The meetings will be held on an ad hoc basis.

会议将按需要随时召开。

This is an ad hoc committee specially established to deal with a particular subject.

这是一家专门成立处理某一问题委员会。

The simulation results show that,compared with the protocols,EDGK is better in the group rekey success ratio and delay in mobile Ad hoc network environment.

拟试验表明,提出组密钥管理方案在移动自组网络中具有良好性能。