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Task Scheduling for Multi-Cloud Computing Subject to Security and Reliability Constraints

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IEEE/CAA Journal of Automatica Sinica 2021年第4期8卷 848-865页

作者： Qing-hua zhu huan Tang Jia-Jie huang Yan Hou School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China

The rise of multi-cloud systems has been *** safety-critical missions,it is important to guarantee their security and *** address trust constraints in a heterogeneous multi-cloud environment,this work proposes a novel scheduling method called matching and multi-round allocation(MMA)to optimize the makespan and total cost for all submitted tasks subject to security and reliability *** method is divided into two phases for task *** first phase is to find the best matching candidate resources for the tasks to meet their preferential demands including performance,security,and reliability in a multi-cloud environment;the second one iteratively performs multiple rounds of re-allocating to optimize tasks execution time and cost by minimizing the variance of the estimated completion *** proposed algorithm,the modified cuckoo search(MCS),hybrid chaotic particle search(HCPS),modified artificial bee colony(MABC),max-min,and min-min algorithms are implemented in CloudSim to create *** simulations and experimental results show that our proposed method achieves shorter makespan,lower cost,higher resource utilization,and better trade-off between time and economic *** is more stable and efficient.

关键词： Multi-cloud environment multi-quality of service(QoS) reliability security task scheduling

A deep learning–based U-Net model for ENSO-related precipitation responses to sea surface temperature anomalies over the tropical Pacific

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Atmospheric and Oceanic Science Letters 2023年第4期16卷 57-64页

作者： Yuchao zhu Rong-hua Zhang CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanologyand Center for Ocean Mega-ScienceChinese Academy of SciencesQingdaoChina School of Marine Sciences Nanjing University of Information Science and TechnologyNanjingChina Laoshan Laboratory QingdaoChina University of Chinese Academy of Sciences BeijingChina

SST–降水反馈过程在热带太平洋ENSO演变过程中起着重要作用,能否真实地在数值模式中表征SST–降水年际异常之间的关系及相关反馈过程,对于准确模拟和预测ENSO至关重要.例如,在一些模拟ENSO的混合型耦合模式中,通常采用大气统计模型(如... 详细信息

SST–降水反馈过程在热带太平洋ENSO演变过程中起着重要作用,能否真实地在数值模式中表征SST–降水年际异常之间的关系及相关反馈过程,对于准确模拟和预测ENSO至关重要.例如,在一些模拟ENSO的混合型耦合模式中,通常采用大气统计模型(如经验正交函数;EOF)来表征降水(海气界面淡水通量的一个重要分量)对SST年际异常的线性响应.然而在当前的耦合模式中,真实观测到的降水–SST统计关系还不能被很好地再现出来,从而引起ENSO模拟误差和不确定性.在本研究中,使用基于深度学习的U-Net模型来构建热带太平洋降水异常场对SST年际异常的非线性响应模型.研究发现:U-Net模型的性能优于传统的基于EOF方法的模型.特别是在热带西太平洋海区,U-Net模型估算的降水误差远小于EOF模型的模拟.此外,当SST和降水异常的趋势信息作为输入变量也被同时引入以进一步约束模式训练时,U-Net模型的性能可以进一步提高,如能使热带辐合带区域的误差显著降低.

关键词： U-Net模型 EOF方法 SST-降水年际异常关系 CMIP6模拟

Establishment of a Predictive Model Related to Pathogen Invasion for Infectious Diseases and Its Diagnostic Value in Fever of Unknown Origin

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Current Medical Science 2018年第6期38卷 1025-1031页

作者： zhu-hua WU Ming-you XING Sheng WEI man-zhi ZHAO Wen-xia WANG Lin zhu Ji-ling zhu Cai-feng ZHENG Si-jun WANG Jun-ying QI Jian-xin SONG Department of Infectious Diseases Tongji HospitalTongji Medical CollegeHuazhong University of Science and Technology Wuhan 430030China Department of Epidemiology and Biostatistics School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Oncology the Third Affiliated Hospital of Xinxiang Medical UniversityXinxiang 453000China

The present study aimed to establish a list of parameters indicative of pathogen invasion and develop a predictive model to distinguish the etiologies of fever of unknown origin (FUO) into infectious and non-infectious *** January 2014 to September 2017,431 patients with FUO were prospectively enrolled in the study *** study established a list of 26 variables from the following 4aspects:host factors,epidemiological factors,behavioral factors,and iatrogenic *** predicted variables were included in a multivariate logistic regression analysis to develop a predictive *** predictive model and the corresponding scoring system were developed using data from the confirmed diagnoses and 9 variables were eventually *** factors were incorporated into the predictive *** model discriminated between infectious and non-infectious causes of FUO with an AUC of 0.72,sensitivity of 0.71, and specificity of *** predictive model and corresponding scoring system based on factors concerning pathogen invasion appear to be reliable screening tools to discriminate between infectious and non-infectious causes of FUO.

关键词： fever of unknown origin predictive model etiology empiric therapy

Effect of Blockage Ratio on Heat Transfer and Pressure Drop in Rotating Ribbed Channels at High Rotation Numbers

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Journal of Thermal Science 2021年第3期30卷 902-913页

作者： DENG Hongwu LI hua TAO Zhi QIU Lu zhu Jianqin National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100191China

At high rotation numbers,the rotational effects on heat transfer and flow could be diverse among the channels with different blockage ***,most studies are conducted under low rotation number(less than 0.25)and selected blockage *** paper experimentally investigates the effect of rib blockage ratio(ranges from 0 to 0.3)on pressure loss and heat transfer in a rotating square channel under high rotation number(up to 0.81).The ribs staggered on leading and trailing walls were oriented 90°to the mainstream *** Reynolds number and the wall-to-fluid temperature ratio varied from 20000 to 40000 and 0.08 to 0.2,*** results showed that a larger blockage ratio resulted in a better heat transfer but a higher pressure *** optimum blockage ratio was 0.1 for the best thermal *** rotational effects were weakened in the passage with a higher blockage ratio,where the critical rotation number could not be ***,the heat transfer enhancement induced by rotation was more significant when the temperature ratio ***,the correlations were developed for the pressure drop and the convective heat transfer on the leading and trailing edges.

关键词： thermal performance rib blockage ratio high rotation number

On extra neutral and charged Higgs bosons at the LHC

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Chinese Science Bulletin 2014年第29期59卷 3729-3737页

作者： Xiao-Ping Wang Shou-hua zhu Institute of Theoretical Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Center for High Energy Physics Peking University Collaborative Innovation Center of Quantum Matter

The properties of 125 GeV new particle,which was discovered in 2012 at the Large Hadron Collider(LHC),are found to be consistent with those of the Higgs boson in the standard model(SM).Hereafter the new particle is dubbed as SM-like Higgs *** there is still spacious room for physics beyond the SM(BSM)due to the limited energy and luminosity of the *** more data,experiments will scrutinize whether the new particle is indeed the SM one or *** the same time,one believes that discovery of the SMlike Higgs boson is just the start of the new era of particle *** predominant topic is whether there are other new Higgs bosons as speculated in various BSM *** this short review,we will describe the current status of Higgs physics at the LHC and several BSM models which contain more Higgs *** literatures,there are numerous studies on extended Higgs sector and a comprehensive review is beyond the scope of this ***,we will present two latest studies on Higgs physics:(1)how to detect the charged Higgs boson and measure tan b after including the top polarization information,and(2)how to discover the extra neutral Higgs boson via the pair production of SM-like Higgs boson.

关键词：希格斯玻色子 LHC 中性粒子物理学大型强子对撞机标准模型 BSM 新粒子

Effect of the Inverse Volume Modification in Loop Quantum Cosmology

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Chinese Physics Letters 2011年第3期28卷 21-23页

作者： XIONG hua-Hui zhu Jian-Yang Physics Teaching and Research Group School of Biomedical EngineeringCapital Medical UniversityBeijing 100069 Department of Physics Beijing Normal UniversityBeijing 100875

After incorporating the inverse volume modifications both in the gravitational and matter part in the improved framework of LQC,we find that the inverse volume modification can decrease the bouncing energy scale,and the presence of nonsingular bounce is *** the backward evolution in the expanding branch,in terms of different initial states,the evolution trajectories classify into two *** class with larger initial energy density leads to the occurrence of bounce in the region a>a_(ch)where ash marks the different inverse volume modification *** other class with smaller initial energy density evolves back into the region a

关键词： field inverse backward

A novel method to identify the scaling region for chaotic time series correlation dimension calculation

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Chinese Science Bulletin 2011年第9期56卷 925-932页

作者： JI CuiCui zhu hua JIANG Wei School of Mechanical & Electrical Engineering China University of Mining and Technology Xuzhou 221116 China lnstitute of Medical and Biological Engineering School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK

To obtain more accurate correlation dimension estimations for chaotic time series, a novel scaling region identification method is developed. First, points that obviously do not belong to the scaling region associated with the whole double logarithm correlation integral curve are removed using the K-means algorithm. Second, a point-slope-error algorithm is developed to recognize a possible scaling region. Third, the K-means algorithm is used again to further remove a small interval of interfering points in the possible scaling region to obtain a more precise scaling region. The correlation dimension of four typical chaotic attractors and five curves generated by the Weierstrass-mandelbrot fractal function were calculated using the proposed method. These calculated values were very close to the respective theoretical fractal dimensions. Moreover, the effectiveness of our method in identifying the scaling region was compared with existing methods. Results show that our method can distinguish the scaling region objectively, accurately, automatically and quickly, making estimations of the correlation dimension more precise and affording significant improvements in nonlinear analysis.

关键词：混沌时间序列关联维数识别方法计算值 Weierstrass 标度双对数曲线分形维数

Density changes with substrate negative bias for ta-C films deposited by filter cathode vacuum arc

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中国有色金属学会会刊：英文版 2004年第z1期14卷 238-242页

作者： TAN man-lin zhu Jia-qi HAN Jie-cai MENG Song-he Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China

Specular X-ray reflectivity (XRR) measurements were used to study the density and cross-section information of tetrahedral amorphous carbon (ta-C) films deposited by filter cathode vacuum arc(FCVA) system at different substrate bias. According to the correlation between density and substrate negative bias, it is found that the value of density reaches a maximum at -80 V bias. As the substrate bias increases or decreases, the density tends to lower gradually. Based on the density of diamond and graphite, sp3 bonding ratio of ta-C films was obtained from their corresponding density according to a simple equation between the two. And a similar parabolic variation was observed for ta-C films with the sp3 content changes with substrate negative bias. The mechanical properties such as hardness and elastic modulus were also measured and compared with the corresponding density for ta-C films. From the distribution of data points, a linear proportional correlation between them was found, which shows that the density is a critical parameter to characterize the structure variation for ta-C films.

关键词： ta-C films substrate negative bias X-ray reflectivity density

Application of calcium alumino-titanate to taphole clay

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Journal of Iron and Steel Research International 2022年第7期29卷 1089-1100页

作者： Mao-qi Ju man-fei Cai Yong-he Liang Jian-hua Nie Meng-zhen Guo The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Calcium alumino-titanate(CAT)can be used as a raw material owing to its excellent refractoriness and thermal ***-containing taphole clay(THC)with different particle sizes was prepared and *** results indicated that THC with CAT aggregate has better thermo-mechanical performance than that with a fine CAT powder because of different sintering *** CAT aggregate and SiO_(2)reacted and formed liquid phase covering their surface,enhancing the bonding of the particle–matrix and promoting the internal transformation of the ***,the mullite was formed in aggregate with the interwoven network *** CAT powder has a higher specific surface area,and its surface energy decreases with the particle *** could cause a reaction between CAT and SiO_(2)at relatively low temperature,making it unable to form a core–shell structure similar to that of the aggregate,with the excessive liquid phase affecting the performance of the ***,the liquid phase was formed to close the pores and cover the SiC surface,and this was found to enhance the oxidation resistance.A corrosion test confirmed that the THC refractories with CAT aggregates showed better corrosion resistance than other *** electron microscopy and energy-dispersive spectrometry results indicated that Ti(C,N)transformed by TiO_(2)in CAT was deposited at the interface between the molten slag and the refractory,and it efficiently prevented the penetration and reaction owing to its high melting point and small wetting angle with the slag.

关键词： Taphole clay Calcium alumino-titanate Microstructure Corrosion resistance