This paper derives an iterative deadlock prevention policy for systems of simple sequential processes with resources (S3PRs) based on structural analysis. which consists of two stages. The first stage is called siphons control. Strict minimal siphons (SMSs) in an S3PR net are computed and control places are added by imposing P-invariants associated with the complementary sets of the S... https://cosmeticsolutioners.shop/product-category/nail-whitening-treatments/