The optimum process mean setting is an efficient method for modern statistical process control. It can influence the production cost, the scrap cost, and the rework cost of production process. In this paper, we address the formulation of modified Chen and Chung's model with quadratic quality loss function. This notion is applied to determine the optimum process mean based on maximizing the expected profit per item. The modified Ladany and Shore's model with integrating quality and reliability is applied to determine the optimum expected lifetime and warranty period of product. This application is realized on the basis of maximizing the total expected profit.