The publisher of the International Journal of Intelligent Unmanned Systems is issuing an expression of concern for the following article by K. Upendra Raju and N. Amutha Prabha, Dual images in reversible data hiding with adaptive color space variation using wavelet transforms, International Journal of Intelligent Unmanned Systems, 31 January 2023; 11 (1): 96-108. https://doi.org/10.1108/IJIUS-08-2021-0095. An investigation by the publisher found a number of articles with concerns that relate to compromised editorial handling and reviewing. As a result of these concerns and as trust in the content is central to the integrity of the publication process, the Editor-in-Chief and publisher have taken the decision to publish an expression of concern. Further information will be provided by the International Journal of Intelligent Unmanned Systems as it becomes available. The publisher of the journal sincerely apologizes to the readers. Despite numerous attempts to contact the authors, the journal has received no response; the response of the authors would be gratefully received.
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