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A Multi-Tenant Usage Access Model for Cloud Computing

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Computers, Materials & Continua 2020年第8期64卷 1233-1245页

作者： Zhengtao Liu yun Yang Wen gu Jinyue Xia School of Computer Science and Engineering Sanjiang UniversityNanjing210012China International Business Machines Corporation(IBM) New YorkUSA

Most cloud services are built with multi-tenancy which enables data and configuration segregation upon shared *** offers tremendous advantages for enterprises and service *** is anticipated that this situation will evolve to foster cross-tenant collaboration supported by Authorization as a *** realize access control in a multi-tenant cloud computing environment,this study proposes a multi-tenant cloud computing access control model based on the traditional usage access control model by building trust relations among *** model consists of three sub-models,which achieve trust relationships between tenants with different granularities and satisfy the requirements of different application *** an established trust relation in MT-UCON(Multi-tenant Usage Access Control),the trustee can precisely authorize cross-tenant accesses to the trustor’s resources consistent with constraints over the trust relation and other components designated by the *** addition,the security of the model is analyzed by an information flow *** model adapts to the characteristics of a dynamic and open multi-tenant cloud computing environment and achieves fine-grained access control within and between tenants.

关键词： Multi-tenant usage access control model cloud computing

Isolation and differentiation of neural stem/progenitor cells from fetal rat dorsal root ganglia

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Science China(Life Sciences) 2010年第9期53卷 1057-1064页

作者： gu yun HU Nan LIU Jie DING Fei gu XiaoSong Medical School of Soochow University Suzhou 215123China Jiangsu Key Laboratory of Neuroregeneration Nantong UniversityNantong 226001China

To find a promising alternative to neurons or schwann cells (SCs) for peripheral nerve repair applications,this study sought to isolate stem cells from fetal rat dorsal root ganglion (DRG) *** expression analysis confirmed neural stem cell characteristics of DRG-derived neurospheres in terms of expressing neural stem cell-specific genes and a set of well-defined genes related to stem cell niches and glial fate *** the influence of neurotrophic factors,bFGF and NGF,the neurospheres gave rise to neurofilament-expressing neurons and S100-expressing Schwann cell-like cells by different *** study suggests that a subpopulation of stem cells that reside in DRGs is the progenitor of neurons and glia,which could directly induce the differentiation toward neurons,or SCs.

关键词： dorsal root ganglia cell culture stem/progenitor cells immunocytochemistry induced differentiation

Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers:Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties

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Chinese Journal of Polymer Science 2024年第8期42卷 1093-1102页

作者： Qing-yun Lu Hong-Wei gu Jia-Hui Li Qian-Qian Fan Bei-tao Liu Yan Kou Xi-Gao Jian Zhi-Huan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartment of Polymer Science&EngineeringDalian University of TechnologyDalian 116024China Thermochemistry Laboratory Liaoning Province Key Laboratory of Thermochemistry for Energy and MaterialsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Toughening the petroleum-based epoxy resin blends with bio-based modifiers without compromising their modulus,mechanical strength,and other properties is still a big challenge in view of the *** this study,a bio-based liquid crystal epoxy resin(THMT-E P)with an s-triazine ring structure was utilized to modify a petroleum-based bisphenol A epoxy resin(E51)with 4,4'-diaminodiphenylsulfone(DDS)as a curing agent,and the blended systems were evaluated for their thermal stability,mechanical properties,and flame *** results showed that the impact strength of the blended system initially increased and then decreased with the increase in THMT-EP content,and it reached the a maximum value of 26.5 kJ/m^(2)when the THMT-EP content was 5%,which was 31.2%higher than that of E51/***,the flexural strength,modulus,and glass transition tem perature of the blended system were all simultaneously improved with the addition of *** the same time,the addition of THMT-EP enhanced the flame retardancy of the system by increasing the char yield at 700℃and decreasing the peak heat release rate and total heat release *** work paves the way for a more sustainable improvement in the comprehensive performance of epoxy resin.

关键词： Epoxy resin Toughening Bio-based Thermotropic liquid crystal

Unsteady Flow and Structural Behaviors of Centrifugal Pump under Cavitation Conditions

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Chinese Journal of Mechanical Engineering 2019年第1期32卷 127-141页

作者： Denghao Wu yun Ren Jiegang Mou yunqing gu Lanfang Jiang College of Mechanical Engineering Zhejiang University of Technology Zhijiang College Zhejiang University of Technology

Cavitation has a significant e ect on the flow fields and structural behaviors of a centrifugal pump. In this study, the unsteady flow and structural behaviors of a centrifugal pump are investigated numerically under di erent cavitation conditions. A strong two-way coupling fluid-structure interaction simulation is applied to obtain interior views of the e ects of cavitating bubbles on the flow and structural dynamics of a pump. The renormalization-group k-ε turbulence model and the Zwart–Gerbe–Belamri cavitation model are solved for the fluid side, while a transient structural dynamic analysis is employed for the structure side. The di erent cavitation states are mapped in the head-net positive suction head(H-NPSH) curves and flow field features inside the impeller are fully revealed. Results indicate that cavitating bubbles grow and expand rapidly with decreasing NPSH. In addition, the pressure fluctuations, both in the impeller and volute, are quantitatively analyzed and associated with the cavitation states. It is shown that influence of the cavitation on the flow field is critical, specifically in the super-cavitation state. The e ect of cavitation on the unsteady radial force and blade loads is also discussed. The results indicate that the averaged radial force increased from 8.5 N to 54.4 N in the transition progress from an onset cavitation state to a super-cavitation state. Furthermore, the structural behaviors, including blade deformation, stress, and natural frequencies, corresponding to the cavitation states are discussed. A large volume of cavitating bubbles weakens the fluid forces on the blade and decreases the natural frequencies of the rotor system. This study could enhance the understanding of the e ects of cavitation on pump flow and structural behaviors.

关键词： Centrifugal pump Cavitation Unsteady flow Structural behaviors Fluid-structure interaction

BAYESIAN DEMONSTRATION TEST METHOD WITH MIXED BETA DISTRIBUTION

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Chinese Journal of Mechanical Engineering 2008年第3期21卷 116-119页

作者： MING Zhimao tao Junyong CHEN Xun ZHANG yun＇an College of Mechatronics Engineering and Automation N~onal University of Defense Technology Changsha 410073 China Reliability Testing Laboratory National University of Defense Technology Changsha 410073 China Department of Mechanical Engineering University of Maryland MD 20742 USA Colloge of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China

A complex mechatronics system Bayesian plan of demonstration test is studied based on the mixed beta distribution. During product design and improvement various information is appropriately considered by introducing inheritance factor, moreover, the inheritance factor is thought as a random variable, and the Bayesian decision of the qualification test plan is obtained, and the correctness of a Bayesian model presented is verified. The results show that the quantity of the test is too conservative according to classical methods under small binomial samples. Although traditional Bayesian analysis can consider test information of related or similar products, it ignores differences between such products. The method has solved the above problem, furthermore, considering the requirement in many practical projects, the differences among this method, the classical method and Bayesian with beta distribution are compared according to the plan of reliability acceptance test.

关键词： Reliability qualification test Inheritance factor Bayesian analysis Binomial distribution Maximum posterior risk

Ultra-low noise measurements of nanopore-based single molecular detection

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Science Bulletin 2017年第18期62卷 1245-1250页

作者： Zhen gu Huifeng Wang Yi-Lun Ying Yi-tao Long Key Laboratory for Advanced Materials & School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China School of Information Science and Engineering East China University of Science and Technology Shanghai 200237 China

Nanopore is an ultra-sensitive electrochemical technique for single molecular detection in confined space. To suppress the noise in detection of the weak current of nanopore, we investigated the influence of membrane capacitance and applied voltage on the noise of the current signal by model analysis, simulation and experiment. The obtained results demonstrated that membrane capacitance affects the noise by amplifying the noise of the applied voltage. Therefore, suppression of applied voltage noise is an efficient approach for reducing the noise in nanopore detection. Here, we developed an ultra-low noise instrument system for detecting the single molecule signal in nanopores. As demonstrated by nanopore experiments, the p-p noise of the developed system during the recording is reduced to 3.2B pA using the filter of 5 kHz. Therefore, the developed system could be applied in highly sensitive nanopore detection.

关键词： Nanopore Membrane capacitance Current amplifier Signal amplifier and recording High current resolution

A Stackelberg game approach for demand response management of multi-microgrids with overlapping sales areas

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Science China(Information Sciences) 2019年第11期62卷 121-133页

作者： Jun LI guangqing MA tao LI Wushun CHEN Yu gu School of Mechatronic Engineering and Automation Shanghai University CASCO Signal Ltd. Key Laboratory of Pure Mathematics and Mathematical Practice School of Mathematical SciencesEast China Normal University

Microgrids are increasingly participating directly in the electricity market as sellers in order to fulfill the power demand in specific regions. In this study, we consider a demand response management model for multi-microgrids and multi-users, with overlapping sales areas. We construct a Stackelberg game model of microgrids and users, and then analyze the equilibrium strategies systematically. As such, we prove that there is a unique Stackelberg equilibrium solution for the game. In equilibrium, the electricity price strategies of the microgrids and the demand strategies of the users achieve a balance. Furthermore, we propose a numerical algorithm, supported by a simulation, to compute the equilibrium solution and give the proof of convergence.

关键词： electricity market microgrid demand response management overlapping sales areas game theory Stackelberg equilibrium

ZnCl_2-assisted Synthesis of ZnSe Polycrystal

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Journal of Materials Science & Technology 2012年第4期28卷 373-378页

作者： Changyou Liu tao Wang Gangqiang Zha Zhi gu Wanqi Jie State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

A chemical-assisted element direct-reaction method is developed to synthesize ZnSe compound semiconductor material at a relatively low temperature （-1000 ℃）. ZnSe polycrystal was obtained in the closed-tube systems with Zn-Se, Zn-Se-Zn（NHa）2CI2, ZnoSe-NH4CI and Zn-Se-ZnCI2. The as-synthesized samples were tested by X-ray diffraction （XRD）, thermogravimetric analysis （TGA） and analyzed by thermodynamic numerical method. The results demonstrate that the synthesis efficiency is higher than 99.96% for Zn-Se-ZnCl2 system at around 1000 ℃ for 3 weeks. It also exhibits that not only temperature, but also low apparent ratio of volume and surface area of the source materials and higher ZnCl2 content are required to achieve high synthesis efficiency. A SeCI transporting reaction synthesis process is proposed based on the thermodynamic analysis.

关键词： Crystallites Growth from vapor Zinc compounds Semiconducting II-VI materials

PREPARATION　AND　CRYSTALLINE　MICROSTRUCTURE　OF　RAPIDLY　SOLIDIFIED　NEW　AMORPHOUS　Al－Fe－V－Si－Mm　ALLOY

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中国有色金属学会会刊：英文版 1995年第4期5卷 133-138页

作者： Wang, Jianqiang gu, tao Zeng, Meiguang Chen, Xiufang Zhang, Baojing Northeastern Univ Shenyang China

ＰＲＥＰＡＲＡＴＩＯＮＡＮＤＣＲＹＳＴＡＬＬＩＮＥＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＦＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＮＥＷＡＭＯＲＰＨＯＵＳＡｌ－Ｆｅ－Ｖ－Ｓｉ－ＭｍＡＬＬＯＹＷａｎｇＪｉａｎｑｉａｎｇ；ＧｕＴａｏ；... 详细信息

ＰＲＥＰＡＲＡＴＩＯＮＡＮＤＣＲＹＳＴＡＬＬＩＮＥＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＦＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＮＥＷＡＭＯＲＰＨＯＵＳＡｌ－Ｆｅ－Ｖ－Ｓｉ－ＭｍＡＬＬＯＹＷａｎｇＪｉａｎｑｉａｎｇ；ＧｕＴａｏ；ＺｅｎｇＭｅｉｇｕａｎｇ；Ｃｈｅｎ...

关键词： rapid solidification Al-Fe-V-Si-Mm alloy amorphous phase annealed crystallization