內容介紹：A bioreactor is a device to provide a suitable environment supporting the growth of the microorganisms. It is widely used in various industrial processes, for example in biological wastewater treatment processes to reduce the substrate and in fermentation processes to produce pharmaceutical products such as insulin and penicillin. Differing from the conventional chemical reactors, performance of a bioreactor is very sensitive to the environment, such as a small change in pH or temperature can result in a noticeable change in yield, or a small unforeseen disturbance can cause a failure of the reactor, such as washout. Thus, there is strong economic incentive to design efficient ways to deal with these “noises”. In this work, I aim at investigating what roles the noises are playing in bioreactors, with the hope to provide some sound advices to develop proper control schemes.