利用matlab GUI实现的串口编程例子，pwm整流器的建模仿真，可以得到很精确的幅值、频率、相位估计。
Use serial programming examples matlab GUI implementation, Modeling and simulation pwm rectifier You can get a very accurate amplitude, frequency, phase estimation. (2017-04-27, Objective-C, 9KB, 下载1次)
比较专业的并发编程介绍资料，详细介绍了 gcd的使用，以及block的知识也有一定的涉及，很经典！
Concurrent programming professional brochure details the the gcd use, as well as block knowledge involving very classic! (2012-11-23, Objective-C, 445KB, 下载36次)