高速率WDM系统光信噪比（OSNR）计算方法及软件实现

通过对光信噪比（OSNR）的理论分析,提出了OSNR的计算方法,并在此基础上开发出计算工具以快速仿真出WDM系统OSNR值,从而能够更加严谨地验证系统建设方案的合理性。     

舱室密闭空间中爆炸载荷燃烧增强效应试验研究

为研究梯恩梯(TNT)爆炸产物的燃烧释放能量对密闭空间中的爆炸载荷增强效应,开展7.50 g、11.25 g、15.00 g、22.50 g、30.00 g 5种不同质量的TNT分别在空气和氦气环境（抑制燃烧）密闭空间中的爆炸试验。通过压力、温度传感器及三维数字图像相关技术,得到爆炸载荷历程、准静态压力、封闭空间内气体温度、金属板试件的动态响应和最终变形等试验数据。对试验结果的分析和对比发现：TNT爆炸产物的燃烧效应对封闭舱室内的爆炸载荷与结构响应影响显著,5种不 同质量TNT在氦气环境中爆炸的准静态压力、温度峰值相较对应的空气工况中的降幅分别在38.81%~46.85%和57.53%~76.35%;试件最终变形较空气工况的降幅在19.1%~48.9%;建议在结构内爆响应的计算评估中应考虑爆炸载荷燃烧增强效应的影响。     

战术数据链网络的介质访问控制层优化控制及性能分析

为解决战术数据链中优先级问题,提出一种基于完全接入策略和非对称门限接入策略的区分优先级两级轮询控制策略,用于战术数据链网络的媒体接入控制中。在该轮询控制策略中,对战术数据链中的低优先级前哨站点采用非对称门限接入策略,对高优先级前哨站点采用完全接入策略;在网络控制站点由高优先级前哨站点转低优先级前哨站点时,将传输服务与转移查询并行处理来降低查询转换期间所耗费的时间,提高轮询系统的效率。运用马尔可夫链和概率母函数方法建立了系统的数学模型,精确解析出各个前哨站点内等待发送的平均信息分组数表达式。结合循环周期2阶特性量近似方法,解析出前哨站点内信息分组平均等待发送时间的近似表达式。仿真实验结果表明,实验值与理论值大致相等且高优先级前哨站点的服务质量优于其他站点,证明理论分析正确,该模型达到了区分优先级的目的。     

关于通信设备的直流电缆截面的选择

目前正在运行的通信设备的直流电缆截面太大,安装和维护时施工困难,浪费投资,而且实际的负载电流偏小,压降很低.希望设计单位和设备厂家能够对通信设备的电压降重新进行整定和计算,将电缆截面降低到最小程度.在不影响设备正常运行的条件下,降低施工难度、节省投资.     

机器人自动控制中的问题研究

机器人自动控制是机器人技术的关键与核心,是当前机器人领域研究的热门课题。针对开展相关研究的迫切需要,总结了机器人自动控制中存在的主要问题,并从单机器人简单动作控制到多机器人复杂动作协调控制,最后到机器人控制精度,进行了问题分析。重点从机器人路径规划,运动过程中的惯性矩控制,多机器人协调控制以及基于多传感器信息融合算法提升机器人控制精度这4个方面出发,对机器人自动控制中存在的主要问题展开论述,并提出了相应的解决方案。     

MULTI-LEVEL FILTER FOR INFRARED IMAGE PROCESSING

This paper presents a new multi-level filter algorithm and its corresponding VLSI architecture for infrared image processing. The algorithm eliminates the phenomena of splitting targets by inserting Gaussian pyramid processing. Owning three filter paths, the proposed filter VLSI architecture can enhance small targets with different size in infrared images. This architecture has been implemented using SMIC 0.35μm 4-layer CMOS technology. The test result shows that the filter chip not only effectively suppresses background, eliminates noise and enhances small targets in an infrared image, but also meets infrared image real-time processing requirement(5M ～ 10M pixels/s). The implemented filter chip consists of 60,284 gates and 8K SRAM, operates at 50MHz.     

技术创新是推动电子企业发展的重要力量

技术创新是现代电子企业实现发展不可或缺的重要手段,它不仅可以为电子企业带来高额利润、还可促使电子企业不断降低生产成本以及为满足消费者求新求变的升级需求提供支持,是电子企业发展壮大的重要推动力量。但目前我国电子企业由于还存在着诸如技术创新体制不完善、不善于开展创新合作及人才流失严重等问题,因此还需要不断完善技术创新体制、加强技术合作、找准技术创新方向以及创造出留住人才的企业环境,如此,才可促使我国电子企业不断突破原有技术,不断发展壮大。     

A novel Smith-Purcell free electron laser

An experiment on a novel Smith–Purcell free electron laser (FEL) is described in this paper. The FEL is driven by a relativistic sheet electron beam of middle energy. The high frequency system of the device is a quasi-optical resonator composed of a diffraction grating and a three-mirror reflector. Coherent radiation with a peak power of tens of kW at the 3 mm waveband is sucessfully detected from an experimental facility. The main experimental parameters are: sheet beam energy from 400 kV to 500 kV; pulse length of voltage 70 ns; pulse beam current 0.2 kA; synchronous guide magnetic field up to 1.2 T with 10 ms pulse length; and grating period 2.2 mm.     

Rate adaptive resource allocation in orthogonal frequency division multiple access system using multi‐objective immune algorithm

Rate adaptive downlink resource allocation in orthogonal frequency division multiple access system is a constraint optimization problem, which is to maximize the minimum data rate of the user subject to constraint that total power cannot exceed a given value. How to handle the constraint is a key issue for constrained optimization problem. Different with the available schemes on constraint handling, the proposed algorithm converts the constraint into an objective. Then, the resource allocation is combined into a multi‐objective optimization problem. An improved multi‐objective optimization algorithm based on artificial immune system is proposed to solve it. The simulation results show that, compared with previous schemes, the proposed algorithm performs remarkable improvement in sum capacity. Copyright © 2013 John Wiley & Sons, Ltd.