Norbert Wiener the amount of noise present in a signal by comparison with an estimate of the desired noiseless signal. Wiener developed the filter at the Radiation Laboratory at MIT to predict the position of German bombers from radar reflections. It is necessary to predict the future, because by the time the shell reaches the vicinity of the target, the target has moved, and maybe has changed direction slightly. They even modeled the muscle response of the pilot, which led eventually to cybernetics. The unmanned V1's were particularly easy to model, and on a good day, American guns fitted with Wiener filters
Advances in Complex Systems Advances in Complex Systems Advances in Complex Systems (ACS) is a peer-reviewed journal published quarterly by World Scientific providing a multidisciplinary perspective to the study of complex systems. The journal was founded in 1997 and aims to "promote cross-fertilization of ideas among all the scientific disciplines having to deal with their own complex systems". Papers in ACS are divided into five sections, each managed by a separate editor: Physics and Mathematics; Computer Sciences; Biological Systems; Social and Economic Systems; and Traffic and Environmental Systems. The journal is indexed in "Mathematical Reviews, CSA Human Population and the Environment Abstracts, CSA Risk