计算机行业收入增速缓慢。2014 年1-2 月，计算机行业实现销售收入3222.7 亿元，同比增长-1.7%。1-3 月，全国电信业务总量完成4179.8亿元，同比增长15.2%；三家基础电信企业电信主营业务收入累计完成2908.3 亿元，同比增长6.5%，比2013 年同期回落2.6 个百分点。移动话音业务收入、网间结算收入的负增长是拉低整体收入增速下滑的主要原因。

Laser scanners are optical measuring systems based on laser light transmission. Terrestrial laser scanning is a new and efficient method for digitizing large object s and is used in surveys, which provides ways to acquire complex geometric data from buildings, machines, and objects.Terrestrial laser scanners provide a fast and accurate method of topographical surveying, giving deliverables such as spatial cloud data, DEM, DTM, contour maps and the raw data for databases and technical analysis. It is a ground-based technique to measure the position and dimension of objects in the three dimensional space. It provides benefits such as reduced costs,reduced waste, re-work, increased efficiencies, faster project completion times, improved information flow, improved decision making, and enhanced quality control.

The report covers the present scenario and the growth prospects of the Global EMC Shielding market for the period 2014-2018.

分布式定位是无线传感器网络研究中的热点问题.传统的分布式定位机制存在定位精度低,算法求解复杂等问题.为此,以与邻居节点集距离误差和作为效益函数,提出基于博弈论的分布式定位模型.给出了该博弈模型为潜在博弈的形式化证明,并从理论上证明了纳什均衡的存在性及最终收敛解的有效性.进一步,仅通过与邻居节点进行策略信息交互,提出基于潜在博弈的分布式定位算法.最后设计了博弈策略空间的决策机制与未知节点的升级机制,以避免陷入局部最优并加速收敛至全网最优解.一系列仿真实验验证了所提算法的有效性.

提出一种在2个时隙内对MIMO-AF协作两跳中继信道进行估计的方法。重点研究在信源发送功率和中继发送功率受限的约束条件下，运用MMSE准则构建信源至中继节点信道估计的优化问题，采用矩阵分解的方法将信号分解成酉分量和对角分量，简化代价函数。最后用二分法求出最佳的导频信号和中继放大系数。仿真结果表明,本方法能够得到确定的、精度较高的信道估计值，并分析了信道相关性、天线数目对信道估计的影响。

对于无线局域网的信号不仅希望在工作区域内覆盖良好,提供高速的接入服务,同时在工作区域以外希望信号迅速衰减,以避免通信内容被非法窃听等安全隐患,为此本文提出了一种基于智能天线的WLAN无线信号覆盖控制方法,首先设置区域内、区域边界、区域外三类传感器以及其接收信号场强的权值和目标值,利用粒子群优化算法,调整带智能天线的WLAN AP的波束组合和发射功率,从而达到使区域内信号场强最大、区域边界信号场强可接受、区域外信号场强最小的无线信号覆盖控制目的.通过仿真和原型平台验证,该控制方法达到了较好的覆盖控制效果. 

提出一个基于极限学习机ELM(Extreme Learning Machine)和文化基因算法MA(Memetic Algorithm)的微型四频(0.92/2.4/3.5/5.8GHz)天线设计算法AntMA-ELM.为了提高天线的性能,算法在MA框架下引入基于综合学习粒子群优化算法CLPSO(Comprehensive Learning Particle Swarm Optimizer)全局搜索和DSCG(Davies,Swann,and Campey with Gram-schmidt)局部搜索,用于确定天线的几何参数.同时,建立ELM回归模型用于直接评估MA优化的适应值函数.实验结果表明,ELM回归模型能够根据输入参数正确估算天线的回波损耗,使MA算法有效提高设计性能和加速优化过程.天线在四个目标频段的回波损耗值均优于-10dB,满足设计要求.

Navigation requires knowledge of current location and a planned destination. This is true with manned vehicles and unmanned vehicles. There are many ways to acquire the current location, including global positioning system (GPS), triangulation, radar, and dead reckoning. Today GPS is the most reliable and accurate navigation technique when there is a clear, unobstructed view of the satellite constellation. Various sensors can be used to perform indoor navigation; however, when the vehicle is autonomous the sensors need to provide the exact location to the system. This research determined if using a template replay strategy has the same RNR performance as using an analog noise source. Using the template replay approach, each RNR node has a priori knowledge about the transmitted waveforms of other nodes. The analysis here revealed that modifications do not significantly alter RNR functionality. The analysis revealed that even at SNIR equal to 0 dB, there are no parameters that can be reliably extracted other than transmitted signal bandwidth and transmitted template length; the transmitted message length was able to be extracted because the message was repeated over and over. If the message was not replayed the analysis showed that there would be no ability to extract parameters. Finally, by using the RNR to transmit digitally generated templates, digital communication is possible and the symbol error rate (SER) is traceable to simulated SER.