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基于复合神经网络的多源气动数据建模

西北工业大学学报 2024年第2期42卷 328-334页

作者：朱星谕梅立泉西安交通大学数学与统计学院陕西西安710049

将深度学习方法应用至气动数据建模,能够解决传统建模方法效率低、代价高的问题,具有重要的现实意义。基于复合神经网络模型对多源气动数据进行学习,利用低精度数据辅助高精度数据进行预测。与不同网络模型进行对比,验证了文中提出的复... 详细信息

将深度学习方法应用至气动数据建模,能够解决传统建模方法效率低、代价高的问题,具有重要的现实意义。基于复合神经网络模型对多源气动数据进行学习,利用低精度数据辅助高精度数据进行预测。与不同网络模型进行对比,验证了文中提出的复合神经网络在气动数据建模中表现优良,且泛化能力较好。

关键词：气动数据建模深度神经网络复合神经网络

A model test on an open-cut tunnel structure under the effect of a stick-slip normal fault

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Railway Sciences 2022年第2期1卷 169-192页

作者： Zhiqiang Zhang xingyu zhu Ronghua Wei School of Civil Engineering Southwest Jiaotong UniversityChengduChina Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengduChina

Purpose–Large displacement misalignment under the action of active faults can cause complex threedimensional deformation in subway tunnels,resulting in severe damage,distortion and misalignment.There is no developed system of fortification and related codes to follow.There are scientific problems and technical challenges in this field that have never been encountered in past research and practices.Design/methodology/approach–This paper adopted a self-designed large-scale active fault dislocation simulation loading system to conduct a similar model test of the tunnel under active fault dislocation based on the open-cut tunnel project of the Urumqi Rail Transit Line 2,which passes through the Jiujiawan normal fault.The test simulated the subway tunnel passing through the normal fault,which is inclined at 608.This research compared and analyzed the differences in mechanical behavior between two types of lining section:the opencut double-line box tunnel and the modified double-line box arch tunnel.The structural response and failure characteristics of the open-cut segmented lining of the tunnel under the stick-slip part of the normal fault were studied.Findings–The results indicated that the double-line box arch tunnel improved the shear and longitudinal bending performance.Longitudinal cracks were mainly distributed in the baseplate,wall foot and arch foot,and the crack position was basically consistent with the longitudinal distribution of surrounding rock pressure.This indicated that the longitudinal cracks were due to the large local load of the cross-section of the structure,leading to an excessive local bending moment of the structure,which resulted in large eccentric failure of the lining and formation of longitudinal cracks.Compared with the ordinary box section tunnel,the improved double-line box arch tunnel significantly reduced the destroyed and damage areas of the hanging wall and footwall.The damage area and crack length were reduced by 39 and 59.3%,respectively.This indicates that the improved double-li

关键词： Normal fault Stick-slip Open-cut tunnel Model test Failure characteristics

Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region

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Science China Earth Sciences 2019年第4期62卷 619-630页

作者： Jiansen HE Die DUAN xingyu zhu Limei YAN Linghua WANG School of Earth and Space Sciences Peking University Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

The foreshock with nascent plasma turbulence is regarded as a fascinating region to understand basic plasma physical processes, e.g., wave-particle interactions as well as wave-wave couplings. Although there have been plenty of intensive studies on this topic, some key clues about the physical processes still lack observations. A relatively comprehensive case study with some new observations is presented in this work based on the WIND spacecraft observations. In this case, upstream energetic protons were drifting at tens of Alfvén speed with respect to the background plasma protons. When looking at the magnetic wave activities, we find the co-existence of high-frequency(0.1-0.5 Hz) large-amplitude right-hand polarized(RHP) waves and lowfrequency(0.02-0.1 Hz) small-amplitude left-hand polarized(LHP) waves in the spacecraft(SC) frame. The observed anticorrelation between magnetic and velocity fluctuations along with the sunward magnetic field direction indicates that the lowfrequency LHP waves in the SC frame are in fact the sunward upstream RHP Alfvénic waves in the solar wind frame. This new observation corroborates the applicability of theories about plasma non-resonance instability and inverse cascade to the foreshock region, where the downstream high-frequency RHP parent waves are excited by the upstream energetic protons through non-resonance instability and the low-frequency RHP daughter waves are generated by the parent waves due to nonlinear parametric instability. Furthermore, enhanced downstream energetic proton fluxes are inferred to result from scattering of the upstream protons by the nascent turbulent fluctuations. Therefore, some critical clues about the newborn turbulence in the foreshock are provided in this work.

关键词： Solar wind Foreshock Wave-particle interaction Parametric instability

Analyzing Differences between Online Learner Groups during the COVID-19 Pandemic through K-Prototype Clustering

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Journal of Data Analysis and Information Processing 2022年第1期10卷 22-42页

作者： Guanggong Ge Quanlong Guan Lusheng Wu Weiqi Luo xingyu zhu College of Cyber Security Jinan University Guangzhou China College of Information Science and Technology Jinan University Guangzhou China Institute of Smart Education of Guangdong Jinan University Guangzhou China Science and Technology Department of Jinan University Guangzhou China

Online learning is a very important means of study, and has been adopted in many countries worldwide. However, only recently are researchers able to collect and analyze massive online learning datasets due to the COVID-19 epidemic. In this article, we analyze the difference between online learner groups by using an unsupervised machine learning technique, i.e., k-prototypes clustering. Specifically, we use questionnaires designed by domain experts to collect various online learning data, and investigate students’ online learning behavior and learning outcomes through analyzing the collected questionnaire data. Our analysis results suggest that students with better learning media generally have better online learning behavior and learning result than those with poor online learning media. In addition, both in economically developed or undeveloped regions, the number of students with better learning media is less than the number of students with poor learning media. Finally, the results presented here show that whether in an economically developed or an economically undeveloped region, the number of students who are enriched with learning media available is an important factor that affects online learning behavior and learning outcomes.

关键词： Online Learning K-Prototypes Clustering Economically Developed Region Data Analysis Different Groups Learning Behavior Learning Media

基于生物信息学分析探索种植体周围炎的免疫特征基因及其对免疫细胞的调控机制

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重庆医科大学学报 2024年第4期49卷 436-443页

作者：朱星宇唐菡陈陶季平重庆医科大学附属口腔医院、口腔疾病研究重庆市重点实验室、重庆市高校市级口腔生物医学工程重点实验室重庆401147

目的:基于生物信息学分析探究种植体周围炎(peri-implantitis)疾病发展中明显浸润的免疫细胞及关键的免疫相关基因。方法:整合美国国家生物技术信息中心基因表达数据库(gene expression omnibus,GEO)中的GSE106090、GSE33774及GSE57631... 详细信息

目的:基于生物信息学分析探究种植体周围炎(peri-implantitis)疾病发展中明显浸润的免疫细胞及关键的免疫相关基因。方法:整合美国国家生物技术信息中心基因表达数据库(gene expression omnibus,GEO)中的GSE106090、GSE33774及GSE57631数据集,通过单样本基因集富集分析(single-sample gene set enrichment analysis,ssGSEA)评估种植体周围炎及健康牙龈组织中的免疫细胞浸润分数,并利用套索算法(least absolute shrinkage and selection operator,LASSO)筛选关键的免疫基因。结果:整合3个数据集并去批次效应后,使用“ClusterProfiler”包实现种植体周围炎的基因本体论(gene ontology,GO)及京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)数据库的富集分析,以识别在种植体周围炎中主要上调和下调的信号通路及生物学过程。本研究进一步将差异基因与ImmPort数据库中获得的免疫相关基因取交集,通过LASSO回归筛选变量后,成功鉴定关键的疾病免疫特征性基因,包括趋化因子CC配体18(C-C motif chemokine ligand 18,CCL18)、白细胞介素-1β(interleukin 1 beta,IL-1β)、补体C3(complement C3,C3)、白细胞介素-6(interleukin 6,IL6)、利钠肽受体-3(natriuretic peptide receptor 3,NPR3)、肽酶抑制因子-3(peptidase inhibitor 3,PI3)、白细胞免疫球蛋白样受体-B3(leukocyte immunoglobulin like receptor B3,LILRB3)、富亮氨酸重复序列G蛋白偶联受体-4(leucine rich repeat containing G proteincoupled receptor 4,LGR4)。随后,本研究进行与ssGSEA免疫浸润分数的相关性分析,这些基因与种植体周围软组织内明显增加的23种免疫细胞呈现出不同程度的相关性。通过GO和KEGG数据库的富集分析,发现IL1B、IL6、CCL18、C3、LGR4、PI3、LILRB3等基因主要参与体液免疫、适应性免疫、白细胞迁移以及皮肤表皮发育等生物过程,而NPR3主要与白细胞增殖和体液水平调节等生物过程相关。结论:通过运用生物信息学的方法对免疫相关差异基因进行筛选,本研究成功识别出8个关键的免疫特征性基因,参与了种植体周围炎免疫应答及炎症响应的多个环节,并对种植体周围炎疾病背景具有较高敏感性。这些免疫特征性基因的识别为深入理解种植体周围炎的发病机制以及开发新的治疗策略提供重要的分子靶标。

关键词：种植体周围炎生物信息免疫机器学习

Sentiment Analysis of Japanese Tourism Online Reviews

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Journal of Data and Information Science 2019年第1期4卷 89-113页

作者： Chuanming Yu xingyu zhu Bolin Feng Lin Cai Lu An School of Information and Safety Engineering Zhongnan University of Economics and Law School of Information Management Wuhan University

Purpose: Online reviews on tourism attractions provide important references for potential tourists to choose tourism spots. The main goal of this study is conducting sentiment analysis to facilitate users comprehending the large scale of the reviews, based on the comments about Chinese attractions from Japanese tourism website 4 Travel.Design/methodology/approach: Different statistics-and rule-based methods are used to analyze the sentiment of the reviews. Three groups of novel statistics-based methods combining feature selection functions and the traditional term frequency-inverse document frequency(TF-IDF) method are proposed. We also make seven groups of different rulesbased methods. The macro-average and micro-average values for the best classification results of the methods are calculated respectively and the performance of the methods are shown.Findings: We compare the statistics-based and rule-based methods separately and compare the overall performance of the two method. According to the results, it is concluded that the combination of feature selection functions and weightings can strongly improve the overall performance. The emotional vocabulary in the field of tourism(EVT), kaomojis, negative and transitional words can notably improve the performance in all of three categories. The rule-based methods outperform the statistics-based ones with a narrow advantage.Research limitation: Two limitations can be addressed: 1) the empirical studies to verify the validity of the proposed methods are only conducted on Japanese languages; and 2) the deep learning technology is not been incorporated in the methods.Practical implications: The results help to elucidate the intrinsic characteristics of the Japanese language and the influence on sentiment analysis. These findings also provide practical usage guidelines within the field of sentiment analysis of Japanese online tourism reviews.Originality/value: Our research is of practicability. Currently, there are no studies that focus on the sentiment analysis of Japa

关键词： Sentiment analysis Japanese reviews Rule-based methods Statistics-based methods Tourism reviews

钢筋锈蚀作用下隧道衬砌结构力学性能劣化研究

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铁道学报 2024年第1期46卷 156-163页

作者：李永珑刘新华朱星宇唐旭张志强西南交通大学交通隧道工程教育部重点实验室四川成都610031 西南交通大学土木工程学院四川成都610031

考虑锈蚀引起的钢筋力学性能劣化、混凝土有效截面减少、两者黏结性能退化等因素,建立围岩压力作用下钢筋锈蚀隧道衬砌模型,对不同锈蚀率下衬砌结构变形、损伤、内力重分布和裂缝宽度变化进行分析。研究结果表明,锈蚀对衬砌结构各部位... 详细信息

考虑锈蚀引起的钢筋力学性能劣化、混凝土有效截面减少、两者黏结性能退化等因素,建立围岩压力作用下钢筋锈蚀隧道衬砌模型,对不同锈蚀率下衬砌结构变形、损伤、内力重分布和裂缝宽度变化进行分析。研究结果表明,锈蚀对衬砌结构各部位损伤严重程度表现为拱顶>拱肩>拱脚>拱腰>仰拱;锈蚀引起结构内力重分布,当锈蚀率由0%发展到20%时,衬砌结构临空侧受拉处弯矩逐渐减小,围岩侧受拉处的弯矩逐渐增大,衬砌轴力整体变化不大,最大变化量仅为7.53%;拱顶裂缝宽度发展最快,拱肩和拱脚次之,当锈蚀率发展到2.7%时,拱顶最大裂缝宽度已不满足耐久性要求;开裂区钢筋锈蚀对衬砌力学性能劣化起主导作用,仅开裂区钢筋发生锈蚀时,衬砌结构力学性能劣化规律与钢筋全长锈蚀情况类似,但锈蚀导致的内力变化幅度和裂缝宽度减小。

关键词：衬砌结构混凝土损伤锈蚀内力重分布裂缝宽度

考虑水转化过程的干旱区内陆河流域适宜灌溉规模

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农业工程学报 2024年第6期40卷 228-236页

作者：胡雪雪粟晓玲朱兴宇褚江东张特吴海江西北农林科技大学旱区农业水土工程教育部重点实验室杨凌712100 西北农林科技大学水利与建筑工程学院杨凌712100

农业适水发展是保障干旱区水土资源高效利用和生态健康的关键,其核心在于如何科学确定灌溉规模,进而控制农业灌溉用水量。该研究以石羊河流域为研究区,在明确非灌溉需水量的基础上,基于水均衡模型计算考虑水转化过程的不同水文年农业灌... 详细信息

农业适水发展是保障干旱区水土资源高效利用和生态健康的关键,其核心在于如何科学确定灌溉规模,进而控制农业灌溉用水量。该研究以石羊河流域为研究区,在明确非灌溉需水量的基础上,基于水均衡模型计算考虑水转化过程的不同水文年农业灌溉可用水量,并构建多目标种植结构优化模型对作物种植结构进行调整,最后改进水热平衡模型构建考虑水转化过程的旱区适宜灌溉规模计算模型,分析流域不同情景下的适宜灌溉规模。结果表明:地表水地下水联合调控下,石羊河流域丰、平、枯水年的灌溉可用水量分别为18.97亿~21.57亿、14.75亿~17.51亿、12.31亿~14.95亿m^(3);优化作物种植结构后能够以减少2.94%的经济效益实现14.13%的灌溉节水;构建的适宜灌溉规模计算模型在干旱区内陆河流域具有较好的适用性,采用该方法得到现状条件下石羊河流域丰、平、枯水年的适宜灌溉规模分别为27.73万~31.66万、21.55万~25.76万、18.01万~22.03万hm^(2),提高节水水平、调整种植结构后,流域的适宜灌溉规模有所增加。现状2020年(平水年)的实际灌溉面积高于当地水资源能够承载的临界适宜灌溉规模,需压减2.13万~6.34万hm^(2)。研究结果可在宏观层面上为决策者制定适水农业发展方案提供理论依据。

关键词：水资源灌溉模型水转化适宜规模种植结构优化石羊河流域

Highly integrated sulfur cathodes with strong sulfur/high-strength binder interactions enabling durable high-loading lithium-sulfur batteries

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Journal of Energy Chemistry 2020年第10期29卷 71-79页

作者： Arif Rashid xingyu zhu Gulian Wang Chengzhi Ke Sha Li Pengfei Sun Zhongli Hu Qiaobao Zhang Li Zhang College of Energy Soochow Institute for Energy and Materials InnovationsSoochow UniversitySuzhou 215006JiangsuChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina State Key Laboratory of Physical Chemistry of Solid Surface and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

The development of high-sulfur-loading Li-S batteries is a key prerequisite for their commercial applications.This requires to surmount the huge polarization,severe polysulfide shuttling and drastic volume change caused by electrode thickening.High-strength polar binders are ideal for constructing robust and long-life high-loading sulfur cathodes but show very weak interfacial interaction with non-polar sulfur materials.To address this issue,this work devises a highly integrated sulfur@polydopamine/highstrength binder composite cathodes,targeting long-lasting and high-sulfur-loading Li-S batteries.The super-adhesion polydopamine(PD)can form a uniform nano-coating over the graphene/sulfur(G-S)surface and provide strong affinity to the cross-linked polyacrylamide(c-PAM)binder,thus tightly integrating sulfur with the binder network and greatly boosting the overall mechanical strength/conductivity of the electrode.Moreover,the PD coating and c-PAM binder rich in polar groups can form two effective blockades against the effusion of soluble polysulfides.As such,the 4.5 mg cm−2 sulfur-loaded G-S@PD-c-PAM cathode achieves a capacity of 480 mAh g−1 after 300 cycles at 1 C,while maintaining a capacity of 396 mAh g−1 after 50 cycles at 0.2 C when the sulfur loading rises to 9.1 mg cm−2.This work provides a system-wide concept for constructing high-loading sulfur cathodes through integrated structural design.

关键词： Cross-linked high-strength polar binder Highly integrated electrode structure High-sulfur-loading Li-S battery Polydopamine nano-bonding layer Strong sulfur/binder interaction