Comparison of Alternative Channels in Cross Media Publishing

This paper attempts a direct comparison of the available alternative channels that can be employed in a cross media publishing scheme. More precisely it examines the content, the publishing speed, and the rhythm of the publishing channels. Interesting conclusions are drawn concerning the characteristics of each channel. A new publishing channel is proposed in order to allow newspapers to directly compete with radio and TV channels.     

无线传感网络中低碰撞概率协议研究

传感网络经常采用Flooding协议作为路由管理,但碰撞和重传会导致大量重复的数据包,造成有限资源的浪费.讨论了隐藏节点及邻居节点对碰撞的影响,并进行了仿真.结果表明当发射半径达到一定区域时,隐藏节点引起的碰撞数量达到一个峰值,从而可以通过合适的设计避免高碰撞概率的网络分布区域.另外,还可以通过增加传输延迟来减少节点碰撞.     

一种实现校园网络无线化的经济方案

无线局域网络具备有线介质网络所不具备的移动性和漫游功能的先天优势,对于建设真正意义上的信息化校园是必不可少的一环。经费投入大和实现技术要求高一直是困扰无线局域网进入校园的两大主要因数。本文提出一种较经济较简单的方案来基本实现校区网络的无线覆盖,在经济和性能之间取得了较好的平衡。     

Adaptive ant-based routing in wireless sensor networks using Energy*Delay metrics

To find the optimal routing is always an important topic in wireless sensor networks （WSNs）. Considering a WSN where the nodes have limited energy, we propose a novel Energy^＊Delay model based on ant algorithms （＂E＆D ANTS＂ for short） to minimize the time delay in transferring a fixed number of data packets in an energy-constrained manner in one round. Our goal is not only to maximize the lifetime of the network but also to provide real-time data transmission services. However, because of the tradeoff of energy and delay in wireless network systems, the reinforcement learning （RL） algorithm is introduced to train the model. In this survey, the paradigm of E＆D ANTS is explicated and compared to other ant-based routing algorithms like AntNet and AntChain about the issues of routing information, routing overhead and adaptation. Simulation results show that our method performs about seven times better than AntNet and also outperforms AntChain by more than 150% in terms of energy cost and delay per round.     

企业无线局域网的安全防护与应用

对无线局域网的安全防护及应用进行了研究,并采用预共享密钥(Pre-SharedKey,PSK)的Wi-Fi保护访问(Wi-FiProtectedAccess,WPA)身份验证和暂时密钥完整性协议(TemporalKeyIntegrityProtocol,TKIP)加密构建了安全无线局域网。     

Free-Space Optical communication using visible light

INTRODUCTION A growing and seemingly insatiable bandwidth demand in the marketplace is bring Free-Space Op- tical (FSO) technology into the carrier space as a means of broadband access for closing the “last mile” connectivity gap throughout metropolitan networks. Terrestrial short-range FSO systems which are gen- erally point-to-point links between buildings on the campus or different buildings of a company can be used to setup wireless communication networks or to supplement radio a…     

Hydrocarbon charging histories of the Ordovician reservoir in the Tahe oil field, Tarim Basin, China

INTRODUCTION Researches on hydrocarbon charging historyare essentially important to exploration and de-velopment, especially for the reservoirs subject tomultiple hydrocarbon generations, discharges, mi-grations and accumulations, as was the case of theOrdovician reservoir of the Tahe oil field located atthe southwest slope of the Akekule uplift, TarimBasin, China. Regarding the hydrocarbon charginghistories of the Ordovician reservoir, previousstudies based on burial histories (Y…     

无线局域网安全性研究

分析了无线局域网安全性方面的各种隐患,并对保障无线局域网安全所采取的各种技术,从其原理、结构方面作了安全性分析,同时制定相应的多重防范措施,使无线局域网更加安全地为我们提供服务。     

Modeling TCP performance with proxy and ARQ

INTRODUCTION The convenience of wireless communications has led to increasing use of wireless networks for civilian and critical applications. With the advent of Internet technology and the increasing popularity of wireless data devices, the wireless industry is evolv- ing its core networks toward IP-based networks. It will be necessary to integrate the wireless networks and the existing wired networks into the Internet. TCP has been the predominant transport protocol used in the wired …     

无线宽带网络技术:WiMAX技术综述研究

随着全球通讯领域宽带业务的蓬勃发展,出现了具有4G象征的WiMAX宽带技术。介绍了WiMAx的概念、技术特点及支持的业务类型,并对其未来发展方向及应用进行了展望。