宽带无线接入网中的RS编译码硬件解决方案

提出了欧氏算法和IDFT相结合的RS码流式解码方案,并在FPGA芯片上予以实现。计算机仿真和实测表明,该方案在GF(28)的符号速率可达50MHz以上,最大延时为640ns,满足了高速宽带无线接入网中抗干扰编译码的需求。     

试论品牌竞争时代与关系资源

品牌竞争时代实质是对关系资源竞争的时代。关系资源将在企业的运作中发挥越来越多的作用。企业的关系营销和企业工作作为发挥关系资源的重要手段，其重要性也愈加凸现重要。     

Zigbee在U型巷道立体仓库中的应用

以Zigbee无线通讯技术为基础,介绍了无线通讯在立体仓库系统中的应用,并比较了几种无线通讯方式的优劣,提出了各自的应用环境,结合现有仓库的布局,提出了无线通讯模块的布局及网络控制流程。     

基于VHDL语言的GF(28)上快速乘法器设计

基于有限域上多项式乘法理论，采用高层次设计方法，采用CPLD实现了GF(2^8)上8位快速乘法器，利用XILINX公司的Foundation Series3．1i集成设计环境完成了快速乘法器的VHDL源代码输入、功能仿真、布局与布线、时序仿真，并用XC9572PC84可编程逻辑芯片验证了该电路设计。该乘法器可以应用于RS(255，223)码编／译码器。     

RS-232在单片机系统中的应用研究

系统介绍RS-232C串口技术，详细分析MCS-51单片机与RS-232C串行接口的设计电路和该接口的抗干扰技术的方法。     

The ideology of class and tourism confronting the discourse of advertising

Starting from Baudrillard's analysis of the ideological character inherent in all consumption, touristic consumption, for many reasons ,has a special place in this social semantic. Here, advertising plays an important if not essential role because tourism is a product consumed outside of normal time and daily social space. Therefore the social semantic asserts itselfless through the product itself than through its representation: the discourse of advertising. But advertising discourse is plural, each form having its own ideology, competing with others. Behind the commercial competition lies a competition of social classes, but with a new typology, no longer based on the capital/favor relationship. Four ideological models are analyzed and illustrated with their advertising messages: the traditional model, the clerical/executive model, the youth model, and the “intellectual class” model.     

Delphi环境下实现与AVR单片机的串行通信

以材料试验机数据采集及控制系统为实例,介绍了PC机与AVR单片机串行通信的硬件实现方法。详细说明了在Delphi环境下,TComm串行通信组件的使用和软件编程方法。阐述了在AVR Studio+AVR GCC编程环境下,ATmega16单片机串口通信的软件编程。实际应用表明,该方案稳定、可靠、易于实现,具有很好的工程实用价值。     

山地丘陵区土壤侵蚀动态监测技术

山地丘陵地区土壤侵蚀严重,需要采取有效的措施进行土壤监测;采用“3S”集成技术,建立山地丘陵区土壤侵蚀动态监测系统;利用RS和GPS技术进行数据采集与更新,以GIS为组织手段对空间数据进行动态的分析和处理,对土壤侵蚀严重及危险区进行预警;以重庆市土壤侵蚀动态监测为例,详细介绍了土壤侵蚀动态监测系统的属性与功能。     

Dynamics of foreign exchange implied volatility and implied correlation surfaces

The prices of currency options expressed in terms of their implied volatilities and the implied correlations between foreign exchange rates at a given point in time depend on option delta and time to maturity. Implied volatilities and implied correlations likewise may thus be represented as a surface. It is well known that these surfaces exhibit both skew/smile features and term structure effects and their shapes fluctuate substantially over time. Using implied volatilities on three currency pairs as well as historical implied correlation values between them, we study the nature of these fluctuations by applying a Karhunen-Loève decomposition that is a generalization of a principal component analysis. We demonstrate that the largest share in the dynamics of these surfaces' fluctuations may be explained by exactly the same three factors, providing evidence of strong interdependences between implied correlation and implied volatility of global currency pairs.     

发动机测试数据采集与处理系统的设计及实现

文章探索的是有关发动机性能测试数据方面的技术.对发动机需要测量的数据有转速、扭矩、功率、耗油率、耗油量、机油压力、机油温度、冷却水温等参数.发动机测试数据采集与处理系统由上位机和下位机组成.下位机主要采用AT89C52单片机,用汇编语言编写相应的程序,用模-数转换器ADC0809把模拟量转换为数字量;而上位机采用PC机,程序语言用VB,存储数据采用Access数据库,最终实现试验数据的显示、存贮与打印等功能.