Although Video-On-Demand (VOD) has been in existence for years, its cross-platform applicability in cloud service environments is still in increasing need. In this paper, an Adaptive Video-On-Demand (AVOD) framework t...Although Video-On-Demand (VOD) has been in existence for years, its cross-platform applicability in cloud service environments is still in increasing need. In this paper, an Adaptive Video-On-Demand (AVOD) framework that is suitable for private cloud environments is proposed. Private cloud has the key advantage of satisfying the real need of both consumers and providers. Hence, demands such as reasonable benefits for provider and high quality for consumers are essential design considerations in this framework. The difficulty is that these two factors are always high in one end and low in the other, and hard to find a delicate balance. Cloud service could be an opportunity for the multimedia providers to obtain higher benefits and cost less for the consumers but with an even better quality in service. An adaptive framework for such a cloud service environment is proposed to resolve this problem. Some interesting phenomena are observed from the experimental results including CPU utilization, data reading and writing speed, memory usage, port configuration execution time, and bandwidth.展开更多
With the advancement of cloud computing technology,many service providers are combining with cloud service providers to build a highly available streaming video-on-demand cloud platform and provide video services to e...With the advancement of cloud computing technology,many service providers are combining with cloud service providers to build a highly available streaming video-on-demand cloud platform and provide video services to end users.Generally,cloud service providers deploy many edge cloud CDN nodes in different geographic areas and provide video services to end users.However,when an end-user wants to watch certain videos and request video resources from surrounding edge cloud CDN nodes,the edge cloud CDN node will request missing video clips from other cloud nodes.Therefore,this will generate a large amount of additional video transmission costs and reduce the quality of service of the cloud service provider.To reduce or even minimize the video transmission cost of edge cloud CDN nodes while ensuring the quality of service(QoS).We designed a video transmission algorithm called Netdmc to ensure transmission quality.The algorithm can be divided into two parts.The first part is a low-latency video request algorithm based on ensuring service quality,and the second part is a video request algorithm based on minimizing video transmission costs.The simulation results demonstrate that the Netdmc algorithm can effectively reduce the cost of cloud service providers and ensure the quality of video services.展开更多
Video streaming services are trending to be deployed on cloud. Cloud computing offers better stability and lower price than traditional IT facilities. Huge storage capacity is essential for video streaming service. Mo...Video streaming services are trending to be deployed on cloud. Cloud computing offers better stability and lower price than traditional IT facilities. Huge storage capacity is essential for video streaming service. More and more cloud providers appear so there are increasing cloud platforms to choose. A better choice is to use more than one data center, which is called multi-cloud. In this paper a closed-loop approach is proposed for optimizing Quality of Service (QoS) and cost. Modules of monitoring and controlling data centers are required as well as the application feedback such as video streaming services. An algorithm is proposed to help choose cloud providers and data centers in a multi-cloud environment as a video service manager. Performance with different video service workloads are evaluated. Compared with using only one cloud provider, dynamically deploying services in multi-cloud is better in aspects of both cost and QoS. If cloud service costs are different among data centers, the algorithm will help make choices to lower the cost and keep a high QoS.展开更多
为处理分布式光伏发电设备接入电力系统所产生的大量计算任务,满足5G用户设备的低时延需求,文章提出了一种光伏现场基于5G空中接口(5G new radio in unlicensed spectrum,5G NR-U)任务卸载的异构边缘云组网架构,通过将光伏计算任务分布...为处理分布式光伏发电设备接入电力系统所产生的大量计算任务,满足5G用户设备的低时延需求,文章提出了一种光伏现场基于5G空中接口(5G new radio in unlicensed spectrum,5G NR-U)任务卸载的异构边缘云组网架构,通过将光伏计算任务分布式分配给异构的移动边缘计算(mobile edge computing,MEC),建立多用户多任务场景下系统时延和终端能耗最小化为目标的边缘云任务卸载模型,进而提出了一种基于人工免疫算法的多任务卸载策略。实验结果表明,提出的方案有效降低了光伏现场计算任务的综合代价,为5GNR-U时间敏感业务提供确定性通信保障。展开更多
In diverse and self-governed multiple clouds context, the service management and discovery are greatly challenged by the dynamic and evolving features of services. How to manage the features of cloud services and supp...In diverse and self-governed multiple clouds context, the service management and discovery are greatly challenged by the dynamic and evolving features of services. How to manage the features of cloud services and support accurate and efficient service discovery has becomean open problem in the area of cloud computing. This paper proposes a field model of multiple cloud services and corresponding service discovery method to address the issue. Different from existing researches, our approach is inspired by Bohr atom model. We use the abstraction of energy level and jumping mechanism to describe services status and variations, and thereby to support the service demarcation and discovery. The contributions of this paper are threefold. First, we propose the abstraction of service energy level to represent the status of services, and service jumping mechanism to investigate the dynamic and evolving features as the variations and re-demarcation of cloud services according to their energy levels. Second, we present user acceptable service region to describe the services satisfying users' requests and corresponding service discovery method, which can significantly decrease services search scope and improve the speed and precision of service discovery. Third, a series of algorithms are designed to implement the generation of field model, user acceptable service regions, service jumping mechanism, and user-oriented service discovery. We have conducted an extensive experiments on QWS dataset to validate and evaluate our proposed models and algorithms. The results show that field model can well support the representation of dynamic and evolving aspects of services in multiple clouds context and the algorithms can improve the accuracy and efficiency of service discovery.展开更多
部署于云服务传递网络(Cloud Service Delivery Network,CSDN)基础设施的P2P VoD系统,在每个CSDN节点内将同一节目的所有用户构建成P2P覆盖网,但CSDN单节点内大量节目的并发用户稀少.因此,如何在兼顾流量本地化的前提下,解决CSDN架构下P...部署于云服务传递网络(Cloud Service Delivery Network,CSDN)基础设施的P2P VoD系统,在每个CSDN节点内将同一节目的所有用户构建成P2P覆盖网,但CSDN单节点内大量节目的并发用户稀少.因此,如何在兼顾流量本地化的前提下,解决CSDN架构下P2P VoD覆盖网构造中Peer资源稀疏问题是当前面临的一个挑战.为此,提出一种P2P覆盖网的弹性构造方法ECM(Elastic Construction Method).ECM依据资源索引来弹性扩展P2P覆盖网的构造范围,有效解决Peer资源稀疏问题;同时根据CSDN节点间距离来选择扩展路径,实现P2P流量本地化.最后模拟实验结果表明,ECM能有效均衡服务器负载和跨ISP流量.展开更多
文摘Although Video-On-Demand (VOD) has been in existence for years, its cross-platform applicability in cloud service environments is still in increasing need. In this paper, an Adaptive Video-On-Demand (AVOD) framework that is suitable for private cloud environments is proposed. Private cloud has the key advantage of satisfying the real need of both consumers and providers. Hence, demands such as reasonable benefits for provider and high quality for consumers are essential design considerations in this framework. The difficulty is that these two factors are always high in one end and low in the other, and hard to find a delicate balance. Cloud service could be an opportunity for the multimedia providers to obtain higher benefits and cost less for the consumers but with an even better quality in service. An adaptive framework for such a cloud service environment is proposed to resolve this problem. Some interesting phenomena are observed from the experimental results including CPU utilization, data reading and writing speed, memory usage, port configuration execution time, and bandwidth.
基金supported by the national key research and development program of China (No.2020YFF0305300)National Natural Science Foundation (No.61762029,No.61662012,No.U1811264)Guangxi Key Laboratory of Trusted Software (No.kx201726).
文摘With the advancement of cloud computing technology,many service providers are combining with cloud service providers to build a highly available streaming video-on-demand cloud platform and provide video services to end users.Generally,cloud service providers deploy many edge cloud CDN nodes in different geographic areas and provide video services to end users.However,when an end-user wants to watch certain videos and request video resources from surrounding edge cloud CDN nodes,the edge cloud CDN node will request missing video clips from other cloud nodes.Therefore,this will generate a large amount of additional video transmission costs and reduce the quality of service of the cloud service provider.To reduce or even minimize the video transmission cost of edge cloud CDN nodes while ensuring the quality of service(QoS).We designed a video transmission algorithm called Netdmc to ensure transmission quality.The algorithm can be divided into two parts.The first part is a low-latency video request algorithm based on ensuring service quality,and the second part is a video request algorithm based on minimizing video transmission costs.The simulation results demonstrate that the Netdmc algorithm can effectively reduce the cost of cloud service providers and ensure the quality of video services.
基金supported in part by National Key Basic Research and Development (973) Program of China(Nos. 2011CB302805 and 2013CB228206)the National High-Tech Research and Development (863) Program of China (No. 2013BAH19F01)the National Natural Science Foundation of China (No. 61233016)
文摘Video streaming services are trending to be deployed on cloud. Cloud computing offers better stability and lower price than traditional IT facilities. Huge storage capacity is essential for video streaming service. More and more cloud providers appear so there are increasing cloud platforms to choose. A better choice is to use more than one data center, which is called multi-cloud. In this paper a closed-loop approach is proposed for optimizing Quality of Service (QoS) and cost. Modules of monitoring and controlling data centers are required as well as the application feedback such as video streaming services. An algorithm is proposed to help choose cloud providers and data centers in a multi-cloud environment as a video service manager. Performance with different video service workloads are evaluated. Compared with using only one cloud provider, dynamically deploying services in multi-cloud is better in aspects of both cost and QoS. If cloud service costs are different among data centers, the algorithm will help make choices to lower the cost and keep a high QoS.
文摘为处理分布式光伏发电设备接入电力系统所产生的大量计算任务,满足5G用户设备的低时延需求,文章提出了一种光伏现场基于5G空中接口(5G new radio in unlicensed spectrum,5G NR-U)任务卸载的异构边缘云组网架构,通过将光伏计算任务分布式分配给异构的移动边缘计算(mobile edge computing,MEC),建立多用户多任务场景下系统时延和终端能耗最小化为目标的边缘云任务卸载模型,进而提出了一种基于人工免疫算法的多任务卸载策略。实验结果表明,提出的方案有效降低了光伏现场计算任务的综合代价,为5GNR-U时间敏感业务提供确定性通信保障。
基金This research was supported by the National Natural Science Foundation of China (Grant Nos. 61532004 and 61379051).
文摘In diverse and self-governed multiple clouds context, the service management and discovery are greatly challenged by the dynamic and evolving features of services. How to manage the features of cloud services and support accurate and efficient service discovery has becomean open problem in the area of cloud computing. This paper proposes a field model of multiple cloud services and corresponding service discovery method to address the issue. Different from existing researches, our approach is inspired by Bohr atom model. We use the abstraction of energy level and jumping mechanism to describe services status and variations, and thereby to support the service demarcation and discovery. The contributions of this paper are threefold. First, we propose the abstraction of service energy level to represent the status of services, and service jumping mechanism to investigate the dynamic and evolving features as the variations and re-demarcation of cloud services according to their energy levels. Second, we present user acceptable service region to describe the services satisfying users' requests and corresponding service discovery method, which can significantly decrease services search scope and improve the speed and precision of service discovery. Third, a series of algorithms are designed to implement the generation of field model, user acceptable service regions, service jumping mechanism, and user-oriented service discovery. We have conducted an extensive experiments on QWS dataset to validate and evaluate our proposed models and algorithms. The results show that field model can well support the representation of dynamic and evolving aspects of services in multiple clouds context and the algorithms can improve the accuracy and efficiency of service discovery.
文摘部署于云服务传递网络(Cloud Service Delivery Network,CSDN)基础设施的P2P VoD系统,在每个CSDN节点内将同一节目的所有用户构建成P2P覆盖网,但CSDN单节点内大量节目的并发用户稀少.因此,如何在兼顾流量本地化的前提下,解决CSDN架构下P2P VoD覆盖网构造中Peer资源稀疏问题是当前面临的一个挑战.为此,提出一种P2P覆盖网的弹性构造方法ECM(Elastic Construction Method).ECM依据资源索引来弹性扩展P2P覆盖网的构造范围,有效解决Peer资源稀疏问题;同时根据CSDN节点间距离来选择扩展路径,实现P2P流量本地化.最后模拟实验结果表明,ECM能有效均衡服务器负载和跨ISP流量.