基于GPRS和VPN的农乡配电网远程数据采集系统

提出了一套新型的农乡配电网远程数据采集系统。分析农村地区传统通信方式所具有的建设成本高、数据丢失严重、抗干扰能力差等缺点。结合现代通信技术的发展现状,提出了以通用分组数据业务（GPRS）为数据传输平台,结合虚拟专网的隧道传输技术（VPN）的远程数据采集系统,克服了农村传统通信方式所具有的缺点。并针对数据通信的准确性进行了实验,实验表明,GPRS＋VPN的通信方式可以在混乱的公共网络中架设一条独立、安全、稳定的通信隧道,从而实现分布式的RTU与监控中心之间稳定的无线通信,大幅度提高了数据传输的可靠性和安全性。同时,结合上位机软件程序的开发,整个系统能够实现农村地区无人值守、低成本、低维修费用的配电网数据采集与通信系统。     

PLC在泵站群计算机远动系统RTU终端中的应用

以某泵站群计算机运动系统为实例，分析由PLC构成的泵站远方终端RTU的特点及功能。     

配电自动化项目技术综述

介绍了有关配电自动化的几个概念,对银河电力自动化公司配电自动化的项目技术从六个方面进行了 综述,指出了我国今后配电网的发展应注重的几个问题。     

东深供水改造工程分水点的监控

东深供水改造工程分水点共有30个，分属于3个子网；分水点的监控信息主要包括数字量、语音、图像等；每个量水闸RTU监控对象是分水点环网供电柜，分水流量计设备，流量调节阀，UPS供电设备等。     

基于SSX1014信息安全芯片的SCADA系统安全通信方案

介绍了采用信息安全终端芯片SSX1014作为远程测控终端安全通信部分的设计方案。该方案实现了分散式采集与控制系统（SCADA）数据服务器和远程测控终端（RTU）之间的安全通信机制,并设计了RTU端的软硬件通信接口。     

Monitoring of fresh-cut spinach leaves through a multispectral vision system

This paper reports the development of image processing methods for the detection of superficial changes related to quality deterioration in ready-to-use (RTU) leafy spinach during storage. The experiment was performed on spinach leaves stored at 4.5 °C for 21 days (Set 1) and at 10 °C for 9 days (Set 2). Regarding Set 1, 75 units were evaluated beginning at time zero and after 7, 14, and 21 days of storage (treatments t_1.0, t_1.1, t_1.2, and t_1.3, respectively). In the case of Set 2, 24 samples were measured at time zero and after 3, 6, and 9 days (treatments t_2.0, t_2.1, t_2.2, and t_2.3, respectively). Multispectral images were acquired using a 3-CCD camera centered at the infrared (IR), red (R), and blue (B) wavelengths. Opportune combinations of these bands were calculated using virtual images, and a non-supervised classification was performed. A large number of spinach leaves belonging to Set 2 showed injuries due to the effects of in-pack condensation; thus, an image algorithm was developed to separate these defective leaves before applying the classification. For Set 1, Set 2 and all the calculated virtual images, the classification procedure yielded two image-based deterioration reference classes (DRCs): Class A, including the majority of the samples belonging to t_1.0 and t_1.1 (Set 1) and to t_2.0 and t_2.1 (Set 2) treatments and Class B, which comprised mainly the samples belonging to t_1.2 and t_1.3 (Set 1) and to t_2.2 and t_2.3 (Set 2) treatments. An internal validation was performed, and the best classification was obtained with the virtual images based on R and B bands. For each sample, camera classification was evaluated according to reference measurements (visible (VIS) reflectance spectra and CIE L*a*b* coordinates); in all cases, VIS reflectance values corresponded well with storage days, and Classes A and B could be considered homogenous with regards to L* and a* values. Taken together, these results confirmed that a vision system based on R and B spectral ranges could constitute an easy and fast method to detect deteriorating RTU packed spinach leaves under different refrigeration conditions.     

CAN总线滴灌控制系统中远程终端控制器的设计

介绍基于CAN总线的棉花膜下滴灌自动化监控系统中远程终端控制器的设计,详细阐述其硬件和软件的设计思路和程序流程图。系统选用的远程终端控制器（RTU）结构简单,工作可靠,已经成功应用于棉田滴灌控制系统。     

一种基于STM32的温室SCADA系统

借鉴SCADA系统结构,讨论了一种温室环境监控系统,系统采用CAN/1-Wire分级网络,布线方便,运行可靠;RTU以基于ARM CORTEX-M3核的STM32处理器为核心,外围模块丰富,数据处理能力强;HMI采用CAN TO USB模块,软件设计灵活,安装使用方便,同时给出了系统结构和实现关键细节。