企业信息化建设中的问题及对策

我国企业在信息化建设过程中取得了一些成果 ,也出现了不少问题 ,本文主要针对这种现状 ,指出了企业存在的一些问题 ,并就信息系统开发、维护和集成 ,提出了一些建议。     

VPDN企业端解决方案

从虚拟专用拨号网（VPDN）结构的基本原理、隧道协议、认证方式等方面概述了中国联通开展VPDN业务的实施步骤和解决VPDN企业端的5种模式，并介绍了中国石油天然气管道电信公司实现VPDN企业端的具体方案。     

基于现场总线技术的电站仿真培训系统

介绍了某型电站仿真培训系统的研制方案，提出了一种采用现场总线技术进行仿真机开发的方法。说明了现场总线与台盘控制对象的接口原理及结构特点，不仅较好地解决了台盘与仿真模型间的通讯难题，而且使系统结构简单，运行可靠。还对仿真模型的建模原理以及声响模拟的实现方法进行了说明。     

面向智能电网的云数据处理系统评价方法

智能电网数据处理系统需要存储从巨量设备端点周期性采集到的海量数据,处理高度并发的读写请求,并要求系统具有良好的可扩展性.新兴的云数据服务系统为我们提供了很好的选择.但是现在云数据服务系统种类繁多,各方面的性能存在差异,如何选择合适的云数据服务系统成为关键问题.基于智能用电场景,提出了一种对云数据服务系统的性能评价和分析方法,并利用该方法评测HBase、Voldemort和Cassandra三者的性能.     

封装技术的发展-电力电子器件中的新尺寸

赛米控将银烧结工艺代替了芯片和DBC之间的焊接绑定线,这项新技术的使用将使得生产出体积比最先进系统切实减小30%的逆变器成为可能。这项技术的优势将在具有最佳机械一体化的集成、紧凑型系统中得到最好的展现。     

3-D electrothermal simulation of active cycling on smart power MOSFETs during short-circuit and UIS conditions

Active cycling of power devices operated in harsh conditions causes high power dissipation, resulting in critical electrothermal and thermo-mechanical effects that may lead to catastrophic failures. This paper analyzes the ageing-induced degradation of the chip metallization of a power MOSFET and its impact on the device robustness during short-circuit and unclamped inductive switching tests. A 3-D electrothermal simulator relying on a full circuit representation of the whole device is used to predict the influence of various ageing levels. It is found that ageing can jeopardize the robustness of the transistor when subject to short-circuit conditions due to the exacerbated de-biasing effect on the gate-source voltage distribution; conversely, this mechanism does not arise under unclamped inductive switching conditions. This allows explaining the difference in time-to-failure experimentally observed for the transistors subject to these tests and dissipating the same energy.     

A beam steering antenna for X-band high power applications

There is a considerable interest in the antennas which have high power handling capacity with beam steering functionality. The design of narrow side waveguide slot-array antenna for high power applications is introduced in this paper. An approach to achieve a uniform radiation slot waveguide antenna is presented. The large scale array antenna can be composed of such antenna cells. Moreover, it is possible to realize beam steering in the azimuth direction by adjusting the broad wall dimension of the waveguide. Besides, this slot waveguide antenna is expected to have high power handling capacity in vacuum environment, because there is no dielectric or electric field enhancement inside the antenna.     

Analysis of Power Consumption on Laser Solder Joints of Electric Connector

Laser soldering process was introduced in Universal serial bus （USB） 2.0 electric connector to improve the mechanical and electrical bonding reliabil- ity. While, the effects of laser soldering technology on electric connector solder joints need to be estimated com- pletely, especially on power consumption. The combined method based on numerical simulation and the Accelerated temperature experiment （ATE） was developed to analyze the power consumption of USB 2.0 electric connector in this paper. The ATE contains thermal cycle and thermal shock tests, and the four-electrode method is used to ob- tain the conductivity of solder joints. Numerical modeling and analysis was used to quantify the power consumption and optimize the geometry of solder joints, because the electric experimental measurements of power consumption during ATE are time-costing and often intractable. Accurate knowledge of the power consumption is a prerequisite for the reliability of the electric connector.     

Ultra-low power m-sequence code generator for body sensor node applications

In this paper, a design of low power m-sequence code generator is proposed. The efficiency of producing the code sequence within the region of sub-threshold voltage is investigated using 90 nm technology and verified using the auto-correlation and eye diagram characterizations. A further method of power saving in addition to voltage reduction is carried out by scaling the technology node from 90 to 65 nm. A comparison of power consumption and maximum attainable frequency between both technologies is performed. The ratio of power saving while using 65 nm technology is ranging from 45% to 55% for the three different code lengths investigated.     

电子商务时代企业ERP系统的建设

本文通过深入的研究证明在电子商务的时代切实可行地加强企业ERP系统建设的重要性以及可行性,也通过在企业ERP建设的同时发现电子商务时代企业ERP系统建设的问题提出探讨,并提出相关意见及建议。