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: Existing current signal-based open-circuit fault diagnosis methods necessitate real-time analysis of extensive historical current data for fault feature extraction, which leads to large ...