ENTRIES TAGGED "system"
Favoring behavior over environment
In a series of posts (Part 1, Part 2, Part 3, Part 4, Part 5, and Part 6), we have introduced the idea of feedback control as a way to keep complex systems on track, even when subject to uncertainty and change.
It is easy to be confused at this point, and to think that feedback is nothing more than an “adaptive system” that can modify its behavior in response to changes in its environment. But that would not be right. It depends on what quantity you are monitoring! A feedback system does not respond to changes in the environment—a feedback system changes specifically in response to changes in its own behavior. That’s a big difference.
Gracefully maintain a desired value in the presence of uncertainty and change
In a previous post, we introduced the basic feedback concept. Now it is time to take a closer look at this idea.
Feedback is a method to keep systems on track. In other words, feedback is a way to make sure a system behaves in the desired fashion. If we have some quality-of-service metric in mind, then feedback is a reliable method to ensure that our system will achieve and maintain the desired value of this metric, even in the presence of uncertainty and change.