Which string method can I use to make sure that the phrase ‘invalid response’ only displays if the user has typed something other than ‘yes’ or ‘no’, without paying attention to their capitalization?

Abstract: Data-driven approaches can effectively quantify variations in the operational states of PV strings in solar PV systems. Multi-attribute decision-making methods’ feature weight values relying ...

Abstract: Aggregators of distributed energy resources are increasingly encouraged to participate in wholesale market bidding. However, the delivery of the power they are awarded can result in ...