基于BWAS的无线传感器网络静态分簇路由算法

为提高路径搜索效率,避免动态分簇较多的能量消耗,提出了基于最优-最差蚂蚁系统(BWAS )的无线传感器 网络静态分簇路由算法。BWAS是对蚁群算法的改进,在路径搜寻过程中评价出最优最差蚂蚁 ,引入奖惩机制,加快了路径搜索速度。通过无线传感器网络静态分簇、簇内动态选举簇头 ,在簇头节点间运用BWAS算法搜寻从簇头节点到汇聚节点的多跳最优路径,能减少路径寻优 能量消耗,实现均衡能量管理,延长网络寿命,且具有较强的鲁棒性。通过与基于BWAS的 动态分簇和基于蚁群算法的动态分簇路由的仿真实验相比较,证实了本算法的有效性。     

一种基于UAV的无人海岛监控网络数据收集策略

针对传统的最小跳路由无线传感器网络（WSN）在数据汇聚上较高的能量开销问题，提出了一种基于无人机(UAV)数据收集的动态分簇算法,其主要思想是利用节点剩余能量来确定那些节点可以当选簇首,同时利用节点坐标位置和设定地分簇半径来划分簇的大小。该算法的优势是能最大程度地均衡每个传感器节点的能量，使整体的节点剩余的能量维持在同一水平。为了提高数据收集的效率，采用蚁群算法规划了无人机数据收集的最短路径。仿真结果表明，与相同的分簇算法下传统的最小跳路由无线传感器网络相比，所提出的基于无人机的无线传感器网络（UAV-WSN）在能量利用率和生命周期方面分别提升了15%和25%，并且以上两种网络的能量利用率高达70%。     

无线传感器网络能量高效混合MAC算法

针对无线传感器网络MAC协议中存在的能耗问题,提出了能量高 效的无线传感器网络混合MAC（EEH-MAC）算法,采用基于TDMA机制的时槽系数动态调整簇内 节点的时槽大小来降低数据的传输时延;同时,对部分不需要数据传输的节点不分配时槽来 减少能耗;按簇内节点剩余能量系数形成时槽分配顺序来减少状态转换的能耗;在簇头之间 采用CSMA/CA机制的随机分配策略进行通信。仿真结果表明,EEH-MAC协议能有效减少能耗并 延长网络生命周期。     

基于信誉模型的无线传感器网络恶意节点识别方法

无线传感器经常工作于开放外部环境中,如何识别恶意节点对保证无线传感器网络安全高效工作有重要意义。建立无线传感器网络的信誉评测模型,引入贝叶斯公式计算信誉,最后经过拟合分析得到节点的信誉服从Beta分布,通过节点之间彼此交换信誉信息,计算直接信誉和间接信誉的整合之后的信任值与信任阈值进行比较判断节点是否为恶意节点。仿真结果表明该模型在小型无线传感器网络中对恶意节点具有较高的捕捉率。     

无线传感网混合类MAC协议研究综述

在无线传感网(WSN)体系结构中，介质访问控制(MAC)协议负责调配网络中节点的信道接入，具有保障网络高效通信的重要作用。混合类MAC协议综合了竞争类MAC协议以及调度类MAC协议的特点，在融合两种机制的优点的同时克服其缺点，为无线信道资源的分配提供了更加灵活和全面的策略。首先概述了无线传感网MAC协议设计要点及分类，然后重点分析了无线传感网中经典的混合类MAC协议及国内外前沿的研究进展，并进一步归纳对比了各协议运行机制、性能及不足，得出混合类MAC协议的应用相关性及差异性的结论，最后总结了无线传感网混合类MAC协议研究现状并指出了未来的研究重点，以期为相关领域的研究人员提供参考。     

一种干扰最小化协作波束形成节点选择方法

针对无线传感器网络（Wireless Sensor Network,WSN）对周围无关基站造成干扰的问题,提出了一种基于禁忌搜索的协作波束形成节点选择方法。该方法以协作节点的组合方式为优化变量,以降低无关基站方向的波束能量增益为优化目标,能够在约束节点个数的条件下优化协作节点集,减小WSN对无关基站的干扰。仿真结果表明,所提方法能够有效降低协作波束形成在无关基站方向上的能量增益,与随机搜索算法、遗传算法和免疫算法相比,参数设置简单,寻优效率更高。     

高动态无线自组网路由协议设计

针对节点快速移动过程中网络建立时间较长,数据端到端传输时延无法得到可靠保 障,并且由于维护动态网络连接性造成网络开销较大等方面的问题,提出了一种无线自组网 路由协议,通过分簇算法快速将网络分为多个簇,每个簇包括簇首节点、成员节点和簇间网 关节点。该协议能够应用于快速移动节点构成的高动态无线自组织网络中,实现了先应式和 反应式路由算法进行了有机结合,能够在快速变化的拓扑结构中为未知路由提供优化的路由 结果,利用较小的网络开销实现网络快速构建和数据端到端的实时传输。     

无线传感器网络UDHR协议的设计与实现

针对无线传感器网络(WSN)数据流的特点,提出一种WSN上下行路由异构的协议(UDHR),上下行路由可采用不同的算法,适合于时间驱动、事件驱动以及查询的数据收集模式.利用OMNeT++平台对UDHR协议进行建模仿真,结果表明该协议开销小、扩展性好、健壮稳定.并且在自主开发的Testbed平台上实现了该路由协议,利用该平台可实时观察整个WSN网络拓扑变化、网络开销、监测每个节点能量消耗以及数据收集等情况.     

分裂无线传感器网络路由协议综述

无线传感器网络中,由于节点能量与通信距离的限制以及节点受到恶劣天气与环境变化等因素的影响,节点间的通信会出现间隔性,甚至直接导致分裂网络的产生。本文在介绍分裂无线传感器网络的基础上,对解决分裂网络节点或区域间通信问题的路由算法进行了综述,着重介绍了一些具有代表性的路由协议。     

一种改进的高效无线传感器网络查询方法

文章以无线传感器网络中查询路由表产生大量数据冗余,所要消耗较多的能量为出发点,通过提出的改进方法,延长无线传感器网络(WSN)的生命周期,通过仿真实验结果表明,所提出的改进查询方法优于原来的方法,降低了能量消耗,提高了查询的准确性。     

Brown＇s Blossom in Britain-China

The overall strategic relationship between U.K. and China is ＂better than ever＂, China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future.     

Challenge and Opportunity Go Hand in Hand——What Global Economic Agitation Brings to the China's Economy?

Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit.     

Sinosteel：Extraordinary Moves in Industry Chess

Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service ＆ trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,＂In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves.＂     

Walk Through Unusual Five Years—— An Exhibitor＇s Canton Fair Course

When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years＇ experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year.     

Jean-Pierre Duprieu： Willing to Be A Legate of Sino-French Business

Estaing, former French president, Valery Giscard d＇Estaing attended Sino-French Economic Seminar held in Shanghai in early April and said that the world center has shifted from the west to the east with many European and US companies entering into Asia, and China has the ability to play an important role in the world stage. Estaing, naming himself＂French Confucian＂, then said in Chinese that a cook-group includes 10 people in ancient Chinese soldier system and the cook is in charge of cooking for them. And people who belong to the same cook are actually ＂Partners＂.     

China''''s Stock Market Wave

The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy.     

Trade Promotion from Neighborhood

If you are considering to trade with companies in Japan or expanding your .business to Japan, we are ready to help from the very beginning.＂ You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization （JETRO）. JETRO has committed itself in delivering highly efficient and quality services to meet the demand of internal and external customs including Japanese companies, hence winning a good reputation in the international trade arena. In recent years, with its priority in advancing business cooperation in South and East Asia, JETRO has made great achievement in promoting trade between China and Japan. Therefore, China＇s Foreign Trade interviewed Mr. Yoichi Maine, Deputy Director General of JETRO BEIJING.     

Auto Parts Market Potential Coming into Surface

Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship,     

Public Financial Expenditure——A Reflection of the Livelihood Improvement

In recent years.China's public finance put social construction high on the agenda and attaches more importance on livelihood insurance and improvement.The 2003-2007 public financial expenditure reflects a fact that the government isputting more emphasis on livelihood andissues concerning the people.     

Voices from the MPC and CPPCC

"Crucial for economic growth.energy utilization has its role in all economic sectors and every aspect of people's daily life.Now we are in dire need of a new profession,namely energy manager.We not only need to have passion and responsibility,but also a scientific approach to conserve energy and cut emissions.APpropriate legislation should be in place.and a special profession should be introduced to ensure the implementation of these laws and regulations."