access_block

代码说明：

  在一定的资源数下，服从泊松分布到达和指数分布离开的用户，仿真在用户数不断增加时网络阻塞率。自己编写。(Under certain number of resources, and the Poisson arrival of the user leaves the exponential distribution, the blocking probability in the simulation the number of users increases. Write your own.)