For someone who knows; what are those studs or pins that are attached to the Q-Deck panels? How are they attached?
Those are shear studs, they are installed to secure the metal decking to the tops of the joists, trusses or steel beams.
They aid structural rigidity and allow greater mechanical attachment for the yet to be poured concrete.
Studs are attached with through-deck welding.
This type of structural system is called composite construction, with all the steel being in tension, excellent structural solution for long-span construction.