Dynamic data replication is a technique used in data grid environments that helps to reduce access latency and network bandwidth utilization. Replication also increases data availability thereby enhancing system relia...Dynamic data replication is a technique used in data grid environments that helps to reduce access latency and network bandwidth utilization. Replication also increases data availability thereby enhancing system reliability. In this paper we discuss the issues with single-location strategies in large-scale data integration applications, and examine potential multiple-location schemes. Dynamic multiple-location replication is NP-complete in nature. We therefore transform the multiple-location problem into several classical mathematical problems with different parameter settings, to which efficient approximation algorithms apply experimental results indicate that unlike single-location strategies our multiple-location schemes are efficient with respect to access latency and bandwidth consumption, especially when the requesters of a data set are distributed over a large scale of locations.展开更多
为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算...为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算法处理VPP内部调度资源分配问题。通过分析不同种类DER的适应度系数与可调容量，提出多方共赢的VPP内部DER的均衡调度策略：适应度系数越小（即调用成本越低1、可调容量越大的DER参与调度的机会越多，反之越少。算例分析证明了所提模型和算法的合理性和有效性。与传统基于市场机制的VPP调度方法相比，模仿者动态算法在解决VPP内部DER调度问题方面能有效控制调度成本，同时具有简便、易拓展的特点。展开更多
基金the National Natural Science Foundation of China (70671011)the National High-Technology Research and Development Program of China (863 Program) (2007AA04Z1B1)the Social Science Youth Foundation of Chongqing University ( CDSK2007-37)
文摘Dynamic data replication is a technique used in data grid environments that helps to reduce access latency and network bandwidth utilization. Replication also increases data availability thereby enhancing system reliability. In this paper we discuss the issues with single-location strategies in large-scale data integration applications, and examine potential multiple-location schemes. Dynamic multiple-location replication is NP-complete in nature. We therefore transform the multiple-location problem into several classical mathematical problems with different parameter settings, to which efficient approximation algorithms apply experimental results indicate that unlike single-location strategies our multiple-location schemes are efficient with respect to access latency and bandwidth consumption, especially when the requesters of a data set are distributed over a large scale of locations.
文摘为优化整个虚拟发电厂（virtual power plant，VPP）内部分布式发电资源（distributed energy resources，DER）的调度成本。基于VPP的多代理结构形式建立了VPP内部DER的均衡调度模型，以实时满足系统负荷需求为条件，利用模仿者动态算法处理VPP内部调度资源分配问题。通过分析不同种类DER的适应度系数与可调容量，提出多方共赢的VPP内部DER的均衡调度策略：适应度系数越小（即调用成本越低1、可调容量越大的DER参与调度的机会越多，反之越少。算例分析证明了所提模型和算法的合理性和有效性。与传统基于市场机制的VPP调度方法相比，模仿者动态算法在解决VPP内部DER调度问题方面能有效控制调度成本，同时具有简便、易拓展的特点。
