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Remote Localization of Network-based Automatic Guided Vehicles with a Novel Quantized Set-membership Approach

INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS 2022年第8期20卷 2447-2458页

作者： Yang, Hao Zhang, Yilian Gu, wei Yang, fuwen Shanghai Maritime Univ Key Lab Transport Ind Marine Technol & Control En Shanghai 201306 Peoples R China Griffith Univ Gold Coast Sch Engn & Built Environm Southport Qld 4222 Australia

This paper investigates the remote localization problem for a network-based automatic guided vehicle (AGV) system. Considering the constraints of network bandwidth and the interference of unknown-but-bounded (UBB) noises, a novel quantized set-membership approach is proposed. First, a differential zooming strategy is designed for the quantization process of the measurement signals in order to reduce the quantization error and the negative influence of the quantization effects. Then, a remote modified set-membership filter is designed to eliminate the influence of UBB noises and obtain the optimal position state estimation ellipsoid for the considered AGV. Sufficient conditions for the existence of the set-membership filter are derived and a recursive algorithm is provided for computing the ellipsoid that guarantees to contain the true state. Finally, the remote localization performance analysis verifies the effectiveness of the proposed quantized set-membership approach for the considered AGV.

关键词： Automatic guided vehicle quantization error remote localization set-membership filtering unknown-but-bounded noises wireless communication network

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miR-7160 inhibits gastric cancer cell proliferation and metastasis by silencing SIX1

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JOURNAL OF GENETICS 2024年第2期103卷 1-10页

作者： Meng, Meng Guan, Guoxin Liu, Xingming Sun, wei Cui, Xinye Fu, Saiya Luo, fuwen Dalian Med Univ Affiliated Hosp 2 Dept Gen Surg Dalian 116027 Liaoning Peoples R China

Upregulation of homeoprotein SIX1 in gastric cancer (GC) is related to tumour proliferation and invasion. MicroRNA-7160 (miR-7160) is a homeoprotein SIX1-targeting miRNA that downregulates miR-7160, leading to cancer development. Total gastric cancer samples were collected from six patients, and relative expression levels of SIX1 mRNA and miRNAs were analysed by qRT-PCR. To evaluate the regulation of SIX1 by miR-7160, pGL3-SIX1-mut, pGL3-SIX1, and miR-7160 mimics transfected into cells using lipofectamine 2000. After transfection, proliferation and apoptosis in cultured cells were assessed using the nuclear TUNEL staining and CCK8 reagent, respectively. We demonstrated that the downregulation of miR-7160 in human gastric cancer cells is related to the upregulation of SIX1 mRNA. In gastric cancer cell lines, miR-7160 overexpression could downregulate the expression and inhibit cancer cell proliferation and growth in vitro. However, overexpression of miR-7160 did not increase gastric cancer cell apoptosis. In vitro downregulation of SIX1 decreased vimentin, N-cadherin, and other EMT-related gene expression and increased E-cadherin expression. In brief, miR-7160, by targeting SIX1, inhibits gastric cancer proliferation and cell growth in vitro, which provides an idea for introducing a new treatment option for gastric cancer.

关键词： SIX1 gene miR-7160 cell growth cell proliferation gastric cancer

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Conservation genetics and genomics of threatened vertebrates in China

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Journal of Genetics and Genomics 2018年第11期45卷 593-601页

作者： Huizhong Fan Yibo Hu Qi Wu Yonggang Nie Li Yan fuwen wei CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China

Conservation genetics and genomics are two independent disciplines that focus on using new techniques in genetics and genomics to solve problems in conservation biology. During the past two decades,conservation genetics and genomics have experienced rapid progress. Here, we summarize the research advances in the conservation genetics and genomics of threatened vertebrates(e.g., carnivorans, primates, ungulates, cetaceans, avians, amphibians and reptiles) in China. First, we introduce the concepts of conservation genetics and genomics and their development. Second, we review the recent advances in conservation genetics research, including noninvasive genetics and landscape genetics. Third, we summarize the progress in conservation genomics research, which mainly focuses on resolving genetic problems relevant to conservation such as genetic diversity, genetic structure, demographic history, and genomic evolution and adaptation. Finally, we discuss the future directions of conservation genetics and genomics.

关键词： Conservation genetics Conservation genomics Threatened species Adaptation Evolution

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Minimal Number of Sensor Nodes for Distributed Kalman Filtering

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IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS 2022年第3期52卷 1778-1786页

作者： Li, Wangyan Yang, fuwen Thiel, David, V wei, Guoliang Griffith Univ Sch Engn & Built Environm Gold Coast Campus Gold Coast Qld 4222 Australia Univ New South Wales Sch Chem Engn Sydney NSW 2052 Australia Univ Shanghai Sci & Technol Coll Sci Shanghai 200093 Peoples R China

Finding and identifying the minimal number of sensor nodes for a sensor network is one of the most basic problems for the implementation of distributed state estimators. Despite a plethora of research studied sensor networks, most of them ignored this problem or assumed the considered sensor network comes with an ideal number of sensor nodes. We revisit this problem in the current paper. To this end, the minimal number of sensor nodes problem is first formalized and a novel observability condition, namely, minimal nodes uniform observability (MNUO), is then proposed. Next, this MNUO is applied to study the stability issues of the distributed Kalman filtering algorithm. In what follows, under the condition of MNUO, conditions to ensure its stability are given and the results about the relation of the filtering performance before and after selecting the minimal number of sensor nodes are obtained. Finally, optimization solutions and an example are given to find the minimal number of sensor nodes for a sensor network.

关键词： Observability Kalman filters Stability criteria Task analysis Gold Time-varying systems Laser stability Distributed Kalman filtering minimal nodes uniform observability (MNUO) sensor networks time-varying systems

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大熊猫演化保护生物学研究

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中国科学：生命科学 2018年第10期48卷 1048-1053页

作者：魏辅文中国科学院动物研究所动物生态与保护生物学重点实验室北京100101

研究珍稀濒危动物的演化历史、濒危机制及适应性演化对策,既是保护生物学研究的重大科学问题,也是国家生态文明建设和生物多样性可持续发展的重大需求.大熊猫(Ailuropoda melanoleuca)是探讨物种濒危灭绝及适应性演化机制的理想模型.本... 详细信息

研究珍稀濒危动物的演化历史、濒危机制及适应性演化对策,既是保护生物学研究的重大科学问题,也是国家生态文明建设和生物多样性可持续发展的重大需求.大熊猫(Ailuropoda melanoleuca)是探讨物种濒危灭绝及适应性演化机制的理想模型.本研究团队率先将种群基因组学和宏基因组学等新技术引入大熊猫研究中,开拓了濒危动物种群基因组学与宏基因组学研究领域,系统阐明了大熊猫的种群历史、濒危原因、适应性演化机制与演化潜力等科学问题.以大熊猫为模型揭示了食性特化动物类群在食性转换和特化历程中如何在形态、行为、生理、遗传和肠道微生物等方面产生适应性演化的规律,积极推动了国家大熊猫放归和栖息地廊道建设工程的实施.

关键词：大熊猫保护生物学濒危过程适应性演化食性特化

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Effects of alloying elements on the interfacial segregation of bismuth in tin-based solders

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MATERIALS TODAY COMMUNICATIONS 2023年 35卷

作者： Yan, Jiasi Xiao, wei Wang, Jianwei Zhang, fuwen Li, Xiaowu He, Huijun Wang, Ligen China GRINM Grp Co Ltd State Key Lab Nonferrous Met & Proc Beijing 100088 Peoples R China GRIMAT Engn Inst Co Ltd Beijing 101407 Peoples R China Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China Northeastern Univ Sch Mat Sci & Engn Dept Mat Phys & Chem Key Lab Anisotropy & Texture MatMinist Educ Shenyang 110819 Peoples R China Beijing COMPO Adv Technol Co Ltd Beijing 101407 Peoples R China Beijing GRIPM Adv Mat Res Inst Co Ltd Beijing 101407 Peoples R China

Sn-Bi solders are potential candidates for replacing traditional lead-based solders in electronic packaging due to their low melting points, superior wettability, and mechanical properties. The grain coarsening due to the interfacial Bi segregation is a vital issue that affects the reliability of Sn-Bi solder joints. Through first-principles calculations, this study systematically revealed the effects of different alloying elements on the interfacial segregation of Bi towards Sn(100) surface. Bi tends to segregate to the top-surface of Sn due to the formation of vacancies on Sn surface. However, doping alloying elements into the Sn-Bi solders could effectively suppress the interfacial Bi segregation. The presence of elements such as Pd, Pt, and Au located at the adjacent surface layer of Bi could inhibit the Bi precipitation, by apparently increasing the segregation energies of Bi to the Sn surface. The results can be interpreted by the enhanced bond orders and charge transfer between Bi, alloying elements, and their neighboring Sn atoms. This study could provide valuable insights into the design of multi-component Sn-Bi solders with minor alloying elements doping in the future.

关键词： Sn-Bi solders Bi segregation Alloying element doping First-principles

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深海环境中微塑料与甲烷渗漏的相互作用研究（英文）

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Engineering 2023年第10期 159-167页

作者： Jing-Chun Feng Zhifeng Yang Wenliang Zhou Xingwei Feng fuwen wei Bo Li Chuanxin Ma Si Zhang Linlin Xia Yanpeng Cai Yi Wang Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological EngineeringGuangdong University of Technology Key Laboratory of Gas Hydrate Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou Center for Gas Hydrate Research Chinese Academy of Sciences

Microplastics（MPs） are important exempla of the Anthropocene and are exerting an increasing impact on Earth's carbon cycle. The huge imbalance between the MPs floating on the marine surface and those that are estimated to have been introduced into the ocean necessitates a detailed assessment of marine MP sinks. Here, we demonstrate that cold seep sediments, which are characterized by methane fluid seepage and a chemosynthetic ecosystem, effectively capture and accommodate small-scale（< 100 μm） MPs, with 16 types of MPs being detected. The abundance of MPs in the surface of the sediment is higher in methane-seepage locations than in non-seepage areas. Methane seepage is beneficial to the accumulation, fragmentation, increased diversity, and aging of MPs. In turn, the rough surfaces of MPs contribute to the sequestration of the electron acceptor ferric oxide, which is associated with the anaerobic oxidation of methane（AOM）. The efficiency of the AOM determines whether the seeping methane（which has a greenhouse effect 83 times greater than that of CO2over a 20-year period） can enter the atmosphere,which is important to the global methane cycle, since the deep-sea environment is regarded as the largest methane reservoir associated with natural gas hydrates.

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Set-membership filtering for automatic guided vehicles with unknown-but-bounded noises

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TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL 2022年第3期44卷 716-725页

作者： Yang, Hao Zhang, Yilian Gu, wei Yang, fuwen Liu, Zhiquan Shanghai Maritime Univ Key Lab Marine Technol & Control Engn Minist Commun 1550 Haigang Ave Shanghai 200135 Peoples R China Griffith Univ Gold Coast Sch Engn & Built Environm Gold Coast Australia

This paper is concerned with the state estimation problem for an automatic guided vehicle (AGV). A novel set-membership filtering (SMF) scheme is presented to solve the state estimation problem in the trajectory tracking process of the AGV under the unknown-but-bounded (UBB) process and measurement noises. Different from some existing traditional filtering methods, such as Kalman filtering method and H infinity filtering method, the proposed SMF scheme is developed to provide state estimation sets rather than state estimation points for the system states to effectively deal with UBB noises and reduce the requirement of the sensor precision. Then, in order to obtain the state estimation ellipsoids containing the true states, a set-membership estimation algorithm is designed based on the AGV physical model and S-procedure technique. Finally, comparison examples are presented to illustrate the effectiveness of the proposed SMF scheme for an AGV state estimation problem in the present of the UBB noises.

关键词： Automated guided vehicle set-membership filtering (SMF) unknown-but-bounded (UBB) noises state estimation

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Rheology of polyborazanes with various molecular structures and dynamic transformation process

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JOURNAL OF POLYMER SCIENCE 2024年第15期62卷 3528-3540页

作者： Du, Yiang Wang, Bing Wang, fuwen Li, wei Liu, Tao Zhang, Songhe Zhang, Yunbo Tan, Shixiang Wang, Yingde Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Adv Ceram Fibers & Composites Lab Changsha Peoples R China

The molecular structure of polymer precursors significantly affects their rheological properties, thermal stability, and ceramic conversion rates. For the first time, we revealed the effects of polyborazane molecular structure on rheology and molecular configuration dynamic transformation process. The systems studied are polyborazane precursors with rigid six-membered ring structures. We synthesized precursors with different molecular structures, including polyborazanes with varying degrees of branching and molecular chain flexibility, and investigated how molecular structure affects viscosity under different conditions of temperature, time, and shear rates. The results indicate that decreasing the branching degree enhances thermal stability and reduces both zero-shear viscosity and infinite-shear viscosity. Increasing the flexibility of molecular chains notably reduces infinite-shear viscosity, while having minimal impact on zero-shear viscosity and thermal stability. In conclusion, the ideal molecular structure should aim to increase the flexibility of the molecular chains while maintaining a certain degree of branching, such as a dendritic molecular configuration. By correlating viscosity data with molecular structure, we constructed a dynamic transition process of molecular chain entanglement, disentanglement, and crosslinking. This research is essential for understanding polymer rheology and its applications in industry, particularly in designing and synthesizing precursor structures for producing various ceramic fibers through Polymer-Derived Ceramics. image

关键词： dynamic transition process molecular structure polyborazane precursor polymer rheology polymer-derived ceramics

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SiC/SiO2 interface properties formed by low-temperature ozone re-oxidation annealing

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CERAMICS INTERNATIONAL 2022年第8期48卷 10874-10884页

作者： Yin, Zhipeng wei, Shengsheng Bai, Jiao Xie, weiwei Qin, fuwen Wang, Dejun Dalian Univ Technol Key Lab Intelligent Control & Optimizat Ind Equip Fac Elect Informat & Elect Engn Minist EducSch Control Sci & Engn Dalian 116024 Peoples R China Dalian Univ Technol State Key Lab Mat Modificat Laser Ion & Electron Minist Educ Dalian 116024 Peoples R China

We propose an ECR ozone plasma re-oxidation annealing (ROA) method that can introduce high-concentration and high-reactivity O atoms to eliminate defects near the SiC/SiO2 interface with low temperature (400 degrees C). This method can more effectively improve the electrical performance of SiC MOS capacitors compared with other ROA methods, including O-2, O-3 and O-2 plasma ROA methods. Secondary ion mass spectroscopy (SIMS), atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS) are performed. Results indicate that the O3P-ROA can evidently re-oxidize near-interface defects, which optimize near-interface properties, including the elemental distribution of the near-interface region and the morphology of the SiC/SiO2 interface. In addition, the effects of temperature and oxygen element on near-interface properties of SiC MOS capacitors are discussed in this paper.

关键词： Films Interfaces Electrical properties SiC SiO2 Capacitors

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