Membrane computing is a branch of natural computingwhich abstracts fromthe structure and the functioning of living cells. The computation models obtained in the field of membrane computing are usually called P systems. P systems have been used to solve computationally hard problems efficiently on the assumption that the execution of each rule is completed in exactly one time-unit (a global clock is assumed for timing and synchronizing the execution of rules). However, in biological reality, different biological processes take different times to be completed, which can also be influenced by many environmental factors. In this work, with this biological reality, we give a time-free solution to independent set problemusing P systems with active membranes, which solve the problem independent of the execution time of the involved rules.

翻译：闪膜计算是自然计算的一个分支,它摘自活细胞的结构和功能。在闪膜计算领域获得的计算模型通常称为P系统。 P系统被用来有效解决计算上的困难问题,假设每项规则的执行完全以一个时间单位完成(假设全球时钟用于时间和同步执行规则)。然而,在生物现实中,不同的生物过程需要不同时间才能完成,这也可能受到许多环境因素的影响。在这项工作中,根据这种生物现实,我们给使用P系统与活性膜独立设置的问题提供了一种无时间限制的解决办法,而P系统与活性膜系统是独立设置的,它解决的问题独立于有关规则的执行时间。