I just learned about a new “surprisingly simple” way to fight cancer:
When we diagnose cancer, the treatment is still primarily surgical, commonly combined with radiation therapy and anticancer drugs. The aim of these treatments is to suppress, or arrest, the unrestrained growth of cells in the body organs or tissues. In the case of many man-made systems we are similarly faced with situations where processes deviate from the normal operation of the system. But the remedy for such deviations is surprisingly simple: negative feedback.
Hmm, feedback. I do hate cancer and I do love modern control theory! Tell me more!
Negative feedback means that the system’s output is fed back into the same system in order to enable the system to determine the difference between the actual and the desired output, and to make the necessary corrections in its own operation. For example a vehicle’s speed control uses the difference between the actual and the desired speed to adjust the fuel flow rate. Those systems which feed back their own output for self-regulation are said to be closed-loop control systems.
Yup, I get that. I use the cruise control all the time. (more…)
