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quality monitoring of real-time GNSS precise positioning service system

Geo-Spatial Information Science 2023年第1期26卷 1-15页

作者： Run Ji Xinyuan Jiang Xinghan Chen Huizhong Zhu Maorong Ge Frank Neitzel Institute of Geodesy and Geoinformation Science Technische Universität BerlinBerlinGermany German Research Center for Geosciences(GFZ) PotsdamGermany School of Geomatics Liaoning Technical University(LNTU)Fuxin 123000China

The Real-Time Global Navigation Satellite System(GNSS)Precise Positioning Service(RTPPS)is recognized as the most promising system by providing precise satellite orbit and clock correc-tions for users to achieve centimeter-level positioning with a stand-alone receiver in *** the products are available with high accuracy almost all the time,they may occasionally suffer from unexpected significant biases,which consequently degrades the positioning ***,quality monitoring at the system-level has become more and more crucial for providing a reliable GNSS *** this paper,we propose a method for the monitoring of realtime satellite orbit and clock products using a monitoring station network based on the quality Control(QC)*** satellites with possible biases are first detected based on the outliers identified by Precise Point Positioning(PPP)in the monitoring station ***,the corresponding orbit and clock parameters with temporal constraints are introduced and esti-mated through the sequential Least Square(LS)estimator and the corresponding Instantaneous User Range Errors(IUREs)can be determined.A quality indicator is calculated based on the IUREs in the monitoring network and compared with a pre-defined *** quality monitoring method is experimentally evaluated by monitoring the real-time orbit and clock products generated by GeoForschungsZentrum(GFZ),*** results confirm that the problematic satellites can be detected accurately and effectively with missed detection rate 4×10^(-6) and false alarm rate 1:2×10^(-5).Considering the quality alarms,the PPP results in terms of RMS of positioning differences with respect to the International GNSS Service(IGS)weekly solution in the north,east and up directions can be improved by 12%,10%and 27%,respectively.

关键词： Global Navigation Satellite System(GNSS) real-time precise positioning quality monitoring precise point positioning satellite product bias

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Hot metal quality monitoring system based on big data and machine learning

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Journal of Iron and Steel Research International 2023年第5期30卷 915-925页

作者： Ran Liu Zhi-feng Zhang Xin Li Xiao-jie Liu Hong-yang Li Xiang-ping Bu Jun Zhao Qing Lyu College of Metallurgy&Energy North China University of Science and TechnologyTangshan 063009HebeiChina Hangzhou Pailie Technology Co. Ltd.Hangzhou 310000ZhejiangChina Hebei Iron and Steel Group Tangshan Iron and Steel Co.Ltd.Tangshan 063009HebeiChina

The system of hot metal quality monitoring was established based on big data and machine learning using the real-time production data of a steel enterprise in China.A working method that combines big data technology with process theory was proposed for the characteristics of blast furnace production *** the data have been comprehensively processed,the independent variables that affect the target parameters are selected by using the method of multivariate feature *** use of this method not only ensures the interpretability of the input variables,but also improves the accuracy of the machine learning process and is more easily accepted by *** timely guidance on production,specific evaluation rules are established for the key quality that affects the quality of hot metal on the basis of completed predictions work and uses computer technology to build a quality monitoring system for hot *** online results show that the hot metal quality monitoring system established by relying on big data and machine learning operates stably on site,and has good guiding significance for production.

关键词： Hot metal Big data Machine learning quality monitoring Feature engineering

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PENETRATION quality EVALUATION IN ROBOTIZED ARC WELDING BASED ON SUPP0RT VECTOR MACHINE

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Chinese Journal of Mechanical Engineering 2003年第4期16卷 387-390页

作者： YeFeng SongYonglun LiDi LaiYizong ColiegeofMechanicalEngineering SouthChinaUniversityofTechnologyGuangzhou510640China CollegeofMechatronicEngineering BeijingUniversityofTechnologyBeijing100022China CollegeofMechanicalEngineering SouthChinaUniversityofTechnologyGuangzhou510640China

A quality monitoring method by means of support vector machines (SVM) forrobotized gas metal arc welding (GMAW) is introduced. Through the feature extraction of the weldingprocess signal, a SVM classifier is constructed to establish the relationship between the feature ofprocess parameters and the quality of weld penetration. Under the samples obtained from auto partswelding production line, the learning machine with a radial basis function kernel shows goodperformance. And this method can be feasible to identity defect online in welding production.

关键词： Welding quality monitoring Support vector machine

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Geochemical analysis and quality assessment of geothermal water in Gujarat,India

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Energy Geoscience 2023年第1期4卷 59-73页

作者： Vaishnavi Pandey Bhavy Chotaliya Namrata Bist Kriti Yadav Anirbid Sircar Pandit Deendayal Energy University GandhinagarGujaratIndia

Geothermal water can have a wide range of direct applications,including drinking,domestic use,irrigation and industrial *** study analyses geothermal water from Dholera,Diu,Gandhar,Kutch,Porbandar,Tulsishyam,and Unai regions located in Gujarat,India,to determine the hydrochemistry for establishing the water's suitability for drinking and irrigation *** each region,three different water samples were *** drinking purpose,total eleven water quality parameters such as pH,electrical conductivity,total dissolved solids,calcium,magnesium,sodium,potassium,chloride,sulphate,carbonate and bicarbonate were *** and Durov plots were used to understand the ionic composition and evolution of *** for irrigation,the parameters such as total dissolved solids,sodium absorption ration,electrical conductivity,and potential salinity were used for water quality *** Plot was plotted to understand the sodium and salinity hazard of *** quality index and irrigation water quality index were used to assess the water quality for making the analytical procedure *** findings indicate that the water samples from the Dholera and Diu areas had extremely high values for both the water quality index and total dissolved solids *** in these places may be appropriate for making *** the other samples show adequacy for utilization in irrigation purpose.

关键词： Geochemistry Water quality index Irrigation water quality index Geothermal quality monitoring

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学前教育专业人才培养质量监测及提升的体系建构

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幼儿教育导读（教育科学版） 2020年第7期

作者：牟映雪丁梦丽

学前教育专业人才培养质量监测体系的建构是提升高校办学质量和水平，优化教育教学计划的重要举措。当前，学前教育专业人才培养质量监测存在监测主体单一化、监测内容片面化、监测过程形式化、监测保障与反馈机制不健全等问题。为有效... 详细信息

学前教育专业人才培养质量监测体系的建构是提升高校办学质量和水平，优化教育教学计划的重要举措。当前，学前教育专业人才培养质量监测存在监测主体单一化、监测内容片面化、监测过程形式化、监测保障与反馈机制不健全等问题。为有效提升学前教育专业人才培养质量，高校应建立多维度、立体化人才质量监控评价体系，加强学前教育专业人才培养质量常态化监测，不仅要注重外部评价体系的建构和内部保障机制的确立，还需优化和完善质量监测与评价结果的反馈机制。

关键词：学前教育专业人才培养质量监测质量提升体系建构 preschool education talent development quality monitoring quality improvement system construction

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Construction and Implementation of Logistics Tracking Management System of Tropical Agricultural Products Based on Supply Chain

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Agricultural Science & Technology 2011年第9期12卷 1308-1312页

作者：徐杰刘鹏飞周正张俊杨宝祝国家农业信息化工程技术研究中心北京100097 北京派得伟业信息技术有限公司北京100097

[Objective] The paper is to construct the logistics tracking management system of tropical agricultural products based on supply chain.[Method] With tropical agricultural products in Hainan as study object,based on logistics supply chain files and electronic tag coding of agricultural products,cold chain temperature and humidity monitoring,vehicle transportation positioning,data exchange of XML Web services and role-based permission dynamic allocation,the multi-level multi-permission and multi-role logistics tracking management system of tropical agricultural products has been established.[Result] The system constructs information exchange platform for various links of logistics supply chain of tropical agricultural products,which realizes the entire quality monitoring and information tracing of agricultural products,thus enhancing the competitiveness of supply chain in company.[Conclusion] The system has good application and extension prospect.

关键词： Tropical agricultural products Supply chain Logistics tracking quality monitoring Information tracing

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