邮件系统是Linux网络应用的重要组成，一个完整的邮件系统包括三个部分：底层操作系统（Linux Operation），邮件传送代理（Mail Transport Agent，MTA），邮件分发代理（Mail Delivery Agent，MDA），邮件用户代理（Mail User Agent，MUA）。 Postfix是一个非常优秀的MTA，她素以高效、安全的特点而著称。Postfix是作者在UNIX上所见过的MTA中在反垃圾邮件（Anti- Spam或Anti-UCE）方面做得最好的一个，甚至有很多公司在Postfix代码的基础上进行二次开发而推出反垃圾邮件网关产品。MTA的反垃圾邮件功能，实际上就是在MTA处理过程中对会话进行过滤。这个过滤不但过滤了发往自身的垃圾邮件，而且还防止了自身被恶意利用发送垃圾邮件。Postfix 实现了目前所有主要的MTA过滤技术。postfix是Wietse Venema在IBM的GPL协议之下开发的MTA（邮件传输代理）软件。和Sendmail相比Postfix更快、更容易管理、更灵活、更安全。
上传时间： 2015-11-25
上传用户：dapangxie
这些天新壳大爆发啊，我也来凑个热闹。 又是一个自娱自乐的产物，和netsowell发布过源码的那个不一样，这个壳90％的代码是用delphi写成的。 仅在win2k+sp4上测试过，不支持9x系统。因为用了一个可能不安全的隐藏oep的方法，xp系统上有可能会出问题。 没花，没anti代码，适合初学者了解壳。 现在只能压缩exe文件。 压缩包里含源码，算是为这里的delphi初学者的小礼物。
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上传时间： 2013-12-28
上传用户：541657925
pav 反病毒源码 /*************************************************************************** * * * File: ANTI-VIRUS * * Function: This program demostrating file anti-virus managment * * * * Author: Long Yun Liang * * First edit: 1995,3,10 * * Last edit: 1996,11,5 All Rights Reserved * * * * * ***************************************************************************/
上传时间： 2014-01-14
上传用户：hullow
If you have programming experience and a familiarity with C--the dominant language in embedded systems--Programming Embedded Systems, Second Edition is exactly what you need to get started with embedded software. This software is ubiquitous, hidden away inside our watches, DVD players, mobile phones, anti-lock brakes, and even a few toasters. The military uses embedded software to guide missiles, detect enemy aircraft, and pilot UAVs. Communication satellites, deep-space probes, and many medical instruments would have been nearly impossible to create without embedded software.
标签： familiarity programming experience dominant
上传时间： 2013-12-11
上传用户：362279997
可编程并行接口８２５５Ａ完成的交通灯实验 用８２５５Ａ的Ｂ端口和Ｃ端口控制１２个ＬＥＤ的亮和灭（输出为０则亮，输出为１则灭），模拟十字路口的交通灯。 -programmable parallel interface 8255A completed, the traffic lights experimental 8255A port B and C - I control 12 LED bright and methomyl (output of 0-liang, the output of an anti), the simulation of traffic lights at a crossroads.
上传时间： 2016-08-13
上传用户：来茴
The TW2835 has four high quality NTSC/PAL video decoders, dual color display controllers and dual video encoders. The TW2835 contains four built-in analog anti-aliasing filters, four 10bit Analog-to-Digital converters, and proprietary digital gain/clamp controller, high quality Y/C separator to reduce cross-noise and high performance free scaler. Four built-in motion,
标签： dual controllers decoders display
上传时间： 2017-03-20
上传用户：来茴
这是I2c网关Id独立烧写程序， 烧写的ID必须要求是：“0~9”、“a~z”、“A~Z”的16为字符才能烧写成功。 其中当是输入的小写字母时，自动转换为大些烧入。 如： 1） # ./burnID 0123456789abcdef 烧入的是：0123456789ABCDEF 2] # ./burnID 0123456789@ cdef 烧入不成功，因为有其他字符 3） # ./burnID 0123456789abcdefDfs 烧入也不成，因为超过16个字符 built-in analog anti-aliasing filters, four 10bit Analog-to-Digital converters, and proprietary digital gain/clamp controller, high quality Y/C separator to reduce cross-noise and high performance free scaler. Four built-in motion,
上传时间： 2017-03-20
上传用户：playboys0
Do you as a programmer for their own software to be illegal to crack the use of distress, this is a hot issue programmers abroad, I believe you made reference to this source will be a number of anti-cracking tools.
标签： programmer distress software illegal
上传时间： 2014-12-21
上传用户：李梦晗
Spread-spectrum techniques are methods by which electromagnetic energy generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure communications, increasing resistance to natural interference and jamming, and to prevent detec
标签： Spread-spectrum electromagnetic techniques particular
上传时间： 2017-06-06
上传用户：royzhangsz
Title : Implementation of quadrature modulation and demodulation Design Object : By implementing quadrature modulation and demodulation of analog signals in digital signal processing, students will have better understanding of sampling and frequency analysis of discrete-time signals. Design Content : Make a MATLAB function which performs quadrature modulation and demodulation for a input signal with anti-aliasing filtering.
标签： Implementation demodulation implementing modulation
上传时间： 2013-12-09
上传用户：蠢蠢66
