Debian GNU/Linux软件网络的演变:与基因调控网络的类比和差异
Evolution in the Debian GNU/Linux software network: analogies and differences with gene regulatory networks
摘要:
生物网络表现出复杂的结构,被认为是其功能的关键。特别是在细胞信息处理中起关键作用的基因调控网络,显示出非平凡的结构特征,如无标度分布、高模块性和连接基因之间的低平均距离。这种网络是复杂的进化和适应过程的结果,很难凭经验追踪。另一方面,存在关于开放软件网络的发展(或进化)阶段的详细信息,这些信息来自于跨版本的自组织增长。在这里,我们研究Debian GNU/Linux软件网络的演变,重点关注关键结构和统计特征随时间的变化。我们的研究结果表明,进化导致了一个网络结构,其中的出度分布是无标度的,而入度分布是一个拉伸指数。此外,虽然模块化、信息流动的方向性和要素之间的平均距离增加,但脆弱性随着时间的推移而减少。这些特征与目前基因调控网络所显示的特征非常相似,这表明信息处理网络的结构设计存在共同的适应性途径。在其他层次方面的差异指向系统特定的解决方案,类似的演变的挑战。
英文摘要:
Biological networks exhibit intricate architectures deemed to be crucial for their functionality. In particular, gene regulatory networks, which play a key role in information processing in the cell, display non-trivial architectural features such as scale-free degree distributions, high modularity, and low average distance between connected genes. Such networks result from complex evolutionary and adaptive processes difficult to track down empirically. On the other hand, there exists detailed information on the developmental (or evolutionary) stages of open-software networks that result from self-organized growth across versions. Here, we study the evolution of the Debian GNU/Linux software network, focusing on the changes of key structural and statistical features over time. Our results show that evolution has led to a network structure in which the out-degree distribution is scale-free and the in-degree distribution is a stretched exponential. In addition, while modularity, directionality of information flow, and average distance between elements grew, vulnerability decreased over time. These features resemble closely those currently shown by gene regulatory networks, suggesting the existence of common adaptive pathways for the architectural design of information-processing networks. Differences in other hierarchical aspects point to system-specific solutions to similar evolutionary challenges.
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