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数字电路数字钟设计字数:4846,页数:21论文编号:JD345一、课程设计任务书1课程设计的基本任务 本课程设计的基本任务，是着重提高学生的动手能力及在字集成电路应用方面的实践技能，培养学生综合运用理论知识解决实际问题的能力。各组人员可分别通过设计图纸，上网查找资料，安装，连线，调试以及撰写报告这几个过程来锻炼同学们的逻辑思维能力及实际动手能力。让同学们能从实际操作中学习知识，思考存在的问题以及解决问题。2课程设计的基本要求（1）能画出电路原理图；（2）能正确的选用元器件以及对参数的正确计算；（3）能对电路仿真及调试； （4）在实验室进行连线调试；（5）能够独力的发现问题并解决问题。 3课程设计题目：数字钟4课程设计要求(1)设计的数字钟有以下功能实现23时59分59秒；整点报时；闹零设置。(2)在逻辑实验箱上完成安装及调试。(3)写出总结报告。目录一、课程设计任务书 1课程设计的基本任务 2课程设计的基本要求 3课程设计题目 4课程设计要求 1二、数字钟的电路方框图 2三、数字钟整体概述 2四、译码显示器 1七段半导体数码显示器 2液晶显示器 3七段显示译码器 5五、相关芯片功能及应用介绍 1 74LS90芯片功能及应用介绍 2 74LS08芯片功能及应用介绍 3 74LS21芯片介绍 9六、各模块设计 1分频电路的设计 2计时器的设计 3闹钟设置 4整点提示 15七、校时电路 16八、课设总结及心得体会 18九、课设所用元器件清单 19十、参考文献 19十一、附录 20整体图 20以上回答来自: -2/htm
B2B eMarketplaceAnnouncements and Shareholder WealthThe advent of the Internet as an instrument for business commerce has fundamentally altered the economy by ushering in increased efficiencies and more transparent Since businesses started conducting Internet transactions in 1995,the growth has been Forrester Research estimates that worldwide electronic commerce(e-commerce)revenues were about$650 billion in 2000 and projects they will grow to$8 trillion by The greatest impact is in the businessto-business(B2B)sector,where new supply chain models within electronic marketplaces (eMarketplaces)enable companies to significantly lower procurement costs and increase operating B2B eMarketplaces streamline the supply chain by making better use of more The time it takes to match buyers and sellers can be radically reduced,precautionary inventory levels can be lowered,and the range of potential suppliers and distribution outlets can be expanded as geographic boundaries Projections of online B2B revenues differ vastly,primarily because defining what counts and how to count it varies But despite these differences,forecasters agree that online B2B trade will grow B2B e-commerce is generally believed to account for about 80 to 90 percent of total e-commerce Forecasts typically project USline B2B revenues of about$2 trillion by 2003,up from roughly$336 billion in B2B e-commerce is expected to impact the USy Brookes and Wahhaj(2000)argue that the rapid growth of B2B e-commerce will have an economic impact over and above that of the normal process of innovation and productivity They suggest that as a result of B2B e-commerce,annual GDP growth in the large industrialized countries should rise an average 25 percent for the next ten years—with the level of GDP eventually 5 percent higher than it would otherwise have Brookes and Wahhaj conclude that the dominant long-run effect of B2B e-commerce will be on output and equity markets,rather than on inflation and bond 全文内容省略Investors should respond favorably to announcements of new B2B e-commerce initiatives,as long as they believe these moves will ultimately result in higher profits and increased productivity without fueling We examine the potential impact of B2B e-commerce initiatives on the New Economy paradigm using the efficient markets hypothesis(Fama et 1969),which implies stock prices reflect all available information about individual companies and about the economy as a Information is the key So in efficient capital markets,prices will immediately adjust to reflect any new Thus,B2B e-commerce announcements should immediately raise stock prices if investors believe a firm’s value will be increased by higher net future cash flows resulting from higher productivity,lower costs, or higher
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