毕业论文救急

E-commerce security technology researchAbstract E-commerce in today's global economy occupies an increasingly important position. This article introduces the basic theory of e-commerce, e-commerce development of China's status quo, focus on e-commerce in the security and the issue of credit and the settlement of the corresponding strategy for the security of e-commerce applications have a certain value. Keyword: e-commerce, security technology, firewall只做参考!

好多写这个作品的人物性格分析的

Topic: wireless remote controlDesign requirements:(1) the frequency of the emission control circuit 28MHz spare frequency).(2) launch distance for about 30, mainly in the remote control household appliances within the family.(3) transmitters in the power supply voltage required 9V below.(4) remote receiver is required to accurately determine the 28MHz receives signals, and the control signal demodulation control switch.(5) the power required to exploit the receiver remote communication power supply, the design of 220V voltage source for a simple its power.(6) as the remote circuit is simple and 2: design of simple digital voltmeterA simple digital voltmeter and requirement: can measure the 8 0 ~ 5V input voltage values, and in four LED digital display or turn on the pipe road choose to display. Minimum resolution for measuring the error, V for VSecond, content:(1) the overall design scheme(2) control system hardware circuit design (display USES four digital tube),(3) software flowchart design, assembly programming(4) electrical schematic diagram of the drawing

第一个是老式的无线电遥控，超再生电路就是由此30MHz短波发端的，电路简单，就用现在的遥控芯片，改个射频就可以了。第二个，要单片机编程，在这里写出太麻烦了吧。