DNS-BC: Fast, Reliable and Secure Domain Name System Caching System Based on a Consortium Blockchain.

The Domain Name System (DNS) is a fundamental component of the internet, responsible for resolving domain names into IP addresses. DNS servers are typically categorized into four types: recursive resolvers, root name servers, Top-Level Domain (TLD) name servers, and authoritative name servers. The latter three types of servers store actual records, while recursive resolvers do not store any real data and are only responsible for querying the other three types of servers and responding to clients.

Event-triggered state estimator design for unknown input and noise-correlated random system.

In this study, an event-driven state estimator is designed for stochastic systems that contain unknown inputs and processes as well as correlated measurement noise. First, the event-triggered state estimator's gain is deduced by using the random stability theory and Lyapunov's function. Then, based on the results, the corresponding state estimation errors are calculated in mean square convergence.