For many years the UUX SIG met once a year at the STC Summit. Over the years usability and user experience in technical communication have been defined in presentations at the Summit (formerly the annual conference). Legacy materials from the annual conference are online on the Wayback Machine.
The following usability and user experience papers are found in the proceedings of the STC Summit for 2015.
Applying Users’ Mental Models to Information Design 11, David J. Dick, Fellow
Let’s Get Real: Creating Tangible Products 39, Marli Mesibov
Clever Copy for Happy Users 115, Lauren T. G. Colton
Don’t Just Shrink It; Rethink It! 143, Marta Rauch, Associate Fellow, and Jennifer Stout