Dislocation Density Function Dynamics (DDFD), created by Professor Alfonso Hing-wan Ngan (顏慶雲教授), is a highly efficient technique for simulating meso-scale microstructures. Matlab source code for dislocation plasticity simulation is available upon request or for download. Professor Ngan is a renowned expert in the microstructural basis of engineering material properties, specializing in crystalline defects, their modeling,