CERs (%) for each method when using RNN-based ASR models with JNAS as the target domain, where [X] indicates an ASR model trained with dataset X and Y + Z indicates a single ASR model trained with datasets Y and Z. [Y]+[Z], on the other hand, represents the integration of the outputs of ASR models trained with datasets Y and Z, respectively. The ROVER method is theoretically applicable to two models, but because majority voting fails and results in a tie, this study reports results only for the case of integration of three models