提出了一种基于滑动窗口的资源预留SWRR(sliding window based resource reservation)算法,它将预留资源在整个资源池中所占的比例称为窗口。窗口的"滑动"包含2层含义:1)窗口大小动态变化;2)窗口中的资源动态刷新。SWRR已被...提出了一种基于滑动窗口的资源预留SWRR(sliding window based resource reservation)算法,它将预留资源在整个资源池中所占的比例称为窗口。窗口的"滑动"包含2层含义:1)窗口大小动态变化;2)窗口中的资源动态刷新。SWRR已被应用于一个大型的云计算应用平台。实验数据表明,SWRR通过合理资源预留,在兼顾所有任务调度的基础上,可为特定用户提供有效的服务可用性保障。展开更多
Orange Business Services通过全托管的安全网络解决方案与IT服务助力Aurecon(澳昱冠)改造全球通信基础设施,从而提升其协作并提高工作效率和服务可用性。澳昱冠是为政府和私营部门客户提供工程、管理及专业技术服务的全球领先企业。作...Orange Business Services通过全托管的安全网络解决方案与IT服务助力Aurecon(澳昱冠)改造全球通信基础设施,从而提升其协作并提高工作效率和服务可用性。澳昱冠是为政府和私营部门客户提供工程、管理及专业技术服务的全球领先企业。作为五年期合约的一部分。展开更多
Due to its characteristics distribution and virtualization, cloud storage also brings new security problems. User＇s data is stored in the cloud, which separated the ownership from management. How to ensure the securi...Due to its characteristics distribution and virtualization, cloud storage also brings new security problems. User＇s data is stored in the cloud, which separated the ownership from management. How to ensure the security of cloud data, how to increase data availability and how to improve user privacy perception are the key issues of cloud storage research, especially when the cloud service provider is not completely trusted. In this paper, a cloud storage ciphertext retrieval scheme based on AES and homomorphic encryption is presented. This ciphertext retrieval scheme will not only conceal the user retrieval information, but also prevent the cloud from obtaining user access pattern such as read-write mode, and access frequency, thereby ensuring the safety of the ciphertext retrieval and user privacy. The results of simulation analysis show that the performance of this ciphertext retrieval scheme requires less overhead than other schemes on the same security level.展开更多
Service composition is considered to be an effective way for resource sharing and node collaboration in Mobile Ad hoc NETworks (MANETs) environment.In order to improve the reliability and shorten the response time of ...Service composition is considered to be an effective way for resource sharing and node collaboration in Mobile Ad hoc NETworks (MANETs) environment.In order to improve the reliability and shorten the response time of composite services,this paper first analyzes the node environments and network environments that affect the component services' availability,and then proposes an Environment-aware Quantitative Evaluation Model for Service Availability (EQEM-SA).In addition,based on EQEM-SA,a service field concept is proposed as well as the availability attenuation equation,where the availability value is considered as the field strength.Then the service selection approach based on service field model is presented.The effectiveness of the proposed approach is illustrated and compared with related references,and the results of experimental evaluations indicate that our approach significantly reduces the failure rate and shortens the service delay.展开更多
文摘提出了一种基于滑动窗口的资源预留SWRR(sliding window based resource reservation)算法,它将预留资源在整个资源池中所占的比例称为窗口。窗口的"滑动"包含2层含义:1)窗口大小动态变化;2)窗口中的资源动态刷新。SWRR已被应用于一个大型的云计算应用平台。实验数据表明,SWRR通过合理资源预留,在兼顾所有任务调度的基础上,可为特定用户提供有效的服务可用性保障。
基金the National Natural Science Foundation of China under Grant，the Fundamental Research Funds for the Central Universities under Grant No.FRF-TP-14-046A2
文摘Due to its characteristics distribution and virtualization, cloud storage also brings new security problems. User＇s data is stored in the cloud, which separated the ownership from management. How to ensure the security of cloud data, how to increase data availability and how to improve user privacy perception are the key issues of cloud storage research, especially when the cloud service provider is not completely trusted. In this paper, a cloud storage ciphertext retrieval scheme based on AES and homomorphic encryption is presented. This ciphertext retrieval scheme will not only conceal the user retrieval information, but also prevent the cloud from obtaining user access pattern such as read-write mode, and access frequency, thereby ensuring the safety of the ciphertext retrieval and user privacy. The results of simulation analysis show that the performance of this ciphertext retrieval scheme requires less overhead than other schemes on the same security level.
基金supported in part by the National Key Basic Research Program of China(Grant Nos.2009CB320406and2009CB320504)Foundation for Innovative Research Groups of the National Natural Science Foundation of China(Grant No.60821001)National Natural Science Foundation of China(Grant No.61070206)
文摘Service composition is considered to be an effective way for resource sharing and node collaboration in Mobile Ad hoc NETworks (MANETs) environment.In order to improve the reliability and shorten the response time of composite services,this paper first analyzes the node environments and network environments that affect the component services' availability,and then proposes an Environment-aware Quantitative Evaluation Model for Service Availability (EQEM-SA).In addition,based on EQEM-SA,a service field concept is proposed as well as the availability attenuation equation,where the availability value is considered as the field strength.Then the service selection approach based on service field model is presented.The effectiveness of the proposed approach is illustrated and compared with related references,and the results of experimental evaluations indicate that our approach significantly reduces the failure rate and shortens the service delay.
