Private clouds and public clouds are turning mutually into the open integrated cloud computing environment,which can aggregate and utilize WAN and LAN networks computing,storage,information and other hardware and soft...Private clouds and public clouds are turning mutually into the open integrated cloud computing environment,which can aggregate and utilize WAN and LAN networks computing,storage,information and other hardware and software resources sufficiently,but also bring a series of security,reliability and credibility problems.To solve these problems,a novel secure-agent-based trustworthy virtual private cloud model named SATVPC was proposed for the integrated and open cloud computing environment.Through the introduction of secure-agent technology,SATVPC provides an independent,safe and trustworthy computing virtual private platform for multi-tenant systems.In order to meet the needs of the credibility of SATVPC and mandate the trust relationship between each task execution agent and task executor node suitable for their security policies,a new dynamic composite credibility evaluation mechanism was presented,including the credit index computing algorithm and the credibility differentiation strategy.The experimental system shows that SATVPC and the credibility evaluation mechanism can ensure the security of open computing environments with feasibility.Experimental results and performance analysis also show that the credit indexes computing algorithm can evaluate the credibilities of task execution agents and task executor nodes quantitatively,correctly and operationally.展开更多
This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the cloud.To secure the factors,a multiway dynamic trust chain transfer model was proposed...This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the cloud.To secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine monitor.Through dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown.展开更多
With the increasing maturity of various computational electromagnetics algorithms,the field has evolved from traditional standalone electromagnetic simulations to a stage in which trustworthy electromagnetic computati...With the increasing maturity of various computational electromagnetics algorithms,the field has evolved from traditional standalone electromagnetic simulations to a stage in which trustworthy electromagnetic computation methods serve as the core,aimed at meeting the advanced demands of computer-aided engineering.Trustworthy electromagnetic computation consists of three key aspects:trustworthy model,trustworthy mesh,and trustworthy algorithm.This paper focuses on the aspect of trustworthy mesh,aiming to establish a systematic framework and methodology for achieving trustworthy computation under the assumption that the target geometry and associated parameters are determined.The framework starts with high-fidelity geometric meshing.An effective strategy is nonconformal domain decomposition,which facilitates accurate modeling of complex geometries and diverse materials.Subsequently,efficient preconditioning methods are utilized to ensure stable convergence when solving the resulting multiscale systems associated with high-fidelity meshes.After obtaining the numerical solution,verification procedures are applied to evaluate whether the desired accuracy has been achieved.If the solution fails to meet the specified precision,adaptive mesh refinement techniques are used to automatically redistribute mesh density.The objective is to attain greater accuracy with a minimal increase in degrees of freedom,thereby enhancing computational efficiency.The adaptive refinement process proceeds iteratively until the computed solution satisfies the established accuracy criteria.Within this framework,we propose a novel,fast,physics-based self-reference method,which leverages power conservation laws to assess the accuracy of the solution.展开更多
基金Projects(61202004,61272084)supported by the National Natural Science Foundation of ChinaProjects(2011M500095,2012T50514)supported by the China Postdoctoral Science Foundation+2 种基金Projects(BK2011754,BK2009426)supported by the Natural Science Foundation of Jiangsu Province,ChinaProject(12KJB520007)supported by the Natural Science Fund of Higher Education of Jiangsu Province,ChinaProject(yx002001)supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘Private clouds and public clouds are turning mutually into the open integrated cloud computing environment,which can aggregate and utilize WAN and LAN networks computing,storage,information and other hardware and software resources sufficiently,but also bring a series of security,reliability and credibility problems.To solve these problems,a novel secure-agent-based trustworthy virtual private cloud model named SATVPC was proposed for the integrated and open cloud computing environment.Through the introduction of secure-agent technology,SATVPC provides an independent,safe and trustworthy computing virtual private platform for multi-tenant systems.In order to meet the needs of the credibility of SATVPC and mandate the trust relationship between each task execution agent and task executor node suitable for their security policies,a new dynamic composite credibility evaluation mechanism was presented,including the credit index computing algorithm and the credibility differentiation strategy.The experimental system shows that SATVPC and the credibility evaluation mechanism can ensure the security of open computing environments with feasibility.Experimental results and performance analysis also show that the credit indexes computing algorithm can evaluate the credibilities of task execution agents and task executor nodes quantitatively,correctly and operationally.
基金supported by The National Natural Science Foundation for Young Scientists of China under Grant No.61303263the Jiangsu Provincial Research Foundation for Basic Research(Natural Science Foundation)under Grant No.BK20150201+4 种基金the Scientific Research Key Project of Beijing Municipal Commission of Education under Grant No.KZ201210015015Project Supported by the National Natural Science Foundation of China(Grant No.61370140)the Scientific Research Common Program of the Beijing Municipal Commission of Education(Grant No.KMKM201410015006)The National Science Foundation of China under Grant Nos.61232016 and U1405254and the PAPD fund
文摘This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the cloud.To secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine monitor.Through dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown.
基金supported by the National Natural Science Foundation of China(Grant Nos.62231007 and 62031010).
文摘With the increasing maturity of various computational electromagnetics algorithms,the field has evolved from traditional standalone electromagnetic simulations to a stage in which trustworthy electromagnetic computation methods serve as the core,aimed at meeting the advanced demands of computer-aided engineering.Trustworthy electromagnetic computation consists of three key aspects:trustworthy model,trustworthy mesh,and trustworthy algorithm.This paper focuses on the aspect of trustworthy mesh,aiming to establish a systematic framework and methodology for achieving trustworthy computation under the assumption that the target geometry and associated parameters are determined.The framework starts with high-fidelity geometric meshing.An effective strategy is nonconformal domain decomposition,which facilitates accurate modeling of complex geometries and diverse materials.Subsequently,efficient preconditioning methods are utilized to ensure stable convergence when solving the resulting multiscale systems associated with high-fidelity meshes.After obtaining the numerical solution,verification procedures are applied to evaluate whether the desired accuracy has been achieved.If the solution fails to meet the specified precision,adaptive mesh refinement techniques are used to automatically redistribute mesh density.The objective is to attain greater accuracy with a minimal increase in degrees of freedom,thereby enhancing computational efficiency.The adaptive refinement process proceeds iteratively until the computed solution satisfies the established accuracy criteria.Within this framework,we propose a novel,fast,physics-based self-reference method,which leverages power conservation laws to assess the accuracy of the solution.
