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Cloud Resource Integrated Prediction Model Based on Variational Modal Decomposition-Permutation Entropy and LSTM

Computer Systems Science & Engineering 2023年第11期47卷 2707-2724页

作者： Xinfei Li Xiaolan Xie yigang tang Qiang Guo Guangxi Key Laboratory of Embedded Technology and Intelligent System Guilin541006China School of Information Science and Engineering Guilin University of TechnologyGuilin541006China

Predicting the usage of container cloud resources has always been an important and challenging problem in improving the performance of cloud resource clusters.We proposed an integrated prediction method of stacking container cloud resources based on variational modal decomposition(VMD)-Permutation entropy(PE)and long short-term memory(LSTM)neural network to solve the prediction difficulties caused by the non-stationarity and volatility of resource data.The variational modal decomposition algorithm decomposes the time series data of cloud resources to obtain intrinsic mode function and residual components,which solves the signal decomposition algorithm’s end-effect and modal confusion problems.The permutation entropy is used to evaluate the complexity of the intrinsic mode function,and the reconstruction based on similar entropy and low complexity is used to reduce the difficulty of modeling.Finally,we use the LSTM and stacking fusion models to predict and superimpose;the stacking integration model integrates Gradient boosting regression(GBR),Kernel ridge regression(KRR),and Elastic net regression(ENet)as primary learners,and the secondary learner adopts the kernel ridge regression method with solid generalization ability.The Amazon public data set experiment shows that compared with Holt-winters,LSTM,and Neuralprophet models,we can see that the optimization range of multiple evaluation indicators is 0.338∼1.913,0.057∼0.940,0.000∼0.017 and 1.038∼8.481 in root means square error(RMSE),mean absolute error(MAE),mean absolute percentage error(MAPE)and variance(VAR),showing its stability and better prediction accuracy.

关键词： Cloud resource prediction variational modal decomposition permutation entropy long and short-term neural network stacking integration

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Scientific objectives and payload configuration of the Chang'E-7 mission

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National Science Review 2024年第2期11卷 285-300页

作者： Chi Wang Yingzhuo Jia Changbin Xue Yangting Lin Jianzhong Liu Xiaohui Fu Lin Xu Yun Huang Yufen Zhao yigang Xu Rui Gao Yong Wei Yuhua tang Dengyun Yu Yongliao Zou China Aerospace Science and Technology Corporation State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences National Space Science Center Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geochemistry Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space SciencesShandong University Institute of Drug Discovery Technology Ningbo University State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Engineering Sun Yat-sen University Lunar Exploration and Space Engineering Center

As the cornerstone mission of the fourth phase of the Chinese Lunar Exploration Program, Chang'E-7(CE-7) was officially approved, and implementation started in 2022, including a main probe and a communication relay satellite. The main probe, consisting of an orbiter, a lander, a rover and a mini-flying probe, is scheduled to be launched in 2026. The lander will land on Shackleton crater's illuminated rim near the lunar south pole, along with the rover and mini-flying probe. The relay satellite(named Queqiao-2) will be launched in February 2024 as an independent mission to support relay communication during scientific exploration undertaken by Chang'E-4, the upcoming Chang'E-6 in 2024 and subsequent lunar missions.The CE-7 mission is mainly aimed at scientific and resource exploration of the lunar south pole. We present CE-7's scientific objectives, the scientific payloads configuration and the main functions for each scientific payload with its key technical specifications.

关键词： Chang’ E-7 scientific objectives scientific payloads

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工程思维能力的培养:内涵、逻辑与路径

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高等工程教育研究 2024年第2期 71-78页

作者：唐浩杨毅刚安利强西北师范大学商学院大唐电信科技产业集团华北电力大学(保定)教务处

《毕业生素质与职业能力要求》(GAPC)全面界定了工科专业毕业生素质与职业能力,GAPC的核心素质和能力是工程思维能力。培养学生的工程思维能力是新形势下工科专业教学改革的重要内容之一。本文梳理了工程实践中工程思维的典型特征,比较... 详细信息

《毕业生素质与职业能力要求》(GAPC)全面界定了工科专业毕业生素质与职业能力,GAPC的核心素质和能力是工程思维能力。培养学生的工程思维能力是新形势下工科专业教学改革的重要内容之一。本文梳理了工程实践中工程思维的典型特征,比较分析了技术、学术思维与工程思维的差别;立足工程教育专业认证视角,解析了通用标准毕业要求与全周期、全流程产品设计/开发方式的对应关系,分析了工程思维能力的核心——非技术工程能力相关毕业要求的内涵、达成评价中常见的问题及误区;最后,从创新培养理念、补齐非技术工程能力短板、开设与设计/开发密切相关的非技术类课程、设置Capstone课程等方面给出了一体化培养工科专业学生工程思维能力的路径。

关键词：工程思维能力 GAPC 工程教育专业认证复杂工程问题非技术工程能力

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低膨胀石英玻璃的制备技术与发展趋势

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材料导报 2024年第S1期38卷 134-136页

作者：王婷沈一春钱宜刚汤明明马祥陈峰南通晶体有限公司江苏南通226010

低膨胀石英玻璃(Low-expansion quartz glass)是指掺有低膨胀氧化物的石英玻璃,其热膨胀系数比一般的石英玻璃低一个或两个数量级,基于这种特质,低膨胀石英玻璃受到了许多人的关注。然而,随着高新技术的快速发展,低膨胀石英玻璃的性能... 详细信息

低膨胀石英玻璃(Low-expansion quartz glass)是指掺有低膨胀氧化物的石英玻璃,其热膨胀系数比一般的石英玻璃低一个或两个数量级,基于这种特质,低膨胀石英玻璃受到了许多人的关注。然而,随着高新技术的快速发展,低膨胀石英玻璃的性能已不能满足新技术领域的需求,直到1968年研制出SiO_(2)-TiO_(2)石英玻璃。相较于其他低膨胀石英玻璃,SiO_(2)-TiO_(2)石英玻璃的热膨胀系数更低,在一定温度范围内甚至可以做到零膨胀或负膨胀,因此掺钛石英玻璃又被称为超低膨胀(Ultra low expansion,ULE)石英玻璃。SiO_(2)-TiO_(2)石英玻璃凭借优秀的性能被广泛应用于半导体、航空航天、电子、光学等领域。SiO_(2)-TiO_(2)石英玻璃通常有以下几种制备方法——溶胶-凝胶法、化学气相沉积法、气相轴向沉积法和等离子体化学气相沉积法等,其中,火焰水解沉积法使用较为广泛,具有成熟的工业应用。

关键词：低膨胀石英玻璃 SiO_(2)-TiO_(2)石英玻璃气相沉积掺杂

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尿道球部闭合性损伤患者内镜下会师术后并发尿道狭窄的危险因素分析

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中华创伤杂志 2024年第4期40卷 367-372页

作者：李金雨汤仕杰于忠英赵力郁毅刚朱显钟林伟鹏中国人民解放军联勤保障部队第九○九医院厦门大学附属东南医院泌尿外科漳州363000 西藏军区总医院泌尿科拉萨850000 中国人民解放军联勤保障部队第九○九医院厦门大学附属东南医院急诊科漳州363000

目的:探讨尿道球部闭合性损伤患者内镜下会师术(ER)后并发尿道狭窄的危险因素。方法:采用回顾性队列研究分析2015年6月至2021年6月中国人民解放军联勤保障部队第九〇九医院收治的126例尿道球部闭合性损伤患者的临床资料,年龄20~69岁[(4... 详细信息

目的:探讨尿道球部闭合性损伤患者内镜下会师术(ER)后并发尿道狭窄的危险因素。方法:采用回顾性队列研究分析2015年6月至2021年6月中国人民解放军联勤保障部队第九〇九医院收治的126例尿道球部闭合性损伤患者的临床资料,年龄20~69岁[(45.1±12.5)岁]。根据ER术后是否并发尿道狭窄,分为狭窄组(43例)和非狭窄组(83例)。比较两组年龄、致伤原因、阴囊血肿、尿道损伤程度、受伤至手术时间、术前导尿次数、术前是否行膀胱造瘘、内镜会师术方式、尿道镜探查时长、术后导尿管是否牵拉、术后中段尿培养结果等情况。采用单因素分析评估上述指标与ER术后并发尿道狭窄的相关性。采用多因素Logistic回归分析确定ER术后并发尿道狭窄的独立危险因素。结果:单因素分析结果显示,尿道损伤程度、术前导尿次数、术前是否行膀胱造瘘、尿道镜探查时长、术后中段尿培养结果阳性与ER术后尿道狭窄有一定的相关性( P<0.05或0.01)。多因素Logistic回归分析结果表明,尿道完全断裂( OR=4.54,95% CI 1.74,11.86, P<0.01)、术前导尿次数≥3次( OR=2.72,95% CI 1.41,5.25, P<0.01)、尿道镜探查时长≥35 min( OR=1.06,95% CI 1.03,1.09, P<0.01)、术后中段尿培养结果阳性( OR=42.99,95% CI 5.91,312.92, P<0.01)与ER术后并发尿道狭窄显著相关。结论:尿道完全断裂、术前导尿次数≥3次、尿道镜探查时长≥35 min、术后中段尿培养结果阳性是尿道球部闭合性损伤患者ER术后并发尿道狭窄的独立危险因素。

关键词：尿道狭窄内窥镜外科手术微创性危险因素

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Numerical simulation of sediment transport in coastal waves and wave-induced currents

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Acta Oceanologica Sinica 2016年第9期35卷 111-116页

作者： tang Jun LYU yigang SHEN Yongming State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116023China Jiaxing City Traffic Engineering Quality and Safety Surveillance liaxing 314001China

Prediction of coastal sediment transport is of particularly importance for analyzing coast erosion accurately and solving the corresponding coast protection engineering problems.The present study provided a numerical scheme for sediment transport in coastal waves and wave-induced currents.In the scheme,the sand transport model was implemented with wave refraction-diffraction model and near-shore current model.Coastal water wave was simulated by using the parabolic mild-slope equation in which wave refraction,diffraction and breaking effects are considered.Wave-induced current was simulated by using the nonlinear shallow water equations in which wave provides radiation stresses for driving current.Then,sediment transport in waves and wave-induced currents was simulated by using the two-dimensional suspended sediment transport equations for suspended sediment and the bed-load transport equation for bed load.The numerical scheme was validated by experiment results from the Large-scale Sediment Transport Facility at the US Army Corps of Engineer Research and Development Center in Vicksburg.The numerical results showed that the present scheme is an effective tool for modeling coastal sediment transport in waves and near-shore currents.

关键词： numerical modeling coastal wave wave-induced current sediment transport suspended sediment bed-load

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Numerical study on water waves and wave-induced longshore currents in Obaky coastal water

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Acta Oceanologica Sinica 2014年第9期33卷 40-46页

作者： tang Jun LYU yigang SHEN Yongming State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

In this paper, the water waves and wave-induced longshore currents in Obak6y coastal water which is located at the Mediterranean coast of Turkey were numerically studied. The numerical model is based on the parabolic mild-slope equation for coastal water waves and the nonlinear shallow water equation for the wave-induced currents. The wave transformation under the effects of shoaling, refraction, diffraction and breaking is considered, and the wave provides radiation stresses for driving currents in the model. The numerical results for the water wave-induced longshore currents were validated by the measured data to demonstrate the efficiency of the numerical model. Then the water waves and longshore currents induced by the waves from main directions were numerically simulated and analyzed based on the numerical results. The numerical results show that the movement of the longshore currents was different while the wave proDaRated to a coastal zone from different directions.

关键词： coast hydrodynamics water wave mild-slope equation wave-induced currents numerical modeling

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Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1144-1159页

作者： Hongyuan tang Ruizhong LIU Xin ZHAO Rui GUO yigang JIA Institute of Structural Engineering Xihua UniversityChengdu 610039China Institute of Design and Research Nanchang UniversityNanchang 330029China

The mechanical properties of CFRP-confined rectangular concrete-filled stainless steel tube(CFSST)stub columns under axial compression were experimentally studied.A total of 28 specimens(7 groups)were fabricated for the axial compression test to study the influences of length-to-width ratio,CFRP constraint coefficient,and the thickness of stainless steel tube on the axial compression behavior.The specimen failure modes,the stress development of stainless steel tube and CFRP wrap,and the load-strain ratio curves in the loading process were obtained.Meanwhile,the relationship between axial and transverse deformations of each specimen was analyzed through the typical relative load-strain ratio curves.A bearing capacity prediction method was proposed based on the twin-shear strength theory,combining the limit equilibrium state of the CFRP-confined CFSST stub column under axial compression.The prediction method was calibrated by the test data in this study and other literature.The results show that the prediction method is of high accuracy.

关键词： CFRP rectangular CFSST stub column bearing capacity limit equilibrium state twin-shear strength theory

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氢质子磁共振波谱对帕金森病与特发性震颤的鉴别诊断价值

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当代医学 2024年第2期30卷 1-7页

作者：汤丹丹张勋符益纲陈松洁孙鼎明周笑朱明明徐杭何国军徐州医科大学盐城临床学院/盐城市第一人民医院神经内科江苏盐城224002 扬州市江都人民医院神经内科江苏扬州225200 徐州医科大学盐城临床学院/盐城市第一人民医院磁共振室江苏盐城224002

目的探讨氢质子磁共振波谱(1H-MRS)对帕金森病(PD)与特发性震颤(ET)的鉴别诊断价值。方法选取2018年9月至2021年1月盐城市第一人民医院门诊及住院收治的15例早期PD患者(PD组)、14例ET患者(ET组)及15名健康志愿者(对照组)作为研究对象,... 详细信息

目的探讨氢质子磁共振波谱(1H-MRS)对帕金森病(PD)与特发性震颤(ET)的鉴别诊断价值。方法选取2018年9月至2021年1月盐城市第一人民医院门诊及住院收治的15例早期PD患者(PD组)、14例ET患者(ET组)及15名健康志愿者(对照组)作为研究对象,所有受试者均行1H-MRS检查,比较所有研究对象苍白球(GP)、丘脑(Th)、黑质(SN)的N-乙酰天冬氨酸(NAA)/胆碱(Cho)、NAA/肌酸(Cr)、Cho/Cr比值。通过Pearson相关性分析研究PD和ET患者1H-MRS比值与性别、年龄、病程、统一帕金森病综合评分量表(UPDRS)-Ⅲ评分之间的关系,绘制ROC曲线评价相关指标的鉴别诊断效能。结果PD组和ET组症状重侧和对侧及对照组左侧和右侧GP、Th、SN的NAA/Cho、NAA/Cr、Cho/Cr比较差异均无统计学意义。PD组GP、Th和SN的NAA/Cho、NAA/Cr比值均低于对照组,ET组GP和Th的NAA/Cho、NAA/Cr比值均低于对照组和PD组,差异有统计学意义(P0,P<0.05)。PD组和对照组中SN的NAA/Cr及PD组和ET组中GP的NAA/Cr鉴别诊断效能最高,AUC分别为0.884和0.888。结论1H-MRS对PD和ET的鉴别有一定的参考价值。

关键词：氢质子磁共振波谱帕金森病特发性震颤统一帕金森病评分量表

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Outbreaks of Acute Respiratory Disease Associated with Human Adenovirus Infection in Closed Camps,China,December 2011–March 2014

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China CDC weekly 2021年第38期3卷 793-798,I0001-I0006页

作者： Juan Du Xiaodong Zhao Fang tang Doudou Huang Guangqian Pei Xiaoai Zhang Baogui Jiang Qingbin Lu Wei Liu yigang Tong Department of Laboratorial Science and Technology School of Public HealthPeking UniversityBeijingChina State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijingChina Center for Diseases Control and Prevention of Chinese People’s Armed Police Forces BeijingChina The Affiliated Drum Tower Hospital of Nanjing University Medical School NanjingJiangsuChina College of Life Science and Technology Beijing University of Chemical TechnologyBeijingChina.

Summary What is already known on this topic?Human adenovirus(HAdV)was frequently associated with acute respiratory disease(ARD)outbreaks in military camps.What is added by this report?HAdV-B7,HAdV-B14,and HAdV-B55 were determined to be responsible for 3,2,and 4 ARD outbreaks in military camps,China,respectively,with a total attack rate of 28.0%during 2011 to 2014.

关键词： acute respiratory Acute

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