Kinematic hardening vs Isotropic Hardening

I am simulating plastic deformation with the plasticity vonMises Model. I am using 17-4 PH900 Stainless Steel with thefollowing properties.

Modulus of Elasticity, 197e3 MPa
Poisson's Ratio, .272
Density, 7800Kg/m^3
UTS, 1448MPa
.2% YS, 1379MPa


I want to estimate a elastoplastic model to explore the RESIDUALDEFORMATION. The model is similar to a beam but with a slightlyvarying cross section. The load is applied and then released.

I need to estimate what Cosmos calls RK which defines theproportion of kinematic and isotropic hardening. What is thedifference between isotropic hardening and kinematic hardening? Howdoes each effect the model? Cosmos's help file is over my head.
SolidworksSimulation