cybernetics vs expert system

cybernetics

noun
  • Technology related to computers and Internet. 

  • The art/study of governing, controlling automatic processes and communication. 

  • The theory/science of communication and control in living organisms or machines. 

expert system

noun
  • A type of artificially intelligent software system, which stores expertise concerning some subject matter in a knowledge base and attempts to answer questions or solve problems in a manner which simulates the thought processes of a human expert. 

How often have the words cybernetics and expert system occurred in a corpus of books? (source: Google Ngram Viewer )