the target tracking with nonsynchronous measurements in wireless sensor networks (WSNs). Based on Gaussian assumption and Bayesian inference, a sequential cubature Kalman filtering (SCKF) method, as well as its square root form (SR-SCKF), is presented by applying the cubature rule to approximate the function x Gaussian integrals. By taking into consideration the time-varying properties of the measurement noise and the linearization errors, some adaptive factors are introduced into the SCKF to compensate for the measurement uncertainties based on Chi-square tests. The convergence analysis of the SCKF is presented. It is proved that the adaptive SCKF (ASCKF) has a better convergence property than the SCKF. Both simulations and experiments of a target tracking example are presented to show the effectiveness and superiority of the proposed ASCKF method.

关键词： Noise measurement Wireless sensor networks Mobile robots Kalman filters Measurement uncertainty Target tracking Bayes methods

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Conduction mechanism and impedance analysis of HfOx-based RRAM at different resistive states

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APPLIED SURFACE SCIENCE 2022年 600卷

作者： Bai, Jiao Xie, Weiwei zhang, Weiqi Yin, Zhipeng Wei, Shengsheng Qu, Dehao Li, Yue Qin, fuwen Zhou, Dayu Wang, Dejun Dalian Univ Technol Key Lab Intelligent Control & Optimizat Ind Equipm Fac Elect Informat & Elect Engn Sch Control Sci & EngnMinist Educ Dalian 116024 Peoples R China Dalian Univ Technol Key Lab Mat Modificat Laser Ion & Electron Beams Dalian 116024 Peoples R China Liaoning Prov Dalian Univ Technol Key Lab Integrated Circuit & Biomed Elect Syst Dalian 116023 Peoples R China

Conduction mechanism and impedance analysis of both the low resistance state (LRS) and high resistance state (HRS) are performed on TiN/HfOx/Pt resistive-switching memory devices at various temperatures. The dc conduction mechanism in LRS is dictated by Ohmic conduction, whereas by trap controlled space-charge -limited current conduction in HRS. The XPS analysis results on the surface of the HfOx film indicated the presence of oxygen deficiencies. The equivalent physical model under various resistance states is established by using ac impedance spectroscopy method, that is related to oxygen vacancies in the HfOx film. We further discussed the activation energy of dc and ac in the HRS and found the conduction occurs at the grain boundary. Through analysis of different resistance states of HfOx-based resistive switching memories, the conduction mechanism correlation between time and frequency domain is established.

关键词： HfOx-RRAM Conduction mechanism Impedance analysis Resistive switching Activation energy

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Parameter identification of surface mount permanent magnet synchronous motor based on recursive least square method

Parameter identification of surface mount permanent magnet s...

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Chinese Automation Congress (CAC)

作者： Zeng, Qiyi zhang, Qiao Wu, Yong Su, fuwen Hu, Kai Zhou, Ningqun Wuhan Univ Technol Sch Automat Wuhan Peoples R China Wuhan Univ Technol Sch Comp Sci & Technol Wuhan Peoples R China

ISBN: (纸本)9781728176871

Under large interference, in order to keep the surface-mounted permanent magnet synchronous motor with better operating characteristics, real-time identification of the parameters such as resistance, inductance and flux linkage during motor operation becomes very necessary. This paper proposes an online self-applicable identification method for motor parameters based on recursive least squares method. The parameter identification model is analyzed in Matlab / Simulink, which proves that the method can accurately identify the values of resistance, inductance and flux linkage parameters. It also proves the value of this method.

关键词： surface-mounted permanent magnet synchronous motor online adaptive identification recursive least squares

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睑缘炎中医治疗现状

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亚太传统医药 2018年第8期14卷 78-80页

作者：王莉萌张富文曹旭成都中医药大学眼科学院四川成都610072 北京中医药大学北京100029

睑缘炎是眼科常见疾病,临床发病率高,严重者可引起结膜、角膜病变,影响视力。目前西医对该病尚缺乏特异性治疗方法。近年来,中药内服、熏洗、中药离子导入等方法治疗睑缘炎取得了较大进展,拟针对近年来相关研究成果,对睑缘炎的中医治疗... 详细信息

睑缘炎是眼科常见疾病,临床发病率高,严重者可引起结膜、角膜病变,影响视力。目前西医对该病尚缺乏特异性治疗方法。近年来,中药内服、熏洗、中药离子导入等方法治疗睑缘炎取得了较大进展,拟针对近年来相关研究成果,对睑缘炎的中医治疗进展进行归纳总结。

关键词：睑缘炎中医治疗

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超声造影在识别Ⅰ期子宫静脉内平滑肌瘤病中的诊断价值

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中国超声医学杂志 2024年第11期40卷 1293-1296页

作者：陈琦张超顾小宁石富文刘芳成珍珍杨敏刘冬梅首都医科大学附属北京世纪坛医院超声科首都医科大学附属北京朝阳医院超声科

目的分析Ⅰ期子宫静脉内平滑肌瘤病（IVL）的超声造影特征，探讨超声造影识别Ⅰ期IVL的应用价值。方法回顾性收集经手术病理证实为Ⅰ期IVL的16例患者的临床病历、常规超声与超声造影资料，总结Ⅰ期IVL的常规超声及超声造影特征。结果 ... 详细信息

目的分析Ⅰ期子宫静脉内平滑肌瘤病（IVL）的超声造影特征，探讨超声造影识别Ⅰ期IVL的应用价值。方法回顾性收集经手术病理证实为Ⅰ期IVL的16例患者的临床病历、常规超声与超声造影资料，总结Ⅰ期IVL的常规超声及超声造影特征。结果（1）常规超声和超声造影的诊断准确度分别为25%（4/16）、62.5%（10/16）,两者差异有统计学意义（χ2=4.571,P<0.05）。（2）常规超声诊断正确的4例均为宫旁病灶，1例表现为混合回声肿块，内见迂曲无回声；3例表现为静脉内低回声。（3）超声造影表现为增强早期肿块内部血管先显影，横切面显示多个斑点状增强区；达峰期不均匀低增强，并呈“蠕虫样”沿静脉延伸；增强晚期无明显的“血管环征”,静脉内IVL表现为低增强的病灶被周围持续高增强的静脉血流环绕的特点，呈“夹心饼干”征。结论超声造影在Ⅰ期IVL的诊断中具有重要意义，能够弥补常规超声的不足，提高诊断准确度。

关键词：子宫静脉内平滑肌瘤病超声超声造影

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A novel set-membership control strategy for discrete-time linear time-varying systems

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IET CONTROL THEORY AND APPLICATIONS 2019年第18期13卷 3087-3095页

作者： zhang, Yilian Yang, fuwen Han, Qing-Long Zhu, Yanfei Shanghai Maritime Univ Key Lab Marine Technol & Control Engn Minist Commun Shh 201306 Peoples R China Griffith Univ Griffith Sch Engn Gold Coast Campus Southport Qld 4222 Australia Swinburne Univ Technol Sch Software & Elect Engn Melbourne Vic 3122 Australia Shanghai Normal Univ Coll Informat Mech & Elect Engn Shh 200234 Peoples R China

A novel set-membership control strategy is investigated for a class of discrete time-varying systems with unknown-but-bounded noises. Different from some existing set-membership estimation based control methods, the proposed control strategy is designed by using state estimation sets instead of some specific estimation points. The controlled performance requirement is modelled as a new set-membership performance constraint which ensures that the controlled output meets the requirement at any time instant. First, the set-membership filtering method is used for obtaining the ellipsoidal state estimation set. Second, a set-membership controller is constructed by utilising the state estimation which is arbitrarily chosen from the corresponding estimation set. Accordingly, sufficient conditions are derived such that the controlled system is asymptotically stable and satisfies the proposed performance constraint in the presence of unknown-but-bounded noises at each time instant. Then, a constructive computational algorithm is provided to describe the proposed control strategy. Finally, illustrative simulation examples are presented to demonstrate the effectiveness of the proposed method.

关键词： control system synthesis state estimation time-varying systems discrete time systems filtering theory set theory linear systems set-membership control strategy discrete-time linear time-varying systems discrete time-varying systems unknown-but-bounded noises existing set-membership estimation state estimation sets specific estimation points controlled performance requirement set-membership performance constraint controlled output set-membership filtering method ellipsoidal state estimation set set-membership controller corresponding estimation controlled system

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一种新的电梯平衡系数测试方法及其测试仪器

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中国电梯 2024年第1期35卷 32-37页

作者：张学伦邓富文陈武孙邦文重庆品智建设工程质量检测有限公司重庆401120

在电梯运行过程中,轿厢与对重两侧的重量分配呈连续变化趋势,导致平衡系数处于动态变化状态;而且,电梯安装完毕后各运动部件的重量很难核实,从而导致在电梯安装调试和检验检测中较难准确测试电梯平衡系数。针对此难题,分析了电梯平衡系... 详细信息

在电梯运行过程中,轿厢与对重两侧的重量分配呈连续变化趋势,导致平衡系数处于动态变化状态;而且,电梯安装完毕后各运动部件的重量很难核实,从而导致在电梯安装调试和检验检测中较难准确测试电梯平衡系数。针对此难题,分析了电梯平衡系数的参数特性和传统测试方法存在的问题,提出了一种可以便捷、高效、准确测试平衡系数范围的方法,并设计了用于该测试方法的测试仪。最后分析了该测试方法及测试仪的特点,并通过实例验证了该测试方法的可行性。

关键词：电梯平衡系数测试方法测试仪

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Insights into the roles of fungi and protist in the giant panda gut microbiome and antibiotic resistome

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ENVIRONMENT INTERNATIONAL 2021年 155卷 106703页

作者： Zhu, Dong Lu, Lu zhang, Zejun Qi, Dunwu zhang, Mingchun O'Connor, Patrick Wei, fuwen Zhu, Yong-Guan Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Urban & Reg Ecol Beijing 100085 Peoples R China China West Normal Univ Coll Life Sci Key Lab Southwest China Wildlife Resources Conser Nanchong 637002 Peoples R China Chengdu Res Base Giant Panda Breeding Chengdu 611081 Sichuan Peoples R China China Conservat & Res Ctr Giant Panda Dujiangyan 611830 Peoples R China China West Normal Univ Coll Environm Sci & Engn Nanchong 637009 Peoples R China Univ Adelaide Ctr Global Food & Resources Adelaide SA 5005 Australia Chinese Acad Sci Inst Zool Key Lab Anim Ecol & Conservat Biol Beijing 100101 Peoples R China Chinese Acad Sci Inst Urban Environm Key Lab Urban Environm & Hlth 1799 Jimei Rd Xiamen 361021 Fujian Peoples R China

The mammal gut is a rich reservoir of antibiotic resistance genes (ARGs), and the relationship between bacterial communities and ARGs has been widely studied. Despite ecological significance of microeukaryotes (fungi and protists), our understanding of their roles in the mammal gut microbiome and antibiotic resistome is still limited. Here, we used amplicon sequencing, metagenomic sequencing and high-throughput quantitative PCR to examine microbiomes and antibiotic resistomes of 41 giant panda fecal samples from individuals with different genders, ages, sampling sites and diet. Our results show that diverse protists inhabit in the giant panda gut ecosystem, dominated by consumers. Higher abundance of protistan consumers was detected in the elder compared to subadult and adult giant pandas. Diet is the main driving factor of variation in ARGs in the giant panda gut microbiome. Weighted correlation network analysis identified two key microbial modules from multitrophic communities, which all contributed to the variation in ARGs in the giant panda gut. Protists occupied an important position in the two modules which were dominated by fungal taxa. Deterministic processes made a more important contribution to microbial community assembly of the two modules than to bacterial, fungal and protistan communities. This study sheds new light on how key microbial modules contribute to the variation in ARGs, which is crucial in understanding dynamics of antibiotic resistome in the mammal gut, particularly endangered species.

关键词： Fungi Protist Antibiotic resistance genes Network analysis Multitrophic communities Neutral model

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大肠杆菌表达动物病毒样颗粒疫苗的研究进展

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中国兽医科学 2024年第7期54卷 955-961页

作者：李幽幽扶星星朱玲王永胜吴福文张海徐志文四川农业大学动物生物技术中心四川成都611100 四川水利职业技术学院生物工程学院四川成都611230 四川百诺吉科技有限公司四川绵阳621000

大肠杆菌表达宿主因其表达量高、周期短、成本低等诸多优势而被广泛用作异源蛋白质的表达。据统计,超过30%的重组蛋白质药物和50%重组蛋白质的制备是使用大肠杆菌作为表达宿主的。大肠杆菌是低成本表达重组蛋白的首选生物之一,这对于兽... 详细信息

大肠杆菌表达宿主因其表达量高、周期短、成本低等诸多优势而被广泛用作异源蛋白质的表达。据统计,超过30%的重组蛋白质药物和50%重组蛋白质的制备是使用大肠杆菌作为表达宿主的。大肠杆菌是低成本表达重组蛋白的首选生物之一,这对于兽用疫苗的生产尤其重要。本文系统阐述了大肠杆菌表达系统在动物病毒样颗粒疫苗应用中的生产和研究进展,并且总结了大肠杆菌表达系统在疫苗应用中存在的问题及现有的解决策略,以期为以大肠杆菌作为表达宿主的动物病毒样颗粒疫苗研制提供参考。

关键词：大肠杆菌表达宿主病毒样颗粒疫苗

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Combustion characterization of a CH4/O2 rapid mixed swirl torch igniter for hybrid rocket motors

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AEROSPACE SCIENCE AND TECHNOLOGY 2020年 98卷 105666-105666页

作者： Wu, Yi zhang, Zixiang Liang, fuwen Wang, Ningfei Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China

Combustion characteristics of a rapid mixed swirl torch igniter of CH4/O-2 for hybrid rocket motors has been experimentally investigated. The igniter torch consists of four tangential slits circumferentially equispaced on the internal micro-combustion chamber allows tangential injection of O-2 gas, meanwhile the CH4 flows into the main channel and interacts with four tangential O-2 injections flow to generate a swirl mixing of CH4 and O-2. The ignitability of this swirl torch igniter was verified by large number of experiments in variation of equivalence ratio and total flowrate of CH4/O-2. The flame structure of the igniter and effect of main oxidizer injection acting as a cross flow on the flame has been investigated by using OH* and CH* chemiluminescences techniques. It is found that the torch igniter can reliably ignite instantaneously in the range of equivalence ratio 0.2-1.4 and the effect of main oxidizer injection on the flame is tiny and can be neglected. In addition, the performance of this rapid mixed swirl flame has been investigated by using a lab scaled hybrid rocket motor and compared with the same hybrid rocket motor ignited by catalytic bed. The performance of this igniter and its comparison with catalytic bed ignition will be discussed and analyzed in detail. (C) 2019 Elsevier Masson SAS. All rights reserved.

关键词： Oxygen/methane Torch igniter Hybrid rocket motor

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