基于物联网的物流车辆监控系统的设计与实现

论文基于物联网的基本概念和体系结构,对物流车辆监控系统的原理、系统硬件总体框架、系统软件总体框架结构的设计和系统实现的关键技术进行了介绍,该系统能实现GPS定位跟踪、运输路线指挥、累计重量报表输出、历史数据查询和实时情况追踪等功能,能有效地解决运输任务的监控和管理,从而大大提高了运输任务管理的效率。     

视频质量客观评估方法分析

文章简单介绍了视频监控系统的应用,指出了视频质量主观评估的缺点,并按不同的分类分析了常用的视频质量客观评估方法,在此基础上探索了一种视频质量无参评客观估方法的思路。     

Closed-loop drip irrigation control using a hybrid wireless sensor and actuator network

In this research, a closed-loop drip irrigation control hybrid wireless sensor and actuator network (HWSAN) prototype were developed and deployed in a crop field for soil property precise measurement and precision irrigation in accordance with the measured soil property. The HWSAN was composed of a wireless sensor and actuator network (WSAN) used for in-field soil property monitoring and irrigation control and a laboratory supervising system. The WSAN included ten sensor nodes, five irrigation control nodes...     

能源管理系统实施中供配电系统改造方案

针对钢铁企业能源管理最基本的供配电系统以及供配电系统改造的内容作了较为详细的介绍。根据供配电系统的变电站现场配置情况,提出了供配电系统的3种改造方案,并就每种改造方案在什么情况下采用以及需要注意的事项进行探讨。     

A conceptual framework to define the spatial resolution requirements for agricultural monitoring using remote sensing

Satellite remote sensing is an invaluable tool to monitor agricultural resources. However, spatial patterns in agricultural landscapes vary significantly across the Earth resulting in different imagery requirements depending on what part of the globe is observed. Furthermore, there is an increasing diversity of Earth observation instruments providing imagery with various configurations of spatial, temporal, spectral and angular resolutions. In terms of spatial resolution, the choice of imagery should be conditioned by knowing the appropriate spatial frequency at which the landscape must be sampled with the imaging instrument in order to provide the required information from the targeted fields. This paper presents a conceptual framework to define quantitatively such requirements for both crop area estimation and crop growth monitoring based on user-defined constraints. The methodological development is based on simulating how agricultural landscapes, and more specifically the fields covered by a crop of interest, are seen by instruments with increasingly coarser resolving power. The results are provided not only in terms of acceptable pixel size but also of pixel purity which is the degree of homogeneity with respect to the target crop. This trade-off between size and purity can be adjusted according to the end-user's requirements. The method is implemented over various agricultural landscapes with contrasting spatial patterns, demonstrating its operational applicability. This diagnostic approach can be used: (i) to guide users in choosing the most appropriate imagery for their application, (ii) to evaluate the adequacy of existing remote sensing systems for monitoring agriculture in different regions of the world and (iii) to provide guidelines for space agencies to design future instruments dedicated to agriculture monitoring.     

Ecological assessment of Phragmites australis wetlands using multi-season SPOT-5 scenes

Ecologists and conservationists need accurate and replicable tools for monitoring wetland conditions in order to develop and implement adaptive management strategies efficiently. The Rhone Delta (Camargue) in southern France encloses 9200 ha of fragmented reed marshes actively managed for reed harvesting, waterfowl hunting or cattle grazing, and holding significant numbers of vulnerable European birds. We used multi-season SPOT-5 data in conjunction with ground survey to assess the predictive power of satellite imagery in modelling indicators of reed structure (height, diameter, density and cover of green/dry stems) relevant to ecosystem management and bird ecology. All indicators could be predicted accurately with a combination of bands (SWIR, NIR) and indices (SAVI, OSAVI, NDWI, DVI, DVW, MSI) issued from scenes of March, June, July, September or December and subtraction between these. All models were robust when validated with an independent set of satellite and field data. The high spatial resolution of SPOT-5 scenes (pixel of 10 × 10 m) permits the monitoring of detailed attributes characterizing the reed ecosystem across a large spatial extent, providing a scientifically-based, replicable tool for managers, stakeholders and decision-makers to follow wetland conditions in the short and long-term. Combined with models on the ecological requirements of vulnerable bird species, these tools can provide maps of potential species ranges at spatial extents that are relevant to ecosystem functioning and bird populations.     

基于广域网的PLC远程监控系统

PLC作为一种可靠的工业控制设备,在当前得到了广泛的应用。在相应的上位监控中,我们经常采用INTOUCH、IFIX、WINCC等一系列组态软件进行上位监控,其实利用C++Builder等开发工具的强大功能也可设计出完善的上位监控系统。虽然目前PLC的监控系统有很多,但很多都存在只能进行本地监控,无法远程查看的缺点,这影响了上一级负责人的许多决策。本文主要介绍一种基于广域网的PLC远程监控系统,阐述其工作原理,系统软硬件设计与实现,同时,本文还介绍了系统的调试与试验过程,并对其结果做了一些讨论,由此证明该系统实现了PLC的远程监控,达到了预期的要求。     

基于组态王6.5的离心泵微机在线监控系统

离心输油泵是石油化工产品输送的主要设备,微机在线监控系统主要用于炼油厂、乙烯厂、油库、输油管道等油气输送领域离心输油泵运行状态的监测、控制以及检修的预报等。本设计采用操作指导控制系统以及工厂的分布式层次化结构思想,以离心输油泵输入输出轴的振动参数为主要测试参数,并辅以离心输油泵油温、轴瓦温度监测,同时采用ADAM4000智能模块和RS—485网络,通过监控控制仪转换成RS—232信号给计算机,实现所需参数的显示与控制和计算机对离心输油泵的快速启停控制。系统软件基于Windows XP平台,运用北京亚控组态王6.5版开发而成,具有实用、实时、可靠与友好等特点。     

动态轨道衡远程管理系统设计

本文首先分析了原有轨道衡系统的缺陷与不足,接着提出了系统的改进方案:利用车号识别技术、视频监控技术、数据库及以太网技术等,对系统进行改进性设计。然后介绍了设计方案的整体结构以及中心信息系统和本地分系统的结构设计。本文最后还研究了在新方案设计中涉及的一些关键技术问题和实际工程应用中需要考虑的问题。     

基于远程冰蓄冷空调机房的自动控制设计

为了解决"电力告急,电量有余的状态",争取将用电低谷时期电力填补到高峰时的电力不足。而"移峰填谷"式的蓄冰空调逐渐成为中央空调发展的一个趋势。实现冰蓄冷机房的控制是用WebAccess组态软件完成设定、监控和故障报警等,对冰蓄冷机房进行各种水温、水压、流量和空气温度、湿度、风量、压力、风阀开度等参数进行监控,并且通过通讯实现预测空调负荷从而确定系统工作模式、改变控制策略,这样可提高冰蓄冷空调的运行水平。