What is IRDAM Journal?
If you look at this article, you can see that IRDAM is an acronym for Introduction, Results, Discussion, and Methods. IRDAM is a style/format of presenting results in publications. 

Quote from the article:


  The IRDAM format requires a substantial change in how the Results
  section is organized. Because the methods are listed at the end of the
  paper, or online, the reader is not exposed to details of the
  experimental protocols and methods before the results are presented.


See also,


  The format used by many high-impact basic research journals, such as
  Nature, Proceedings of the National Academy of Sciences, Journal of
  Clinical Investigation, and Journal of Cell Biology, is arranged so
  that the Results section immediately follows the Introduction. The
  Methods section is placed at the end, or it may even be published as a
  supplemental data file.