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In this note, we consider a stabilization problem of a chain of integrators with an unknown delay in the input. We propose an adaptive output feedback control scheme in which the delay-related low-gain parameter is tuned online by utilizing the integral value of the input norm-bound. Thus, a priori knowledge on the delay is not required for controller design. Index Terms-Adaptive output feedback, chain of integrators, time-delay systems, unknown delay. 2 ( 3 ; 1). Moreover, the bound of controldoi:10.1109/tac.2006.878742 fatcat:ensrwn2offhpffy6gfwh3f3yra