Szukana fraza: [Abstract = "In this paper, a feedback\-aided PD\-type iterative learning control \(ILC\) design is proposed for the time\-varying systems with non\-uniform trial lengths to achieve asymptotic tracking of the desired trajectory. To alleviate the problem of missing information caused by non\-uniform trial lengths, signals from most recently available iterations can be used for system learning by introducing an indicato function to construct recursively generated update error and input sequences."]