基于END驱动IP层转发能力的提升方法

论文基于Tornado2.2开发环境提供的TCP/IP协议栈和END驱动模板,阐述了基于END驱动IP层转发能力提升的几个方法,并在MPC8260以太网平台中得到了验证。     

基于色彩管理的CRT色彩空间转换方法的研究

彩色显示器是用来传达颜色信息的重要工具,而色彩在不同设备和系统上往往会造成差异,因此对显示器建立一个色彩管理系统很有必要。采用阶调/矩阵方法建立了RGB- CIEXYZ色彩空间转换模型,分别运用多项式回归和指数回归算法对模型进行了曲线拟合,通过挑选不同的特征点完成了模型的色差计算与精度分析,取得了较好的实验结果,为建立显示器的色彩管理系统提供了依据。     

基于职业技能大赛视角的高职人才培养对策研究

文章阐述了职业技能大赛对学生技能水平、教师业务水平及校企合作等方面的促进作用,并从人才培养目标、教育教学改革、师资队伍建设、教材建设、实训基地建设等方面提出基于职业技能大赛的高职人才培养的策略。     

Cloud service provisioning in two types of DCN with awareness of delay and link failure probability

Cloud service based on data center network (DCN) has become an attractive choice for various applications. Traditionally, multiple DCs are distributed at different nodes across a given optical network, and users access DCs through predefined routes (this architecture is named as Multiple Independent DCN, MI-DCN). However, as there exist transmission delay and failure probability on each link, such a network may not be a good choice for the service providers from the perspective of service reliability and cost. Therefore, we propose the idea of regrouping all the racks and distributing each rack group on a special node, where there exists a gateway (this architecture is named as Integrated Distributed DCN, ID-DCN). As each group can provide service independently, by properly grouping and routing, the whole network can work more efficiently with lower cost and higher reliability. In this paper, we study the service provision in the above two types of DCN. With the given failure probability and transmission delay on each link, we aim to minimize the total service cost and design the access routes for the demands originated from each node. To integrate the system cost, we introduce two cost scaling factors for delay and failure probability, which can be flexibly adjusted to control their relative importance (i.e., the weights). Based on mathematical approximation, a novel method is proposed to compute the failure probabilities of individual service paths. This translates our objective function into a linear expression. Then, we formulate two integer linear programs (ILP) to compare the solutions of the two scenarios. Via extensive numerical experiments, the performance of the two schemes is properly verified.     

数据库表备注文件的研究

通过对数据库表中备注文件的分析，介绍了备注文件的存储方式、备注块大小的定义及合理应用，提出了备注字段内容的输入输出方法。运用这些技术能有效节省数据库表备注字段的存储空间，能有效提高备注字段的处理速度，对大型数据库的开发是非常有实用价值的。     

网络电话的发展对传统运营商的冲击

美国《商业周刊》一篇题为《电信混乱》报道,因特网正迅速改造电信行业。现在每个月有数十万美国人转向沃尼奇等新兴公司的以网络技术为基础的电话服务。1200亿美元的传统电话业务的收入正每年减少好几个百分点,而以网络技术为基础的电信服务收入2007年将达到67亿美元,2003年这个数字是2.81亿美元。意识到沃尼奇等新兴网络公司的威胁,美国电信巨头AT&T、时代华纳、斯普林特通信、MCI以及不少小贝尔公司纷纷宣布开展此项业务。面对网络电话迅猛发展的汹涌以及新的竞争态势,我国传统运营商该如何应对?     

DC and microwave noise transient behavior of InP/InGaAs doubleheterojunction bipolar transistor (DHBT) with polyimide passivation

DC and microwave noise transient behavior of InP/InGaAs double heterojunction bipolar transistor (DHBT) with polyimide passivation is reported in this paper for the first time. The base transient current is believed to be due to the change of surface potential near the base-emitter junction perimeter at the polyimide/emitter interface resulting from a decrease in the amount of trapped electrons in the polyimide. We also find that the surface potential on the sidewall of collector-emitter affected by the charge trapping and detrapping in polyimide may induce a parasitic polyimide field effect transistor along the surface of the base-collector junction which results in an excess collector transient current. These base and collector current transients result in associated transient of broadband shot noise. The time dependence of microwave noise figures due to the excess transients is also investigated. The better understanding of the mechanisms of the noise transient behavior of the InP HBT device is very useful to improve the device and circuit reliability     

I^2C总线接口技术在视频处理芯片中的应用

文章使用传输I^2C总线技术实现视频处理芯片与PC机的数据通信。采用软、硬件协同工作的方法完成芯片的参数初始化,并将其应用于对电路内部节点的跟踪和测试,极大地增加了视频处理的灵活性。将I^2C接口电路内嵌于视频处理芯片中,采用CMOS0．6μm单层多晶硅双层金属布线工艺流片,电路测试功能正常。     

无源光网络的工程特点与实用设计:PON均值查图法

介绍了无源光网络的工程设计特点 ,分析了ITU TG 982推荐采用的高斯统计法的应用限制 ,并介绍了一种新的无源光网络设计预算的简便方法———PON均值查图法 ,该方法的特点和A、B图及查图使用方法。最后试用PON均值查图法 ,对一个包含有 1∶3非均匀分光器的 4级连 1/ 8无源分配网络进行了工程设计预算。     

基于FlexRay总线的火炮随动节点设计

传统的总线技术传输速率低、可靠性差和布线结构复杂,不适用于复杂火炮系统.因此,选择通信速率快、可靠性高和抗干扰能力强的FlexRay总线技术构建火炮通信节点具有重要意义.基于FlexRay的火炮随动系统通信接口卡以MC9S12XF512单片机为处理核心,通过节点软硬件设计,实现了数据的采集和传递.实验证明,FlexRay技术可增强控制系统稳定性,提高系统实时反应能力.