[IEEE 2019 16th International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD) - Lausanne, Switzerland (2019.7.15-2019.7.18)] 2019 16th International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD) - Charge-Based Model for Reliability Analysis Flow of Flip- Flops under Process Variation and Aging