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Research on fault time prediction method for high speed rail BTM unit based on multi method interactive validation

High-Speed Railway 2024年第3期2卷 164-171页

作者： Limin Fu junqiang gou Chao Sun Hanrui Li Wei Liu School of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China China Railway Signal and Communication Research and Design Institute Group Co Ltd. Beijing 100089China

The Balise Transmission Module(BTM)unit of the on-board train control system is a crucial *** to its unique installation position and complex environment,this unit has a higher fault rate within the on-board train control *** conduct fault prediction for the BTM unit based on actual fault data,this study proposes a prediction method combining reliability statistics and machine learning,and achieves the fusion of prediction results from different dimensions through multi-method interactive ***,a method for predicting equipment fault time targeting batch equipment is *** method utilizes reliability statistics to construct a model of the remaining faultless operating time distribution considering uncertainty,thereby predicting the remaining faultless operating probability of the BTM ***,considering the complexity of the BTM unit’s fault mechanism,the small sample size of fault cases,and the potential presence of multiple fault features in fault text records,an individual-oriented fault prediction method based on Bayesian-optimized Gradient Boosting Regression Tree(Bayes-GBRT)is *** method achieves better prediction results compared to linear regression algorithms and random forest regression algorithms,with an average absolute error of only 0.224 years for predicting the fault time of this type of ***,a multi-method interactive validation approach is proposed,enabling the fusion and validation of multi-dimensional *** results indicate that the predicted fault time and the actual fault time conform to a log-normal distribution,and the parameter estimation results are basically consistent,verifying the accuracy and effectiveness of the prediction *** above research findings can provide technical support for the maintenance and modification of BTM units,effectively reducing maintenance costs and ensuring the safe operation of high-speed railway,thus having practical engineering va

关键词： High speed rail BTM unit Remaining faultless operating time Machine learning Multi method interactive verification

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HPLC法同时测定人血浆中利奈唑胺及其代谢物PNU-142300和PNU-142586的血药浓度

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中国药学杂志 2024年第8期59卷 732-737页

作者：苟军强李倩周晓丽范宁李萌王晓锋尹东锋石河子大学药学院新疆石河子832003 新疆军区总医院药剂科乌鲁木齐830000

目的建立高效液相色谱法同时测定人血浆中利奈唑胺及其主要代谢物PNU-142300和PNU-142586浓度,用于危重症患者血药浓度监测。方法以氯霉素为内标,酸化乙腈(含体积分数0.1%甲酸)为蛋白沉淀剂,双溶剂流动相为A乙腈、B枸橼酸(0.1 mol·L^(-... 详细信息

目的建立高效液相色谱法同时测定人血浆中利奈唑胺及其主要代谢物PNU-142300和PNU-142586浓度,用于危重症患者血药浓度监测。方法以氯霉素为内标,酸化乙腈(含体积分数0.1%甲酸)为蛋白沉淀剂,双溶剂流动相为A乙腈、B枸橼酸(0.1 mol·L^(-1))-磷酸氢二钠(0.2 mol·L^(-1))缓冲溶液(pH 3.0),色谱柱为Diamonsil C_(18)柱(4.6 mm×250 mm,5μm),流速0.5 mL·min^(-1),梯度洗脱,检测波长254 nm,柱温30℃,进样量20μL。结果利奈唑胺在0.5~40μg·mL^(-1)的浓度范围内线性关系良好(r=0.9999),定量下限为0.5μg·mL^(-1),检测限为0.1μg·mL^(-1);PNU-142300和PNU-142586在0.5~20μg·mL^(-1)的浓度范围内线性关系良好(r=0.9998和r=0.9996),定量下限为0.5μg·mL^(-1),检测限为0.2μg·mL^(-1)。10例重症患者中肾功能不全患者血浆利奈唑胺及代其谢物PNU-142300和PNU-142586暴露量分别为肾功能正常患者的3.62、1.88和2.30倍,且利奈唑胺及其代谢物暴露量与血小板减少和贫血间具有较强的相关性。结论该方法操作简便,灵敏、准确度高,可用于重症患者利奈唑胺及其代谢物PNU-142300和PNU-142586临床血药浓度监测和不良反应相关性研究。

关键词：利奈唑胺 PNU-142300 PNU-142586 高效液相色谱法

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利奈唑胺相关血小板减少风险预测模型构建及应用

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中国药业 2024年第13期33卷 59-64页

作者：苟军强王晓锋李倩杨善鹏尹东锋石河子大学药学院新疆石河子832003 中国人民解放军新疆军区总医院新疆乌鲁木齐830000

目的建立利奈唑胺相关血小板减少的联合因素风险预测模型,根据联合因素风险阈值预测初次治疗药物监测(TDM)的时间。方法选取新疆某三甲医院2017年1月至2022年1月使用利奈唑胺治疗感染性疾病的患者149例,根据是否发生血小板减少分为血小... 详细信息

目的建立利奈唑胺相关血小板减少的联合因素风险预测模型,根据联合因素风险阈值预测初次治疗药物监测(TDM)的时间。方法选取新疆某三甲医院2017年1月至2022年1月使用利奈唑胺治疗感染性疾病的患者149例,根据是否发生血小板减少分为血小板减少组(61例)和非血小板减少组(88例),采用Logistic回归分析法筛选利奈唑胺相关血小板减少的危险因素,建立联合因素的风险预测模型。根据联合因素风险阈值预测初次TDM时间,并进行验证。结果61例(40.94%)患者发生了血小板减少症,疗程不低于12 d[OR=6.620,95%CI(2.338,18.74),P<0.001],估算肾小球滤过率不超过60 mL/(min·1.73 m^(2))[OR=7.352,95%CI(1.723,31.37),P=0.007],内生肌酐清除率(CCr)不超过60 mL/min[OR=4.464,95%CI(1.349,14.77),P=0.014]为利奈唑胺相关血小板减少的独立危险因素。联合因素(疗程和CCr)的受试者工作特征(ROC)曲线下面积(AUC)为0.9042,95%CI为(0.8566,0.9519),敏感度为86.89%,特异度为80.68%,临界值为4.871;确定联合因素的风险阈值为5.0。结论所建立的联合因素风险预测模型具有较好的诊断效能,可用于反向预测初次TDM的时间,提高利奈唑胺临床应用的有效性和安全性。

关键词：利奈唑胺血小板减少危险因素治疗药物风险监测预测模型

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Microstructural landscape of amorphous carbon

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National Science Review 2024年第5期11卷 94-95页

作者： Huiyang gou Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Due to its diverse bonding hybridization forms (sp, sp2and sp3), amorphous carbon exhibits multifaceted properties and important application prospects, which have aroused extensive research interest[1–5]. In amorphous solids, some degree of atomic short-to medium-range order is thought to be ubiquitous, and the recent synthesis of new amorphous carbon has further increased our understanding of the atomic disorder in materials [4].

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Optimizing urban block morphologies for net-zero energy cities:Exploring photovoltaic potential and urban design prototype

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Building Simulation 2024年第4期17卷 607-624页

作者： Xiaotian Geng Dong Xie Zhonghua gou School of Urban Design Wuhan UniversityWuhanChina

The morphology of urban areas plays a crucial role in determining solar potential,which directly affects photovoltaic capacity and the achievement of net-zero *** study focuses on the City of Melbourne to investigate the utilization of solar energy across different urban densities and proposes optimized *** analysis encompasses blocks with diverse population densities,examining medium and high-density *** utilizing a multi-objective genetic optimization approach,the urban morphology of these blocks is *** findings indicate that low-density blocks exhibit photovoltaic potential ranging from 1 to 6.6 times their total energy *** and high-density blocks achieve photovoltaic potential levels approximately equivalent to 40%-85%of their overall energy ***,significant variations in photovoltaic potential are observed among different urban forms within medium and high-density ***“elevated corners with central valley”prototype is proposed as an effective approach,enhancing the overall photovoltaic potential by approximately 14%.This study introduces novel analytical concepts,shedding light on the intricate relationship between urban morphologies and photovoltaic potential.

关键词： net-zero energy solar energy urban density urban morphology multi-objective optimization photovoltaic potential

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Impact of COVID-19 on the energy consumption of commercial buildings:A case study in Singapore

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Energy and Built Environment 2024年第3期5卷 364-373页

作者： Senhong Cai Zhonghua gou School of Urban Design Wuhan UniversityWuhanChina

Numerous studies have demonstrated that commercial activities have significantly reduced during COVID-19,while there are few studies disclosing the consequent impacts on the energy consumption of commercial *** study explores the changes in energy consumption of different types of commercial buildings in Sin-gapore under the impact of the pandemic,using commercial building energy performance data from 2017 to 2020(n=540).The sampled buildings include 93 hotel buildings,303 office buildings,106 retail buildings,and 38 mixed *** analysis mainly used linear regression and paired sample *** results showed that relative to 2019,the mean energy use intensity(EUI)of sampled commercial buildings decreased by 56.77 kWh/m^(2)in the pandemic year(2020),a plunge of 19.9%.The extent to which the EUI of each type of commercial building is affected by the pandemic is found as:mixed development>retail>office>*** study also identi-fied the factors that significantly influenced the EUI of commercial buildings before and during the *** results of the study complement existing knowledge about the factors influencing energy consumption in com-mercial buildings by considering the impact of the pandemic and furthermore contribute to the improvement of energy management in commercial buildings by providing directions for building energy efficiency approaches.

关键词： Commercial buildings Energy consumption Energy use intensity Impact of COVID-19 Influential factors

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A Tightly Coupled Dipole Array with Diverse Element Reflection Phases for RCS Reduction

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Chinese Journal of Electronics 2024年第2期33卷 449-455页

作者： Yuewen gou Yikai CHEN Shiwen YANG University of Electronic Science and Technology of China

This paper proposes a novel low scattering tightly coupled dipole array(TCDA), aiming to reduce the radar cross section(RCS) of phased antenna arrays under a certain oblique incident wave. First, we build three types of antenna elements that exhibit similar radiation characteristics but diverse reflection phase differences based on the proposed theoretical analysis. The required reflection phase difference is achieved by using different dielectric superstrates for each antenna element. Then, by arranging the three types of subarrays next to each other, a low scattering TCDA(8 × 9) is designed. Meanwhile, a reference antenna array with a single type of antenna element is also constructed. To demonstrate the effectiveness of the proposed RCS reduction technique, simulated and measured results of the reference and proposed antenna array are compared. Both antenna arrays operate over the 6–18 GHz frequency band and can scan up to ±45° in the E-/H-planes. However, the proposed antenna array achieves a significant monostatic RCS reduction over 8–12 GHz, with a maximum reduction value of 7.55 d B. It indicates that this diverse element reflection phase technique is a good candidate for wideband RCS reduction.

关键词： Antenna measurements Phased arrays Dipole antennas Antenna theory Scattering Reflector antennas Reflection

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Facile synthesis of composite polyferric magnesium-silicate-sulfate coagulant with enhanced performance in water and wastewater

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 574-584页

作者： Xiangtao Huo Rongxia Chai Lizheng gou Mei Zhang Min Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The coagulation process is a widely applied technology in water and wastewater *** composite polyferric mag-nesium-silicate-sulfate(PFMS)coagulants were synthesized using Na_(2)SiO_(3)·9H_(2)O,Fe_(2)(SO_(4))_(3),and MgSO_(4) as raw materials in this *** effects of aging time,Fe:Si:Mg,and OH:M molar ratios(M represents the metal ions)on the coagulation performance of the as-pre-pared PFMS were systematically investigated to obtain optimum *** results showed that PFMS coagulant exhibited good co-agulation properties in the treatment of simulated humic acid-kaolin surface water and reactive dye *** the molar ratio was controlled at Fe:Si:Mg=2:2:1 and OH:M=0.32,the obtained PFMS presented excellent stability and a high coagulation *** removal efficiency of ultraviolet UV254 was 99.81%,and the residual turbidity of the surface water reached 0.56 NTU at a dosage of 30 mg·L^(-1).After standing the coagulant for 120 d in the laboratory,the removal efficiency of UV254 and residual turbidity of the surface wa-ter were 88.12%and 0.68 NTU,respectively,which accord with the surface water treatment *** addition,the coagulation performance in the treatment of reactive dye wastewater was greatly improved by combining the advantages of magnesium and iron *** with polyferric silicate-sulfate(PFS)and polymagnesium silicate-sulfate(PMS),the PFMS coagulant played a better decolor-ization role within the pH range of 7-13.

关键词： polyferric-magnesium-silicate-sulfate composite coagulants water and wastewater excellent stability high coagulation ef-ficiency decolorization

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Frontiers of Computer Science 2024年第3期18卷 227-229页

作者： Qianwen gou Yunwei DONG YuJiao WU Qiao KE School of Computer Science Northwestern Polytechnical UniversityXi’an 710129China School of Mathematics and Statistics Northwestern Polytechnical UniversityXi’an 710129China

1 Introduction Program retrieval aims to enable the flexible retrieval of program snippets based on a natural language query,significantly accelerating software development *** shows that over 60%of developers perform program retrieval daily[1].Recent years have witnessed an increasing interest in deep learning-based program retrieval,which aims to construct embedding representations for program snippets and ***,the distribution of natural languages and programs is inconsistent,resulting in a semantic *** critical challenge is to bridge the semantic gap between the programming language and natural language,and accurately measure their similarity.

关键词： semantic similarity retrieval

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MMCo:using multimodal deep learning to detect malicious traffic with noisy labels

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Frontiers of Computer Science 2024年第1期18卷 239-241页

作者： Qingjun YUAN Gaopeng gou Yuefei ZHU Yongjuan WANG Strategic Support Force Information Engineering University Zhengzhou 450001China Institute of Information Engineering Chinese Academy of SciencesBeijing 100093China

1 Introduction The success of a deep learning-based network intrusion detection systems(NIDS)relies on large-scale,labeled,realistic traffic[1,2].However,automated labeling of realistic traffic,such as by sandbox and rule-based approaches,is prone to errors[3],which in turn affects deep learning-based *** effective schemes for learning with noisy labels(LNL)have been proposed,among which the use of parallel networks for sample selection during training has been shown to be *** is argued that parallel networks can discriminate samples from different perspectives,thus adding additional information to the training *** centerpiece is maintaining disagreement of networks.

关键词： network networks modal

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