well HCI could if you were looking at social aspects….but I suspect you might want to look to places like the interaction design centre in UL and there is a HCI network of academics in IReland and a conference coming up in DCU in September – http://www.clarity-centre.org/iHCI2010/ – you will find people there who might be potential supervisors.
Re PhD projects in UU – contact Darryl Charles to ask re entry requirements.
Aphra.