Jon has outlined these models in a bit more depth in Linkedin, and you may like to check out those posts there as well:
Beyond the Ulrich Model - Transformation of HR in the New People Centric Organisation.
Updating the Ulrich (conceptual/outcomes) Model - part 1
Updating the Ulrich (conceptual/outcomes) Model - part 2
Updating the Ulrich (physical/activities) Model
The Melded Network HR Model (HR Magazine Different Slant)
Functions in the New Melded Network HR Model