Rotor fault condition monitoring techniques for squirrel-cage induction machine—A review

Nowadays, manufacturing companies are making great efforts to implement an effective machinery maintenance program, which provides incipient fault detection. The machine problem and its irregularity can be detected at an early stage by employing a suitable condition monitoring accompanied with powerful signal processing technique. Among various defects occurred in machines, rotor faults are of significant importance as they cause secondary failures that lead to a serious motor malfunction. Diagnosis of rotor failures has long been an important but complicated task in the area of motor faults detection. This paper intends to review and summarize the recent researches and developments performed in condition monitoring of the induction machine with the purpose of rotor faults detection. The aim of this article is to provide a broad outlook on rotor fault monitoring techniques for the researchers and engineers.     

移动铁通地市IP城域网互联解决方案

本文从分析湖南移动和湖南铁通现有互联方式存在的问题入手，结合双方网络结构现状，制定了湖南移动与湖南铁通地市IP城域网互联的原则：接入网就近接入的原则、满足上级单位管理要求的原则、满足安全与IP地址管理的原则、业务归属与上层流量疏导一致的原则。在此原则上，提出了通过QinQ技术，分别在接入层和汇聚层实现两层VLAN封装，以进行业务的区分和隔离。进而提出了铁通接入网在汇聚层分流上行，接入移动SR／BRAS；移动接入网在业务控制层分流上行，接入铁通地市核心路由器的解决方案。该方案的实施，扩大了湖南铁通有线宽带的覆盖范围，增强了湖南移动全业务竞争的能力。     

428XL网络无线桥的应用

428XL网络无线桥是一个75 Mb/s的无线数据链,可用来代替428XL交叉线。使用428XL网络无线桥可增强排列布设的灵活性,地震队借此能避开所有的地面障碍物来进行高效的野外作业。本文比较详细地介绍了428XL网络无线桥的组成,连接、参数设置、更改IP地址的方法,并详细阐述了其安装、使用过程中的注意事项。     

SME tailor-designed patent portfolio analysis

The management of patents is acknowledged to be closely correlated to a company’s profits. Thus, evaluation of patent portfolios is an essential task for companies producing or depending on technology-related products. While global players and consultants already have considerable experience in this field, no tool has so far been available that meets SME requirements. The Innovation and Patent-Centre at the Chamber of Commerce in Hamburg, a German think tank for patent management, has now developed a tool specially suited for SMEs. The article describes the methodology of the tool and compares it to other state-of-the-art tools. The tool gives an easy-to-understand overview for personnel with different professional backgrounds and facilitates strategic cross-functional discussions. Field tests carried out with SMEs in different industry sectors and with varying patent portfolio sizes and structures have shown good results.     

广电网络中远程教育的实现方式

本文结合福建广电网络，综合目前网络上的各系统集成平台。通过四种不同方式从系统架构及技术应用上阐述远程教育技术在广电网络上实现的方式，并分别针对四种实现方式进行总结与分析。     

IP网流量工程的一种权值设置方法

提出一种新的基于传统路由协议的流量控制方法。该方法首先在不限制总流量条件下求解最小化最大连接利用率。然后在固定最大连接利用率条件下最小化总流量。由此求得最优流量分配方案并从其对偶问题中求出各连接的权值配置。实验结果显示，文中算法较现有算法明显降低最大连接利用率，并且增加了稳定性。     

浮动许可证加密系统的研制

本文以作者开发的浮动许可证加密系统为例，详细讨论了适合于Ｗｉｎｄｏｗｓ等 网络加密技术，包括计算机ＩＤ号的构造，通过ＴＣＰ／ＩＰ网络对加密系统各个模块实现许可证控制等。     

iPTT: peer‐to‐peer push‐to‐talk for VoIP

This paper proposes iPTT, a peer‐to‐peer (P2P) Push‐to‐Talk (PTT) service for Voice over IP (VoIP). In iPTT, a distributed and mobile‐operator independent network architecture is presented to accelerate the deployment of the PTT service. Based on the serverless architecture, we develop two mechanisms, that is, flooding‐based floor control mechanism (FFC) and tree‐based floor control mechanism (TFC), for real‐time talk‐burst determination. The determination algorithms and the corresponding message flows for these two mechanisms are designed to show the feasibility of FFC and TFC. The performance of FFC and TFC is investigated through our analytical and simulation models in terms of the determination latency and the number of floor‐control message exchanges. Copyright © 2008 John Wiley & Sons, Ltd.     

1553B总线通信终端知识产权核的设计

为满足航天飞行器地面仿真设备使用的需求,设计了一种基于可编程逻辑门阵列(FPGA)的1553B总线通信终端知识产权(IP)核。在保证总线系统可靠性的前提下,采用自顶向下的设计方法与“双进程”编码方式,利用超高速硬件描述语言(VHDL)生成目标代码,使用ModelSim软件进行仿真,最后在实际设备中验证并应用。该IP核可配置在总线控制器、远程终端或总线监控器3种不同的工作模式下运行,易于集成入片上系统(SoC),对进一步应用1553B总线提供了更多的选择。