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数据库设计方案 大学老师 学生课程选课系统-Database design students and faculty Student Program Course Selection System

在电子技术中，频率是最基本的参数之一，又与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。在本次毕业设计中我们选择使用单片机来制作数字频率计，并在实际制作中采用了直接测频法。利用延时产生的时基门控信号来控制闸门，通过在单位时间内计数器记录下的脉冲个数计算出输入信号的频率，最终送入LCD中显示。这样制作出来的频率计不仅可以满足设计题目的参数要求，而且具有了单片机的稳定性和成熟性，且控制能力强，是一种低成本，高可靠的设计方案。-In electronic technology, the frequency is one of the most basic parameters, but also with a number of electrical parameters of the measurement program, the measurement results have a very close relationship between the frequency of measurement, therefore it is even more important. Measurement of the frequency of a number of means, electronic measurement of the frequency counter with high precision, easy to use, rapid measurement, and measurement is easy to realize the advantages of process automation is an important means of measuring the frequency of one. Graduates in this design we have chosen to make use of single-chip digital frequency meter, and used in the actual production of a direct

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一个百货管理系统的设计方案,可共大家参考-A department store management system design, can be a total of your reference

文中给出了在数字系统设计时常用的器件,和它们的参数希望对大家有所帮助-The paper gives the design of digital systems in the commonly used devices, and their parameters would like to help everyone

微芯力公司开发的WS430开发板的说明手册。Linux 程序开发基础篇......................................................3 第一章 硬件准备.....................................................................................................................3 第二章 运行Linux 操作系统下的例程.................................................................................4 2．1 启动Uboot并加载Linux .............................................................................................................4 2．2 通过ftp方式运行testled例程...............................................................................................11 2．3 加载卸载优盘实验...................................................................................................................14 2．4 优盘读写测试实验-micro-power company developed the WS430 Development Board of the manual. Linux development process for the project ...................... .......................... first three chapters hardware ready ...... .............................................. ..................

数据采集系统的好参考资料,高精度的传感器采集系统-Data acquisition system a good reference, high-precision sensor acquisition system

mx27开发板原理图，在原厂基础上作了很大修改，接近产品化，很有参考价值-mx27 sch

本文给出了一种避免网站危机的方法,即从软件工程的角度分析了电子商务网站建设过程中的常见问题,提出利用软件工程原理来规划整个电子商务网站。-In this paper, a Web site to avoid crisis, that is, from the perspective of software engineering analysis of the construction process of e-commerce website frequently asked questions, the use of software engineering principles to plan the entire e-commerce sites.