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Student Academic Performance Predictive Model Based on Dual-stream Deep Network

计算机科学 2024年第10期51卷 119-128页

作者： XIE Hui ZHANG Pengyuan DONG Zexiao YANG Huiting KANG Huan he jiangshan CheN Xueli Center for Biomedical-photonics and Molecular Imaging Xi’an Key Laboratory of Intelligent Sensing and Regulation of trans-Scale Life InformationSchool of Life Science and TechnologyXidian UniversityXi’an 710126China Engineering Research Center of Molecular and Neuro Imaging Ministry of EducationXi’an 710126China Innovation Center for Advanced Medical Imaging and Intelligent Medicine Guangzhou Institute of TechnologyXidian UniversityGuangzhou 510550China

Blended teaching is one of the essential teaching methods with the development of information *** a learning effect evaluation model is helpful to improve students’academic performance and helps teachers to better implement course ***,a lack of evaluation models for the fusion of temporal and non-temporal behavioral data leads to an unsatisfactory evaluation *** meet the demand for predicting students’academic performance through learning behavior data,this study proposes a learning effect evaluation method that integrates expert perspective indicators to predict academic performance by constructing a dual-stream network that combines temporal behavior data and non-temporal behavior data in the learning *** this paper,firstly,the Delphi method is used to analyze and process the course learning behavior data of students and establish an effective evaluation index system of learning behavior with universality;secondly,the Mann-Whitney U-test and the complex correlation analysis are used to analyze further and validate the evaluation indexes;and lastly,a dual-stream information fusion model,which combines temporal and non-temporal features,is *** learning effect evaluation model is built,and the results of the mean absolute error(MAE)and root mean square error(RMSE)indexes are 4.16 and 5.29,*** study indicates that combining expert perspectives for evaluation index selection and further fusing temporal and non-temporal behavioral features that for learning effect evaluation and prediction is rationality,accuracy,and effectiveness,which provides a powerful help for the practical application of learning effect evaluation and prediction.

关键词： Blended teaching Expert perspective indicators Two-stream information fusion model

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瑞马唑仑用于重症监护病房俯卧位通气深镇静诱导的半数有效剂量

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中国急救医学 2024年第2期44卷 122-127页

作者：赵洁玉郑祥德刘成何江山周文来达州市中心医院重症医学科四川达州635000

目的测定瑞马唑仑用于重症监护病房(ICU)患者俯卧位通气深镇静诱导的半数有效剂量(ED50)。方法选择2022年11月至2023年7月达州市中心医院收入ICU的早期中、重度急性呼吸窘迫综合征(ARDS)行俯卧位通气深镇静患者45例,给药舒芬太尼0.4μg... 详细信息

目的测定瑞马唑仑用于重症监护病房(ICU)患者俯卧位通气深镇静诱导的半数有效剂量(ED50)。方法选择2022年11月至2023年7月达州市中心医院收入ICU的早期中、重度急性呼吸窘迫综合征(ARDS)行俯卧位通气深镇静患者45例,给药舒芬太尼0.4μg/kg使重症监护疼痛观察工具(CPOT)评分达0~1分后,使用瑞马唑仑诱导镇静,镇静达标后开始俯卧位通气。瑞马唑仑诱导镇静的剂量由改良Dixon序贯试验法确定,根据预试验确定瑞马唑仑的起始剂量为0.2 mg/kg,剂量梯度为0.025 mg/kg。镇静达标定义为给药后3 min内Richmond躁动-镇静评分(RASS)≤-4分且光谱熵(SE)≤50。但如俯卧位通气3 min之内出现明显的体动、皱眉、流泪、呛咳和吞咽等反应且RASS>-4分或SE>50,仍表示镇静不理想。镇静达标且理想则下一例患者在上一例的给药剂量基础上降低一个梯度,若镇静未达标或不理想,下一例给药剂量升高一个梯度。连续出现10次交叉后终止研究。运用Probit回归分析法,计算出瑞马唑仑的ED50和95%有效剂量(ED95)。记录给药前后心率(HR)、呼吸频率(RR)、平均动脉压(MAP)、血氧饱和度(SpO_(2))及俯卧位通气中心动过缓和恶心呕吐等不良反应的发生情况。结果瑞马唑仑用于ICU患者俯卧位通气深镇静诱导的ED50为0.228 mg/kg(95%CI 0.208~0.248),ED95为0.365 mg/kg(95%CI 0.299-0.518)。与舒芬太尼镇痛达标后(T_(1))比较,瑞马唑仑诱导镇静后2 min(T_(2))和俯卧位通气后2 min(T_(3))各时间点的血氧饱和度(SpO_(2))差异无统计学意义(P>0.05);T_(3)时HR、MAP及RR较T_(1)和T_(2)时均有下降(P<0.05),但下降幅度在20%以内;T_(2)和T_(3)时镇静深度指标RASS及SE比T_(1)时显著下降(P<0.01)。诱导期间3例患者出现低血压,给予麻黄碱有效;2例患者出现心动过缓,给予阿托品有效,无其他不良反应。结论瑞马唑仑用于ICU患者俯卧位通气深镇静诱导的ED50为0.228 mg/kg,ED95为0.365 mg/kg,镇静效果确切,呼吸循环影响较小,不良反应少。

关键词：俯卧位通气瑞马唑仑半数有效剂量(ED50) 95%有效剂量(ED95) 深镇静 Richmond躁动-镇静评分光谱熵

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Effects of acupuncture at Sibai(ST 2) acupoint on neuronal discharge in rat nucleus tractus solitarius

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Neural Regeneration Research 2009年第4期4卷 286-290页

作者： Xiaorong Chang Jie Yan Junfeng he jiangshan Li Jianhua Liu Chao Wang Key Department of Acupuncture Moxibustion and Massage Key Laboratory of Meridians- Vessles Zang Fu Organs Traditional Chinese Medicine University of Hunan & Key Laboratory of Acupuncture Moxibustion and Biological Information of Hunan Higher Education Institutes Changsha 410007 Hunan Province China

BACKGROUND： Electrophysiology can prove the integration of afferent information from the stomach meridian of Foot-Yangming in the nucleus tractus solitarius （NTS） and objectively describe the specific association between meridian vessels and Zang Fu organs. OBJECTIVE： To investigate the effects of afferent information from acupuncture at Sibai （ST 2） acupoint on neuronal discharge in rat NTS. DESIGN, TIME AND SETFING： A randomized, controlled, animal experiment was performed at the Key Laboratory of Meridian-Vessels and Zang Fu Organs, Traditional Chinese Medicine University of Hunan, State Administration of Traditional Chinese Medicine, and Key Laboratory of Acupuncture, Moxibustion, and the Biological Information of Hunan Higher Education Institutes, between December 2005 and October 2008. MATERIALS： A total of 52 Sprague Dawley rats, of either gender, aged 4 months, were included in this study. Acupuncture needles of 0.32 mm （diameter） x 40 mm （length） were used. METHODS： An extracellular recording protocol was applied. The Sibai （ST 2） acupoint in the stomach meridian of Foot-Yangming was used as an acupuncture point （acupoint）. Simultaneously, Dicang （ST 4） and Neiting （ST 44） acupoints in the stomach meridian of Foot-Yangming, Quanliao （S118） acupoint in the small intestine meridian of Hand-Taiyang, and a non-acupoint lateral to Sibai （ST 2） acupoint, were selected as controls. The Sibai （ST 2） acupoint was stimulated for 30 seconds by hand acupuncture through twirling and rotating, to determine the neurons responding to body surface stimulation in the NTS. MAIN OUTCOME MEASURES： Frequency of responding NTS neurons after acupuncture at four acupoints including Sibai （ST 2）, Dicang （ST 4）, Neiting （ST 44） and Quanliao （SI 18） and one non-acupoint. RESULTS： The frequency of responding NTS neurons was significantly higher after acupuncture at Sibaithan at control sites including the Dicang （ST 4）, Neiting （ST 44） and Quanliao （S118） acupoints and at the non-acupo

关键词： Sibai (ST 2) acupoint nucleus tractus solitarius neuronal discharge

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艾滋病病毒流行重组毒株CRF01_AE及其影响

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中国艾滋病性病 2024年第1期30卷 79-83页

作者：李斯斯李康 Abdur Rashid 贺江珊王沛葭刘茂顺冯毅邵一鸣广西艾滋病防治研究重点实验室公共卫生学院广西医科大学南宁530021 中国疾病预防控制中心性病艾滋病预防控制中心北京102206 南开大学天津300071 北京师范大学北京100875

CRF01_AE作为HIV最主要的流行重组毒株,在全球范围长时序演变,形成区域间的流行特征,构成特色且独立的流行与传播模式,本文从其起源、遗传多样性、流行特征及其对诊断和治疗延迟、疾病进程、治疗效果影响等方面进行综述,阐释CRF01_AE及... 详细信息

CRF01_AE作为HIV最主要的流行重组毒株,在全球范围长时序演变,形成区域间的流行特征,构成特色且独立的流行与传播模式,本文从其起源、遗传多样性、流行特征及其对诊断和治疗延迟、疾病进程、治疗效果影响等方面进行综述,阐释CRF01_AE及时监测对遏制HIV区域间和全球蔓延的作用。

关键词：艾滋病亚型重组流行病学

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非团聚二钼酸铵生产钼转化率提升研究与改进

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四川化工 2024年第5期27卷 40-43,47页

作者：郭磊雷宁宁何江山徐芳苓魏改丽王露金堆城钼业股份有限公司陕西渭南714000

钼转化率是制约钼化工行业发展的技术难题。通过对非团聚二钼酸铵生产工艺的深入分析和优化探究,运用数据比对、实验验证等手段,进一步提高了钼的转化率。此外,提出了新的工艺流程改造方案,提升钼转化率约6%,改造方式简单易行、效果显... 详细信息

钼转化率是制约钼化工行业发展的技术难题。通过对非团聚二钼酸铵生产工艺的深入分析和优化探究,运用数据比对、实验验证等手段,进一步提高了钼的转化率。此外,提出了新的工艺流程改造方案,提升钼转化率约6%,改造方式简单易行、效果显著且改造成本较低,可为钼化工生产工艺的优化和钼产品质量水平的提高提供有力的支撑和指导。

关键词：二钼酸铵水洗废水氨浸渣工艺改造钼转化率

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Novel Partitioned Time-Stepping Algorithms for Fast Computation of Random Interface-Coupled Problems with Uncertain Parameters

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Numerical Mathematics(Theory,Methods and Applications) 2024年第1期17卷 145-180页

作者： Yizhong Sun jiangshan Wang Haibiao Zheng School of Mathematical Sciences East China Normal UniversityShanghaiChina School of Mathematical Sciences Ministry of Education Key Laboratory of Mathematics and Engineering ApplicationsShanghai Key Laboratory of PMMPEast China Normal UniversityShanghaiChina

The simulation of multi-domain,multi-physics mathematical models with uncertain parameters can be quite demanding in terms of algorithm design and com-putation *** main objective in this paper is to examine a physical interface coupling between two random dissipative systems with uncertain *** to the complexity and uncertainty inherent in such interface-coupled problems,un-certain diffusion coefﬁcients or friction parameters often arise,leading to consid-ering random *** employ Monte Carlo methods to produce independent and identically distributed deterministic heat-heat model samples to address ran-dom systems,and adroitly integrate the ensemble idea to facilitate the fast calcu-lation of these *** achieve unconditional stability,we introduce the scalar auxiliary variable(SAV)method to overcome the time constraints of the ensemble implicit-explicit ***,for a more accurate and stable scheme,the ensemble data-passing algorithm is raised,which is unconditionally stable and convergent without any auxiliary *** algorithms employ the same co-efﬁcient matrix for multiple linear systems and enable easy parallelization,which can signiﬁcantly reduce the computational ***,numerical experiments are conducted to support the theoretical results and showcase the unique features of the proposed algorithms.

关键词： Scalar auxiliary variable,ensemble algorithm,random interface-coupled problems,implicit-explicit partitioned method,data-passing partitioned method

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Boosting the self-trapped exciton emission in vacancy-ordered double perovskites via supramolecular assembly

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Chinese Journal of Structural Chemistry 2024年第6期43卷 1-2页

作者： Xingwen Cheng Haoran Ren jiangshan Luo Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China

All-inorganic 3D lead-free vacancy-ordered double perovskites(DPs)in the A_(2)MX_(6)phase have garnered significant attention in the fields of photovoltaics and light-emitting diodes(LED)due to their exceptional optoelectronic properties[1].These properties encompass a high optical absorption coefficient,tunable bandgap,and long carrier diffusion dis-tance.

关键词： optoelectronic vacancy double

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Tensile strength behavior of cement-stabilized dredged sediment reinforced by polypropylene fiber

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Frontiers of Structural and Civil Engineering 2024年第3期18卷 380-392页

作者： Lei LANG jiangshan LI Xin CheN Lijun HAN Ping WANG State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicChinese Academy of SciencesWuhan 430071China Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

This study evaluated the feasibility of using polypropylene fiber(PF)as reinforcement in improving tensile strength behavior of cement-stabilized dredged sediment(CDS).The effects of cement content,water content,PF content and length on the tensile strength and stress–strain behavioral evolutions were evaluated by conducting splitting tensile strength ***,the micro-mechanisms characterizing the tensile strength behavior inside PF-reinforced CDS(CPFDS)were clarified via analyzing macro failure and microstructure *** results indicate that the highest tensile strengths of 7,28,60,and 90 d CPFDS were reached at PF contents of 0.6%,1.0%,1.0%,and 1.0%,exhibiting values 5.96%,65.16%,34.10%,and 35.83%higher than those of CDS,***,3 mm,PF of showed the best reinforcement *** CPFDS exhibited obvious tensile strain-hardening characteristic,and also had better ductility than *** mix factor(C_(C)^(a)/C_(w)^(b))and time parameter(q_(t0)(t))of CDS,and the reinforcement index(k_(t-PF))of CPFDS were used to establish the tensile strength prediction models of CDS and CPFDS,considering multiple *** PF“bridge effect”and associated cementation-reinforcement coupling actions inside CPFDS were mainly responsible for tensile strength behavior *** key findings contribute to the use of CPFDS as recycled engineering soils.

关键词： dredged sediment chemical stabilization fiber reinforcement splitting tensile strength micro-mechanisms

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Coupling effect of cement-stabilization and biopolymer-modification on the mechanical behavior of dredged sediment

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3284-3298页

作者： Lei Lang jiangshan Li Xiao Huang Ping Wang Wei Zhang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan430071China University of Chinese Academy of Sciences Beijing100049China

Nowadays,biopolymer stabilization as a promising eco-friendly approach in soft ground improvement has attracted wide ***,the feasibility of using biopolymer as a green additive of cementstabilized dredged sediment(CDS)with high water content is still *** this study,guar gum(GG)and xanthan gum(XG)were adopted as typical biopolymers,and a series of unconfined compressive strength(UCS),splitting tensile strength(STS)and scanning electron microscopy(SEM)tests were performed to evaluate the mechanical and microstructural properties of XG-and GG-modified CDSs considering several factors including biopolymer modification,binderesoil ratio and wateresolid ***,the micro-mechanisms revealing the evolutions of mechanical properties of biopolymermodified CDS were *** results indicate that the addition of XG can effectively improve the strength of CDS,while the GG has a side *** XG content of 9%was recommended,which can improve the 7 d-and 28 d-UCSs by 196%and 51.8%,together with the 7 d-and 28 d-STSs by 118.3%and 42.2%,*** the binderesoil ratio or decreasing the wateresolid ratio significantly improved the strength gaining but aggravated the brittleness characteristics of *** XG to CDS contributed to the formation of microstructure with more compactness and higher cementation degrees of ordinary Portland cement(OPC)-XG-stabilized DS(CXDS).The micro-mechanism models revealing the interactions of multiple media including OPC cementation,biopolymer film bonding and bridging effects inside CXDS were *** key findings confirm the feasibility of XG modification as a green and high-efficiency mean for improving the mechanical properties of CDS.

关键词： Dredged sediment(DS) Stabilization Biopolymer modification Mechanical properties Micro-mechanism

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Hybrid model for BOF oxygen blowing time prediction based on oxygen balance mechanism and deep neural network

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 106-117页

作者： Xin Shao Qing Liu Zicheng Xin jiangshan Zhang Tao Zhou Shaoshuai Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Engineering Research Center of MES Technology for Iron&Steel Production Ministry of EducationBeijing 100083China Laiwu Iron and Steel Group Yinshan Section Steel Co. Ltd.Jinan 271104China

The amount of oxygen blown into the converter is one of the key parameters for the control of the converter blowing process,which directly affects the tap-to-tap time of converter. In this study, a hybrid model based on oxygen balance mechanism (OBM) and deep neural network (DNN) was established for predicting oxygen blowing time in converter. A three-step method was utilized in the hybrid model. First, the oxygen consumption volume was predicted by the OBM model and DNN model, respectively. Second, a more accurate oxygen consumption volume was obtained by integrating the OBM model and DNN model. Finally, the converter oxygen blowing time was calculated according to the oxygen consumption volume and the oxygen supply intensity of each heat. The proposed hybrid model was verified using the actual data collected from an integrated steel plant in China, and compared with multiple linear regression model, OBM model, and neural network model including extreme learning machine, back propagation neural network, and DNN. The test results indicate that the hybrid model with a network structure of 3 hidden layer layers, 32-16-8 neurons per hidden layer, and 0.1 learning rate has the best prediction accuracy and stronger generalization ability compared with other models. The predicted hit ratio of oxygen consumption volume within the error±300 m^(3)is 96.67%;determination coefficient (R^(2)) and root mean square error (RMSE) are0.6984 and 150.03 m^(3), respectively. The oxygen blow time prediction hit ratio within the error±0.6 min is 89.50%;R2and RMSE are0.9486 and 0.3592 min, respectively. As a result, the proposed model can effectively predict the oxygen consumption volume and oxygen blowing time in the converter.

关键词： basic oxygen furnace oxygen consumption oxygen blowing time oxygen balance mechanism deep neural network hybrid model

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