在网格环境中,多数节点希望能够更多地使用其他节点的资源,而不愿共享本地的资源.每个理性的用户在追求自身利益最大化的同时,严重影响了协作整体的运行效率.在实际应用中,要吸引资源的拥有者加入资源协作,就必须保证其利益和安全.讨论...在网格环境中,多数节点希望能够更多地使用其他节点的资源,而不愿共享本地的资源.每个理性的用户在追求自身利益最大化的同时,严重影响了协作整体的运行效率.在实际应用中,要吸引资源的拥有者加入资源协作,就必须保证其利益和安全.讨论了资源激励机制和分配机制之间的依赖与制约关系,从经济、信任角度提出自适应的信任-激励相容的资源分配机制.在网格环境中,资源供需的变化会引发价格的浮动,基于经济学的一般均衡理论,给出了资源提供者的动态价格调整策略.提供者可根据当前资源的供需和负载状况,制定自适应的信任-激励相容的分配策略ATIM(adaptive trust-incentive compatible resource allocation),遵循多贡献多分配的原则,激励节点共享出有价值的资源,最大化资源的聚合效用.在CROWN(China research and development environment over wider-area network)平台中评估了ATIM机制的效率和性能.展开更多
In response to the strong drive for social and economic development, local governments have implemented urban master plans, providing measures and timeframes to address the continuous demand for land and to alleviate ...In response to the strong drive for social and economic development, local governments have implemented urban master plans, providing measures and timeframes to address the continuous demand for land and to alleviate urban problems. In this paper, a multi-objective model was constructed to discuss the problem, including economic benefits and ecological effectiveness, in terms of land use optimization. A genetic algorithm was then adopted to solve the model, and a performance evaluation and sensitivity analysis were conducted using Pareto optimality. Results showed that a set of tradeoffs could be acquired by the allocation of land use. In addition, the Pareto solutions proved the model to be efficient; for example, a limit of 13,500 ha of urban area conformed to plan recommendations. The reduction in crop land, orchard land, grassland, and unused land provided further efficiencies. These results implied that further potential regional land resources remain and that the urban master plan is able to support sustainable local development in the years to come, as well as verified that it is feasible to use land use allocation multi-objective modeling and genetic algorithms.展开更多
终端直通技术(Device-to-Device,D2D)引入LTE-A蜂窝网络虽然能够提高蜂窝系统性能,但是却带来了很大的干扰。为了降低干扰,提升系统性能,如何进行资源分配成为研究的重点。首先,为了降低资源分配算法的复杂度和干扰强度,提出了D2D通信...终端直通技术(Device-to-Device,D2D)引入LTE-A蜂窝网络虽然能够提高蜂窝系统性能,但是却带来了很大的干扰。为了降低干扰,提升系统性能,如何进行资源分配成为研究的重点。首先,为了降低资源分配算法的复杂度和干扰强度,提出了D2D通信限制区域和D2D用户限制复用蜂窝用户(Cellular User Equipmen,CUE)资源区域的概念。其次,为了保证蜂窝系统服务质量(Quality of Service,Qo S)需求并提升系统性能,提出了一种D2D资源分配算法。最后,使用非线性规划问题中的乘子法来确定D2D用户和CUE的最佳发射功率,以最大化系统吞吐量。仿真结果表明,所提算法与已有方案相比能够显著提升系统的吞吐量和公平性。展开更多
文摘在网格环境中,多数节点希望能够更多地使用其他节点的资源,而不愿共享本地的资源.每个理性的用户在追求自身利益最大化的同时,严重影响了协作整体的运行效率.在实际应用中,要吸引资源的拥有者加入资源协作,就必须保证其利益和安全.讨论了资源激励机制和分配机制之间的依赖与制约关系,从经济、信任角度提出自适应的信任-激励相容的资源分配机制.在网格环境中,资源供需的变化会引发价格的浮动,基于经济学的一般均衡理论,给出了资源提供者的动态价格调整策略.提供者可根据当前资源的供需和负载状况,制定自适应的信任-激励相容的分配策略ATIM(adaptive trust-incentive compatible resource allocation),遵循多贡献多分配的原则,激励节点共享出有价值的资源,最大化资源的聚合效用.在CROWN(China research and development environment over wider-area network)平台中评估了ATIM机制的效率和性能.
基金National Natural Science Foundation of China,No.41130748 No.41171070+2 种基金 China Postdoctoral Science Foundation,No.200902132 No.20080440511 The Humanities and Social Sciences Project of Ministry of Education,PRC,No.10YJCZH031
文摘In response to the strong drive for social and economic development, local governments have implemented urban master plans, providing measures and timeframes to address the continuous demand for land and to alleviate urban problems. In this paper, a multi-objective model was constructed to discuss the problem, including economic benefits and ecological effectiveness, in terms of land use optimization. A genetic algorithm was then adopted to solve the model, and a performance evaluation and sensitivity analysis were conducted using Pareto optimality. Results showed that a set of tradeoffs could be acquired by the allocation of land use. In addition, the Pareto solutions proved the model to be efficient; for example, a limit of 13,500 ha of urban area conformed to plan recommendations. The reduction in crop land, orchard land, grassland, and unused land provided further efficiencies. These results implied that further potential regional land resources remain and that the urban master plan is able to support sustainable local development in the years to come, as well as verified that it is feasible to use land use allocation multi-objective modeling and genetic algorithms.
文摘终端直通技术(Device-to-Device,D2D)引入LTE-A蜂窝网络虽然能够提高蜂窝系统性能,但是却带来了很大的干扰。为了降低干扰,提升系统性能,如何进行资源分配成为研究的重点。首先,为了降低资源分配算法的复杂度和干扰强度,提出了D2D通信限制区域和D2D用户限制复用蜂窝用户(Cellular User Equipmen,CUE)资源区域的概念。其次,为了保证蜂窝系统服务质量(Quality of Service,Qo S)需求并提升系统性能,提出了一种D2D资源分配算法。最后,使用非线性规划问题中的乘子法来确定D2D用户和CUE的最佳发射功率,以最大化系统吞吐量。仿真结果表明,所提算法与已有方案相比能够显著提升系统的吞吐量和公平性。
