16线POTS ONT硬件设计

光网络设备(Optical Network Terminal,ONT)是XPON网络接入方案中的产品,是一种应用在用户端的光网络终端,有GPON和EPON。介绍以PON ONU SOC为主控芯片的16线POTS ONT的硬件设计及遇到的问题以及如何解决这些问题。此设计是一款基于GPON(ITU-T G. 984)标准并支持以太网和语音接口的ONT,适用于北美市场,满足NEBS1标准。本设计的特点是有16线的语音用户接口和1个GE的接口,上联是GPON,支持Dying Gasp且功耗低。     

GE RX3i系统设计与虚拟对象应用 第6讲 GERX3i在模块化加工站的设计

模块化加工系统是将定制产品的制造问题通过产品重组和过程重组转化为或部分转化为批量制造问题,即提供给用户的是全新的、定制的个性化产品,而实际产品则主要由标准的模块组成。本文介绍了GE RX3i在模块化加工站中的设计。     

长江三角洲地区城乡收入差距测度

基于GE指数相关理论,测度了长江三角洲的城乡收入差距,测算和分析各种收入来源对城乡之间收入差距的影响度,得出了经营性收入对城乡收入差距的贡献率最大、工资性收入其次、财产性收入和转移性收入贡献率最小等结论。     

露天矿中基于谷歌地球的车辆三维助驾系统

针对露天矿恶劣驾驶环境、矿车司机盲区等因素引发的事故,运用全球定位系统(GPS)、无线远程数据广播模块和谷歌地球(GE)三维图形控制引擎技术,开发露天矿车辆安全三维助驾系统,分别为露天矿司机和远程调度人员提供三维参考信息与实时车辆监测信息。该系统通过定制露天矿三维数字地图,监测车辆实时位置的三维车辆模型或标记点,显示安全驾驶引导路线,可以提高露天矿车辆驾驶的安全性。     

Smallworld平台上GE配电网设备的数据建模

介绍了基于Smallworld的GE园区设备资产空间管理系统配电网电力设备的GIS设备对象的建模方法,结合面向对象思想与可视化建模工具(Case Tool),描述了GE园区设备资产空间管理系统配电网电力设备GIS数据建模的具体过程,实现了网络拓扑追踪.     

选煤自动控制系统

介绍了太原煤炭气化集团有限公司东河选煤厂自动控制系统的组成、配置，实现了逆煤流启车。顺煤流停车及发生事故时急停的自动控制功能。该控制系统结构简单清晰，功能严谨完善，控制效果良好。     

Entropy maximisation and open queueing networks with priorities and blocking

A review is carried out on the characterisation and algorithmic implementation of an extended product-form approximation, based on the principle of maximum entropy (ME), for a wide class of arbitrary finite capacity open queueing network models (QNMs) with service and space priorities. A single server finite capacity GE/GE/1/N queue with R (R>1) distinct priority classes, compound Poisson arrival processes (CPPs) with geometrically distributed batches and generalised exponential (GE) service times is analysed via entropy maximisation, subject to suitable GE-type queueing theoretic constraints, under preemptive resume (PR) and head-of-line (HOL) scheduling rules combined with complete buffer sharing (CBS) and partial buffer sharing (PBS) management schemes stipulating a sequence of buffer thresholds {N=(N₁,…,N_R),0<N_i≤N_i−1,i=2,…,R}. The GE/GE/1/N queue is utilised, in conjunction with GE-type first two moment flow approximation formulae, as a cost-effective building block towards the establishment of a generic ME queue-by-queue decomposition algorithm for arbitrary open QNMs with space and service priorities under repetitive service blocking with random destination (RS-RD). Typical numerical results are included to illustrate the credibility of the ME algorithm against simulation for various network topologies and define experimentally pessimistic GE-type performance bounds. Remarks on the extensions of the ME algorithm to other types of blocking mechanisms, such as repetitive service blocking with fixed destination (RS-FD) and blocking-after-service (BAS), are included.     

面向TD-LTE的PTN接入层演进策略研究

随着TD-LTE网络建设规模的加大,并且引入双频组网和载波聚合的技术,现有PTN接入层网络结构无法满足TD-LTE基站的回传需求.通过对PTN接入层网络现状以及TD-LTE业务发展需求的分析,对不同接入场景下的PTN接入层网络提出相应的方案,为LTE传送网接入层演进策略提供参考.     

Comparing alternative cellulosic biomass biorefining systems: Centralized versus distributed processing systems

This study explores how two different cellulosic ethanol production system configurations (distributed versus centralized processing) affect some aspects of the economic and environmental performance of cellulosic ethanol, measured as minimum ethanol selling price (MESP) and various environmental impact categories. The eco-efficiency indicator, which simultaneously accounts for economic and environmental features, is also calculated. The centralized configuration offers better economic performance for small-scale biorefineries, while the distributed configuration is economically superior for large-scale biorefineries. The MESP of the centralized configuration declines with increased biorefinery size up to a point and then rises due to the cost of trucking biomass to the biorefinery. In contrast, the MESP in the distributed configuration continuously declines with increasing biorefinery size due to the lower costs of railroad transportation and the greater economies of scale achieved at much larger biorefinery sizes, including biorefineries that reach the size of an average oil refinery—about 30,000 tons per day of feedstock. The centralized system yields lower environmental impacts for most impact categories than does the distributed system regardless of the biorefinery size. Eco-efficiency analysis shows that the centralized configuration is more sustainable for small-scale biorefineries, while the distributed configuration with railroad transport is more sustainable for large-scale biorefineries. Compared with gasoline from petroleum, cellulosic ethanol fuel offers sustainability advantages for the following environmental impact categories: fossil energy consumption, global warming, human health impacts by particulate matter, ozone layer depletion, ecotoxicity, human health cancer, and human health non-cancer, depending somewhat on the biorefinery sizes and the system configurations.     

基于GE Fanuc PLC的Accu Roll轧管机组基础自动化系统的设计与实现

介绍了GE Fanuc PLC作为Accu Roll轧管机组的基础控制单元的整套自动化系统的设计及实现情况。简述了该机组主要设备的工作流程、自动化系统的控制范围与功能要求;详细描述了采用GE Fanuc方案的系统硬件、软件配置,程序架构和相应控制功能与特点。