基于电力线载波与GPRS通讯的公共路灯控制系统

基于电力线载波与GPRS通讯技术，阐述了公共路灯智能控制及管理系统的硬件组成及其原理，给出了该系统的软件结构及其基本思想．     

基于深度学习模型的无线传感器网络数据融合算法

为了在无线传感器网络中提高数据融合性能,基于深度学习模型,提出一种将层叠自动编码器(SAE)和分簇协议相结合的数据融合算法SAEMDA,该算法在各个簇内构建特征提取分类模型SAEM,通过SAEM对节点数据进行特征提取和分类,之后将同类特征融合并发送给汇聚节点。SAEM的训练既可以采用离线有监督学习也可以采用在线无监督学习。仿真实验表明:和BPFDA,SOFMDA算法相比,SAEMDA在网络能耗大致相当的情况下能将数据融合正确率提高最多7.5%。     

基于VB6.0的单片机与PC通讯的实现与应用

如何利用微机来实时监控工业现场，将被越来越多的企业所重视。为了达到用PC机与单片机通讯实现控制工业现场的目的，研究并分析了基于VB6．0的可视化性和通讯控件以及与单片机关于串行通信原理和程序设计特点，结合实例介绍了单片机与PC机的串口通讯，通过指令和数据的传送来控制工业对象的方法。通过实例可见取得了相应程序的应用效果，本研究的方法结论是：产品应用的代码具有广泛的应用价值，稍加改动即可用于其他系统。     

Fat-tree routing and node ordering providing contention free traffic for MPI global collectives

As the size of High Performance Computing clusters grows, so does the probability of interconnect hot spots that degrade the latency and effective bandwidth the network provides. This paper presents a solution to this scalability problem for real life constant bisectional-bandwidth fat-tree topologies. It is shown that maximal bandwidth and cut-through latency can be achieved for MPI global collective traffic. To form such a congestion-free configuration, MPI programs should utilize collective communication, MPI-node-order should be topology aware, and the packet routing should match the MPI communication patterns. First, we show that MPI collectives can be classified into unidirectional and bidirectional shifts. Using this property, we propose a scheme for congestion-free routing of the global collectives in fully and partially populated fat trees running a single job. The no-contention result is then obtained for multiple jobs running on the same fat-tree by applying some job size and placement restrictions. Simulation results of the proposed routing, MPI-node-order and communication patterns show no contention which provides a 40% throughput improvement over previously published results for all-to-all collectives.     

Broadband MIMO Antenna System for 5G Operations in Mobile Phones

A broadband 8‐antenna multiple‐input and multiple‐output (MIMO) system working for 5G new radio N77 (3.3‐4.2 GHz) in mobile terminals is proposed. In particular, each antenna element/unit consists of a monopole‐type meandered branch and an inverted U‐shaped self‐isolated antenna branch; and the antenna unit is fed by the meandered branch. The antenna unit has two resonances generated separately by each branch of the antenna unit. Since the monopole couples strongly with the self‐isolated antenna element that has the inherent self‐isolation characteristics, quite good isolation for the broadband 8‐antenna MIMO system can be obtained. The results such as antenna efficiency, radiation patterns, envelope correlation coefficient, and channel capacity are also presented.     

数控机床的联网通讯与程序管理应用实例

介绍了数控DNC的功能特点,机床联网的实施方案、系统维护以及应用实例。     

EBPSK调制通信系统中非线性检测的研究

主要讨论扩展的二元相移键控（EBPSK）调制通信系统中的检测技术,以实现高频谱利用率的同时降低能耗。针对高效调制信号码元间差异性较小的特点,接收机利用特殊的冲击滤波器（SIF）将相位变化转化为寄生调幅,增加码元间的差异性,提高能量利用率。同时,引入了支持向量机（SVM）非线性检测方法,解决EBPSK系统中门限检测性能难以达到最优的问题,并给出了维数较少的统一特征向量选取方法。为了减少计算量,选择适用于EBPSK系统的SVM核函数并优化计算方法。仿真结果表明,SVM非线性检测在较少的特征向量维数和低采样率的条件下,可获得最多7 dB的信噪比增益。因而,在EBPSK调制通信系统中选择SVM方法不仅可以提升检测性能,而且抗干扰能力更强,对采样率的鲁棒性更好。     

串口通信在CAD/CAM系统中的设计与实现

串行口通信是终端与计算机或计算机之间进行数据通信的一种方式，在工业上发挥着重要的作用。具有传输距离远、传输稳定、简单实用等特点。论述了在三维造型软件平台上(JHSolid)的CAM模块中串口通讯的实现。应用VisuaI C 结合CSem aJPort类实现自动侦测串口、在数控机床与PC之间进行数据及文件的传输等功能，并讨论该系统的基本原理和具体实现。     

Efficient visual communication channels

This paper compares the efficiency of uniform quantization in the spatial domain with frequency dependent quantization in the spatial frequency domain, in the context of the end-to-end performance of visual-communication channels. Results show that the minimum data density required for informationally lossless transmission depends on the design of the image-gathering device. The information in the acquired signal, not the energy, dictates the trade-off between data transmission and visual quality. Frequency dependent quantization that maintains the information capacity of the channel while reducing the entropy of the encoded signal, improves its information efficiency. Information bit-allocation is preferable for optimized visual communication for restoration, whereas energy bit-allocation can be used only for image reconstruction.This research was supported by NASA Task Assignment NAS1-18584-90 with the Department of Mathematics, Old Dominion University, Norfolk, Virginia 23529.     

PROCONTROL-P控制系统人机接口分析与改造

对南阳鸭河口电厂MMI系统存在问题进行了分析,提出相应改造方案并对2台机组PROCONTROL-P系统MMI进行了升级改造。改造采用通用PC及主流操作系统,并采用先进可靠的快速网络技术,有效地提高了现有PROCONTROL-P控制系统的安全可靠性和设备的技术水平,大大降低了系统维护成本。