为了提高车辆自组织网络(Vehicular Ad Hoc Network,VANET)的数据传输效率,并使车辆间的数据通信能够持续进行,提出一种多向链路感知的车载Ad Hoc网络传播协议。为了保证车辆节点在执行通信任务的过程中实现数据的持续传输,防止通信链...为了提高车辆自组织网络(Vehicular Ad Hoc Network,VANET)的数据传输效率,并使车辆间的数据通信能够持续进行,提出一种多向链路感知的车载Ad Hoc网络传播协议。为了保证车辆节点在执行通信任务的过程中实现数据的持续传输,防止通信链路频繁断连影响传输质量,提出了车辆网络的时间关联模型来讨论车辆间的速度差与通信持续时间的关系。为了缩短VANET中用于数据传输任务的总时间,协议基于改进蚁群的方法进行了多向链路感知,从而寻找在保证通信需求时间下的最短传输路径。实验结果分析表明,相比基于改进地理信息路由和基于优化链路状态路由的VANET数据传输算法,该算法的数据传输任务完工时间分别缩短了38.4%和27.3%,平均传输延迟分别降低了25.5%和12.1%。展开更多
Mass Communication media were widespread in 19th and 20th centuries. Those technologies created by humans have had a big impact on both daily and business lives. Newspapers, Radio, TV and Cinema are obvious examples o...Mass Communication media were widespread in 19th and 20th centuries. Those technologies created by humans have had a big impact on both daily and business lives. Newspapers, Radio, TV and Cinema are obvious examples of this impact. Dinting the last two decades of 20th century, spread of personal computers transformed the way people live0 work and think. Some people evaluated the situation as revolution and others as threat to humans. Intemet, in this respect, is considered as mass media. People connect the Internet without time and space limitations. However, communication on the Internet is not mass commtmication because it requires every individual or organization to have a unique Intemet Protocol address （IP） to commtmicate. Because of its peer to peer communication nature just as in the telephone communication, this feature distinguishes Intemet from other commtmication media. On the other hand, it resembles mass communication media because of its mobility, spread and functionality both for sender and receiver. In many sectors, including communication and information technology sectors, mobility, spread and functionality features lead the way to increase interactivity between parties in communication. Businesses benefited the ＂interactivity tool＂ for many purposes： to increase market share for a product or service, to increase customer satisfaction, or to increase amount of information about their customers, competitors or suppliers in order to make strategic decisions. For journalism and generally, for mass media, interactivity is an important aspect of the business. Media corporations must know the needs of their audience before they express and take precautionary steps to satisfy them. This forces the mass media sector to increase interactivity in customer communication. In this paper, we researched the intemctivity effect in journalism that we see especially in internet journalism applications. The research aims to cover opinions of newspapers, advertisers and audience on interactivity and future of mass media communication. For this purpose, fmdings of a survey have been evaluated.展开更多
Wireless sensor networks have a wide range of applications. Sensing coverage and communication coverage are two fundamental quality of service. In this paper, we present our work on energy efficient sensing coverage a...Wireless sensor networks have a wide range of applications. Sensing coverage and communication coverage are two fundamental quality of service. In this paper, we present our work on energy efficient sensing coverage and communication. We design several schemes for sensing coverage subject to different requirements and constraints respectively. We also propose a broadcasting communication protocol with high energy efficiency and low latency for large scale sensor networks based on the Small World network theory. Simulation and experiment results show that our schemes and protocol have good performance.展开更多
文摘为了提高车辆自组织网络(Vehicular Ad Hoc Network,VANET)的数据传输效率,并使车辆间的数据通信能够持续进行,提出一种多向链路感知的车载Ad Hoc网络传播协议。为了保证车辆节点在执行通信任务的过程中实现数据的持续传输,防止通信链路频繁断连影响传输质量,提出了车辆网络的时间关联模型来讨论车辆间的速度差与通信持续时间的关系。为了缩短VANET中用于数据传输任务的总时间,协议基于改进蚁群的方法进行了多向链路感知,从而寻找在保证通信需求时间下的最短传输路径。实验结果分析表明,相比基于改进地理信息路由和基于优化链路状态路由的VANET数据传输算法,该算法的数据传输任务完工时间分别缩短了38.4%和27.3%,平均传输延迟分别降低了25.5%和12.1%。
文摘Mass Communication media were widespread in 19th and 20th centuries. Those technologies created by humans have had a big impact on both daily and business lives. Newspapers, Radio, TV and Cinema are obvious examples of this impact. Dinting the last two decades of 20th century, spread of personal computers transformed the way people live0 work and think. Some people evaluated the situation as revolution and others as threat to humans. Intemet, in this respect, is considered as mass media. People connect the Internet without time and space limitations. However, communication on the Internet is not mass commtmication because it requires every individual or organization to have a unique Intemet Protocol address （IP） to commtmicate. Because of its peer to peer communication nature just as in the telephone communication, this feature distinguishes Intemet from other commtmication media. On the other hand, it resembles mass communication media because of its mobility, spread and functionality both for sender and receiver. In many sectors, including communication and information technology sectors, mobility, spread and functionality features lead the way to increase interactivity between parties in communication. Businesses benefited the ＂interactivity tool＂ for many purposes： to increase market share for a product or service, to increase customer satisfaction, or to increase amount of information about their customers, competitors or suppliers in order to make strategic decisions. For journalism and generally, for mass media, interactivity is an important aspect of the business. Media corporations must know the needs of their audience before they express and take precautionary steps to satisfy them. This forces the mass media sector to increase interactivity in customer communication. In this paper, we researched the intemctivity effect in journalism that we see especially in internet journalism applications. The research aims to cover opinions of newspapers, advertisers and audience on interactivity and future of mass media communication. For this purpose, fmdings of a survey have been evaluated.
基金The research is supported in part by National Natural Science Foundation （No. 60574087, 60574064） and the ＂111 International Collaboration Project＂ of China.
文摘Wireless sensor networks have a wide range of applications. Sensing coverage and communication coverage are two fundamental quality of service. In this paper, we present our work on energy efficient sensing coverage and communication. We design several schemes for sensing coverage subject to different requirements and constraints respectively. We also propose a broadcasting communication protocol with high energy efficiency and low latency for large scale sensor networks based on the Small World network theory. Simulation and experiment results show that our schemes and protocol have good performance.
