To meet the booming development of diversified services and new applications in the future, the fifth-generation mobile conmmnication system （5G） has arisen. Resources are increasingly scarce in the @namic time-vary...To meet the booming development of diversified services and new applications in the future, the fifth-generation mobile conmmnication system （5G） has arisen. Resources are increasingly scarce in the @namic time-varying of 5G networks. Allocating resources effectively and ensuring quality of service （QoS） requirements of multi-seiwices come to be a research focus. In this paper, we utilize effective capacity to build a utility function with multi-QoS metrics, including rate, delay bound and packet loss ratio. Taking advantage of opportunity cost （OC）, we also propose a multi-QoS guaranteed resource allocation algm＇ithm for multi-services to consider the future condition of system. In the algorithm, according to different business characteristics and the theory of OC, we propose different selection conditions for QoS users and best effort （BE） users to choose more reasonable resources. Finally, simulation results show that our proposed algorithm achieves superior system utility and relatively better fairness in multi-service scenarios.展开更多
For now, aluminum industry is facing external and internal challenges: national policy on industrial upgrading and updating,and overcapacity led by disordered investment within the industry. It is very difficult for t...For now, aluminum industry is facing external and internal challenges: national policy on industrial upgrading and updating,and overcapacity led by disordered investment within the industry. It is very difficult for traditional aluminum industry to present highspeed growth again. Updated policies and market will gradually eliminate low-end and high-cost capacity.展开更多
In the post-pandemic era,libraries need to improve the emergency support of electronic resources and establish a relatively perfect electronic resource support system in order to adapt to the construction goal of the ...In the post-pandemic era,libraries need to improve the emergency support of electronic resources and establish a relatively perfect electronic resource support system in order to adapt to the construction goal of the national emergency system as well as realize their own transformation and development.It must be realized through enhancing awareness and planning,strengthening policy support and top-level design,realizing rapid response and intelligent response,improving technical support,promoting resource synergy,integration,and sharing,strengthening community integration,as well as providing intelligent management and services.展开更多
相对科学的分类体系是实现科技文献资源学科特征有效揭示的重要依据。面向国家科技图书文献中心(National Science and Technology Library,NSTL)资源集成与知识服务的总体需求,通过主体及重点学科揭示、多体系融合、多维同位类设置、...相对科学的分类体系是实现科技文献资源学科特征有效揭示的重要依据。面向国家科技图书文献中心(National Science and Technology Library,NSTL)资源集成与知识服务的总体需求,通过主体及重点学科揭示、多体系融合、多维同位类设置、多学科列类、新兴学科类目扩展、综合性类目设置、双重语义编码等方法,编制可基本覆盖NSTL主体资源的NSTL科技文献分类体系,共包含61个基本大类,类目深度为4~5级,类目数达5350个。同时建立与现用核心分类体系的映射关系,支撑资源分类数据规范处理、馆藏目录系统服务等方面的应用。该分类体系可支撑国家重点扶持产业资源保障分析与学科布局评估。展开更多
数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、...数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、服务质量(quality of service,QoS)和用户满意度,因此如何保障应用的性能已成为混部场景下的关键问题.着重从应用和集群特征分析(基础)、干扰检测(前提)、单节点资源分配(微观层面策略)和集群作业调度(宏观层面策略)4个方面阐述多应用混部性能保障的相关背景、挑战和关键技术.在不同的混部场景下,由于应用和集群特征等不同,性能保障工作所面临的挑战和问题复杂度也各异,例如单位资源上混合部署的应用数量会直接影响到搜索资源空间的时间开销,应用的运行方式会影响到共享资源的竞争强度.因此,从问题复杂度角度出发,从应用和集群特征、资源干扰维度和混部应用个数3个维度对相关研究工作面临的挑战进行讨论和分析.探讨了面向高密度混部场景应用性能保障方法的发展方向和挑战,认为全栈式的软硬件协同方法是保障高密度混部下应用性能的趋势,该方法有助于全面地提升应用性能的可靠性和数据中心的资源利用率.展开更多
基金supported by the National Science and Technology Major Project under Grant No.2016ZX03001009-003the Nature and Science Foundation of China under Grants Nos.61471068111 Project of China B16006
文摘To meet the booming development of diversified services and new applications in the future, the fifth-generation mobile conmmnication system （5G） has arisen. Resources are increasingly scarce in the @namic time-varying of 5G networks. Allocating resources effectively and ensuring quality of service （QoS） requirements of multi-seiwices come to be a research focus. In this paper, we utilize effective capacity to build a utility function with multi-QoS metrics, including rate, delay bound and packet loss ratio. Taking advantage of opportunity cost （OC）, we also propose a multi-QoS guaranteed resource allocation algm＇ithm for multi-services to consider the future condition of system. In the algorithm, according to different business characteristics and the theory of OC, we propose different selection conditions for QoS users and best effort （BE） users to choose more reasonable resources. Finally, simulation results show that our proposed algorithm achieves superior system utility and relatively better fairness in multi-service scenarios.
文摘For now, aluminum industry is facing external and internal challenges: national policy on industrial upgrading and updating,and overcapacity led by disordered investment within the industry. It is very difficult for traditional aluminum industry to present highspeed growth again. Updated policies and market will gradually eliminate low-end and high-cost capacity.
文摘In the post-pandemic era,libraries need to improve the emergency support of electronic resources and establish a relatively perfect electronic resource support system in order to adapt to the construction goal of the national emergency system as well as realize their own transformation and development.It must be realized through enhancing awareness and planning,strengthening policy support and top-level design,realizing rapid response and intelligent response,improving technical support,promoting resource synergy,integration,and sharing,strengthening community integration,as well as providing intelligent management and services.
文摘相对科学的分类体系是实现科技文献资源学科特征有效揭示的重要依据。面向国家科技图书文献中心(National Science and Technology Library,NSTL)资源集成与知识服务的总体需求,通过主体及重点学科揭示、多体系融合、多维同位类设置、多学科列类、新兴学科类目扩展、综合性类目设置、双重语义编码等方法,编制可基本覆盖NSTL主体资源的NSTL科技文献分类体系,共包含61个基本大类,类目深度为4~5级,类目数达5350个。同时建立与现用核心分类体系的映射关系,支撑资源分类数据规范处理、馆藏目录系统服务等方面的应用。该分类体系可支撑国家重点扶持产业资源保障分析与学科布局评估。
文摘数据中心的高投入和低资源利用率一直是云服务提供商关注的问题.面对这个难题,直接的解决方案是在同等资源上混合部署更多的应用以提高资源使用效率.然而,由于混部应用对共享资源的竞争导致了应用间的性能干扰,从而影响了应用的性能、服务质量(quality of service,QoS)和用户满意度,因此如何保障应用的性能已成为混部场景下的关键问题.着重从应用和集群特征分析(基础)、干扰检测(前提)、单节点资源分配(微观层面策略)和集群作业调度(宏观层面策略)4个方面阐述多应用混部性能保障的相关背景、挑战和关键技术.在不同的混部场景下,由于应用和集群特征等不同,性能保障工作所面临的挑战和问题复杂度也各异,例如单位资源上混合部署的应用数量会直接影响到搜索资源空间的时间开销,应用的运行方式会影响到共享资源的竞争强度.因此,从问题复杂度角度出发,从应用和集群特征、资源干扰维度和混部应用个数3个维度对相关研究工作面临的挑战进行讨论和分析.探讨了面向高密度混部场景应用性能保障方法的发展方向和挑战,认为全栈式的软硬件协同方法是保障高密度混部下应用性能的趋势,该方法有助于全面地提升应用性能的可靠性和数据中心的资源利用率.
