Dirençün

Dirençün is a theoretical concept used in the study of complex systems to describe a system's inherent resistance to change under external perturbations. It is defined as a dimensionless index that combines structural robustness, adaptive capacity, and recovery speed. The term combines Turkish words direnç (resistance) and -ün as an abstract noun suffix.

Conceptually, dirençün aims to capture how well a network can maintain function when subjected to disruptions, such as node failures, external shocks, or cascading effects. A higher dirençün value indicates stronger resistance and faster return to baseline performance, while a lower value indicates vulnerability or slower recovery.

Measurement typically involves simulating perturbations and aggregating node-level responses across an ensemble of scenarios. Common approaches map network topology, load distributions, and dynamical rules to a resilience model, then compute the index from time-series or failure probabilities. The concept is used in fields ranging from electrical grids and communication networks to ecological and social systems.

Critics note that dirençün depends on the chosen perturbation ensemble and performance metrics, so cross-domain comparisons require careful standardization. Proponents argue that it provides a common language for discussing robustness beyond binary connected/disconnected judgments.

Records of the term appear in theoretical literature and in speculative assessments of future infrastructure resilience. Its practical application remains exploratory, with ongoing research on efficient estimation, interpretability, and policy implications.