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Collaborative Network Security in Multi-Tenant Data Center for Cloud Computing

Tsinghua Science and Technology 2014年第1期19卷 82-94页

作者： Zhen Chen wenyu Dong Hang Li Peng zhang Xinming Chen Junwei Cao research institute of Information Technology and Tsinghua National Lab for Information Science and Technology Tsinghua University Department of Computer Science and Technology Tsinghua University Department of Computer Science and Technology PLA Univ. of Info. & Eng. Department of Electronic and Information Engineering Xi’an Jiaotong University Department of Electrical and Computer Engineering University of Massachusetts

A data center is an infrastructure that supports Internet service. Cloud comput the face of the Internet service infrastructure, enabling even small organizations to quickly ng is rapidly changing build Web and mobile applications for millions of users by taking advantage of the scale and flexibility of shared physical infrastructures provided by cloud computing. In this scenario, multiple tenants save their data and applications in shared data centers, blurring the network boundaries between each tenant in the cloud. In addition, different tenants have different security requirements, while different security policies are necessary for different tenants. Network virtualization is used to meet a diverse set of tenant-specific requirements with the underlying physical network enabling multi-tenant datacenters to automatically address a large and diverse set of tenants requirements. In this paper, we propose the system implementation of vCNSMS, a collaborative network security prototype system used n a multi-tenant data center. We demonstrate vCNSMS with a centralized collaborative scheme and deep packet nspection with an open source UTM system. A security level based protection policy is proposed for simplifying the security rule management for vCNSMS. Different security levels have different packet inspection schemes and are enforced with different security plugins. A smart packet verdict scheme is also integrated into vCNSMS for ntelligence flow processing to protect from possible network attacks inside a data center network

关键词： data center network network security software defined network collaborative network security multi- tenant network virtualization intelligent flow processing cloud computing

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量子计算信息安全威胁与应对策略分析

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信息通信技术与政策 2024年第7期50卷 24-29页

作者：赖俊森赵文玉张海懿中国信息通信研究院技术与标准研究所北京100191

量子计算在理论上已被证明具有远超现有经典计算的公钥密码破解能力。近年来量子计算发展迅速,引发公钥密码破解的信息安全威胁日益迫近,应对量子计算信息安全威胁已成为全球信息安全管理机构和信息通信等行业的关注热点。分析量子计算... 详细信息

量子计算在理论上已被证明具有远超现有经典计算的公钥密码破解能力。近年来量子计算发展迅速,引发公钥密码破解的信息安全威胁日益迫近,应对量子计算信息安全威胁已成为全球信息安全管理机构和信息通信等行业的关注热点。分析量子计算信息安全威胁及影响,探讨抗量子密码和量子密钥分发两种主要应对策略的技术优劣势和应用发展趋势,提出应对量子计算信息安全威胁的发展建议。

关键词：量子计算信息安全抗量子密码量子密钥分发

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Floating periodic pontoons for broad bandgaps of water waves

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Applied Mathematics and Mechanics(English Edition) 2024年第11期45卷 1913-1928页

作者： Huaqing JIN Haicheng zhang Ye LU Daolin XU College of Mechanical and Vehicle Engineering Hunan University Wuxi lntelligent Control research institute Hunan University China ship Scientific research Center

The narrow attenuation bands of traditional marine structures have long been a challenge in mitigating water waves. In this paper, a metastructure(MS) composed of floating periodic pontoons is proposed for broadband water wave attenuation. The interaction of surface gravity waves with the MS is investigated using linear wave *** potential solutions of water waves by the MS with a finite array are developed by using the eigenfunction expansion matching method(EEMM), and the band structure of the MS is calculated by the transfer matrix method(TMM), in which the evanescent modes of waves are considered. The solution is verified against the existing numerical result for a special case. Based on the present solution, the association between Bragg resonance reflection and Bloch bandgaps is examined, the effects of pontoon geometry are analyzed,and the comparison between floating MS and bottom-mounted periodic structures is conducted. A computational fluid dynamics(CFD) model is further developed to assess the structures in practical fluid environments, and the floating MS presents excellent wave attenuation performance. The study presented here may provide a promising solution for protecting the coast and offshore structures.

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Advanced strategies for marine antifouling based on nanomaterial-enhanced functional PDMS coatings

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Nano Materials Science 2024年第4期6卷 375-395页

作者： Xiaohui Shi Hao Wei Wenjun Zhou Paul E.D.Soto Rodriguez Cunguo Lin Lei Wang Zhijia zhang School of Materials Science and Chemical Engineering Harbin Engineering University Qingdao Innovation and Development Center of Harbin Engineering University State Key Laboratory for Marin Corrosion and Protection Luoyang Ship Material Research Institute (LSMRI) Instituto de Estudios Avanzados IUDEA Departamento de Física Universidad de La Laguna C/Astrofísico Francisco Sanchez School of Chemistry and Chemical Engineering Harbin Institute of Technology

Marine biofouling seriously affects human marine exploitation and transportation activities, to which marine antifouling(AF) coatings are considered to be the most cost-effective solution. Since the mid-2.th century, human beings have dedicated their efforts on developing AF coatings with long cycle and high performance, leading to a large number of non-target organisms? distortion, death and marine environmental pollution. Polydimethylsiloxane(PDMS), is considered as one of the representative environment-friendly AF materials thanks to its non-toxic, hydrophobic, low surface energy and AF properties. However, PDMS AF coatings are prone to mechanical damage, weak adhesion strength to substrate, and poor static AF effect, which seriously restrict their use in the ocean. The rapid development of various nanomaterials provides an opportunity to enhance and improve the mechanical properties and antifouling properties of PDMS coating by embedding *** on our research background and the problems faced in our laboratory, this article presents an overview of the current progress in the fields of PDMS composite coatings enhanced by different nanomaterials, with the discussion focused on the advantages and main bottlenecks currently encountered in this field. Finally, we propose an outlook, hoping to provide fundamental guidance for the development of marine AF field.

关键词： Nanomaterials Antifouling PDMS composites Environment-friendly Marine biofouling

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儿童急性淋巴细胞白血病睾丸复发的临床特征及预后因素分析

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中华儿科杂志 2024年第3期62卷 262-267页

作者：王凝高洋洋戚本泉阮敏吕惠张小燕张然然刘天峰陈玉梅邹尧郭晔杨文钰张丽竺晓凡陈晓娟中国医学科学院血液病医院(中国医学科学院血液学研究所)儿童血液病诊疗中心、实验血液学国家重点实验室、国家血液系统疾病临床医学研究中心、细胞生态海河实验室、天津医学健康研究院天津300020

目的探讨急性淋巴细胞白血病(ALL)睾丸复发患儿的临床特征及预后影响因素。方法回顾性分析2.11年11月至2.2.年12.中国医学科学院血液病医院收治的37例ALL睾丸复发患儿的年龄、复发时间、复发部位、复发后治疗等临床资料,按照不同临床... 详细信息

目的探讨急性淋巴细胞白血病(ALL)睾丸复发患儿的临床特征及预后影响因素。方法回顾性分析2.11年11月至2.2.年12.中国医学科学院血液病医院收治的37例ALL睾丸复发患儿的年龄、复发时间、复发部位、复发后治疗等临床资料,按照不同临床资料对患儿进行分组,采用Kaplan-Meier进行单因素分析评估各组患儿总生存率(OS)及无事件生存率(EFS),采用Cox比例风险回归模型进行多因素分析,评估OS及EFS的独立影响因素。结果37例ALL睾丸复发患儿初诊年龄为(5±3)岁,复发时间为(37±15)个月,随访时间为43(2.,56)个月,其中2.例(62.)为孤立睾丸复发。37例ALL睾丸复发患儿5年OS和5年EFS分别为(60±9)%和(50±9)%。单因素分析显示睾丸复发时间>2.个月组2.EFS优于复发时间≤2.个月组[(69±10)%比(11±11)%],孤立睾丸复发组2.EFS优于联合复发组[(66±11)%比(2.±13)%],复发后含嵌合抗原受体T细胞(CAR-T)治疗组2.EFS优于不含CAR-T治疗的患儿[(78±10)%比(15±10)%],差异均有统计学意义(均P2.个月(HR=3.09,95%CI 1.10~8.72.、联合复发(HR=4.2.,95%CI 1.34~13.53)、复发后治疗含CAR-T(HR=0.15,95%CI 0.05~0.51)均是患儿2.EFS的独立影响因素(均P<0.05)。结论儿童ALL睾丸复发时间较晚,通常发生在初诊ALL 3年后,生存率低,ETV6-RUNX1是最常见的分子生物学异常,预后相对较好,早期复发、联合复发者预后差,CAR-T治疗可以显著提高儿童ALL睾丸复发者的生存率。

关键词：白血病复发睾丸儿童

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反散射穆斯堡尔谱仪

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核技术 1984年第4期 13-14页

作者：张家祥洛阳船舶材料研究所

为了用穆斯堡尔效应更方便地真实地研究金属材料的相变、断裂、表面腐蚀等,我们研制了一台反射式穆斯堡尔谱仪,对谱仪上用的反射式正比计数器的窗口材料、计数器结构、封接方式等作了一些工作,摸索出一批经验数据,我们的反射式正比计数... 详细信息

为了用穆斯堡尔效应更方便地真实地研究金属材料的相变、断裂、表面腐蚀等,我们研制了一台反射式穆斯堡尔谱仪,对谱仪上用的反射式正比计数器的窗口材料、计数器结构、封接方式等作了一些工作,摸索出一批经验数据,我们的反射式正比计数器可以改变入射γ射线与样品表面的角度,使用流动的氩+5％甲烷混合气或使用氦+5％甲烷混合气,能量分辨率优于2.％,可以长期连续工作,对于不同形状的样品适应性强,更换样品方便。

关键词：反散射计数器穆斯堡尔谱

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BEHAVIOR OF ELASTIC TOWING CABLES IN SHEAR CURRENTS

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Journal of Hydrodynamics 2005年第5期17卷 590-595页

作者： HOU Guo-xiang LI Hong-bin zhang Sheng-jun YANG Yun-tao XU Shi-hua XIE Wei College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Systems Engineering research institute Beijing 100036 China Wuhan ship Development and Design institute Wuhan 430064 China

The formulation and solution of governing equations that can be used to analyse the three dimensional behaviour of elastic towing cables subjected to arbitrary sheared currents were presented in this paper. The elastic cable geometry was described in terms of two angles, elevation and azimuth, which are related to Cartesian co ordinates by geometry compatibility relations. These relations were combined with the cable equilibrium equations to obtain a system of non-linear differential equations. In the end, results for cable tension, angles, geometry and elongation are presented for example cases.

关键词： buoy system cable shear current tension

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Evaluation of Surface Relative Humidity in China from the CRA-40 and Current Reanalyses

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Advances in Atmospheric Sciences 2021年第11期38卷 1958-1976页

作者： Jingpeng zhang Tianbao ZHAO Zhi LI Chunxiang LI Zhen LI Kairan YING Chunxiang SHI Lipeng JIANG wenyu zhang College of Natural Resources and Environment Northwest A&F UniversityYanglingShaanxi 712100China CAS Key Laboratory of Regional Climate-Environment research for Temperate East Asia(REC-TEA) Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)Beijing 100029China National Meteorological Information Center China Meteorological AdministrationBeijing 100081China School of Geoscience and Technology Zhengzhou UniversityZhengzhouHenan 450001China

Recently,the China Meteorological Administration(CMA)released a new Global Atmospheric Reanalysis(CRA-40)dataset for the period 1979−*** this study,surface relative humidity(RH)from CRA-40 and other current reanalyses(e.g.,CFSR,ERA5,ERA-Interim,JRA-55,and MERRA-2.is comprehensively evaluated against homogenized observations over *** results suggest that most reanalyses overestimate the observations by 15%−30%(absolute difference)over the Tibetan Plateau but underestimate the observations by 5%−10%over most of northern *** CRA-40 performs relatively well in describing the long-term change and variance seen in the observed surface RH over *** of the reanalyses reproduce the observed surface RH climatology and interannual variations well,while few reanalyses can capture the observed long-term RH trends over *** these reanalyses,the CFSR does poorly in describing the interannual changes in the observed RH,especially in Southwest *** empirical orthogonal function(EOF)analysis also suggests that the CRA-40 performs better than other reanalyses to capture the first two leading EOF modes revealed by the *** results of this study are expected to improve understanding of the strengths and weaknesses of the current reanalysis products and thus facilitate their application.

关键词： surface relative humidity CRA-40 reanalysis current reanalysis evaluation

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Optical Properties and Source Analysis of Aerosols over a Desert Area in Dunhuang,Northwest China

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Advances in Atmospheric Sciences 2017年第8期34卷 1017-1026页

作者： Yongjing MA Jinyuan XIN Yining MA Lingbin KONG Kequan zhang wenyu zhang Yuesi WANG Xiuqin WANG Yongfeng ZHU College of Atmospheric Sciences Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu ProvinceLanzhou UniversityLanzhou 730000China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Atmospheric Sciences Chengdu University of Information TechnologyPlateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu 610225China Dunhuang Meteorological Bureau Dunhuang 736200China

Aerosol observational data for 2.12.obtained from Dunhuang Station of CARE-China（Campaign on Atmospheric Aerosol research Network of China） were analyzed to achieve in-depth knowledge of aerosol optical properties over Dunhuang region. The results showed that the annual average aerosol optical depth（AOD） at 500 nm was 0.32.± 0.06, and the ？ngstr？m exponent（α） was 0.73 ± 0.2.. Aerosol optical properties revealed significant seasonal characteristics. Frequent sandstorms in MAM（March–April–May） resulted in the seasonal maximum AOD, 0.41 ± 0.04, and a relatively smaller αvalue, 0.44 ± 0.04. The tourism seasons, JJA（June–July–August） and SON（September–October–November） coincide with serious emissions of small anthropogenic aerosols. While in DJF（December–January–February）, the composition of the atmosphere was a mixture of dust particles and polluted aerosols released by domestic heating; the average AOD and αwere 0.2. ± 0.02.and 0.66 ± 0.17, respectively. Different air masses exhibited different degrees of influence on the aerosol concentration over Dunhuang in different seasons. During MAM, ranges of AOD（0.11–1.18） and α（0.06–0.82. were the largest under the dust influence of northwest-short-distance air mass in the four trajectories. Urban aerosols transported by northwest-short-distance air mass accounted for a very large proportion in JJA and the mixed aerosols observed in SON were mainly conveyed by air masses from the west. In DJF, the similar ranges of AOD and α under the three air mass demonstrated the analogous diffusion effects on regional pollutants over Dunhuang.

关键词： Dunhuang AOD ?ngstr?m exponent dust aerosol anthropogenic aerosols

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Validation of MODIS C6 AOD Products Retrieved by the Dark Target Method in the Beijing–Tianjin–Hebei Urban Agglomeration,China

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Advances in Atmospheric Sciences 2017年第8期34卷 993-1002页

作者： Jie zhang Jinyuan Xin wenyu zhang Shigong WANG Lili WANG Wei XIE Guojie XIAO Hela PAN Lingbin KONG College of Atmospheric Sciences Chengdu University of Information Technology Plateau Atmosphere and Envilvnment Key Laboratory of Sichuan Province Chengdu 610225 China Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The quality of the MODIS C6 3-km and 10-km aerosol optical depth（AOD） products retrieved by the Dark Target（DT）method is discussed using ground-based observations in the Beijing–Tianjin–Hebei region from 1 August 2.07 to 31 July2.08. Good consistency exists between the 3-km and 10-km products and ground-based observations. The retrieval accuracy of the two products both show distinctive seasonality. The percentage falling within the expected error（EE） is largest in the winter, moderate in the spring and autumn, and smallest in the summer. A worse overestimation appears in the spring and summer（2.%–66%）. However, the 3-km and 10-km products over different surfaces still exhibit obvious deviations. The 10-km product performs better in the large cities, while the 3-km product has advantages in the suburbs. In urban areas, the percentage falling within EE of the 3-km AOD product（18%–59%） is lower than that for the 10-km AOD product（31%–69%）. However, in suburban areas, the percentage falling within EE of the 3-km AOD product（61%–84%） is higher than for the 10 km AOD product（54%–83%）.The percentages falling within EE differ considerably when the AOD is greater than1.5（73% and 63% for the 3-km and 10-km products, respectively）. On the whole, the 3-km（10-km） AOD product performs better in suburban（urban） areas.

关键词： aerosol urban agglomeration MODIS AOD

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