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Research on Trust Model in Container-Based Cloud Service

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Computers, Materials & Continua 2018年第8期56卷 273-283页

作者： xiaolan Xie Tianwei Yuan xiao Zhou xiaochun Cheng College of Information Science and Engineering Guilin University of TechnologyGuilin541004China Guangxi Universities Key Laboratory of Embedded Technology and Intelligent Information Processing Guilin University of TechnologyGuilin541004China College of Mechanical and Control Engineering Guilin University of TechnologyGuilin541004China Department of Computer Science Middlesex UniversityLondonNW44BTUK

Container virtual technology aims to provide program independence and resource *** container enables flexible cloud *** with traditional virtualization,traditional virtual machines have difficulty in resource and expense *** container technology has the advantages of smaller size,faster migration,lower resource overhead,and higher *** container-based cloud environment,services can adopt multi-target *** paper reports research results to improve the traditional trust model with consideration of cooperation *** trust means that in a container-based cloud environment,services can be divided into multiple containers for different container *** multiple target nodes work for one service at the same time,these nodes are in a cooperation *** multi-target nodes cooperate to complete the service,the target nodes evaluate each *** calculation of cooperation trust evaluation is used to update the degree of comprehensive *** simulation results show that the cooperation trust evaluation can help solving the trust problem in the container-based cloud environment and can improve the success rate of following cooperation.

关键词： Security cloud service trust model container cooperation

基于TimeGAN增强的CNN-LSTM模型在盾构掘进地表沉降中的预测研究

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隧道建设（中英文） 2024年第11期44卷 2223-2232页

作者：郁万浩刘陕南肖晓春上海工程技术大学城市轨道交通学院上海201620 上海隧道工程有限公司上海200032

为更准确地预测小数据量下盾构法施工造成的地表沉降,提出基于TimeGAN(time series generative adversarial networks,时间序列生成对抗网络)增强的CNN(convolutional neural networks,卷积神经网络)-LSTM(long short-term memory,长短期记忆网络)盾构掘进地表沉降预测模型,并依托上海北横通道新建工程Ⅱ标盾构施工项目验证该增强模型的性能。首先,选取300环的部分施工参数、地质参数、几何参数以及地表最大沉降,对比LSTM、CNN-LSTM与TimeGAN-CNN-LSTM的性能,证明CNN-LSTM对于盾构施工环境下多参数的预测效果明显优于LSTM,TimeGAN-CNN-LSTM增强模型优于CNN-LSTM;然后,通过更改训练集及测试集的大小,对不同数据集下TimeGAN-CNN-LSTM增强模型相较CNN-LSTM的预测效果进行研究。结果表明:TimeGAN-CNN-LSTM增强模型预测效果相较CNN-LSTM模型提升显著,且当训练集与测试集比值为4~8时,提升最为显著。

关键词：盾构隧道地表沉降卷积神经网络长短期记忆网络时间序列生成对抗网络

Self-doping active sites in microbe-derived carbonaceous electrocatalysts for the oxygen reduction reaction performance

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Nano Research 2024年第8期17卷 6803-6819页

作者： xiaofeng xiao xiaochun Tian Junpeng Li Fan Yang Rui Bai Feng Zhao Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

Microorganisms are rich in heteroatoms,which can be self-doped to form active sites during pyrolysis and loaded on microbederived carbonaceous *** recent years,microbe-derived carbonaceous materials,characterized with abundant selfdoping sites,have been continuously developed as cost-effective electrocatalysts for oxygen reduction reaction(ORR).To fully unlock the catalytic potential of microbe-derived carbonaceous materials,a comprehensive analysis of catalytic sites and mechanisms for ORR is *** paper provides a summary of the ORR catalytic performance of microbe-derived carbonaceous materials reported to date,with a specific focus on the self-doping sites introduced during their pyrolytic *** highlights the mono-or co-doping sites involving nonmetallic elements such as oxygen(O),nitrogen(N),phosphorus(P),and sulfur(S)atoms,as well as covers the doping of metallic iron(Fe)atoms with various coordination configurations in microbe-derived carbonaceous *** the impact of these self-doping sites on ORR catalytic performance can guide the design of doping sites in microbe-derived carbonaceous *** approach has the potential to maximize electrocatalytic activity of microbe-derived carbonaceous materials and contributes to the development of more efficient and cost-effective carbonaceous electrocatalysts.

关键词： electrocatalysis heteroatoms self-doped single atom catalyst microbe-derived carbonaceous material

盾构隧道施工诱发地层变形特征的透明土模型试验

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公路工程 2021年第4期46卷 46-51页

作者：韩霖磊张孟喜吴惠明肖晓春包蓁上海大学土木工程系上海200444 上海隧道工程有限公司上海200032

为了更深入地了解地下盾构隧道施工引起的地层变形规律,基于透明土可视化技术及粒子图像测速技术,开展盾构隧道施工的模型试验。试验对盾构隧道开挖引发的地表沉降规律进行分析,并利用透明土可视化的优势,进一步探究土体内部位移场的分... 详细信息

为了更深入地了解地下盾构隧道施工引起的地层变形规律,基于透明土可视化技术及粒子图像测速技术,开展盾构隧道施工的模型试验。试验对盾构隧道开挖引发的地表沉降规律进行分析,并利用透明土可视化的优势,进一步探究土体内部位移场的分布特征。结果表明:试验获得的地表沉降规律与高斯分布有很好的一致性,且随着隧道埋深的增大,地表沉降值减少;土体内部地层最大沉降值与地层深度呈正相关,并得到透明砂土中土层沉降槽宽度系数沿深度变化的计算公式;隧道上方土体的水平位移沿深度方向呈现先减小后增大的特征,在水平方向表现为抛物线形式分布。

关键词：隧道工程模型试验透明土土体位移沉降槽

Nitrogen removal from summer to winter in a field pilot-scale multistage constructed wetland-pond system

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Journal of Environmental Sciences 2022年第1期34卷 249-262页

作者： Tao Wang Liping xiao Hongbin Lu Shaoyong Lu Jiaxin Li xiaochun Guo xiaoliang Zhao National Engineering Laboratory for Lake Pollution Control and Ecological Restoration State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD)State Environmental Protection Key Laboratory for Lake Pollution ControlState Key Laboratory of Environmental Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266033China College of Environmental Science and Engineering Liaoning Technical UniversityFuxin 123000China College of Water Sciences Beijing Normal UniversityBeying 100875China

A pilot-scale multistage constructed wetland-pond(MCWP)system with a"pre-ecological oxidation pond,two-stage horizontal subsurface flow constructed wetland(HSCW)and surface flow constructed wetland(SFCW)as the core and postsubmerged plant pond"as the process was used to treat actual polluted river water in the field,and the variation in nitrogen removal from summer to winter was *** results showed that the average total nitrogen(TN)removal efficiency in the MCWP was approximately 40.74%.The significant positive correlation between the daily highest temperature and the TN removal efficiency of the whole system was fitted with a nonlinear curve(R^(2)=0.7192).The TN removal load rate in the HSCWs was 2.7–3.7 times that in the *** SFCW,which had high-density plants(35 plants/m^(2)),increased the proportion of nitrogen removed by plant harvesting and microbial *** TN transformed by Iris pseudacorus *** for 54.53%in the ***,bacteria completed the nitrogen cycle in the SFCW through a variety of nitrogen removal *** research not only investigated the TN removal performance in an MCWP system but also made it possible to predict the TN removal efficiency according to the daily highest temperature from summer to winter in the field.

关键词： Multistage constructed wetland-pond Total nitrogen Air temperature change Emergent plants Polluted surface water

Research on text fault recognition for on-board equipment of a C3 train control system based on an integrated XGBoost algorithm

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Transportation Safety and Environment 2023年第4期5卷 36-44页

作者： Lili Yue Luyue Liu Maoqing Li Baodi xiao xiaochun Wu School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070GansuChina Beijing Consen Traffic Technology Co. Ltd.Beijing 101318China

The robust guarantee of train control on-board equipment is inextricably linked to the safe functioning of a high-speed train.A fault diagnostic model of on-board equipment is built utilizing the integrated learning XGBoost(eXtreme Gradient Boosting)algorithm to help technicians assess the malfunction category of high-speed train control on-board equipment accurately and *** XGBoost algorithm iterates multiple decision tree models to improve the accuracy of fault diagnosis by lifting the predicted residual and adding regular *** begin,the text features were extracted using the improved TF-IDF(Term Frequency-Inverse Document Frequency)approach,and 24 fault feature words were chosen and converted into weight word ***,considering the imbalanced fault categories in the data set,the ADASYN(Adaptive Synthetic sampling)adaptive synthetically oversampling technique was used to synthesize a few category fault ***,the data samples were split into training and test sets based on the fault text data of CTCS-3train control on-board equipment recorded by Guangzhou Railway Group maintenance *** XGBoost model was utilized to realize the automatic fault location of the test set after optimized parameter tuning through grid *** with other methods,the evaluation index of the XGBoost model was significantly *** diagnostic accuracy reached 95.43%,which verifies the effectiveness of the method in text fault diagnosis.

关键词： vehicle on-board equipment unbalanced data sets text feature extraction XGBoost model fault diagnosis

Improving thermal stability and creep resistance by Sc addition in near-αhigh-temperature titanium alloy

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Journal of Materials Science & Technology 2024年第16期183卷 1-11页

作者： Xiuyang Zhong Tongsheng Deng Wenlong xiao xiaochun Liu Zhi Liu Yucheng Yang Olanrewaju A.Ojo Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China Department of Mechanical Engineering University of ManitobaWinnipegMB R3T 5V6Canada

High-temperature titanium alloys’thermal stability and creep resistance are significant during service in high *** study systematically investigated the thermal stability and mechanical properties of Ti-6.5A1-2.5Sn-9Zr-0.5Mo-1Nb-1W-0.3Si-xSc(x,0-0.5 wt.%)at 650°*** lamellar secondaryαphase is refined and the formation of Sc_(2)O_(3)is increased with the increasing scandium(Sc)additions,which im-proves the strength of the alloy,while excessive Sc_(2)O_(3)becomes the crack source and deteriorates the *** oxygen content in the matrix is reduced by the interaction between Sc and oxygen,in-hibiting the growth of the Ti3 Al phase and improving the thermal stability of the ***,Sc accelerates the dissolution of the residualβphase and precipitation of fine,diffusely distributed ellip-soidal silicides,which strongly prevents dislocation *** enhancement of creep resistance for the Sc-containing alloy is attributed to the refined lamellar secondaryαphases,Sc_(2)O_(3)particles,Ti3 Al phase,and silicides,especially the precipitated ***,the 0.3 Sc alloy shows optimal ther-mal stability(the plasticity loss rate 17.3%)and creep resistance(steady-state creep rate 4.4×10^(-7) s^(-1)).The investigation results provide new insights into the mechanism and thermal stability improvement in high-temperature titanium alloys modified by rare earth(RE).

关键词： Titanium alloy Creep Microstructure Silicide Scandium

In vivo evaluation of renal function using diffusion weighted imaging and diffusion tensor imaging in type 2 diabetics with normoalbuminuria versus microalbuminuria

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Frontiers of Medicine 2014年第4期8卷 471-476页

作者： xiaoyan Chen Wenxia xiao Xinchun Li Jianxun He xiaochun Huang Yuyu Tan Department of Endocrinology First Affiliated Hospital of Guangzhou Medical University Guangzhou 510120 China Department of Radiology First Affiliated Hospital of Guangzhou Medical University Guangzhou 510120 China

This work aims to estimate the value of diffusion weighted imaging （DWI） and diffusion tensor imaging （DTI） in detecting early-stage kidney injury in type 2 diabetic patients with normoalbuminuria （NAU） versus microalbuminuria （MAU） prospectively. A total of 30 T2DM patients with normal kidney function were recruited and assigned to the NAU group （n = 14） or MAU group （n = 16） according to 8 h overnight urinary albuminuria excretion rate （AER） results. A contemporary cohort of health check-up recipients were included as controls （n = 12）. DWI and DTI scans were performed on bilateral kidney using SE single-shot EPI, and apparent diffusion coefficient （ADC） and fractional anisotropy （FA） of the renal parenchyma was determined from ADC and FA maps of the three groups. ADC and FA values were compared among the three groups. According to DWI with a b value of 400 s/mm^2, the MAU and NAU groups showed significantly lowered mean ADC values compared with the healthy controls （P 〈 0.01）. The mean ADC in the MAU group [（2.22± 0.07） × 10^-3 mm^2/s] was slightly lower than that of the NAU group [（2.31 ± 0.22） × 10^- 3 mm^2/s], but this difference was not statistically significant （P 〉 0.05）. The FAvalue in the MAU group was higher than that in the control group （0.45 ± 0.07 vs. 0.3±0.03, P = 0.004） but did not differ from that in the NAU group （0.42 ± 0.03）（P 〉 0.05）. ADC and FA values may be more sensitive than urine AER in reflecting early-stage kidney injury and, hence, may facilitate earlier detection and quantitative evaluation of kidney injury in T2DM patients. Combined evaluation of ADC and FA values may provide a better quantitative approach for identifying diabetic nephropathy at early disease stages.

关键词： type 2 diabetes mellitus microalbuminuria diffusion weighted imaging diffusion tensor imaging early-stagekidney injury

低渗煤层气藏气体KlinKenberg效应试验研究

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水资源与水工程学报 2011年第2期22卷 15-19页

作者：于丽艳潘一山肖晓春吕祥锋黑龙江科技学院理学院哈尔滨150027 辽宁工程技术大学力学与工程学院辽宁阜新123000

采用低渗气体渗透率测定实验方法对东北地区的低渗煤样进行了煤层气K linKenberg实验。研究了不同围压和孔隙压下低渗煤样单相气体K linKenberg渗透率对气体渗透率的影响。发现在低渗煤样中气体K linKenberg效应存在具有普遍性,并且气体... 详细信息

采用低渗气体渗透率测定实验方法对东北地区的低渗煤样进行了煤层气K linKenberg实验。研究了不同围压和孔隙压下低渗煤样单相气体K linKenberg渗透率对气体渗透率的影响。发现在低渗煤样中气体K linKenberg效应存在具有普遍性,并且气体K linKenberg效应对气体渗透率贡献较大。K linKenberg效应的发生存在一个临界孔隙压力值,在本实验中,当孔隙压力大于1 Mpa时,K linKenberg效应消失。研究了饱和水和束缚水状态下低渗煤样气体K linKenberg效应变化规律。饱和水情况下,气体K linKenberg效应完全消失。在束缚水条件下,K linKenberg效应显著,且K linKenberg效应对气体渗透率的贡献比单相气体的贡献率大,并且出现K linKenberg效应的临界孔隙压力值比单相时的临界孔隙压力值大。本文研究结果对搞清煤层气在煤层中的K linKenberg流动规律,对实现低渗储层煤层气工业化开采具有参考价值。

关键词： KlinKenberg效应低渗煤储层煤层气饱和水束缚水