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Search Results: 1 - 10 of 54150 matches for " 韩冰青? "
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Multi-rate Multi-cast Resource Allocation Algorithm for Ad hoc Networks
支持多速率多播的Ad hoc网络资源分配算法

,陈 伟,张 宏
计算机科学 , 2012,
Abstract: Multicast sessions arc expected to be an efficient communication scheme especially for multimedia applications in mobile Ad hoc networks. A new resource allocation algorithm was proposed for wireless Ad hoc networks with multi-rate multi-cast capability. It uses a price-based approach to solve the multi-rate multi-cast problem. And it can adaptively allocate network traffic such that the aggregate utility for all sessions is maximized. Simulation results show that the proposed algorithm not only has good convergence, but also its multi-rate multi-cast capability allows users with different channel to achieve maximum performance, thereby increasing the network throughput.
支持多速率多播的adhoc网络资源分配算法
,陈 伟,张 宏?
计算机科学 , 2012,
Abstract: 多播流是无线adhoc网络中的一种常见和有效的通信形式,尤其是对多媒体业务而言。提出了一种支持多速率多播传输的adhoc网络资源分配算法,它通过引入基于价格的流量分配方案来解决多速率多播传输问题,从而能够自适应地分配网络流量,并且最大化网络流的总效用。仿真结果表明,该算法不仅具有良好的收敛性,而且它的多速率多播传输特性使得不同信道条件的用户能获得最佳的网络性能,从而提高了网络吞吐量。
一种新的qos感知的adhoc网络多径dymo路由协议
,陈伟,张宏?
计算机科学 , 2010,
Abstract: dymo是adhoc网络中一种动态的按需路由协议,本质上属于单径路由协议,而多径路由能更好地支持qos。首先分析了dymo协议的优点及存在的问题,在此基础上将dymo和服务质量qos及多径路由结合起来,提出一种新的qos感知的多径dymo路由协议qa-dymo,利用多条链路不相交路径来发送数据,并提出一种qos感知的路由算法。该协议能够适应网络的动态变化和较好地支持qos。仿真结果表明,该协议要优于其他相关的协议。
无线adhoc网络中qos感知的跨层资源分配算法
,张宏?,刘凤玉?,陈伟?
软件学报 , 2010,
Abstract: 在分析无线adhoc网络资源分配模型的基础上,提出一种qos感知的跨层资源分配算法cl-qara(crosslayerqosawareresourceallocation).其主要思想是,引入价格作为资源分配的度量指标,以qos带宽需求为参数,将网络层的动态资源分配信息与mac层csma/ca接入机制相结合,以改进mac层的冲突退避算法.设计了改进的退避算法和呼叫接入控制算法,以实现mac层与网络层的跨层技术.通过qos感知的资源分配算法和跨层技术协同工作,为qos服务提供了业务保障.仿真结果表明,cl-qara算法具有良好的收敛性和稳定性.与其他算法相比,cl-qara能够有效地提供qos保证,提高了网络的效用和性能.
On-demand Routing Protocol in Ad Hoc Networks Based on Price Awareness
一种基于价格感知的Ad Hoc网络按需路由协议

HAN Bing-qing,ZHANG Hong CHEN Wei,
,张宏,陈伟

计算机科学 , 2009,
Abstract: In wireless Ad Hoc networks main routing protocol parameters are hops,delay and energy etc,which lead to overload of central nodes and can cause network congestion.An on-demand routing protocol based on price awareness was proposed to deal with the problem.This protocol chooses price as the main parameter and uses cross-layer architecture.The method can obtain the same view of the whole network and can eliminate inconsistency of distributed prediction.The simulation results show that it improves the packet ...
Novel QoS-aware Multipath DYMO Routing Protocol in Mobile Ad Hoc Networks
一种新的QoS感知的Ad Hoc网络多径DYMO路由协议

HAN Bing-qing,CHEN Wei,ZHANG Hong,
,陈伟,张宏

计算机科学 , 2010,
Abstract: DYMO is a dynamic on-demand routing protocol in mobile ad hoc networks,which is a single-path routing protocol.But multi-path routing can support QoS better than single-path routing.Firstly,the advantages and problems of DYMO protocol were analyzed.Then a novel QoS-aware multi-path DYMO routing protocol(QA-DYMO) was proposed to provide QoS and multi-path routing which establishes and utilizes multiple routes of link-disjoint paths to send data packets concurrently.Finally,a QoS-aware routing algorithm was p...
Adaptive Peer-to-Peer Overlay for the Maximum Throughput
面向系统吞吐率最大化的P2P自适应覆盖网络

冯国富,张金城,,孙玉星,李文中
计算机科学 , 2012,
Abstract: The intrinsic value of P2P system is to improve the utility ratio of system resources and the system throughput,as well as to satisfy more data requests. In many unstructured P2P systems,the peers with high popularity weight in the overlay arc assigned with more connections, so as to receive more messages and hit more requests and finally to improve the search success rate. Due to the lack consideration of bandwidth, the peers with high weight are apt to be overloaded and the available services decrease. Therefore, the high success rate alone doesn't mean the high throughput and service availability. An optimization solution of overlay network was proposed in this paper to improve the throughput and the number of access customers, in which the connections are adaptively adjusted according to the available bandwidth and the popularity weight. Our simulations show that our method can improve the system throughput as high as 22% with low cost.
椭圆形盖格式索穹顶体系优化及初始预应力分析
,陈志华,,闫翔宇,王鑫
工业建筑 , 2015, DOI: 10.13204/j.gyjz201508004
Abstract: 虽然盖格式索穹顶构造简单、施工方便,在国内外圆形平面场馆中均取得了成功的应用,但在椭圆形平面场馆中的应用较少。结合力密度法及整体可行预应力概念,以天津理工大学索穹顶前期设计为背景,探索了椭圆形盖格式索穹顶初始预应力的确定方法,通过对三种不同索杆布置形式的初始预应力值的对比,可知边界不等高且环索随边界坡度变化的盖格式索穹顶通过采取合理的改进措施后,更能适用于椭圆形屋面。
基于液晶空间光调制器的偏振选择特性研究
陈捷,梁健,,冯少彤,聂守平,朱竹
南京师范大学学报(工程技术版) , 2012,
Abstract: 提出一种利用液晶空间光调制器实现二维光场偏振态编码与偏振态选择的方法,其基本思想是通过控制液晶空间光调制器上加载的灰度值改变出射光波的偏振态.对液晶空间光调制器改变光波偏振态的能力进行了研究,利用在空间光调制器不同区域上加载不同灰度对入射光波进行偏振态编码,在输出端实现了以偏振态作为条件进行选择输出.实验结果表明,该方法通过灰度编码能够产生包含两个偏振方向正交的出射光场,并且所组成的偏振选择衍射系统能够实现对衍射光场的偏振态选择.
基于服务级别协议的云资源分配
冯国富?,唐明伟?,刘林源?,
计算机科学 , 2014,
Abstract: 与网格、集群等传统计算模式不同,云计算为用户提供了一种利用远程计算资源的实用商业模型。在不同的客户之间动态分配云资源池以获得最大收入,成为云服务提供商最为关心的问题。云计算中心需要把面向客户的服务层指标转换为面向系统的操作层指标,根据服务级别协议动态管理云计算资源。研究了基于服务级别协议的服务提供商收入最大化问题,借助排队论模型对资源分配问题进行了形式化描述,然后依据定价机制、服务请求到达率、服务率、可用资源等因素给出了资源最优分配方案。实验结果表明,该算法优于相关算法。
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