文章设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的水情信息无线传输系统,构建了感知层、网络传输层、边缘处理层和平台服务层的多层架构。文章通过低功耗多参数采集节点、自适应通信机制与边缘计算融合,实现了复杂环境下...文章设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的水情信息无线传输系统,构建了感知层、网络传输层、边缘处理层和平台服务层的多层架构。文章通过低功耗多参数采集节点、自适应通信机制与边缘计算融合,实现了复杂环境下水情数据的高效获取与智能处理。系统引入轻量级抗冲突协议与边缘异常识别模型,提升了传输可靠性与响应能力。结合网络模拟器3(Network Simulator 3,NS-3)仿真平台对不同地形与节点密度下系统性能进行量化评估,结果表明该系统在典型水情场景中具备良好的通信稳定性、可扩展性与抗干扰能力,验证了其在实际部署中的可行性和实用价值。展开更多
针对命名数据网络(named data networking,NDN)中缓存冗余高、资源利用率低的问题,提出基于数据冗余包的协同缓存放置策略(cooperative cache placement strategy based on da-ta redundancy packet,CCPS-DRP)。该策略先对网络进行社区...针对命名数据网络(named data networking,NDN)中缓存冗余高、资源利用率低的问题,提出基于数据冗余包的协同缓存放置策略(cooperative cache placement strategy based on da-ta redundancy packet,CCPS-DRP)。该策略先对网络进行社区划分,再利用复杂网络中节点介数确定关键路由节点,将数据冗余包中的相同数据副本存放于其中,并动态管理冗余数据副本,实现关键节点集中管理与动态冗余清理的协同机制,以减少相同数据内容的重复缓存,使路由节点中的缓存容量得到充分利用,降低网络负载。实验结果表明,无论在均匀分布或高度偏斜分布的场景下,还是在严格资源限制或有较高资源的场景下,CCPS-DRP在缓存命中率和平均请求时延方面的性能均明显优于常见的随处缓存策略、概率缓存策略等,其通过协同缓存与冗余控制显著提升了网络性能。展开更多
This paper presents the hypermedia data model based on the infinity RS image information system we have developed.The hypermedia data model consists of different semantic units called nodes,and the associations betwee...This paper presents the hypermedia data model based on the infinity RS image information system we have developed.The hypermedia data model consists of different semantic units called nodes,and the associations between nodes are called links.This paper proposes three kinds of nodes (interior node,physical node and complex node) and two kinds of links (plane network structure link,hyper_cube network structure links).The hypermedia information system,based on the model and the basic data layer (the infiniy RS image),represents a digital globe.An approach to the “Getting Lost in the Hyper_space” problem is presented.The approach using the hypermedia data model is an efficient way of handling a large number of RS images in various geographical information systems.展开更多
文摘文章设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的水情信息无线传输系统,构建了感知层、网络传输层、边缘处理层和平台服务层的多层架构。文章通过低功耗多参数采集节点、自适应通信机制与边缘计算融合,实现了复杂环境下水情数据的高效获取与智能处理。系统引入轻量级抗冲突协议与边缘异常识别模型,提升了传输可靠性与响应能力。结合网络模拟器3(Network Simulator 3,NS-3)仿真平台对不同地形与节点密度下系统性能进行量化评估,结果表明该系统在典型水情场景中具备良好的通信稳定性、可扩展性与抗干扰能力,验证了其在实际部署中的可行性和实用价值。
文摘针对命名数据网络(named data networking,NDN)中缓存冗余高、资源利用率低的问题,提出基于数据冗余包的协同缓存放置策略(cooperative cache placement strategy based on da-ta redundancy packet,CCPS-DRP)。该策略先对网络进行社区划分,再利用复杂网络中节点介数确定关键路由节点,将数据冗余包中的相同数据副本存放于其中,并动态管理冗余数据副本,实现关键节点集中管理与动态冗余清理的协同机制,以减少相同数据内容的重复缓存,使路由节点中的缓存容量得到充分利用,降低网络负载。实验结果表明,无论在均匀分布或高度偏斜分布的场景下,还是在严格资源限制或有较高资源的场景下,CCPS-DRP在缓存命中率和平均请求时延方面的性能均明显优于常见的随处缓存策略、概率缓存策略等,其通过协同缓存与冗余控制显著提升了网络性能。
文摘This paper presents the hypermedia data model based on the infinity RS image information system we have developed.The hypermedia data model consists of different semantic units called nodes,and the associations between nodes are called links.This paper proposes three kinds of nodes (interior node,physical node and complex node) and two kinds of links (plane network structure link,hyper_cube network structure links).The hypermedia information system,based on the model and the basic data layer (the infiniy RS image),represents a digital globe.An approach to the “Getting Lost in the Hyper_space” problem is presented.The approach using the hypermedia data model is an efficient way of handling a large number of RS images in various geographical information systems.
