三种无线分布式网络的比较

无线分布式网络近年来受到了越来越广泛的关注，adhoc网络、无线传感器网络和无线Mesh网络是目前无线分布式网络中最具代表性的3种类型。本文着重对这3种无线分布式网络的基本概念、技术特点和应用场合进行了分析研究和比较。     

无线传感器网络系统综述

介绍了无线传感器网络的概念、几种主要的无线传感器网络协议，尤其是MAC层协议的研究情况，给出了一些比较经典的无线传感器网络MAC协议的思想。     

基于无线Mesh技术的宽带无线接入网络

无线Mesh网络（WMN,Wireless Mesh Network）是一种新型的宽带无线网络,是大容量、高速率的分布式网络,支持宽带高速多媒体业务服务。随着网络多媒体、视频会议等对实时性要求较高业务的普及,人们对接入网络的带宽以及实时性要求日渐提高。文章就无线Mesh网络技术进行讨论．简述无线Mesh网络的基本特点,网络构成,特点及优势,重点分析了基于无线Mesh技术的宽带无线接入网络在现实生活中的典型应用。     

中科院研制出传感器网络解决方案

一项无线倾角传感器网络解决方案最近南中国科学院上海微系统与信息技术研究所推出。该所微系统信息网研发中心的这项解决方案是由MEMS倾角传感器和MSN微无线传感器网络组成的。MSN微无线传感网络是一个适用于多种行业、多级距离、无线传输、以数据处理为主的无线传感器网络，日前已经发展形成多个系列。每个系列由若干微网端机组成，网络的规模和性能可以根据位用要求灵活定制。     

基于传感器网络的信息广播系统关键技术研究

无线传感器网络技术是一种由电子、无线通信、嵌入式等多种技术综合而成的新型技术，将无线传感器网络技术应用于信息广播系统中，能够更好的发挥其在数据采集和感知环境等方面的作用。目前，该项技术已经逐渐成为信息广播系统的数据基础和关键技术。基于此，本文探讨了一种基于传感器网络的信息广播系统关键技术。     

无线传感器网络及能耗策略

无线传感器网络是一种全新的信息获取和处理技术，本文介绍了无线传感器网络的节点和网络结构，对最受关注的参耗策略及相关数据链路层协议，网络层路由协议做了比较详细的叙述。     

无线Mesh网络网关负载均衡研究综述

无线Mesh网络是无线局域网和移动自组织网络相结合的产物，作为一种能够提供高带宽网络接入服务的全新架构的网络，无线Mesh网络目前越来越多的得到人们的重视。本文对近年来Mesh网络网关节点负载均衡的研究方向进行了归纳总结，并提出了自己的设想和方向。     

基于CC2430的无线传感器网络的实现

无线传感器网络是一项新兴的技术,具有广泛的应用领域。在简单介绍无线传感器网络的概念及其特点的基础上,着重讨论基于ZigBee技术和433 MHz无线射频技术的无线传感器网络的实现方法,包括无线传感器网络的硬件和软件设计。ZigBee是一种具有全球统一标准的自组织网状网,网络容量大、组网灵活。多个ZigBee网络的协调器节点通过433 MHz无线射频组成星型网,有效地扩大了传感器网络的地理覆盖范围。实验结果表明,网络节点及整体网络均获得了良好的性能,验证ZigBee是实现无线传感器网络的理想解决方案。     

基于二进前向神经网络的Ad Hoc网络节点识别方法

提出了一种基于二进前向神经网络的无线移动Ad Hoc网络节点识别方法。安全问题是无线移动Ad Hoc网络的一个关键性问题，路由协议的安全尤为重要，本文针对恶意节点的主动攻击提出了一种基于二进前向神经网络的无线移动Ad Hoc网络节点识别方法，该方法可以有效的避免恶意节点接入网络，从而提高了网络路由的安全性。     

飞田通信出租汽车智能调度管理系统

CDMA 1X是一种新一代无线数据通信方式，目前已由中国联通在全国范围铺开。使用现有的覆盖全国主要地区的CDMA 1X无线公共网络，不需单独建网。CDMA 1X无线公共网络具有基本无盲点，同时支持话音通信和数据通信，容量大，传输速度快，网络传输延迟小，一次登录永远在线，按照数据流量收费等特点。     

一年之间，物换星移

去年的这个时候,供货商们还在为生存而挣扎。如今,2009年的年报已经公布,许多供应商的年报业绩之好,就连最乐观的分析师也始料未及。这种变化的原因很简单：供应商们大幅削减成本,接下来是强劲的需求,这又导致了随后高企的设备利用率。     

Building a in a flash supercomputer

A flash mob is a group of strangers, organized over the Internet, that comes together briefly, acts out a predetermined scenario-often something as simple as clapping for 30 seconds-and then disperses. A supercomputer is a very fast and powerful computer that outperforms most mainframes, at a cost, typically, of millions of dollars. Can a flash mob build a supercomputer? It can sure try, and so it did on 3 April at the University of San Francisco's Koret athletic center. The goal was to run the Linpack benchmark, a standard method of assessing the speed of supercomputers, to achieve a speed of at least 403 gigaflops (billion floating point operations per second). This would be fast enough to earn the system a place on the list of the world's fastest 500 supercomputers. The goal was not reached. The group reached just 180 gigaflops before it was time to pack up the computers and go home. However, even though the San Francisco effort fell short of speed goal, it did ignite imaginations.     

On a wing and a prayer

Aircraft giants Boeing and Airbus are pinning their hopes on very different visions of how air travel will evolve in the coming decade.     

Cooperative control of a human and a robot manipulator for positioning a cart on a frictionless plane

Robots may be expected to execute some tasks in cooperation with humans. Control systems for such robots should be appropriate to adapt to human characteristics in order to successfully accomplish the task. Pushing a cart on a frictionless plane in cooperation with a human is a basic example to such a task. To control the motion of an object from one point to another on a frictionless plane is impossible by only pushing in one direction without supporting it in the opposite direction, since as soon as the force is applied, the object will move without stopping its motion. In this paper, compliant cooperative positioning of a cart on a frictionless plane by a human and a manipulator is proposed using impedance control method with the parameters obtained from human–human cooperation.     

Analysis of a coaxial-to-waveguide adaptor including a discendedprobe and a tuning post

A field matching analysis of a coaxial-to-waveguide adaptor incorporating a disc-ended probe and a tuning post is presented. In this analysis, the tuning post is considered as a short-circuited second probe. A computer algorithm for calculating the input impedance of this structure is developed. This algorithm is used to investigate and improve the operation of a commercially available coaxial-to-waveguide adaptor     

Transmission-Line Properties of a Strip on a Dielectric Sheet on a Plane

The subject is a strip Iine formed of a strip and a parallel ground plane separated by a dielectric sheet (commonly termed "microstrip"). Building on the author's earlier papers all the significant properties are formulated in explicit form for practical applications. This may mean synthesis and/or analysis. Each formula is a close approximation for all shape ratios, obtained by a gradual transition between theoretical forms for the extremes of narrow and wide strips. The effect of thickness is formulated to a second-order approximation. Then the result is subjected to numerical differentiation for simple evaluation of the magnetic-loss power factor from the skin depth. The transition formulas are tested against derived formulas for overlapping narrow and wide ranges of shape. Some of these formulas are restated from the earlier derivations and others are derived herein. The latter include the second-order approximation for a narrow thin strip, and a close approximation for a narrow or wide square cross section in comparison with a circular cross section. Graphs are given for practical purposes, showing the wave resistance and magnetic loss for a wide range of shape and dielectric. For numerical reading, the formulas are suited for programming on a digital pocket calculator.     

基于智能手机压电基片上微液滴位置分析章

为了降低微流分析成本,该文提出了基于智能手机检测压电基片上目标微液滴方法,并开发出相应的应用软件,通过分析微液滴颜色信息和几何信息定位目标微液滴位置,结合分析时间获取微液滴输运速度。为验证提出方法的正确性,以5 μL黑色墨水溶液微液滴为研究对象,进行压电基片上微液滴识别和位置分析实验。结果表明,该文所提方法和开发的应用软件可识别和定位压电基片上微液滴,在功率为27.5 dBm时,第2~10 s段内微液滴输运速度为0.416 mm/s。     

构建完整工业ADC接口的微控制器和调制器

设计师们通常使用0mA～20mA和0V～10V的隔离输入作为工业应用控制的信号.由隔离电源、Analog Devices AD7400调制器内置隔离及TexasInstruments MSP430微控制器共同为工业设计师要求的一种完整、隔离且可靠的模拟信号接口创建一种设计.